From 0fdba0af76d5c11cd2d7a2131d7b150a4c231a7c Mon Sep 17 00:00:00 2001
From: Johan Haals <johan.haals@gmail.com>
Date: Fri, 4 Feb 2022 16:00:39 +0100
Subject: [PATCH] actions: Comment information about DCO signing when failing

Signed-off-by: Johan Haals <johan.haals@gmail.com>
---
 .github/workflows/verify_dco.yaml | 60 +++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 .github/workflows/verify_dco.yaml

diff --git a/.github/workflows/verify_dco.yaml b/.github/workflows/verify_dco.yaml
new file mode 100644
index 0000000000..8d071afd4c
--- /dev/null
+++ b/.github/workflows/verify_dco.yaml
@@ -0,0 +1,60 @@
+name: Verify DCO
+on:
+  schedule:
+    - cron:  '*/15 * * * *'
+
+jobs:
+  dco-helper:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Verify DCO status for open pull requests
+        uses: actions/github-script@v5
+        with:
+          script: |
+            const owner = "backstage";
+            const repo = "backstage";
+            const pulls = await github.paginate(github.rest.pulls.list, {
+              state: "open",
+              owner,
+              repo,
+            });
+
+            for (const pull of pulls) {
+              // Pick out the PRs that have the DCO check
+              const checks = await github.rest.checks.listForRef({
+                owner,
+                repo,
+                ref: pull.head.sha,
+                check_name: "DCO",
+                status: "completed",
+              });
+              // Skip if there are no checks
+              if (!checks.data.check_runs.length) {
+                continue;
+              }
+              // Skip if the conclusion is not action_required
+              if (checks.data.check_runs[0].conclusion !== "action_required") {
+                console.log(`No checks found for PR #${pull.number}, skipping`);
+                continue;
+              }
+
+              const comments = await github.paginate(github.rest.issues.listComments, {
+                owner,
+                repo,
+                issue_number: pull.number,
+              });
+
+              if (comments.find((c) => c.user.login === "github-actions[bot]")) {
+                console.log(`already commented on PR #${pull.number}, skipping`);
+                continue;
+              }
+
+              console.log(`creating comment on PR #${pull.number}`);
+              const body = `Thanks for the contribution!\nAll commits need to be DCO signed before merging. Please refer to the the DCO section in [CONTRIBUTING.md](https://github.com/backstage/backstage/blob/master/CONTRIBUTING.md#developer-certificate-of-origin) or the [DCO](${checks.data.check_runs[0].html_url}) status for more info.`;
+              await github.rest.issues.createComment({
+                repo,
+                owner,
+                issue_number: pull.number,
+                body,
+              });
+            }