Gradle (w/ groovy) git diff log for kubernetes

git_diff.gradle

ext.gitDiffLog = { String stack, String serviceName, String k8sCluster ->
	new ByteArrayOutputStream().with { out ->
		exec {
			commandLine = envwrapper + ['git', 'describe', '--abbrev=10']
			standardOutput = out
		}
		def toGitRev = out.toString().trim()
		new ByteArrayOutputStream().with { out2 ->
			exec {
				commandLine = envwrapper + ['kubectl', 'get', 'po', '-ojson',
					'--namespace', stack.toLowerCase(), '--context', k8sCluster, '-l', "name=$serviceName"]
				standardOutput = out2
			}

			def raw = out2.toString().trim()

			def fromGitRev = new JsonSlurper().parseText(raw).items.find {
				it?.metadata?.annotations?.monorepo != null
			}.metadata.annotations.monorepo


			def originalGitRev = fromGitRev
			def isCommit = true
			new ByteArrayOutputStream().with { out3 ->
				// Test if the commit in remote is one that we actual recognize.
				// If it is not log is going to spew out all history
				exec {
					commandLine = envwrapper + ['git', "cat-file", "-t", fromGitRev]
					standardOutput = out3
					ignoreExitValue true
				}

				isCommit = out3.toString().trim().equals("commit")

				if (!isCommit) {
					fromGitRev = "HEAD~20"
				}
			}

			// Find commits we are adding to deployment
			def plusCommits = ""
			new ByteArrayOutputStream().with { out3 ->
				exec {
					commandLine = envwrapper + ['git', 'log', "$fromGitRev..$toGitRev", "--date=short", "--pretty=%h | %ad | %an | %s"]
					standardOutput = out3
				}
				def outString = out3.toString().trim()

				outString.eachLine {
					plusCommits += "+ " + it + "\n"
				}
			}

			// Find commits that were on the remote deployment but are not going to be anymore.
			def minusCommits = ""
			new ByteArrayOutputStream().with { out3 ->
				exec {
					commandLine = envwrapper + ['git', 'log', "$toGitRev..$fromGitRev", "--date=short", "--pretty=%h | %ad | %an | %s"]
					standardOutput = out3
				}
				def outString = out3.toString().trim()

				outString.eachLine {
					minusCommits += "- " + it + "\n"
				}
			}

			def silent_git = (System.getenv("SILENT_GIT") ?: "false").toBoolean()

			// If the commits exist on different branches then we will get different values for each going from the parent node.
			// The plus commits are commits that are being added to the deployment, and the minus commits are commits that will no longer be present
			def logResult = plusCommits + minusCommits
			if (!isCommit) {
				logResult = "Original Commit is bad with Hash: $originalGitRev. Instead showing past 20 commits \n" + logResult
			}

			if (!silent_git) {
				println("Git log for $fromGitRev..$toGitRev: \n$logResult")
			}
			return logResult
		}
	}
}

For this line:

def fromGitRev = new JsonSlurper().parseText(raw).items.find {
  it?.metadata?.annotations?.monorepo != null
}.metadata.annotations.monorepo

We annotate all of our pods with monorepo that contains the git sha.