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#! @perl@ -w
use strict;
use Cwd 'abs_path';
use IO::Handle;
use File::Path;
use File::Basename;
STDOUT->autoflush(1);
my $out = $ENV{"out"};
mkdir "$out", 0755 || die "error creating $out";
my $symlinks = 0;
my @pathsToLink = split ' ', $ENV{"pathsToLink"};
sub isInPathsToLink {
my $path = shift;
$path = "/" if $path eq "";
foreach my $elem (@pathsToLink) {
return 1 if substr($path, 0, length($elem)) eq $elem;
}
return 0;
}
sub symLinkMkdir {
my $src = shift;
my $dst = shift;
my $dir = dirname $dst;
mkpath $dir;
symlink($src, $dst) ||
die "error creating link `$dst': $!";
$symlinks++;
}
# For each activated package, create symlinks.
sub createLinks {
my $relName = shift;
my $srcDir = shift;
my $dstDir = shift;
my $ignoreCollisions = shift;
my @srcFiles = glob("$srcDir/*");
foreach my $srcFile (@srcFiles) {
my $baseName = $srcFile;
$baseName =~ s/^.*\///g; # strip directory
my $dstFile = "$dstDir/$baseName";
my $relName2 = "$relName/$baseName";
# Urgh, hacky...
if ($srcFile =~ /\/propagated-build-inputs$/ ||
$srcFile =~ /\/nix-support$/ ||
$srcFile =~ /\/perllocal.pod$/ ||
$srcFile =~ /\/info\/dir$/ ||
( $relName2 =~ /^\/share\/mime\// && !( $relName2 =~ /^\/share\/mime\/packages/ ) ) ||
$srcFile =~ /\/log$/)
{
# Do nothing.
}
elsif (-d $srcFile) {
if (!isInPathsToLink($relName2)) {
# This path is not in the list of paths to link, but
# some of its children may be.
createLinks($relName2, $srcFile, $dstFile, $ignoreCollisions);
next;
}
lstat $dstFile;
if (-d _) {
createLinks($relName2, $srcFile, $dstFile, $ignoreCollisions);
}
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': $!";
mkpath $dstFile;
createLinks($relName2, $target, $dstFile, $ignoreCollisions);
createLinks($relName2, $srcFile, $dstFile, $ignoreCollisions);
}
else {
symLinkMkdir $srcFile, $dstFile;
}
}
elsif (-l $dstFile) {
my $oldTarget = readlink $dstFile;
my $oldTargetReal = abs_path $oldTarget;
my $newTarget = $srcFile;
my $newTargetReal = abs_path $newTarget;
unless ($newTargetReal eq $oldTargetReal) {
if ($ignoreCollisions) {
warn "collision between `$newTarget' and `$oldTarget'\n";
}
else {
die "collision between `$newTarget' and `$oldTarget'";
}
}
}
else {
next unless isInPathsToLink($relName2);
symLinkMkdir $srcFile, $dstFile;
}
}
}
my %done;
my %postponed;
sub addPkg;
sub addPkg($;$) {
my $pkgDir = shift;
my $ignoreCollisions = shift;
return if (defined $done{$pkgDir});
$done{$pkgDir} = 1;
# print "symlinking $pkgDir\n";
createLinks("", "$pkgDir", "$out", $ignoreCollisions);
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 $p (@propagated) {
print "$pkgDir propagates $p\n";
$postponed{$p} = 1 unless defined $done{$p};
}
}
}
# Symlink to the packages that have been installed explicitly by the user.
my @args = split ' ', $ENV{"paths"};
foreach my $pkgDir (@args) {
addPkg($pkgDir, $ENV{"ignoreCollisions"} eq "1");
}
# 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.
while (scalar(keys %postponed) > 0) {
my @pkgDirs = keys %postponed;
%postponed = ();
foreach my $pkgDir (sort @pkgDirs) {
addPkg($pkgDir, 1);
}
}
if (-x "$out/bin/update-mime-database" && -d "$out/share/mime/packages") {
system("$out/bin/update-mime-database -V $out/share/mime") == 0
or die "Can't update mime-database";
}
print STDERR "created $symlinks symlinks in user environment\n";
my $manifest = $ENV{"manifest"};
if ($manifest ne "") {
symlink($manifest, "$out/manifest") or die "cannot create manifest";
}
system("eval \"\$postBuild\"") == 0
or die "post-build hook failed";
|