Accessing variable between jenkins pipeline stages

Question

Looking to access variable from prior stage in Jenkins pipeline leading to below error.

Trying to parse through content of file (example format framed in first stage here ).

def os_type
pipeline {
    agent {label 'jenLab'}
        stage('stage 1') {
            steps {
                sh '''
                echo "ver=1.3.0" > ${WORKSPACE}/some_file
                echo "os_type=win" > ${WORKSPACE}/some_file
                '''
        }
    }
    stage('stage 2') {
            steps {
                script{         
                    os_type = sh(
                        script: "grep "os_type" ${WORKSPACE}/some_file | awk -F "=" '{print $2}'",
                        returnStdout: true,
                    )
            }
        }
    }
    
    stage('stage 3') {
            steps {
                echo "From stage 1 : ${os_type}"
        }
    }
}   

Error is as per below. Kindly suggest if awk needs to be run a different way inside script block

Running in Durability level: MAX_SURVIVABILITY
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
WorkflowScript: 16: unexpected token: os_type @ line 16, column 22.
                        script: "grep "os_type" ${WORKSPACE}/some_file | awk -F "=" '{print $2}'",
                        ^

1 error

    at org.codehaus.groovy.control.ErrorCollector.failIfErrors(ErrorCollector.java:310)
    at org.codehaus.groovy.control.ErrorCollector.addFatalError(ErrorCollector.java:150)
    at org.codehaus.groovy.control.ErrorCollector.addError(ErrorCollector.java:120)
    at org.codehaus.groovy.control.ErrorCollector.addError(ErrorCollector.java:132)
    at org.codehaus.groovy.control.SourceUnit.addError(SourceUnit.java:350)
    at org.codehaus.groovy.antlr.AntlrParserPlugin.transformCSTIntoAST(AntlrParserPlugin.java:144)
    at org.codehaus.groovy.antlr.AntlrParserPlugin.parseCST(AntlrParserPlugin.java:110)
    at org.codehaus.groovy.control.SourceUnit.parse(SourceUnit.java:234)
    at org.codehaus.groovy.control.CompilationUnit$1.call(CompilationUnit.java:168)
    at org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits(CompilationUnit.java:943)
    at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:605)
    at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:581)
    at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:558)
    at groovy.lang.GroovyClassLoader.doParseClass(GroovyClassLoader.java:298)
    at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:268)
    at groovy.lang.GroovyShell.parseClass(GroovyShell.java:688)
    at groovy.lang.GroovyShell.parse(GroovyShell.java:700)
    at org.jenkinsci.plugins.workflow.cps.CpsGroovyShell.doParse(CpsGroovyShell.java:142)
    at org.jenkinsci.plugins.workflow.cps.CpsGroovyShell.reparse(CpsGroovyShell.java:127)
    at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.parseScript(CpsFlowExecution.java:561)
    at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.start(CpsFlowExecution.java:522)
    at org.jenkinsci.plugins.workflow.job.WorkflowRun.run(WorkflowRun.java:337)
    at hudson.model.ResourceController.execute(ResourceController.java:97)
    at hudson.model.Executor.run(Executor.java:428)
Finished: FAILURE

Answer 1

You need to escape the special characters in the sh block. Take a look at the below pipeline.

def os_type
pipeline {
    agent any
    stages{
        stage('stage 1') {
            steps {
                sh '''
                echo "ver=1.3.0" > ${WORKSPACE}/some_file
                echo "os_type=win" > ${WORKSPACE}/some_file
                '''
            }
        }
        stage('stage 2') {
                steps {
                    script{         
                        os_type = sh(
                            script: "grep \"os_type\" ${WORKSPACE}/some_file | awk -F \"=\" '{print \$2}'",
                            returnStdout: true,
                        )
                }
            }
        }
        
        stage('stage 3') {
                steps {
                    echo "From stage 1 : ${os_type}"
            }
        }
    }

}