3d05166086
allow switching between them (NIX-80).
Example: two versions of Pan:
$ nix-env -q pan
pan-0.128
pan-0.14.2.91
$ readlink $(which pan)
/nix/store/l38jrbilw269drpjkx7kinhrxj6fjh59-pan-0.14.2.91/bin/pan
At most one of them can be active any given time. Assuming than
0.14.2.91 is active, you can active 0.128 as follows:
$ nix-env --set-flag active false pan-0.14.2.91
$ nix-env --set-flag active true pan-0.128
$ readlink $(which pan)
/nix/store/nziqwnlzy7xl385kglxhg75pfl5i936n-pan-0.128/bin/pan
More flags to follow.
140 lines
3.5 KiB
Perl
Executable file
140 lines
3.5 KiB
Perl
Executable file
#! @perl@ -w
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use strict;
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use Cwd;
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use IO::Handle;
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STDOUT->autoflush(1);
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my $out = $ENV{"out"};
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mkdir "$out", 0755 || die "error creating $out";
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my $symlinks = 0;
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# For each activated package, create symlinks.
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sub createLinks {
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my $srcDir = shift;
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my $dstDir = shift;
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my $ignoreCollisions = shift;
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my @srcFiles = glob("$srcDir/*");
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foreach my $srcFile (@srcFiles) {
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my $baseName = $srcFile;
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$baseName =~ s/^.*\///g; # strip directory
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my $dstFile = "$dstDir/$baseName";
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# Urgh, hacky...
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if ($srcFile =~ /\/propagated-build-inputs$/ ||
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$srcFile =~ /\/nix-support$/ ||
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$srcFile =~ /\/perllocal.pod$/ ||
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$srcFile =~ /\/info\/dir$/ ||
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$srcFile =~ /\/log$/)
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{
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# Do nothing.
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}
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elsif (-d $srcFile) {
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lstat $dstFile;
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if (-d _) {
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createLinks($srcFile, $dstFile, $ignoreCollisions);
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}
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elsif (-l _) {
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my $target = readlink $dstFile or die;
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if (!-d $target) {
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die "collission between directory `$srcFile' and non-directory `$target'";
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}
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unlink $dstFile or die "error unlinking `$dstFile': $!";
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mkdir $dstFile, 0755 ||
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die "error creating directory `$dstFile': $!";
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createLinks($target, $dstFile, $ignoreCollisions);
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createLinks($srcFile, $dstFile, $ignoreCollisions);
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}
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else {
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symlink($srcFile, $dstFile) ||
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die "error creating link `$dstFile': $!";
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$symlinks++;
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}
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}
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elsif (-l $dstFile) {
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if (!$ignoreCollisions) {
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my $target = readlink $dstFile;
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die "collission between `$srcFile' and `$target'";
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}
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}
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else {
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symlink($srcFile, $dstFile) ||
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die "error creating link `$dstFile': $!";
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$symlinks++;
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}
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}
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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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# print "symlinking $pkgDir\n";
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createLinks("$pkgDir", "$out", $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 @paths = split ' ', $ENV{"derivations"};
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my @active = split ' ', $ENV{"active"};
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die if scalar @paths != scalar @active;
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for (my $n = 0; $n < scalar @paths; $n++) {
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my $pkgDir = $paths[$n];
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my $isActive = $active[$n];
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addPkg($pkgDir, 0) if $isActive ne "false";
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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, 1);
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}
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}
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print STDERR "created $symlinks symlinks in user environment\n";
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symlink($ENV{"manifest"}, "$out/manifest") or die "cannot create manifest";
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