From c6d807e0150cce61e2e94a9b65957d1399c9143f Mon Sep 17 00:00:00 2001
From: Kevin Minehart <5140827+kminehart@users.noreply.github.com>
Date: Wed, 12 Jun 2024 08:48:50 -0500
Subject: [PATCH] CI: Trigger release pr workflow when a release is completed
 (#89062)

---
 .drone.yml                        | 61 ++++++++++++++++++++++++++++++-
 .github/workflows/release-pr.yml  |  2 +-
 scripts/drone/events/release.star | 40 ++++++++++++++++++++
 3 files changed, 101 insertions(+), 2 deletions(-)

diff --git a/.drone.yml b/.drone.yml
index 6b412b6e277..658e2d4adde 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -2731,6 +2731,47 @@ volumes:
 clone:
   retries: 3
 depends_on: []
+image_pull_secrets:
+- gcr
+- gar
+kind: pipeline
+name: create-release-pr
+node:
+  type: no-parallel
+platform:
+  arch: amd64
+  os: linux
+services: []
+steps:
+- commands:
+  - apk add perl
+  - v_target=`echo $${TAG} | perl -pe 's/^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$/v\1.\2.x/'`
+  - default_target=`if [[ -n $$LATEST ]]; then echo 'main'; else echo $$v_target;
+    fi`
+  - backport=`if [[ -n $$LATEST ]]; then echo $$v_target; fi`
+  - curl -L $${GH_CLI_URL} | tar -xz --strip-components=1 -C /usr
+  - gh workflow run -f dry_run=$${DRY_RUN} -f version=$${TAG} -f target=$${TARGET:-$default_target}
+    -f backport=$${BACKPORT:-$default_backport} --repo=grafana/grafana release-pr.yml
+  depends_on: []
+  environment:
+    GH_CLI_URL: https://github.com/cli/cli/releases/download/v2.50.0/gh_2.50.0_linux_amd64.tar.gz
+    GITHUB_TOKEN:
+      from_secret: github_token
+  image: byrnedo/alpine-curl:0.1.8
+  name: create-release-pr
+trigger:
+  event:
+  - promote
+  target: release-pr
+type: docker
+volumes:
+- host:
+    path: /var/run/docker.sock
+  name: docker
+---
+clone:
+  retries: 3
+depends_on: []
 environment:
   EDITION: oss
 image_pull_secrets:
@@ -2787,6 +2828,24 @@ steps:
       from_secret: prerelease_bucket
   image: grafana/grafana-ci-deploy:1.3.3
   name: publish-storybook
+- commands:
+  - apk add perl
+  - v_target=`echo $${TAG} | perl -pe 's/^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$/v\1.\2.x/'`
+  - default_target=`if [[ -n $$LATEST ]]; then echo 'main'; else echo $$v_target;
+    fi`
+  - backport=`if [[ -n $$LATEST ]]; then echo $$v_target; fi`
+  - curl -L $${GH_CLI_URL} | tar -xz --strip-components=1 -C /usr
+  - gh workflow run -f dry_run=$${DRY_RUN} -f version=$${TAG} -f target=$${TARGET:-$default_target}
+    -f backport=$${BACKPORT:-$default_backport} --repo=grafana/grafana release-pr.yml
+  depends_on:
+  - publish-artifacts
+  - publish-static-assets
+  environment:
+    GH_CLI_URL: https://github.com/cli/cli/releases/download/v2.50.0/gh_2.50.0_linux_amd64.tar.gz
+    GITHUB_TOKEN:
+      from_secret: github_token
+  image: byrnedo/alpine-curl:0.1.8
+  name: create-release-pr
 trigger:
   event:
   - promote
@@ -4893,6 +4952,6 @@ kind: secret
 name: gcr_credentials
 ---
 kind: signature
-hmac: 08f38b820f97302de03a9fdfd39fb12c185bb36170704cf7591c16f33c3e4d31
+hmac: 043028c50d984e1ea98a294c6746df1388cb0b7d7976f82f3dd0004fc493bafc
 
 ...
diff --git a/.github/workflows/release-pr.yml b/.github/workflows/release-pr.yml
index e788e1a19dd..6373612eca6 100644
--- a/.github/workflows/release-pr.yml
+++ b/.github/workflows/release-pr.yml
@@ -57,6 +57,6 @@ jobs:
       - name: Create PR with backports
         if: "${{ github.event.inputs.backport != '' }}"
         run: >
-          gh pr create -l "backport-${{ inputs.backport }}" --dry-run=${{ inputs.dry_run }} -H "release/${{ inputs.version }}" -B "${{ inputs.target }}" --title "Release: ${{ inputs.version }}" --body "These code changes must be merged after a release is complete"
+          gh pr create -l "backport ${{ inputs.backport }}" --dry-run=${{ inputs.dry_run }} -H "release/${{ inputs.version }}" -B "${{ inputs.target }}" --title "Release: ${{ inputs.version }}" --body "These code changes must be merged after a release is complete"
         env:
           GH_TOKEN: ${{ steps.generate_token.outputs.token }}
diff --git a/scripts/drone/events/release.star b/scripts/drone/events/release.star
index cdf8c9883c0..404dafa79ca 100644
--- a/scripts/drone/events/release.star
+++ b/scripts/drone/events/release.star
@@ -42,6 +42,7 @@ load(
 )
 
 ver_mode = "release"
+semver_regex = r"^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$"
 
 def retrieve_npm_packages_step():
     return {
@@ -59,6 +60,34 @@ def retrieve_npm_packages_step():
         "commands": ["./bin/build artifacts npm retrieve --tag ${DRONE_TAG}"],
     }
 
+def release_pr_step(depends_on = []):
+    return {
+        "name": "create-release-pr",
+        "image": images["curl"],
+        "depends_on": depends_on,
+        "environment": {
+            "GITHUB_TOKEN": from_secret("github_token"),
+            "GH_CLI_URL": "https://github.com/cli/cli/releases/download/v2.50.0/gh_2.50.0_linux_amd64.tar.gz",
+        },
+        "commands": [
+            "apk add perl",
+            "v_target=`echo $${{TAG}} | perl -pe 's/{}/v\\1.\\2.x/'`".format(semver_regex),
+            "default_target=`if [[ -n $$LATEST ]]; then echo 'main'; else echo $$v_target; fi`",
+            "backport=`if [[ -n $$LATEST ]]; then echo $$v_target; fi`",
+            # Install gh CLI
+            "curl -L $${GH_CLI_URL} | tar -xz --strip-components=1 -C /usr",
+            # Run the release-pr workflow
+            "gh workflow run " +
+            "-f dry_run=$${DRY_RUN} " +
+            "-f version=$${TAG} " +
+            # If the submitter has set a target branch, then use that, otherwise use the default
+            "-f target=$${TARGET:-$default_target} " +
+            # If the submitter has set a backport branch, then use that, otherwise use the default
+            "-f backport=$${BACKPORT:-$default_backport} " +
+            "--repo=grafana/grafana release-pr.yml",
+        ],
+    }
+
 def release_npm_packages_step():
     return {
         "name": "release-npm-packages",
@@ -136,9 +165,20 @@ def publish_artifacts_pipelines(mode):
         publish_artifacts_step(),
         publish_static_assets_step(),
         publish_storybook_step(),
+        release_pr_step(depends_on = ["publish-artifacts", "publish-static-assets"]),
     ]
 
     return [
+        pipeline(
+            name = "create-release-pr",
+            trigger = {
+                "event": ["promote"],
+                "target": "release-pr",
+            },
+            steps = [
+                release_pr_step(),
+            ],
+        ),
         pipeline(
             name = "publish-artifacts-{}".format(mode),
             trigger = trigger,