Re: Can't capture command results in Kubernetes Pipeline Jenkinsfile

[Mark Nuttall]

In case anyone else finds this topic, the key link 
is https://jenkins.io/doc/book/pipeline/jenkinsfile/

"Only the [double quoted form] will support the dollar-sign ($) based 
string interpolation"

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Re: Can't capture command results in Kubernetes Pipeline Jenkinsfile

[Mark Nuttall]

Having asked the question I've now stumbled onto the answer: I'm just not 
printing the result correctly. The correct syntax to print variables is, 

echo "c = ${c}"


It needs to be double quotes and not single quotes in order for the 
variable substitution to work.  

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Can't capture command results in Kubernetes Pipeline Jenkinsfile

[Mark Nuttall]

Hello, 
I'm porting an existing Jenkinsfile to use the kubernetes plugin and its 
syntax. I've hit a problem in which I need to get the result of a shell 
command, but get only empty strings. This code worked correctly until being 
ported to the kubernetes plugin syntax. 

Here's my Jenkinsfile, showing a simple command just to help explain the 
problem:

#!groovy

podTemplate(
  label: 'mypod',
  containers: [containerTemplate(name: 'maven', image: 'maven:3.5.0-jdk-8', 
ttyEnabled: true, command: 'cat')],
){
  node('mypod') {
stage ('build') {
  container ('maven') {
sh 'ls > out.txt'
sh 'cat out.txt'

def c = sh(script: 'cat out.txt', returnStdout: true).trim();
sh 'echo c = ${c}'


def c2 = readFile('out.txt').trim()
sh 'echo c2 = ${c2}'
  }
}
  }
}

The relevant output, below, is very long but it shows that the 'ls' command 
runs successfully, and that I can cat the result of that file: but I am 
completely unable to read the file into a variable, or to execute the 
command and store the result as a variable, which is what I really want to 
do. I've highlighted the relevant sections in yellow. Please help me, I'm 
getting desperate :-(

Many thanks,

-- Mark

# # + ls

[Pipeline] sh[sample.microservicebuilder.test] Running shell script
Executing shell script inside container [maven] of pod 
[kubernetes-991f3f512a3e4c13aa5c7960410311bb-25c6ad58b93c]
Executing command: sh -c echo $$ > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-e505a1a7/pid';
 jsc=durable-85fd500743f4a1b75ec1fa7e5bc276e5; JENKINS_SERVER_COOKIE=$jsc 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-e505a1a7/script.sh'
 > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-e505a1a7/jenkins-log.txt'
 2>&1; echo $? > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-e505a1a7/jenkins-result.txt'
 
# cd "/home/jenkins/workspace/sample.microservicebuilder.test"
sh -c echo $$ > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-e505a1a7/pid';
 jsc=durable-85fd500743f4a1b75ec1fa7e5bc276e5; JENKINS_SERVER_COOKIE=$jsc 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-e505a1a7/script.sh'
 > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-e505a1a7/jenkins-log.txt'
 2>&1; echo $? > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-e505a1a7/jenkins-result.txt'
 
exit*# # + cat out.txt
Dockerfile
Jenkinsfile
README.md
manifests
out.txt
pom.xml
server.xml
src*[Pipeline] sh[sample.microservicebuilder.test] Running shell script
Executing shell script inside container [maven] of pod 
[kubernetes-991f3f512a3e4c13aa5c7960410311bb-25c6ad58b93c]
Executing command: sh -c echo $$ > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-9af67ea2/pid';
 jsc=durable-85fd500743f4a1b75ec1fa7e5bc276e5; JENKINS_SERVER_COOKIE=$jsc 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-9af67ea2/script.sh'
 > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-9af67ea2/output.txt'
 2> 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-9af67ea2/jenkins-log.txt';
 echo $? > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-9af67ea2/jenkins-result.txt'
 

# cd "/home/jenkins/workspace/sample.microservicebuilder.test"
sh -c echo $$ > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-9af67ea2/pid';
 jsc=durable-85fd500743f4a1b75ec1fa7e5bc276e5; JENKINS_SERVER_COOKIE=$jsc 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-9af67ea2/script.sh'
 > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-9af67ea2/output.txt'
 2> 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-9af67ea2/jenkins-log.txt';
 echo $? > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-9af67ea2/jenkins-result.txt'
 
exit
# # + cat out.txt[Pipeline] sh[sample.microservicebuilder.test] Running shell 
script
Executing shell script inside container [maven] of pod 
[kubernetes-991f3f512a3e4c13aa5c7960410311bb-25c6ad58b93c]
Executing command: sh -c echo $$ > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-3fd54a06/pid';
 jsc=durable-85fd500743f4a1b75ec1fa7e5bc276e5; JENKINS_SERVER_COOKIE=$jsc 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-3fd54a06/script.sh'
 > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-3fd54a06/jenkins-log.txt'
 2>&1; echo $? > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-3fd54a06/jenkins-result.txt'
 
# cd "/home/jenkins/workspace/sample.microservicebuilder.test"
sh -c echo $$ > 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/durable-3fd54a06/pid';
 jsc=durable-85fd500743f4a1b75ec1fa7e5bc276e5; JENKINS_SERVER_COOKIE=$jsc 
'/home/jenkins/workspace/sample.microservicebuilder.test@tmp/