1 files changed, 53 insertions, 0 deletions
diff --git a/python/mozbuild/mozbuild/gen_test_backend.py b/python/mozbuild/mozbuild/gen_test_backend.py
new file mode 100644
index 0000000000..ce499fe90a
--- /dev/null
+++ b/python/mozbuild/mozbuild/gen_test_backend.py
@@ -0,0 +1,53 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import sys
+
+import mozpack.path as mozpath
+
+from mozbuild.backend.test_manifest import TestManifestBackend
+from mozbuild.base import BuildEnvironmentNotFoundException, MozbuildObject
+from mozbuild.frontend.emitter import TreeMetadataEmitter
+from mozbuild.frontend.reader import BuildReader, EmptyConfig
+
+
+def gen_test_backend():
+    build_obj = MozbuildObject.from_environment()
+    try:
+        config = build_obj.config_environment
+    except BuildEnvironmentNotFoundException:
+        # Create a stub config.status file, since the TestManifest backend needs
+        # to be re-created if configure runs. If the file doesn't exist,
+        # mozbuild continually thinks the TestManifest backend is out of date
+        # and tries to regenerate it.
+
+        if not os.path.isdir(build_obj.topobjdir):
+            os.makedirs(build_obj.topobjdir)
+
+        config_status = mozpath.join(build_obj.topobjdir, "config.status")
+        open(config_status, "w").close()
+
+        print("No build detected, test metadata may be incomplete.")
+
+        # If 'JS_STANDALONE' is set, tests that don't require an objdir won't
+        # be picked up due to bug 1345209.
+        substs = EmptyConfig.default_substs
+        if "JS_STANDALONE" in substs:
+            del substs["JS_STANDALONE"]
+
+        config = EmptyConfig(build_obj.topsrcdir, substs)
+        config.topobjdir = build_obj.topobjdir
+
+    reader = BuildReader(config)
+    emitter = TreeMetadataEmitter(config)
+    backend = TestManifestBackend(config)
+
+    context = reader.read_topsrcdir()
+    data = emitter.emit(context, emitfn=emitter._process_test_manifests)
+    backend.consume(data)
+
+
+if __name__ == "__main__":
+    sys.exit(gen_test_backend())