Add provisional Jenkins job

scripts/build/TestImpactAnalysis/git_utils.py

@@ -0,0 +1,42 @@
+#
+# All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
+# its licensors.
+#
+# For complete copyright and license terms please see the LICENSE at the root of this
+# distribution (the "License"). All use of this software is governed by the License,
+# or, if provided, by the license below or the license accompanying this file. Do not
+# remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#
+
+import os
+import subprocess
+import git
+
+# Returns True if the dst commit descends from the src commit, otherwise False
+def is_descendent(src_commit_hash, dst_commit_hash):
+    if src_commit_hash is None or dst_commit_hash is None:
+        return False
+    result = subprocess.run(["git", "merge-base", "--is-ancestor", src_commit_hash, dst_commit_hash])
+    return result.returncode == 0
+
+# Attempts to create a diff from the src and dst commits and write to the specified output file
+def create_diff_file(src_commit_hash, dst_commit_hash, output_path):
+    if os.path.isfile(output_path):
+        os.remove(output_path)
+    os.makedirs(os.path.dirname(output_path), exist_ok=True)
+    # git diff will only write to the output file if both commit hashes are valid
+    subprocess.run(["git", "diff", "--name-status", f"--output={output_path}", src_commit_hash, dst_commit_hash])
+    if not os.path.isfile(output_path):
+        raise FileNotFoundError(f"Source commit '{src_commit_hash}' and/or destination commit '{dst_commit_hash}' are invalid")
+
+# Basic representation of a repository
+class Repo:
+    def __init__(self, repo_path):
+        self.__repo = git.Repo(repo_path)
+
+    # Returns the current branch
+    @property
+    def current_branch(self):
+        branch = self.__repo.active_branch
+        return branch.name