set jenkins environment variable in pipeline - jenkins

Question

I am trying to set a Jenkins environment variable where I can get html values and pass it downstream for filtering in parameters stage. I am unable to do so, here we have minimal example
pipeline {
agent any
environment {
get = new URL("http://company_server:port/packages/").openConnection();
getRC = get.getInputStream().getText() // set getRC and access this value for result (highlited with ***********)
}
stages {
stage('Parameters'){
steps {
script {
properties([
parameters([
[$class: 'ChoiceParameter',
choiceType: 'PT_SINGLE_SELECT',
description: '',
name: 'foo',
filterLength: 1,
filterable: true,
script:
[$class: 'GroovyScript',
fallbackScript: [
classpath: [],
sandbox: false,
script: "return['']"
],
script: [
classpath: [],
sandbox: false,
script: '''
def result = (getRC =~ /(">)pip_pkgs[^<]*/).findAll()
def sublist = []
result.each {
sublist.add(it[0].split(",")[0].replace('">', ''))
}
return sublist
'''
]
]
],
])
])
}
}
}
}
}

Answer 1

check here : jenkins environment variables
stages {
stage('Build') {
steps {
echo "Database engine is ${DB_ENGINE}"
echo "DISABLE_AUTH is ${DISABLE_AUTH}"
sh 'printenv'
}
}

Answer 2

When you are using a variable that was set as an environment variable, you have to use like this: ${your_variable} (See Using environment variables)
In your case:
pipeline {
agent any
environment {
get = new URL("http://company_server:port/packages/").openConnection();
getRC = get.getInputStream().getText() // set getRC and access this value for result (highlited with ***********)
}
stages {
stage('Parameters'){
steps {
script {
properties([
parameters([
[$class: 'ChoiceParameter',
choiceType: 'PT_SINGLE_SELECT',
description: '',
name: 'foo',
filterLength: 1,
filterable: true,
script:
[$class: 'GroovyScript',
fallbackScript: [
classpath: [],
sandbox: false,
script: "return['']"
],
script: [
classpath: [],
sandbox: false,
script: '''
def result = (${getRC} =~ /(">)pip_pkgs[^<]*/).findAll()
def sublist = []
result.each {
sublist.add(it[0].split(",")[0].replace('">', ''))
}
return sublist
'''
]
]
],
])
])
}
}
}
}
}