numerous refactorings and comments to improve legibility
This commit is contained in:
adam
Adam Spiers
parent
d21d1dd629
commit
61a1944b81
257
Stow.pm
257
Stow.pm
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@ -32,12 +32,15 @@
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# Hacked into a Perl module
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#####################################################################
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package Stow;
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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 $RealScript);
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use Getopt::Long;
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use POSIX;
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use lib "$RealBin/../lib/perl5";
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use Sh 'glob_to_re';
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@ -74,7 +77,7 @@ 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 "$RealScript: slashes not permitted in package names\n";
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die "$RealScript: slashes not permitted in package names ($package)\n";
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}
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}
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}
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@ -113,84 +116,112 @@ sub RelativePath {
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&JoinPaths(@b);
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}
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# Basically concatenates the paths given
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# as arguments
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# Concatenates the paths given as arguments, removing double slashes.
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sub JoinPaths {
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my(@paths, @parts);
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my ($x, $y);
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my($result) = '';
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# The code that was previously here from 1.3.3 was strangely complex
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# for no obvious reason. I (Adam) wrote a test suite and found this
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# drop-in replacement to behave identically.
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# my $result = join '/', @_;
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# $result =~ s!//!/!g;
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# return $result;
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# So does this, but is also portable.
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return File::Spec->join(@_);
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}
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$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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# This removes stow-controlled symlinks from $targetdir for the
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# packages in the %$to_unstow hash, and is called recursively to
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# process subdirectories. It returns XXX FIXME
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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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my($targetdir, $stow, $to_unstow) = @_;
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# Note $targetdir is relative to the top of the target hierarchy,
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# i.e. $opts{target}.
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#
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# $stow is the stow directory (the one containing the source
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# packages), and is always relative to $targetdir. So as we
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# recursively descend into $opts{target}, $stow gets longer because
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# we have to move up out of that hierarchy and back into the stow
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# directory.
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return (0, '') if (&JoinPaths($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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# Does this directory only contain symlinks to the packages we are
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# removing? We assume so and scan the directory until we find out
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# otherwise.
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my $pure = 1;
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# FIXME what is this?
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my $othercollection = '';
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# We assume $targetdir is empty until we find something.
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my $empty = 1;
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my $targetdirPath = &JoinPaths($opts{target}, $targetdir);
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return (0, '') if $targetdirPath eq $opts{stow};
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return (0, '') if -e &JoinPaths($targetdirPath, '.stow');
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warn "Unstowing in $targetdirPath\n"
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if $opts{verbose} > 1;
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if (!opendir(DIR, $targetdirPath)) {
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warn "Warning: $RealScript: Cannot read directory \"$targetdirPath\" ($!). 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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my @puresubdirs;
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foreach my $content (@contents) {
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next if (($content eq '.') || ($content eq '..'));
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next if ($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 $contentPath = &JoinPaths($targetdirPath, $content);
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if (-l $contentPath) {
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# We found a link; now let's see if we should remove it.
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my $linktarget = readlink $contentPath;
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$linktarget or die "$RealScript: Cannot read link $contentPath ($!)\n";
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# Does the link point to somewhere within the stow directory?
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my $stowmember = &FindStowMember(
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$targetdirPath,
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$linktarget,
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);
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if ($stowmember) {
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# Yes it does, but does it point within one of the package
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# collections we are unstowing?
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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 ($to_unstow->{$collection}) {
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# Yep, so get rid of it.
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&DoUnlink($contentPath);
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} else {
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# No, it points to another package collection.
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if ($pure) {
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if ($othercollection) {
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$pure = 0 if ($collection ne $othercollection);
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$pure = 0 if $collection ne $othercollection;
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} else {
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$othercollection = $collection;
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}
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}
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}
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} else {
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$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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}
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elsif (-d $contentPath) {
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# recurse
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my ($subpure, $subother) = &Unstow(
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&JoinPaths($targetdir, $content),
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&JoinPaths('..', $stow),
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$to_unstow,
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);
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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 $subother) {
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if ($subother and $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 = $subother;
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}
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@ -203,12 +234,12 @@ sub Unstow {
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}
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}
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# This directory was an initially empty directory therefore
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# We do not remove it.
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# we do not remove it.
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$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, $othercollection);
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return ($pure, $othercollection);
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}
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sub CoalesceTrees {
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@ -248,7 +279,7 @@ sub EmptyTree {
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sub StowContents {
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my($dir, $stow) = @_;
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warn "Stowing contents of $dir\n" if ($opts{verbose} > 1);
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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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@ -278,51 +309,53 @@ 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($subdir) = join('/', @dir);
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my($subdir) = &JoinPaths('/', @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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my $subdirPath = &JoinPaths($opts{target}, $subdir);
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if (-l $subdirPath) {
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($linktarget = readlink($subdirPath))
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|| die "$RealScript: Could not read link $subdirPath ($!)\n";
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my $stowsubdir = &FindStowMember(
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&JoinPaths($opts{target}, @dir[0..($#dir - 1)]),
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$linktarget
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);
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unless ($stowsubdir) {
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&Conflict($dir, $subdir, 1);
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return;
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}
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if (-e &JoinPaths($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}, $subdir),
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$subdirPath,
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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}, $subdir));
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&DoUnlink($subdirPath);
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&DoMkdir($subdirPath);
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&StowContents($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}, $subdir));
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&DoUnlink($subdirPath);
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&DoLink(&JoinPaths($stow, $dir),
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&JoinPaths($opts{target}, $subdir));
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$subdirPath);
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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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} elsif (-e $subdirPath) {
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if (-d $subdirPath) {
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&StowContents($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}, $subdir));
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$subdirPath);
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}
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}
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@ -330,37 +363,36 @@ 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($subfile) = join('/', @file);
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my($subfile) = &JoinPaths(@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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my $subfilePath = &JoinPaths($opts{target}, $subfile);
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if (-l $subfilePath) {
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my $linktarget = readlink($subfilePath);
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$linktarget or die "$RealScript: Could not read link $subfilePath ($!)\n";
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my $stowsubfile = &FindStowMember(
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&JoinPaths($opts{target}, @file[0..($#file - 1)]),
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$linktarget
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);
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if (! $stowsubfile) {
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&Conflict($file, $subfile, 4);
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return;
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}
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if (-e &JoinPaths($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}, $subfile),
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$subfilePath,
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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}, $subfile));
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&DoUnlink($subfilePath);
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&DoLink(&JoinPaths($stow, $file), $subfilePath);
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}
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} elsif (-e &JoinPaths($opts{target}, $subfile)) {
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} elsif (-e $subfilePath) {
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&Conflict($file, $subfile, 6);
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} else {
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&DoLink(&JoinPaths($stow, $file),
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&JoinPaths($opts{target}, $subfile));
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&DoLink(&JoinPaths($stow, $file), $subfilePath);
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}
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}
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@ -412,29 +444,40 @@ sub Conflict {
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}
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}
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# Given an absolute starting directory and a relative path obtained by
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# calling readlink() on a symlink in that starting directory,
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# FindStowMember() figures out whether the symlink points to somewhere
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# within the stow directory. If so, it returns the target of the
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# symlink relative to the stow directory, otherwise it returns ''.
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sub FindStowMember {
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my($start, $path) = @_;
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my(@x) = split(/\/+/, $start);
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my(@path) = split(/\/+/, $path);
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my($x);
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my(@d) = split(/\/+/, $opts{stow});
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my($startDir, $targetPath) = @_;
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my @startDirSegments = split(/\/+/, $startDir);
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my @targetSegments = split(/\/+/, $targetPath);
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my @stowDirSegments = split(/\/+/, $opts{stow});
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while (@path) {
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$x = shift(@path);
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# Start in $startDir and navigate to target, one path segment at a time.
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my @current = @startDirSegments;
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while (@targetSegments) {
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my $x = shift(@targetSegments);
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if ($x eq '..') {
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pop(@x);
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return '' unless @x;
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pop(@current);
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return '' unless @current; # We can't go higher than /, must be
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# an invalid symlink.
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} elsif ($x) {
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push(@x, $x);
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push(@current, $x);
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}
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}
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while (@x && @d) {
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if (($x = shift(@x)) ne shift(@d)) {
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# Now @current describes the absolute path to the symlink's target,
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# so if @current and @stowDirSegments have a common prefix, the
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# symlink points within the stow directory.
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while (@current && @stowDirSegments) {
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if (shift(@current) ne shift(@stowDirSegments)) {
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return '';
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}
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}
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return '' if @d;
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return join('/', @x);
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return '' if @stowDirSegments;
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return join('/', @current);
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}
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sub parent {
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