如何避免在Jenkinsfile中建立两次以具有不同的图像名称?

Question

在我们的项目中，我们在构建时附加分支名称，除非它是master。我们用build_id和& latest&quot标记它们。这就是我们想要的。

- myapp:latest
- myapp:1
- myapp:2
- myapp:3
- myapp-branch-x:latest
- myapp-branch-x:1
- myapp-branch-x:2
- myapp-branch-x:3
- myapp-branch-y:latest
- myapp-branch-y:1
- myapp-branch-y:2
- myapp-branch-y:3

为了实现这一点，我们在主分支上构建两次。我觉得很奇怪。我们怎样才能避免这种情况呢?

pipeline {
environment {
dockerCredentials = 'myapp-dockerhub'
dockerRegistryUrl = 'https://dockerhub.example.com'
imageName = "dockerhub.example.com/myapp/myapp"
build_id = "${BUILD_ID}"
branch_name = "${BRANCH_NAME.toLowerCase().replace('-$', '')}"
app = ''
}
agent any
stages {
stage('Build') {
steps {
script {
app = docker.build(imageName + '-' + branch_name)
withDockerRegistry(credentialsId: dockerCredentials, url: dockerRegistryUrl) {
app.push(build_id)
app.push('latest')
}
}
}
}
stage('Build-Master') {
when {
branch 'master'
}
steps {
script {
app = docker.build(imageName)
withDockerRegistry(credentialsId: dockerCredentials, url: dockerRegistryUrl) {
app.push(build_id)
app.push('latest')
}
}
}
}
}
}

Answer 1

目前第一阶段针对所有情况执行，第二阶段仅根据when表达式when { branch 'master' }在master分支上执行。您可以向第一阶段添加when表达式，以便仅构建非主分支。那么master分支将不会在两个阶段都执行:

stage('Build') {
when { not { branch 'master' } }
...
}

您可以查看when表达式文档获取更多信息。