From 52b80fbe18520052bf599206e0855fd65b5081f0 Mon Sep 17 00:00:00 2001
From: Kevin Wang <kwangsan@gmail.com>
Date: Wed, 8 Dec 2021 12:53:57 -0500
Subject: [PATCH] feat: updated backport assistant (#1716)

---
 .github/workflows/backport.yml | 68 ++++++++++++++++++++++++----------
 1 file changed, 48 insertions(+), 20 deletions(-)

diff --git a/.github/workflows/backport.yml b/.github/workflows/backport.yml
index ddf5d10b3..620626478 100644
--- a/.github/workflows/backport.yml
+++ b/.github/workflows/backport.yml
@@ -1,21 +1,49 @@
 ---
-  name: Backport Assistant Runner
-  
-  on:
-    pull_request_target:
-      types:
-        - closed
-  
-  jobs:
-    backport:
-      if: github.event.pull_request.merged
-      runs-on: ubuntu-latest
-      container: hashicorpdev/backport-assistant:0.2.1
-      steps:
-        - name: Run Backport Assistant
-          run: |
-            backport-assistant backport -automerge
-          env:
-            BACKPORT_LABEL_REGEXP: "(?P<target>website)/cherrypick"
-            BACKPORT_TARGET_TEMPLATE: "stable-{{.target}}"
-            GITHUB_TOKEN: ${{ secrets.ELEVATED_GITHUB_TOKEN }}
\ No newline at end of file
+name: Backport Assistant Runner
+
+on:
+  pull_request_target:
+    types:
+      - closed
+      - labeled
+
+jobs:
+  backport:
+    if: github.event.pull_request.merged
+    runs-on: ubuntu-latest
+    container: hashicorpdev/backport-assistant:0.2.3
+    steps:
+      - name: Backport changes to stable-website
+        run: |
+          backport-assistant backport -automerge
+        env:
+          BACKPORT_LABEL_REGEXP: "backport/(?P<target>website)"
+          BACKPORT_TARGET_TEMPLATE: "stable-{{.target}}"
+          GITHUB_TOKEN: ${{ secrets.ELEVATED_GITHUB_TOKEN }}
+      - name: Backport changes to latest release branch
+        run: |
+          resp=$(curl -f -s "https://api.github.com/repos/$GITHUB_REPOSITORY/labels?per_page=100")
+          ret="$?"
+          if [[ "$ret" -ne 0 ]]; then
+              echo "The GitHub API returned $ret"
+              exit $ret
+          fi
+
+          # get the latest backport label excluding any website labels, ex: `backport/0.3.x` and not `backport/website`
+          latest_backport_label=$(echo "$resp" | jq -r '.[] | select(.name | (startswith("backport/") and (contains("website") | not))) | .name' | sort -rV | head -n1)
+          echo "Latest backport label: $latest_backport_label"
+
+          # set BACKPORT_TARGET_TEMPLATE for backport-assistant
+          # trims backport/ from the beginning with parameter substitution
+          export BACKPORT_TARGET_TEMPLATE="release/${latest_backport_label#backport/}"
+          backport-assistant backport -automerge
+        env:
+          BACKPORT_LABEL_REGEXP: "backport/(?P<target>website)"
+          GITHUB_TOKEN: ${{ secrets.ELEVATED_GITHUB_TOKEN }}
+      - name: Backport changes to targeted release branch
+        run: |
+          backport-assistant backport -automerge
+        env:
+          BACKPORT_LABEL_REGEXP: "backport/(?P<target>\\d+\\.\\d+\\.\\w+)"
+          BACKPORT_TARGET_TEMPLATE: "release/{{.target}}"
+          GITHUB_TOKEN: ${{ secrets.ELEVATED_GITHUB_TOKEN }}