Only comment about new commits if the PR is still open.

bedevere/stage.py

@@ -147,14 +147,16 @@ async def new_commit_pushed(event, gh, *arg, **kwargs):
         # get the latest commit hash
         commit_hash = commits[-1]["id"]
         pr = await util.get_pr_for_commit(gh, commit_hash)
-        for label in util.labels(pr):
-            if label == "awaiting merge":
-                issue = await util.issue_for_PR(gh, pr)
-                greeting = "There's a new commit after the PR has been approved."
-                await request_core_review(
-                    gh, issue, blocker=Blocker.core_review, greeting=greeting
-                )
-                break
+        if pr["state"] != "closed":
+            # only process the event if PR is still open
+            for label in util.labels(pr):
+                if label == "awaiting merge":
+                    issue = await util.issue_for_PR(gh, pr)
+                    greeting = "There's a new commit after the PR has been approved."
+                    await request_core_review(
+                        gh, issue, blocker=Blocker.core_review, greeting=greeting
+                    )
+                    break
 
 
 async def core_dev_reviewers(gh, pull_request_url):

tests/test_stage.py

@@ -1123,6 +1123,7 @@ async def test_new_commit_pushed_to_approved_pr(issue_url_key):
                     ],
                     # the key could be 'url' or 'issue_url'
                     issue_url_key: "/repos/python/cpython/issues/5547",
+                    "state": "open",
                 }
             ],
         },
@@ -1193,6 +1194,7 @@ async def test_new_commit_pushed_to_not_approved_pr(issue_url_key):
                     ],
                     #
                     issue_url_key: "/repos/python/cpython/issues/5547",
+                    "state": "open",
                 }
             ],
         },
@@ -1214,3 +1216,39 @@ async def test_pushed_without_commits():
 
     # no posts
     assert len(gh.post_) == 0
+
+
+@pytest.mark.parametrize("issue_url_key", ["url", "issue_url"])
+async def test_new_commit_pushed_to_closed_pr(issue_url_key):
+    # There is new commit on approved PR
+    sha = "f2393593c99dd2d3ab8bfab6fcc5ddee540518a9"
+    data = {"commits": [{"id": sha}]}
+    event = sansio.Event(data, event="push", delivery_id="12345")
+    items = {
+        f"https://api.github.com/search/issues?q=type:pr+repo:python/cpython+sha:{sha}": {
+            "total_count": 1,
+            "items": [
+                {
+                    "number": 5547,
+                    "title": "[3.6] bpo-32720: Fixed the replacement field grammar documentation. (GH-5544)",
+                    "body": "\n\n`arg_name` and `element_index` are defined as `digit`+ instead of `integer`.\n(cherry picked from commit 7a561afd2c79f63a6008843b83733911d07f0119)\n\nCo-authored-by: Mariatta <[email protected]>",
+                    "labels": [
+                        {
+                            "name": "CLA signed",
+                        },
+                        {
+                            "name": "awaiting review",
+                        },
+                    ],
+                    #
+                    issue_url_key: "/repos/python/cpython/issues/5547",
+                    "state": "closed",
+                }
+            ],
+        },
+    }
+    gh = FakeGH(getitem=items)
+    await awaiting.router.dispatch(event, gh)
+
+    # no posts
+    assert len(gh.post_) == 0