Jenkins流水线跨Stage访问变量报错及awk用法咨询

问题场景 #

尝试在Jenkins流水线不同Stage间传递变量：

1. Stage 1生成包含os_type的配置文件
2. Stage 2通过grep+awk解析文件并赋值给全局变量os_type
3. Stage 3输出变量值

原流水线代码：

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}"
        }
    }
}   

报错信息 #

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

错误原因 #

1. Groovy字符串引号冲突：双引号包裹的shell脚本中，嵌套双引号未转义，导致Groovy语法解析失败。
2. 文件覆盖问题：Stage 1中使用>写入文件会覆盖之前的ver=1.3.0行，最终文件仅保留os_type=win。
3. Awk变量被Groovy解析：awk中的$2在Groovy双引号字符串中会被当作Groovy变量解析，无法正确传递给shell。

修复后的代码 #

def os_type
pipeline {
    agent {label 'jenLab'}
    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{         
                    // 用三重单引号包裹shell脚本，避免引号冲突，同时保留shell变量解析
                    os_type = sh(
                        script: '''grep "os_type" ${WORKSPACE}/some_file | awk -F "=" '{print $2}' ''',
                        returnStdout: true,
                    ).trim() // 去除输出中的换行符
                }
            }
        }
        
        stage('stage 3') {
            steps {
                echo "From stage 1 : ${os_type}"
            }
        }
    }
}   

关键调整说明 #

• 引号处理：用三重单引号(''')包裹shell脚本，Groovy不会解析单引号内的内容，避免双引号嵌套冲突，同时${WORKSPACE}仍能被shell正确解析。
• 文件写入方式：将Stage 1中的第二个>改为>>，实现内容追加，保留两行配置。
• 去除换行符：添加.trim()方法，去掉sh返回结果中的换行符，避免输出时出现多余空行。
• 规范语法：补充stages块，符合Jenkins流水线的标准写法。

内容的提问来源于stack exchange，提问作者vinWin