Can we calculate the agent element ?

[Charles Moulliard]

Hi

The following Jenkins pipeline script is not working and we will get as 
error

ERROR
WorkflowScript: 20: Expected string literal @ line 20, column 11.
       agent checkEnvironment()
             ^

WorkflowScript: 20: Only "agent none", "agent any" or "agent {...}" are 
allowed. @ line 20, column 5.
       agent checkEnvironment()

CODE

@Library('snowdrop-lib') _

def checkEnvironment() {
  stage("main") {
    node {
      if (fileExists('/var/run/secrets/kubernetes.io')) {
        AGENT_DEF = """kubernetes {
                            |  defaultContainer 'jnlp'
                            |  yaml 
libraryResource('./podTemplates/multi-containers.yml')
                            |}""".stripMargin()
      } else {
        AGENT_DEF = "label any"
      }
      return AGENT_DEF
    }
  }  
}

pipeline {
    agent checkEnvironment()
    ...

Question: Can we do something like this ? If yes - How ? Example ?

Cheers

Charles

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