Fix bot for updating snapshots (#52)

.github/workflows/update_galata_references.yaml

@@ -13,27 +13,61 @@ defaults:
     shell: bash -l {0}
 
 jobs:
-  update-reference-screenshots:
-    name: Update Galata References
-    if: ${{ github.event.issue.pull_request && contains(github.event.comment.body, 'please update snapshots') }}
+  update-snapshots:
+    if: >
+      (
+        github.event.issue.author_association == 'OWNER' ||
+        github.event.issue.author_association == 'COLLABORATOR' ||
+        github.event.issue.author_association == 'MEMBER'
+      ) && github.event.issue.pull_request && contains(github.event.comment.body, 'please update snapshots')
     runs-on: ubuntu-latest
 
     steps:
+      - name: React to the triggering comment
+        run: |
+          gh api repos/${{ github.repository }}/issues/comments/${{ github.event.comment.id }}/reactions --raw-field 'content=+1'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Configure git to use https
-        run: git config --global hub.protocol https
+      - name: Get PR Info
+        id: pr
+        env:
+          PR_NUMBER: ${{ github.event.issue.number }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_REPO: ${{ github.repository }}
+          COMMENT_AT: ${{ github.event.comment.created_at }}
+        run: |
+          pr="$(gh api /repos/${GH_REPO}/pulls/${PR_NUMBER})"
+          head_sha="$(echo "$pr" | jq -r .head.sha)"
+          pushed_at="$(echo "$pr" | jq -r .pushed_at)"
 
-      - name: Install hub
-        run: sudo apt-get update && sudo apt-get install -y hub
+          if [[ $(date -d "$pushed_at" +%s) -gt $(date -d "$COMMENT_AT" +%s) ]]; then
+              echo "Updating is not allowed because the PR was pushed to (at $pushed_at) after the triggering comment was issued (at $COMMENT_AT)"
+              exit 1
+          fi
+
+          echo "head_sha=$head_sha" >> $GITHUB_OUTPUT
 
       - name: Checkout the branch from the PR that triggered the job
-        run: hub pr checkout ${{ github.event.issue.number }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: gh pr checkout ${{ github.event.issue.number }}
+
+      - name: Validate the fetched branch HEAD revision
+        env:
+          EXPECTED_SHA: ${{ steps.pr.outputs.head_sha }}
+        run: |
+          actual_sha="$(git rev-parse HEAD)"
+
+          if [[ "$actual_sha" != "$EXPECTED_SHA" ]]; then
+              echo "The HEAD of the checked out branch ($actual_sha) differs from the HEAD commit available at the time when trigger comment was submitted ($EXPECTED_SHA)"
+              exit 1
+          fi
 
       - name: Download extension package
         uses: dawidd6/action-download-artifact@v2
@@ -66,7 +100,7 @@ jobs:
           PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD: 1
         run: jlpm install
 
-      - uses: jupyterlab/maintainer-tools/.github/actions/update-snapshots@main
+      - uses: jupyterlab/maintainer-tools/.github/actions/update-snapshots@v1
         with:
           npm_client: jlpm
           github_token: ${{ secrets.GITHUB_TOKEN }}