How to pass a map to a Jenkins Pipeline global function? - dictionary

Question

I have a global function like this:
def myStep(Closure body) {
def config = [:]
body.resolveStrategy = Closure.DELEGATE_FIRST
body.delegate = config
body()
echo config.name // works
echo config.configure // is null
}
Which is called like this:
myStep {
name = 'linux-build'
configure = [os: 'linux', dir: 'build']
echo "myStep"
}
Normal variables (name) are working but the passed map (configure) does not. Maybe that is because of def config = [:]? How can I access the map inside the function?

Answer 1

The Map is really passed the problem is that echo don't know how to deal with Map in order to print in the console (seems that echo only prints string).
So you can try with the follow code instead:
echo config.configure.toString() // prints [os:linux, dir:build]
Or using GString:
echo "${config.configure}" // prints [os:linux, dir:build]
Or using println:
println config.configure // prints {os=linux, dir=build}
So the thing is that Map is there so you can access config.configure.os or config.configure.dir without problems, try with the follow code in the jenkins-pipeline:
def myStep(Closure body) {
def config = [:]
body.resolveStrategy = Closure.DELEGATE_FIRST
body.delegate = config
body()
echo config.name // works
echo config.configure.os // prints linux
echo config.configure.dir // prints buid
println config.configure // prints {os=linux, dir=build}
}
myStep {
name = 'linux-build'
configure = [os: 'linux', dir: 'build']
echo "myStep"
}
It shows the follow result in the Output console:
[Pipeline] echo
myStep
[Pipeline] echo
linux-build
[Pipeline] echo
linux
[Pipeline] echo
build
[Pipeline] echo
{os=linux, dir=build}
[Pipeline] End of Pipeline
Finished: SUCCESS