[infra] Add functionality to check out a specific commit for a project (#3092)

* Starting the git python API

* repo manager working with tests

* Docker repo manager working, can update image with specific commit

* Working bisection

* Formatting and linting

* Working bisection

* Specific commit checkout

* Specific commit checkout

* Removed bisector and updated helper

* remove branch bug

* Max comments

* Added tests for infer main repo

* Oliver comments

* helper.py function names change

* Oliver comments pt. 2

* Olivers comments

* Formatting updates

* Removing DockerRepoManager class

* Removing DockerRepoManager class

* Changing from copying repo to docker image to mounting repo on docker image

* Jonathan comments

* Build image from commit tests

* Oliver comments pt.3

* Oliver comments pt.4

* Linting

* Max comments pt. 2

* change check commit exists

* Max comments pt. 3

* Regex updated

* Formatting updates

1 files changed, 78 insertions, 0 deletions

diff --git a/infra/repo_manager_test.py b/infra/repo_manager_test.py
new file mode 100644
index 000000000..b5e5b151a
--- /dev/null
+++ b/infra/repo_manager_test.py
@@ -0,0 +1,78 @@
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing perepo_managerissions and
+# limitations under the License.
+"""Test the functionality of the RepoManager class
+The will consist of the following functional tests
+  1. Cloning of directory in desired location
+  2. Checking out a specific commit
+  3. Can get a list of commits between two SHAs
+"""
+
+import os
+import unittest
+
+from RepoManager import RepoManager
+from RepoManager import RepoManagerError
+
+
+class TestRepoManager(unittest.TestCase):
+  """Class to test the functionality of the RepoManager class."""
+
+  curl_repo = 'https://github.com/curl/curl'
+
+  def test_clone_correctly(self):
+    """Tests the correct location of the git repo."""
+    repo_manager = RepoManager(self.curl_repo, 'tmp')
+    git_path = os.path.join(repo_manager.base_dir, repo_manager.repo_name,
+                            '.git')
+    self.assertTrue(os.path.isdir(git_path))
+    repo_manager.remove_repo()
+    with self.assertRaises(RepoManagerError):
+      repo_manager = RepoManager(' ', 'tmp')
+
+  def test_checkout_commit(self):
+    """Tests that the git checkout command works."""
+    repo_manager = RepoManager(self.curl_repo, 'tmp')
+    commit_to_test = '036ebac0134de3b72052a46f734e4ca81bb96055'
+    repo_manager.checkout_commit(commit_to_test)
+    self.assertEqual(commit_to_test, repo_manager.get_current_commit())
+    with self.assertRaises(ValueError):
+      repo_manager.checkout_commit(' ')
+    with self.assertRaises(RepoManagerError):
+      repo_manager.checkout_commit('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa')
+    repo_manager.remove_repo()
+
+  def test_get_commit_list(self):
+    """Tests an accurate commit list can be retrived from the repo manager."""
+    repo_manager = RepoManager(self.curl_repo, 'tmp')
+    old_commit = '7cf18b05e04bbb0f08c74d2567b0648f6c31a952'
+    new_commit = '113db127ee2b2f874dfcce406103ffe666e11953'
+    commit_list = [
+        '113db127ee2b2f874dfcce406103ffe666e11953',
+        '793e37767581aec7102d2ecafa34fc1316b1b31f',
+        '9a2cbf30b81a2b57149bb20e78e2e4cb5c2ff389',
+        '7cf18b05e04bbb0f08c74d2567b0648f6c31a952'
+    ]
+    result_list = repo_manager.get_commit_list(old_commit, new_commit)
+    self.assertListEqual(commit_list, result_list)
+    with self.assertRaises(RepoManagerError):
+      repo_manager.get_commit_list('asafd', new_commit)
+    with self.assertRaises(RepoManagerError):
+      repo_manager.get_commit_list(new_commit, 'asdfasdf')
+    with self.assertRaises(RepoManagerError):
+      # Testing commits out of order
+      result_list = repo_manager.get_commit_list(new_commit, old_commit)
+
+
+if __name__ == '__main__':
+  unittest.main()