2176 lines
70 KiB
Perl
Executable file
2176 lines
70 KiB
Perl
Executable file
#!/usr/bin/perl
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#
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# This file is part of GNU Stow.
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#
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# GNU Stow is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# GNU Stow is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see https://www.gnu.org/licenses/.
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package Stow;
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=head1 NAME
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Stow - manage farms of symbolic links
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=head1 SYNOPSIS
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my $stow = new Stow(%$options);
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$stow->plan_unstow(@pkgs_to_unstow);
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$stow->plan_stow (@pkgs_to_stow);
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my %conflicts = $stow->get_conflicts;
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$stow->process_tasks() unless %conflicts;
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=head1 DESCRIPTION
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This is the backend Perl module for GNU Stow, a program for managing
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the installation of software packages, keeping them separate
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(C</usr/local/stow/emacs> vs. C</usr/local/stow/perl>, for example)
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while making them appear to be installed in the same place
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(C</usr/local>).
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Stow doesn't store an extra state between runs, so there's no danger
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of mangling directories when file hierarchies don't match the
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database. Also, stow will never delete any files, directories, or
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links that appear in a stow directory, so it is always possible to
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rebuild the target tree.
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=cut
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use strict;
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use warnings;
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use Carp qw(carp cluck croak confess longmess);
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use File::Copy qw(move);
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use File::Spec;
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use POSIX qw(getcwd);
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use Stow::Util qw(set_debug_level debug error set_test_mode
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join_paths restore_cwd canon_path parent adjust_dotfile);
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our $ProgramName = 'stow';
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our $VERSION = '@VERSION@';
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our $LOCAL_IGNORE_FILE = '.stow-local-ignore';
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our $GLOBAL_IGNORE_FILE = '.stow-global-ignore';
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our @default_global_ignore_regexps =
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__PACKAGE__->get_default_global_ignore_regexps();
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# These are the default options for each Stow instance.
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our %DEFAULT_OPTIONS = (
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conflicts => 0,
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simulate => 0,
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verbose => 0,
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paranoid => 0,
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compat => 0,
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test_mode => 0,
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dotfiles => 0,
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adopt => 0,
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'no-folding' => 0,
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ignore => [],
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override => [],
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defer => [],
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);
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=head1 CONSTRUCTORS
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=head2 new(%options)
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=head3 Required options
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=over 4
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=item * dir - the stow directory
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=item * target - the target directory
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=back
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=head3 Non-mandatory options
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See the documentation for the F<stow> CLI front-end for information on these.
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=over 4
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=item * conflicts
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=item * simulate
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=item * verbose
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=item * paranoid
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=item * compat
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=item * test_mode
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=item * adopt
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=item * no-folding
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=item * ignore
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=item * override
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=item * defer
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=back
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N.B. This sets the current working directory to the target directory.
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=cut
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sub new {
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my $self = shift;
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my $class = ref($self) || $self;
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my %opts = @_;
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my $new = bless { }, $class;
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$new->{action_count} = 0;
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for my $required_arg (qw(dir target)) {
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croak "$class->new() called without '$required_arg' parameter\n"
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unless exists $opts{$required_arg};
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$new->{$required_arg} = delete $opts{$required_arg};
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}
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for my $opt (keys %DEFAULT_OPTIONS) {
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$new->{$opt} = exists $opts{$opt} ? delete $opts{$opt}
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: $DEFAULT_OPTIONS{$opt};
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}
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if (%opts) {
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croak "$class->new() called with unrecognised parameter(s): ",
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join(", ", keys %opts), "\n";
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}
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set_debug_level($new->get_verbosity());
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set_test_mode($new->{test_mode});
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$new->set_stow_dir();
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$new->init_state();
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return $new;
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}
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sub get_verbosity {
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my $self = shift;
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return $self->{verbose} unless $self->{test_mode};
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return 0 unless exists $ENV{TEST_VERBOSE};
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return 0 unless length $ENV{TEST_VERBOSE};
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# Convert TEST_VERBOSE=y into numeric value
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$ENV{TEST_VERBOSE} = 3 if $ENV{TEST_VERBOSE} !~ /^\d+$/;
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return $ENV{TEST_VERBOSE};
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}
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=head2 set_stow_dir([$dir])
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Sets a new stow directory. This allows the use of multiple stow
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directories within one Stow instance, e.g.
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$stow->plan_stow('foo');
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$stow->set_stow_dir('/different/stow/dir');
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$stow->plan_stow('bar');
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$stow->process_tasks;
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If C<$dir> is omitted, uses the value of the C<dir> parameter passed
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to the L<new()> constructor.
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=cut
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sub set_stow_dir {
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my $self = shift;
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my ($dir) = @_;
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if (defined $dir) {
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$self->{dir} = $dir;
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}
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my $stow_dir = canon_path($self->{dir});
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my $target = canon_path($self->{target});
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# Calculate relative path from target directory to stow directory.
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# This will be commonly used as a prefix for constructing and
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# recognising symlinks "installed" in the target directory which
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# point to package files under the stow directory.
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$self->{stow_path} = File::Spec->abs2rel($stow_dir, $target);
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debug(2, 0, "stow dir is $stow_dir");
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debug(2, 0, "stow dir path relative to target $target is $self->{stow_path}");
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}
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sub init_state {
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my $self = shift;
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# Store conflicts during pre-processing
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$self->{conflicts} = {};
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$self->{conflict_count} = 0;
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# Store command line packages to stow (-S and -R)
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$self->{pkgs_to_stow} = [];
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# Store command line packages to unstow (-D and -R)
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$self->{pkgs_to_delete} = [];
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# The following structures are used by the abstractions that allow us to
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# defer operating on the filesystem until after all potential conflicts have
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# been assessed.
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# $self->{tasks}: list of operations to be performed (in order)
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# each element is a hash ref of the form
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# {
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# action => ... ('create' or 'remove' or 'move')
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# type => ... ('link' or 'dir' or 'file')
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# path => ... (unique)
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# source => ... (only for links)
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# dest => ... (only for moving files)
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# }
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$self->{tasks} = [];
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# $self->{dir_task_for}: map a path to the corresponding directory task reference
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# This structure allows us to quickly determine if a path has an existing
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# directory task associated with it.
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$self->{dir_task_for} = {};
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# $self->{link_task_for}: map a path to the corresponding directory task reference
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# This structure allows us to quickly determine if a path has an existing
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# directory task associated with it.
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$self->{link_task_for} = {};
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# N.B.: directory tasks and link tasks are NOT mutually exclusive due
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# to tree splitting (which involves a remove link task followed by
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# a create directory task).
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}
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=head1 METHODS
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=head2 plan_unstow(@packages)
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Plan which symlink/directory creation/removal tasks need to be executed
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in order to unstow the given packages. Any potential conflicts are then
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accessible via L<get_conflicts()>.
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=cut
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sub plan_unstow {
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my $self = shift;
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my @packages = @_;
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return unless @packages;
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debug(2, 0, "Planning unstow of: @packages ...");
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$self->within_target_do(sub {
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for my $package (@packages) {
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my $pkg_path = join_paths($self->{stow_path}, $package);
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if (not -d $pkg_path) {
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error("The stow directory $self->{stow_path} does not contain package $package");
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}
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debug(2, 0, "Planning unstow of package $package...");
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if ($self->{compat}) {
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$self->unstow_contents_orig(
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$package,
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'.',
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);
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}
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else {
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$self->unstow_contents(
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$package,
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'.',
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);
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}
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debug(2, 0, "Planning unstow of package $package... done");
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$self->{action_count}++;
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}
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});
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}
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=head2 plan_stow(@packages)
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Plan which symlink/directory creation/removal tasks need to be executed
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in order to stow the given packages. Any potential conflicts are then
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accessible via L<get_conflicts()>.
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=cut
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sub plan_stow {
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my $self = shift;
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my @packages = @_;
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return unless @packages;
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debug(2, 0, "Planning stow of: @packages ...");
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$self->within_target_do(sub {
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for my $package (@packages) {
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my $pkg_path = join_paths($self->{stow_path}, $package);
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if (not -d $pkg_path) {
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error("The stow directory $self->{stow_path} does not contain package $package");
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}
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debug(2, 0, "Planning stow of package $package...");
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$self->stow_contents(
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$self->{stow_path},
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$package,
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'.',
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$pkg_path, # source from target
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);
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debug(2, 0, "Planning stow of package $package... done");
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$self->{action_count}++;
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}
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});
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}
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#===== METHOD ===============================================================
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# Name : within_target_do()
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# Purpose : execute code within target directory, preserving cwd
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# Parameters: $code => anonymous subroutine to execute within target dir
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# Returns : n/a
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# Throws : n/a
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# Comments : This is done to ensure that the consumer of the Stow interface
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# : doesn't have to worry about (a) what their cwd is, and
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# : (b) that their cwd might change.
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#============================================================================
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sub within_target_do {
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my $self = shift;
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my ($code) = @_;
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my $cwd = getcwd();
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chdir($self->{target})
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or error("Cannot chdir to target tree: $self->{target} ($!)");
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debug(3, 0, "cwd now $self->{target}");
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$self->$code();
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restore_cwd($cwd);
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debug(3, 0, "cwd restored to $cwd");
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}
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#===== METHOD ===============================================================
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# Name : stow_contents()
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# Purpose : stow the contents of the given directory
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# Parameters: $stow_path => relative path from current (i.e. target) directory
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# : to the stow dir containing the package to be stowed.
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# : This can differ from $self->{stow_path} when unfolding
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# : a (sub)tree which is already stowed from a package
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# : in a different stow directory (see the "Multiple Stow
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# : Directories" section of the manual).
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# : $package => the package whose contents are being stowed
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# : $target => subpath relative to package directory which needs
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# : stowing as a symlink at subpath relative to target
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# : directory.
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# : $source => relative path from the (sub)dir of target
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# : to symlink source
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# Returns : n/a
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# Throws : a fatal error if directory cannot be read
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# Comments : stow_node() and stow_contents() are mutually recursive.
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# : $source and $target are used for creating the symlink
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# : $path is used for folding/unfolding trees as necessary
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#============================================================================
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sub stow_contents {
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my $self = shift;
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my ($stow_path, $package, $target, $source) = @_;
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# Calculate the path to the package directory or sub-directory
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# whose contents need to be stowed, relative to the current
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# (target directory). This is needed so that we can check it's a
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# valid directory, and can read its contents to iterate over them.
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#
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# Note that $source refers to the same package (sub-)directory,
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# but instead it's relative to the target directory or
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# sub-directory where the symlink will be installed when the plans
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# are executed.
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my $path = join_paths($stow_path, $package, $target);
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return if $self->should_skip_target_which_is_stow_dir($target);
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my $cwd = getcwd();
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my $msg = "Stowing contents of $path (cwd=$cwd)";
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$msg =~ s!$ENV{HOME}(/|$)!~$1!g;
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debug(3, 0, $msg);
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debug(4, 1, "=> $source");
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error("stow_contents() called with non-directory package path: $path")
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unless -d $path;
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error("stow_contents() called with non-directory target: $target")
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unless $self->is_a_node($target);
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opendir my $DIR, $path
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or error("cannot read directory: $path ($!)");
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my @listing = readdir $DIR;
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closedir $DIR;
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NODE:
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for my $node (@listing) {
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next NODE if $node eq '.';
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next NODE if $node eq '..';
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my $node_target = join_paths($target, $node);
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next NODE if $self->ignore($stow_path, $package, $node_target);
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if ($self->{dotfiles}) {
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my $adj_node_target = adjust_dotfile($node_target);
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debug(4, 1, "Adjusting: $node_target => $adj_node_target");
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$node_target = $adj_node_target;
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}
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$self->stow_node(
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$stow_path,
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$package,
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$node_target, # target, potentially adjusted for dot- prefix
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join_paths($source, $node), # source
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);
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}
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}
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#===== METHOD ===============================================================
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# Name : stow_node()
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# Purpose : stow the given node
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# Parameters: $stow_path => relative path from current (i.e. target) directory
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# : to the stow dir containing the node to be stowed
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# : $package => the package containing the node being stowed
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# : $target => subpath relative to package directory of node which
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# : needs stowing as a symlink at subpath relative to
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# : target directory.
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# : $source => relative path to symlink source from the dir of target
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# Returns : n/a
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# Throws : fatal exception if a conflict arises
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# Comments : stow_node() and stow_contents() are mutually recursive.
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# : $source and $target are used for creating the symlink
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# : $path is used for folding/unfolding trees as necessary
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#============================================================================
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sub stow_node {
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my $self = shift;
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my ($stow_path, $package, $target, $source) = @_;
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my $path = join_paths($stow_path, $package, $target);
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debug(3, 0, "Stowing entry $stow_path / $package / $target");
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debug(4, 1, "=> $source");
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# Don't try to stow absolute symlinks (they can't be unstowed)
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if (-l $source) {
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my $second_source = $self->read_a_link($source);
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if ($second_source =~ m{\A/}) {
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$self->conflict(
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'stow',
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$package,
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"source is an absolute symlink $source => $second_source"
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);
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debug(3, 0, "Absolute symlinks cannot be unstowed");
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return;
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}
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}
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# Does the target already exist?
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if ($self->is_a_link($target)) {
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# Where is the link pointing?
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my $existing_source = $self->read_a_link($target);
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if (not $existing_source) {
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error("Could not read link: $target");
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}
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debug(4, 1, "Evaluate existing link: $target => $existing_source");
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# Does it point to a node under any stow directory?
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my ($existing_path, $existing_stow_path, $existing_package) =
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$self->find_stowed_path($target, $existing_source);
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if (not $existing_path) {
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$self->conflict(
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'stow',
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$package,
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"existing target is not owned by stow: $target"
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);
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return; # XXX #
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}
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# Does the existing $target actually point to anything?
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if ($self->is_a_node($existing_path)) {
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if ($existing_source eq $source) {
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debug(2, 0, "--- Skipping $target as it already points to $source");
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}
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elsif ($self->defer($target)) {
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debug(2, 0, "--- Deferring installation of: $target");
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}
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elsif ($self->override($target)) {
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debug(2, 0, "--- Overriding installation of: $target");
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$self->do_unlink($target);
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$self->do_link($source, $target);
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}
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elsif ($self->is_a_dir(join_paths(parent($target), $existing_source)) &&
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$self->is_a_dir(join_paths(parent($target), $source)) ) {
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# If the existing link points to a directory,
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# and the proposed new link points to a directory,
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# then we can unfold (split open) the tree at that point
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debug(2, 0, "--- Unfolding $target which was already owned by $existing_package");
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$self->do_unlink($target);
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$self->do_mkdir($target);
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$self->stow_contents(
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$existing_stow_path,
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$existing_package,
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$target,
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join_paths('..', $existing_source),
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);
|
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$self->stow_contents(
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$self->{stow_path},
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$package,
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$target,
|
|
join_paths('..', $source),
|
|
);
|
|
}
|
|
else {
|
|
$self->conflict(
|
|
'stow',
|
|
$package,
|
|
"existing target is stowed to a different package: "
|
|
. "$target => $existing_source"
|
|
);
|
|
}
|
|
}
|
|
else {
|
|
# The existing link is invalid, so replace it with a good link
|
|
debug(2, 0, "--- replacing invalid link: $path");
|
|
$self->do_unlink($target);
|
|
$self->do_link($source, $target);
|
|
}
|
|
}
|
|
elsif ($self->is_a_node($target)) {
|
|
debug(4, 1, "Evaluate existing node: $target");
|
|
if ($self->is_a_dir($target)) {
|
|
$self->stow_contents(
|
|
$self->{stow_path},
|
|
$package,
|
|
$target,
|
|
join_paths('..', $source),
|
|
);
|
|
}
|
|
else {
|
|
if ($self->{adopt}) {
|
|
$self->do_mv($target, $path);
|
|
$self->do_link($source, $target);
|
|
}
|
|
else {
|
|
$self->conflict(
|
|
'stow',
|
|
$package,
|
|
"existing target is neither a link nor a directory: $target"
|
|
);
|
|
}
|
|
}
|
|
}
|
|
elsif ($self->{'no-folding'} && -d $path && ! -l $path) {
|
|
$self->do_mkdir($target);
|
|
$self->stow_contents(
|
|
$self->{stow_path},
|
|
$package,
|
|
$target,
|
|
join_paths('..', $source),
|
|
);
|
|
}
|
|
else {
|
|
$self->do_link($source, $target);
|
|
}
|
|
return;
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : should_skip_target_which_is_stow_dir()
|
|
# Purpose : determine whether target is a stow directory which should
|
|
# : not be stowed to or unstowed from
|
|
# Parameters: $target => relative path to symlink target from the current directory
|
|
# Returns : true iff target is a stow directory
|
|
# Throws : n/a
|
|
# Comments : none
|
|
#============================================================================
|
|
sub should_skip_target_which_is_stow_dir {
|
|
my $self = shift;
|
|
my ($target) = @_;
|
|
|
|
# Don't try to remove anything under a stow directory
|
|
if ($target eq $self->{stow_path}) {
|
|
warn "WARNING: skipping target which was current stow directory $target\n";
|
|
return 1;
|
|
}
|
|
|
|
if ($self->marked_stow_dir($target)) {
|
|
warn "WARNING: skipping protected directory $target\n";
|
|
return 1;
|
|
}
|
|
|
|
debug(4, 1, "$target not protected");
|
|
return 0;
|
|
}
|
|
|
|
sub marked_stow_dir {
|
|
my $self = shift;
|
|
my ($target) = @_;
|
|
for my $f (".stow", ".nonstow") {
|
|
if (-e join_paths($target, $f)) {
|
|
debug(4, 2, "$target contained $f");
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : unstow_contents_orig()
|
|
# Purpose : unstow the contents of the given directory
|
|
# Parameters: $package => the package whose contents are being unstowed
|
|
# : $target => relative path to symlink target from the current directory
|
|
# Returns : n/a
|
|
# Throws : a fatal error if directory cannot be read
|
|
# Comments : unstow_node_orig() and unstow_contents_orig() are mutually recursive
|
|
# : Here we traverse the target tree, rather than the source tree.
|
|
#============================================================================
|
|
sub unstow_contents_orig {
|
|
my $self = shift;
|
|
my ($package, $target) = @_;
|
|
|
|
my $path = join_paths($self->{stow_path}, $package, $target);
|
|
|
|
return if $self->should_skip_target_which_is_stow_dir($target);
|
|
|
|
my $cwd = getcwd();
|
|
my $msg = "Unstowing from $target (compat mode, cwd=$cwd, stow dir=$self->{stow_path})";
|
|
$msg =~ s!$ENV{HOME}(/|$)!~$1!g;
|
|
debug(3, 0, $msg);
|
|
debug(4, 1, "source path is $path");
|
|
# In compat mode we traverse the target tree not the source tree,
|
|
# so we're unstowing the contents of /target/foo, there's no
|
|
# guarantee that the corresponding /stow/mypkg/foo exists.
|
|
error("unstow_contents_orig() called with non-directory target: $target")
|
|
unless -d $target;
|
|
|
|
opendir my $DIR, $target
|
|
or error("cannot read directory: $target ($!)");
|
|
my @listing = readdir $DIR;
|
|
closedir $DIR;
|
|
|
|
NODE:
|
|
for my $node (@listing) {
|
|
next NODE if $node eq '.';
|
|
next NODE if $node eq '..';
|
|
my $node_target = join_paths($target, $node);
|
|
next NODE if $self->ignore($self->{stow_path}, $package, $node_target);
|
|
$self->unstow_node_orig($package, $node_target);
|
|
}
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : unstow_node_orig()
|
|
# Purpose : unstow the given node
|
|
# Parameters: $package => the package containing the node being stowed
|
|
# : $target => relative path to symlink target from the current directory
|
|
# Returns : n/a
|
|
# Throws : fatal error if a conflict arises
|
|
# Comments : unstow_node() and unstow_contents() are mutually recursive
|
|
#============================================================================
|
|
sub unstow_node_orig {
|
|
my $self = shift;
|
|
my ($package, $target) = @_;
|
|
|
|
my $path = join_paths($self->{stow_path}, $package, $target);
|
|
|
|
debug(3, 0, "Unstowing $target (compat mode)");
|
|
debug(4, 1, "source path is $path");
|
|
|
|
# Does the target exist?
|
|
if ($self->is_a_link($target)) {
|
|
debug(4, 1, "Evaluate existing link: $target");
|
|
|
|
# Where is the link pointing?
|
|
my $existing_source = $self->read_a_link($target);
|
|
if (not $existing_source) {
|
|
error("Could not read link: $target");
|
|
}
|
|
|
|
# Does it point to a node under any stow directory?
|
|
my ($existing_path, $existing_stow_path, $existing_package) =
|
|
$self->find_stowed_path($target, $existing_source);
|
|
if (not $existing_path) {
|
|
# We're traversing the target tree not the package tree,
|
|
# so we definitely expect to find stuff not owned by stow.
|
|
# Therefore we can't flag a conflict.
|
|
return; # XXX #
|
|
}
|
|
|
|
# Does the existing $target actually point to anything?
|
|
if (-e $existing_path) {
|
|
# Does link point to the right place?
|
|
if ($existing_path eq $path) {
|
|
$self->do_unlink($target);
|
|
}
|
|
elsif ($self->override($target)) {
|
|
debug(2, 0, "--- overriding installation of: $target");
|
|
$self->do_unlink($target);
|
|
}
|
|
# else leave it alone
|
|
}
|
|
else {
|
|
debug(2, 0, "--- removing invalid link into a stow directory: $path");
|
|
$self->do_unlink($target);
|
|
}
|
|
}
|
|
elsif (-d $target) {
|
|
$self->unstow_contents_orig($package, $target);
|
|
|
|
# This action may have made the parent directory foldable
|
|
if (my $parent = $self->foldable($target)) {
|
|
$self->fold_tree($target, $parent);
|
|
}
|
|
}
|
|
elsif (-e $target) {
|
|
$self->conflict(
|
|
'unstow',
|
|
$package,
|
|
"existing target is neither a link nor a directory: $target",
|
|
);
|
|
}
|
|
else {
|
|
debug(2, 0, "$target did not exist to be unstowed");
|
|
}
|
|
return;
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : unstow_contents()
|
|
# Purpose : unstow the contents of the given directory
|
|
# Parameters: $package => the package whose contents are being unstowed
|
|
# : $target => relative path to symlink target from the current directory
|
|
# Returns : n/a
|
|
# Throws : a fatal error if directory cannot be read
|
|
# Comments : unstow_node() and unstow_contents() are mutually recursive
|
|
# : Here we traverse the source tree, rather than the target tree.
|
|
#============================================================================
|
|
sub unstow_contents {
|
|
my $self = shift;
|
|
my ($package, $target) = @_;
|
|
|
|
my $path = join_paths($self->{stow_path}, $package, $target);
|
|
|
|
return if $self->should_skip_target_which_is_stow_dir($target);
|
|
|
|
my $cwd = getcwd();
|
|
my $msg = "Unstowing from $target (cwd=$cwd, stow dir=$self->{stow_path})";
|
|
$msg =~ s!$ENV{HOME}/!~/!g;
|
|
debug(3, 0, $msg);
|
|
debug(4, 1, "source path is $path");
|
|
# We traverse the source tree not the target tree, so $path must exist.
|
|
error("unstow_contents() called with non-directory path: $path")
|
|
unless -d $path;
|
|
# When called at the top level, $target should exist. And
|
|
# unstow_node() should only call this via mutual recursion if
|
|
# $target exists.
|
|
error("unstow_contents() called with invalid target: $target")
|
|
unless $self->is_a_node($target);
|
|
|
|
opendir my $DIR, $path
|
|
or error("cannot read directory: $path ($!)");
|
|
my @listing = readdir $DIR;
|
|
closedir $DIR;
|
|
|
|
NODE:
|
|
for my $node (@listing) {
|
|
next NODE if $node eq '.';
|
|
next NODE if $node eq '..';
|
|
my $node_target = join_paths($target, $node);
|
|
next NODE if $self->ignore($self->{stow_path}, $package, $node_target);
|
|
|
|
if ($self->{dotfiles}) {
|
|
my $adj_node_target = adjust_dotfile($node_target);
|
|
debug(4, 1, "Adjusting: $node_target => $adj_node_target");
|
|
$node_target = $adj_node_target;
|
|
}
|
|
|
|
$self->unstow_node($package, $node_target);
|
|
}
|
|
if (-d $target) {
|
|
$self->cleanup_invalid_links($target);
|
|
}
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : unstow_node()
|
|
# Purpose : unstow the given node
|
|
# Parameters: $package => the package containing the node being unstowed
|
|
# : $target => relative path to symlink target from the current directory
|
|
# Returns : n/a
|
|
# Throws : fatal error if a conflict arises
|
|
# Comments : unstow_node() and unstow_contents() are mutually recursive
|
|
#============================================================================
|
|
sub unstow_node {
|
|
my $self = shift;
|
|
my ($package, $target) = @_;
|
|
|
|
my $path = join_paths($self->{stow_path}, $package, $target);
|
|
|
|
debug(3, 1, "Unstowing $path");
|
|
debug(4, 2, "target is $target");
|
|
|
|
# Does the target exist?
|
|
if ($self->is_a_link($target)) {
|
|
debug(4, 2, "Evaluate existing link: $target");
|
|
|
|
# Where is the link pointing?
|
|
my $existing_source = $self->read_a_link($target);
|
|
if (not $existing_source) {
|
|
error("Could not read link: $target");
|
|
}
|
|
|
|
if ($existing_source =~ m{\A/}) {
|
|
warn "Ignoring an absolute symlink: $target => $existing_source\n";
|
|
return; # XXX #
|
|
}
|
|
|
|
# Does it point to a node under any stow directory?
|
|
my ($existing_path, $existing_stow_path, $existing_package) =
|
|
$self->find_stowed_path($target, $existing_source);
|
|
if (not $existing_path) {
|
|
$self->conflict(
|
|
'unstow',
|
|
$package,
|
|
"existing target is not owned by stow: $target => $existing_source"
|
|
);
|
|
return; # XXX #
|
|
}
|
|
|
|
# Does the existing $target actually point to anything?
|
|
if (-e $existing_path) {
|
|
# Does link points to the right place?
|
|
|
|
# Adjust for dotfile if necessary.
|
|
if ($self->{dotfiles}) {
|
|
$existing_path = adjust_dotfile($existing_path);
|
|
}
|
|
|
|
if ($existing_path eq $path) {
|
|
$self->do_unlink($target);
|
|
}
|
|
|
|
# XXX we quietly ignore links that are stowed to a different
|
|
# package.
|
|
|
|
#elsif (defer($target)) {
|
|
# debug(2, 0, "--- deferring to installation of: $target");
|
|
#}
|
|
#elsif ($self->override($target)) {
|
|
# debug(2, 0, "--- overriding installation of: $target");
|
|
# $self->do_unlink($target);
|
|
#}
|
|
#else {
|
|
# $self->conflict(
|
|
# 'unstow',
|
|
# $package,
|
|
# "existing target is stowed to a different package: "
|
|
# . "$target => $existing_source"
|
|
# );
|
|
#}
|
|
}
|
|
else {
|
|
debug(2, 0, "--- removing invalid link into a stow directory: $path");
|
|
$self->do_unlink($target);
|
|
}
|
|
}
|
|
elsif (-e $target) {
|
|
debug(4, 2, "Evaluate existing node: $target");
|
|
if (-d $target) {
|
|
$self->unstow_contents($package, $target);
|
|
|
|
# This action may have made the parent directory foldable
|
|
if (my $parent = $self->foldable($target)) {
|
|
$self->fold_tree($target, $parent);
|
|
}
|
|
}
|
|
else {
|
|
$self->conflict(
|
|
'unstow',
|
|
$package,
|
|
"existing target is neither a link nor a directory: $target",
|
|
);
|
|
}
|
|
}
|
|
else {
|
|
debug(2, 1, "$target did not exist to be unstowed");
|
|
}
|
|
return;
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : link_owned_by_package()
|
|
# Purpose : determine whether the given link points to a member of a
|
|
# : stowed package
|
|
# Parameters: $target => path to a symbolic link under current directory
|
|
# : $source => where that link points to
|
|
# Returns : the package iff link is owned by stow, otherwise ''
|
|
# Throws : n/a
|
|
# Comments : lossy wrapper around find_stowed_path()
|
|
#============================================================================
|
|
sub link_owned_by_package {
|
|
my $self = shift;
|
|
my ($target, $source) = @_;
|
|
|
|
my ($path, $stow_path, $package) =
|
|
$self->find_stowed_path($target, $source);
|
|
return $package;
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : find_stowed_path()
|
|
# Purpose : determine whether the given link within the target directory
|
|
# : is a stowed path pointing to a member of a package under the
|
|
# : stow dir, and if so, obtain a breakdown of information about
|
|
# : this stowed path.
|
|
# Parameters: $target => path to a symbolic link under current directory.
|
|
# : Must share a common prefix with $self->{stow_path}
|
|
# : $source => where that link points to (needed because link
|
|
# : might not exist yet due to two-phase approach,
|
|
# : so we can't just call readlink()). This must be
|
|
# : expressed relative to (the directory containing)
|
|
# : $target.
|
|
# Returns : ($path, $stow_path, $package) where $path and $stow_path are
|
|
# : relative from the current (i.e. target) directory. $path
|
|
# : is the full relative path, $stow_path is the relative path
|
|
# : to the stow directory, and $package is the name of the package.
|
|
# : or ('', '', '') if link is not owned by stow
|
|
# Throws : n/a
|
|
# Comments : Allow for stow dir not being under target dir.
|
|
# : We could put more logic under here for multiple stow dirs.
|
|
#============================================================================
|
|
sub find_stowed_path {
|
|
my $self = shift;
|
|
my ($target, $source) = @_;
|
|
|
|
# Evaluate softlink relative to its target
|
|
my $path = join_paths(parent($target), $source);
|
|
debug(4, 2, "is path $path owned by stow?");
|
|
|
|
# Search for .stow files - this allows us to detect links
|
|
# owned by stow directories other than the current one.
|
|
my $dir = '';
|
|
my @path = split m{/+}, $path;
|
|
for my $i (0 .. $#path) {
|
|
my $part = $path[$i];
|
|
$dir = join_paths($dir, $part);
|
|
if ($self->marked_stow_dir($dir)) {
|
|
# FIXME - not sure if this can ever happen
|
|
internal_error("find_stowed_path() called directly on stow dir")
|
|
if $i == $#path;
|
|
|
|
debug(4, 3, "yes - $dir was marked as a stow dir");
|
|
my $package = $path[$i + 1];
|
|
return ($path, $dir, $package);
|
|
}
|
|
}
|
|
|
|
# If no .stow file was found, we need to find out whether it's
|
|
# owned by the current stow directory, in which case $path will be
|
|
# a prefix of $self->{stow_path}.
|
|
if (substr($path, 0, 1) eq '/' xor substr($self->{stow_path}, 0, 1) eq '/')
|
|
{
|
|
warn "BUG in find_stowed_path? Absolute/relative mismatch between " .
|
|
"Stow dir $self->{stow_path} and path $path";
|
|
}
|
|
|
|
my @stow_path = split m{/+}, $self->{stow_path};
|
|
|
|
# Strip off common prefixes until one is empty
|
|
while (@path && @stow_path) {
|
|
if ((shift @path) ne (shift @stow_path)) {
|
|
debug(4, 3, "no - either $path not under $self->{stow_path} or vice-versa");
|
|
return ('', '', '');
|
|
}
|
|
}
|
|
|
|
if (@stow_path) { # @path must be empty
|
|
debug(4, 3, "no - $path is not under $self->{stow_path}");
|
|
return ('', '', '');
|
|
}
|
|
|
|
my $package = shift @path;
|
|
|
|
debug(4, 3, "yes - by $package in " . join_paths(@path));
|
|
return ($path, $self->{stow_path}, $package);
|
|
}
|
|
|
|
#===== METHOD ================================================================
|
|
# Name : cleanup_invalid_links()
|
|
# Purpose : clean up invalid links that may block folding
|
|
# Parameters: $dir => path to directory to check
|
|
# Returns : n/a
|
|
# Throws : no exceptions
|
|
# Comments : removing files from a stowed package is probably a bad practice
|
|
# : so this kind of clean up is not _really_ stow's responsibility;
|
|
# : however, failing to clean up can block tree folding, so we'll do
|
|
# : it anyway
|
|
#=============================================================================
|
|
sub cleanup_invalid_links {
|
|
my $self = shift;
|
|
my ($dir) = @_;
|
|
|
|
my $cwd = getcwd();
|
|
debug(2, 0, "Cleaning up any invalid links in $dir (pwd=$cwd)");
|
|
|
|
if (not -d $dir) {
|
|
internal_error("cleanup_invalid_links() called with a non-directory: $dir");
|
|
}
|
|
|
|
opendir my $DIR, $dir
|
|
or error("cannot read directory: $dir ($!)");
|
|
my @listing = readdir $DIR;
|
|
closedir $DIR;
|
|
|
|
NODE:
|
|
for my $node (@listing) {
|
|
next NODE if $node eq '.';
|
|
next NODE if $node eq '..';
|
|
|
|
my $node_path = join_paths($dir, $node);
|
|
|
|
next unless -l $node_path;
|
|
|
|
debug(4, 1, "Checking validity of link $node_path");
|
|
|
|
if (exists $self->{link_task_for}{$node_path}) {
|
|
my $action = $self->{link_task_for}{$node_path}{action};
|
|
if ($action ne 'remove') {
|
|
warn "Unexpected action $action scheduled for $node_path; skipping clean-up\n";
|
|
}
|
|
else {
|
|
debug(4, 2, "$node_path scheduled for removal; skipping clean-up");
|
|
}
|
|
next;
|
|
}
|
|
|
|
# Where is the link pointing?
|
|
# (don't use read_a_link() here)
|
|
my $source = readlink($node_path);
|
|
if (not $source) {
|
|
error("Could not read link $node_path");
|
|
}
|
|
|
|
if (-e join_paths($dir, $source)) {
|
|
debug(4, 2, "Link target $source exists; skipping clean up");
|
|
next;
|
|
}
|
|
|
|
debug(3, 1,
|
|
"Checking whether valid link $node_path -> $source is " .
|
|
"owned by stow");
|
|
|
|
if ($self->link_owned_by_package($node_path, $source)) {
|
|
# owned by stow
|
|
debug(2, 0, "--- removing stale link: $node_path => " .
|
|
join_paths($dir, $source));
|
|
$self->do_unlink($node_path);
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : foldable()
|
|
# Purpose : determine whether a tree can be folded
|
|
# Parameters: $target => path to a directory
|
|
# Returns : path to the parent dir iff the tree can be safely folded
|
|
# Throws : n/a
|
|
# Comments : the path returned is relative to the parent of $target,
|
|
# : that is, it can be used as the source for a replacement symlink
|
|
#============================================================================
|
|
sub foldable {
|
|
my $self = shift;
|
|
my ($target) = @_;
|
|
|
|
debug(3, 2, "Is $target foldable?");
|
|
if ($self->{'no-folding'}) {
|
|
debug(3, 3, "no because --no-folding enabled");
|
|
return '';
|
|
}
|
|
|
|
opendir my $DIR, $target
|
|
or error(qq{Cannot read directory "$target" ($!)\n});
|
|
my @listing = readdir $DIR;
|
|
closedir $DIR;
|
|
|
|
my $parent = '';
|
|
NODE:
|
|
for my $node (@listing) {
|
|
|
|
next NODE if $node eq '.';
|
|
next NODE if $node eq '..';
|
|
|
|
my $path = join_paths($target, $node);
|
|
|
|
# Skip nodes scheduled for removal
|
|
next NODE if not $self->is_a_node($path);
|
|
|
|
# If it's not a link then we can't fold its parent
|
|
return '' if not $self->is_a_link($path);
|
|
|
|
# Where is the link pointing?
|
|
my $source = $self->read_a_link($path);
|
|
if (not $source) {
|
|
error("Could not read link $path");
|
|
}
|
|
if ($parent eq '') {
|
|
$parent = parent($source)
|
|
}
|
|
elsif ($parent ne parent($source)) {
|
|
return '';
|
|
}
|
|
}
|
|
return '' if not $parent;
|
|
|
|
# If we get here then all nodes inside $target are links, and those links
|
|
# point to nodes inside the same directory.
|
|
|
|
# chop of leading '..' to get the path to the common parent directory
|
|
# relative to the parent of our $target
|
|
$parent =~ s{\A\.\./}{};
|
|
|
|
# If the resulting path is owned by stow, we can fold it
|
|
if ($self->link_owned_by_package($target, $parent)) {
|
|
debug(3, 3, "$target is foldable");
|
|
return $parent;
|
|
}
|
|
else {
|
|
return '';
|
|
}
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : fold_tree()
|
|
# Purpose : fold the given tree
|
|
# Parameters: $source => link to the folded tree source
|
|
# : $target => directory that we will replace with a link to $source
|
|
# Returns : n/a
|
|
# Throws : none
|
|
# Comments : only called iff foldable() is true so we can remove some checks
|
|
#============================================================================
|
|
sub fold_tree {
|
|
my $self = shift;
|
|
my ($target, $source) = @_;
|
|
|
|
debug(3, 0, "--- Folding tree: $target => $source");
|
|
|
|
opendir my $DIR, $target
|
|
or error(qq{Cannot read directory "$target" ($!)\n});
|
|
my @listing = readdir $DIR;
|
|
closedir $DIR;
|
|
|
|
NODE:
|
|
for my $node (@listing) {
|
|
next NODE if $node eq '.';
|
|
next NODE if $node eq '..';
|
|
next NODE if not $self->is_a_node(join_paths($target, $node));
|
|
$self->do_unlink(join_paths($target, $node));
|
|
}
|
|
$self->do_rmdir($target);
|
|
$self->do_link($source, $target);
|
|
return;
|
|
}
|
|
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : conflict()
|
|
# Purpose : handle conflicts in stow operations
|
|
# Parameters: $package => the package involved with the conflicting operation
|
|
# : $message => a description of the conflict
|
|
# Returns : n/a
|
|
# Throws : none
|
|
# Comments : none
|
|
#============================================================================
|
|
sub conflict {
|
|
my $self = shift;
|
|
my ($action, $package, $message) = @_;
|
|
|
|
debug(2, 0, "CONFLICT when ${action}ing $package: $message");
|
|
$self->{conflicts}{$action}{$package} ||= [];
|
|
push @{ $self->{conflicts}{$action}{$package} }, $message;
|
|
$self->{conflict_count}++;
|
|
|
|
return;
|
|
}
|
|
|
|
=head2 get_conflicts()
|
|
|
|
Returns a nested hash of all potential conflicts discovered: the keys
|
|
are actions ('stow' or 'unstow'), and the values are hashrefs whose
|
|
keys are stow package names and whose values are conflict
|
|
descriptions, e.g.:
|
|
|
|
(
|
|
stow => {
|
|
perl => [
|
|
"existing target is not owned by stow: bin/a2p"
|
|
"existing target is neither a link nor a directory: bin/perl"
|
|
]
|
|
}
|
|
)
|
|
|
|
=cut
|
|
|
|
sub get_conflicts {
|
|
my $self = shift;
|
|
return %{ $self->{conflicts} };
|
|
}
|
|
|
|
=head2 get_conflict_count()
|
|
|
|
Returns the number of conflicts found.
|
|
|
|
=cut
|
|
|
|
sub get_conflict_count {
|
|
my $self = shift;
|
|
return $self->{conflict_count};
|
|
}
|
|
|
|
=head2 get_tasks()
|
|
|
|
Returns a list of all symlink/directory creation/removal tasks.
|
|
|
|
=cut
|
|
|
|
sub get_tasks {
|
|
my $self = shift;
|
|
return @{ $self->{tasks} };
|
|
}
|
|
|
|
=head2 get_action_count()
|
|
|
|
Returns the number of actions planned for this Stow instance.
|
|
|
|
=cut
|
|
|
|
sub get_action_count {
|
|
my $self = shift;
|
|
return $self->{action_count};
|
|
}
|
|
|
|
#===== METHOD ================================================================
|
|
# Name : ignore
|
|
# Purpose : determine if the given path matches a regex in our ignore list
|
|
# Parameters: $stow_path => the stow directory containing the package
|
|
# : $package => the package containing the path
|
|
# : $target => the path to check against the ignore list
|
|
# : relative to its package directory
|
|
# Returns : true iff the path should be ignored
|
|
# Throws : no exceptions
|
|
# Comments : none
|
|
#=============================================================================
|
|
sub ignore {
|
|
my $self = shift;
|
|
my ($stow_path, $package, $target) = @_;
|
|
|
|
internal_error(__PACKAGE__ . "::ignore() called with empty target")
|
|
unless length $target;
|
|
|
|
for my $suffix (@{ $self->{ignore} }) {
|
|
if ($target =~ m/$suffix/) {
|
|
debug(4, 1, "Ignoring path $target due to --ignore=$suffix");
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
my $package_dir = join_paths($stow_path, $package);
|
|
my ($path_regexp, $segment_regexp) =
|
|
$self->get_ignore_regexps($package_dir);
|
|
debug(5, 2, "Ignore list regexp for paths: " .
|
|
(defined $path_regexp ? "/$path_regexp/" : "none"));
|
|
debug(5, 2, "Ignore list regexp for segments: " .
|
|
(defined $segment_regexp ? "/$segment_regexp/" : "none"));
|
|
|
|
if (defined $path_regexp and "/$target" =~ $path_regexp) {
|
|
debug(4, 1, "Ignoring path /$target");
|
|
return 1;
|
|
}
|
|
|
|
(my $basename = $target) =~ s!.+/!!;
|
|
if (defined $segment_regexp and $basename =~ $segment_regexp) {
|
|
debug(4, 1, "Ignoring path segment $basename");
|
|
return 1;
|
|
}
|
|
|
|
debug(5, 1, "Not ignoring $target");
|
|
return 0;
|
|
}
|
|
|
|
sub get_ignore_regexps {
|
|
my $self = shift;
|
|
my ($dir) = @_;
|
|
|
|
# N.B. the local and global stow ignore files have to have different
|
|
# names so that:
|
|
# 1. the global one can be a symlink to within a stow
|
|
# package, managed by stow itself, and
|
|
# 2. the local ones can be ignored via hardcoded logic in
|
|
# GlobsToRegexp(), so that they always stay within their stow packages.
|
|
|
|
my $local_stow_ignore = join_paths($dir, $LOCAL_IGNORE_FILE);
|
|
my $global_stow_ignore = join_paths($ENV{HOME}, $GLOBAL_IGNORE_FILE);
|
|
|
|
for my $file ($local_stow_ignore, $global_stow_ignore) {
|
|
if (-e $file) {
|
|
debug(5, 1, "Using ignore file: $file");
|
|
return $self->get_ignore_regexps_from_file($file);
|
|
}
|
|
else {
|
|
debug(5, 1, "$file didn't exist");
|
|
}
|
|
}
|
|
|
|
debug(4, 1, "Using built-in ignore list");
|
|
return @default_global_ignore_regexps;
|
|
}
|
|
|
|
my %ignore_file_regexps;
|
|
|
|
sub get_ignore_regexps_from_file {
|
|
my $self = shift;
|
|
my ($file) = @_;
|
|
|
|
if (exists $ignore_file_regexps{$file}) {
|
|
debug(4, 2, "Using memoized regexps from $file");
|
|
return @{ $ignore_file_regexps{$file} };
|
|
}
|
|
|
|
if (! open(REGEXPS, $file)) {
|
|
debug(4, 2, "Failed to open $file: $!");
|
|
return undef;
|
|
}
|
|
|
|
my @regexps = $self->get_ignore_regexps_from_fh(\*REGEXPS);
|
|
close(REGEXPS);
|
|
|
|
$ignore_file_regexps{$file} = [ @regexps ];
|
|
return @regexps;
|
|
}
|
|
|
|
=head2 invalidate_memoized_regexp($file)
|
|
|
|
For efficiency of performance, regular expressions are compiled from
|
|
each ignore list file the first time it is used by the Stow process,
|
|
and then memoized for future use. If you expect the contents of these
|
|
files to change during a single run, you will need to invalidate the
|
|
memoized value from this cache. This method allows you to do that.
|
|
|
|
=cut
|
|
|
|
sub invalidate_memoized_regexp {
|
|
my $self = shift;
|
|
my ($file) = @_;
|
|
if (exists $ignore_file_regexps{$file}) {
|
|
debug(4, 2, "Invalidated memoized regexp for $file");
|
|
delete $ignore_file_regexps{$file};
|
|
}
|
|
else {
|
|
debug(2, 1, "WARNING: no memoized regexp for $file to invalidate");
|
|
}
|
|
}
|
|
|
|
sub get_ignore_regexps_from_fh {
|
|
my $self = shift;
|
|
my ($fh) = @_;
|
|
my %regexps;
|
|
while (<$fh>) {
|
|
chomp;
|
|
s/^\s+//;
|
|
s/\s+$//;
|
|
next if /^#/ or length($_) == 0;
|
|
s/\s+#.+//; # strip comments to right of pattern
|
|
s/\\#/#/g;
|
|
$regexps{$_}++;
|
|
}
|
|
|
|
# Local ignore lists should *always* stay within the stow directory,
|
|
# because this is the only place stow looks for them.
|
|
$regexps{"^/\Q$LOCAL_IGNORE_FILE\E\$"}++;
|
|
|
|
return $self->compile_ignore_regexps(%regexps);
|
|
}
|
|
|
|
sub compile_ignore_regexps {
|
|
my $self = shift;
|
|
my (%regexps) = @_;
|
|
|
|
my @segment_regexps;
|
|
my @path_regexps;
|
|
for my $regexp (keys %regexps) {
|
|
if (index($regexp, '/') < 0) {
|
|
# No / found in regexp, so use it for matching against basename
|
|
push @segment_regexps, $regexp;
|
|
}
|
|
else {
|
|
# / found in regexp, so use it for matching against full path
|
|
push @path_regexps, $regexp;
|
|
}
|
|
}
|
|
|
|
my $segment_regexp = join '|', @segment_regexps;
|
|
my $path_regexp = join '|', @path_regexps;
|
|
$segment_regexp = @segment_regexps ?
|
|
$self->compile_regexp("^($segment_regexp)\$") : undef;
|
|
$path_regexp = @path_regexps ?
|
|
$self->compile_regexp("(^|/)($path_regexp)(/|\$)") : undef;
|
|
|
|
return ($path_regexp, $segment_regexp);
|
|
}
|
|
|
|
sub compile_regexp {
|
|
my $self = shift;
|
|
my ($regexp) = @_;
|
|
my $compiled = eval { qr/$regexp/ };
|
|
die "Failed to compile regexp: $@\n" if $@;
|
|
return $compiled;
|
|
}
|
|
|
|
sub get_default_global_ignore_regexps {
|
|
my $class = shift;
|
|
# Bootstrap issue - first time we stow, we will be stowing
|
|
# .cvsignore so it might not exist in ~ yet, or if it does, it could
|
|
# be an old version missing the entries we need. So we make sure
|
|
# they are there by hardcoding some crucial entries.
|
|
return $class->get_ignore_regexps_from_fh(\*DATA);
|
|
}
|
|
|
|
#===== METHOD ================================================================
|
|
# Name : defer
|
|
# Purpose : determine if the given path matches a regex in our defer list
|
|
# Parameters: $path
|
|
# Returns : Boolean
|
|
# Throws : no exceptions
|
|
# Comments : none
|
|
#=============================================================================
|
|
sub defer {
|
|
my $self = shift;
|
|
my ($path) = @_;
|
|
|
|
for my $prefix (@{ $self->{defer} }) {
|
|
return 1 if $path =~ m/$prefix/;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#===== METHOD ================================================================
|
|
# Name : override
|
|
# Purpose : determine if the given path matches a regex in our override list
|
|
# Parameters: $path
|
|
# Returns : Boolean
|
|
# Throws : no exceptions
|
|
# Comments : none
|
|
#=============================================================================
|
|
sub override {
|
|
my $self = shift;
|
|
my ($path) = @_;
|
|
|
|
for my $regex (@{ $self->{override} }) {
|
|
return 1 if $path =~ m/$regex/;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
##############################################################################
|
|
#
|
|
# The following code provides the abstractions that allow us to defer operating
|
|
# on the filesystem until after all potential conflcits have been assessed.
|
|
#
|
|
##############################################################################
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : process_tasks()
|
|
# Purpose : process each task in the tasks list
|
|
# Parameters: none
|
|
# Returns : n/a
|
|
# Throws : fatal error if tasks list is corrupted or a task fails
|
|
# Comments : none
|
|
#============================================================================
|
|
sub process_tasks {
|
|
my $self = shift;
|
|
|
|
debug(2, 0, "Processing tasks...");
|
|
|
|
# Strip out all tasks with a skip action
|
|
$self->{tasks} = [ grep { $_->{action} ne 'skip' } @{ $self->{tasks} } ];
|
|
|
|
if (not @{ $self->{tasks} }) {
|
|
return;
|
|
}
|
|
|
|
$self->within_target_do(sub {
|
|
for my $task (@{ $self->{tasks} }) {
|
|
$self->process_task($task);
|
|
}
|
|
});
|
|
|
|
debug(2, 0, "Processing tasks... done");
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : process_task()
|
|
# Purpose : process a single task
|
|
# Parameters: $task => the task to process
|
|
# Returns : n/a
|
|
# Throws : fatal error if task fails
|
|
# Comments : Must run from within target directory.
|
|
# : Task involve either creating or deleting dirs and symlinks
|
|
# : an action is set to 'skip' if it is found to be redundant
|
|
#============================================================================
|
|
sub process_task {
|
|
my $self = shift;
|
|
my ($task) = @_;
|
|
|
|
if ($task->{action} eq 'create') {
|
|
if ($task->{type} eq 'dir') {
|
|
mkdir($task->{path}, 0777)
|
|
or error("Could not create directory: $task->{path} ($!)");
|
|
return;
|
|
}
|
|
elsif ($task->{type} eq 'link') {
|
|
symlink $task->{source}, $task->{path}
|
|
or error(
|
|
"Could not create symlink: %s => %s ($!)",
|
|
$task->{path},
|
|
$task->{source}
|
|
);
|
|
return;
|
|
}
|
|
}
|
|
elsif ($task->{action} eq 'remove') {
|
|
if ($task->{type} eq 'dir') {
|
|
rmdir $task->{path}
|
|
or error("Could not remove directory: $task->{path} ($!)");
|
|
return;
|
|
}
|
|
elsif ($task->{type} eq 'link') {
|
|
unlink $task->{path}
|
|
or error("Could not remove link: $task->{path} ($!)");
|
|
return;
|
|
}
|
|
}
|
|
elsif ($task->{action} eq 'move') {
|
|
if ($task->{type} eq 'file') {
|
|
# rename() not good enough, since the stow directory
|
|
# might be on a different filesystem to the target.
|
|
move $task->{path}, $task->{dest}
|
|
or error("Could not move $task->{path} -> $task->{dest} ($!)");
|
|
return;
|
|
}
|
|
}
|
|
|
|
# Should never happen.
|
|
internal_error("bad task action: $task->{action}");
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : link_task_action()
|
|
# Purpose : finds the link task action for the given path, if there is one
|
|
# Parameters: $path
|
|
# Returns : 'remove', 'create', or '' if there is no action
|
|
# Throws : a fatal exception if an invalid action is found
|
|
# Comments : none
|
|
#============================================================================
|
|
sub link_task_action {
|
|
my $self = shift;
|
|
my ($path) = @_;
|
|
|
|
if (! exists $self->{link_task_for}{$path}) {
|
|
debug(4, 1, "link_task_action($path): no task");
|
|
return '';
|
|
}
|
|
|
|
my $action = $self->{link_task_for}{$path}->{action};
|
|
internal_error("bad task action: $action")
|
|
unless $action eq 'remove' or $action eq 'create';
|
|
|
|
debug(4, 1, "link_task_action($path): link task exists with action $action");
|
|
return $action;
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : dir_task_action()
|
|
# Purpose : finds the dir task action for the given path, if there is one
|
|
# Parameters: $path
|
|
# Returns : 'remove', 'create', or '' if there is no action
|
|
# Throws : a fatal exception if an invalid action is found
|
|
# Comments : none
|
|
#============================================================================
|
|
sub dir_task_action {
|
|
my $self = shift;
|
|
my ($path) = @_;
|
|
|
|
if (! exists $self->{dir_task_for}{$path}) {
|
|
debug(4, 1, "dir_task_action($path): no task");
|
|
return '';
|
|
}
|
|
|
|
my $action = $self->{dir_task_for}{$path}->{action};
|
|
internal_error("bad task action: $action")
|
|
unless $action eq 'remove' or $action eq 'create';
|
|
|
|
debug(4, 1, "dir_task_action($path): dir task exists with action $action");
|
|
return $action;
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : parent_link_scheduled_for_removal()
|
|
# Purpose : determine whether the given path or any parent thereof
|
|
# : is a link scheduled for removal
|
|
# Parameters: $path
|
|
# Returns : Boolean
|
|
# Throws : none
|
|
# Comments : none
|
|
#============================================================================
|
|
sub parent_link_scheduled_for_removal {
|
|
my $self = shift;
|
|
my ($path) = @_;
|
|
|
|
my $prefix = '';
|
|
for my $part (split m{/+}, $path) {
|
|
$prefix = join_paths($prefix, $part);
|
|
debug(4, 2, "parent_link_scheduled_for_removal($path): prefix $prefix");
|
|
if (exists $self->{link_task_for}{$prefix} and
|
|
$self->{link_task_for}{$prefix}->{action} eq 'remove') {
|
|
debug(4, 2, "parent_link_scheduled_for_removal($path): link scheduled for removal");
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
debug(4, 2, "parent_link_scheduled_for_removal($path): returning false");
|
|
return 0;
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : is_a_link()
|
|
# Purpose : determine if the given path is a current or planned link
|
|
# Parameters: $path
|
|
# Returns : Boolean
|
|
# Throws : none
|
|
# Comments : returns false if an existing link is scheduled for removal
|
|
# : and true if a non-existent link is scheduled for creation
|
|
#============================================================================
|
|
sub is_a_link {
|
|
my $self = shift;
|
|
my ($path) = @_;
|
|
debug(4, 1, "is_a_link($path)");
|
|
|
|
if (my $action = $self->link_task_action($path)) {
|
|
if ($action eq 'remove') {
|
|
debug(4, 1, "is_a_link($path): returning 0 (remove action found)");
|
|
return 0;
|
|
}
|
|
elsif ($action eq 'create') {
|
|
debug(4, 1, "is_a_link($path): returning 1 (create action found)");
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (-l $path) {
|
|
# Check if any of its parent are links scheduled for removal
|
|
# (need this for edge case during unfolding)
|
|
debug(4, 1, "is_a_link($path): is a real link");
|
|
return $self->parent_link_scheduled_for_removal($path) ? 0 : 1;
|
|
}
|
|
|
|
debug(4, 1, "is_a_link($path): returning 0");
|
|
return 0;
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : is_a_dir()
|
|
# Purpose : determine if the given path is a current or planned directory
|
|
# Parameters: $path
|
|
# Returns : Boolean
|
|
# Throws : none
|
|
# Comments : returns false if an existing directory is scheduled for removal
|
|
# : and true if a non-existent directory is scheduled for creation
|
|
# : we also need to be sure we are not just following a link
|
|
#============================================================================
|
|
sub is_a_dir {
|
|
my $self = shift;
|
|
my ($path) = @_;
|
|
debug(4, 1, "is_a_dir($path)");
|
|
|
|
if (my $action = $self->dir_task_action($path)) {
|
|
if ($action eq 'remove') {
|
|
return 0;
|
|
}
|
|
elsif ($action eq 'create') {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0 if $self->parent_link_scheduled_for_removal($path);
|
|
|
|
if (-d $path) {
|
|
debug(4, 1, "is_a_dir($path): real dir");
|
|
return 1;
|
|
}
|
|
|
|
debug(4, 1, "is_a_dir($path): returning false");
|
|
return 0;
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : is_a_node()
|
|
# Purpose : determine whether the given path is a current or planned node
|
|
# Parameters: $path
|
|
# Returns : Boolean
|
|
# Throws : none
|
|
# Comments : returns false if an existing node is scheduled for removal
|
|
# : true if a non-existent node is scheduled for creation
|
|
# : we also need to be sure we are not just following a link
|
|
#============================================================================
|
|
sub is_a_node {
|
|
my $self = shift;
|
|
my ($path) = @_;
|
|
debug(4, 1, "Checking whether $path is a current/planned node");
|
|
|
|
my $laction = $self->link_task_action($path);
|
|
my $daction = $self->dir_task_action($path);
|
|
|
|
if ($laction eq 'remove') {
|
|
if ($daction eq 'remove') {
|
|
internal_error("removing link and dir: $path");
|
|
return 0;
|
|
}
|
|
elsif ($daction eq 'create') {
|
|
# Assume that we're unfolding $path, and that the link
|
|
# removal action is earlier than the dir creation action
|
|
# in the task queue. FIXME: is this a safe assumption?
|
|
return 1;
|
|
}
|
|
else { # no dir action
|
|
return 0;
|
|
}
|
|
}
|
|
elsif ($laction eq 'create') {
|
|
if ($daction eq 'remove') {
|
|
# Assume that we're folding $path, and that the dir
|
|
# removal action is earlier than the link creation action
|
|
# in the task queue. FIXME: is this a safe assumption?
|
|
return 1;
|
|
}
|
|
elsif ($daction eq 'create') {
|
|
internal_error("creating link and dir: $path");
|
|
return 1;
|
|
}
|
|
else { # no dir action
|
|
return 1;
|
|
}
|
|
}
|
|
else {
|
|
# No link action
|
|
if ($daction eq 'remove') {
|
|
return 0;
|
|
}
|
|
elsif ($daction eq 'create') {
|
|
return 1;
|
|
}
|
|
else { # no dir action
|
|
# fall through to below
|
|
}
|
|
}
|
|
|
|
return 0 if $self->parent_link_scheduled_for_removal($path);
|
|
|
|
if (-e $path) {
|
|
debug(4, 1, "is_a_node($path): really exists");
|
|
return 1;
|
|
}
|
|
|
|
debug(4, 1, "is_a_node($path): returning false");
|
|
return 0;
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : read_a_link()
|
|
# Purpose : return the source of a current or planned link
|
|
# Parameters: $path => path to the link target
|
|
# Returns : a string
|
|
# Throws : fatal exception if the given path is not a current or planned
|
|
# : link
|
|
# Comments : none
|
|
#============================================================================
|
|
sub read_a_link {
|
|
my $self = shift;
|
|
my ($path) = @_;
|
|
|
|
if (my $action = $self->link_task_action($path)) {
|
|
debug(4, 1, "read_a_link($path): task exists with action $action");
|
|
|
|
if ($action eq 'create') {
|
|
return $self->{link_task_for}{$path}->{source};
|
|
}
|
|
elsif ($action eq 'remove') {
|
|
internal_error(
|
|
"read_a_link() passed a path that is scheduled for removal: $path"
|
|
);
|
|
}
|
|
}
|
|
elsif (-l $path) {
|
|
debug(4, 1, "read_a_link($path): real link");
|
|
my $target = readlink $path or error("Could not read link: $path ($!)");
|
|
return $target;
|
|
}
|
|
internal_error("read_a_link() passed a non link path: $path\n");
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : do_link()
|
|
# Purpose : wrap 'link' operation for later processing
|
|
# Parameters: $oldfile => the existing file to link to
|
|
# : $newfile => the file to link
|
|
# Returns : n/a
|
|
# Throws : error if this clashes with an existing planned operation
|
|
# Comments : cleans up operations that undo previous operations
|
|
#============================================================================
|
|
sub do_link {
|
|
my $self = shift;
|
|
my ($oldfile, $newfile) = @_;
|
|
|
|
if (exists $self->{dir_task_for}{$newfile}) {
|
|
my $task_ref = $self->{dir_task_for}{$newfile};
|
|
|
|
if ($task_ref->{action} eq 'create') {
|
|
if ($task_ref->{type} eq 'dir') {
|
|
internal_error(
|
|
"new link (%s => %s) clashes with planned new directory",
|
|
$newfile,
|
|
$oldfile,
|
|
);
|
|
}
|
|
}
|
|
elsif ($task_ref->{action} eq 'remove') {
|
|
# We may need to remove a directory before creating a link so continue.
|
|
}
|
|
else {
|
|
internal_error("bad task action: $task_ref->{action}");
|
|
}
|
|
}
|
|
|
|
if (exists $self->{link_task_for}{$newfile}) {
|
|
my $task_ref = $self->{link_task_for}{$newfile};
|
|
|
|
if ($task_ref->{action} eq 'create') {
|
|
if ($task_ref->{source} ne $oldfile) {
|
|
internal_error(
|
|
"new link clashes with planned new link: %s => %s",
|
|
$task_ref->{path},
|
|
$task_ref->{source},
|
|
)
|
|
}
|
|
else {
|
|
debug(1, 0, "LINK: $newfile => $oldfile (duplicates previous action)");
|
|
return;
|
|
}
|
|
}
|
|
elsif ($task_ref->{action} eq 'remove') {
|
|
if ($task_ref->{source} eq $oldfile) {
|
|
# No need to remove a link we are going to recreate
|
|
debug(1, 0, "LINK: $newfile => $oldfile (reverts previous action)");
|
|
$self->{link_task_for}{$newfile}->{action} = 'skip';
|
|
delete $self->{link_task_for}{$newfile};
|
|
return;
|
|
}
|
|
# We may need to remove a link to replace it so continue
|
|
}
|
|
else {
|
|
internal_error("bad task action: $task_ref->{action}");
|
|
}
|
|
}
|
|
|
|
# Creating a new link
|
|
debug(1, 0, "LINK: $newfile => $oldfile");
|
|
my $task = {
|
|
action => 'create',
|
|
type => 'link',
|
|
path => $newfile,
|
|
source => $oldfile,
|
|
};
|
|
push @{ $self->{tasks} }, $task;
|
|
$self->{link_task_for}{$newfile} = $task;
|
|
|
|
return;
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : do_unlink()
|
|
# Purpose : wrap 'unlink' operation for later processing
|
|
# Parameters: $file => the file to unlink
|
|
# Returns : n/a
|
|
# Throws : error if this clashes with an existing planned operation
|
|
# Comments : will remove an existing planned link
|
|
#============================================================================
|
|
sub do_unlink {
|
|
my $self = shift;
|
|
my ($file) = @_;
|
|
|
|
if (exists $self->{link_task_for}{$file}) {
|
|
my $task_ref = $self->{link_task_for}{$file};
|
|
if ($task_ref->{action} eq 'remove') {
|
|
debug(1, 0, "UNLINK: $file (duplicates previous action)");
|
|
return;
|
|
}
|
|
elsif ($task_ref->{action} eq 'create') {
|
|
# Do need to create a link then remove it
|
|
debug(1, 0, "UNLINK: $file (reverts previous action)");
|
|
$self->{link_task_for}{$file}->{action} = 'skip';
|
|
delete $self->{link_task_for}{$file};
|
|
return;
|
|
}
|
|
else {
|
|
internal_error("bad task action: $task_ref->{action}");
|
|
}
|
|
}
|
|
|
|
if (exists $self->{dir_task_for}{$file} and $self->{dir_task_for}{$file} eq 'create') {
|
|
internal_error(
|
|
"new unlink operation clashes with planned operation: %s dir %s",
|
|
$self->{dir_task_for}{$file}->{action},
|
|
$file
|
|
);
|
|
}
|
|
|
|
# Remove the link
|
|
debug(1, 0, "UNLINK: $file");
|
|
|
|
my $source = readlink $file or error("could not readlink $file ($!)");
|
|
|
|
my $task = {
|
|
action => 'remove',
|
|
type => 'link',
|
|
path => $file,
|
|
source => $source,
|
|
};
|
|
push @{ $self->{tasks} }, $task;
|
|
$self->{link_task_for}{$file} = $task;
|
|
|
|
return;
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : do_mkdir()
|
|
# Purpose : wrap 'mkdir' operation
|
|
# Parameters: $dir => the directory to remove
|
|
# Returns : n/a
|
|
# Throws : fatal exception if operation fails
|
|
# Comments : outputs a message if 'verbose' option is set
|
|
# : does not perform operation if 'simulate' option is set
|
|
# Comments : cleans up operations that undo previous operations
|
|
#============================================================================
|
|
sub do_mkdir {
|
|
my $self = shift;
|
|
my ($dir) = @_;
|
|
|
|
if (exists $self->{link_task_for}{$dir}) {
|
|
my $task_ref = $self->{link_task_for}{$dir};
|
|
|
|
if ($task_ref->{action} eq 'create') {
|
|
internal_error(
|
|
"new dir clashes with planned new link (%s => %s)",
|
|
$task_ref->{path},
|
|
$task_ref->{source},
|
|
);
|
|
}
|
|
elsif ($task_ref->{action} eq 'remove') {
|
|
# May need to remove a link before creating a directory so continue
|
|
}
|
|
else {
|
|
internal_error("bad task action: $task_ref->{action}");
|
|
}
|
|
}
|
|
|
|
if (exists $self->{dir_task_for}{$dir}) {
|
|
my $task_ref = $self->{dir_task_for}{$dir};
|
|
|
|
if ($task_ref->{action} eq 'create') {
|
|
debug(1, 0, "MKDIR: $dir (duplicates previous action)");
|
|
return;
|
|
}
|
|
elsif ($task_ref->{action} eq 'remove') {
|
|
debug(1, 0, "MKDIR: $dir (reverts previous action)");
|
|
$self->{dir_task_for}{$dir}->{action} = 'skip';
|
|
delete $self->{dir_task_for}{$dir};
|
|
return;
|
|
}
|
|
else {
|
|
internal_error("bad task action: $task_ref->{action}");
|
|
}
|
|
}
|
|
|
|
debug(1, 0, "MKDIR: $dir");
|
|
my $task = {
|
|
action => 'create',
|
|
type => 'dir',
|
|
path => $dir,
|
|
source => undef,
|
|
};
|
|
push @{ $self->{tasks} }, $task;
|
|
$self->{dir_task_for}{$dir} = $task;
|
|
|
|
return;
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : do_rmdir()
|
|
# Purpose : wrap 'rmdir' operation
|
|
# Parameters: $dir => the directory to remove
|
|
# Returns : n/a
|
|
# Throws : fatal exception if operation fails
|
|
# Comments : outputs a message if 'verbose' option is set
|
|
# : does not perform operation if 'simulate' option is set
|
|
#============================================================================
|
|
sub do_rmdir {
|
|
my $self = shift;
|
|
my ($dir) = @_;
|
|
|
|
if (exists $self->{link_task_for}{$dir}) {
|
|
my $task_ref = $self->{link_task_for}{$dir};
|
|
internal_error(
|
|
"rmdir clashes with planned operation: %s link %s => %s",
|
|
$task_ref->{action},
|
|
$task_ref->{path},
|
|
$task_ref->{source}
|
|
);
|
|
}
|
|
|
|
if (exists $self->{dir_task_for}{$dir}) {
|
|
my $task_ref = $self->{link_task_for}{$dir};
|
|
|
|
if ($task_ref->{action} eq 'remove') {
|
|
debug(1, 0, "RMDIR $dir (duplicates previous action)");
|
|
return;
|
|
}
|
|
elsif ($task_ref->{action} eq 'create') {
|
|
debug(1, 0, "MKDIR $dir (reverts previous action)");
|
|
$self->{link_task_for}{$dir}->{action} = 'skip';
|
|
delete $self->{link_task_for}{$dir};
|
|
return;
|
|
}
|
|
else {
|
|
internal_error("bad task action: $task_ref->{action}");
|
|
}
|
|
}
|
|
|
|
debug(1, 0, "RMDIR $dir");
|
|
my $task = {
|
|
action => 'remove',
|
|
type => 'dir',
|
|
path => $dir,
|
|
source => '',
|
|
};
|
|
push @{ $self->{tasks} }, $task;
|
|
$self->{dir_task_for}{$dir} = $task;
|
|
|
|
return;
|
|
}
|
|
|
|
#===== METHOD ===============================================================
|
|
# Name : do_mv()
|
|
# Purpose : wrap 'move' operation for later processing
|
|
# Parameters: $src => the file to move
|
|
# : $dst => the path to move it to
|
|
# Returns : n/a
|
|
# Throws : error if this clashes with an existing planned operation
|
|
# Comments : alters contents of package installation image in stow dir
|
|
#============================================================================
|
|
sub do_mv {
|
|
my $self = shift;
|
|
my ($src, $dst) = @_;
|
|
|
|
if (exists $self->{link_task_for}{$src}) {
|
|
# I don't *think* this should ever happen, but I'm not
|
|
# 100% sure.
|
|
my $task_ref = $self->{link_task_for}{$src};
|
|
internal_error(
|
|
"do_mv: pre-existing link task for $src; action: %s, source: %s",
|
|
$task_ref->{action}, $task_ref->{source}
|
|
);
|
|
}
|
|
elsif (exists $self->{dir_task_for}{$src}) {
|
|
my $task_ref = $self->{dir_task_for}{$src};
|
|
internal_error(
|
|
"do_mv: pre-existing dir task for %s?! action: %s",
|
|
$src, $task_ref->{action}
|
|
);
|
|
}
|
|
|
|
# Remove the link
|
|
debug(1, 0, "MV: $src -> $dst");
|
|
|
|
my $task = {
|
|
action => 'move',
|
|
type => 'file',
|
|
path => $src,
|
|
dest => $dst,
|
|
};
|
|
push @{ $self->{tasks} }, $task;
|
|
|
|
# FIXME: do we need this for anything?
|
|
#$self->{mv_task_for}{$file} = $task;
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
#############################################################################
|
|
#
|
|
# End of methods; subroutines follow.
|
|
# FIXME: Ideally these should be in a separate module.
|
|
|
|
|
|
#===== PRIVATE SUBROUTINE ===================================================
|
|
# Name : internal_error()
|
|
# Purpose : output internal error message in a consistent form and die
|
|
# Parameters: $message => error message to output
|
|
# Returns : n/a
|
|
# Throws : n/a
|
|
# Comments : none
|
|
#============================================================================
|
|
sub internal_error {
|
|
my ($format, @args) = @_;
|
|
my $error = sprintf($format, @args);
|
|
my $stacktrace = Carp::longmess();
|
|
die <<EOF;
|
|
|
|
$ProgramName: INTERNAL ERROR: $error$stacktrace
|
|
|
|
This _is_ a bug. Please submit a bug report so we can fix it! :-)
|
|
See http://www.gnu.org/software/stow/ for how to do this.
|
|
EOF
|
|
}
|
|
|
|
=head1 BUGS
|
|
|
|
=head1 SEE ALSO
|
|
|
|
=cut
|
|
|
|
1;
|
|
|
|
# Local variables:
|
|
# mode: perl
|
|
# cperl-indent-level: 4
|
|
# end:
|
|
# vim: ft=perl
|
|
|
|
#############################################################################
|
|
# Default global list of ignore regexps follows
|
|
# (automatically appended by the Makefile)
|
|
|
|
__DATA__
|