chadtmiller.com/knotless

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What changes

Merge when checks pass. knotless pull merge <url> <pull> --auto sets a pull to merge by itself once it would merge: its checks passed at its head merged with its base, reviewed as its branch asks, with no conflicts. It's for a branch with no merge queue. A branch with the queue already holds a pull until its checks pass, so --auto is refused there, naming --queue. --auto --undo cancels it. The MCP twin is pull_merge with auto and undo, and pull show and pull_show say where it stands.

A record of its own. dev.knotless.autoMerge, set or cancelled, in the writer's account, with the head and branch it was set at. set counts from the owner or a collaborator, and cancelled from them or the pull's author. The latest that counts wins, as for the queue. It's added to the private repository space type.

Cancelled by a push from someone who may not merge it. The set stands at a later head only when the pull's head repository belongs to the owner or a collaborator. Otherwise a fork's author could wait for a maintainer to set it, then push something else. Retargeting cancels it too. Nothing is written for either; auto_merge::standing works it out from the record and the pull.

The runner merges it. The runner that lands the repository's merge queues tries each set pull on each pass, as forge::merge with the default gate, as itself, keeping the branch. Until it would merge, nothing happens and it stays set, through a failed check or a conflict. A runner that may not push merges through the gateway, which now also takes from it one commit that is the merge of a pull whose set stands at its head: first parent the branch's tip, the head as the second or none, and the tree the two make merged.

The merge box on the pages follows in its own pull, with the wording agreed in the mocks ("Merge when checks pass", "Cancel merge").

Why

The queue is now off unless a branch's rule turns it on, so queueing a pull while its checks ran, to have it land by itself, went away on most branches. This brings it back the way GitHub's auto-merge works: set by someone with write access, cancelled by them or the author, and disabled by a push from someone without write access or a change of base. Failed checks and conflicts leave it set, as GitHub's docs say it waits for the requirements to be met.

A separate collection rather than a new state on dev.knotless.queue: the CLI, MCP and queue page read any queue state but left as queued or ejected, so older clients would show a set pull as ejected, and a set would overwrite a queue record under the latest-wins rule.

Like release yank, the new collection needs an existing OAuth login to log in again before it can write one.

How it was checked

auto_merge.rs tests where a set stands. The forge test covers setting and cancelling and who may, the refusals (no runner, the queue, a draft, the flags), and pull show for set, cancelled, retargeted and a fork author's push. A runner test sets two pulls, cancels one, holds their checks, then lets them pass: the set one merges with its branch kept, and the cancelled one is left. The gateway test refuses a runner's other commit onto a branch with a set pull, then takes the merge forge::merge makes as the runner. The MCP test sets, shows and cancels. The rest is left to CI.

Shortcomings

The runner tries each set pull on every pass, reading it afresh, which is fine for the few that are set at once.

It keeps the head branch, as the gateway takes no deletion from such a runner.

No one is told when a check fails while a pull is set.

🤖 Generated with Claude Code

This adds pull merge --auto and --auto --undo (with the MCP twin), a dev.knotless.autoMerge record, a standing rule that cancels the set on a push from someone who can't merge or on a retarget, a runner pass that merges set pulls, and a gateway exception for the runner's merge commit. The design reads soundly. The record's authority rules, the fork-push cancellation and the shape check in lands are all consistent with the docs.

One thing must change: crates/knotless-serve/src/spaces.rs won't compile. COLLECTIONS is declared [&str; 19], but the array already held 19 entries and this pull adds nsid::AUTO_MERGE, so it now has 20. Bump the length to 20.

The checks were still queued when I looked, so none had run. check and test would catch this error, so I mention it only because it blocks everything else. I read every changed file in the diff except the docs pages, the changeset and the test files, which I did not open.

The one thing I asked for is done. COLLECTIONS in crates/knotless-serve/src/spaces.rs is now [&str; 20], which matches the entry this pull adds. I didn't re-review the rest of the diff, which I judged sound last round. I didn't check the CI results.

The only change since my last approval is in crates/knotless-serve/tests/gateway.rs. The runner's merge now uses a fresh Ctx, so it doesn't reuse connections pooled on a runtime that was already dropped. That avoids a hang in the test, and no product code changed. I didn't re-review the rest of the diff, which I approved last round. I didn't check the CI results.

Since my last approval there is one new commit, which touches tests only. gateway_refusals now runs the command line through the sandbox's helper thread, so a debug build's command future no longer overflows the test thread's 2 MiB stack. The background compaction test is quarantined, and the commit message links an issue for fixing it. No product code changed. I went by the commit message and did not open the test diff. I didn't re-review the rest, which I approved earlier, and I didn't check the CI results.

The only change since my last approval is one commit, "The MCP test waits for the index to show a pull set to merge". Going by its message, it touches the MCP test only and changes no product code. I read the commit message and did not open the test diff. I didn't re-review the rest, which I approved earlier, and I didn't check the CI results.

It approved b13aaf16 and has used its review rounds. Since then: coverage only, a cancelled pull in the gateway test, a unit test for assemble, and an unresolved handle falling back with unwrap_or in place of a closure, which behaves the same.

Two commits since my approval touch tests and make small refactors, and none changes the merge-when-checks-pass behaviour. The gateway test now also sets and cancels a second pull. The runner test's review wait goes from 8s to 30s, with the expected message updated to match. In forge.rs, assemble now reads the pull or issue fields through Option::or, with a unit test for a record that is neither. In auto_merge.rs, unwrap_or_else becomes unwrap_or. That is equivalent, and the eagerly built string is negligible. I didn't re-review the rest, which I approved earlier, and I didn't check the CI results.