Release Captain

OpenShell publishes a stable release every Tuesday from a qualified pre-release (RFC 0014). The release captain keeps the week's pre-release train green, coordinates the last merges, cuts the release, and starts the next train.

How to use this skill

When	Ask	What happens
The week before your turn	"I'm release captain next week. Is the train ready?"	Checks that the next version's -pre.1 exists. If not, ask this week's captain to start the train (Tuesday step 6). Then check each weekday that Auto-Tag's pre-release ran and passed (gh run list --workflow release-prerelease.yml --limit 3), and fix failures as they happen (Monday step 3) instead of on Monday.
Monday	"Run the release captain Monday checklist."	Monday steps 1–4.
A pre-release failed	"vX.Y.Z-pre.N failed, help me fix it."	Monday step 3 and Recovery.
Tuesday	"Cut the release."	Tuesday steps 1–6, ending with starting the next train.

Guardrails

Get explicit approval, with the exact command and target SHA, before pushing a tag, dispatching, rerunning, or cancelling a workflow, merging or approving a PR, or posting in Slack or GitHub. Never repoint a stable tag, delete a -pre.N tag, or start a second Pre-release run for a tag; it has no concurrency guard.

How the train works

• A train has one base version, such as v0.1.4, fixed by its -pre.1 tag. A patch train can't take breaking changes to Stable interfaces.
• Release Auto-Tag runs on weekdays at 14:00 Europe/Zurich. If main has commits since the latest -pre.N, it tags the next one and dispatches Pre-release (release-prerelease.yml, about 45 minutes). It skips when the train has no -pre.1 or the base version is already stable.
• Pre-release builds, then publishes and qualifies in parallel, and writes a release-notes preview artifact. Pushing a -pre.N tag by hand starts it.
• Release (release.yml) is dispatched by hand with the stable version. It picks the highest -pre.N on main whose whole Pre-release run passed, creates the stable tag on that commit, and publishes without requalifying.

Setup

export GH_REPO=NVIDIA/OpenShell
git fetch origin main --tags --force
PREV=$(git tag -l 'v*' --sort=-v:refname | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$' | head -1)
git tag -l 'v*' --sort=-v:refname | grep -E -- '-pre\.[0-9]+$' | head -5

Find the Pre-release run for a tag. A tag pushed by hand runs on the tag; an Auto-Tag run is dispatched on main:

TAG=vX.Y.Z-pre.N
gh run list --workflow release-prerelease.yml --branch "$TAG"
gh run list --workflow release-prerelease.yml --event workflow_dispatch --commit "$(git rev-parse "$TAG^{commit}")"

Preview the candidate Release would promote, read-only:

VERSION=vX.Y.Z
wt=$(mktemp -d)
git worktree add -q --detach "$wt" origin/main
(cd "$wt" && GITHUB_REPOSITORY=NVIDIA/OpenShell uv run -q --no-project python tasks/scripts/select-release-candidate.py "$VERSION" --branch main | jq .)
git worktree remove --force "$wt"

Monday: pre-flight

1. Check the candidate. Run the preview. If the latest -pre.N isn't the candidate, its run failed; read why:

   RUN=<run-id>
   gh run view "$RUN" --json jobs --jq '.jobs[] | select(.conclusion == "failure" or .conclusion == "timed_out") | "\(.name)\t\(.url)"'
   gh run view "$RUN" --log-failed
   

   If the next version has no -pre.1, start the train (Tuesday step 6).

2. Triage the compatibility review for the candidate's run. It's advisory, and a green job doesn't mean it found no breaks:

   ATTEMPT=$(gh run view "$RUN" --json attempt --jq .attempt)
   dir=$(mktemp -d)
   gh run download "$RUN" -n "compatibility-review-run-$RUN-attempt-$ATTEMPT" -D "$dir"
   jq '{status, verdict: .review.verdict}' "$dir/report.json"
   cat "$dir/report.md"
   

   Only complete with no_unaddressed_breaks is clean. A real break needs a fix, a revert, a minor train, or a maintainer-approved exception with upgrade steps in the release notes.

3. Fix forward. A failed pre-release doesn't end the train. Find the cause, and let the failed run finish rather than cancelling it.

   A rerun repeats the same commit and workflow, so it only helps with a transient failure (see Recovery). Anything that needs a code or workflow fix ships in a new number: that -pre.N stays failed, and Release skips it. Merge the fix, then cut the next -pre.N from the tip of main after approval:

   gh workflow run release-auto-tag.yml --ref main
   

   Tag a specific commit by hand (as in Tuesday step 6) only when the tip of main isn't the commit you want.

4. Draft the coordination post. Start a thread in the OpenShell channel of the CNCF Slack. The release ships from main with no release branch, so the thread is for getting ready PRs reviewed and merged before the cutoff. List approved PRs:

   gh pr list --base main --state open --search "review:approved" --json number,title,author --jq '.[] | "#\(.number) \(.title) (@\(.author.login))"'
   

   The release ships the final pre-release's commit, if it passes. Pick a cutoff before Tuesday's Auto-Tag run, or a later one after which you tag the final pre-release by hand. Don't promise that everything merged by the cutoff ships, or name the next version.

   :thread: OpenShell vX.Y.Z release, Tuesday <date>. I'm release captain this week.
   
   Status: vX.Y.Z-pre.N (<commit>) passed qualification. <blockers and owners, or "No blockers.">
   
   Reply here with any ready PRs you'd like in vX.Y.Z. Merge cutoff is <HH:MM UTC> (<local time>) Tuesday. <"Tuesday's automatic pre-release picks up everything merged by then" | "I'll cut the final pre-release after the cutoff">, and vX.Y.Z ships from it if it passes qualification. Anything that misses it goes in the next release.
   

   If the pre-release that ships was cut before the posted cutoff, say so in the thread, with its commit and time.

Tuesday: cut the release

1. Select the final candidate. For a late cutoff, cut the final -pre.N after the cutoff as in Monday step 3. When it finishes, run the preview and repeat Monday step 2 for its run.

2. Request approval. Present the candidate tag, commit, qualification run, compatibility assessment, commits since $PREV, and release notes preview:

   git log --oneline --no-merges "$PREV..<candidate_tag>"
   gh run download "$RUN" -n release-notes -D "$dir/notes" && cat "$dir/notes/release-notes.md"
   

   The notes come from each PR's "Release Notes" section. To fix them, edit the PR, then preview with gh workflow run release.yml --ref main -f tag="$VERSION" -f notes-only=true.

3. Dispatch the release. After approval:

   gh workflow run release.yml --ref main -f tag="$VERSION"
   

4. Watch and verify. Check that Select Qualified Prerelease names the approved candidate, the GitHub Release has assets, no job failed, and the wheel reached PyPI:

   gh run watch <run-id> --exit-status
   gh release view "$VERSION" --json isPrerelease,publishedAt,assets --jq '{isPrerelease, publishedAt, assets: (.assets | length)}'
   

5. Close the loop. Draft a short reply to the coordination thread. Point to the release notes rather than repeating them:

   :white_check_mark: :ship: OpenShell vX.Y.Z is out: https://github.com/NVIDIA/OpenShell/releases/tag/vX.Y.Z
   
   It shipped from vX.Y.Z-pre.N (<commit>). I'll be starting the <next version>-pre.* jobs shortly for next week.
   
   Please check the release notes for upgrade notes that operators might care about. I'm also moving everything still open in the X.Y.Z milestone to <next milestone>.
   
   Thanks everyone!
   

   After approval, move the milestone's open items to the next milestone.

6. Start the next train. This is this week's captain's last duty. Until the next -pre.1 exists, Auto-Tag skips. Agree with the maintainers on patch (the default) or minor (version selection). Seed it on a commit after $VERSION with a passing Release Dev run:

   for sha in $(git rev-list --max-count=10 "$VERSION..origin/main"); do
     state=$(gh run list --workflow release-dev.yml --commit "$sha" --json status,conclusion --jq '.[0] | if .status == "completed" then .conclusion else .status end')
     echo "${sha:0:9} ${state:-none} $(git log -1 --format=%s "$sha")"
   done
   

   After approval, push the tag. The -c and /dev/null keep git from signing the tag and opening an editor:

   NEXT=vX.Y.Z-pre.1 NEXT_SHA=<commit>
   git -c tag.gpgSign=false tag "$NEXT" "$NEXT_SHA" </dev/null
   git push origin "refs/tags/$NEXT"
   

   You're done when that Pre-release run passes, or its failure is handed to next week's captain.

Recovery

Symptom	Action
Transient infrastructure failure in a pre-release, including a registry push	After approval, gh run rerun <run-id> --failed. Release won't select the run until all of it passes.
Pre-release run ends in startup_failure	The workflow file is invalid at that commit. Fix it in a new -pre.N (Monday step 3).
Code defect or Cargo Deny advisory	Rerunning won't help. Fix it in a new -pre.N (Monday step 3).
Release fails after selection	After approval, rerun only the failed jobs that haven't published.

Related

• release-openshell: the short procedure behind Tuesday steps 1–4.
• watch-github-actions: general gh run monitoring and log retrieval.
• CI.md: release workflows, qualification profile, and scanner policies.