From fa8b21cea7247623f5eec5bbf4609e4af2586d34 Mon Sep 17 00:00:00 2001
From: Hailey <me@haileyok.com>
Date: Fri, 15 Mar 2024 12:28:21 -0700
Subject: [PATCH] Add package diff PR labeler (#3212)

* add PR labeler

* test cache

* rm change
---
 .github/workflows/pull-request-commit.yml | 185 ++++++++++++++++++++++
 1 file changed, 185 insertions(+)
 create mode 100644 .github/workflows/pull-request-commit.yml

diff --git a/.github/workflows/pull-request-commit.yml b/.github/workflows/pull-request-commit.yml
new file mode 100644
index 00000000..76dc4327
--- /dev/null
+++ b/.github/workflows/pull-request-commit.yml
@@ -0,0 +1,185 @@
+# Credit https://github.com/expo/expo
+# https://github.com/expo/expo/blob/main/.github/workflows/pr-labeler.yml
+---
+name: PR labeler
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    types: [opened, synchronize]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test-suite-fingerprint:
+    runs-on: ubuntu-22.04
+    if: ${{ github.event.pull_request.head.repo.full_name == github.repository || github.event_name == 'push' }}
+    # REQUIRED: limit concurrency when pushing main(default) branch to prevent conflict for this action to update its fingerprint database
+    concurrency: fingerprint-${{ github.event_name != 'pull_request' && 'main' || github.run_id }}
+    permissions:
+      # REQUIRED: Allow comments of PRs
+      pull-requests: write
+      # REQUIRED: Allow updating fingerprint in acton caches
+      actions: write
+    steps:
+      - name: ⬇️ Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 100
+
+      - name: ⬇️ Fetch commits from base branch
+        run: git fetch origin main:main --depth 100
+        if: github.event_name == 'pull_request'
+
+      - name: 🔧 Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: .nvmrc
+          cache: yarn
+
+      - name: ⚙️ Install Dependencies
+        run: yarn install
+
+      - name: Get the base commit
+        id: base-commit
+        run: |
+          # Since we limit this pr-labeler workflow only triggered from limited paths, we should use custom base commit
+          echo base-commit=$(git log -n 1 main --pretty=format:'%H' -- .github/workflows/pr-labeler.yml packages yarn.lock) >> "$GITHUB_OUTPUT"
+
+      - name: 📷 Check fingerprint
+        id: fingerprint
+        uses: expo/expo-github-action/fingerprint@main
+        with:
+          previous-git-commit: ${{ steps.base-commit.outputs.base-commit }}
+
+      - name: 👀 Debug fingerprint
+        run: |
+          echo "previousGitCommit=${{ steps.fingerprint.outputs.previous-git-commit }} currentGitCommit=${{ steps.fingerprint.outputs.current-git-commit }}"
+          echo "isPreviousFingerprintEmpty=${{ steps.fingerprint.outputs.previous-fingerprint == '' }}"
+
+      - name: 🏷️ Labeling PR
+        uses: actions/github-script@v6
+        if: ${{ github.event_name == 'pull_request' && steps.fingerprint.outputs.fingerprint-diff == '[]' }}
+        with:
+          script: |
+            try {
+              await github.rest.issues.removeLabel({
+                issue_number: context.issue.number,
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                name: ['bot: fingerprint changed']
+              })
+            } catch (e) {
+              if (e.status != 404) {
+                throw e;
+              }
+            }
+            github.rest.issues.addLabels({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              labels: ['bot: fingerprint compatible']
+            })
+
+      - name: 🏷️ Labeling PR
+        uses: actions/github-script@v6
+        if: ${{ github.event_name == 'pull_request' && steps.fingerprint.outputs.fingerprint-diff != '[]' }}
+        with:
+          script: |
+            try {
+              await github.rest.issues.removeLabel({
+                issue_number: context.issue.number,
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                name: ['bot: fingerprint compatible']
+              })
+            } catch (e) {
+              if (e.status != 404) {
+                throw e;
+              }
+            }
+            github.rest.issues.addLabels({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              labels: ['bot: fingerprint changed']
+            })
+
+      - name: 🔍 Find old comment if it exists
+        uses: peter-evans/find-comment@v2
+        if: ${{ github.event_name == 'pull_request' }}
+        id: old_comment
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          comment-author: 'expo-bot'
+          body-includes: <!-- pr-labeler comment -->
+
+      - name: 💬 Add comment with fingerprint
+        if: ${{ github.event_name == 'pull_request' && steps.fingerprint.outputs.fingerprint-diff != '[]' && steps.old_comment.outputs.comment-id == '' }}
+        uses: actions/github-script@v6
+        with:
+          script: |
+            const diff = JSON.stringify(${{ steps.fingerprint.outputs.fingerprint-diff}}, null, 2);
+            const body = `<!-- pr-labeler comment -->
+            The Pull Request introduced fingerprint changes against the base commit: ${{ steps.fingerprint.outputs.previous-git-commit }}
+            <details><summary>Fingerprint diff</summary>
+
+            \`\`\`json
+            ${diff}
+            \`\`\`
+
+            </details>
+
+            ---
+            *Generated by [PR labeler](https://github.com/expo/expo/actions/workflows/pr-labeler.yml) 🤖*
+            `;
+
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: body,
+            });
+
+      - name: 💬 Update comment with fingerprint
+        if: ${{ github.event_name == 'pull_request' && steps.fingerprint.outputs.fingerprint-diff != '[]' && steps.old_comment.outputs.comment-id != '' }}
+        uses: actions/github-script@v6
+        with:
+          script: |
+            const diff = JSON.stringify(${{ steps.fingerprint.outputs.fingerprint-diff}}, null, 2);
+            const body = `<!-- pr-labeler comment -->
+            The Pull Request introduced fingerprint changes against the base commit: ${{ steps.fingerprint.outputs.previous-git-commit }}
+            <details><summary>Fingerprint diff</summary>
+
+            \`\`\`json
+            ${diff}
+            \`\`\`
+
+            </details>
+
+            ---
+            *Generated by [PR labeler](https://github.com/expo/expo/actions/workflows/pr-labeler.yml) 🤖*
+            `;
+
+            github.rest.issues.updateComment({
+              issue_number: context.issue.number,
+              comment_id: '${{ steps.old_comment.outputs.comment-id }}',
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: body,
+            });
+
+      - name: 💬 Delete comment with fingerprint
+        if: ${{ github.event_name == 'pull_request' && steps.fingerprint.outputs.fingerprint-diff == '[]' && steps.old_comment.outputs.comment-id != '' }}
+        uses: actions/github-script@v6
+        with:
+          script: |
+            github.rest.issues.deleteComment({
+              issue_number: context.issue.number,
+              comment_id: '${{ steps.old_comment.outputs.comment-id }}',
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+            });
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