I am completely novice at Jenkins, this post Jenkins Plugin:Extended Choice Parameter from JSON file does work for me.
I want to load a list of versions from a json file, which name is input.json, and use this version list as choices of one parameter, named version_list. The input.json file is in my $WORKSPACE, it's content is :
{ "versions":["V1","V2"] } The pipeline script is as follows:
pipeline { agent any stages { stage("load json") { steps { echo "version_list = ${params.version_list}" } } stage("open_json") { steps { script { def prop = readJSON file: "${env.WORKSPACE}/input.json" def version_list = prop.versions println version_list.join(',') } } } } } The parameter version_list is setted as follows:
Extended Choice Paramter
name: versioin_list
Parameter Type: Check Boxes
Choose Source for Value: Groovy Script, and it's content is:
def prop = readJSON file: "${env.WORKSPACE}/input.json" def version_list = prop.versions return version_list.join(',') When I build this job, there is nothing to choice for parameter version_list, but the output shows it can read data from input.json, this is one output:
Started by user admin [Pipeline] Start of Pipeline [Pipeline] node Running on Jenkins in /home/hdl/.jenkins/workspace/json_as_parameter [Pipeline] { [Pipeline] stage [Pipeline] { (load json) [Pipeline] echo version_list = null [Pipeline] } [Pipeline] // stage [Pipeline] stage [Pipeline] { (open_json) [Pipeline] script [Pipeline] { [Pipeline] readJSON [Pipeline] echo "V1","V2" [Pipeline] } [Pipeline] // script [Pipeline] } [Pipeline] // stage [Pipeline] } [Pipeline] // node [Pipeline] End of Pipeline Finished: SUCCESS The load json stage can not get the value of ${params.version_list} but the open_json stage can load json properly.
If is replace groovy script of versison_list simpley as follows:
def version_list = ["V1","V2"] return version_list.join(',') It works well.
I don't know why. Any help, thanks!
