recipe engine: add remote_run command

recipe_engine/remote_run.py

Index: recipe_engine/remote_run.py
diff --git a/recipe_engine/remote_run.py b/recipe_engine/remote_run.py
new file mode 100644
index 0000000000000000000000000000000000000000..c5deaf5f0471ad86fca2f7956e85207c365e83e6
--- /dev/null
+++ b/recipe_engine/remote_run.py
@@ -0,0 +1,50 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from __future__ import print_function
+
+import contextlib
+import logging
+import os
+import shutil
+import subprocess
+import sys
+import tempfile
+
+from recipe_engine import fetch
+from recipe_engine import package
+
+
+@contextlib.contextmanager
+def ensure_workdir(args):
+  workdir_tempdir = False
+  if not args.workdir:
+    workdir_tempdir = True
+    args.workdir = tempfile.mkdtemp(prefix='recipe_engine_remote_run_')
+    logging.info('Created temporary workdir %s', args.workdir)
+
+  try:
+    yield
+  finally:
+    if workdir_tempdir:
+      shutil.rmtree(args.workdir, ignore_errors=True)
+
+
+def main(args):
+  with ensure_workdir(args):
+    checkout_dir = os.path.join(args.workdir, 'checkout')
+    fetch.ensure_git_checkout(
+        args.repository, args.revision, checkout_dir, allow_fetch=True)
+    recipes_cfg = package.ProtoFile(
+        package.InfraRepoConfig().to_recipes_cfg(checkout_dir))
+    cmd = [
+        sys.executable,
+        os.path.join(
+            checkout_dir,
+            recipes_cfg.read().recipes_path,
+            'recipes.py'),
+        'run'
+    ] + args.run_args
+    logging.info('Running %r', cmd)
+    return subprocess.call(cmd)