From 82f87687152396a9c42f1528bdad677693f33f4d Mon Sep 17 00:00:00 2001
From: Yuxiang Zhu <yuxzhu@redhat.com>
Date: Nov 13 2018 09:15:40 +0000
Subject: CI/CD: Make a comment on pull-request build failure


Following up #256. Leave a message when a CI build of pull-request
fails.

---

diff --git a/openshift/pipelines/templates/waiverdb-polling-pagure.yaml b/openshift/pipelines/templates/waiverdb-polling-pagure.yaml
index 2c005aa..f0491f7 100644
--- a/openshift/pipelines/templates/waiverdb-polling-pagure.yaml
+++ b/openshift/pipelines/templates/waiverdb-polling-pagure.yaml
@@ -238,6 +238,7 @@ objects:
                           return !(it.object().status.phase in ["New", "Pending"])
                         }
                         def devBuildInfo = devBuild.object()
+                        env.DEV_BUILD_NAME = devBuildInfo.metadata.name
                         env.DEV_BUILD_URL = devBuildInfo.metadata.annotations['openshift.io/jenkins-build-uri'] ?: env.BUILD_URL
                         if (env.PAGURE_POLLING_FOR_PR == 'true') {
                           // setting PR status to Pending
@@ -261,7 +262,7 @@ objects:
             post {
               success {
                 script {
-                  // updating Pagure PR flag
+                  // updating Pagure PR flag and make a comment
                   if (env.PAGURE_POLLING_FOR_PR == 'true' && "${PAGURE_API_KEY_SECRET_NAME}") {
                     try {
                       setBuildStatusOnPagurePR(100, 'Build passed.')
@@ -290,6 +291,17 @@ objects:
                     } catch (e) {
                       echo "Error updating PR #${env.PR_NO} status to FAILURE: ${e}"
                     }
+                    if (env.DEV_BUILD_NAME) {
+                      try {
+                        commentOnPR("""
+                        Build ${env.GIT_COMMIT} [FAILED](${env.DEV_BUILD_URL})!
+                        Rebase or make new commits to rebuild.
+                        """.stripIndent())
+                        echo "Comment made."
+                      } catch (e) {
+                        echo "Error making a comment on PR #${env.PR_NO}: ${e}"
+                      }
+                    }
                   }
                   // sending email
                   if ("${MAIL_ENABLED}" == 'true'){
@@ -348,6 +360,13 @@ objects:
               ])
               return steps.readJSON(text: response.content)
             }
+            def commentOnPR(Map args) {
+              def apiPath = "${args.fork?'fork/':''}${args.repo}/pull-request/${args.pr}/comment"
+              def response = callApi('POST', apiPath, [
+                'comment': args.comment,
+              ])
+              return steps.readJSON(text: response.content)
+            }
           }
           def getPagurePRInfo() {
             def pagureClient = new PagureClient (pagureApiUrl: env.PAGURE_API, steps: steps)
@@ -357,11 +376,19 @@ objects:
             withCredentials([string(credentialsId: "${env.PIPELINE_NAMESPACE}-${PAGURE_API_KEY_SECRET_NAME}", variable: 'TOKEN')]) {
               def pagureClient = new PagureClient (pagureApiUrl: env.PAGURE_API, token: env.TOKEN, steps: steps)
               pagureClient.updatePRStatus(
-                username: 'c3i-jenkins', uid: 'ci-pre-merge', url: env.DEV_BUILD_URL,
+                username: 'c3i-jenkins', uid: 'ci-pre-merge', url: env.DEV_BUILD_URL?:env.BUILD_URL,
                 percent: percent, comment: comment, pr: env.PR_NO,
                 repo: "${PAGURE_REPO_NAME}", fork: env.PAGURE_REPO_IS_FORK == 'true')
             }
           }
+          def commentOnPR(String comment) {
+            withCredentials([string(credentialsId: "${env.PIPELINE_NAMESPACE}-${PAGURE_API_KEY_SECRET_NAME}", variable: 'TOKEN')]) {
+              def pagureClient = new PagureClient (pagureApiUrl: env.PAGURE_API, token: env.TOKEN, steps: steps)
+              pagureClient.commentOnPR(
+                comment: comment, pr: env.PR_NO,
+                repo: "${PAGURE_REPO_NAME}", fork: env.PAGURE_REPO_IS_FORK == 'true')
+            }
+          }
           def sendBuildStatusEmail(boolean success) {
             def status = success ? 'passed' : 'failed'
             def reciepent = env.PAGURE_POLLING_FOR_PR != 'true' && ownership.job.ownershipEnabled && ownership.job.primaryOwnerEmail ?