recipe engine: add remote_run command

recipe_engine/unittests/fetch_test.py

Index: recipe_engine/unittests/fetch_test.py
diff --git a/recipe_engine/unittests/fetch_test.py b/recipe_engine/unittests/fetch_test.py
new file mode 100755
index 0000000000000000000000000000000000000000..88dbe4f7fe7142a3f92066f56047b6551cce2362
--- /dev/null
+++ b/recipe_engine/unittests/fetch_test.py
@@ -0,0 +1,100 @@
+#!/usr/bin/env python
+# 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.
+
+import os
+import sys
+import unittest
+
+BASE_DIR = os.path.dirname(os.path.dirname(os.path.dirname(
+    os.path.abspath(__file__))))
+THIRD_PARTY = os.path.join(BASE_DIR, 'recipe_engine', 'third_party')
+sys.path.insert(0, os.path.join(THIRD_PARTY, 'mock-1.0.1'))
+sys.path.insert(0, BASE_DIR)
+sys.path.insert(0, THIRD_PARTY)
+
+import mock
+import subprocess42
+
+from recipe_engine import fetch
+
+
+class TestGit(unittest.TestCase):
+  @mock.patch('recipe_engine.fetch._run_git')
+  def test_fresh_clone(self, run_git):
+    fetch.fetch_from_git('repo', 'revision', 'dir', allow_fetch=True)
+    run_git.assert_has_calls([
+      mock.call(None, 'clone', '-q', 'repo', 'dir'),
+      mock.call('dir', 'rev-parse', '-q', '--verify', 'revision^{commit}'),
+      mock.call('dir', 'reset', '-q', '--hard', 'revision'),
+    ])
+
+  @mock.patch('os.path.isdir')
+  @mock.patch('recipe_engine.fetch._run_git')
+  def test_existing_checkout(self, run_git, isdir):
+    isdir.return_value = True
+    fetch.fetch_from_git('repo', 'revision', 'dir', allow_fetch=True)
+    isdir.assert_has_calls([
+      mock.call('dir'),
+      mock.call('dir/.git'),
+    ])
+    run_git.assert_has_calls([
+      mock.call('dir', 'rev-parse', '-q', '--verify', 'revision^{commit}'),
+      mock.call('dir', 'reset', '-q', '--hard', 'revision'),
+    ])
+
+  @mock.patch('recipe_engine.fetch._run_git')
+  def test_clone_not_allowed(self, run_git):
+    with self.assertRaises(fetch.FetchNotAllowedError):
+      fetch.fetch_from_git('repo', 'revision', 'dir', allow_fetch=False)
+
+  @mock.patch('os.path.isdir')
+  @mock.patch('recipe_engine.fetch._run_git')
+  def test_unclean_filesystem(self, run_git, isdir):
+    isdir.side_effect = [True, False]
+    with self.assertRaises(fetch.UncleanFilesystemError):
+      fetch.fetch_from_git('repo', 'revision', 'dir', allow_fetch=False)
+    isdir.assert_has_calls([
+      mock.call('dir'),
+      mock.call('dir/.git'),
+    ])
+
+  @mock.patch('os.path.isdir')
+  @mock.patch('recipe_engine.fetch._run_git')
+  def test_rev_parse_fail(self, run_git, isdir):
+    run_git.side_effect = [
+      subprocess42.CalledProcessError(1, ['fakecmd']),
+      None,
+      None,
+    ]
+    isdir.return_value = True
+    fetch.fetch_from_git('repo', 'revision', 'dir', allow_fetch=True)
+    isdir.assert_has_calls([
+      mock.call('dir'),
+      mock.call('dir/.git'),
+    ])
+    run_git.assert_has_calls([
+      mock.call('dir', 'rev-parse', '-q', '--verify', 'revision^{commit}'),
+      mock.call('dir', 'fetch'),
+      mock.call('dir', 'reset', '-q', '--hard', 'revision'),
+    ])
+
+  @mock.patch('os.path.isdir')
+  @mock.patch('recipe_engine.fetch._run_git')
+  def test_rev_parse_fetch_not_allowed(self, run_git, isdir):
+    run_git.side_effect = [subprocess42.CalledProcessError(1, ['fakecmd'])]
+    isdir.return_value = True
+    with self.assertRaises(fetch.FetchNotAllowedError):
+      fetch.fetch_from_git('repo', 'revision', 'dir', allow_fetch=False)
+    isdir.assert_has_calls([
+      mock.call('dir'),
+      mock.call('dir/.git'),
+    ])
+    run_git.assert_has_calls([
+      mock.call('dir', 'rev-parse', '-q', '--verify', 'revision^{commit}'),
+    ])
+
+
+if __name__ == '__main__':
+  unittest.main()