cloning repo works

scripts/phab2github/.gitignore

@@ -0,0 +1 @@
+/tmp

scripts/phab2github/README.md

@@ -26,7 +26,7 @@ LLVM community.
 # Work items
 
 This is the list (and order) of the work items for this idea.
-We will start with this on a fork of the LLVM repository.
+We will start with this on a fork of the LLVM repository running on my machine as cron job.
 Cancel the effort if some thinks would not work or the community objects.
 
 * [ ] For each Revision create a branch. Create a PR from that.
@@ -36,6 +36,7 @@ Cancel the effort if some thinks would not work or the community objects.
 * [ ] Also sync Revisions that do not trigger Harbormaster at the moment and provide feedback as 
 well.
 * [ ] Clean up old branches and PRs. 
+* [ ] Move service to the cloud, trigger it with every change on Phabricator.
 * [ ] Add more build machines to buildkite and move beta testers to new infrastructure.
 * [ ] Move all pre-merge tests to new infrastructure.
 

scripts/phab2github/phab2github.py

@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+# Copyright 2020 Google LLC
+#
+# Licensed under the the Apache License v2.0 with LLVM Exceptions (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://llvm.org/LICENSE.txt
+#
+# 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 permissions and
+# limitations under the License.
+
+import os
+from typing import Optional
+import git
+import logging
+
+# TODO: move to config file
+LLVM_GITHUB_URL = 'ssh://git@github.com/llvm/llvm-project'
+_LOGGER = logging.getLogger()
+
+
+class Phab2Github:
+
+    def __init__(self, workdir: str):
+        self.workdir = workdir
+        self.llvm_dir = os.path.join(self.workdir, 'llvm-project')
+        self.repo = None  # type: Optional[git.Repo]
+
+    def sync(self):
+        _LOGGER.info('Starting sync...')
+        self._refresh_master()
+        revisions = self._get_revisions()
+
+    def _refresh_master(self):
+        if not os.path.exists(self.workdir):
+            os.mkdir(self.workdir)
+        if os.path.exists(self.llvm_dir):
+            # TODO: in case of errors: delete and clone
+            _LOGGER.info('pulling origin...')
+            self.repo = git.Repo(self.llvm_dir)
+            self.repo.remotes.origin.pull()
+        else:
+            _LOGGER.info('cloning repository...')
+            git.Repo.clone_from(LLVM_GITHUB_URL, self.llvm_dir)
+        _LOGGER.info('refresh of master branch completed')
+
+
+if __name__ == '__main__':
+    rootdir = os.path.dirname(os.path.abspath(__file__))
+    tmpdir = os.path.join(rootdir, 'tmp')
+    p2g = Phab2Github(tmpdir)
+    p2g.sync()

scripts/phab2github/requirements.txt

@@ -0,0 +1,3 @@
+phabricator==0.7.0
+gitpython==3.0.6
+retrying==1.3.3