Script in Jenkins file giving exit code 1 - jenkins

Question

I want to get a line from a file in my workspace. I am using this script :
stage('Test') {
steps {
script {
outputJenkins = 'output-jenkins.log'
sh "cd invoker && mvn clean install && mvn exec:java -Dexec.mainClass=\"com.JenkinsRunner\" -Dexec.args=\"qal ${GIT_COMMIT_HASH}\" > ../${outputJenkins}"
logFile = readFile(outputJenkins)
echo logFile
adminRepoLogLine = sh "echo logFile | grep \"Admin repo url is :::\""
echo adminRepoLogLine
}
}
}
But I am getting this error:
+ echo logFile
+ grep Admin repo url is :::
script returned exit code 1
The script works fine in my shell when I try it locally. Are there any contains around doing it in a JenkinsFile?

Answer 1

If we apply various fixes and improvements to the code in the question to achieve the desired functionality, then it will succeed:
stage('Test') {
steps {
script {
dir('invoker') {
sh(label: 'Maven Clean Install', script: 'mvn clean install')
// assign maven output to variable
String output = sh(label: 'Maven Git Log', script: "mvn exec:java -Dexec.mainClass=\"com.JenkinsRunner\" -Dexec.args=\"qal ${GIT_COMMIT_HASH}\"", returnStdout: true)
}
// assign regex return to variable
def adminRepoLogLine = output =~ /(.*Admin repo url is :::.*)/
// print extracted string from return
print adminRepoLogLine[0][1]
}
}
}
Note that GIT_COMMIT_HASH is neither an intrinsic Jenkins environment variable, nor defined in the pipeline code in the question, so it will need to be defined at Pipeline scope elsewhere in your code.

Answer 2

This is because the string literal logFile does not contain the string Admin repo url is :::. If there's no such match, then grep will exit with status 1.
You probably want to use
cat logFile | grep \"Admin repo url is :::\"
instead, or, even simpler:
grep \"Admin repo url is :::\" logFile
Append || true (or ||:) to the command if you want to avoid the errors when the log line does not appear.