Jenkins - define json using environment variable - json

Question

I am trying to add an environment variable containing a json which needs to give out the deployed branch name like below:
stage('Build files') {
agent { label "${AGENT_NAME}"}
environment {
DEPLOYED_BRANCH = '{\"branch\":\"${env.BRANCH_NAME}\"}'
}
steps { //Do something}
ansiColor('xterm') {
sh """
echo \"${DEPLOYED_BRANCH}\" > deployed_branch.json
"""
}
}
While deploying, I am getting :
"{"branch":"${env.BRANCH_NAME}"}": bad substitution
I've tried a few different options with the single/double quotes but with no success. Any ideas?

Answer 1

you can do it like this, but it will be a JSON string in the deployed_branch.json file (JSON file with a string content)
stage('create a JSON ') {
environment {
SOME_ENV_VARS = '{\"branch\":\"$WORKSPACE\"}'
}
steps {
sh """
echo $SOME_ENV_VARS > deployed_branch.json
"""
}
}
It can be done better way like this:
scripted pipeline
node {
stage('any') {
def myJSON = readJSON text: '{}'
myJSON.branch = "${env.WORKSPACE}" as String
writeJSON file: "${WORKSPACE}/x.json", json: myJSON
}
}
declarative pipeline
pipeline {
agent any;
stages {
stage('create a JSON ') {
steps {
script {
def myJSON = readJSON text: '{}'
myJSON.branch = "${env.WORKSPACE}" as String
writeJSON file: "${WORKSPACE}/x.json", json: myJSON
}
}
}
}
}
Note - it need Jenkins Utility Pluigns