Refactor Image comment workflow to use shared script pattern.

Also refactors away dead crud.
2026-06-05 23:31:24 +00:00 · 2026-05-17 12:54:55 +02:00
parent 39572ebc40
commit f077589c51
3 changed files with 86 additions and 164 deletions
@@ -0,0 +1,80 @@
+// SPDX-FileCopyrightText: 2026 Catalan Lover <catalanlover@protonmail.com>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+/**
+ * @param {Object} args
+ * @param {import('@actions/github').getOctokit} args.github
+ * @param {import('@actions/github').context} args.context
+ * @param {import('@actions/core')} args.core
+ */
+module.exports = async ({ github, context, core }) => {
+  const pullRequest = context.payload.pull_request;
+  if (!pullRequest) {
+    core.notice("No pull_request payload found; skipping.");
+    return;
+  }
+
+  const marker = "<!-- ghcr-pr-image-link -->";
+  const repo = context.repo.repo;
+  const ownerContext = context.repo.owner;
+  const prNumber = pullRequest.number;
+
+  // prOwner is a bit confusingly named it could be argued. Its Head Branch Owner effectively.
+  // It is used to determine the GHCR namespace for the PR build.
+  // In most cases this will be the same as the repo owner,
+  // but in fork scenarios it will be different and we want to ensure the GHCR namespace is correct,
+  // to keep this workflow functional for its intended purpose of providing image refs for PRs independently of origin.
+  const prOwner = pullRequest.head?.repo?.owner?.login || ownerContext;
+  const branch = pullRequest.head?.ref || "";
+  const sha = pullRequest.head?.sha || context.sha;
+  const shortSha = sha.substring(0, 7);
+  const normalizedBranch = branch.replace(/\//g, "-");
+
+  const imageNamespace = `ghcr.io/${prOwner}/${repo}`;
+  const branchTag = normalizedBranch || shortSha;
+  const shaTag = `sha-${shortSha}`;
+
+  const body = [
+    `GHCR image refs for this PR:`,
+    "",
+    `- Namespace: \`${imageNamespace}\``,
+    `- Branch tag: \`${branchTag}\``,
+    `- SHA tag: \`${shaTag}\``,
+    `- Pull: \`docker pull ${imageNamespace}:${branchTag}\``,
+    "",
+    `This comment is generated from PR metadata only. It does not checkout or run PR code. It also does not reflect whether the image has actually been built yet.`,
+    marker,
+  ].join("\n");
+
+  // Update or create comments
+  const comments = await github.rest.issues.listComments({
+    owner: ownerContext,
+    repo,
+    issue_number: prNumber,
+    per_page: 100,
+  });
+
+  const existingComment = comments.data.find(
+    (comment) =>
+      comment.user?.type === "Bot" &&
+      typeof comment.body === "string" &&
+      comment.body.includes(marker)
+  );
+
+  if (existingComment) {
+    await github.rest.issues.updateComment({
+      owner: ownerContext,
+      repo,
+      comment_id: existingComment.id,
+      body,
+    });
+  } else {
+    await github.rest.issues.createComment({
+      owner: ownerContext,
+      repo,
+      issue_number: prNumber,
+      body,
+    });
+  }
+};