Jenkins pipeline sh does not seem to respect pipe in shell command

Question

I am using a Jenkinsfile in a pipeline on version 2.32.2.

For various reasons I want to extract the version string from the pom. I was hoping I wouldn\'t have to a

Answer 1

I am also struggling with the usage of pipe inside my jenkins pipeline but as a side note, if you want a simple way to extract the version of a maven pom, here's a very clean one I found in another post and that I'm using :

stage('Preparation') {
 version = getVersion()
 print "version : " + version
}
def getVersion() {
  def matcher = readFile('pom.xml') =~ '<version>(.+)</version>'
  matcher ? matcher[0][1] : null
}

gives you :

[Pipeline] echo
releaseVersion : 0.1.24
[Pipeline] sh

Answer 2

The pipeline-utility-steps plugin nowadays includes a readMavenPom step, which allows to access the version as follows:

version = readMavenPom.getVersion()

Answer 3

So nothing detailed above worked for me using the scripted Jenkinsfile syntax with Groovy. I was able to get it working, however. The type of quotations you use are important. In the example below, I am trying to fetch the latest git tag from GitHub.

...

stage("Get latest git tag") {
  if (env.CHANGE_BRANCH == 'master') {
    sh 'git fetch --tags'
    TAGGED_COMMIT = sh(script: 'git rev-list --branches=master --tags --max-count=1', returnStdout: true).trim()
    LATEST_TAG = sh(script: 'git describe --abbrev=0 --tags ${TAGGED_COMMIT}', returnStdout: true).trim()
    VERSION_NUMBER = sh(script: "echo ${LATEST_TAG} | cut -d 'v' -f 2", returnStdout: true).trim()
    echo "VERSION_NUMBER: ${VERSION_NUMBER}"
    sh 'echo "VERSION_NUMBER: ${VERSION_NUMBER}"'
  }
}
...

Notice how the shell execution to assign LATEST_TAG works as expected (assigning the variable to v2.1.0). If we were to try the same thing (with single quotes) to assign VERSION_NUMBER, it would NOT work - the pipe messes everything up. Instead, we wrap the script in double quotes.

The first echo prints VERSION_NUMBER: 2.1.0 but the second prints VERSION_NUMBER:. If you want VERSION_NUMBER to be available in the shell commands, you have to assign the output of the shell command to env.VERSION_NUMBER as shown below:

...

stage("Get latest git tag") {
  if (env.CHANGE_BRANCH == 'master') {
    sh 'git fetch --tags'
    TAGGED_COMMIT = sh(script: 'git rev-list --branches=master --tags --max-count=1', returnStdout: true).trim()
    LATEST_TAG = sh(script: 'git describe --abbrev=0 --tags ${TAGGED_COMMIT}', returnStdout: true).trim()
    env.VERSION_NUMBER = sh(script: "echo ${LATEST_TAG} | cut -d 'v' -f 2", returnStdout: true).trim()
    echo "VERSION_NUMBER: ${VERSION_NUMBER}"
    sh 'echo "VERSION_NUMBER: ${VERSION_NUMBER}"'
  }
}
...

The first echo prints VERSION_NUMBER: 2.1.0 and the second prints VERSION_NUMBER: 2.1.0.

Answer 4

If your environment allows it, I've found a simple solution to this problem to be to place your script containing pipes into a file, and then run that with sh, like so:

script.sh:

#!/bin/sh
kubectl exec --container bla -i $(kubectl get pods | awk '/foo-/{ print $1 }') -- php /code/dostuff

Jenkinsfile:

stage('Run script with pipes') {
  steps {
    sh "./script.sh"
  }
}

Answer 5

I know this kind of late answer, but whoever you who needs the solution without eval you can use /bin/bash -c "script" to make pipe works

script {
    POM_VERSION = sh(script: "/bin/bash -c 'sed -n \'/<version>/,/<version/p\' pom.xml | head -1 | sed \'s/[[:blank:]]*<\/*version>//g\'\''", returnStdout: true)
    echo "${POM_VERSION}"
}

The only problem with this method is hellish escape yet this way the subshell of pipe will be handled by our boy /bin/bash -c

Answer 6

I finally put some thought into it and realized that pipe subshells are probably causing the issue. I know some of the evils of eval but I ended up wrappping this in an eval:

script {
    def ver_script = $/eval "sed -n '/<version>/,/<version/p' pom.xml | head -1 | sed 's/[[:blank:]]*<\/*version>//g'"/$
    echo "${ver_script}"
    POM_VERSION = sh(script: "${ver_script}", returnStdout: true)
    echo "${POM_VERSION}"
}