Handle the case when opening a reverted PR with deleted head branch (#114423)
When reopening a reverted PR, `422: Unprocessable Entity` is returned when the head branch has been deleted, for example https://github.com/pytorch/pytorch/pull/112889#issuecomment-1823216686
```
{
"message": "Validation Failed",
"errors": [
{
"resource": "PullRequest",
"code": "custom",
"field": "state",
"message": "state cannot be changed. The commsplit branch has been deleted."
}
],
"documentation_url": "https://docs.github.com/rest/pulls/pulls#update-a-pull-request"
}
```
The revert still happens though, only reopening PR fails, which is ok to ignore in this case I think instead of going the complicated route of trying to restore the deleted branch by merge bot.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/114423
Approved by: https://github.com/malfet, https://github.com/kit1980
diff --git a/.github/scripts/github_utils.py b/.github/scripts/github_utils.py
index ff98546..05b95fc 100644
--- a/.github/scripts/github_utils.py
+++ b/.github/scripts/github_utils.py
@@ -178,4 +178,14 @@
def gh_update_pr_state(org: str, repo: str, pr_num: int, state: str = "open") -> None:
url = f"{GITHUB_API_URL}/repos/{org}/{repo}/pulls/{pr_num}"
- gh_fetch_url(url, method="PATCH", data={"state": state})
+ try:
+ gh_fetch_url(url, method="PATCH", data={"state": state})
+ except HTTPError as err:
+ # When trying to open the pull request, error 422 means that the branch
+ # has been deleted and the API couldn't re-open it
+ if err.code == 422 and state == "open":
+ warnings.warn(
+ f"Failed to open {pr_num} because its head branch has been deleted: {err}"
+ )
+ else:
+ raise
