Merge pull request #450 from cloudfoundry/remediate-automatic-stemcell-update-race-cond

Make the check stemcell version task generic

Author: iaftab-alam

tasks/check-stemcell-versions-for-ship-it/main.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"log"
+	"os"
+	"path/filepath"
+
+	"github.com/cloudfoundry/runtime-ci/task-libs/bosh"
+)
+
+func main() {
+	if len(os.Args) < 3 {
+		log.Fatalf("Usage: %s <buildDir> <branchToCompare>", os.Args[0])
+	}
+
+	buildDir := os.Args[1]
+	branchToCompare := os.Args[2]
+
+	content, err := os.ReadFile(filepath.Join(buildDir, "cf-deployment-main", "cf-deployment.yml"))
+	if err != nil {
+		log.Fatalf("Failed to read main branch cf-deployment.yml: %s", err)
+	}
+
+	mainManifest, err := bosh.NewManifestFromFile(content)
+	if err != nil {
+		log.Fatalf("Failed to unmarshal main branch cf-deployment.yml: %s", err)
+	}
+
+	content, err = os.ReadFile(filepath.Join(buildDir, "cf-deployment-"+branchToCompare, "cf-deployment.yml"))
+	if err != nil {
+		log.Fatalf("Failed to read %s branch cf-deployment.yml: %s", branchToCompare, err)
+	}
+
+	branchToCompareManifest, err := bosh.NewManifestFromFile(content)
+	if err != nil {
+		log.Fatalf("Failed to unmarshal %s branch cf-deployment.yml: %s", branchToCompare, err)
+	}
+
+	mainStemcell := mainManifest.Stemcells[0]
+	branchToCompareStemcell := branchToCompareManifest.Stemcells[0]
+
+	if mainStemcell.OS != branchToCompareStemcell.OS {
+		log.Printf("%s branch stemcell OS (%s) is different to the main branch stemcell OS (%s). Proceeding.",
+			branchToCompare, branchToCompareStemcell.OS, mainStemcell.OS)
+		os.Exit(0)
+	}
+
+	result, err := branchToCompareStemcell.CompareVersion(mainStemcell)
+	if err != nil {
+		log.Fatalf("Failed to compare stemcell versions: %s", err)
+	}
+
+	if result == -1 {
+		log.Fatalf("%s branch stemcell version (%s) is behind the main branch stemcell version (%s). Aborting.",
+			branchToCompare, branchToCompareStemcell.Version, mainStemcell.Version)
+	}
+
+	log.Printf("%s branch stemcell version (%s) is ahead of, or equal to, the main branch stemcell version (%s). Proceeding.",
+		branchToCompare, branchToCompareStemcell.Version, mainStemcell.Version)
+}

tasks/check-stemcell-versions-for-ship-it/task

@@ -0,0 +1,13 @@
+#!/bin/bash
+set -eu
+
+function main() {
+  root_dir="$PWD"
+  branch_to_compare="${BRANCH_TO_COMPARE:-release-candidate}"
+
+  pushd "$(dirname $0)"
+    go run main.go "${root_dir}" "${branch_to_compare}"
+  popd
+}
+
+main

tasks/check-stemcell-versions/main.go

@@ -8,8 +8,13 @@ image_resource:
 
 inputs:
 - name: runtime-ci
-- name: cf-deployment-release-candidate
 - name: cf-deployment-main
-
+- name: cf-deployment-release-candidate
+  optional: true
+- name: cf-deployment-develop
+  optional: true
+  
+params:
+  BRANCH_TO_COMPARE: release-candidate
 run:
-  path: runtime-ci/tasks/check-stemcell-versions-for-ship-it/task
+  path: runtime-ci/tasks/check-stemcell-versions/task