From 58e7e1dbfaf7547a47e8e53682fac340691a096b Mon Sep 17 00:00:00 2001
From: Rob Young <rob@robyoung.digital>
Date: Tue, 23 Feb 2021 09:20:24 +0000
Subject: [PATCH] Fix PR test workflow for forks

When the workflow is triggered from a fork the permissions for the
`GITHUB_TOKEN` are read-only. This chane skips the write operations if
we're running from a fork.

See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows#pull-request-events-for-forked-repositories
---
 .github/workflows/pull-request-test.yml | 34 ++++++++++++-------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/.github/workflows/pull-request-test.yml b/.github/workflows/pull-request-test.yml
index edf001ccb..3bceaba15 100644
--- a/.github/workflows/pull-request-test.yml
+++ b/.github/workflows/pull-request-test.yml
@@ -20,22 +20,22 @@ jobs:
               issue_number: context.payload.number,
             })
 
-            // Find any comment already made by the bot.
-            const botComment = comments.find(comment => comment.user.id === 41898282)
-            const commentBody = "Hello from actions/github-script! (${{ github.sha }})"
-
-            if (botComment) {
-              await github.issues.updateComment({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                comment_id: botComment.id,
-                body: commentBody
-              })
+            if (context.payload.pull_request.head.repo.full_name !== 'actions/github-script') {
+              console.log('Not attempting to write comment on PR from fork');
             } else {
-              await github.issues.createComment({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                issue_number: context.payload.number,
-                body: commentBody
-              })
+              if (botComment) {
+                await github.issues.updateComment({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  comment_id: botComment.id,
+                  body: commentBody
+                })
+              } else {
+                await github.issues.createComment({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  issue_number: context.payload.number,
+                  body: commentBody
+                })
+              }
             }