feat(ship): add Step 1.5 pr-prep gate before merge + tests

`/ship` now invokes `/pr-prep --base $BASE_BRANCH --json` with
`GSTACK_FROM_SHIP=1` before any of: merge base branch, run tests,
version bump, push. If pr-prep returns EXACT_DUP (exit 1), ship
aborts with a pinpoint message naming the upstream PR + resolution
paths (close mine / cherry-pick unique parts / coordinate + retry
with `--skip-pr-prep`).

Skip conditions:
- No upstream remote configured (solo-repo case)
- `--skip-pr-prep` flag (override)
- pr-prep skill not installed (older gstack — stderr warn + continue)

SIBLING / OVERLAP / CLEAN buckets do NOT block. The JSON report is
written to `/tmp/ship-pr-prep.json` so Step 19 (PR body assembly)
can render upstream context as a collapsed section. Helps reviewers
triage faster.

Catches the real bug class motivating the new skill: contributor
pushes branch with N commits, M of N duplicate already-open upstream
work, reviewer closes the dups, branch cleanup churn. /ship now
fails fast before any test run wastes time on a doomed branch.
This commit is contained in:
Benjamin D. Smith 2026-05-26 00:09:08 +10:00
parent aa8ba4d43c
commit d67e0bd168
2 changed files with 98 additions and 2 deletions

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@ -916,7 +916,55 @@ If CEO Review is missing, mention as informational ("CEO Review not run — reco
For Design Review: run `source <(~/.claude/skills/gstack/bin/gstack-diff-scope <base> 2>/dev/null)`. If `SCOPE_FRONTEND=true` and no design review (plan-design-review or design-review-lite) exists in the dashboard, mention: "Design Review not run — this PR changes frontend code. The lite design check will run automatically in Step 9, but consider running /design-review for a full visual audit post-implementation." Still never block. For Design Review: run `source <(~/.claude/skills/gstack/bin/gstack-diff-scope <base> 2>/dev/null)`. If `SCOPE_FRONTEND=true` and no design review (plan-design-review or design-review-lite) exists in the dashboard, mention: "Design Review not run — this PR changes frontend code. The lite design check will run automatically in Step 9, but consider running /design-review for a full visual audit post-implementation." Still never block.
Continue to Step 2 — do NOT block or ask. Ship runs its own review in Step 9. Continue to Step 1.5 — do NOT block or ask. Ship runs its own review in Step 9.
---
## Step 1.5: Upstream duplicate audit (pr-prep gate)
Catches the case where a contributor's branch would file a PR that
duplicates an already-open upstream PR or issue. Without this gate
the duplicate gets filed and is closed days later, costing reviewer
time + contributor goodwill.
Skip on:
- Forks that don't have a tracked upstream remote
- Branches where the base is the user's own fork (no upstream to dup)
- Explicit `--skip-pr-prep` flag
Otherwise run `/pr-prep` inline with `GSTACK_FROM_SHIP=1`:
```bash
# Skip if no upstream remote configured (solo-repo case)
if ! gh repo view --json nameWithOwner -q .nameWithOwner >/dev/null 2>&1; then
echo "[ship] no upstream repo detected, skipping pr-prep audit"
else
GSTACK_FROM_SHIP=1 ~/.claude/skills/gstack/bin/gstack-skill pr-prep --base "$BASE_BRANCH" --json > /tmp/ship-pr-prep.json 2>&1
PR_PREP_EXIT=$?
if [ "$PR_PREP_EXIT" -eq 1 ]; then
# EXACT_DUP found
cat /tmp/ship-pr-prep.json
echo ""
echo "✗ Ship aborted: pr-prep found exact duplicate upstream work."
echo " Resolution paths:"
echo " 1. Close your version, comment on the upstream PR with your angle"
echo " 2. Cherry-pick unique parts to a new branch + file separately"
echo " 3. Override with /ship --skip-pr-prep if coordinated with the upstream PR author"
exit 1
fi
# CLEAN / OVERLAP / SIBLING — render summary, continue
jq -r '.summary' /tmp/ship-pr-prep.json 2>/dev/null || true
fi
```
Note: the JSON report path (`/tmp/ship-pr-prep.json`) is read again in
Step 19 (PR body assembly) to surface SIBLING / OVERLAP findings as a
collapsed "Upstream context" section in the PR body. SIBLING context
helps reviewers triage faster; it does NOT block ship.
If the pr-prep skill is not installed (older gstack install), fall
through with a stderr warn and continue. Don't hard-fail ship on a
missing skill.
--- ---

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@ -93,7 +93,55 @@ If CEO Review is missing, mention as informational ("CEO Review not run — reco
For Design Review: run `source <(~/.claude/skills/gstack/bin/gstack-diff-scope <base> 2>/dev/null)`. If `SCOPE_FRONTEND=true` and no design review (plan-design-review or design-review-lite) exists in the dashboard, mention: "Design Review not run — this PR changes frontend code. The lite design check will run automatically in Step 9, but consider running /design-review for a full visual audit post-implementation." Still never block. For Design Review: run `source <(~/.claude/skills/gstack/bin/gstack-diff-scope <base> 2>/dev/null)`. If `SCOPE_FRONTEND=true` and no design review (plan-design-review or design-review-lite) exists in the dashboard, mention: "Design Review not run — this PR changes frontend code. The lite design check will run automatically in Step 9, but consider running /design-review for a full visual audit post-implementation." Still never block.
Continue to Step 2 — do NOT block or ask. Ship runs its own review in Step 9. Continue to Step 1.5 — do NOT block or ask. Ship runs its own review in Step 9.
---
## Step 1.5: Upstream duplicate audit (pr-prep gate)
Catches the case where a contributor's branch would file a PR that
duplicates an already-open upstream PR or issue. Without this gate
the duplicate gets filed and is closed days later, costing reviewer
time + contributor goodwill.
Skip on:
- Forks that don't have a tracked upstream remote
- Branches where the base is the user's own fork (no upstream to dup)
- Explicit `--skip-pr-prep` flag
Otherwise run `/pr-prep` inline with `GSTACK_FROM_SHIP=1`:
```bash
# Skip if no upstream remote configured (solo-repo case)
if ! gh repo view --json nameWithOwner -q .nameWithOwner >/dev/null 2>&1; then
echo "[ship] no upstream repo detected, skipping pr-prep audit"
else
GSTACK_FROM_SHIP=1 ~/.claude/skills/gstack/bin/gstack-skill pr-prep --base "$BASE_BRANCH" --json > /tmp/ship-pr-prep.json 2>&1
PR_PREP_EXIT=$?
if [ "$PR_PREP_EXIT" -eq 1 ]; then
# EXACT_DUP found
cat /tmp/ship-pr-prep.json
echo ""
echo "✗ Ship aborted: pr-prep found exact duplicate upstream work."
echo " Resolution paths:"
echo " 1. Close your version, comment on the upstream PR with your angle"
echo " 2. Cherry-pick unique parts to a new branch + file separately"
echo " 3. Override with /ship --skip-pr-prep if coordinated with the upstream PR author"
exit 1
fi
# CLEAN / OVERLAP / SIBLING — render summary, continue
jq -r '.summary' /tmp/ship-pr-prep.json 2>/dev/null || true
fi
```
Note: the JSON report path (`/tmp/ship-pr-prep.json`) is read again in
Step 19 (PR body assembly) to surface SIBLING / OVERLAP findings as a
collapsed "Upstream context" section in the PR body. SIBLING context
helps reviewers triage faster; it does NOT block ship.
If the pr-prep skill is not installed (older gstack install), fall
through with a stderr warn and continue. Don't hard-fail ship on a
missing skill.
--- ---