Jenkins pipeline : using variable created in shell 1, in shell 2 - shell

Question

In my pipeline I've 2 stages, and they both call a different shell script (the way they're called is some custom code as we have different pipelines interacting with each other) :
stage('first') {
steps {
script {
stageErrors.add(launchPortalStep.launchStepWithVerification('shell',"chmod +x ./script1.sh && ./script1.sh"))
}
}
}
stage('second') {
steps {
script {
stageErrors.add(launchPortalStep.launchStepWithVerification('shell',"chmod +x ./script2.sh && ./script2.sh"))
}
}
}
The thing is, in script2 I need to use a variable that is set in script1, the only ways I've think of that could work would mean pretty much rewriting everything and that's not a possibility.
Script1 must return either 0 or 1, so it's not possible to return the value and stock in an environment variable that would be then passed as a parameter in script2.
Scripts are also way too long to have them entirely in the pipeline using sh commands (that would be adding at least 700 lines).
What can I do ?

Answer 1

You should use a properties file (it can be even a temp file) to pass the needed variables between the stages.
You should write the needed variables into a properties file (in VAR=VAL format) in the shell script which is called in First step (sh 'echo "MY_ENV_VAR=test_var" > test.prop').
You should read the properties file in the Second step with the readProperties function which is part of the Pipeline Utility Steps plugin def props = readProperties file: 'test.pro). Then set the needed variables as environment variables (env.MY_ENV_VAR = props.MY_ENV_VAR) so you will be able to use the variables in your second shell script as environment variables (sh 'echo MY_ENV_VAR = ${MY_ENV_VAR}').
Complete example code:
pipeline {
agent { label 'MISC' }
stages{
stage('First'){
steps {
sh 'echo "MY_ENV_VAR=test_var" > test.prop'
}
}
stage('Second'){
steps {
script {
// readProperties is a step in Pipeline Utility Steps plugin
def props = readProperties file: 'test.prop'
// Assuming the key name is MY_ENV_VAR in properties file.
env.MY_ENV_VAR = props.MY_ENV_VAR
sh 'echo MY_ENV_VAR = ${MY_ENV_VAR}'
}
}
}
}
}
Output:
[Pipeline] stage
[Pipeline] { (First)
[Pipeline] sh
+ echo MY_ENV_VAR=test_var
[Pipeline] }
[Pipeline] // stage
[Pipeline] stage
[Pipeline] { (Second)
[Pipeline] script
[Pipeline] {
[Pipeline] readProperties
[Pipeline] sh
+ echo MY_ENV_VAR = test_var
MY_ENV_VAR = test_var
[Pipeline] }
[Pipeline] // script
[Pipeline] }
[Pipeline] // stage