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| 1 | +# Generated by Array CLI - https://github.com/posthog/array |
| 2 | +# Blocks stacked PRs until their downstack dependencies are merged |
| 3 | +# Only runs for PRs managed by Array (detected via stack comment marker) |
| 4 | + |
| 5 | +name: Stack Check |
| 6 | + |
| 7 | +on: |
| 8 | + pull_request: |
| 9 | + types: [opened, synchronize, reopened, edited] |
| 10 | + pull_request_target: |
| 11 | + types: [closed] |
| 12 | + |
| 13 | +permissions: |
| 14 | + contents: read |
| 15 | + |
| 16 | +jobs: |
| 17 | + check: |
| 18 | + runs-on: ubuntu-latest |
| 19 | + if: github.event_name == 'pull_request' |
| 20 | + permissions: |
| 21 | + pull-requests: read |
| 22 | + issues: read |
| 23 | + steps: |
| 24 | + - name: Check stack dependencies |
| 25 | + uses: actions/github-script@v7 |
| 26 | + with: |
| 27 | + script: | |
| 28 | + const pr = context.payload.pull_request; |
| 29 | +
|
| 30 | + // Check if this is an Array-managed PR by looking for stack comment |
| 31 | + const { data: comments } = await github.rest.issues.listComments({ |
| 32 | + owner: context.repo.owner, |
| 33 | + repo: context.repo.repo, |
| 34 | + issue_number: pr.number |
| 35 | + }); |
| 36 | +
|
| 37 | + const isArrayPR = comments.some(c => |
| 38 | + c.body.includes('<!-- array-stack-comment -->') |
| 39 | + ); |
| 40 | +
|
| 41 | + if (!isArrayPR) { |
| 42 | + console.log('Not an Array PR, skipping'); |
| 43 | + return; |
| 44 | + } |
| 45 | +
|
| 46 | + const baseBranch = pr.base.ref; |
| 47 | + const trunk = ['main', 'master', 'develop']; |
| 48 | +
|
| 49 | + if (trunk.includes(baseBranch)) { |
| 50 | + console.log('Base is trunk, no dependencies'); |
| 51 | + return; |
| 52 | + } |
| 53 | +
|
| 54 | + async function getBlockers(base, visited = new Set()) { |
| 55 | + if (trunk.includes(base) || visited.has(base)) { |
| 56 | + return []; |
| 57 | + } |
| 58 | + visited.add(base); |
| 59 | +
|
| 60 | + const { data: prs } = await github.rest.pulls.list({ |
| 61 | + owner: context.repo.owner, |
| 62 | + repo: context.repo.repo, |
| 63 | + state: 'open', |
| 64 | + head: `${context.repo.owner}:${base}` |
| 65 | + }); |
| 66 | +
|
| 67 | + if (prs.length === 0) { |
| 68 | + return []; |
| 69 | + } |
| 70 | +
|
| 71 | + const blocker = prs[0]; |
| 72 | + const upstream = await getBlockers(blocker.base.ref, visited); |
| 73 | + return [{ number: blocker.number, title: blocker.title }, ...upstream]; |
| 74 | + } |
| 75 | +
|
| 76 | + const blockers = await getBlockers(baseBranch); |
| 77 | +
|
| 78 | + if (blockers.length > 0) { |
| 79 | + const list = blockers.map(b => `#${b.number} (${b.title})`).join('\n - '); |
| 80 | + core.setFailed(`Blocked by:\n - ${list}\n\nMerge these PRs first (bottom to top).`); |
| 81 | + } else { |
| 82 | + console.log('All dependencies merged, ready to merge'); |
| 83 | + } |
| 84 | +
|
| 85 | + recheck-dependents: |
| 86 | + runs-on: ubuntu-latest |
| 87 | + if: >- |
| 88 | + github.event_name == 'pull_request_target' && |
| 89 | + github.event.action == 'closed' && |
| 90 | + github.event.pull_request.merged == true |
| 91 | + permissions: |
| 92 | + pull-requests: write |
| 93 | + issues: read |
| 94 | + steps: |
| 95 | + - name: Trigger recheck of dependent PRs |
| 96 | + uses: actions/github-script@v7 |
| 97 | + with: |
| 98 | + script: | |
| 99 | + const pr = context.payload.pull_request; |
| 100 | +
|
| 101 | + // Check if this is an Array-managed PR |
| 102 | + const { data: comments } = await github.rest.issues.listComments({ |
| 103 | + owner: context.repo.owner, |
| 104 | + repo: context.repo.repo, |
| 105 | + issue_number: pr.number |
| 106 | + }); |
| 107 | +
|
| 108 | + const isArrayPR = comments.some(c => |
| 109 | + c.body.includes('<!-- array-stack-comment -->') |
| 110 | + ); |
| 111 | +
|
| 112 | + if (!isArrayPR) { |
| 113 | + console.log('Not an Array PR, skipping'); |
| 114 | + return; |
| 115 | + } |
| 116 | +
|
| 117 | + const mergedBranch = pr.head.ref; |
| 118 | +
|
| 119 | + const { data: dependentPRs } = await github.rest.pulls.list({ |
| 120 | + owner: context.repo.owner, |
| 121 | + repo: context.repo.repo, |
| 122 | + base: mergedBranch, |
| 123 | + state: 'open' |
| 124 | + }); |
| 125 | +
|
| 126 | + for (const dependentPR of dependentPRs) { |
| 127 | + console.log(`Re-checking PR #${dependentPR.number}`); |
| 128 | + await github.rest.pulls.update({ |
| 129 | + owner: context.repo.owner, |
| 130 | + repo: context.repo.repo, |
| 131 | + pull_number: dependentPR.number, |
| 132 | + base: 'main' |
| 133 | + }); |
| 134 | + } |
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