155 lines
3.9 KiB
Perl
Executable file
155 lines
3.9 KiB
Perl
Executable file
#! @perl@ -w
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use strict;
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use Cwd 'abs_path';
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use IO::Handle;
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use File::Path;
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use File::Basename;
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STDOUT->autoflush(1);
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my $out = $ENV{"out"};
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my @pathsToLink = split ' ', $ENV{"pathsToLink"};
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sub isInPathsToLink {
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my $path = shift;
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$path = "/" if $path eq "";
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foreach my $elem (@pathsToLink) {
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return 1 if
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$elem eq "/" ||
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(substr($path, 0, length($elem)) eq $elem
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&& (($path eq $elem) || (substr($path, length($elem), 1) eq "/")));
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}
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return 0;
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}
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# For each activated package, determine what symlinks to create.
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my %symlinks;
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$symlinks{""} = ""; # create root directory
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sub findFiles;
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sub findFilesInDir {
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my ($relName, $target, $ignoreCollisions) = @_;
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opendir DIR, "$target" or die "cannot open `$target': $!";
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my @names = readdir DIR or die;
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closedir DIR;
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foreach my $name (@names) {
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next if $name eq "." || $name eq "..";
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findFiles("$relName/$name", "$target/$name", $name, $ignoreCollisions);
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}
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}
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sub findFiles {
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my ($relName, $target, $baseName, $ignoreCollisions) = @_;
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# Urgh, hacky...
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return if
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$relName eq "/propagated-build-inputs" ||
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$relName eq "/nix-support" ||
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$relName =~ /info\/dir/ ||
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( $relName =~ /^\/share\/mime\// && !( $relName =~ /^\/share\/mime\/packages/ ) ) ||
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$baseName eq "perllocal.pod" ||
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$baseName eq "log";
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my $oldTarget = $symlinks{$relName};
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if (!defined $oldTarget) {
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$symlinks{$relName} = $target;
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return;
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}
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unless (-d $target && ($oldTarget eq "" || -d $oldTarget)) {
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if ($ignoreCollisions) {
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warn "collision between `$target' and `$oldTarget'" if $ignoreCollisions == 1;
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return;
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} else {
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die "collision between `$target' and `$oldTarget'";
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}
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}
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findFilesInDir($relName, $oldTarget, $ignoreCollisions) unless $oldTarget eq "";
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findFilesInDir($relName, $target, $ignoreCollisions);
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$symlinks{$relName} = ""; # denotes directory
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}
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my %done;
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my %postponed;
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sub addPkg;
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sub addPkg($;$) {
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my $pkgDir = shift;
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my $ignoreCollisions = shift;
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return if (defined $done{$pkgDir});
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$done{$pkgDir} = 1;
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findFiles("", "$pkgDir", "", $ignoreCollisions);
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my $propagatedFN = "$pkgDir/nix-support/propagated-user-env-packages";
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if (-e $propagatedFN) {
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open PROP, "<$propagatedFN" or die;
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my $propagated = <PROP>;
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close PROP;
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my @propagated = split ' ', $propagated;
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foreach my $p (@propagated) {
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$postponed{$p} = 1 unless defined $done{$p};
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}
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}
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}
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# Symlink to the packages that have been installed explicitly by the user.
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my @args = split ' ', $ENV{"paths"};
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foreach my $pkgDir (@args) {
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addPkg($pkgDir, $ENV{"ignoreCollisions"} eq "1") if -e $pkgDir;
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}
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# Symlink to the packages that have been "propagated" by packages
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# installed by the user (i.e., package X declares that it want Y
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# installed as well). We do these later because they have a lower
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# priority in case of collisions.
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while (scalar(keys %postponed) > 0) {
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my @pkgDirs = keys %postponed;
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%postponed = ();
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foreach my $pkgDir (sort @pkgDirs) {
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addPkg($pkgDir, 2);
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}
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}
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# Create the symlinks.
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my $nrLinks = 0;
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foreach my $relName (sort keys %symlinks) {
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my $target = $symlinks{$relName};
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my $abs = "$out/$relName";
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next unless isInPathsToLink $relName;
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if ($target eq "") {
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#print "creating directory $relName\n";
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mkpath $abs or die "cannot create directory `$abs': $!";
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} else {
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#print "creating symlink $relName to $target\n";
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symlink $target, $abs ||
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die "error creating link `$abs': $!";
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$nrLinks++;
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}
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}
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print STDERR "created $nrLinks symlinks in user environment\n";
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my $manifest = $ENV{"manifest"};
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if ($manifest) {
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symlink($manifest, "$out/manifest") or die "cannot create manifest";
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}
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