Swift: add qltest.sh tests

swift/create_extractor_pack.py

@@ -0,0 +1,16 @@
+import os
+import pathlib
+import shutil
+import sys
+from swift._create_extractor_pack_install_script import main
+
+try:
+    workspace_dir = pathlib.Path(os.environ['BUILD_WORKSPACE_DIRECTORY'])
+except KeyError:
+    print("this should be run with bazel run", file=sys.stderr)
+    sys.exit(1)
+
+dest_dir = workspace_dir / 'swift' / 'extractor-pack'
+shutil.rmtree(dest_dir, ignore_errors=True)
+os.environ['DESTDIR'] = str(dest_dir)
+main(sys.argv)