From 693d7b953e952be935d7f81981d1dd5b287c4f0d Mon Sep 17 00:00:00 2001
From: Niels de Vos <ndevos@redhat.com>
Date: Wed, 12 Aug 2020 12:08:40 +0200
Subject: [PATCH] ci: skip containerized-tests for doc-only PRs

Signed-off-by: Niels de Vos <ndevos@redhat.com>
---
 containerized-tests.groovy | 33 +++++++++++++++++++++++++++++----
 scripts/skip-doc-change.sh | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+), 4 deletions(-)
 create mode 100755 scripts/skip-doc-change.sh

diff --git a/containerized-tests.groovy b/containerized-tests.groovy
index f799e7422..acf0ee4c4 100644
--- a/containerized-tests.groovy
+++ b/containerized-tests.groovy
@@ -2,7 +2,11 @@ def cico_retries = 16
 def cico_retry_interval = 60
 def ci_git_repo = 'https://github.com/ceph/ceph-csi'
 def ci_git_branch = 'ci/centos'
+def git_repo = 'https://github.com/ceph/ceph-csi'
 def ref = "master"
+def git_since = 'master'
+def workdir = '/opt/build/go/src/github.com/ceph/ceph-csi'
+def doc_change = 0
 
 node('cico-workspace') {
 
@@ -12,6 +16,29 @@ node('cico-workspace') {
 			changelog: false
 	}
 
+	stage('checkout PR') {
+		if (params.ghprbPullId != null) {
+			ref = "pull/${ghprbPullId}/head"
+		}
+		if (params.ghprbTargetBranch != null) {
+			git_since = "${ghprbTargetBranch}"
+		}
+
+		sh "git clone --depth=1 --branch='${git_since}' '${git_repo}' ~/build/ceph-csi"
+		sh "cd ~/build/ceph-csi && git fetch origin ${ref} && git checkout -b ${ref} FETCH_HEAD"
+	}
+
+	stage('check doc-only change') {
+		doc_change = sh(
+			script: "cd ~/build/ceph-csi && \${OLDPWD}/scripts/skip-doc-change.sh origin/${git_since}",
+			returnStatus: true)
+	}
+	// if doc_change (return value of skip-doc-change.sh is 1, do not run the other stages
+	if (doc_change == 1) {
+		currentBuild.result = 'SUCCESS'
+		return
+	}
+
 	stage('reserve bare-metal machine') {
 		def firstAttempt = true
 		retry(30) {
@@ -30,11 +57,9 @@ node('cico-workspace') {
 
 	try {
 		stage('prepare bare-metal machine') {
-			if (params.ghprbPullId != null) {
-				ref = "pull/${ghprbPullId}/head"
-			}
 			sh 'scp -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no ./prepare.sh root@${CICO_NODE}:'
-			sh "ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no root@${CICO_NODE} ./prepare.sh --workdir=/opt/build/go/src/github.com/ceph/ceph-csi --gitrepo=${ci_git_repo} --ref=${ref}"
+			// TODO: already checked out the PR on the node, scp the contents?
+			sh "ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no root@${CICO_NODE} ./prepare.sh --workdir=${workdir} --gitrepo=${git_repo} --ref=${ref}"
 		}
 		stage('test & build') {
 			parallel test: {
diff --git a/scripts/skip-doc-change.sh b/scripts/skip-doc-change.sh
new file mode 100755
index 000000000..ef6477f1f
--- /dev/null
+++ b/scripts/skip-doc-change.sh
@@ -0,0 +1,38 @@
+#!/bin/bash -e
+#
+
+GIT_SINCE="${1}"
+if [ -z "${GIT_SINCE}" ]; then
+	GIT_SINCE='origin/master'
+fi
+
+CHANGED_FILES=$(git diff --name-only "${GIT_SINCE}")
+
+[[ -z $CHANGED_FILES ]] && exit 1
+
+skip=0
+#files to be skipped
+declare -a FILES=(^docs/ .md$ ^scripts/ LICENSE .mergify.yml .github .gitignore)
+
+function check_file_present() {
+    local file=$1
+    for FILE in "${FILES[@]}"; do
+        if [[ $file =~ $FILE ]]; then
+            if [[ $file =~ (minikube.sh|travis-functest.sh) ]]; then
+                continue
+            fi
+            return 0
+        fi
+    done
+    return 1
+}
+
+for CHANGED_FILE in $CHANGED_FILES; do
+    if ! check_file_present "$CHANGED_FILE"; then
+        skip=1
+    fi
+done
+if [ $skip -eq 0 ]; then
+    echo "doc change only"
+    exit 1
+fi