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Adam Spiers
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464
Stow.pm
Executable file
464
Stow.pm
Executable file
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#!/usr/bin/perl
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# GNU Stow - manage the installation of multiple software packages
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# Copyright (C) 1993, 1994, 1995, 1996 by Bob Glickstein
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# Copyright (C) 2000,2001 Guillaume Morin
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# Copyright (C) 2005 Adam Spiers
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program 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, write to the Free Software
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#
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# $Id$
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# $Source$
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# $Date$
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# $Author$
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#####################################################################
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# Wed Nov 23 2005 Adam Spiers <stow@adamspiers.org>
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# Hacked to ignore anything listed in ~/.cvsignore
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#
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# Thu Dec 29 2005 Adam Spiers <stow@adamspiers.org>
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# Hacked into a Perl module
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#####################################################################
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use strict;
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use warnings;
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use File::Spec;
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use FindBin qw($RealBin $RealScript);
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use Getopt::Long;
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use lib "$RealBin/../lib/perl5";
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use Sh 'glob_to_re';
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my $ignore_file = File::Spec->join($ENV{HOME}, ".cvsignore");
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my $ignore_re = get_ignore_re_from_file($ignore_file);
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require 5.005;
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our %opts;
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sub SetOptions {
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%opts = @_;
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}
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sub Init {
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# Changing dirs helps a lot when soft links are used
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my $current_dir = &getcwd;
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if ($opts{stow}) {
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chdir($opts{stow}) || die "Cannot chdir to target tree $opts{stow} ($!)\n";
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}
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# This prevents problems if $opts{target} was supplied as a relative path
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$opts{stow} = &getcwd;
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chdir($current_dir) || die "Your directory does not seem to exist anymore ($!)\n";
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$opts{target} = Stow::parent($opts{stow}) unless $opts{target};
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chdir($opts{target}) || die "Cannot chdir to target tree $opts{target} ($!)\n";
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$opts{target} = &getcwd;
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}
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sub CheckCollections {
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foreach my $package (@_) {
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$package =~ s,/+$,,; # delete trailing slashes
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if ($package =~ m,/,) {
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die "$RealScript: slashes not permitted in package names\n";
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}
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}
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}
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sub CommonParent {
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my($dir1, $dir2) = @_;
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my($result, $x);
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my(@d1) = split(/\/+/, $dir1);
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my(@d2) = split(/\/+/, $dir2);
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while (@d1 && @d2 && (($x = shift(@d1)) eq shift(@d2))) {
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$result .= "$x/";
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}
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chop($result);
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return $result;
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}
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# Find the relative patch between
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# two paths given as arguments.
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sub RelativePath {
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my($a, $b) = @_;
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my($c) = &CommonParent($a, $b);
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my(@a) = split(/\/+/, $a);
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my(@b) = split(/\/+/, $b);
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my(@c) = split(/\/+/, $c);
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# if $c == "/something", scalar(@c) >= 2
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# but if $c == "/", scalar(@c) == 0
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# but we want 1
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my $length = scalar(@c) ? scalar(@c) : 1;
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splice(@a, 0, $length);
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splice(@b, 0, $length);
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unshift(@b, (('..') x (@a + 0)));
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&JoinPaths(@b);
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}
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# Basically concatenates the paths given
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# as arguments
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sub JoinPaths {
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my(@paths, @parts);
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my ($x, $y);
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my($result) = '';
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$result = '/' if ($_[0] =~ /^\//);
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foreach $x (@_) {
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@parts = split(/\/+/, $x);
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foreach $y (@parts) {
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push(@paths, $y) if ($y ne "");
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}
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}
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$result .= join('/', @paths);
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return $result;
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}
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sub Unstow {
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my($targetdir, $stow, $Collections) = @_;
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my($pure, $othercollection) = (1, '');
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my($subpure, $subother);
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my($empty) = (1);
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my(@puresubdirs);
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return (0, '') if (&JoinPaths($opts{target}, $targetdir) eq $opts{stow});
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return (0, '') if (-e &JoinPaths($opts{target}, $targetdir, '.stow'));
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warn sprintf("Unstowing in %s\n", &JoinPaths($opts{target}, $targetdir))
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if ($opts{verbose} > 1);
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my $dir = &JoinPaths($opts{target}, $targetdir);
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if (!opendir(DIR, $dir)) {
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warn "Warning: $RealScript: Cannot read directory \"$dir\" ($!). Stow might leave some links. If you think, it does. Rerun Stow with appropriate rights.\n";
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}
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my @contents = readdir(DIR);
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closedir(DIR);
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foreach my $content (@contents) {
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next if (($content eq '.') || ($content eq '..'));
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$empty = 0;
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if (-l &JoinPaths($opts{target}, $targetdir, $content)) {
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(my $linktarget = readlink(&JoinPaths($opts{target},
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$targetdir,
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$content)))
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|| die sprintf("%s: Cannot read link %s (%s)\n",
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$RealScript,
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&JoinPaths($opts{target}, $targetdir, $content),
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$!);
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if (my $stowmember = &FindStowMember(&JoinPaths($opts{target},
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$targetdir),
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$linktarget)) {
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my @stowmember = split(/\/+/, $stowmember);
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my $collection = shift(@stowmember);
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if (grep(($collection eq $_), @$Collections)) {
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&DoUnlink(&JoinPaths($opts{target}, $targetdir, $content));
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} elsif ($pure) {
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if ($othercollection) {
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$pure = 0 if ($collection ne $othercollection);
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} else {
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$othercollection = $collection;
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}
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}
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} else {
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$pure = 0;
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}
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} elsif (-d &JoinPaths($opts{target}, $targetdir, $content)) {
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($subpure, $subother) = &Unstow(&JoinPaths($targetdir, $content),
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&JoinPaths('..', $stow));
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if ($subpure) {
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push(@puresubdirs, "$content/$subother");
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}
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if ($pure) {
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if ($subpure) {
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if ($othercollection) {
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if ($subother) {
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if ($othercollection ne $subother) {
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$pure = 0;
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}
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}
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} elsif ($subother) {
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$othercollection = $subother;
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}
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} else {
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$pure = 0;
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}
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}
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} else {
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$pure = 0;
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}
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}
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# This directory was an initially empty directory therefore
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# We do not remove it.
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$pure = 0 if $empty;
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if ((!$pure || !$targetdir) && @puresubdirs) {
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&CoalesceTrees($targetdir, $stow, @puresubdirs);
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}
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($pure, $othercollection);
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}
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sub CoalesceTrees {
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my($parent, $stow, @trees) = @_;
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foreach my $x (@trees) {
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my ($tree, $collection) = ($x =~ /^(.*)\/(.*)/);
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&EmptyTree(&JoinPaths($opts{target}, $parent, $tree));
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&DoRmdir(&JoinPaths($opts{target}, $parent, $tree));
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if ($collection) {
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&DoLink(&JoinPaths($stow, $collection, $parent, $tree),
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&JoinPaths($opts{target}, $parent, $tree));
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}
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}
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}
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sub EmptyTree {
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my($dir) = @_;
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opendir(DIR, $dir)
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|| die "$RealScript: Cannot read directory \"$dir\" ($!)\n";
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my @contents = readdir(DIR);
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closedir(DIR);
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foreach my $content (@contents) {
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next if (($content eq '.') || ($content eq '..'));
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if (-l &JoinPaths($dir, $content)) {
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&DoUnlink(&JoinPaths($dir, $content));
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} elsif (-d &JoinPaths($dir, $content)) {
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&EmptyTree(&JoinPaths($dir, $content));
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&DoRmdir(&JoinPaths($dir, $content));
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} else {
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&DoUnlink(&JoinPaths($dir, $content));
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}
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}
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}
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sub StowContents {
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my($dir, $stow) = @_;
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warn "Stowing contents of $dir\n" if ($opts{verbose} > 1);
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my $joined = &JoinPaths($opts{stow}, $dir);
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opendir(DIR, $joined)
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|| die "$RealScript: Cannot read directory \"$dir\" ($!)\n";
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my @contents = readdir(DIR);
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closedir(DIR);
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foreach my $content (@contents) {
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# Wed Nov 23 2005 Adam Spiers
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# hack to ignore stuff in ~/.cvsignore
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next if $content eq '.' or $content eq '..';
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if ($content =~ $ignore_re) {
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# FIXME: We assume -r implies the open succeeded but this is not
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# true if we're stowing cvs as .cvsignore only gets created
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# halfway through.
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warn "Ignoring $joined/$content", (-r $ignore_file ? " via $ignore_file" : ""), "\n"
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if $opts{verbose} > 2;
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next;
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}
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if (-d &JoinPaths($opts{stow}, $dir, $content)) {
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&StowDir(&JoinPaths($dir, $content), $stow);
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} else {
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&StowNondir(&JoinPaths($dir, $content), $stow);
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}
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}
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}
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sub StowDir {
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my($dir, $stow) = @_;
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my(@dir) = split(/\/+/, $dir);
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my($collection) = shift(@dir);
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my($subdir) = join('/', @dir);
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my($linktarget, $stowsubdir);
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warn "Stowing directory $dir\n" if ($opts{verbose} > 1);
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if (-l &JoinPaths($opts{target}, $subdir)) {
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($linktarget = readlink(&JoinPaths($opts{target}, $subdir)))
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|| die sprintf("%s: Could not read link %s (%s)\n",
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$RealScript,
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&JoinPaths($opts{target}, $subdir),
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$!);
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($stowsubdir =
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&FindStowMember(sprintf('%s/%s', $opts{target},
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join('/', @dir[0..($#dir - 1)])),
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$linktarget))
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|| (&Conflict($dir, $subdir, 1), return);
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if (-e &JoinPaths($opts{stow}, $stowsubdir)) {
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if ($stowsubdir eq $dir) {
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warn sprintf("%s already points to %s\n",
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&JoinPaths($opts{target}, $subdir),
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&JoinPaths($opts{stow}, $dir))
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if ($opts{verbose} > 2);
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return;
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}
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if (-d &JoinPaths($opts{stow}, $stowsubdir)) {
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&DoUnlink(&JoinPaths($opts{target}, $subdir));
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&DoMkdir(&JoinPaths($opts{target}, $subdir));
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&StowContents($stowsubdir, &JoinPaths('..', $stow));
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&StowContents($dir, &JoinPaths('..', $stow));
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} else {
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(&Conflict($dir, $subdir, 2), return);
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}
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} else {
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&DoUnlink(&JoinPaths($opts{target}, $subdir));
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&DoLink(&JoinPaths($stow, $dir),
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&JoinPaths($opts{target}, $subdir));
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}
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} elsif (-e &JoinPaths($opts{target}, $subdir)) {
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if (-d &JoinPaths($opts{target}, $subdir)) {
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&StowContents($dir, &JoinPaths('..', $stow));
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} else {
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&Conflict($dir, $subdir, 3);
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}
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} else {
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&DoLink(&JoinPaths($stow, $dir),
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&JoinPaths($opts{target}, $subdir));
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}
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}
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sub StowNondir {
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my($file, $stow) = @_;
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my(@file) = split(/\/+/, $file);
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my($collection) = shift(@file);
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my($subfile) = join('/', @file);
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my($linktarget, $stowsubfile);
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if (-l &JoinPaths($opts{target}, $subfile)) {
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($linktarget = readlink(&JoinPaths($opts{target}, $subfile)))
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|| die sprintf("%s: Could not read link %s (%s)\n",
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$RealScript,
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&JoinPaths($opts{target}, $subfile),
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$!);
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($stowsubfile =
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&FindStowMember(sprintf('%s/%s', $opts{target},
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join('/', @file[0..($#file - 1)])),
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$linktarget))
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|| (&Conflict($file, $subfile, 4), return);
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if (-e &JoinPaths($opts{stow}, $stowsubfile)) {
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(&Conflict($file, $subfile, 5), return)
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unless ($stowsubfile eq $file);
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warn sprintf("%s already points to %s\n",
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&JoinPaths($opts{target}, $subfile),
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&JoinPaths($opts{stow}, $file))
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if ($opts{verbose} > 2);
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} else {
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&DoUnlink(&JoinPaths($opts{target}, $subfile));
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&DoLink(&JoinPaths($stow, $file),
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&JoinPaths($opts{target}, $subfile));
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}
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} elsif (-e &JoinPaths($opts{target}, $subfile)) {
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&Conflict($file, $subfile, 6);
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} else {
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&DoLink(&JoinPaths($stow, $file),
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&JoinPaths($opts{target}, $subfile));
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}
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}
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sub DoUnlink {
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my($file) = @_;
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||||||
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warn "UNLINK $file\n" if $opts{verbose};
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||||||
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(unlink($file) || die "$RealScript: Could not unlink $file ($!)\n")
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||||||
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unless $opts{not_really};
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||||||
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}
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||||||
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sub DoRmdir {
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my($dir) = @_;
|
||||||
|
|
||||||
|
warn "RMDIR $dir\n" if $opts{verbose};
|
||||||
|
(rmdir($dir) || die "$RealScript: Could not rmdir $dir ($!)\n")
|
||||||
|
unless $opts{not_really};
|
||||||
|
}
|
||||||
|
|
||||||
|
sub DoLink {
|
||||||
|
my($target, $name) = @_;
|
||||||
|
|
||||||
|
warn "LINK $name to $target\n" if $opts{verbose};
|
||||||
|
(symlink($target, $name) ||
|
||||||
|
die "$RealScript: Could not symlink $name to $target ($!)\n")
|
||||||
|
unless $opts{not_really};
|
||||||
|
}
|
||||||
|
|
||||||
|
sub DoMkdir {
|
||||||
|
my($dir) = @_;
|
||||||
|
|
||||||
|
warn "MKDIR $dir\n" if $opts{verbose};
|
||||||
|
(mkdir($dir, 0777)
|
||||||
|
|| die "$RealScript: Could not make directory $dir ($!)\n")
|
||||||
|
unless $opts{not_really};
|
||||||
|
}
|
||||||
|
|
||||||
|
sub Conflict {
|
||||||
|
my($a, $b, $type) = @_;
|
||||||
|
|
||||||
|
my $src = &JoinPaths($opts{stow}, $a);
|
||||||
|
my $dst = &JoinPaths($opts{target}, $b);
|
||||||
|
|
||||||
|
if ($opts{conflicts}) {
|
||||||
|
warn "CONFLICT: $src vs. $dst", ($type ? " ($type)" : ''), "\n";
|
||||||
|
#system "ls -l $src $dst";
|
||||||
|
} else {
|
||||||
|
die "$RealScript: CONFLICT: $src vs. $dst", ($type ? " ($type)" : ''), "\n";
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
sub FindStowMember {
|
||||||
|
my($start, $path) = @_;
|
||||||
|
my(@x) = split(/\/+/, $start);
|
||||||
|
my(@path) = split(/\/+/, $path);
|
||||||
|
my($x);
|
||||||
|
my(@d) = split(/\/+/, $opts{stow});
|
||||||
|
|
||||||
|
while (@path) {
|
||||||
|
$x = shift(@path);
|
||||||
|
if ($x eq '..') {
|
||||||
|
pop(@x);
|
||||||
|
return '' unless @x;
|
||||||
|
} elsif ($x) {
|
||||||
|
push(@x, $x);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
while (@x && @d) {
|
||||||
|
if (($x = shift(@x)) ne shift(@d)) {
|
||||||
|
return '';
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return '' if @d;
|
||||||
|
return join('/', @x);
|
||||||
|
}
|
||||||
|
|
||||||
|
sub parent {
|
||||||
|
my($path) = join('/', @_);
|
||||||
|
my(@elts) = split(/\/+/, $path);
|
||||||
|
pop(@elts);
|
||||||
|
return join('/', @elts);
|
||||||
|
}
|
||||||
|
|
||||||
|
sub get_ignore_re_from_file {
|
||||||
|
my ($file) = @_;
|
||||||
|
# Bootstrap issue - first time we stow, we will be stowing
|
||||||
|
# .cvsignore so it won't exist in ~ yet. At that time, use
|
||||||
|
# a sensible default instead.
|
||||||
|
open(REGEXPS, $file) or return qr!\.cfgsave\.|^(CVS)$!;
|
||||||
|
my @regexps;
|
||||||
|
while (<REGEXPS>) {
|
||||||
|
chomp;
|
||||||
|
push @regexps, glob_to_re($_);
|
||||||
|
}
|
||||||
|
close(REGEXPS);
|
||||||
|
my $re = join '|', @regexps;
|
||||||
|
warn "#% ignore regexp is $re\n" if $opts{verbose};
|
||||||
|
return qr/$re/;
|
||||||
|
}
|
||||||
|
|
||||||
|
1;
|
||||||
Loading…
Reference in a new issue