How to append a text to a file in Jenkinsfile
injecting Jenkins BUILD_ID
I wish to see
version := \"1.0.25\"
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"
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}"
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")