use strict; use Cwd; use IO::Handle; STDOUT->autoflush(1); my $out = $ENV{"out"}; mkdir "$out", 0755 || die "error creating $out"; my $symlinks = 0; my %priorities; # For each activated package, create symlinks. sub createLinks { my $srcDir = shift; my $dstDir = shift; my $priority = shift; my @srcFiles = glob("$srcDir/*"); foreach my $srcFile (@srcFiles) { my $baseName = $srcFile; $baseName =~ s/^.*\///g; # strip directory my $dstFile = "$dstDir/$baseName"; # The files below are special-cased so that they don't show up # in user profiles, either because they are useless, or # because they would cause pointless collisions (e.g., each # Python package brings its own # `$out/lib/pythonX.Y/site-packages/easy-install.pth'.) # Urgh, hacky... if ($srcFile =~ /\/propagated-build-inputs$/ || $srcFile =~ /\/nix-support$/ || $srcFile =~ /\/perllocal.pod$/ || $srcFile =~ /\/easy-install.pth$/ || $srcFile =~ /\/site.py$/ || $srcFile =~ /\/site.pyc$/ || $srcFile =~ /\/info\/dir$/ || $srcFile =~ /\/log$/) { # Do nothing. } elsif (-d $srcFile) { lstat $dstFile; if (-d _) { createLinks($srcFile, $dstFile, $priority); } elsif (-l _) { my $target = readlink $dstFile or die; if (!-d $target) { die "collission between directory `$srcFile' and non-directory `$target'"; } unlink $dstFile or die "error unlinking `$dstFile': $!"; mkdir $dstFile, 0755 || die "error creating directory `$dstFile': $!"; createLinks($target, $dstFile, $priorities{$dstFile}); createLinks($srcFile, $dstFile, $priority); } else { symlink($srcFile, $dstFile) || die "error creating link `$dstFile': $!"; $priorities{$dstFile} = $priority; $symlinks++; } } else { if (-l $dstFile) { my $target = readlink $dstFile; my $prevPriority = $priorities{$dstFile}; die ( "collission between `$srcFile' and `$target'; " . "use `nix-env --set-flag " . "priority NUMBER PKGNAME' to change the priority of " . "one of the conflicting packages\n" ) if $prevPriority == $priority; next if $prevPriority < $priority; unlink $dstFile or die; } symlink($srcFile, $dstFile) || die "error creating link `$dstFile': $!"; $priorities{$dstFile} = $priority; $symlinks++; } } } my %done; my %postponed; sub addPkg; sub addPkg { my $pkgDir = shift; my $priority = shift; return if (defined $done{$pkgDir}); $done{$pkgDir} = 1; # print "symlinking $pkgDir\n"; createLinks("$pkgDir", "$out", $priority); my $propagatedFN = "$pkgDir/nix-support/propagated-user-env-packages"; if (-e $propagatedFN) { open PROP, "<$propagatedFN" or die; my $propagated = <PROP>; close PROP; my @propagated = split ' ', $propagated; foreach my $p (@propagated) { $postponed{$p} = 1 unless defined $done{$p}; } } } # Convert the stuff we get from the environment back into a coherent # data type. my @pkgs; my @derivations = split ' ', $ENV{"derivations"}; while (scalar @derivations) { my $active = shift @derivations; my $priority = shift @derivations; my $outputs = shift @derivations; for (my $n = 0; $n < $outputs; $n++) { my $path = shift @derivations; push @pkgs, { path => $path , active => $active ne "false" , priority => int($priority) }; } } # Symlink to the packages that have been installed explicitly by the # user. Process in priority order to reduce unnecessary # symlink/unlink steps. @pkgs = sort { $a->{priority} <=> $b->{priority} || $a->{path} cmp $b->{path} } @pkgs; foreach my $pkg (@pkgs) { #print $pkg, " ", $pkgs{$pkg}->{priority}, "\n"; addPkg($pkg->{path}, $pkg->{priority}) if $pkg->{active}; } # Symlink to the packages that have been "propagated" by packages # installed by the user (i.e., package X declares that it want Y # installed as well). We do these later because they have a lower # priority in case of collisions. my $priorityCounter = 1000; # don't care about collisions while (scalar(keys %postponed) > 0) { my @pkgDirs = keys %postponed; %postponed = (); foreach my $pkgDir (sort @pkgDirs) { addPkg($pkgDir, $priorityCounter++); } } print STDERR "created $symlinks symlinks in user environment\n"; symlink($ENV{"manifest"}, "$out/manifest.nix") or die "cannot create manifest";