From d8b9d256c22db924374a95334979778b25dc8830 Mon Sep 17 00:00:00 2001
From: Rico Hermans <rix0rrr@gmail.com>
Date: Wed, 6 Nov 2024 12:17:21 +0100
Subject: [PATCH] chore: enable backporting to v2-main (#165)

Fixes #

---------

Signed-off-by: github-actions <github-actions@github.com>
Co-authored-by: github-actions <github-actions@github.com>
---
 .backportrc.json               | 14 ++++++++++++++
 .gitattributes                 |  2 ++
 .github/workflows/backport.yml | 29 +++++++++++++++++++++++++++++
 .gitignore                     |  2 ++
 .npmignore                     |  1 +
 .projen/files.json             |  2 ++
 .projenrc.ts                   |  5 ++++-
 7 files changed, 54 insertions(+), 1 deletion(-)
 create mode 100644 .backportrc.json
 create mode 100644 .github/workflows/backport.yml

diff --git a/.backportrc.json b/.backportrc.json
new file mode 100644
index 0000000..cd58cc9
--- /dev/null
+++ b/.backportrc.json
@@ -0,0 +1,14 @@
+{
+  "commitConflicts": true,
+  "targetPRLabels": [
+    "backport",
+    "auto-approve"
+  ],
+  "backportBranchName": "backport/{{targetBranch}}-{{refValues}}",
+  "prTitle": "{{sourcePullRequest.title}} (backport #{{sourcePullRequest.number}})",
+  "targetBranchChoices": [
+    "main",
+    "v2-main"
+  ],
+  "//": "~~ Generated by projen. To modify, edit .projenrc.ts and run \"npx projen\"."
+}
diff --git a/.gitattributes b/.gitattributes
index 2d423b8..1cda09a 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -2,11 +2,13 @@
 
 * text=auto eol=lf
 *.snap linguist-generated
+/.backportrc.json linguist-generated
 /.eslintrc.json linguist-generated
 /.gitattributes linguist-generated
 /.github/pull_request_template.md linguist-generated
 /.github/workflows/auto-approve.yml linguist-generated
 /.github/workflows/auto-queue.yml linguist-generated
+/.github/workflows/backport.yml linguist-generated
 /.github/workflows/build.yml linguist-generated
 /.github/workflows/pull-request-lint.yml linguist-generated
 /.github/workflows/release-v2-main.yml linguist-generated
diff --git a/.github/workflows/backport.yml b/.github/workflows/backport.yml
new file mode 100644
index 0000000..cc6531e
--- /dev/null
+++ b/.github/workflows/backport.yml
@@ -0,0 +1,29 @@
+# ~~ Generated by projen. To modify, edit .projenrc.ts and run "npx projen".
+
+name: backport
+on:
+  pull_request_target:
+    types:
+      - labeled
+      - unlabeled
+      - closed
+jobs:
+  backport:
+    name: Backport PR
+    runs-on: ubuntu-latest
+    permissions: {}
+    if: github.event.pull_request.merged == true && !(contains(github.event.pull_request.labels.*.name, 'backport'))
+    steps:
+      - name: Check for backport labels
+        id: check_labels
+        run: |-
+          labels='${{ toJSON(github.event.pull_request.labels.*.name) }}'
+          matched=$(echo $labels | jq '.|map(select(startswith("backport-to-"))) | length')
+          echo "matched=$matched"
+          echo "matched=$matched" >> $GITHUB_OUTPUT
+      - name: Backport Action
+        if: fromJSON(steps.check_labels.outputs.matched) > 0
+        uses: sqren/backport-github-action@v9.5.1
+        with:
+          github_token: ${{ secrets.PROJEN_GITHUB_TOKEN }}
+          auto_backport_label_prefix: backport-to-
diff --git a/.gitignore b/.gitignore
index e1649ea..3c8cfae 100644
--- a/.gitignore
+++ b/.gitignore
@@ -57,4 +57,6 @@ junit.xml
 /lib/**/*.d.ts.map
 /dist/
 !/.eslintrc.json
+!/.backportrc.json
+!/.github/workflows/backport.yml
 !/.projenrc.ts
diff --git a/.npmignore b/.npmignore
index 9965643..c235d2f 100644
--- a/.npmignore
+++ b/.npmignore
@@ -22,6 +22,7 @@ tsconfig.tsbuildinfo
 /.eslintrc.json
 *.ts
 !*.d.ts
+.backportrc.json
 /.gitattributes
 /.projenrc.ts
 /projenrc
diff --git a/.projen/files.json b/.projen/files.json
index 1374819..4ff43a5 100644
--- a/.projen/files.json
+++ b/.projen/files.json
@@ -1,10 +1,12 @@
 {
   "files": [
+    ".backportrc.json",
     ".eslintrc.json",
     ".gitattributes",
     ".github/pull_request_template.md",
     ".github/workflows/auto-approve.yml",
     ".github/workflows/auto-queue.yml",
+    ".github/workflows/backport.yml",
     ".github/workflows/build.yml",
     ".github/workflows/pull-request-lint.yml",
     ".github/workflows/release-v2-main.yml",
diff --git a/.projenrc.ts b/.projenrc.ts
index 52af7e7..aeced15 100644
--- a/.projenrc.ts
+++ b/.projenrc.ts
@@ -1,4 +1,4 @@
-import { typescript } from 'projen';
+import { github, typescript } from 'projen';
 const project = new typescript.TypeScriptProject({
   name: 'cdk-assets',
   projenrcTs: true,
@@ -140,4 +140,7 @@ project.eslint?.addRules({
   '@cdklabs/promiseall-no-unbounded-parallelism': ['error'],
 });
 
+// Allow PR backports to all releasable branches
+new github.PullRequestBackport(project);
+
 project.synth();