Jenkins: Retrieve a variable from json file and use it after -


i have issue on jenkins. make http request , return me json file this:

httprequest authentication: 'b689fe3c-117e-4076-b10d-fe16ab14742f', httpmode: 'post', outputfile: 'merge.json', responsehandle: 'none', url:'http://address:port/prweb/api/v1/branches/testb/merge'   {  "id": "system-queue-merge 50304628545400035ca951969013040610a435733eceae8",  "pxobjclass": "pega-api-ci-branch",  "statusvalue": "ok" }

i want id use in other http request: 

http://address:port/prweb/api/v1/merges/{$id}

i try catch id this: id=$(cat merge.json |grep -o sy.*[a-z] (all json file same)

i try catch id in sh pipe doesn't work, tried define on step, same before. if had solution, it'll great me! continue search , i'll edit if suceed

edit: code of pipe:

pipeline{ agent stages{     stage ('merge branch') {          steps{              httprequest authentication: 'b689fe3c-117e-4076-b10d-fe16ab14742f', httpmode: 'post', outputfile: 'merge.json', responsehandle: 'none', url: 'http://address:port/prweb/api/v1/branches/testb/merge'              httprequest authentication: 'b689fe3c-117e-4076-b10d-fe16ab14742f', httpmode: 'get', outputfile: 'merge3.json', responsehandle: 'none', url: 'http://address:port/prweb/api/v1/merges/'          }     } }

}

that grep doesn't work me. i'm sure working enough messing around.

if install jq, can following:

id="$(cat merge.json | jq -r .id)"  # produces system-queue-merge 50304628545400035ca951969013040610a435733eceae8  # expected echo "$id"

of course when output parsed shell, still need result groovy context in order use httprequest. hot solution avoiding httprequest entirely , using curl 3 requests. :) approach (using external scripts builds) is, perhaps unintuitively, advocated jenkins folks.

if must keep http requests in groovy, here full pipeline answers question:

pipeline {   agent { label 'docker' }   stages {     stage('build') {       steps {         script {           def idfromjson = sh(script: "cat merge.json | jq -r .id", returnstdout: true).trim()            # produces output: idfromjson: system-queue-merge 50304628545400035ca951969013040610a435733eceae8           echo "idfromjson: ${idfromjson}"         }       }     }   } }

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