DEVOPS技术实践_23：判断文件下载成功作为执行条件

时间：2023-03-09 16:32:44
DEVOPS技术实践_23：判断文件下载成功作为执行条件

在实际生产中，我们经常会需要通过判断一个结果作为一个条件去执行另一个内容，比如判断一个文件是否存在，判官一个命令是否执行成功等等

现在我们选择其中一个场景进行实验，当某个目录下存在，则执行操作

1. 下载一个文件

[root@node1 ~]# cd /opt/

[root@node1 opt]# wget https://www.python.org/ftp/python/3.7.1/Python-3.7.1.tgz

[root@node1 opt]# ll

-rw-r--r-- 1 root root 22802018 Oct 20  2018 Python-3.7.1.tgz

就判断这个文件是否存在

2 Jenkinsfile文件

import hudson.model.*;

println env.JOB_NAME

println env.BUILD_NUMBER

pipeline{

    agent any

    stages{

        stage("git checkout") {

            steps{

                script {

                checkout([$class: 'GitSCM',

                branches: [[name: '*/master']],

                doGenerateSubmoduleConfigurations: false,

                extensions: [],

                submoduleCfg: [],

                userRemoteConfigs: [[credentialsId: 'e3e48ed7-dbce-4642-bb18-28e0c71ab962',

                url: 'http://192.168.132.132/root/hello-world-greeting.git']]])

                }

            }

        }

        stage("Check file download") {

            steps {

                script {

                    out = sh(script: "ls /opt ", returnStdout: true).toString().trim()

                        println out

                        if(out.contains("Python-3.7.1.tgz")) {

                            println "file download successfully."

                        }else {

                            sh("exit 1")

                        }

                    }

                }

            }

        }

    }

把linux执行打印结果存在一个字符串中，通过字符串包含的方法去判断文件是否存在。这个思路有时候很好用，字符串操作在编程过程中经常被使用到。

3 构建执行

DEVOPS技术实践_23：判断文件下载成功作为执行条件

控制台输出

Started by user darren ning

Obtained pipeline.jenkinsfile from git http://192.168.132.132/root/pipeline-parameter-test.git

Running in Durability level: MAX_SURVIVABILITY

[Pipeline] Start of Pipeline

[Pipeline] echo

pipeline_parameter_project

[Pipeline] echo

127

[Pipeline] node

Running on Jenkins in /root/.jenkins/workspace/pipeline_parameter_project

[Pipeline] {

[Pipeline] stage

[Pipeline] { (Declarative: Checkout SCM)

[Pipeline] checkout

No credentials specified

 > git rev-parse --is-inside-work-tree # timeout=10

Fetching changes from the remote Git repository

 > git config remote.origin.url http://192.168.132.132/root/pipeline-parameter-test.git # timeout=10

Fetching upstream changes from http://192.168.132.132/root/pipeline-parameter-test.git

 > git --version # timeout=10

 > git fetch --tags --progress http://192.168.132.132/root/pipeline-parameter-test.git +refs/heads/*:refs/remotes/origin/*

 > git rev-parse refs/remotes/origin/master^{commit} # timeout=10

 > git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10

Checking out Revision 62425dd2e7881670ddad0294e22aa9a2427eb835 (refs/remotes/origin/master)

 > git config core.sparsecheckout # timeout=10

 > git checkout -f 62425dd2e7881670ddad0294e22aa9a2427eb835

Commit message: "Update pipeline.jenkinsfile"

 > git rev-list --no-walk 35d435ba12df03fb7b7c9b302a59511a19141c42 # timeout=10

[Pipeline] }

[Pipeline] // stage

[Pipeline] withEnv

[Pipeline] {

[Pipeline] stage

[Pipeline] { (git checkout)

[Pipeline] script

[Pipeline] {

[Pipeline] checkout

using credential e3e48ed7-dbce-4642-bb18-28e0c71ab962

 > git rev-parse --is-inside-work-tree # timeout=10

Fetching changes from the remote Git repository

 > git config remote.origin.url http://192.168.132.132/root/hello-world-greeting.git # timeout=10

Fetching upstream changes from http://192.168.132.132/root/hello-world-greeting.git

 > git --version # timeout=10

using GIT_ASKPASS to set credentials

 > git fetch --tags --progress http://192.168.132.132/root/hello-world-greeting.git +refs/heads/*:refs/remotes/origin/*

 > git rev-parse refs/remotes/origin/master^{commit} # timeout=10

 > git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10

Checking out Revision 50eaa401672536f50add4ba0e86d290b8ffafb3c (refs/remotes/origin/master)

 > git config core.sparsecheckout # timeout=10

 > git checkout -f 50eaa401672536f50add4ba0e86d290b8ffafb3c

Commit message: "Update Jenkinsfile"

 > git rev-list --no-walk 50eaa401672536f50add4ba0e86d290b8ffafb3c # timeout=10

[Pipeline] }

[Pipeline] // script

[Pipeline] }

[Pipeline] // stage

[Pipeline] stage

[Pipeline] { (Check file download)

[Pipeline] script

[Pipeline] {

[Pipeline] sh

+ ls /opt

[Pipeline] echo

Python-3.7.1.tgz

[Pipeline] echo

file download successfully.

[Pipeline] }

[Pipeline] // script

[Pipeline] }

[Pipeline] // stage

[Pipeline] }

[Pipeline] // withEnv

[Pipeline] }

[Pipeline] // node

[Pipeline] End of Pipeline

Finished: SUCCESS

4 改进实验

1.添加try catch语句块

2.如果发生错误，就把jenkinsjob标黄

jenkinsfile文件

import hudson.model.*;

println env.JOB_NAME

println env.BUILD_NUMBER

pipeline{

    agent any

    stages{

        stage("git checkout") {

            steps{

                script {

                checkout([$class: 'GitSCM',

                branches: [[name: '*/master']],

                doGenerateSubmoduleConfigurations: false,

                extensions: [],

                submoduleCfg: [],

                userRemoteConfigs: [[credentialsId: 'e3e48ed7-dbce-4642-bb18-28e0c71ab962',

                url: 'http://192.168.132.132/root/hello-world-greeting.git']]])

                }

            }

        }

        stage("Check file download") {

            steps {

                script {

                    try{

                    out = sh(script: "ls /opt ", returnStdout: true).toString().trim()

                        println out

                        if(out.contains("Python-3.7.1.tgz")) {

                            println "file download successfully."

                        }else {

                            sh("exit 1")

                        }

                    }

                    catch(Exception e) {

                        println "e"

                        error("fond error during check file download.")

                    }

                }

            }

        }

    }

}

构建

DEVOPS技术实践_23：判断文件下载成功作为执行条件

控制台输出

Started by user darren ning

Obtained pipeline.jenkinsfile from git http://192.168.132.132/root/pipeline-parameter-test.git

Running in Durability level: MAX_SURVIVABILITY

[Pipeline] Start of Pipeline

[Pipeline] echo

pipeline_parameter_project

[Pipeline] echo

129

[Pipeline] node

Running on Jenkins in /root/.jenkins/workspace/pipeline_parameter_project

[Pipeline] {

[Pipeline] stage

[Pipeline] { (Declarative: Checkout SCM)

[Pipeline] checkout

No credentials specified

 > git rev-parse --is-inside-work-tree # timeout=10

Fetching changes from the remote Git repository

 > git config remote.origin.url http://192.168.132.132/root/pipeline-parameter-test.git # timeout=10

Fetching upstream changes from http://192.168.132.132/root/pipeline-parameter-test.git

 > git --version # timeout=10

 > git fetch --tags --progress http://192.168.132.132/root/pipeline-parameter-test.git +refs/heads/*:refs/remotes/origin/*

 > git rev-parse refs/remotes/origin/master^{commit} # timeout=10

 > git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10

Checking out Revision 902f050f4a8d3a83a625f583b87f394d0fbad31f (refs/remotes/origin/master)

 > git config core.sparsecheckout # timeout=10

 > git checkout -f 902f050f4a8d3a83a625f583b87f394d0fbad31f

Commit message: "Update pipeline.jenkinsfile"

 > git rev-list --no-walk 62425dd2e7881670ddad0294e22aa9a2427eb835 # timeout=10

[Pipeline] }

[Pipeline] // stage

[Pipeline] withEnv

[Pipeline] {

[Pipeline] stage

[Pipeline] { (git checkout)

[Pipeline] script

[Pipeline] {

[Pipeline] checkout

using credential e3e48ed7-dbce-4642-bb18-28e0c71ab962

 > git rev-parse --is-inside-work-tree # timeout=10

Fetching changes from the remote Git repository

 > git config remote.origin.url http://192.168.132.132/root/hello-world-greeting.git # timeout=10

Fetching upstream changes from http://192.168.132.132/root/hello-world-greeting.git

 > git --version # timeout=10

using GIT_ASKPASS to set credentials

 > git fetch --tags --progress http://192.168.132.132/root/hello-world-greeting.git +refs/heads/*:refs/remotes/origin/*

 > git rev-parse refs/remotes/origin/master^{commit} # timeout=10

 > git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10

Checking out Revision 50eaa401672536f50add4ba0e86d290b8ffafb3c (refs/remotes/origin/master)

 > git config core.sparsecheckout # timeout=10

 > git checkout -f 50eaa401672536f50add4ba0e86d290b8ffafb3c

Commit message: "Update Jenkinsfile"

 > git rev-list --no-walk 50eaa401672536f50add4ba0e86d290b8ffafb3c # timeout=10

[Pipeline] }

[Pipeline] // script

[Pipeline] }

[Pipeline] // stage

[Pipeline] stage

[Pipeline] { (Check file download)

[Pipeline] script

[Pipeline] {

[Pipeline] sh

+ ls /opt

[Pipeline] echo

Python-3.7.1.tgz

[Pipeline] echo

file download successfully.

[Pipeline] }

[Pipeline] // script

[Pipeline] }

[Pipeline] // stage

[Pipeline] }

[Pipeline] // withEnv

[Pipeline] }

[Pipeline] // node

[Pipeline] End of Pipeline

Finished: SUCCESS

5 尝试失败构建

修改文件的名字

[root@node1 opt]# mv Python-3.7.1.tgz Python-3.7.1.tg

[root@node1 opt]# ll

-rw-r--r-- 1 root root 22802018 Oct 20  2018 Python-3.7.1.tg

再次构建

DEVOPS技术实践_23：判断文件下载成功作为执行条件

Started by user darren ning

Obtained pipeline.jenkinsfile from git http://192.168.132.132/root/pipeline-parameter-test.git

Running in Durability level: MAX_SURVIVABILITY

[Pipeline] Start of Pipeline

[Pipeline] echo

pipeline_parameter_project

[Pipeline] echo

135

[Pipeline] node

Running on Jenkins in /root/.jenkins/workspace/pipeline_parameter_project

[Pipeline] {

[Pipeline] stage

[Pipeline] { (Declarative: Checkout SCM)

[Pipeline] checkout

No credentials specified

 > git rev-parse --is-inside-work-tree # timeout=10

Fetching changes from the remote Git repository

 > git config remote.origin.url http://192.168.132.132/root/pipeline-parameter-test.git # timeout=10

Fetching upstream changes from http://192.168.132.132/root/pipeline-parameter-test.git

 > git --version # timeout=10

 > git fetch --tags --progress http://192.168.132.132/root/pipeline-parameter-test.git +refs/heads/*:refs/remotes/origin/*

 > git rev-parse refs/remotes/origin/master^{commit} # timeout=10

 > git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10

Checking out Revision 34338b984aa9c700e50fdbaf0b2a2a1cc7ba264b (refs/remotes/origin/master)

 > git config core.sparsecheckout # timeout=10

 > git checkout -f 34338b984aa9c700e50fdbaf0b2a2a1cc7ba264b

Commit message: "Update pipeline.jenkinsfile"

 > git rev-list --no-walk 64c00d7ecd3a420314e3950676835d9bb07b0e88 # timeout=10

[Pipeline] }

[Pipeline] // stage

[Pipeline] withEnv

[Pipeline] {

[Pipeline] stage

[Pipeline] { (git checkout)

[Pipeline] script

[Pipeline] {

[Pipeline] checkout

using credential e3e48ed7-dbce-4642-bb18-28e0c71ab962

 > git rev-parse --is-inside-work-tree # timeout=10

Fetching changes from the remote Git repository

 > git config remote.origin.url http://192.168.132.132/root/hello-world-greeting.git # timeout=10

Fetching upstream changes from http://192.168.132.132/root/hello-world-greeting.git

 > git --version # timeout=10

using GIT_ASKPASS to set credentials

 > git fetch --tags --progress http://192.168.132.132/root/hello-world-greeting.git +refs/heads/*:refs/remotes/origin/*

 > git rev-parse refs/remotes/origin/master^{commit} # timeout=10

 > git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10

Checking out Revision 50eaa401672536f50add4ba0e86d290b8ffafb3c (refs/remotes/origin/master)

 > git config core.sparsecheckout # timeout=10

 > git checkout -f 50eaa401672536f50add4ba0e86d290b8ffafb3c

Commit message: "Update Jenkinsfile"

 > git rev-list --no-walk 50eaa401672536f50add4ba0e86d290b8ffafb3c # timeout=10

[Pipeline] }

[Pipeline] // script

[Pipeline] }

[Pipeline] // stage

[Pipeline] stage

[Pipeline] { (Check file download)

[Pipeline] script

[Pipeline] {

[Pipeline] sh

+ ls /opt

[Pipeline] echo

Python-3.7.1.tg

[Pipeline] sh

+ exit 1

[Pipeline] echo

e

[Pipeline] error

[Pipeline] }

[Pipeline] // script

[Pipeline] }

[Pipeline] // stage

[Pipeline] }

[Pipeline] // withEnv

[Pipeline] }

[Pipeline] // node

[Pipeline] End of Pipeline

ERROR: fond error during check file download.

Finished: FAILURE

如果不成功,那么就执行exit 1代码，Linux就退出，这个是一个异常，被catch之后，打印了异常e，并执行了error()方法，error方法在jenkins中是中断运行并标记当前运行job为failed的功能。

参考文献：https://blog.****.net/u011541946/article/details/84945882