autoPatchelfHook: Allow to prevent automatic run

If you want to only run autoPatchelf on a specific path and leave
everything else alone, we now have a $dontAutoPatchelf environment
variable, which causes the postFixup hook to not run at all.

The name "dontAutoPatchelf" probably is a bit weird in conjunction with
putting "autoPatchelfHook" in nativeBuildInputs, but unless someone
comes up with a better name I keep it that way because it's consistent
with all the other dontStrip, dontPatchShebangs, dontPatchELF and
whatnot.

A specific example where this is needed is when building the Android SDK
emulator, which contains a few ARM binaries in subdirectories that
should not be patched. If we were to run autoPatchelf on all outputs
unconditionally we'd run into errors because some ARM libraries couldn't
be found.

Signed-off-by: aszlig <aszlig@nix.build>

1 files changed, 8 insertions, 3 deletions

diff --git a/pkgs/build-support/setup-hooks/auto-patchelf.sh b/pkgs/build-support/setup-hooks/auto-patchelf.sh
index 59e9a933211f..62348d71ed05 100644
--- a/pkgs/build-support/setup-hooks/auto-patchelf.sh
+++ b/pkgs/build-support/setup-hooks/auto-patchelf.sh
@@ -180,6 +180,11 @@ autoPatchelf() {
 # So what we do here is basically run in postFixup and emulate the same
 # behaviour as fixupOutputHooks because the setup hook for patchelf is run in
 # fixupOutput and the postFixup hook runs later.
-postFixupHooks+=(
-    'autoPatchelf $(for output in $outputs; do echo "${!output}"; done)'
-)
+postFixupHooks+=('
+    if [ -z "$dontAutoPatchelf" ]; then
+        autoPatchelf $(for output in $outputs; do
+            [ -e "${!output}" ] || continue
+            echo "${!output}"
+        done)
+    fi
+')