From e2dc4219add64f4412b212c4c20c9012589b2392 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <peterbe@github.com>
Date: Mon, 30 Jan 2023 10:18:03 -0500
Subject: [PATCH] Post about merged PR going into production (#34095)

---
 .github/actions-scripts/find-past-built-pr.js | 44 +++++++++++++
 .github/workflows/notify-about-deployment.yml | 63 +++++++++++++++++++
 2 files changed, 107 insertions(+)
 create mode 100755 .github/actions-scripts/find-past-built-pr.js
 create mode 100644 .github/workflows/notify-about-deployment.yml

diff --git a/.github/actions-scripts/find-past-built-pr.js b/.github/actions-scripts/find-past-built-pr.js
new file mode 100755
index 000000000000..b73448029749
--- /dev/null
+++ b/.github/actions-scripts/find-past-built-pr.js
@@ -0,0 +1,44 @@
+#!/usr/bin/env node
+import got from 'got'
+
+import { setOutput } from '@actions/core'
+
+import github from '../../script/helpers/github.js'
+import { getActionContext } from './lib/action-context.js'
+
+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}/${repo}"`
+  const { data } = await octokit.rest.search.issuesAndPullRequests({ q })
+  for (const issue of data.items) {
+    // console.log(issue)
+    console.log('ID:', issue.id)
+    console.log('Number:', issue.number)
+    console.log('URL:', issue.html_url)
+    number = issue.number
+    if (number) {
+      break
+    }
+  }
+
+  setOutput('number', number)
+}
+
+async function getBuiltSHA() {
+  const r = await got('https://docs.github.com/_build')
+  const sha = r.body.trim()
+  if (!/[a-f0-9]{40}/.test(sha)) {
+    throw new Error(`Response body does not look like a SHA ('${r.body.slice(0, 100)}'...)`)
+  }
+  return sha
+}
+
+main()
diff --git a/.github/workflows/notify-about-deployment.yml b/.github/workflows/notify-about-deployment.yml
new file mode 100644
index 000000000000..6326acee7caa
--- /dev/null
+++ b/.github/workflows/notify-about-deployment.yml
@@ -0,0 +1,63 @@
+name: Notify about production deployment
+
+# **What it does**: Posts a comment on the PR whose merge got into production.
+# **Why we have it**: So that the PR author can be informed when their merged PR is in production.
+# **Who does it impact**: Writers
+
+on:
+  workflow_dispatch:
+  workflow_run:
+    # Note, we could do this after the "Purge Fastly" finished
+    workflows: ['Azure Production - Build and Deploy']
+    types:
+      - completed
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  find-pr-and-post-comment:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repo
+        uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
+
+      - uses: ./.github/actions/node-npm-setup
+
+      # The "Purge Fastly" action takes about 6 minutes to purge all
+      # languages. First does the language agnostic URLs, then English,
+      # then all the other languages.
+      # So it takes about ~30 seconds until it has sent the purge for
+      # all English docs.
+      - name: Sleep a little to give Fastly Purge a chance
+        run: sleep 30
+
+      - name: Find last PR
+        id: get-number
+        timeout-minutes: 3
+        env:
+          GITHUB_TOKEN: ${{ secrets.DOCUBOT_REPO_PAT }}
+        run: .github/actions-scripts/find-past-built-pr.js
+
+      - name: Find content directory changes comment
+        if: ${{ steps.get-number.outputs.number != '' }}
+        uses: peter-evans/find-comment@f4499a714d59013c74a08789b48abe4b704364a0
+        id: findComment
+        with:
+          issue-number: ${{ steps.get-number.outputs.number }}
+          comment-author: 'github-actions[bot]'
+          body-includes: '<!-- GONE_TO_PRODUCTION -->'
+
+      - name: Update comment
+        if: ${{ steps.get-number.outputs.number != '' }}
+        uses: peter-evans/create-or-update-comment@c9fcb64660bc90ec1cc535646af190c992007c32
+        with:
+          comment-id: ${{ steps.findComment.outputs.comment-id }}
+          issue-number: ${{ steps.get-number.outputs.number }}
+          body: |
+            <!-- GONE_TO_PRODUCTION -->
+            🚀 **This pull request has gone into production!**
+
+            The SHA of https://docs.github.com/_build matches the merge commit in this PR.
+          edit-mode: replace