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Playground preview: derive PR from the triggering run #978

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Merged
obenland merged 1 commit into from
Aug 26, 2026
Merged

Playground preview: derive PR from the triggering run #978

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44 changes: 26 additions & 18 deletions .github/workflows/pr-playground-preview.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -30,35 +30,43 @@ jobs:
pull-requests: write

steps:
- name: Extract PR metadata from artifact name
- name: Resolve trusted PR metadata
id: pr-metadata
uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
with:
script: |
const artifacts = await github.rest.actions.listWorkflowRunArtifacts({
// The build runs untrusted PR code; the run's head SHA is the
// only trusted value.
const trustedSha = context.payload.workflow_run.head_sha;

// Resolve the PR from the trusted head SHA, not the PR number in
// the artifact name.
const pulls = await github.paginate(github.rest.pulls.list, {
owner: context.repo.owner,
repo: context.repo.repo,
run_id: ${{ github.event.workflow_run.id }},
state: 'open',
per_page: 100,
});

const artifact = artifacts.data.artifacts.find(a =>
a.name.startsWith("ai-plugin-zip-pr")
);

if (!artifact) {
throw new Error('Could not find plugin artifact');
const pr = pulls.find(p => p.head.sha === trustedSha);
if (!pr) {
throw new Error(`Could not resolve an open pull request for head SHA ${trustedSha}`);
}

// Parse: ai-plugin-zip-pr123-abc123def...
const match = artifact.name.match(/^ai-plugin-zip-pr(\d+)-(.+)$/);
if (!match) {
throw new Error(`Could not parse artifact name: ${artifact.name}`);
// Match the artifact by the name the trusted build derives, not by
// prefix.
const expectedName = `ai-plugin-zip-pr${pr.number}-${trustedSha}`;
const artifacts = await github.paginate(github.rest.actions.listWorkflowRunArtifacts, {
owner: context.repo.owner,
repo: context.repo.repo,
run_id: context.payload.workflow_run.id,
});
const artifact = artifacts.find(a => a.name === expectedName);
if (!artifact) {
throw new Error(`Could not find plugin artifact named ${expectedName}`);
}

const [, prNumber, commitSha] = match;

core.setOutput('pr-number', prNumber);
core.setOutput('commit-sha', commitSha);
core.setOutput('pr-number', String(pr.number));
core.setOutput('commit-sha', trustedSha);
core.setOutput('artifact-name', artifact.name);

- name: Expose built artifact
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