From d133cd023e100e2668d4cc16c48c2db5ab350f16 Mon Sep 17 00:00:00 2001
From: Pierre-Yves Chibon <pingou@pingoured.fr>
Date: Jul 30 2014 15:39:22 +0000
Subject: Add the update_git_ticket to the internal API


This method forks a given project and update the JSON representation of
the specified issue. The file containing the JSON is named after the UID
of the issue stored in the database.
Upon additions or editions in the git, changes are pushed back to the
main repo

---

diff --git a/progit/lib.py b/progit/lib.py
index 1049c8f..ab20bad 100644
--- a/progit/lib.py
+++ b/progit/lib.py
@@ -11,6 +11,8 @@
 
 import json
 import os
+import shutil
+import tempfile
 
 import sqlalchemy
 from datetime import timedelta
@@ -637,3 +639,84 @@ def issue_to_json(issue):
     output['comments'] = comments
 
     return json.dumps(output)
+
+
+def update_git_ticket(issue, repo, ticketfolder):
+    """ Update the given issue in its git.
+
+    This method forks the provided repo, add/edit the issue whose file name
+    is defined by the uid field of the issue and if there are additions/
+    changes commit them and push them back to the original repo.
+
+    """
+
+    # Get the fork
+    repopath = os.path.join(ticketfolder, repo.path)
+    ticket_repo = pygit2.Repository(repopath)
+
+    # Clone the repo into a temp folder
+    newpath = tempfile.mkdtemp()
+    new_repo = pygit2.clone_repository(repopath, newpath)
+
+    file_path = os.path.join(newpath, issue.uid)
+
+    # Get the current index
+    index = new_repo.index
+
+    # Are we adding files
+    added = False
+    if not os.path.exists(file_path):
+        added = True
+
+    # Write down what changed
+    with open(file_path, 'w') as stream:
+        stream.write(issue_to_json(issue))
+
+    # Retrieve the list of files that changed
+    diff = new_repo.diff()
+    files = [patch.new_file_path for patch in diff]
+
+    # Add the changes to the index
+    if added:
+        index.add(issue.uid)
+    for filename in files:
+        index.add(filename)
+
+    # If not change, return
+    if not files or added:
+        shutil.rmtree(newpath)
+        return
+
+    # See if there is a parent to this commit
+    parent = None
+    try:
+        parent = new_repo.head.get_object().oid
+    except pygit2.GitError:
+        pass
+
+    parents = []
+    if parent:
+        parents.append(parent)
+
+    # Author/commiter will always be this one
+    author = pygit2.Signature(name='progit', email='progit')
+
+    # Actually commit
+    sha = new_repo.create_commit(
+        'refs/heads/master',
+        author,
+        author,
+        'Updated ticket %s: %s' % (issue.uid, issue.title),
+        new_repo.index.write_tree(),
+        parents)
+    index.write()
+
+    # Push to origin
+    ori_remote = new_repo.remotes[0]
+    master_ref = new_repo.lookup_reference('HEAD').resolve()
+    refname = '%s:%s' % (master_ref.name, master_ref.name)
+
+    ori_remote.push(refname)
+
+    # Remove the clone
+    shutil.rmtree(newpath)