Initial build - GNU stow suitable for linking into your home dir using GNU stow

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.local/bin/chkstow Executable file
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#!/usr/bin/perl
use strict;
use warnings;
require 5.006_001;
use File::Find;
use Getopt::Long;
my $DEFAULT_TARGET = '/usr/local/';
our $Wanted = \&bad_links;
our %Package = ();
our $Stow_dir = '';
our $Target = $DEFAULT_TARGET;
# put the main loop into a block so that tests can load this as a module
if ( not caller() ) {
if (@ARGV == 0) {
usage();
}
process_options();
#check_stow($Target, $Wanted);
check_stow();
}
sub process_options {
GetOptions(
'b|badlinks' => sub { $Wanted = \&bad_links },
'a|aliens' => sub { $Wanted = \&aliens },
'l|list' => sub { $Wanted = \&list },
't|target=s' => \$Target,
) or usage();
return;
}
sub usage {
print <<"EOT";
USAGE: chkstow [options]
Options:
-t DIR, --target=DIR Set the target directory to DIR
(default is $DEFAULT_TARGET)
-b, --badlinks Report symlinks that point to non-existent files
-a, --aliens Report non-symlinks in the target directory
-l, --list List packages in the target directory
--badlinks is the default mode.
EOT
exit(0);
}
sub check_stow {
#my ($Target, $Wanted) = @_;
my (%options) = (
wanted => $Wanted,
preprocess => \&skip_dirs,
);
find(\%options, $Target);
if ($Wanted == \&list) {
delete $Package{''};
delete $Package{'..'};
if (keys %Package) {
print map "$_\n", sort(keys %Package);
}
}
return;
}
sub skip_dirs {
# skip stow source and unstowed targets
if (-e ".stow" || -e ".notstowed" ) {
warn "skipping $File::Find::dir\n";
return ();
}
else {
return @_;
}
}
# checking for files that do not link to anything
sub bad_links {
-l && !-e && print "Bogus link: $File::Find::name\n";
}
# checking for files that are not owned by stow
sub aliens {
!-l && !-d && print "Unstowed file: $File::Find::name\n";
}
# just list the packages in the the target directory
# FIXME: what if the stow dir is not called 'stow'?
sub list {
if (-l) {
$_ = readlink;
s{\A(?:\.\./)+stow/}{}g;
s{/.*}{}g;
$Package{$_} = 1;
}
}
1; # Hey, it's a module!
# Local variables:
# mode: perl
# cperl-indent-level: 4
# End:
# vim: ft=perl

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.local/bin/stow Executable file
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#!/usr/bin/perl
# GNU Stow - manage the installation of multiple software packages
# Copyright (C) 1993, 1994, 1995, 1996 by Bob Glickstein
# Copyright (C) 2000, 2001 Guillaume Morin
# Copyright (C) 2007 Kahlil Hodgson
# Copyright (C) 2011 Adam Spiers
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <http://www.gnu.org/licenses/>.
=head1 NAME
stow - software package installation manager
=head1 SYNOPSIS
stow [ options ] package ...
=head1 DESCRIPTION
This manual page describes GNU Stow 2.2.2, a program for managing
the installation of software packages. This is not the definitive
documentation for stow; for that, see the info manual.
Stow is a tool for managing the installation of multiple software
packages in the same run-time directory tree. One historical
difficulty of this task has been the need to administer, upgrade,
install, and remove files in independent packages without confusing
them with other files sharing the same filesystem space. For instance,
it is common to install Perl and Emacs in F</usr/local>. When one
does so, one winds up (as of Perl 4.036 and Emacs 19.22) with the
following files in F</usr/local/man/man1>: F<a2p.1>; F<ctags.1>;
F<emacs.1>; F<etags.1>; F<h2ph.1>; F<perl.1>; and F<s2p.1>. Now
suppose it's time to uninstall Perl. Which man pages get removed?
Obviously F<perl.1> is one of them, but it should not be the
administrator's responsibility to memorize the ownership of individual
files by separate packages.
The approach used by Stow is to install each package into its own
tree, then use symbolic links to make it appear as though the files
are installed in the common tree. Administration can be performed in
the package's private tree in isolation from clutter from other
packages. Stow can then be used to update the symbolic links. The
structure of each private tree should reflect the desired structure in
the common tree; i.e. (in the typical case) there should be a F<bin>
directory containing executables, a F<man/man1> directory containing
section 1 man pages, and so on.
Stow was inspired by Carnegie Mellon's Depot program, but is
substantially simpler and safer. Whereas Depot required database files
to keep things in sync, Stow stores no extra state between runs, so
there's no danger (as there was in Depot) of mangling directories when
file hierarchies don't match the database. Also unlike Depot, Stow
will never delete any files, directories, or links that appear in a
Stow directory (e.g., F</usr/local/stow/emacs>), so it's always
possible to rebuild the target tree (e.g., F</usr/local>).
=head1 TERMINOLOGY
A "package" is a related collection of files and directories that
you wish to administer as a unit -- e.g., Perl or Emacs -- and that
needs to be installed in a particular directory structure -- e.g.,
with F<bin>, F<lib>, and F<man> subdirectories.
A "target directory" is the root of a tree in which one or more
packages wish to B<appear> to be installed. A common, but by no means
the only such location is F</usr/local>. The examples in this manual
page will use F</usr/local> as the target directory.
A "stow directory" is the root of a tree containing separate
packages in private subtrees. When Stow runs, it uses the current
directory as the default stow directory. The examples in this manual
page will use F</usr/local/stow> as the stow directory, so that
individual packages will be, for example, F</usr/local/stow/perl> and
F</usr/local/stow/emacs>.
An "installation image" is the layout of files and directories
required by a package, relative to the target directory. Thus, the
installation image for Perl includes: a F<bin> directory containing
F<perl> and F<a2p> (among others); an F<info> directory containing
Texinfo documentation; a F<lib/perl> directory containing Perl
libraries; and a F<man/man1> directory containing man pages.
A "package directory" is the root of a tree containing the
installation image for a particular package. Each package directory
must reside in a stow directory -- e.g., the package directory
F</usr/local/stow/perl> must reside in the stow directory
F</usr/local/stow>. The "name" of a package is the name of its
directory within the stow directory -- e.g., F<perl>.
Thus, the Perl executable might reside in
F</usr/local/stow/perl/bin/perl>, where F</usr/local> is the target
directory, F</usr/local/stow> is the stow directory,
F</usr/local/stow/perl> is the package directory, and F<bin/perl>
within is part of the installation image.
A "symlink" is a symbolic link. A symlink can be "relative" or
"absolute". An absolute symlink names a full path; that is, one
starting from F</>. A relative symlink names a relative path; that
is, one not starting from F</>. The target of a relative symlink is
computed starting from the symlink's own directory. Stow only creates
relative symlinks.
=head1 OPTIONS
The stow directory is assumed to be the value of the C<STOW_DIR>
environment variable or if unset the current directory, and the target
directory is assumed to be the parent of the current directory (so it
is typical to execute F<stow> from the directory F</usr/local/stow>).
Each F<package> given on the command line is the name of a package in
the stow directory (e.g., F<perl>). By default, they are installed
into the target directory (but they can be deleted instead using
C<-D>).
=over 4
=item -n
=item --no
Do not perform any operations that modify the filesystem; merely show
what would happen.
=item -d DIR
=item --dir=DIR
Set the stow directory to C<DIR> instead of the current directory.
This also has the effect of making the default target directory be the
parent of C<DIR>.
=item -t DIR
=item --target=DIR
Set the target directory to C<DIR> instead of the parent of the stow
directory.
=item -v
=item --verbose[=N]
Send verbose output to standard error describing what Stow is
doing. Verbosity levels are 0, 1, 2, 3, and 4; 0 is the default.
Using C<-v> or C<--verbose> increases the verbosity by one; using
`--verbose=N' sets it to N.
=item -S
=item --stow
Stow the packages that follow this option into the target directory.
This is the default action and so can be omitted if you are only
stowing packages rather than performing a mixture of
stow/delete/restow actions.
=item -D
=item --delete
Unstow the packages that follow this option from the target directory rather
than installing them.
=item -R
=item --restow
Restow packages (first unstow, then stow again). This is useful
for pruning obsolete symlinks from the target tree after updating
the software in a package.
=item --adopt
B<Warning!> This behaviour is specifically intended to alter the
contents of your stow directory. If you do not want that, this option
is not for you.
When stowing, if a target is encountered which already exists but is a
plain file (and hence not owned by any existing stow package), then
normally Stow will register this as a conflict and refuse to proceed.
This option changes that behaviour so that the file is moved to the
same relative place within the package's installation image within the
stow directory, and then stowing proceeds as before. So effectively,
the file becomes adopted by the stow package, without its contents
changing.
=item --no-folding
Disable folding of newly stowed directories when stowing, and
refolding of newly foldable directories when unstowing.
=item --ignore=REGEX
Ignore files ending in this Perl regex.
=item --defer=REGEX
Don't stow files beginning with this Perl regex if the file is already
stowed to another package.
=item --override=REGEX
Force stowing files beginning with this Perl regex if the file is
already stowed to another package.
=item -V
=item --version
Show Stow version number, and exit.
=item -h
=item --help
Show Stow command syntax, and exit.
=back
=head1 INSTALLING PACKAGES
The default action of Stow is to install a package. This means
creating symlinks in the target tree that point into the package tree.
Stow attempts to do this with as few symlinks as possible; in other
words, if Stow can create a single symlink that points to an entire
subtree within the package tree, it will choose to do that rather than
create a directory in the target tree and populate it with symlinks.
For example, suppose that no packages have yet been installed in
F</usr/local>; it's completely empty (except for the F<stow>
subdirectory, of course). Now suppose the Perl package is installed.
Recall that it includes the following directories in its installation
image: F<bin>; F<info>; F<lib/perl>; F<man/man1>. Rather than
creating the directory F</usr/local/bin> and populating it with
symlinks to F<../stow/perl/bin/perl> and F<../stow/perl/bin/a2p> (and
so on), Stow will create a single symlink, F</usr/local/bin>, which
points to F<stow/perl/bin>. In this way, it still works to refer to
F</usr/local/bin/perl> and F</usr/local/bin/a2p>, and fewer symlinks
have been created. This is called "tree folding", since an entire
subtree is "folded" into a single symlink.
To complete this example, Stow will also create the symlink
F</usr/local/info> pointing to F<stow/perl/info>; the symlink
F</usr/local/lib> pointing to F<stow/perl/lib>; and the symlink
F</usr/local/man> pointing to F<stow/perl/man>.
Now suppose that instead of installing the Perl package into an empty
target tree, the target tree is not empty to begin with. Instead, it
contains several files and directories installed under a different
system-administration philosophy. In particular, F</usr/local/bin>
already exists and is a directory, as are F</usr/local/lib> and
F</usr/local/man/man1>. In this case, Stow will descend into
F</usr/local/bin> and create symlinks to F<../stow/perl/bin/perl> and
F<../stow/perl/bin/a2p> (etc.), and it will descend into
F</usr/local/lib> and create the tree-folding symlink F<perl> pointing
to F<../stow/perl/lib/perl>, and so on. As a rule, Stow only descends
as far as necessary into the target tree when it can create a
tree-folding symlink.
The time often comes when a tree-folding symlink has to be undone
because another package uses one or more of the folded subdirectories
in its installation image. This operation is called "splitting open"
a folded tree. It involves removing the original symlink from the
target tree, creating a true directory in its place, and then
populating the new directory with symlinks to the newly-installed
package B<and> to the old package that used the old symlink. For
example, suppose that after installing Perl into an empty
F</usr/local>, we wish to install Emacs. Emacs's installation image
includes a F<bin> directory containing the F<emacs> and F<etags>
executables, among others. Stow must make these files appear to be
installed in F</usr/local/bin>, but presently F</usr/local/bin> is a
symlink to F<stow/perl/bin>. Stow therefore takes the following
steps: the symlink F</usr/local/bin> is deleted; the directory
F</usr/local/bin> is created; links are made from F</usr/local/bin> to
F<../stow/emacs/bin/emacs> and F<../stow/emacs/bin/etags>; and links
are made from F</usr/local/bin> to F<../stow/perl/bin/perl> and
F<../stow/perl/bin/a2p>.
When splitting open a folded tree, Stow makes sure that the symlink
it is about to remove points inside a valid package in the current stow
directory.
=head2 Stow will never delete anything that it doesn't own.
Stow "owns" everything living in the target tree that points into a
package in the stow directory. Anything Stow owns, it can recompute if
lost. Note that by this definition, Stow doesn't "own" anything
B<in> the stow directory or in any of the packages.
If Stow needs to create a directory or a symlink in the target tree
and it cannot because that name is already in use and is not owned by
Stow, then a conflict has arisen. See the "Conflicts" section in the
info manual.
=head1 DELETING PACKAGES
When the C<-D> option is given, the action of Stow is to delete a
package from the target tree. Note that Stow will not delete anything
it doesn't "own". Deleting a package does B<not> mean removing it from
the stow directory or discarding the package tree.
To delete a package, Stow recursively scans the target tree, skipping
over the stow directory (since that is usually a subdirectory of the
target tree) and any other stow directories it encounters (see
"Multiple stow directories" in the info manual). Any symlink it
finds that points into the package being deleted is removed. Any
directory that contained only symlinks to the package being deleted is
removed. Any directory that, after removing symlinks and empty
subdirectories, contains only symlinks to a single other package, is
considered to be a previously "folded" tree that was "split open."
Stow will re-fold the tree by removing the symlinks to the surviving
package, removing the directory, then linking the directory back to
the surviving package.
=head1 SEE ALSO
The full documentation for F<stow> is maintained as a Texinfo manual.
If the F<info> and F<stow> programs are properly installed at your site, the command
info stow
should give you access to the complete manual.
=head1 BUGS
Please report bugs in Stow using the Debian bug tracking system.
Currently known bugs include:
=over 4
=item * The empty-directory problem.
If package F<foo> includes an empty directory -- say, F<foo/bar> --
then if no other package has a F<bar> subdirectory, everything's fine.
If another stowed package F<quux>, has a F<bar> subdirectory, then
when stowing, F<targetdir/bar> will be "split open" and the contents
of F<quux/bar> will be individually stowed. So far, so good. But when
unstowing F<quux>, F<targetdir/bar> will be removed, even though
F<foo/bar> needs it to remain. A workaround for this problem is to
create a file in F<foo/bar> as a placeholder. If you name that file
F<.placeholder>, it will be easy to find and remove such files when
this bug is fixed.
=item *
When using multiple stow directories (see "Multiple stow directories"
in the info manual), Stow fails to "split open" tree-folding symlinks
(see "Installing packages" in the info manual) that point into a stow
directory which is not the one in use by the current Stow
command. Before failing, it should search the target of the link to
see whether any element of the path contains a F<.stow> file. If it
finds one, it can "learn" about the cooperating stow directory to
short-circuit the F<.stow> search the next time it encounters a
tree-folding symlink.
=back
=head1 AUTHOR
This man page was originally constructed by Charles Briscoe-Smith from
parts of Stow's info manual, and then converted to POD format by Adam
Spiers. The info manual contains the following notice, which, as it
says, applies to this manual page, too. The text of the section
entitled "GNU General Public License" can be found in the file
F</usr/share/common-licenses/GPL> on any Debian GNU/Linux system. If
you don't have access to a Debian system, or the GPL is not there,
write to the Free Software Foundation, Inc., 59 Temple Place, Suite
330, Boston, MA, 02111-1307, USA.
=head1 COPYRIGHT
Copyright (C)
1993, 1994, 1995, 1996 by Bob Glickstein <bobg+stow@zanshin.com>;
2000, 2001 by Guillaume Morin;
2007 by Kahlil Hodgson;
2011 by Adam Spiers;
and others.
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided also that
the section entitled "GNU General Public License" is included with the
modified manual, and provided that the entire resulting derived work
is distributed under the terms of a permission notice identical to
this one.
Permission is granted to copy and distribute translations of this
manual into another language, under the above conditions for modified
versions, except that this permission notice may be stated in a
translation approved by the Free Software Foundation.
=cut
use strict;
use warnings;
require 5.006_001;
use POSIX qw(getcwd);
use Getopt::Long;
use Cwd qw(abs_path);
use File::Basename qw(dirname);
use lib dirname(dirname(abs_path($0))) . '/share/perl';
use Stow;
use Stow::Util qw(parent error);
my $ProgramName = $0;
$ProgramName =~ s{.*/}{};
main() unless caller();
sub main {
my ($options, $pkgs_to_unstow, $pkgs_to_stow) = process_options();
my $stow = new Stow(%$options);
# current dir is now the target directory
$stow->plan_unstow(@$pkgs_to_unstow);
$stow->plan_stow (@$pkgs_to_stow);
my %conflicts = $stow->get_conflicts;
if (%conflicts) {
foreach my $action ('unstow', 'stow') {
next unless $conflicts{$action};
foreach my $package (sort keys %{ $conflicts{$action} }) {
warn "WARNING! ${action}ing $package would cause conflicts:\n";
#if $stow->get_action_count > 1;
foreach my $message (sort @{ $conflicts{$action}{$package} }) {
warn " * $message\n";
}
}
}
warn "All operations aborted.\n";
exit 1;
}
else {
if ($options->{simulate}) {
warn "WARNING: in simulation mode so not modifying filesystem.\n";
return;
}
$stow->process_tasks();
}
}
#===== SUBROUTINE ===========================================================
# Name : process_options()
# Purpose : parse command line options
# Parameters: none
# Returns : (\%options, \@pkgs_to_unstow, \@pkgs_to_stow)
# Throws : a fatal error if a bad command line option is given
# Comments : checks @ARGV for valid package names
#============================================================================
sub process_options {
my %options = ();
my @pkgs_to_unstow = ();
my @pkgs_to_stow = ();
my $action = 'stow';
unshift @ARGV, get_config_file_options();
#$,="\n"; print @ARGV,"\n"; # for debugging rc file
Getopt::Long::config('no_ignore_case', 'bundling', 'permute');
GetOptions(
\%options,
'verbose|v:+', 'help|h', 'simulate|n|no',
'version|V', 'compat|p', 'dir|d=s', 'target|t=s',
'adopt', 'no-folding',
# clean and pre-compile any regex's at parse time
'ignore=s' =>
sub {
my $regex = $_[1];
push @{$options{ignore}}, qr($regex\z);
},
'override=s' =>
sub {
my $regex = $_[1];
push @{$options{override}}, qr(\A$regex);
},
'defer=s' =>
sub {
my $regex = $_[1];
push @{$options{defer}}, qr(\A$regex);
},
# a little craziness so we can do different actions on the same line:
# a -D, -S, or -R changes the action that will be performed on the
# package arguments that follow it.
'D|delete' => sub { $action = 'unstow' },
'S|stow' => sub { $action = 'stow' },
'R|restow' => sub { $action = 'restow' },
# Handler for non-option arguments
'<>' =>
sub {
if ($action eq 'restow') {
push @pkgs_to_unstow, $_[0];
push @pkgs_to_stow, $_[0];
}
elsif ($action eq 'unstow') {
push @pkgs_to_unstow, $_[0];
}
else {
push @pkgs_to_stow, $_[0];
}
},
) or usage();
usage() if $options{help};
version() if $options{version};
sanitize_path_options(\%options);
check_packages(\@pkgs_to_unstow, \@pkgs_to_stow);
return (\%options, \@pkgs_to_unstow, \@pkgs_to_stow);
}
sub sanitize_path_options {
my ($options) = @_;
if (exists $options->{dir}) {
$options->{dir} =~ s/\A +//;
$options->{dir} =~ s/ +\z//;
}
else {
$options->{dir} = exists $ENV{STOW_DIR} ? $ENV{STOW_DIR} : getcwd();
}
if (exists $options->{target}) {
$options->{target} =~ s/\A +//;
$options->{target} =~ s/ +\z//;
}
else {
$options->{target} = parent($options->{dir}) || '.';
}
}
sub check_packages {
my ($pkgs_to_stow, $pkgs_to_unstow) = @_;
if (not @$pkgs_to_stow and not @$pkgs_to_unstow) {
usage("No packages to stow or unstow");
}
# check package arguments
for my $package (@$pkgs_to_stow, @$pkgs_to_unstow) {
$package =~ s{/+$}{}; # delete trailing slashes
if ($package =~ m{/}) {
error("Slashes are not permitted in package names");
}
}
}
#===== SUBROUTINE ============================================================
# Name : get_config_file_options()
# Purpose : search for default settings in any .stowrc files
# Parameters: none
# Returns : a list of default options
# Throws : no exceptions
# Comments : prepends the contents of '~/.stowrc' and '.stowrc' to the command
# : line so they get parsed just like normal arguments. (This was
# : hacked in so that Emil and I could set different preferences).
#=============================================================================
sub get_config_file_options {
my @defaults = ();
for my $file ("$ENV{HOME}/.stowrc", '.stowrc') {
if (-r $file) {
warn "Loading defaults from $file\n";
open my $FILE, '<', $file
or die "Could not open $file for reading\n";
while (my $line = <$FILE>){
chomp $line;
push @defaults, split " ", $line;
}
close $FILE or die "Could not close open file: $file\n";
}
}
return @defaults;
}
#===== SUBROUTINE ===========================================================
# Name : usage()
# Purpose : print program usage message and exit
# Parameters: $msg => string to prepend to the usage message
# Returns : n/a
# Throws : n/a
# Comments : if 'msg' is given, then exit with non-zero status
#============================================================================
sub usage {
my ($msg) = @_;
if ($msg) {
print "$ProgramName: $msg\n\n";
}
print <<"EOT";
$ProgramName (GNU Stow) version $Stow::VERSION
SYNOPSIS:
$ProgramName [OPTION ...] [-D|-S|-R] PACKAGE ... [-D|-S|-R] PACKAGE ...
OPTIONS:
-d DIR, --dir=DIR Set stow dir to DIR (default is current dir)
-t DIR, --target=DIR Set target to DIR (default is parent of stow dir)
-S, --stow Stow the package names that follow this option
-D, --delete Unstow the package names that follow this option
-R, --restow Restow (like stow -D followed by stow -S)
--ignore=REGEX Ignore files ending in this Perl regex
--defer=REGEX Don't stow files beginning with this Perl regex
if the file is already stowed to another package
--override=REGEX Force stowing files beginning with this Perl regex
if the file is already stowed to another package
--adopt (Use with care!) Import existing files into stow package
from target. Please read docs before using.
-p, --compat Use legacy algorithm for unstowing
-n, --no, --simulate Do not actually make any filesystem changes
-v, --verbose[=N] Increase verbosity (levels are 0,1,2,3;
-v or --verbose adds 1; --verbose=N sets level)
-V, --version Show stow version number
-h, --help Show this help
Report bugs to: bug-stow\@gnu.org
Stow home page: <http://www.gnu.org/software/stow/>
General help using GNU software: <http://www.gnu.org/gethelp/>
EOT
exit defined $msg ? 1 : 0;
}
sub version {
print "$ProgramName (GNU Stow) version $Stow::VERSION\n";
exit 0;
}
1; # This file is required by t/stow.t
# Local variables:
# mode: perl
# cperl-indent-level: 4
# end:
# vim: ft=perl

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Thu Jan 31 2008 Kahlil Hodgson <kal@grebo.cs.rmit.edu.au>
* stow.texi: Austin Wood and Chris Hoobin clean this up for version 2.
* texi2man: new script by Austin and Chris to generate a man page from the
texinfo file.
Sun Nov 25 19:31:32 2007 Kahlil Hodgson <kahlil@internode.con.net>
* all: Version 2.0.1
* AUTHORS: added Kahlil Hodgson as a new author and current maintainer.
* stow.in: major rewrite to produce version 2.0.1 see NEWS for details
* t/: added test suite and support code
* configure.in: renamed to configure.ac as per autotools recommendation.
* configure.ac:
Use AC_INT rather than obsolete AM_INTI_MAKEFILE usage.
Remove redundant VERSION and PACKAGE setttings
Remove redundant AC_ARG_PROGRAM
Use AM_INIT_AUTOMAKE([-Wall -Werror]) because we are pedantic.
Add AC_PREREQ([2.6.1])
* Makefile.am, configure.ac:
Use explicit rewrite in Makefile.am, rather than AC_CONFIG_FILES(stow.in),
as per autotools recommendation.
* Makefile.am:
Add TESTS and TEST_ENVIRONMENT for files in t/
Use dist_man_MANS instead of EXTRA_DIST for man page
* INSTALL: update to reflect autotools modernization.
* NEWS: update to describe cahnges in Version 2.0.1.
* README: update to point to the right websites and email addresses.
* THANKS:
Add Emil Mikulc who's ideas largely inspired Version 2 and
and Geoffrey Giesemann who did some initial testing and found some
important bugs.
* TODO: remove tasks that where implemented in Version 2
* stow.texi: update documentation to reflect Version 2 changes.
* stow.8: update to reflect Version 2 changes.
Sat Jan 26 16:15:21 2002 Guillaume Morin <gmorin@gnu.org>
* stow.in: if $ENV{'STOW_DIR'} is set, this becomes the default
Stow directory.
Sun Jan 06 12:18:50 2002 Guillaume Morin <gmorin@gnu.org>
* Makefile.am: use EXTRA_DIST to include manpage in distribution
Wed Jan 02 21:33:41 2002 Guillaume Morin <gmorin@gnu.org>
* stow.in: Stow now only warns the user if a subdirectory
is unreadable during unstowing.
Wed Jan 02 20:58:05 2002 Guillaume Morin <gmorin@gnu.org>
* stow.in: fixed JoinPaths so that subdirs called "0" are
correctly pushed. Thanks a lot to Gergely Nagy
<algernon@bonehunter.rulez.org> who patiently helped me to chase
this bug.
Sun Dec 30 21:58:25 2001 Guillaume Morin <gmorin@gnu.org>
* stow.in: fixed a bug introduced by previous changes when
Target argument was relative. (thanks to Luca Filipozzi
<lfilipoz@debian.org> for pointing this out)
Sun Dec 30 18:23:25 2001 Guillaume Morin <gmorin@gnu.org>
* stow.in: now requires Perl 5. Use POSIX getcwd instead of broken
fastcwd. Fixed bug when CommonParent is /. Stow does not remove
initially empty directories anymore.
Sun Dec 30 18:07:51 2001 Guillaume Morin <gmorin@gnu.org>
* configure.in: automake fixes (fp_ -> AC, +AC_INIT_AUTOMAKE)
Fri Oct 11 22:09:45 1996 Bob Glickstein <bobg@hiro.zanshin.com>
* stow.html, configure.in: Version 1.3.2.
* README, stow.texi: Correct the URL again.
Fri Oct 11 18:20:42 1996 Bob Glickstein <bobg@hiro.zanshin.com>
* configure.in: Version 1.3.1.
* stow.html: Update Stow manual URL. Mention version 1.3.1.
* README: Update Stow URL.
* Makefile.am: stow-manual.html -> manual.html.
* stow.texi:
Add a reference to the Stow home page on the GNU web server. Change
several occurrences of "which" to "that" for grammatical superiority.
Wed Oct 9 00:34:07 1996 Bob Glickstein <bobg@hiro.zanshin.com>
* Makefile.am:
Add maintainer-only rules for stow-manual.html and stow-manual.texi.
Wed Oct 9 00:32:31 1996 Bob Glickstein <bobg@hiro.zanshin.com>
* README: Refer to the new location for the Stow home page.
* stow.html: Make it right for the GNU web server.
Tue Oct 8 21:54:09 1996 Bob Glickstein <bobg@hiro.zanshin.com>
* stow.texi: Document --restow
* stow.in: Add --restow (-R) option
* configure.in: Add "perl4" to search for Perl binary.
Bump version number to 1.3.
Mon Jun 24 23:23:03 1996 Bob Glickstein <bobg@hiro.zanshin.com>
* stow.texi: Delete trailing whitespace.
Fri Jun 21 19:44:26 1996 Bob Glickstein <bobg@hiro.zanshin.com>
* Makefile.am:
Don't explicitly mention version.texi. Automake now does it
automagically, by noticing the `@include version.texi' in
stow.texi. Awesome.
* stow.texi:
Use @include instead of @input. This is more Texinfoid, plus
allows Automake to automatically deduce the need for
version.texi.
* stow.in:
Elide trailing slashes from package names, then complain if
package names have slashes in them.
Tue Jun 18 23:19:04 1996 Bob Glickstein <bobg@hiro.zanshin.com>
* README: Call it "Gnu Stow".
Tue Jun 18 22:15:45 1996 Bob Glickstein <bobg@hiro.zanshin.com>
* configure.in:
Bump version number to 1.2.
Look for Perl under the names `perl' and `perl5'. If not found,
print a warning.
* stow.texi:
Add a section about bootstrapping. Add text about hacking Gnu
Make output.
* INSTALL:
Describe what happens when Perl isn't found during `configure'.
Mon Jun 17 19:43:25 1996 Bob Glickstein <bobg@hiro.zanshin.com>
* THANKS: Thank Fritz.
Fri Jun 14 19:18:50 1996 Bob Glickstein <bobg@hiro.zanshin.com>
* AUTHORS: Credit John Bazik and Gord Matzigkeit.
* stow.texi: Remove a "known bug" -- the pwd dependency is gone.
* stow.in:
Use fastcwd, from fastcwd.pl (which is GPL'd), to remove
dependency on an external pwd binary. Suggested by Gord
Matzigkeit.
* stow.in: Add a missing comma.
Thu Jun 13 21:52:10 1996 Bob Glickstein <bobg@hiro.zanshin.com>
* stow.in:
Change three occurrences of `my' to `local' for Perl 4
compatibility.
Thu Jun 13 18:07:37 1996 Bob Glickstein <bobg@hiro.zanshin.com>
* configure.in: Bump version number to 1.1.
* Makefile.am:
Add `stow' to the list of clean targets. Don't redirect output
directly into a make target.
* AUTHORS, README:
Use <bobg+stow@zanshin.com> as the contact address.
* TODO: New file.
* stow.in:
Refer to "Gnu Stow" in a few places. Use <bobg+stow@zanshin.com>
as the contact address. Handle long and short options. Handle
`version' and `help' options. Refer to "packages," not
"collections," for consistency with the manual.
* stow.texi:
Refer to "Gnu Stow" in a few places. Use <bobg+stow@zanshin.com>
as the contact address. Add sections on Reporting bugs and Known
bugs. Create a master menu. Minor rewording. Remove the period
from a node name.
* TODO, THANKS: New files.
Mon Jun 10 14:44:13 1996 Bob Glickstein <bobg@hiro.zanshin.com>
* NEWS: Create NEWS file for release. 1.0 now ready.
* stow.texi: Big revisions in preparation for release.
Sun Jun 9 15:47:19 1996 Bob Glickstein <bobg@zoger.ipost.com>
* stow.in: Enhance argument parsing, losing Perl 4 support in the
process.
(later) Perl 4 support restored.
Fri Jun 7 12:13:33 1996 Bob Glickstein <bobg@hiro.zanshin.com>
* Created stow, formerly "depot."

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README for GNU Stow
===================
This is GNU Stow, a symlink farm manager program which takes distinct
packages of software and/or data located in separate directories on
the filesystem, and makes them appear to be installed in the same
place. For example, /usr/local/bin could contain symlinks to files
within /usr/local/stow/emacs/bin, /usr/local/stow/perl/bin etc., and
likewise recursively for any other subdirectories such as .../share,
.../man, and so on.
This is particularly useful for keeping track of system-wide and
per-user installations of software built from source, but can also
facilitate a more controlled approach to management of configuration
files in the user's home directory, especially when coupled with
version control systems.
Stow is implemented as a combination of a Perl script providing a CLI
interface, and a backend Perl module which does most of the work.
You can get the latest information about Stow from the home page:
http://www.gnu.org/software/stow/
License
-------
Stow is free software, licensed under the GNU General Public License,
which can be found in the file COPYING.
Installation
------------
See INSTALL for installation instructions.
Feedback
--------
Please do send comments, questions, and constructive criticism. The
mailing lists and any other communication channels are detailed on the
above home page.
Brief history
-------------
Stow was inspired by Carnegie Mellon's "Depot" program, but is
substantially simpler. Whereas Depot requires database files to keep
things in sync, Stow stores no extra state between runs, so there's no
danger (as there is in Depot) of mangling directories when file
hierarchies don't match the database. Also unlike Depot, Stow will
never delete any files, directories, or links that appear in a Stow
directory (e.g., /usr/local/stow/emacs), so it's always possible to
rebuild the target tree (e.g., /usr/local).

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<a name="Bootstrapping"></a>
<p>
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Previous:&nbsp;<a rel="previous" accesskey="p" href="Compile_002dtime-vs-Install_002dtime.html#Compile_002dtime-vs-Install_002dtime">Compile-time vs Install-time</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="index.html#Top">Top</a>
<hr>
</div>
<h2 class="chapter">13 Bootstrapping</h2>
<p>Suppose you have a stow directory all set up and ready to go:
<samp><span class="file">/usr/local/stow/perl</span></samp> contains the Perl installation,
<samp><span class="file">/usr/local/stow/stow</span></samp> contains Stow itself, and perhaps you have
other packages waiting to be stowed. You'd like to be able to do this:
<pre class="example"> cd /usr/local/stow
stow -vv *
</pre>
<p class="noindent">but <samp><span class="command">stow</span></samp> is not yet in your <samp><span class="env">PATH</span></samp>. Nor can you do this:
<pre class="example"> cd /usr/local/stow
stow/bin/stow -vv *
</pre>
<p class="noindent">because the &lsquo;<samp><span class="samp">#!</span></samp>&rsquo; line at the beginning of <samp><span class="command">stow</span></samp> tries to
locate Perl (usually in <samp><span class="file">/usr/local/bin/perl</span></samp>), and that won't be
found. The solution you must use is:
<pre class="example"> cd /usr/local/stow
perl/bin/perl stow/bin/stow -vv *
</pre>
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Software and documentation is copyrighted by the following:
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(C) 2000, 2001 Guillaume Morin <gmorin@gnu.org>
(C) 2007 Kahlil (Kal) Hodgson <kahlil@internode.on.net>
(C) 2011 Adam Spiers <stow@adamspiers.org>
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<a name="Compile_002dtime-vs-Install_002dtime"></a>
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Previous:&nbsp;<a rel="previous" accesskey="p" href="Resource-Files.html#Resource-Files">Resource Files</a>,
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<hr>
</div>
<h2 class="chapter">12 Compile-time vs Install-time</h2>
<p>Software whose installation is managed with Stow needs to be installed
in one place (the package directory, e.g. <samp><span class="file">/usr/local/stow/perl</span></samp>)
but needs to appear to run in another place (the target tree, e.g.,
<samp><span class="file">/usr/local</span></samp>). Why is this important? What's wrong with Perl, for
instance, looking for its files in <samp><span class="file">/usr/local/stow/perl</span></samp> instead
of in <samp><span class="file">/usr/local</span></samp>?
<p>The answer is that there may be another package, e.g.,
<samp><span class="file">/usr/local/stow/perl-extras</span></samp>, stowed under <samp><span class="file">/usr/local</span></samp>. If
Perl is configured to find its files in <samp><span class="file">/usr/local/stow/perl</span></samp>, it
will never find the extra files in the &lsquo;<samp><span class="samp">perl-extras</span></samp>&rsquo; package, even
though they're intended to be found by Perl. On the other hand, if Perl
looks for its files in <samp><span class="file">/usr/local</span></samp>, then it will find the
intermingled Perl and &lsquo;<samp><span class="samp">perl-extras</span></samp>&rsquo; files.
<p>This means that when you compile a package, you must tell it the
location of the run-time, or target tree; but when you install it, you
must place it in the stow tree.
<h3 class="section">12.1 Advice on changing compilation and installation parameters</h3>
<p>Some software packages allow you to specify, at compile-time, separate
locations for installation and for run-time. Perl is one such package;
see <a href="Perl-and-Perl-5-Modules.html#Perl-and-Perl-5-Modules">Perl and Perl 5 Modules</a>. Others allow you to compile the
package, then give a different destination in the &lsquo;<samp><span class="samp">make install</span></samp>&rsquo;
step without causing the binaries or other files to get rebuilt. Most
GNU software falls into this category; Emacs is a notable exception.
See <a href="GNU-Emacs.html#GNU-Emacs">GNU Emacs</a>, and <a href="Other-FSF-Software.html#Other-FSF-Software">Other FSF Software</a>.
<p>Still other software packages cannot abide the idea of separate
installation and run-time locations at all. If you try to &lsquo;<samp><span class="samp">make
install prefix=/usr/local/stow/</span><var>foo</var></samp>&rsquo;, then first the whole package
will be recompiled to hardwire the <samp><span class="file">/usr/local/stow/</span><var>foo</var></samp>
path. With these packages, it is best to compile normally, then run
&lsquo;<samp><span class="samp">make -n install</span></samp>&rsquo;, which should report all the steps needed to
install the just-built software. Place this output into a file, edit
the commands in the file to remove recompilation steps and to reflect
the Stow-based installation location, and execute the edited file as a
shell script in place of &lsquo;<samp><span class="samp">make install</span></samp>&rsquo;. Be sure to execute the
script using the same shell that &lsquo;<samp><span class="samp">make install</span></samp>&rsquo; would have used.
<p>(If you use GNU Make and a shell [such as GNU bash] that understands
<samp><span class="command">pushd</span></samp> and <samp><span class="command">popd</span></samp>, you can do the following:
<ol type=1 start=1>
<li>Replace all lines matching &lsquo;<samp><span class="samp">make[</span><var>n</var><span class="samp">]: Entering directory
</span><var>dir</var></samp>&rsquo; with &lsquo;<samp><span class="samp">pushd </span><var>dir</var></samp>&rsquo;.
<li>Replace all lines matching &lsquo;<samp><span class="samp">make[</span><var>n</var><span class="samp">]: Leaving directory
</span><var>dir</var></samp>&rsquo; with &lsquo;<samp><span class="samp">popd</span></samp>&rsquo;.
<li>Delete all lines matching &lsquo;<samp><span class="samp">make[</span><var>n</var><span class="samp">]: Nothing to be done for
</span><var>rule</var></samp>&rsquo;.
</ol>
<p>Then find other lines in the output containing <samp><span class="command">cd</span></samp> or <samp><span class="command">make</span></samp>
commands and rewrite or delete them. In particular, you should be able
to delete sections of the script that resemble this:
<pre class="example"> for i in <var>dir_1</var> <var>dir_2</var> <span class="roman">...</span>; do \
(cd $i; make <var>args</var> <span class="roman">...</span>) \
done
</pre>
<p class="noindent">Note, that's &ldquo;should be able to,&rdquo; not &ldquo;can.&rdquo; Be sure to modulate
these guidelines with plenty of your own intelligence.
<p>The details of stowing some specific packages are described in the
following sections.
<ul class="menu">
<li><a accesskey="1" href="GNU-Emacs.html#GNU-Emacs">GNU Emacs</a>
<li><a accesskey="2" href="Other-FSF-Software.html#Other-FSF-Software">Other FSF Software</a>
<li><a accesskey="3" href="Cygnus-Software.html#Cygnus-Software">Cygnus Software</a>
<li><a accesskey="4" href="Perl-and-Perl-5-Modules.html#Perl-and-Perl-5-Modules">Perl and Perl 5 Modules</a>
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Software and documentation is copyrighted by the following:
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(C) 2000, 2001 Guillaume Morin <gmorin@gnu.org>
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<h2 class="chapter">7 Conflicts</h2>
<p><a name="index-conflicts-31"></a>If, during installation, a file or symlink exists in the target tree and
has the same name as something Stow needs to create, and if the
existing name is not a folded tree that can be split open, then a
<dfn>conflict</dfn> has arisen. A conflict also occurs if a directory exists
where Stow needs to place a symlink to a non-directory. On the
other hand, if the existing name is merely a symlink that already points
where Stow needs it to, then no conflict has occurred. (Thus it
is harmless to install a package that has already been installed.)
<p>For complex packages, scanning the stow and target trees in tandem,
and deciding whether to make directories or links, split-open or fold
directories, can actually take a long time (a number of seconds).
Moreover, an accurate analysis of potential conflicts requires us to
take into account all of these operations.
<p><a name="Deferred-Operation"></a>
<h3 class="section">7.1 Deferred Operation</h3>
<p><a name="index-deferred-operation-32"></a>
Since version 2.0, Stow now adopts a two-phase algorithm, first
scanning for any potential conflicts before any stowing or unstowing
operations are performed. If any conflicts are found, they are
displayed and then Stow terminates without making any modifications to
the filesystem. This means that there is much less risk of a package
being partially stowed or unstowed due to conflicts.
<p>Prior to version 2.0, if a conflict was discovered, the stow or unstow
operation could be aborted mid-flow, leaving the target tree in an
inconsistent state.
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<p>
Next:&nbsp;<a rel="next" accesskey="n" href="Perl-and-Perl-5-Modules.html#Perl-and-Perl-5-Modules">Perl and Perl 5 Modules</a>,
Previous:&nbsp;<a rel="previous" accesskey="p" href="Other-FSF-Software.html#Other-FSF-Software">Other FSF Software</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="Compile_002dtime-vs-Install_002dtime.html#Compile_002dtime-vs-Install_002dtime">Compile-time vs Install-time</a>
<hr>
</div>
<h3 class="section">12.4 Cygnus Software</h3>
<p>Cygnus is a commercial supplier and supporter of GNU software. It has
also written several of its own packages, released under the terms of
the GNU General Public License; and it has taken over the maintenance of
other packages. Among the packages released by Cygnus are &lsquo;<samp><span class="samp">gdb</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">gnats</span></samp>&rsquo;, and &lsquo;<samp><span class="samp">dejagnu</span></samp>&rsquo;.
<p>Cygnus packages have the peculiarity that each one unpacks into a
directory tree with a generic top-level Makefile, which is set up to
compile <em>all</em> of Cygnus' packages, any number of which may reside
under the top-level directory. In other words, even if you're only
building &lsquo;<samp><span class="samp">gnats</span></samp>&rsquo;, the top-level Makefile will look for, and try to
build, <samp><span class="file">gdb</span></samp> and <samp><span class="file">dejagnu</span></samp> subdirectories, among many others.
<p>The result is that if you try &lsquo;<samp><span class="samp">make -n install
prefix=/usr/local/stow/</span><var>package</var></samp>&rsquo; at the top level of a Cygnus
package, you'll get a bewildering amount of output. It will then be
very difficult to visually scan the output to see whether the install
will proceed correctly. Unfortunately, it's not always clear how to
invoke an install from the subdirectory of interest.
<p>In cases like this, the best approach is to run your &lsquo;<samp><span class="samp">make install
prefix=...</span></samp>&rsquo;, but be ready to interrupt it if you detect that it
is recompiling files. Usually it will work just fine; otherwise,
install manually.
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<hr>
</div>
<h2 class="chapter">6 Deleting Packages</h2>
<p><a name="index-deletion-28"></a>When the <samp><span class="option">-D</span></samp> option is given, the action of Stow is to
delete a package from the target tree. Note that Stow will not
delete anything it doesn't &ldquo;own&rdquo;. Deleting a package does <em>not</em>
mean removing it from the stow directory or discarding the package
tree.
<p>To delete a package, Stow recursively scans the target tree, skipping over any
directory that is not included in the installation image.<a rel="footnote" href="#fn-1" name="fnd-1"><sup>1</sup></a>
For example, if the target directory is <samp><span class="file">/usr/local</span></samp> and the
installation image for the package being deleted has only a <samp><span class="file">bin</span></samp>
directory and a <samp><span class="file">man</span></samp> directory at the top level, then we only scan
<samp><span class="file">/usr/local/bin</span></samp> and <samp><span class="file">/usr/local/bin/man</span></samp>, and not
<samp><span class="file">/usr/local/lib</span></samp> or <samp><span class="file">/usr/local/share</span></samp>, or for that matter
<samp><span class="file">/usr/local/stow</span></samp>. Any symlink it finds that points into the package
being deleted is removed. Any directory that contained only symlinks to the
package being deleted is removed.
<p><a name="tree-refolding"></a>
<h3 class="section">6.1 Refolding &ldquo;foldable&rdquo; trees.</h3>
<p><a name="index-refolding-trees-29"></a><a name="index-tree-refolding-30"></a>
After removing symlinks and empty subdirectories, any directory that
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the tree by removing the symlinks to the surviving package, removing
the directory, then linking the directory back to the surviving
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<!-- =========================================================================== -->
<div class="footnote">
<hr>
<h4>Footnotes</h4><p class="footnote"><small>[<a name="fn-1" href="#fnd-1">1</a>]</small> This
approach was introduced in version 2 of GNU Stow. Previously, the whole
target tree was scanned and stow directories were explicitly omitted. This
became problematic when dealing with very large installations. The only
situation where this is useful is if you accidentally delete a directory in
the package tree, leaving you with a whole bunch of dangling links. Note that
you can enable the old approach with the <samp><span class="option">-p</span></samp> option. Alternatively, you can
use the <samp><span class="option">--badlinks</span></samp> option get stow to search for dangling links in your target tree and remove the offenders manually.</p>
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included with the modified manual, and provided that the entire
resulting derived work is distributed under the terms of a
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<p>
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Previous:&nbsp;<a rel="previous" accesskey="p" href="Compile_002dtime-vs-Install_002dtime.html#Compile_002dtime-vs-Install_002dtime">Compile-time vs Install-time</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="Compile_002dtime-vs-Install_002dtime.html#Compile_002dtime-vs-Install_002dtime">Compile-time vs Install-time</a>
<hr>
</div>
<h3 class="section">12.2 GNU Emacs</h3>
<p>Although the Free Software Foundation has many enlightened practices
regarding Makefiles and software installation (see see <a href="Other-FSF-Software.html#Other-FSF-Software">Other FSF Software</a>), Emacs, its flagship program, doesn't quite follow the
rules. In particular, most GNU software allows you to write:
<pre class="example"> make
make install prefix=/usr/local/stow/<var>package</var>
</pre>
<p class="noindent">If you try this with Emacs, then the new value for <var>prefix</var> in the
&lsquo;<samp><span class="samp">make install</span></samp>&rsquo; step will cause some files to get recompiled with
the new value of <var>prefix</var> wired into them. In Emacs 19.23 and
later,<a rel="footnote" href="#fn-1" name="fnd-1"><sup>1</sup></a>
the way to work around this problem is:
<pre class="example"> make
make install-arch-dep install-arch-indep prefix=/usr/local/stow/emacs
</pre>
<p>In 19.22 and some prior versions of Emacs, the workaround was:
<pre class="example"> make
make do-install prefix=/usr/local/stow/emacs
</pre>
<!-- -->
<div class="footnote">
<hr>
<h4>Footnotes</h4><p class="footnote"><small>[<a name="fn-1" href="#fnd-1">1</a>]</small> As I write this, the current version of Emacs is 19.31.</p>
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<h2 class="unnumbered">GNU General Public License</h2>
<div align="center">Version 2, June 1991</div>
<pre class="display"> Copyright &copy; 1989, 1991 Free Software Foundation, Inc.
675 Mass Ave, Cambridge, MA 02139, USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
</pre>
<h3 class="unnumberedsec">Preamble</h3>
<p>The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software&mdash;to make sure the software is free for all its users. This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it. (Some other Free Software Foundation software is covered by
the GNU Library General Public License instead.) You can apply it to
your programs, too.
<p>When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.
<p>To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if you
distribute copies of the software, or if you modify it.
<p>For example, if you distribute copies of such a program, whether
gratis or for a fee, you must give the recipients all the rights that
you have. You must make sure that they, too, receive or can get the
source code. And you must show them these terms so they know their
rights.
<p>We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
distribute and/or modify the software.
<p>Also, for each author's protection and ours, we want to make certain
that everyone understands that there is no warranty for this free
software. If the software is modified by someone else and passed on, we
want its recipients to know that what they have is not the original, so
that any problems introduced by others will not reflect on the original
authors' reputations.
<p>Finally, any free program is threatened constantly by software
patents. We wish to avoid the danger that redistributors of a free
program will individually obtain patent licenses, in effect making the
program proprietary. To prevent this, we have made it clear that any
patent must be licensed for everyone's free use or not licensed at all.
<p>The precise terms and conditions for copying, distribution and
modification follow.
<ol type=1 start=0>
<li>This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License. The &ldquo;Program&rdquo;, below,
refers to any such program or work, and a &ldquo;work based on the Program&rdquo;
means either the Program or any derivative work under copyright law:
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the term &ldquo;modification&rdquo;.) Each licensee is addressed as &ldquo;you&rdquo;.
<p>Activities other than copying, distribution and modification are not
covered by this License; they are outside its scope. The act of
running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.
<li>You may copy and distribute verbatim copies of the Program's
source code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the
notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
along with the Program.
<p>You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.
<li>You may modify your copy or copies of the Program or any portion
of it, thus forming a work based on the Program, and copy and
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above, provided that you also meet all of these conditions:
<ol type=a start=1>
<li>You must cause the modified files to carry prominent notices
stating that you changed the files and the date of any change.
<li>You must cause any work that you distribute or publish, that in
whole or in part contains or is derived from the Program or any
part thereof, to be licensed as a whole at no charge to all third
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<li>If the modified program normally reads commands interactively
when run, you must cause it, when started running for such
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announcement including an appropriate copyright notice and a
notice that there is no warranty (or else, saying that you provide
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</ol>
<p>These requirements apply to the modified work as a whole. If
identifiable sections of that work are not derived from the Program,
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<p>Thus, it is not the intent of this section to claim rights or contest
your rights to work written entirely by you; rather, the intent is to
exercise the right to control the distribution of derivative or
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<p>In addition, mere aggregation of another work not based on the Program
with the Program (or with a work based on the Program) on a volume of
a storage or distribution medium does not bring the other work under
the scope of this License.
<li>You may copy and distribute the Program (or a work based on it,
under Section 2) in object code or executable form under the terms of
Sections 1 and 2 above provided that you also do one of the following:
<ol type=a start=1>
<li>Accompany it with the complete corresponding machine-readable
source code, which must be distributed under the terms of Sections
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<li>Accompany it with a written offer, valid for at least three
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customarily used for software interchange; or,
<li>Accompany it with the information you received as to the offer
to distribute corresponding source code. (This alternative is
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infringement or for any other reason (not limited to patent issues),
conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot
distribute so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you
may not distribute the Program at all. For example, if a patent
license would not permit royalty-free redistribution of the Program by
all those who receive copies directly or indirectly through you, then
the only way you could satisfy both it and this License would be to
refrain entirely from distribution of the Program.
<p>If any portion of this section is held invalid or unenforceable under
any particular circumstance, the balance of the section is intended to
apply and the section as a whole is intended to apply in other
circumstances.
<p>It is not the purpose of this section to induce you to infringe any
patents or other property right claims or to contest validity of any
such claims; this section has the sole purpose of protecting the
integrity of the free software distribution system, which is
implemented by public license practices. Many people have made
generous contributions to the wide range of software distributed
through that system in reliance on consistent application of that
system; it is up to the author/donor to decide if he or she is willing
to distribute software through any other system and a licensee cannot
impose that choice.
<p>This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.
<li>If the distribution and/or use of the Program is restricted in
certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Program under this License
may add an explicit geographical distribution limitation excluding
those countries, so that distribution is permitted only in or among
countries not thus excluded. In such case, this License incorporates
the limitation as if written in the body of this License.
<li>The Free Software Foundation may publish revised and/or new versions
of the General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
<p>Each version is given a distinguishing version number. If the Program
specifies a version number of this License which applies to it and &ldquo;any
later version&rdquo;, you have the option of following the terms and conditions
either of that version or of any later version published by the Free
Software Foundation. If the Program does not specify a version number of
this License, you may choose any version ever published by the Free Software
Foundation.
<li>If you wish to incorporate parts of the Program into other free
programs whose distribution conditions are different, write to the author
to ask for permission. For software which is copyrighted by the Free
Software Foundation, write to the Free Software Foundation; we sometimes
make exceptions for this. Our decision will be guided by the two goals
of preserving the free status of all derivatives of our free software and
of promoting the sharing and reuse of software generally.
<li>BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM &ldquo;AS IS&rdquo; WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.
<li>IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
</ol>
<h3 class="unnumberedsec">How to Apply These Terms to Your New Programs</h3>
<p>If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
<p>To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the &ldquo;copyright&rdquo; line and a pointer to where the full notice is found.
<pre class="smallexample"> <var>one line to give the program's name and an idea of what it does.</var>
Copyright (C) 19<var>yy</var> <var>name of author</var>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
</pre>
<p>Also add information on how to contact you by electronic and paper mail.
<p>If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:
<pre class="smallexample"> Gnomovision version 69, Copyright (C) 19<var>yy</var> <var>name of author</var>
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
type `show w'. This is free software, and you are welcome
to redistribute it under certain conditions; type `show c'
for details.
</pre>
<p>The hypothetical commands &lsquo;<samp><span class="samp">show w</span></samp>&rsquo; and &lsquo;<samp><span class="samp">show c</span></samp>&rsquo; should show
the appropriate parts of the General Public License. Of course, the
commands you use may be called something other than &lsquo;<samp><span class="samp">show w</span></samp>&rsquo; and
&lsquo;<samp><span class="samp">show c</span></samp>&rsquo;; they could even be mouse-clicks or menu items&mdash;whatever
suits your program.
<p>You should also get your employer (if you work as a programmer) or your
school, if any, to sign a &ldquo;copyright disclaimer&rdquo; for the program, if
necessary. Here is a sample; alter the names:
<pre class="smallexample"> Yoyodyne, Inc., hereby disclaims all copyright
interest in the program `Gnomovision'
(which makes passes at compilers) written
by James Hacker.
<var>signature of Ty Coon</var>, 1 April 1989
Ty Coon, President of Vice
</pre>
<p>This General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications
with the library. If this is what you want to do, use the GNU Library
General Public License instead of this License.
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<h2 class="chapter">5 Installing Packages</h2>
<p><a name="index-installation-17"></a>The default action of Stow is to install a package. This means creating
symlinks in the target tree that point into the package tree. Stow
attempts to do this with as few symlinks as possible; in other words, if
Stow can create a single symlink that points to an entire subtree within
the package tree, it will choose to do that rather than create a
directory in the target tree and populate it with symlinks.
<p><a name="tree-folding"></a>
<h3 class="section">5.1 Tree folding</h3>
<p><a name="index-tree-folding-18"></a><a name="index-directory-folding-19"></a><a name="index-folding-trees-20"></a>For example, suppose that no packages have yet been installed in
<samp><span class="file">/usr/local</span></samp>; it's completely empty (except for the <samp><span class="file">stow</span></samp>
subdirectory, of course). Now suppose the Perl package is installed.
Recall that it includes the following directories in its installation
image: <samp><span class="file">bin</span></samp>; <samp><span class="file">info</span></samp>; <samp><span class="file">lib/perl</span></samp>; <samp><span class="file">man/man1</span></samp>.
Rather than creating the directory <samp><span class="file">/usr/local/bin</span></samp> and populating
it with symlinks to <samp><span class="file">../stow/perl/bin/perl</span></samp> and
<samp><span class="file">../stow/perl/bin/a2p</span></samp> (and so on), Stow will create a
single symlink, <samp><span class="file">/usr/local/bin</span></samp>, which points to
<samp><span class="file">stow/perl/bin</span></samp>. In this way, it still works to refer to
<samp><span class="file">/usr/local/bin/perl</span></samp> and <samp><span class="file">/usr/local/bin/a2p</span></samp>, and fewer
symlinks have been created. This is called <dfn>tree folding</dfn>, since an
entire subtree is &ldquo;folded&rdquo; into a single symlink.
<p>To complete this example, Stow will also create the symlink
<samp><span class="file">/usr/local/info</span></samp> pointing to <samp><span class="file">stow/perl/info</span></samp>; the symlink
<samp><span class="file">/usr/local/lib</span></samp> pointing to <samp><span class="file">stow/perl/lib</span></samp>; and the symlink
<samp><span class="file">/usr/local/man</span></samp> pointing to <samp><span class="file">stow/perl/man</span></samp>.
<p>Now suppose that instead of installing the Perl package into an empty
target tree, the target tree is not empty to begin with. Instead, it
contains several files and directories installed under a different
system-administration philosophy. In particular, <samp><span class="file">/usr/local/bin</span></samp>
already exists and is a directory, as are <samp><span class="file">/usr/local/lib</span></samp> and
<samp><span class="file">/usr/local/man/man1</span></samp>. In this case, Stow will descend into
<samp><span class="file">/usr/local/bin</span></samp> and create symlinks to
<samp><span class="file">../stow/perl/bin/perl</span></samp> and <samp><span class="file">../stow/perl/bin/a2p</span></samp> (etc.),
and it will descend into <samp><span class="file">/usr/local/lib</span></samp> and create the
tree-folding symlink <samp><span class="file">perl</span></samp> pointing to
<samp><span class="file">../stow/perl/lib/perl</span></samp>, and so on. As a rule, Stow only
descends as far as necessary into the target tree when it can create a
tree-folding symlink. However, this behaviour can be changed via
the <samp><span class="option">--no-folding</span></samp> option; see <a href="Invoking-Stow.html#Invoking-Stow">Invoking Stow</a>.
<p><a name="Tree-unfolding"></a>
<h3 class="section">5.2 Tree unfolding</h3>
<p><a name="index-splitting-open-folded-trees-21"></a><a name="index-unfolding-trees-22"></a><a name="index-tree-unfolding-23"></a><a name="index-tree-unsplitting-24"></a>The time often comes when a tree-folding symlink has to be undone
because another package uses one or more of the folded subdirectories in
its installation image. This operation is called <dfn>splitting open</dfn> or
<dfn>unfolding</dfn> a folded tree. It involves removing the original symlink from
the target tree, creating a true directory in its place, and then populating the
new directory with symlinks to the newly-installed package <em>and</em> to
the old package that used the old symlink. For example, suppose that
after installing Perl into an empty <samp><span class="file">/usr/local</span></samp>, we wish to
install Emacs. Emacs's installation image includes a <samp><span class="file">bin</span></samp>
directory containing the <samp><span class="file">emacs</span></samp> and <samp><span class="file">etags</span></samp> executables,
among others. Stow must make these files appear to be installed
in <samp><span class="file">/usr/local/bin</span></samp>, but presently <samp><span class="file">/usr/local/bin</span></samp> is a
symlink to <samp><span class="file">stow/perl/bin</span></samp>. Stow therefore takes the
following steps: the symlink <samp><span class="file">/usr/local/bin</span></samp> is deleted; the
directory <samp><span class="file">/usr/local/bin</span></samp> is created; links are made from
<samp><span class="file">/usr/local/bin</span></samp> to <samp><span class="file">../stow/emacs/bin/emacs</span></samp> and
<samp><span class="file">../stow/emacs/bin/etags</span></samp>; and links are made from
<samp><span class="file">/usr/local/bin</span></samp> to <samp><span class="file">../stow/perl/bin/perl</span></samp> and
<samp><span class="file">../stow/perl/bin/a2p</span></samp>.
<h3 class="section">5.3 Ownership</h3>
<p><a name="index-ownership-25"></a>When splitting open a folded tree, Stow makes sure that the
symlink it is about to remove points inside a valid package in the
current stow directory. <em>Stow will never delete anything
that it doesn't own</em>. Stow &ldquo;owns&rdquo; everything living in the
target tree that points into a package in the stow directory. Anything
Stow owns, it can recompute if lost: symlinks that point into a package in
the stow directory, or directories that only contain symlinks that stow
&ldquo;owns&rdquo;. Note that by this definition, Stow doesn't &ldquo;own&rdquo; anything
<em>in</em> the stow directory or in any of the packages.
<h3 class="section">5.4 Conflicts during installation</h3>
<p><a name="index-conflicts-26"></a><a name="index-installation-conflicts-27"></a>If Stow needs to create a directory or a symlink in the target
tree and it cannot because that name is already in use and is not owned
by Stow, then a <dfn>conflict</dfn> has arisen. See <a href="Conflicts.html#Conflicts">Conflicts</a>.
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<h2 class="chapter">1 Introduction</h2>
<p>Stow is a tool for managing the installation of multiple software
packages in the same run-time directory tree. One historical difficulty
of this task has been the need to administer, upgrade, install, and
remove files in independent packages without confusing them with other
files sharing the same file system space. For instance, it is common to
install Perl and Emacs in <samp><span class="file">/usr/local</span></samp>. When one does so, one
winds up with the following files<a rel="footnote" href="#fn-1" name="fnd-1"><sup>1</sup></a> in <samp><span class="file">/usr/local/man/man1</span></samp>:
<pre class="example"> a2p.1
ctags.1
emacs.1
etags.1
h2ph.1
perl.1
s2p.1
</pre>
<p class="noindent">Now suppose it's time to uninstall Perl. Which man pages
get removed? Obviously <samp><span class="file">perl.1</span></samp> is one of them, but it should not
be the administrator's responsibility to memorize the ownership of
individual files by separate packages.
<p>The approach used by Stow is to install each package into its own
tree, then use symbolic links to make it appear as though the files are
installed in the common tree. Administration can be performed in the
package's private tree in isolation from clutter from other packages.
Stow can then be used to update the symbolic links. The structure
of each private tree should reflect the desired structure in the common
tree; i.e. (in the typical case) there should be a <samp><span class="file">bin</span></samp> directory
containing executables, a <samp><span class="file">man/man1</span></samp> directory containing section 1
man pages, and so on.
<p>Stow was inspired by Carnegie Mellon's Depot program, but is
substantially simpler and safer. Whereas Depot required database files
to keep things in sync, Stow stores no extra state between runs, so
there's no danger (as there was in Depot) of mangling directories when
file hierarchies don't match the database. Also unlike Depot, Stow will
never delete any files, directories, or links that appear in a Stow
directory (e.g., <samp><span class="file">/usr/local/stow/emacs</span></samp>), so it's always possible
to rebuild the target tree (e.g., <samp><span class="file">/usr/local</span></samp>).
<p>For information about the latest version of Stow, you can refer to
<a href="http://www.gnu.org/software/stow/">http://www.gnu.org/software/stow/</a>.
<!-- =========================================================================== -->
<div class="footnote">
<hr>
<h4>Footnotes</h4><p class="footnote"><small>[<a name="fn-1" href="#fnd-1">1</a>]</small> As of Perl 4.036 and Emacs
19.22.</p>
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<h2 class="chapter">3 Invoking Stow</h2>
<p>The syntax of the <samp><span class="command">stow</span></samp> command is:
<pre class="example"> stow [<var>options</var>] [<var>action flag</var>] <var>package <small class="dots">...</small></var>
</pre>
<p class="noindent">Each <var>package</var> is the name of a package (e.g., &lsquo;<samp><span class="samp">perl</span></samp>&rsquo;) in the stow
directory that we wish to install into (or delete from) the target directory.
The default action is to install the given packages, although alternate actions
may be specified by preceding the package name(s) with an <var>action flag</var>.
<p class="noindent">The following options are supported:
<dl>
<dt>&lsquo;<samp><span class="samp">-d </span><var>dir</var></samp>&rsquo;<dt>&lsquo;<samp><span class="samp">--dir=</span><var>dir</var></samp>&rsquo;<dd>Set the stow directory to <var>dir</var>. Defaults to the value of the environment
variable <samp><span class="env">STOW_DIR</span></samp> if set, or the current directory otherwise.
<br><dt>&lsquo;<samp><span class="samp">-t </span><var>dir</var></samp>&rsquo;<dt>&lsquo;<samp><span class="samp">--target=</span><var>dir</var></samp>&rsquo;<dd>Set the target directory to <var>dir</var> instead of the parent of the stow
directory. Defaults to the parent of the stow directory, so it is typical to
execute <samp><span class="command">stow</span></samp> from the directory <samp><span class="file">/usr/local/stow</span></samp>.
<br><dt>&lsquo;<samp><span class="samp">--ignore=</span><var>regexp</var></samp>&rsquo;<dd>This (repeatable) option lets you suppress acting on files that match the
given perl regular expression. For example, using the options
<pre class="example"> --ignore='*.orig' --ignore='*.dist'
</pre>
<p class="noindent">will cause stow to ignore files ending in <samp><span class="file">.orig</span></samp> or <samp><span class="file">.dist</span></samp>.
<p>Note that the regular expression is anchored to the end of the filename,
because this is what you will want to do most of the time.
<p>Also note that by default Stow automatically ignores a &ldquo;sensible&rdquo;
built-in list of files and directories such as <samp><span class="file">CVS</span></samp>, editor
backup files, and so on. See <a href="Ignore-Lists.html#Ignore-Lists">Ignore Lists</a>, for more details.
<br><dt>&lsquo;<samp><span class="samp">--defer=</span><var>regexp</var></samp>&rsquo;<dd>This (repeatable) option avoids stowing a file matching the given
regular expression, if that file is already stowed by another package.
This is effectively the opposite of <samp><span class="option">--override</span></samp>.
<p>(N.B. the name <samp><span class="option">--defer</span></samp> was chosen in the sense that the package
currently being stowed is treated with lower precedence than any
already installed package, not in the sense that the operation is
being postponed to be run at a later point in time; do not confuse
this nomenclature with the wording used in <a href="Deferred-Operation.html#Deferred-Operation">Deferred Operation</a>.)
<p>For example, the following options
<pre class="example"> --defer=man --defer=info
</pre>
<p class="noindent">will cause stow to skip over pre-existing man and info pages.
<p>Equivalently, you could use &lsquo;<samp><span class="samp">--defer='man|info'</span></samp>&rsquo; since the
argument is just a Perl regex.
<p>Note that the regular expression is anchored to the beginning of the path
relative to the target directory, because this is what you will want to do most
of the time.
<br><dt>&lsquo;<samp><span class="samp">--override=</span><var>regexp</var></samp>&rsquo;<dd>This (repeatable) option forces any file matching the regular expression to be
stowed, even if the file is already stowed to another package. For example,
the following options
<pre class="example"> --override=man --override=info
</pre>
<p class="noindent">will permit stow to overwrite links that point to pre-existing man and info
pages that are owned by stow and would otherwise cause a conflict.
<p>The regular expression is anchored to the beginning of the path relative to
the target directory, because this is what you will want to do most of the time.
<br><dt>&lsquo;<samp><span class="samp">--no-folding</span></samp>&rsquo;<dd>
This disables any further <a href="tree-folding.html#tree-folding">tree folding</a> or <a href="tree-refolding.html#tree-refolding">tree refolding</a>.
If a new subdirectory is encountered whilst stowing a new package, the
subdirectory is created within the target, and its contents are
symlinked, rather than just creating a symlink for the directory. If
removal of symlinks whilst unstowing a package causes a subtree to be
foldable (i.e. only containing symlinks to a single package), that
subtree will not be removed and replaced with a symlink.
<p><a name="index-adopting-existing-files-10"></a><br><dt>&lsquo;<samp><span class="samp">--adopt</span></samp>&rsquo;<dd><strong>Warning!</strong> This behaviour is specifically intended to alter the
contents of your stow directory. If you do not want that, this option
is not for you.
<p>When stowing, if a target is encountered which already exists but is a
plain file (and hence not owned by any existing stow package), then
normally Stow will register this as a conflict and refuse to proceed.
This option changes that behaviour so that the file is moved to the
same relative place within the package's installation image within the
stow directory, and then stowing proceeds as before. So effectively,
the file becomes adopted by the stow package, without its contents
changing.
<p>This is particularly useful when the stow package is under the control
of a version control system, because it allows files in the target
tree, with potentially different contents to the equivalent versions
in the stow package's installation image, to be adopted into the
package, then compared by running something like &lsquo;<samp><span class="samp">git diff ...</span></samp>&rsquo;
inside the stow package, and finally either kept (e.g. via &lsquo;<samp><span class="samp">git
commit ...</span></samp>&rsquo;) or discarded (&lsquo;<samp><span class="samp">git checkout HEAD ...</span></samp>&rsquo;).
<p><a name="index-dry-run-11"></a><a name="index-simulated-run-12"></a><br><dt>&lsquo;<samp><span class="samp">-n</span></samp>&rsquo;<dt>&lsquo;<samp><span class="samp">--no</span></samp>&rsquo;<dt>&lsquo;<samp><span class="samp">--simulate</span></samp>&rsquo;<dd>Do not perform any operations that modify the file system; in combination with
<samp><span class="option">-v</span></samp> can be used to merely show what would happen.
<p><a name="index-verbosity-levels-13"></a><br><dt>&lsquo;<samp><span class="samp">-v</span></samp>&rsquo;<dt>&lsquo;<samp><span class="samp">--verbose[=</span><var>n</var><span class="samp">]</span></samp>&rsquo;<dd>Send verbose output to standard error describing what Stow is
doing. Verbosity levels are 0, 1, 2, and 3; 0 is the default. Using
<samp><span class="option">-v</span></samp> or <samp><span class="option">--verbose</span></samp> increases the verbosity by one; using
&lsquo;<samp><span class="samp">--verbose=</span><var>n</var></samp>&rsquo; sets it to <var>n</var>.
<br><dt>&lsquo;<samp><span class="samp">-p</span></samp>&rsquo;<dt>&lsquo;<samp><span class="samp">--compat</span></samp>&rsquo;<dd>Scan the whole target tree when unstowing. By default, only
directories specified in the <dfn>installation image</dfn> are scanned
during an unstow operation. Scanning the whole tree can be
prohibitive if your target tree is very large. This option restores
the legacy behaviour; however, the <samp><span class="option">--badlinks</span></samp> option to the
<samp><span class="command">chkstow</span></samp> utility may be a better way of ensuring that your
installation does not have any dangling symlinks (see <a href="Target-Maintenance.html#Target-Maintenance">Target Maintenance</a>).
<br><dt>&lsquo;<samp><span class="samp">-V</span></samp>&rsquo;<dt>&lsquo;<samp><span class="samp">--version</span></samp>&rsquo;<dd>Show Stow version number, and exit.
<br><dt>&lsquo;<samp><span class="samp">-h</span></samp>&rsquo;<dt>&lsquo;<samp><span class="samp">--help</span></samp>&rsquo;<dd>Show Stow command syntax, and exit.
</dl>
<p>The following <var>action flags</var> are supported:
<dl>
<dt>&lsquo;<samp><span class="samp">-D</span></samp>&rsquo;<dt>&lsquo;<samp><span class="samp">--delete</span></samp>&rsquo;<dd>Delete (unstow) the package name(s) that follow this option from the <dfn>target
directory</dfn>. This option may be repeated any number of times.
<br><dt>&lsquo;<samp><span class="samp">-R</span></samp>&rsquo;<dt>&lsquo;<samp><span class="samp">--restow</span></samp>&rsquo;<dd>Restow (first unstow, then stow again) the package names that follow this
option. This is useful for pruning obsolete symlinks from the target tree
after updating the software in a package. This option may be repeated any
number of times.
<br><dt>&lsquo;<samp><span class="samp">-S</span></samp>&rsquo;<br><dt>&lsquo;<samp><span class="samp">--stow</span></samp>&rsquo;<dd>explictly stow the package name(s) that follow this option. May be
omitted if you are not using the <samp><span class="option">-D</span></samp> or <samp><span class="option">-R</span></samp> options in the
same invocation. See <a href="Mixing-Operations.html#Mixing-Operations">Mixing Operations</a>, for details of when you
might like to use this feature. This option may be repeated any number
of times.
</dl>
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<p>
Previous:&nbsp;<a rel="previous" accesskey="p" href="Types-And-Syntax-Of-Ignore-Lists.html#Types-And-Syntax-Of-Ignore-Lists">Types And Syntax Of Ignore Lists</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="Ignore-Lists.html#Ignore-Lists">Ignore Lists</a>
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<h3 class="section">4.3 Justification For Yet Another Set Of Ignore Files</h3>
<p>The reader may note that this format is very similar to existing
ignore list file formats, such as those for <samp><span class="command">cvs</span></samp>, <samp><span class="command">git</span></samp>,
<samp><span class="command">rsync</span></samp> etc., and wonder if another set of ignore lists is
justified. However there are good reasons why Stow does not simply
check for the presence of say, <samp><span class="file">.cvsignore</span></samp>, and use that if it
exists. Firstly, there is no guarantee that a stow package would
contain any version control meta-data, or permit introducing this if
it didn't already exist.
<p>Secondly even if it did, version control system ignore lists generally
reflect <em>build-time</em> ignores rather than <em>install-time</em>, and
there may be some intermediate or temporary files on those ignore
lists generated during development or at build-time which it would be
inappropriate to stow, even though many files generated at build-time
(binaries, libraries, documentation etc.) certainly do need to be
stowed. Similarly, if a file is <em>not</em> in the version control
system's ignore list, there is no way of knowing whether the file is
intended for end use, let alone whether the version control system is
tracking it or not.
<p>Therefore it seems clear that ignore lists provided by version control
systems do not provide sufficient information for Stow to determine
which files and directories to stow, and so it makes sense for Stow to
support independent ignore lists.
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<h2 class="chapter">15 Known Bugs</h2>
<p>There are no known bugs in Stow version 2.2.2!
If you think you have found one, please see <a href="Reporting-Bugs.html#Reporting-Bugs">Reporting Bugs</a>.
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<h2 class="chapter">8 Mixing Operations</h2>
<p><a name="index-mixing-operations-33"></a>
Since version 2.0, multiple distinct actions can be specified in a single
invocation of GNU Stow. For example, to update an installation of Emacs from
version 21.3 to 21.4a you can now do the following:
<pre class="example"> stow -D emacs-21.3 -S emacs-21.4a
</pre>
<p class="noindent">which will replace emacs-21.3 with emacs-21.4a using a single invocation.
<p><a name="index-deferred-operation-34"></a>This is much faster and cleaner than performing two separate
invocations of stow, because redundant folding/unfolding operations
can be factored out. In addition, all the operations are calculated
and merged before being executed (see <a href="Deferred-Operation.html#Deferred-Operation">Deferred Operation</a>), so the
amount of of time in which GNU Emacs is unavailable is minimised.
<p>You can mix and match any number of actions, for example,
<pre class="example"> stow -S pkg1 pkg2 -D pkg3 pkg4 -S pkg5 -R pkg6
</pre>
<p class="noindent">will unstow pkg3, pkg4 and pkg6, then stow pkg1, pkg2, pkg5 and pkg6.
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<h3 class="section">4.1 Motivation For Ignore Lists</h3>
<p>In many situations, there will exist files under the package
directories which it would be undesirable to stow into the target
directory. For example, files related version control such as
<samp><span class="file">.gitignore</span></samp>, <samp><span class="file">CVS</span></samp>, <samp><span class="file">*,v</span></samp> (RCS files) should typically
not have symlinks from the target tree pointing to them. Also there
may be files or directories relating to the build of the package which
are not needed at run-time.
<p>In these cases, it can be rather cumbersome to specify a
<samp><span class="option">--ignore</span></samp> parameter for each file or directory to be ignored.
This could be worked around by ensuring the existence of
<samp><span class="file">~/.stowrc</span></samp> containing multiple <samp><span class="option">--ignore</span></samp> lines, or if a
different set of files/directories should be ignored depending on
which stow package is involved, a <samp><span class="file">.stowrc</span></samp> file for each stow
package, but this would require the user to ensure that they were in
the correct directory before invoking stow, which would be tedious and
error-prone. Furthermore, since Stow shifts parameters from
<samp><span class="file">.stowrc</span></samp> onto ARGV at run-time, it could clutter up the process
table with excessively long parameter lists, or even worse, exceed the
operating system's limit for process arguments.
<p><a name="index-ignore-lists-16"></a>Therefore in addition to <samp><span class="option">--ignore</span></samp> parameters, Stow provides a
way to specify lists of files and directories to ignore.
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(C) 2000, 2001 Guillaume Morin <gmorin@gnu.org>
(C) 2007 Kahlil (Kal) Hodgson <kahlil@internode.on.net>
(C) 2011 Adam Spiers <stow@adamspiers.org>
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<h2 class="chapter">9 Multiple Stow Directories</h2>
<p>If there are two or more system administrators who wish to maintain
software separately, or if there is any other reason to want two or more
stow directories, it can be done by creating a file named <samp><span class="file">.stow</span></samp>
in each stow directory. The presence of <samp><span class="file">/usr/local/foo/.stow</span></samp>
informs Stow that, though <samp><span class="file">foo</span></samp> is not the current stow
directory, even if it is a subdirectory of the target directory,
nevertheless it is <em>a</em> stow directory and as such Stow
doesn't &ldquo;own&rdquo; anything in it (see <a href="Installing-Packages.html#Installing-Packages">Installing Packages</a>). This will
protect the contents of <samp><span class="file">foo</span></samp> from a &lsquo;<samp><span class="samp">stow -D</span></samp>&rsquo;, for instance.
<!-- There is a test for the following case in t/examples.t: -->
<p>When multiple stow directories share a target tree, if a tree-folding
symlink is encountered and needs to be split open during an
installation, as long as the top-level stow directory into which the
existing symlink points contains <samp><span class="file">.stow</span></samp>, Stow knows how to split
open the tree in the correct manner.
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<hr>
</div>
<h3 class="section">12.3 Other FSF Software</h3>
<p>The Free Software Foundation, the organization behind the GNU project,
has been unifying the build procedure for its tools for some time.
Thanks to its tools &lsquo;<samp><span class="samp">autoconf</span></samp>&rsquo; and &lsquo;<samp><span class="samp">automake</span></samp>&rsquo;, most packages
now respond well to these simple steps, with no other intervention
necessary:
<pre class="example"> ./configure <var>options</var>
make
make install prefix=/usr/local/stow/<var>package</var>
</pre>
<p>Hopefully, these tools can evolve to be aware of Stow-managed packages,
such that providing an option to &lsquo;<samp><span class="samp">configure</span></samp>&rsquo; can allow &lsquo;<samp><span class="samp">make</span></samp>&rsquo;
and &lsquo;<samp><span class="samp">make install</span></samp>&rsquo; steps to work correctly without needing to
&ldquo;fool&rdquo; the build process.
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(C) 2000, 2001 Guillaume Morin <gmorin@gnu.org>
(C) 2007 Kahlil (Kal) Hodgson <kahlil@internode.on.net>
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Up:&nbsp;<a rel="up" accesskey="u" href="Compile_002dtime-vs-Install_002dtime.html#Compile_002dtime-vs-Install_002dtime">Compile-time vs Install-time</a>
<hr>
</div>
<h3 class="section">12.5 Perl and Perl 5 Modules</h3>
<p>Perl 4.036 allows you to specify different locations for installation
and for run-time. It is the only widely-used package in this author's
experience that allows this, though hopefully more packages will adopt
this model.
<p>Unfortunately, the authors of Perl believed that only AFS sites need
this ability. The configuration instructions for Perl 4 misleadingly
state that some occult means are used under AFS to transport files from
their installation tree to their run-time tree. In fact, that confusion
arises from the fact that Depot, Stow's predecessor, originated at
Carnegie Mellon University, which was also the birthplace of AFS. CMU's
need to separate install-time and run-time trees stemmed from its use of
Depot, not from AFS.
<p>The result of this confusion is that Perl 5's configuration script
doesn't even offer the option of separating install-time and run-time
trees <em>unless</em> you're running AFS. Fortunately, after you've
entered all the configuration settings, Perl's setup script gives you
the opportunity to edit those settings in a file called
<samp><span class="file">config.sh</span></samp>. When prompted, you should edit this file and replace
occurrences of
<pre class="example"> inst<span class="roman">...</span>/usr/local<span class="roman">...</span>
</pre>
<p class="noindent">with
<pre class="example"> inst<span class="roman">...</span>/usr/local/stow/perl<span class="roman">...</span>
</pre>
<p class="noindent">You can do this with the following Unix command:
<pre class="example"> sed 's,^\(inst.*/usr/local\),\1/stow/perl,' config.sh &gt; config.sh.new
mv config.sh.new config.sh
</pre>
<p>Hopefully, the Perl authors will correct this deficiency in Perl 5's
configuration mechanism.
<p>Perl 5 modules&mdash;i.e., extensions to Perl 5&mdash;generally conform to a set
of standards for building and installing them. The standard says that
the package comes with a top-level <samp><span class="file">Makefile.PL</span></samp>, which is a Perl
script. When it runs, it generates a <samp><span class="file">Makefile</span></samp>.
<p>If you followed the instructions above for editing <samp><span class="file">config.sh</span></samp> when
Perl was built, then when you create a <samp><span class="file">Makefile</span></samp> from a
<samp><span class="file">Makefile.PL</span></samp>, it will contain separate locations for run-time
(<samp><span class="file">/usr/local</span></samp>) and install-time (<samp><span class="file">/usr/local/stow/perl</span></samp>).
Thus you can do
<pre class="example"> perl Makefile.PL
make
make install
</pre>
<p class="noindent">and the files will be installed into <samp><span class="file">/usr/local/stow/perl</span></samp>.
However, you might prefer each Perl module to be stowed separately. In
that case, you must edit the resulting Makefile, replacing
<samp><span class="file">/usr/local/stow/perl</span></samp> with <samp><span class="file">/usr/local/stow/</span><var>module</var></samp>.
The best way to do this is:
<pre class="example"> perl Makefile.PL
find . -name Makefile -print | \
xargs perl -pi~ -e 's,^(INST.*/stow)/perl,$1/<var>module</var>,;'
make
make install
</pre>
<p class="noindent">(The use of &lsquo;<samp><span class="samp">find</span></samp>&rsquo; and &lsquo;<samp><span class="samp">xargs</span></samp>&rsquo; ensures that all Makefiles in
the module's source tree, even those in subdirectories, get edited.) A
good convention to follow is to name the stow directory for a Perl
<var>module</var> <samp><span class="file">cpan.</span><var>module</var></samp>, where &lsquo;<samp><span class="samp">cpan</span></samp>&rsquo; stands for
Comprehensive Perl Archive Network, a collection of FTP sites that is
the source of most Perl 5 extensions. This way, it's easy to tell at a
glance which of the subdirectories of <samp><span class="file">/usr/local/stow</span></samp> are Perl 5
extensions.
<p>When you stow separate Perl 5 modules separately, you are likely to
encounter conflicts (see <a href="Conflicts.html#Conflicts">Conflicts</a>) with files named <samp><span class="file">.exists</span></samp>
and <samp><span class="file">perllocal.pod</span></samp>. One way to work around this is to remove
those files before stowing the module. If you use the
<samp><span class="file">cpan.</span><var>module</var></samp> naming convention, you can simply do this:
<pre class="example"> cd /usr/local/stow
find cpan.* \( -name .exists -o -name perllocal.pod \) -print | \
xargs rm
</pre>
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(C) 2000, 2001 Guillaume Morin <gmorin@gnu.org>
(C) 2007 Kahlil (Kal) Hodgson <kahlil@internode.on.net>
(C) 2011 Adam Spiers <stow@adamspiers.org>
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<h2 class="chapter">14 Reporting Bugs</h2>
<p>Please send bug reports to the current maintainers by electronic
mail. The address to use is &lsquo;<samp><span class="samp">&lt;bug-stow@gnu.org&gt;</span></samp>&rsquo;. Please
include:
<ul>
<li>the version number of Stow (&lsquo;<samp><span class="samp">stow --version</span></samp>&rsquo;);
<li>the version number of Perl (&lsquo;<samp><span class="samp">perl -v</span></samp>&rsquo;);
<li>the system information, which can often be obtained with &lsquo;<samp><span class="samp">uname
-a</span></samp>&rsquo;;
<li>a description of the bug;
<li>the precise command you gave;
<li>the output from the command (preferably verbose output, obtained by
adding &lsquo;<samp><span class="samp">--verbose=3</span></samp>&rsquo; to the Stow command line).
</ul>
<p>If you are really keen, consider developing a minimal test case and
creating a new test. See the <samp><span class="file">t/</span></samp> directory in the source for
lots of examples.
<p>Before reporting a bug, please read the manual carefully, especially
<a href="Known-Bugs.html#Known-Bugs">Known Bugs</a>, to see whether you're encountering
something that doesn't need reporting.
(see <a href="Conflicts.html#Conflicts">Conflicts</a>).
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(C) 2000, 2001 Guillaume Morin <gmorin@gnu.org>
(C) 2007 Kahlil (Kal) Hodgson <kahlil@internode.on.net>
(C) 2011 Adam Spiers <stow@adamspiers.org>
Permission is granted to make and distribute verbatim copies of
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Previous:&nbsp;<a rel="previous" accesskey="p" href="Target-Maintenance.html#Target-Maintenance">Target Maintenance</a>,
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<hr>
</div>
<h2 class="chapter">11 Resource Files</h2>
<p><a name="index-resource-files-36"></a><a name="index-configuration-files-37"></a>
Default command line options may be set in <samp><span class="file">.stowrc</span></samp> (current directory) or
<samp><span class="file">~/.stowrc</span></samp> (home directory). These are parsed in that order, and effectively
prepended to you command line. This feature can be used for some interesting
effects.
<p>For example, suppose your site uses more than one stow directory, perhaps in
order to share around responsibilities with a number of systems
administrators. One of the administrators might have the following in their
<samp><span class="file">~/.stowrc</span></samp> file:
<pre class="example"> --dir=/usr/local/stow2
--target=/usr/local
--ignore='~'
--ignore='^CVS'
</pre>
<p>so that the <samp><span class="command">stow</span></samp> command will default to operating on the
<samp><span class="file">/usr/local/stow2</span></samp> directory, with <samp><span class="file">/usr/local</span></samp> as the
target, and ignoring vi backup files and CVS directories.
<p>If you had a stow directory <samp><span class="file">/usr/local/stow/perl-extras</span></samp> that
was only used for Perl modules, then you might place the following in
<samp><span class="file">/usr/local/stow/perl-extras/.stowrc</span></samp>:
<pre class="example"> --dir=/usr/local/stow/perl-extras
--target=/usr/local
--override=bin
--override=man
--ignore='perllocal\.pod'
--ignore='\.packlist'
--ignore='\.bs'
</pre>
<p>so that when you are in the <samp><span class="file">/usr/local/stow/perl-extras</span></samp>
directory, <samp><span class="command">stow</span></samp> will regard any subdirectories as stow
packages, with <samp><span class="file">/usr/local</span></samp> as the target (rather than the
immediate parent directory <samp><span class="file">/usr/local/stow</span></samp>), overriding any
pre-existing links to bin files or man pages, and ignoring some cruft
that gets installed by default.
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<p>
Next:&nbsp;<a rel="next" accesskey="n" href="Resource-Files.html#Resource-Files">Resource Files</a>,
Previous:&nbsp;<a rel="previous" accesskey="p" href="Multiple-Stow-Directories.html#Multiple-Stow-Directories">Multiple Stow Directories</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="index.html#Top">Top</a>
<hr>
</div>
<h2 class="chapter">10 Target Maintenance</h2>
<p><a name="index-maintenance-35"></a>From time to time you will need to clean up your target tree. Since
version 2, Stow provides a new utility <samp><span class="command">chkstow</span></samp> to help with
this. It includes three operational modes which performs checks that
would generally be too expensive to be performed during normal stow
execution.
<p>The syntax of the <samp><span class="command">chkstow</span></samp> command is:
<pre class="example"> chkstow [<var>options</var>]
</pre>
<p class="noindent">The following options are supported:
<dl>
<dt>&lsquo;<samp><span class="samp">-t </span><var>dir</var></samp>&rsquo;<dt>&lsquo;<samp><span class="samp">--target=</span><var>dir</var></samp>&rsquo;<dd>Set the target directory to <var>dir</var> instead of the parent of the stow
directory. Defaults to the parent of the stow directory, so it is typical to
execute <samp><span class="command">stow</span></samp> from the directory <samp><span class="file">/usr/local/stow</span></samp>.
<br><dt>&lsquo;<samp><span class="samp">-b</span></samp>&rsquo;<dt>&lsquo;<samp><span class="samp">--badlinks</span></samp>&rsquo;<dd>Checks target directory for bogus symbolic links. That is, links that point to
non-existent files.
<br><dt>&lsquo;<samp><span class="samp">-a</span></samp>&rsquo;<dt>&lsquo;<samp><span class="samp">--aliens</span></samp>&rsquo;<dd>Checks for files in the target directory that are not symbolic links. The
target directory should be managed by stow alone, except for directories that
contain a <samp><span class="file">.stow</span></samp> file.
<br><dt>&lsquo;<samp><span class="samp">-l</span></samp>&rsquo;<dt>&lsquo;<samp><span class="samp">--list</span></samp>&rsquo;<dd>Will display the target package for every symbolic link in the stow target
directory.
</dl>
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Previous:&nbsp;<a rel="previous" accesskey="p" href="Introduction.html#Introduction">Introduction</a>,
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<h2 class="chapter">2 Terminology</h2>
<p class="indent"><a name="index-package-1"></a>A <dfn>package</dfn> is a related collection of files and directories that
you wish to administer as a unit &mdash; e.g., Perl or Emacs &mdash; and that needs
to be installed in a particular directory structure &mdash; e.g., with
<samp><span class="file">bin</span></samp>, <samp><span class="file">lib</span></samp>, and <samp><span class="file">man</span></samp> subdirectories.
<p><a name="index-target-directory-2"></a>A <dfn>target directory</dfn> is the root of a tree in which one or more
packages wish to <em>appear</em> to be installed. A common, but by no
means the only such location is <samp><span class="file">/usr/local</span></samp>. The examples in this
manual will use <samp><span class="file">/usr/local</span></samp> as the target directory.
<p><a name="index-stow-directory-3"></a>A <dfn>stow directory</dfn> is the root of a tree containing separate
packages in private subtrees. When Stow runs, it uses the current
directory as the default stow directory. The examples in this manual
will use <samp><span class="file">/usr/local/stow</span></samp> as the stow directory, so that
individual packages will be, for example, <samp><span class="file">/usr/local/stow/perl</span></samp>
and <samp><span class="file">/usr/local/stow/emacs</span></samp>.
<p><a name="index-installation-image-4"></a>An <dfn>installation image</dfn> is the layout of files and directories
required by a package, relative to the target directory. Thus, the
installation image for Perl includes: a <samp><span class="file">bin</span></samp> directory containing
<samp><span class="file">perl</span></samp> and <samp><span class="file">a2p</span></samp> (among others); an <samp><span class="file">info</span></samp> directory
containing Texinfo documentation; a <samp><span class="file">lib/perl</span></samp> directory containing
Perl libraries; and a <samp><span class="file">man/man1</span></samp> directory containing man pages.
<p><a name="index-package-directory-5"></a><a name="index-package-name-6"></a>A <dfn>package directory</dfn> is the root of a tree containing the
installation image for a particular package. Each package directory
must reside in a stow directory &mdash; e.g., the package directory
<samp><span class="file">/usr/local/stow/perl</span></samp> must reside in the stow directory
<samp><span class="file">/usr/local/stow</span></samp>. The <dfn>name</dfn> of a package is the name of its
directory within the stow directory &mdash; e.g., <samp><span class="file">perl</span></samp>.
<p>Thus, the Perl executable might reside in
<samp><span class="file">/usr/local/stow/perl/bin/perl</span></samp>, where <samp><span class="file">/usr/local</span></samp> is the
target directory, <samp><span class="file">/usr/local/stow</span></samp> is the stow directory,
<samp><span class="file">/usr/local/stow/perl</span></samp> is the package directory, and
<samp><span class="file">bin/perl</span></samp> within is part of the installation image.
<p><a name="index-symlink-7"></a><a name="index-relative-symlink-8"></a><a name="index-absolute-symlink-9"></a>A <dfn>symlink</dfn> is a symbolic link. A symlink can be <dfn>relative</dfn> or
<dfn>absolute</dfn>. An absolute symlink names a full path; that is, one
starting from <samp><span class="file">/</span></samp>. A relative symlink names a relative path; that
is, one not starting from <samp><span class="file">/</span></samp>. The target of a relative symlink is
computed starting from the symlink's own directory. Stow only
creates relative symlinks.
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<p>
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Previous:&nbsp;<a rel="previous" accesskey="p" href="Motivation-For-Ignore-Lists.html#Motivation-For-Ignore-Lists">Motivation For Ignore Lists</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="Ignore-Lists.html#Ignore-Lists">Ignore Lists</a>
<hr>
</div>
<h3 class="section">4.2 Types And Syntax Of Ignore Lists</h3>
<p>If you put Perl regular expressions, one per line, in a
<samp><span class="file">.stow-local-ignore</span></samp> file within any top level package directory,
in which case any file or directory within that package matching any
of these regular expressions will be ignored. In the absence of this
package-specific ignore list, Stow will instead use the contents of
<samp><span class="file">~/.stow-global-ignore</span></samp>, if it exists. If neither the
package-local or global ignore list exist, Stow will use its own
built-in default ignore list, which serves as a useful example of the
format of these ignore list files:
<pre class="example"><pre class="verbatim"> # Comments and blank lines are allowed.
RCS
.+,v
CVS
\.\#.+ # CVS conflict files / emacs lock files
\.cvsignore
\.svn
_darcs
\.hg
\.git
\.gitignore
.+~ # emacs backup files
\#.*\# # emacs autosave files
^/README.*
^/LICENSE.*
^/COPYING
</pre></pre>
<p>Stow first iterates through the chosen ignore list (built-in, global,
or package-local) as per above, stripping out comments (if you want to
include the &lsquo;<samp><span class="samp">#</span></samp>&rsquo; symbol in a regular expression, escape it with a
blackslash) and blank lines, placing each regular expressions into one
of two sets depending on whether it contains the &lsquo;<samp><span class="samp">/</span></samp>&rsquo; forward
slash symbol.
<p>Then in order to determine whether a file or directory should be
ignored:
<ol type=1 start=1>
<li>Stow calculates its path relative to the top-level package directory,
prefixing that with &lsquo;<samp><span class="samp">/</span></samp>&rsquo;. If any of the regular expressions
containing a &lsquo;<samp><span class="samp">/</span></samp>&rsquo; <em>exactly</em><a rel="footnote" href="#fn-1" name="fnd-1"><sup>1</sup></a> match
a subpath<a rel="footnote" href="#fn-2" name="fnd-2"><sup>2</sup></a> of this relative path, then the file or
directory will be ignored.
<li>If none of the regular expressions containing a &lsquo;<samp><span class="samp">/</span></samp>&rsquo; match in the
manner described above, Stow checks whether the
<em>basename</em><a rel="footnote" href="#fn-3" name="fnd-3"><sup>3</sup></a> of the file or directory matches
<em>exactly</em> against the remaining regular expressions which do not
contain a &lsquo;<samp><span class="samp">/</span></samp>&rsquo;, and if so, ignores the file or directory.
<li>Otherwise, the file or directory is not ignored.
</ol>
<!-- N.B. if you change the examples below, please also consider -->
<!-- updating test_examples_in_manual() in t/ignore.t. -->
<p>For example, if a file <samp><span class="file">bazqux</span></samp> is in the <samp><span class="file">foo/bar</span></samp>
subdirectory of the package directory, Stow would use
&lsquo;<samp><span class="samp">/foo/bar/bazqux</span></samp>&rsquo; as the text for matching against regular
expressions which contain &lsquo;<samp><span class="samp">/</span></samp>&rsquo;, and &lsquo;<samp><span class="samp">bazqux</span></samp>&rsquo; as the text for
matching against regular expressions which don't contain &lsquo;<samp><span class="samp">/</span></samp>&rsquo;.
Then regular expressions &lsquo;<samp><span class="samp">bazqux</span></samp>&rsquo;, &lsquo;<samp><span class="samp">baz.*</span></samp>&rsquo;, &lsquo;<samp><span class="samp">.*qux</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">bar/.*x</span></samp>&rsquo;, and &lsquo;<samp><span class="samp">^/foo/.*qux</span></samp>&rsquo; would all match (causing the
file to be ignored), whereas &lsquo;<samp><span class="samp">bar</span></samp>&rsquo;, &lsquo;<samp><span class="samp">baz</span></samp>&rsquo;, &lsquo;<samp><span class="samp">qux</span></samp>&rsquo;, and
&lsquo;<samp><span class="samp">o/bar/b</span></samp>&rsquo; would not (although &lsquo;<samp><span class="samp">bar</span></samp>&rsquo; would cause its parent
directory to be ignored and prevent Stow from recursing into that
anyway, in which case the file <samp><span class="file">bazqux</span></samp> would not even be
considered for stowing).
<p>As a special exception to the above algorithm, any
<samp><span class="file">.stow-local-ignore</span></samp> present in the top-level package directory
is <em>always</em> ignored, regardless of the contents of any ignore
list, because this file serves no purpose outside the stow directory.
<!-- =========================================================================== -->
<div class="footnote">
<hr>
<h4>Footnotes</h4><p class="footnote"><small>[<a name="fn-1" href="#fnd-1">1</a>]</small> Exact matching means the
regular expression is anchored at the beginning and end, in contrast
to unanchored regular expressions which will match a substring.</p>
<p class="footnote"><small>[<a name="fn-2" href="#fnd-2">2</a>]</small> In this context, &ldquo;subpath&rdquo; means a contiguous
subset of path segments; e.g for the relative path
<samp><span class="file">one/two/three</span></samp>, there are six valid subpaths: <samp><span class="file">one</span></samp>,
<samp><span class="file">two</span></samp>, <samp><span class="file">three</span></samp>, <samp><span class="file">one/two</span></samp>, <samp><span class="file">two/three</span></samp>,
<samp><span class="file">one/two/three</span></samp>.</p>
<p class="footnote"><small>[<a name="fn-3" href="#fnd-3">3</a>]</small> The &ldquo;basename&rdquo; is the name of the file or
directory itself, excluding any directory path prefix - as returned by
the <samp><span class="command">basename</span></samp> command.</p>
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(C) 2000, 2001 Guillaume Morin <gmorin@gnu.org>
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<h1 class="settitle">Stow</h1>
<div class="contents">
<h2>Table of Contents</h2>
<ul>
<li><a name="toc_Top" href="index.html#Top">Stow</a>
<li><a name="toc_Introduction" href="Introduction.html#Introduction">1 Introduction</a>
<li><a name="toc_Terminology" href="Terminology.html#Terminology">2 Terminology</a>
<li><a name="toc_Invoking-Stow" href="Invoking-Stow.html#Invoking-Stow">3 Invoking Stow</a>
<li><a name="toc_Ignore-Lists" href="Ignore-Lists.html#Ignore-Lists">4 Ignore Lists</a>
<ul>
<li><a href="Motivation-For-Ignore-Lists.html#Motivation-For-Ignore-Lists">4.1 Motivation For Ignore Lists</a>
<li><a href="Types-And-Syntax-Of-Ignore-Lists.html#Types-And-Syntax-Of-Ignore-Lists">4.2 Types And Syntax Of Ignore Lists</a>
<li><a href="Justification-For-Yet-Another-Set-Of-Ignore-Files.html#Justification-For-Yet-Another-Set-Of-Ignore-Files">4.3 Justification For Yet Another Set Of Ignore Files</a>
</li></ul>
<li><a name="toc_Installing-Packages" href="Installing-Packages.html#Installing-Packages">5 Installing Packages</a>
<ul>
<li><a href="Installing-Packages.html#Installing-Packages">5.1 Tree folding</a>
<li><a href="Installing-Packages.html#Installing-Packages">5.2 Tree unfolding</a>
<li><a href="Installing-Packages.html#Installing-Packages">5.3 Ownership</a>
<li><a href="Installing-Packages.html#Installing-Packages">5.4 Conflicts during installation</a>
</li></ul>
<li><a name="toc_Deleting-Packages" href="Deleting-Packages.html#Deleting-Packages">6 Deleting Packages</a>
<ul>
<li><a href="Deleting-Packages.html#Deleting-Packages">6.1 Refolding &ldquo;foldable&rdquo; trees.</a>
</li></ul>
<li><a name="toc_Conflicts" href="Conflicts.html#Conflicts">7 Conflicts</a>
<ul>
<li><a href="Conflicts.html#Conflicts">7.1 Deferred Operation</a>
</li></ul>
<li><a name="toc_Mixing-Operations" href="Mixing-Operations.html#Mixing-Operations">8 Mixing Operations</a>
<li><a name="toc_Multiple-Stow-Directories" href="Multiple-Stow-Directories.html#Multiple-Stow-Directories">9 Multiple Stow Directories</a>
<li><a name="toc_Target-Maintenance" href="Target-Maintenance.html#Target-Maintenance">10 Target Maintenance</a>
<li><a name="toc_Resource-Files" href="Resource-Files.html#Resource-Files">11 Resource Files</a>
<li><a name="toc_Compile_002dtime-vs-Install_002dtime" href="Compile_002dtime-vs-Install_002dtime.html#Compile_002dtime-vs-Install_002dtime">12 Compile-time vs Install-time</a>
<ul>
<li><a href="Compile_002dtime-vs-Install_002dtime.html#Compile_002dtime-vs-Install_002dtime">12.1 Advice on changing compilation and installation parameters</a>
<li><a href="GNU-Emacs.html#GNU-Emacs">12.2 GNU Emacs</a>
<li><a href="Other-FSF-Software.html#Other-FSF-Software">12.3 Other FSF Software</a>
<li><a href="Cygnus-Software.html#Cygnus-Software">12.4 Cygnus Software</a>
<li><a href="Perl-and-Perl-5-Modules.html#Perl-and-Perl-5-Modules">12.5 Perl and Perl 5 Modules</a>
</li></ul>
<li><a name="toc_Bootstrapping" href="Bootstrapping.html#Bootstrapping">13 Bootstrapping</a>
<li><a name="toc_Reporting-Bugs" href="Reporting-Bugs.html#Reporting-Bugs">14 Reporting Bugs</a>
<li><a name="toc_Known-Bugs" href="Known-Bugs.html#Known-Bugs">15 Known Bugs</a>
<li><a name="toc_GNU-General-Public-License" href="GNU-General-Public-License.html#GNU-General-Public-License">GNU General Public License</a>
<ul>
<li><a href="GNU-General-Public-License.html#GNU-General-Public-License">Preamble</a>
<li><a href="GNU-General-Public-License.html#GNU-General-Public-License">How to Apply These Terms to Your New Programs</a>
</li></ul>
<li><a name="toc_Index" href="Index.html#Index">Index</a>
</li></ul>
</div>
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<div class="node">
<a name="Top"></a>
<p>
Next:&nbsp;<a rel="next" accesskey="n" href="Introduction.html#Introduction">Introduction</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="../index.html#dir">(dir)</a>
<hr>
</div>
<h2 class="unnumbered">Stow</h2>
<ul class="menu">
<li><a accesskey="1" href="Introduction.html#Introduction">Introduction</a>: Description of Stow.
<li><a accesskey="2" href="Terminology.html#Terminology">Terminology</a>: Terms used by this manual.
<li><a accesskey="3" href="Invoking-Stow.html#Invoking-Stow">Invoking Stow</a>: Option summary.
<li><a accesskey="4" href="Ignore-Lists.html#Ignore-Lists">Ignore Lists</a>: Controlling what gets stowed.
<li><a accesskey="5" href="Installing-Packages.html#Installing-Packages">Installing Packages</a>: Using Stow to install.
<li><a accesskey="6" href="Deleting-Packages.html#Deleting-Packages">Deleting Packages</a>: Using Stow to uninstall.
<li><a accesskey="7" href="Conflicts.html#Conflicts">Conflicts</a>: When Stow can't stow.
<li><a accesskey="8" href="Mixing-Operations.html#Mixing-Operations">Mixing Operations</a>: Multiple actions per invocation.
<li><a accesskey="9" href="Multiple-Stow-Directories.html#Multiple-Stow-Directories">Multiple Stow Directories</a>: Further segregating software.
<li><a href="Target-Maintenance.html#Target-Maintenance">Target Maintenance</a>: Cleaning up mistakes.
<li><a href="Resource-Files.html#Resource-Files">Resource Files</a>: Setting default command line options.
<li><a href="Compile_002dtime-vs-Install_002dtime.html#Compile_002dtime-vs-Install_002dtime">Compile-time vs Install-time</a>: Faking out `make install'.
<li><a href="Bootstrapping.html#Bootstrapping">Bootstrapping</a>: When stow and perl are not yet stowed.
<li><a href="Reporting-Bugs.html#Reporting-Bugs">Reporting Bugs</a>: How, what, where, and when to report.
<li><a href="Known-Bugs.html#Known-Bugs">Known Bugs</a>: Don't report any of these.
<li><a href="GNU-General-Public-License.html#GNU-General-Public-License">GNU General Public License</a>: Copying terms.
<li><a href="Index.html#Index">Index</a>: Index of concepts.
</li></ul>
<p>--- The Detailed Node Listing ---
<p>Ignore Lists
</p>
<ul class="menu">
<li><a href="Motivation-For-Ignore-Lists.html#Motivation-For-Ignore-Lists">Motivation For Ignore Lists</a>
<li><a href="Types-And-Syntax-Of-Ignore-Lists.html#Types-And-Syntax-Of-Ignore-Lists">Types And Syntax Of Ignore Lists</a>
<li><a href="Justification-For-Yet-Another-Set-Of-Ignore-Files.html#Justification-For-Yet-Another-Set-Of-Ignore-Files">Justification For Yet Another Set Of Ignore Files</a>
</li></ul>
<p>Advice on changing compilation and installation parameters
</p>
<ul class="menu">
<li><a href="GNU-Emacs.html#GNU-Emacs">GNU Emacs</a>
<li><a href="Other-FSF-Software.html#Other-FSF-Software">Other FSF Software</a>
<li><a href="Cygnus-Software.html#Cygnus-Software">Cygnus Software</a>
<li><a href="Perl-and-Perl-5-Modules.html#Perl-and-Perl-5-Modules">Perl and Perl 5 Modules</a>
</ul>
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@set UPDATED 9 November 2015
@set UPDATED-MONTH November 2015
@set EDITION 2.2.2
@set VERSION 2.2.2

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This is the file .../info/dir, which contains the
topmost node of the Info hierarchy, called (dir)Top.
The first time you invoke Info you start off looking at this node.

File: dir, Node: Top This is the top of the INFO tree
This (the Directory node) gives a menu of major topics.
Typing "q" exits, "?" lists all Info commands, "d" returns here,
"h" gives a primer for first-timers,
"mEmacs<Return>" visits the Emacs manual, etc.
In Emacs, you can click mouse button 2 on a menu item or cross reference
to select it.
* Menu:
System administration
* Stow: (stow). GNU Stow.

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.\" ========================================================================
.\"
.IX Title "IO::FILE=IO(0X81D9F0) 1"
.TH IO::FILE=IO(0X81D9F0) 1 "2015-11-09" "perl v5.20.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
stow \- software package installation manager
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
stow [ options ] package ...
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This manual page describes \s-1GNU\s0 Stow 2.2.2, a program for managing
the installation of software packages. This is not the definitive
documentation for stow; for that, see the info manual.
.PP
Stow is a tool for managing the installation of multiple software
packages in the same run-time directory tree. One historical
difficulty of this task has been the need to administer, upgrade,
install, and remove files in independent packages without confusing
them with other files sharing the same filesystem space. For instance,
it is common to install Perl and Emacs in \fI/usr/local\fR. When one
does so, one winds up (as of Perl 4.036 and Emacs 19.22) with the
following files in \fI/usr/local/man/man1\fR: \fIa2p.1\fR; \fIctags.1\fR;
\&\fIemacs.1\fR; \fIetags.1\fR; \fIh2ph.1\fR; \fIperl.1\fR; and \fIs2p.1\fR. Now
suppose it's time to uninstall Perl. Which man pages get removed?
Obviously \fIperl.1\fR is one of them, but it should not be the
administrator's responsibility to memorize the ownership of individual
files by separate packages.
.PP
The approach used by Stow is to install each package into its own
tree, then use symbolic links to make it appear as though the files
are installed in the common tree. Administration can be performed in
the package's private tree in isolation from clutter from other
packages. Stow can then be used to update the symbolic links. The
structure of each private tree should reflect the desired structure in
the common tree; i.e. (in the typical case) there should be a \fIbin\fR
directory containing executables, a \fIman/man1\fR directory containing
section 1 man pages, and so on.
.PP
Stow was inspired by Carnegie Mellon's Depot program, but is
substantially simpler and safer. Whereas Depot required database files
to keep things in sync, Stow stores no extra state between runs, so
there's no danger (as there was in Depot) of mangling directories when
file hierarchies don't match the database. Also unlike Depot, Stow
will never delete any files, directories, or links that appear in a
Stow directory (e.g., \fI/usr/local/stow/emacs\fR), so it's always
possible to rebuild the target tree (e.g., \fI/usr/local\fR).
.SH "TERMINOLOGY"
.IX Header "TERMINOLOGY"
A \*(L"package\*(R" is a related collection of files and directories that
you wish to administer as a unit \*(-- e.g., Perl or Emacs \*(-- and that
needs to be installed in a particular directory structure \*(-- e.g.,
with \fIbin\fR, \fIlib\fR, and \fIman\fR subdirectories.
.PP
A \*(L"target directory\*(R" is the root of a tree in which one or more
packages wish to \fBappear\fR to be installed. A common, but by no means
the only such location is \fI/usr/local\fR. The examples in this manual
page will use \fI/usr/local\fR as the target directory.
.PP
A \*(L"stow directory\*(R" is the root of a tree containing separate
packages in private subtrees. When Stow runs, it uses the current
directory as the default stow directory. The examples in this manual
page will use \fI/usr/local/stow\fR as the stow directory, so that
individual packages will be, for example, \fI/usr/local/stow/perl\fR and
\&\fI/usr/local/stow/emacs\fR.
.PP
An \*(L"installation image\*(R" is the layout of files and directories
required by a package, relative to the target directory. Thus, the
installation image for Perl includes: a \fIbin\fR directory containing
\&\fIperl\fR and \fIa2p\fR (among others); an \fIinfo\fR directory containing
Texinfo documentation; a \fIlib/perl\fR directory containing Perl
libraries; and a \fIman/man1\fR directory containing man pages.
.PP
A \*(L"package directory\*(R" is the root of a tree containing the
installation image for a particular package. Each package directory
must reside in a stow directory \*(-- e.g., the package directory
\&\fI/usr/local/stow/perl\fR must reside in the stow directory
\&\fI/usr/local/stow\fR. The \*(L"name\*(R" of a package is the name of its
directory within the stow directory \*(-- e.g., \fIperl\fR.
.PP
Thus, the Perl executable might reside in
\&\fI/usr/local/stow/perl/bin/perl\fR, where \fI/usr/local\fR is the target
directory, \fI/usr/local/stow\fR is the stow directory,
\&\fI/usr/local/stow/perl\fR is the package directory, and \fIbin/perl\fR
within is part of the installation image.
.PP
A \*(L"symlink\*(R" is a symbolic link. A symlink can be \*(L"relative\*(R" or
\&\*(L"absolute\*(R". An absolute symlink names a full path; that is, one
starting from \fI/\fR. A relative symlink names a relative path; that
is, one not starting from \fI/\fR. The target of a relative symlink is
computed starting from the symlink's own directory. Stow only creates
relative symlinks.
.SH "OPTIONS"
.IX Header "OPTIONS"
The stow directory is assumed to be the value of the \f(CW\*(C`STOW_DIR\*(C'\fR
environment variable or if unset the current directory, and the target
directory is assumed to be the parent of the current directory (so it
is typical to execute \fIstow\fR from the directory \fI/usr/local/stow\fR).
Each \fIpackage\fR given on the command line is the name of a package in
the stow directory (e.g., \fIperl\fR). By default, they are installed
into the target directory (but they can be deleted instead using
\&\f(CW\*(C`\-D\*(C'\fR).
.IP "\-n" 4
.IX Item "-n"
.PD 0
.IP "\-\-no" 4
.IX Item "--no"
.PD
Do not perform any operations that modify the filesystem; merely show
what would happen.
.IP "\-d \s-1DIR\s0" 4
.IX Item "-d DIR"
.PD 0
.IP "\-\-dir=DIR" 4
.IX Item "--dir=DIR"
.PD
Set the stow directory to \f(CW\*(C`DIR\*(C'\fR instead of the current directory.
This also has the effect of making the default target directory be the
parent of \f(CW\*(C`DIR\*(C'\fR.
.IP "\-t \s-1DIR\s0" 4
.IX Item "-t DIR"
.PD 0
.IP "\-\-target=DIR" 4
.IX Item "--target=DIR"
.PD
Set the target directory to \f(CW\*(C`DIR\*(C'\fR instead of the parent of the stow
directory.
.IP "\-v" 4
.IX Item "-v"
.PD 0
.IP "\-\-verbose[=N]" 4
.IX Item "--verbose[=N]"
.PD
Send verbose output to standard error describing what Stow is
doing. Verbosity levels are 0, 1, 2, 3, and 4; 0 is the default.
Using \f(CW\*(C`\-v\*(C'\fR or \f(CW\*(C`\-\-verbose\*(C'\fR increases the verbosity by one; using
`\-\-verbose=N' sets it to N.
.IP "\-S" 4
.IX Item "-S"
.PD 0
.IP "\-\-stow" 4
.IX Item "--stow"
.PD
Stow the packages that follow this option into the target directory.
This is the default action and so can be omitted if you are only
stowing packages rather than performing a mixture of
stow/delete/restow actions.
.IP "\-D" 4
.IX Item "-D"
.PD 0
.IP "\-\-delete" 4
.IX Item "--delete"
.PD
Unstow the packages that follow this option from the target directory rather
than installing them.
.IP "\-R" 4
.IX Item "-R"
.PD 0
.IP "\-\-restow" 4
.IX Item "--restow"
.PD
Restow packages (first unstow, then stow again). This is useful
for pruning obsolete symlinks from the target tree after updating
the software in a package.
.IP "\-\-adopt" 4
.IX Item "--adopt"
\&\fBWarning!\fR This behaviour is specifically intended to alter the
contents of your stow directory. If you do not want that, this option
is not for you.
.Sp
When stowing, if a target is encountered which already exists but is a
plain file (and hence not owned by any existing stow package), then
normally Stow will register this as a conflict and refuse to proceed.
This option changes that behaviour so that the file is moved to the
same relative place within the package's installation image within the
stow directory, and then stowing proceeds as before. So effectively,
the file becomes adopted by the stow package, without its contents
changing.
.IP "\-\-no\-folding" 4
.IX Item "--no-folding"
Disable folding of newly stowed directories when stowing, and
refolding of newly foldable directories when unstowing.
.IP "\-\-ignore=REGEX" 4
.IX Item "--ignore=REGEX"
Ignore files ending in this Perl regex.
.IP "\-\-defer=REGEX" 4
.IX Item "--defer=REGEX"
Don't stow files beginning with this Perl regex if the file is already
stowed to another package.
.IP "\-\-override=REGEX" 4
.IX Item "--override=REGEX"
Force stowing files beginning with this Perl regex if the file is
already stowed to another package.
.IP "\-V" 4
.IX Item "-V"
.PD 0
.IP "\-\-version" 4
.IX Item "--version"
.PD
Show Stow version number, and exit.
.IP "\-h" 4
.IX Item "-h"
.PD 0
.IP "\-\-help" 4
.IX Item "--help"
.PD
Show Stow command syntax, and exit.
.SH "INSTALLING PACKAGES"
.IX Header "INSTALLING PACKAGES"
The default action of Stow is to install a package. This means
creating symlinks in the target tree that point into the package tree.
Stow attempts to do this with as few symlinks as possible; in other
words, if Stow can create a single symlink that points to an entire
subtree within the package tree, it will choose to do that rather than
create a directory in the target tree and populate it with symlinks.
.PP
For example, suppose that no packages have yet been installed in
\&\fI/usr/local\fR; it's completely empty (except for the \fIstow\fR
subdirectory, of course). Now suppose the Perl package is installed.
Recall that it includes the following directories in its installation
image: \fIbin\fR; \fIinfo\fR; \fIlib/perl\fR; \fIman/man1\fR. Rather than
creating the directory \fI/usr/local/bin\fR and populating it with
symlinks to \fI../stow/perl/bin/perl\fR and \fI../stow/perl/bin/a2p\fR (and
so on), Stow will create a single symlink, \fI/usr/local/bin\fR, which
points to \fIstow/perl/bin\fR. In this way, it still works to refer to
\&\fI/usr/local/bin/perl\fR and \fI/usr/local/bin/a2p\fR, and fewer symlinks
have been created. This is called \*(L"tree folding\*(R", since an entire
subtree is \*(L"folded\*(R" into a single symlink.
.PP
To complete this example, Stow will also create the symlink
\&\fI/usr/local/info\fR pointing to \fIstow/perl/info\fR; the symlink
\&\fI/usr/local/lib\fR pointing to \fIstow/perl/lib\fR; and the symlink
\&\fI/usr/local/man\fR pointing to \fIstow/perl/man\fR.
.PP
Now suppose that instead of installing the Perl package into an empty
target tree, the target tree is not empty to begin with. Instead, it
contains several files and directories installed under a different
system-administration philosophy. In particular, \fI/usr/local/bin\fR
already exists and is a directory, as are \fI/usr/local/lib\fR and
\&\fI/usr/local/man/man1\fR. In this case, Stow will descend into
\&\fI/usr/local/bin\fR and create symlinks to \fI../stow/perl/bin/perl\fR and
\&\fI../stow/perl/bin/a2p\fR (etc.), and it will descend into
\&\fI/usr/local/lib\fR and create the tree-folding symlink \fIperl\fR pointing
to \fI../stow/perl/lib/perl\fR, and so on. As a rule, Stow only descends
as far as necessary into the target tree when it can create a
tree-folding symlink.
.PP
The time often comes when a tree-folding symlink has to be undone
because another package uses one or more of the folded subdirectories
in its installation image. This operation is called \*(L"splitting open\*(R"
a folded tree. It involves removing the original symlink from the
target tree, creating a true directory in its place, and then
populating the new directory with symlinks to the newly-installed
package \fBand\fR to the old package that used the old symlink. For
example, suppose that after installing Perl into an empty
\&\fI/usr/local\fR, we wish to install Emacs. Emacs's installation image
includes a \fIbin\fR directory containing the \fIemacs\fR and \fIetags\fR
executables, among others. Stow must make these files appear to be
installed in \fI/usr/local/bin\fR, but presently \fI/usr/local/bin\fR is a
symlink to \fIstow/perl/bin\fR. Stow therefore takes the following
steps: the symlink \fI/usr/local/bin\fR is deleted; the directory
\&\fI/usr/local/bin\fR is created; links are made from \fI/usr/local/bin\fR to
\&\fI../stow/emacs/bin/emacs\fR and \fI../stow/emacs/bin/etags\fR; and links
are made from \fI/usr/local/bin\fR to \fI../stow/perl/bin/perl\fR and
\&\fI../stow/perl/bin/a2p\fR.
.PP
When splitting open a folded tree, Stow makes sure that the symlink
it is about to remove points inside a valid package in the current stow
directory.
.SS "Stow will never delete anything that it doesn't own."
.IX Subsection "Stow will never delete anything that it doesn't own."
Stow \*(L"owns\*(R" everything living in the target tree that points into a
package in the stow directory. Anything Stow owns, it can recompute if
lost. Note that by this definition, Stow doesn't \*(L"own\*(R" anything
\&\fBin\fR the stow directory or in any of the packages.
.PP
If Stow needs to create a directory or a symlink in the target tree
and it cannot because that name is already in use and is not owned by
Stow, then a conflict has arisen. See the \*(L"Conflicts\*(R" section in the
info manual.
.SH "DELETING PACKAGES"
.IX Header "DELETING PACKAGES"
When the \f(CW\*(C`\-D\*(C'\fR option is given, the action of Stow is to delete a
package from the target tree. Note that Stow will not delete anything
it doesn't \*(L"own\*(R". Deleting a package does \fBnot\fR mean removing it from
the stow directory or discarding the package tree.
.PP
To delete a package, Stow recursively scans the target tree, skipping
over the stow directory (since that is usually a subdirectory of the
target tree) and any other stow directories it encounters (see
\&\*(L"Multiple stow directories\*(R" in the info manual). Any symlink it
finds that points into the package being deleted is removed. Any
directory that contained only symlinks to the package being deleted is
removed. Any directory that, after removing symlinks and empty
subdirectories, contains only symlinks to a single other package, is
considered to be a previously \*(L"folded\*(R" tree that was \*(L"split open.\*(R"
Stow will re-fold the tree by removing the symlinks to the surviving
package, removing the directory, then linking the directory back to
the surviving package.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
The full documentation for \fIstow\fR is maintained as a Texinfo manual.
If the \fIinfo\fR and \fIstow\fR programs are properly installed at your site, the command
.PP
.Vb 1
\& info stow
.Ve
.PP
should give you access to the complete manual.
.SH "BUGS"
.IX Header "BUGS"
Please report bugs in Stow using the Debian bug tracking system.
.PP
Currently known bugs include:
.IP "\(bu" 4
The empty-directory problem.
.Sp
If package \fIfoo\fR includes an empty directory \*(-- say, \fIfoo/bar\fR \*(--
then if no other package has a \fIbar\fR subdirectory, everything's fine.
If another stowed package \fIquux\fR, has a \fIbar\fR subdirectory, then
when stowing, \fItargetdir/bar\fR will be \*(L"split open\*(R" and the contents
of \fIquux/bar\fR will be individually stowed. So far, so good. But when
unstowing \fIquux\fR, \fItargetdir/bar\fR will be removed, even though
\&\fIfoo/bar\fR needs it to remain. A workaround for this problem is to
create a file in \fIfoo/bar\fR as a placeholder. If you name that file
\&\fI.placeholder\fR, it will be easy to find and remove such files when
this bug is fixed.
.IP "\(bu" 4
When using multiple stow directories (see \*(L"Multiple stow directories\*(R"
in the info manual), Stow fails to \*(L"split open\*(R" tree-folding symlinks
(see \*(L"Installing packages\*(R" in the info manual) that point into a stow
directory which is not the one in use by the current Stow
command. Before failing, it should search the target of the link to
see whether any element of the path contains a \fI.stow\fR file. If it
finds one, it can \*(L"learn\*(R" about the cooperating stow directory to
short-circuit the \fI.stow\fR search the next time it encounters a
tree-folding symlink.
.SH "AUTHOR"
.IX Header "AUTHOR"
This man page was originally constructed by Charles Briscoe-Smith from
parts of Stow's info manual, and then converted to \s-1POD\s0 format by Adam
Spiers. The info manual contains the following notice, which, as it
says, applies to this manual page, too. The text of the section
entitled \*(L"\s-1GNU\s0 General Public License\*(R" can be found in the file
\&\fI/usr/share/common\-licenses/GPL\fR on any Debian GNU/Linux system. If
you don't have access to a Debian system, or the \s-1GPL\s0 is not there,
write to the Free Software Foundation, Inc., 59 Temple Place, Suite
330, Boston, \s-1MA, 02111\-1307, USA.\s0
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (C)
1993, 1994, 1995, 1996 by Bob Glickstein <bobg+stow@zanshin.com>;
2000, 2001 by Guillaume Morin;
2007 by Kahlil Hodgson;
2011 by Adam Spiers;
and others.
.PP
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
.PP
Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided also that
the section entitled \*(L"\s-1GNU\s0 General Public License\*(R" is included with the
modified manual, and provided that the entire resulting derived work
is distributed under the terms of a permission notice identical to
this one.
.PP
Permission is granted to copy and distribute translations of this
manual into another language, under the above conditions for modified
versions, except that this permission notice may be stated in a
translation approved by the Free Software Foundation.

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package Stow::Util;
=head1 NAME
Stow::Util - general utilities
=head1 SYNOPSIS
use Stow::Util qw(debug set_debug_level error ...);
=head1 DESCRIPTION
Supporting utility routines for L<Stow>.
=cut
use strict;
use warnings;
use POSIX qw(getcwd);
use base qw(Exporter);
our @EXPORT_OK = qw(
error debug set_debug_level set_test_mode
join_paths parent canon_path restore_cwd
);
our $ProgramName = 'stow';
our $VERSION = '2.2.2';
#############################################################################
#
# General Utilities: nothing stow specific here.
#
#############################################################################
=head1 IMPORTABLE SUBROUTINES
=head2 error($format, @args)
Outputs an error message in a consistent form and then dies.
=cut
sub error {
my ($format, @args) = @_;
die "$ProgramName: ERROR: " . sprintf($format, @args) . "\n";
}
=head2 set_debug_level($level)
Sets verbosity level for C<debug()>.
=cut
our $debug_level = 0;
sub set_debug_level {
my ($level) = @_;
$debug_level = $level;
}
=head2 set_test_mode($on_or_off)
Sets testmode on or off.
=cut
our $test_mode = 0;
sub set_test_mode {
my ($on_or_off) = @_;
if ($on_or_off) {
$test_mode = 1;
}
else {
$test_mode = 0;
}
}
=head2 debug($level, $msg)
Logs to STDERR based on C<$debug_level> setting. C<$level> is the
minimum verbosity level required to output C<$msg>. All output is to
STDERR to preserve backward compatibility, except for in test mode,
when STDOUT is used instead. In test mode, the verbosity can be
overridden via the C<TEST_VERBOSE> environment variable.
Verbosity rules:
=over 4
=item 0: errors only
=item >= 1: print operations: LINK/UNLINK/MKDIR/RMDIR/MV
=item >= 2: print operation exceptions
e.g. "_this_ already points to _that_", skipping, deferring,
overriding, fixing invalid links
=item >= 3: print trace detail: trace: stow/unstow/package/contents/node
=item >= 4: debug helper routines
=item >= 5: debug ignore lists
=back
=cut
sub debug {
my ($level, $msg) = @_;
if ($debug_level >= $level) {
if ($test_mode) {
print "# $msg\n";
}
else {
warn "$msg\n";
}
}
}
#===== METHOD ===============================================================
# Name : join_paths()
# Purpose : concatenates given paths
# Parameters: path1, path2, ... => paths
# Returns : concatenation of given paths
# Throws : n/a
# Comments : factors out redundant path elements:
# : '//' => '/' and 'a/b/../c' => 'a/c'
#============================================================================
sub join_paths {
my @paths = @_;
# weed out empty components and concatenate
my $result = join '/', grep {! /\A\z/} @paths;
# factor out back references and remove redundant /'s)
my @result = ();
PART:
for my $part (split m{/+}, $result) {
next PART if $part eq '.';
if (@result && $part eq '..' && $result[-1] ne '..') {
pop @result;
}
else {
push @result, $part;
}
}
return join '/', @result;
}
#===== METHOD ===============================================================
# Name : parent
# Purpose : find the parent of the given path
# Parameters: @path => components of the path
# Returns : returns a path string
# Throws : n/a
# Comments : allows you to send multiple chunks of the path
# : (this feature is currently not used)
#============================================================================
sub parent {
my @path = @_;
my $path = join '/', @_;
my @elts = split m{/+}, $path;
pop @elts;
return join '/', @elts;
}
#===== METHOD ===============================================================
# Name : canon_path
# Purpose : find absolute canonical path of given path
# Parameters: $path
# Returns : absolute canonical path
# Throws : n/a
# Comments : is this significantly different from File::Spec->rel2abs?
#============================================================================
sub canon_path {
my ($path) = @_;
my $cwd = getcwd();
chdir($path) or error("canon_path: cannot chdir to $path from $cwd");
my $canon_path = getcwd();
restore_cwd($cwd);
return $canon_path;
}
sub restore_cwd {
my ($prev) = @_;
chdir($prev) or error("Your current directory $prev seems to have vanished");
}
=head1 BUGS
=head1 SEE ALSO
=cut
1;
# Local variables:
# mode: perl
# cperl-indent-level: 4
# end:
# vim: ft=perl