mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-16 06:45:16 +01:00
283 lines
8.3 KiB
Perl
Executable file
283 lines
8.3 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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use File::Compare;
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use JSON::PP;
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STDOUT->autoflush(1);
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$SIG{__WARN__} = sub { warn "warning: ", @_ };
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$SIG{__DIE__} = sub { die "error: ", @_ };
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my $out = $ENV{"out"};
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my $extraPrefix = $ENV{"extraPrefix"};
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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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# Returns whether a path in one of the linked packages may contain
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# files in one of the elements of pathsToLink.
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sub hasPathsToLink {
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my $path = shift;
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foreach my $elem (@pathsToLink) {
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return 1 if
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$path eq "" ||
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(substr($elem, 0, length($path)) eq $path
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&& (($path eq $elem) || (substr($elem, length($path), 1) eq "/")));
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}
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return 0;
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}
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# Similar to `lib.isStorePath`
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sub isStorePath {
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my $path = shift;
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my $storePath = "@storeDir@";
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return substr($path, 0, 1) eq "/" && dirname($path) eq $storePath;
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}
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# For each activated package, determine what symlinks to create.
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my %symlinks;
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# Add all pathsToLink and all parent directories.
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#
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# For "/a/b/c" that will include
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# [ "", "/a", "/a/b", "/a/b/c" ]
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#
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# That ensures the whole directory tree needed by pathsToLink is
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# created as directories and not symlinks.
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$symlinks{""} = ["", 0];
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for my $p (@pathsToLink) {
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my @parts = split '/', $p;
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my $cur = "";
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for my $x (@parts) {
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$cur = $cur . "/$x";
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$cur = "" if $cur eq "/";
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$symlinks{$cur} = ["", 0];
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}
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}
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sub findFiles;
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sub findFilesInDir {
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my ($relName, $target, $ignoreCollisions, $checkCollisionContents, $priority) = @_;
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opendir DIR, "$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, $checkCollisionContents, $priority);
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}
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}
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sub checkCollision {
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my ($path1, $path2) = @_;
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if (! -e $path1 || ! -e $path2) {
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return 0;
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}
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my $stat1 = (stat($path1))[2];
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my $stat2 = (stat($path2))[2];
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if ($stat1 != $stat2) {
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warn "different permissions in `$path1' and `$path2': "
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. sprintf("%04o", $stat1 & 07777) . " <-> "
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. sprintf("%04o", $stat2 & 07777);
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return 0;
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}
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return compare($path1, $path2) == 0;
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}
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sub prependDangling {
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my $path = shift;
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return (-l $path && ! -e $path ? "dangling symlink " : "") . "`$path'";
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}
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sub findFiles {
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my ($relName, $target, $baseName, $ignoreCollisions, $checkCollisionContents, $priority) = @_;
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# The store path must not be a file
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if (-f $target && isStorePath $target) {
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die "The store path $target is a file and can't be merged into an environment using pkgs.buildEnv!";
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}
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# Urgh, hacky...
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return if
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$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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$baseName eq "log" ||
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! (hasPathsToLink($relName) || isInPathsToLink($relName));
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my ($oldTarget, $oldPriority) = @{$symlinks{$relName} // [undef, undef]};
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# If target doesn't exist, create it. If it already exists as a
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# symlink to a file (not a directory) in a lower-priority package,
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# overwrite it.
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if (!defined $oldTarget || ($priority < $oldPriority && ($oldTarget ne "" && ! -d $oldTarget))) {
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# If target is a dangling symlink, emit a warning.
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if (-l $target && ! -e $target) {
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my $link = readlink $target;
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warn "creating dangling symlink `$out$extraPrefix/$relName' -> `$target' -> `$link'\n";
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}
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$symlinks{$relName} = [$target, $priority];
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return;
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}
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# If target already exists and both targets resolves to the same path, skip
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if (
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defined $oldTarget && $oldTarget ne "" &&
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defined abs_path($target) && defined abs_path($oldTarget) &&
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abs_path($target) eq abs_path($oldTarget)
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) {
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# Prefer the target that is not a symlink, if any
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if (-l $oldTarget && ! -l $target) {
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$symlinks{$relName} = [$target, $priority];
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}
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return;
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}
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# If target already exists as a symlink to a file (not a
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# directory) in a higher-priority package, skip.
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if (defined $oldTarget && $priority > $oldPriority && $oldTarget ne "" && ! -d $oldTarget) {
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return;
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}
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# If target is supposed to be a directory but it isn't, die with an error message
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# instead of attempting to recurse into it, only to fail then.
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# This happens e.g. when pathsToLink contains a non-directory path.
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if ($oldTarget eq "" && ! -d $target) {
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die "not a directory: `$target'\n";
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}
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unless (-d $target && ($oldTarget eq "" || -d $oldTarget)) {
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# Prepend "dangling symlink" to paths if applicable.
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my $targetRef = prependDangling($target);
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my $oldTargetRef = prependDangling($oldTarget);
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if ($ignoreCollisions) {
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warn "collision between $targetRef and $oldTargetRef\n" if $ignoreCollisions == 1;
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return;
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} elsif ($checkCollisionContents && checkCollision($oldTarget, $target)) {
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return;
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} else {
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die "collision between $targetRef and $oldTargetRef\n";
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}
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}
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findFilesInDir($relName, $oldTarget, $ignoreCollisions, $checkCollisionContents, $oldPriority) unless $oldTarget eq "";
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findFilesInDir($relName, $target, $ignoreCollisions, $checkCollisionContents, $priority);
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$symlinks{$relName} = ["", $priority]; # denotes directory
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}
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my %done;
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my %postponed;
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sub addPkg {
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my ($pkgDir, $ignoreCollisions, $checkCollisionContents, $priority) = @_;
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return if (defined $done{$pkgDir});
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$done{$pkgDir} = 1;
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findFiles("", $pkgDir, "", $ignoreCollisions, $checkCollisionContents, $priority);
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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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# Read packages list.
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my $pkgs;
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if (exists $ENV{"pkgsPath"}) {
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open FILE, $ENV{"pkgsPath"};
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$pkgs = <FILE>;
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close FILE;
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} else {
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$pkgs = $ENV{"pkgs"}
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}
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# Symlink to the packages that have been installed explicitly by the
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# user.
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for my $pkg (@{decode_json $pkgs}) {
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for my $path (@{$pkg->{paths}}) {
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addPkg($path,
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$ENV{"ignoreCollisions"} eq "1",
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$ENV{"checkCollisionContents"} eq "1",
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$pkg->{priority})
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if -e $path;
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}
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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 wants 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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my $priorityCounter = 1000; # don't care about 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, $ENV{"checkCollisionContents"} eq "1", $priorityCounter++);
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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, $priority) = @{$symlinks{$relName}};
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my $abs = "$out" . "$extraPrefix" . "/$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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