[IMP] *: convert fw=no to a genuine forward-porting policy

After seeing it be used, I foresee confusion around the current
behaviour (where it sets the limit), as one would expect the `fw=`
flags to affect one another when it looks like that would make sense
e.g. no/default/skipci/skipmerge all specify how to forward port, so
`fw=default` not doing anything after you've said `fw=no` (possibly by
mistake) would be fucking weird.

Also since the author can set limits, allow them to reset the fw
policy to default (keep skipci for reviewers), and for @d-fence add a
`fw=disabled` alias.

Fixes #902

forwardport/models/project.py

@@ -550,6 +550,9 @@ class Stagings(models.Model):
         if vals.get('active') is False and self.state == 'success':
             # check all batches to see if they should be forward ported
             for b in self.with_context(active_test=False).batch_ids:
+                if b.fw_policy == 'no':
+                    continue
+
                 # if all PRs of a batch have parents they're part of an FP
                 # sequence and thus handled separately, otherwise they're
                 # considered regular merges

forwardport/tests/test_limit.py

@@ -72,8 +72,8 @@ def test_ignore(env, config, make_repo, users):
         (users['reviewer'], "hansen ignore"),
         (users['reviewer'], "hansen r+ fw=no"),
         (users['user'], "'ignore' is deprecated, use 'fw=no' to disable forward porting."),
-        (users['user'], "Forward-port disabled."),
-        (users['user'], "Forward-port disabled."),
+        (users['user'], "Forward-port disabled (via limit)."),
+        (users['user'], "Disabled forward-porting."),
     ]
 
 @pytest.mark.expect_log_errors(reason="one of the limit-setting does not provide a branch name")

runbot_merge/models/batch.py

@@ -68,9 +68,10 @@ class Batch(models.Model):
     active = fields.Boolean(compute='_compute_active', store=True, help="closed batches (batches containing only closed PRs)")
 
     fw_policy = fields.Selection([
+        ('no', "Do not port forward"),
         ('default', "Default"),
         ('skipci', "Skip CI"),
-    ], required=True, default="default", string="Forward Port Policy")
+    ], required=True, default="default", string="Forward Port Policy", tracking=True)
 
     merge_date = fields.Datetime(tracking=True)
     # having skipchecks skip both validation *and approval* makes sense because
@@ -89,7 +90,7 @@ class Batch(models.Model):
         ('default', "Default"),
         ('priority', "Priority"),
         ('alone', "Alone"),
-    ], default='default', group_operator=None, required=True,
+    ], default='default', group_operator=None, required=True, tracking=True,
         column_type=enum(_name, 'priority'),
     )
 

runbot_merge/models/commands.py

@@ -363,6 +363,8 @@ class Parser:
         self.assert_next('=')
         f = next(self.it, "")
         try:
+            if f in ('disable', 'disabled'):
+                return FW.NO
             return FW[f.upper()]
         except KeyError:
             raise CommandError(f"unknown fw configuration {f or None!r}") from None

runbot_merge/models/pull_requests.py

@@ -873,35 +873,21 @@ For your own safety I've ignored *everything in your entire comment*.
                 case commands.Close() if source_author:
                     feedback(close=True)
                 case commands.FW():
-                    if command == commands.FW.NO:
-                        if is_author:
-                            for p in self.batch_id.prs:
-                                ping, m = p._maybe_update_limit(self.target.name)
+                    match command:
+                        case commands.FW.NO if is_author or source_author:
+                            message = "Disabled forward-porting."
+                        case commands.FW.DEFAULT if is_author or source_author:
+                            message = "Waiting for CI to create followup forward-ports."
+                        case commands.FW.SKIPCI if is_reviewer or source_reviewer:
+                            message = "Not waiting for CI to create followup forward-ports."
+                        case commands.FW.SKIPMERGE if is_reviewer or source_reviewer:
+                            message = "Not waiting for merge to create followup forward-ports."
+                        case _:
+                            msg = f"you don't have the right to {command}."
 
-                                if ping and p == self:
-                                    msg = m
-                                else:
-                                    if ping:
-                                        m = f"@{login} {m}"
-                                    self.env['runbot_merge.pull_requests.feedback'].create({
-                                        'repository': p.repository.id,
-                                        'pull_request': p.number,
-                                        'message': m,
-                                    })
-                        else:
-                            msg = "you can't set a forward-port limit."
-                    elif source_reviewer or is_reviewer:
+                    if not msg:
                         (self.source_id or self).batch_id.fw_policy = command.name.lower()
-                        match command:
-                            case commands.FW.DEFAULT:
-                                message = "Waiting for CI to create followup forward-ports."
-                            case commands.FW.SKIPCI:
-                                message = "Not waiting for CI to create followup forward-ports."
-                            case commands.FW.SKIPMERGE:
-                                message = "Not waiting for merge to create followup forward-ports."
                         feedback(message=message)
-                    else:
-                        msg = "you can't configure forward-port CI."
                 case commands.Limit(branch) if is_author:
                     if branch is None:
                         feedback(message="'ignore' is deprecated, use 'fw=no' to disable forward porting.")
@@ -957,7 +943,7 @@ For your own safety I've ignored *everything in your entire comment*.
         if not self.source_id and self.state != 'merged':
             self.limit_id = limit_id
             if branch_key(limit_id) <= branch_key(self.target):
-                return False, "Forward-port disabled."
+                return False, "Forward-port disabled (via limit)."
             else:
                 return False, f"Forward-porting to {limit_id.name!r}."