[IMP] runbot: match prs with build errors automatically

Automatically link the pr with the build error if it contains anything
along the lines of `runbot.*error.*{id}`.
Among the changes:
 - Add a path for the build error act_window so that it include
   runbot-error
 - Fix the widget for `pr_body` in branch form view to use `text`
   instead of char as they are most likely multi line string.

runbot/models/branch.py

@@ -87,6 +87,28 @@ class Branch(models.Model):
                 reference_name = f'{forced_version.name}---{reference_name}'
             branch.reference_name = reference_name
 
+    def _match_errors_from_body(self):
+        """
+        Checks the pr_body for any reference to runbot errors and links the branch
+        to those errors if they exist.
+        """
+        self.ensure_one()
+        if not self.pr_body:
+            return
+        pr_body_regex = r'^.*runbot.*error[^\d]*(\d+)[ \S]*\r?$'
+        error_ids = re.findall(
+            pr_body_regex,
+            self.pr_body,
+            re.IGNORECASE | re.MULTILINE
+        )
+        # We need to check if they exist and search does nothing if error_ids is empty
+        errors = self.env['runbot.build.error'].sudo().search([
+            ('id', 'in', error_ids), ('fixing_pr_id', '=', False),
+        ])
+        errors.fixing_pr_id = self
+        for error in errors:
+            error.message_post(body='Fixing pr automatically set through PR message')
+
     def _update_branch_infos(self, pull_info=None):
         """compute branch_url, pull_head_name and target_branch_name based on name"""
         name_to_remote = {}
@@ -131,6 +153,7 @@ class Branch(models.Model):
                                 owner, repo_name = pull_head_repo_name.split('/')
                                 name_to_remote[pull_head_repo_name] = self.env['runbot.remote'].search([('owner', '=', owner), ('repo_name', '=', repo_name)], limit=1)
                             branch.pull_head_remote_id = name_to_remote[pull_head_repo_name]
+                        branch._match_errors_from_body()
                     except (TypeError, AttributeError):
                         _logger.exception('Error for pr %s using pull_info %s', branch.name, pi)
                         raise

runbot/tests/test_branch.py

@@ -65,6 +65,44 @@ class TestBranch(RunbotCase):
             self.Branch.search([('dname', '=', branch.dname)]),
         )
 
+    def test_automatic_match_with_error(self):
+        self.env['runbot.build.error'].search([]).active = False
+        errors = self.env['runbot.build.error'].create([{} for _ in range(5)])
+        branch = self.Branch.create({
+            'name': '18.0-test',
+            'remote_id': self.remote_server.id,
+            'is_pr': True,
+        })
+        # Does not crash without pr_body or nothing on pr_body
+        branch._match_errors_from_body()
+        branch.pr_body = ''
+        branch._match_errors_from_body()
+        # Does not link unknown errors
+        branch.pr_body = f'This is an error {errors[0].id}'
+        branch._match_errors_from_body()
+        self.assertFalse(errors.fixing_pr_id)
+        # Test multiple formats
+        branch.pr_body = f"""
+        Runbot error {errors[0].id}
+        runbot error {errors[1].id}
+        runbot-error-{errors[2].id}
+        https://domain.com/odoo/runbot.build.error/{errors[3].id}
+        https://domain.com/odoo/runbot-error/{errors[4].id}/
+        """
+        branch._match_errors_from_body()
+        self.assertTrue(all(e.fixing_pr_id == branch for e in errors))
+        # Test that it does not reassign
+        errors.fixing_pr_id = False
+        branch.pr_body = f'Runbot ERror {errors[0].id}'
+        other_branch = self.Branch.create({
+            'name': 'other-branch',
+            'remote_id': self.remote_server.id,
+            'is_pr': True,
+        })
+        errors[0].fixing_pr_id = other_branch
+        branch._match_errors_from_body()
+        self.assertEqual(errors[0].fixing_pr_id, other_branch)
+
 class TestBranchRelations(RunbotCase):
 
     def setUp(self):

runbot/views/branch_views.xml

@@ -21,7 +21,7 @@
                 <field name="head"/>
                 <field name="alive"/>
                 <field name="pr_title"/>
-                <field name="pr_body"/>
+                <field name="pr_body" widget="text"/>
               </group>
             </sheet>
           </form>

runbot/views/build_error_views.xml

@@ -468,6 +468,7 @@
       <field name="res_model">runbot.build.error</field>
       <field name="view_mode">list,form</field>
       <field name="context">{'search_default_not_fixed_errors': True, 'active_test': False}</field>
+      <field name="path">runbot-error</field>
     </record>
 
     <record id="open_view_build_error_content_tree" model="ir.actions.act_window">