From 59ae01ff719e75940312beeeb009d23ba83197a2 Mon Sep 17 00:00:00 2001
From: Rob Bradford <robert.bradford@intel.com>
Date: Wed, 11 Dec 2019 13:55:40 +0000
Subject: [PATCH] ci: Cancel older builders on Jenkins

When a new build is triggered cancel any older builds to conserve
resources.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
---
 Jenkinsfile | 104 +++++++++++++++++++++++++++++++++-------------------
 1 file changed, 67 insertions(+), 37 deletions(-)

diff --git a/Jenkinsfile b/Jenkinsfile
index 4ad125a57..46ac50caf 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -1,46 +1,76 @@
 pipeline{
-	agent { node { label 'bionic' } }
-	options {
-		timeout(time: 1, unit: 'HOURS')
-	}
+	agent none
 	stages {
-		stage ('Checkout') {
-			steps {
-				checkout scm
+		stage ('Master build') {
+			agent { node { label 'master' } }
+			stages {
+				stage('Cancel older builds') {
+					steps {
+						cancelPreviousBuilds()
+					}
+				}
 			}
 		}
-		stage ('Install system packages') {
-			steps {
-				sh "sudo DEBIAN_FRONTEND=noninteractive apt-get install -yq build-essential mtools libssl-dev pkg-config"
-				sh "sudo apt-get install -yq flex bison libelf-dev qemu-utils qemu-system libglib2.0-dev libpixman-1-dev libseccomp-dev socat"
-				sh "sudo snap install docker"
+		stage ('Worker build') {
+			agent { node { label 'bionic' } }
+			options {
+				timeout(time: 1, unit: 'HOURS')
 			}
-		}
-		stage ('Install Rust') {
-			steps {
-				sh "nohup curl https://sh.rustup.rs -sSf | sh -s -- -y"
-			}
-		}
-		stage ('Run Cargo tests') {
-			steps {
-				sh "scripts/run_cargo_tests.sh"
-			}
-		}
-		stage ('Run OpenAPI tests') {
-			steps {
-				sh "scripts/run_openapi_tests.sh"
-			}
-		}
-		stage ('Run unit tests') {
-			steps {
-				sh "scripts/run_unit_tests.sh"
-			}
-		}
-		stage ('Run integration tests') {
-			steps {
-				sh "sudo mount -t tmpfs tmpfs /tmp"
-				sh "scripts/run_integration_tests.sh"
+			stages {
+				stage ('Checkout') {
+					steps {
+						checkout scm
+					}
+				}
+				stage ('Install system packages') {
+					steps {
+						sh "sudo DEBIAN_FRONTEND=noninteractive apt-get install -yq build-essential mtools libssl-dev pkg-config"
+							sh "sudo apt-get install -yq flex bison libelf-dev qemu-utils qemu-system libglib2.0-dev libpixman-1-dev libseccomp-dev socat"
+							sh "sudo snap install docker"
+					}
+				}
+				stage ('Install Rust') {
+					steps {
+						sh "nohup curl https://sh.rustup.rs -sSf | sh -s -- -y"
+					}
+				}
+				stage ('Run Cargo tests') {
+					steps {
+						sh "scripts/run_cargo_tests.sh"
+					}
+				}
+				stage ('Run OpenAPI tests') {
+					steps {
+						sh "scripts/run_openapi_tests.sh"
+					}
+				}
+				stage ('Run unit tests') {
+					steps {
+						sh "scripts/run_unit_tests.sh"
+					}
+				}
+				stage ('Run integration tests') {
+					steps {
+						sh "sudo mount -t tmpfs tmpfs /tmp"
+							sh "scripts/run_integration_tests.sh"
+					}
+				}
 			}
 		}
 	}
 }
+
+def cancelPreviousBuilds() {
+	// Check for other instances of this particular build, cancel any that are older than the current one
+	def jobName = env.JOB_NAME
+		def currentBuildNumber = env.BUILD_NUMBER.toInteger()
+		def currentJob = Jenkins.instance.getItemByFullName(jobName)
+
+		// Loop through all instances of this particular job/branch
+		for (def build : currentJob.builds) {
+			if (build.isBuilding() && (build.number.toInteger() < currentBuildNumber)) {
+				echo "Older build still queued. Sending kill signal to build number: ${build.number}"
+				build.doStop()
+			}
+		}
+}