How to append a text to a file in jenkinsfile

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清酒与你
清酒与你 2021-02-19 02:43

How to append a text to a file in Jenkinsfile injecting Jenkins BUILD_ID

I wish to see

version := \"1.0.25\"

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  • 2021-02-19 03:19

    env.BUILD_ID is a groovy variable, not a shell variable. Since you used single-quotes (') groovy will not substitute the variables in your string and the shell doesn't know about ${env.BUILD_ID}. You need to either use double-quotes " and let groovy do the substitution

    sh "echo version := 1.0.${env.BUILD_ID} >> build.sbt"
    

    or use the variable the shell knows

    sh 'echo version := 1.0.$BUILD_ID >> build.sbt'
    

    and since you need the version surrounded with doublequotes, you'd need something like this:

    sh "echo version := \\\"1.0.${env.BUILD_ID}\\\" >> build.sbt"
    
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  • 2021-02-19 03:26

    The pipeline built in writeFile is also very useful here but requires a read+write process to append to a file.

    def readContent = readFile 'build.sbt'
    writeFile file: 'build.sbt', text: readContent+"\r\nversion := 1.0.${env.BUILD_ID}"
    
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  • 2021-02-19 03:29

    I've used dirty little wrapper function to implement Stefan Crain's answer above:

    def appendFile(String fileName, String line) {
        def current = ""
        if (fileExists(fileName)) {
            current = readFile fileName
        }
        writeFile file: fileName, text: current + "\n" + line
    }
    

    I really don't like it, but it does the trick and it gets round escaping quotes via slashy strings,e.g.:

    def tempFile = '/tmp/temp.txt'
    writeFile file: tempFile, text: "worthless line 1\n"
    // now append the string 'version="1.2.3"  # added by appendFile\n' to tempFile
    appendFile(tempFile,/version="1.2.3" # added by appendFile/ + "\n")
    
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