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buildEnv: Check the content of colliding paths.
Originally wanted to include ignoreCollisions in cups-progs, but I think it's better if we use ignoreCollisions only if there are _real_ collisions between files with different contents. Of course, we also check whether the file permissions match, so you get a collision if contents are the same but the permissions are different. Signed-off-by: aszlig <aszlig@redmoonstudios.org>
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@ -5,6 +5,7 @@ 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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@ -38,7 +39,7 @@ for my $p (@pathsToLink) {
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sub findFiles;
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sub findFilesInDir {
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my ($relName, $target, $ignoreCollisions, $priority) = @_;
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my ($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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@ -46,12 +47,28 @@ sub findFilesInDir {
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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, $priority);
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findFiles("$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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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, $path2) == 0;
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}
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sub findFiles {
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my ($relName, $target, $baseName, $ignoreCollisions, $priority) = @_;
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my ($relName, $target, $baseName, $ignoreCollisions, $checkCollisionContents, $priority) = @_;
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# Urgh, hacky...
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return if
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@ -79,7 +96,9 @@ sub findFiles {
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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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if ($checkCollisionContents && checkCollision($oldTarget, $target)) {
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return;
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} elsif ($ignoreCollisions) {
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warn "collision between `$target' and `$oldTarget'\n" if $ignoreCollisions == 1;
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return;
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} else {
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@ -87,8 +106,8 @@ sub findFiles {
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}
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}
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findFilesInDir($relName, $oldTarget, $ignoreCollisions, $oldPriority) unless $oldTarget eq "";
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findFilesInDir($relName, $target, $ignoreCollisions, $priority);
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findFilesInDir($relName, $oldTarget, $ignoreCollisions, $checkCollisionContents, $oldPriority) unless $oldTarget eq "";
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findFilesInDir($relName, $target, $ignoreCollisions, $checkCollisionContents, $priority);
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$symlinks{$relName} = ["", $priority]; # denotes directory
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}
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@ -98,12 +117,12 @@ my %done;
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my %postponed;
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sub addPkg {
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my ($pkgDir, $ignoreCollisions, $priority) = @_;
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my ($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, $priority);
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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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@ -132,7 +151,11 @@ if (exists $ENV{"pkgsPath"}) {
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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, $ENV{"ignoreCollisions"} eq "1", $pkg->{priority}) if -e $path;
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addPkg($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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@ -16,6 +16,10 @@
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, # Whether to ignore collisions or abort.
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ignoreCollisions ? false
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, # If there is a collision, check whether the contents and permissions match
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# and only if not, throw a collision error.
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checkCollisionContents ? true
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, # The paths (relative to each element of `paths') that we want to
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# symlink (e.g., ["/bin"]). Any file not inside any of the
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# directories in the list is not symlinked.
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@ -39,7 +43,9 @@
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}:
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runCommand name
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rec { inherit manifest ignoreCollisions passthru meta pathsToLink extraPrefix postBuild buildInputs;
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rec {
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inherit manifest ignoreCollisions checkCollisionContents passthru
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meta pathsToLink extraPrefix postBuild buildInputs;
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pkgs = builtins.toJSON (map (drv: {
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paths =
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[ drv ]
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