From 367ad2f6c9a1f73449bd3f77be248da409cf4096 Mon Sep 17 00:00:00 2001
From: cyqsimon <28627918+cyqsimon@users.noreply.github.com>
Date: Fri, 3 Nov 2023 11:07:19 +0800
Subject: [PATCH 1/3] Added changelog item check

Fetch the base branch and diff correctly

- See: https://github.com/actions/checkout/issues/160

Improve organisation

Add some echo for easier debugging

Fix bad variable syntax

Clarify the double-print in the success case
---
 .../workflows/require-changelog-for-PRs.yml   | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 .github/workflows/require-changelog-for-PRs.yml

diff --git a/.github/workflows/require-changelog-for-PRs.yml b/.github/workflows/require-changelog-for-PRs.yml
new file mode 100644
index 0000000000..0c1c3b6439
--- /dev/null
+++ b/.github/workflows/require-changelog-for-PRs.yml
@@ -0,0 +1,24 @@
+name: Changelog
+
+on:
+  pull_request:
+
+jobs:
+  check-changelog:
+    name: Check for changelog entry
+    runs-on: ubuntu-latest
+    env:
+      PR_SUBMITTER: ${{ github.actor }}
+      PR_NUMBER: ${{ github.event.number }}
+      PR_BASE: ${{ github.base_ref }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Fetch PR base
+        run: git fetch --no-tags --prune --depth=1 origin
+      - name: Search for added line in changelog
+        run: |
+          ADDED=$(git diff -U0 "origin/${PR_BASE}" HEAD -- CHANGELOG.md | grep -P '^\+[^\+].+$')
+          echo "Added lines in CHANGELOG.md:"
+          echo "$ADDED"
+          echo "Grepping for PR info:"
+          grep "#${PR_NUMBER}\\b.*@${PR_SUBMITTER}\\b" <<< "$ADDED"

From 9444dbf1575eb52c0fdde326102d4f2fce3dd945 Mon Sep 17 00:00:00 2001
From: cyqsimon <28627918+cyqsimon@users.noreply.github.com>
Date: Fri, 3 Nov 2023 11:32:21 +0800
Subject: [PATCH 2/3] Write to changelog

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d63e98a9de..d12cb8fe72 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 
 - Upgrade to Rust 2021 edition #2748 (@cyqsimon)
 - Refactor and cleanup build script #2756 (@cyqsimon)
+- Checks changelog has been written to for PRs in CI #2766 (@cyqsimon)
 
 ## Syntaxes
 

From b54c88e1365bd1c521302fb6c1e8b730d27d753c Mon Sep 17 00:00:00 2001
From: cyqsimon <28627918+cyqsimon@users.noreply.github.com>
Date: Fri, 3 Nov 2023 13:52:13 +0800
Subject: [PATCH 3/3] Don't block dependabot PRs

---
 .github/workflows/require-changelog-for-PRs.yml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/.github/workflows/require-changelog-for-PRs.yml b/.github/workflows/require-changelog-for-PRs.yml
index 0c1c3b6439..518fa9d5a1 100644
--- a/.github/workflows/require-changelog-for-PRs.yml
+++ b/.github/workflows/require-changelog-for-PRs.yml
@@ -7,6 +7,8 @@ jobs:
   check-changelog:
     name: Check for changelog entry
     runs-on: ubuntu-latest
+    # dependabot PRs are automerged if CI passes; we shouldn't block these
+    if: github.actor != 'dependabot[bot]'
     env:
       PR_SUBMITTER: ${{ github.actor }}
       PR_NUMBER: ${{ github.event.number }}