[IMP] runbot: handle PR re-targeting

When a PR branch target is changed on Github, the change is not applied
in the runbot DB.

With this commit, the Github hook payload is taken into account to
detect such a change and the branch infos are recomputed accordingly.

Also, a button is now available on the branch form in order to manually
recompute those changes.

runbot/controllers/hook.py

@@ -32,6 +32,11 @@ class RunbotHook(http.Controller):
         # force update of dependencies to in case a hook is lost
         if not payload or event == 'push' or (event == 'pull_request' and payload.get('action') in ('synchronize', 'opened', 'reopened')):
             (repo | repo.dependency_ids).set_hook_time(time.time())
+        elif event == 'pull_request' and payload and payload.get('action', '') == 'edited' and 'base' in payload.get('changes'):
+            # handle PR that have been re-targeted
+            pr_number = payload.get('pull_request', {}).get('number', '')
+            branch = request.env['runbot.branch'].sudo().search([('repo_id', '=', repo.id), ('name', '=', 'refs/pull/%s' % pr_number)])
+            branch._get_branch_infos(payload.get('pull_request', {}))
         else:
             _logger.debug('Ignoring unsupported hook %s %s', event, payload.get('action', ''))
         return ""

runbot/models/branch.py

@@ -102,12 +102,12 @@ class runbot_branch(models.Model):
             branch.branch_config_id = branch.config_id
 
     @api.depends('name')
-    def _get_branch_infos(self):
+    def _get_branch_infos(self, pull_info=None):
         """compute branch_name, branch_url, pull_head_name and target_branch_name based on name"""
         for branch in self:
             if branch.name:
                 branch.branch_name = branch.name.split('/')[-1]
-                pi = branch._get_pull_info()
+                pi = pull_info or branch._get_pull_info()
                 if pi:
                     branch.target_branch_name = pi['base']['ref']
                     if not _re_patch.match(pi['head']['label']):
@@ -116,6 +116,10 @@ class runbot_branch(models.Model):
             else:
                 branch.branch_name = ''
 
+    def recompute_infos(self):
+        """ public method to recompute infos on demand """
+        self._get_branch_infos()
+
     @api.depends('branch_name')
     def _get_branch_url(self):
         """compute the branch url based on branch_name"""

runbot/views/branch_views.xml

@@ -6,6 +6,7 @@
         <field name="arch" type="xml">
           <form>
             <header>
+              <button name="recompute_infos" string="Recompute Infos" type="object" class="oe_highlight"/>
             </header>
             <sheet>
               <div class="oe_button_box" name="button_box">