src/workflows/find-past-built-pr.ts

import { setOutput } from '@actions/core'

import github from './github'
import { getActionContext } from './action-context'
import { octoSecondaryRatelimitRetry } from './secondary-ratelimit-retry'

async function main() {
  const sha = await getBuiltSHA()
  console.log({ sha })

  const actionContext = getActionContext()
  const { owner, repo } = actionContext

  const octokit = github()
  let number = ''

  const q = `${sha} repo:"${owner}/${repo}"`
  const { data } = await octoSecondaryRatelimitRetry(() =>
    octokit.rest.search.issuesAndPullRequests({ q }),
  )
  for (const issue of data.items) {
    console.log('ID:', issue.id)
    console.log('Number:', issue.number)
    console.log('URL:', issue.html_url)
    number = String(issue.number)
    if (number) {
      // We've found the issue (pull request), but before we accept
      // this `number`, check that the issue isn't locked.
      if (issue.locked) {
        number = ''
      }
      break
    }
  }

  setOutput('number', number)
}

async function getBuiltSHA() {
  const r = await fetch('https://docs.github.com/_build')
  if (!r.ok) {
    throw new Error(`HTTP ${r.status}: ${r.statusText}`)
  }
  const body = await r.text()
  const sha = body.trim()
  if (!/[a-f0-9]{40}/.test(sha)) {
    throw new Error(`Response body does not look like a SHA ('${body.slice(0, 100)}'...)`)
  }
  return sha
}

main()