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notes: re-sign a reviewed PR from its reviewed head; record the squash path - #194
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…h path The routine re-signed with `git rebase --exec ... upstream/main`, which replays every commit after upstream's tip. On a PR branch that started from an older main that is itself a rebase: tried on PR 62's stack, it rewrote all five commits, the two Joshua had reviewed included. A new section re-signs only the commits added since the reviewed head (`git rebase --exec ... <reviewed-head>`) and pushes them as a fast-forward; tried on the same stack, it rewrote the three new commits only and left the tree unchanged. A second section records the squash-merge path #192 took: GitHub signs the squash commit, but its message defaults to the fork PR's description and lands on upstream main unchanged, and the signature is GitHub's key rather than one registered to the contributor, which upstream CONTRIBUTING item 3 has not been asked about. The branch list marks wip/pr62-theta as superseded by #192, kept rather than deleted. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01HtyPfZ1MWBB94RawgzQgz7
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📝 Summary
Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title clearly summarises the main documentation change: re-signing a reviewed pull request from its reviewed head and recording the squash-merge path. |
| Docstring Coverage | |
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0… |
| Linked Issues check | |
Check skipped because no linked issues were found for this pull request. |
| Out of Scope Changes check | |
Check skipped because no linked issues were found for this pull request. |
| Description check | |
The description covers the change and reason, validation performed and not performed, scope, lockfile status, and contribution checks. It clearly states that CI is pending and explains why the upstrea… |
Full details: Docstring Coverage
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Explanation
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)
Full details: Description check
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Explanation
The description covers the change and reason, validation performed and not performed, scope, lockfile status, and contribution checks. It clearly states that CI is pending and explains why the upstream-main checkbox is not applicable.
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The owner chose to replace the squash commit e28e832 on upstream/glmgampoi-r with #192's three commits, re-signed. Those commits are still reachable as refs/pull/192/head after the branch was deleted, so the entry gives the fetch, the re-sign from the reviewed head, an empty-diff check against e28e832, and a push whose lease names e28e832. The sequence was rehearsed in a scratch clone with a no-signature amend and `git push --dry-run`: three commits rewritten, no diff, lease accepted, nothing pushed. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01HtyPfZ1MWBB94RawgzQgz7
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Inline comments:
Review comments at @notes/commit-signing.md:
- Line 94: Update the branch records in notes/commit-signing.md by adding a
Superseded branches heading and moving wip/pr62-theta from Branches known to
need re-signing into it. Preserve the record and its instruction that the
superseded branch must not be pushed, leaving only active re-signing entries in
the original list.
- Around line 44-49: Update the command sequence after switching to
origin/<prepared-branch> to validate that <reviewed-head> is an
ancestor of HEAD before running the rebase. Abort with an error message when the
ancestry check fails, and leave the existing rebase and push commands unchanged
for valid branches.
- Around line 65-68: Update the affected discussion in the commit-signing
documentation to remove the unsupported CONTRIBUTING item 8 reference and the
incorrect claim that item 3 requires an account-registered key. Preserve the
statements that the change stands on its own upstream and that the path has not
been cleared with Joshua.
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notes/commit-signing.md
[style] ~34-~34: Consider shortening this phrase to just ‘whether’, unless you mean ‘regardless of whether’.
Context: ... an older main it is itself a rebase, whether or not the line before it ran. ### A PR alrea...
(WHETHER)
🔇 Additional comments: 1
notes/commit-signing.md: 1
21-22: LGTM!Also applies to: 33-35
The note said a prepared branch that did not start at the reviewed head would have its push refused, with nothing rewritten. That is false: `git rebase <reviewed-head>` replays such a branch onto the reviewed head, upstream commits it carries included, and the result then pushes as a fast-forward. On wip/pr62-theta it would replay Joshua's 78ffc2f, re-signed as the contributor's, along with copies of the PR's commits. Both re-sign sequences now run the rebase only after `git merge-base --is-ancestor <reviewed-head> HEAD` succeeds. Tried in a scratch worktree: the guard stopped the rebase on wip/pr62-theta and left HEAD unchanged, and on refs/pull/192/head it let the three commits through with the tree unchanged. The squash section now says "upstream CONTRIBUTING" for items 3 and 8, since this fork's CONTRIBUTING numbers its items differently, and the superseded wip/pr62-theta moves from the re-signing list to a section of its own. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01HtyPfZ1MWBB94RawgzQgz7
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| ```sh | ||
| git fetch origin <prepared-branch> <pr-branch> # this fork | ||
| git switch -c <local> origin/<prepared-branch> | ||
| git rebase --exec 'git commit --amend --no-edit -S' <reviewed-head> |
There was a problem hiding this comment.
When the prepared branch diverges before <reviewed-head>—for example, because the wrong prepared branch was selected—this command does not preserve that divergence so the later push can reject it. Git resets the branch to the supplied upstream and replays its unique commits on top, as described in Git’s rebase documentation; the resulting branch therefore contains <reviewed-head> and can fast-forward the PR with unrelated commits, contrary to the safeguard claimed below. Check that <reviewed-head> is already an ancestor of origin/<prepared-branch> before running the rebase.
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2 participants
Change and reason
This is a fork-only note, not meant for upstream. It corrects
notes/commit-signing.md(#191) in three places.A PR already under review. The routine's
git rebase --exec ... upstream/mainreplays every commit after upstream's tip. On a PR branch that started from an oldermain, that is itself a rebase, which upstream CONTRIBUTING item 8 allows only when Joshua asks. A new section re-signs only the commits added since the reviewed head, after checking that the branch contains that head, and pushes them as a fast-forward:Without the check, a branch that lacks the reviewed head would be replayed onto it, upstream commits included, and still push as a fast-forward. On
wip/pr62-thetathat would replay upstream's78ffc2fre-signed.Squash-merging the fork PR instead. This is the path Prepare upstream PR 62 review fixes: theta, label-safe glmGamPoi contrast #192 took. GitHub signs the squash commit and the upstream PR moves forward, but:
mainunchanged (e28e832carries Prepare upstream PR 62 review fixes: theta, label-safe glmGamPoi contrast #192's whole description);Branch lists. You chose to replace
e28e832with Prepare upstream PR 62 review fixes: theta, label-safe glmGamPoi contrast #192's three commits, re-signed. They are still reachable asrefs/pull/192/head:wip/pr62-thetamoves to a new "Superseded branches" section, kept rather than deleted.Validation
All of this ran in scratch clones or worktrees, with a no-signature
--amendstanding in for-S, since this container has no key.--exec ... upstream/main) on upstream PR 62's stack: rewrote all five commits, the two reviewed ones included.--exec ... efe1df1): rewrote the three new commits only, with the tree unchanged.wip/pr62-theta, the check failed, the rebase did not run, and HEAD was unchanged;refs/pull/192/head, it passed, and three commits were rewritten with the tree unchanged.e28e832was empty;git push --dry-runwith the lease reported a forced update ofe28e832only;upstream/glmgampoi-rwas unchanged afterwards.Documentation only: no Julia, R or bun code changed, and no tests were run.
Scope
Leaves out any change to signing configuration. Nothing is pushed to
upstream/glmgampoi-rhere; that push is yours. No lockfile change.Contribution checks
main)🤖 Generated with Claude Code
https://claude.ai/code/session_01HtyPfZ1MWBB94RawgzQgz7