pkgs/build-game: Try to evade tarbombs

A lot of games (especially Unity games) come as a tarbomb, so in order
to avoid having those files all over the place we now create an
additional directory before unpack and set the sourceRoot to that if
it's a tarbomb and if that's not the case set it to the single file
within that directory.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

1 files changed, 21 insertions, 1 deletions

diff --git a/pkgs/games/build-support/build-game.nix b/pkgs/games/build-support/build-game.nix
index 46ed83df..5117b330 100644
--- a/pkgs/games/build-support/build-game.nix
+++ b/pkgs/games/build-support/build-game.nix
@@ -4,6 +4,8 @@ assert withPulseAudio -> libpulseaudio != null;
 
 { buildInputs ? []
 , nativeBuildInputs ? []
+, preUnpack ? ""
+, setSourceRoot ? ""
 , installCheckPhase ? ""
 , runtimeDependencies ? []
 , ...
@@ -16,6 +18,23 @@ stdenv.mkDerivation ({
     file ./setup-hooks/auto-patchelf.sh
   ] ++ nativeBuildInputs;
 
+  preUnpack = preUnpack + ''
+    mkdir "$name"
+    pushd "$name" &> /dev/null
+  '';
+
+  # Try to evade tarbombs
+  setSourceRoot = ''
+    popd &> /dev/null
+  '' + lib.optionalString (setSourceRoot == "") ''
+    unpackedFiles="$(find "$name" -mindepth 1 -maxdepth 1 -print)"
+    if [ $(echo "$unpackedFiles" | wc -l) -gt 1 ]; then
+      sourceRoot="$name"
+    else
+      sourceRoot="$name/''${unpackedFiles##*/}"
+    fi
+  '';
+
   runtimeDependencies = let
     deps = lib.optional withPulseAudio libpulseaudio ++ runtimeDependencies;
   in map (dep: dep.lib or dep) deps;
@@ -45,5 +64,6 @@ stdenv.mkDerivation ({
   dontStrip = true;
   dontPatchELF = true;
 } // removeAttrs attrs [
-  "buildInputs" "nativeBuildInputs" "installCheckPhase" "runtimeDependencies"
+  "buildInputs" "nativeBuildInputs" "preUnpack" "setSourceRoot"
+  "installCheckPhase" "runtimeDependencies"
 ])