Once you specify a file, you need to restart your Jenkins master or slave if you mean "Prepare an environment for the run" from their configuration. Have you tried it?

oleg_nenashev,

Thanks for the comment!

Restarted and checked, It did't worked. However ,I am just wondering how Jenkins restart is related to this. Also, I am executing echo "BRANCHNAME=TEST" > /tmp/tagNames.properties in Script Content (under Prepare an environment for the run), even this is not working. The file is not getting created at all..

Whatever I am trying here, when I try the same in Freestyle job, it works perfectly.. I need not do restart or anything....

Am I missing anything here??

Doesn't work for me either.

The solution for now is to use readProperties function (using 'Pipeline Utility Steps' plugins):

def props = readProperties file: '/tmp/tagNames.properties'

And transfer it to the current node context:

@NonCPS
def mapToList(depmap) {
    def dlist = []
    for (entry in depmap) {
        dlist.add([entry.key, entry.value])
    }
    dlist
}

node {
   def props = readProperties file: '/tmp/tagNames.properties'
   def envList = []
   for (it2 in mapToList(props)) {
        def key = it2[0]
        def val = it2[1]
        envList << key + "=" + val
    }
    withEnv(envList) {
        sh 'echo "${BRANCHNAME}"'
    }
}

Converting it to RFE since EnvInject does not support Pipeline now (and does not claim to do so)

Created an EPIC for it

You should not use EnvInject for this purpose to begin with. readFile or if necessary use the Pipeline Utility Steps plugin to load a properties file.

Reducing priority to reflect that there's a way to do this and the impact is now smaller.

This is a global configuration setup:

My properties file looks like this:
/secret/secrets.properties

VERSION = 12

I can 100% ensure there is a this file in my slave node that is managed by the Kubernetes plugin, which means, every trigger will start an entirely new slave node in place

Here's how my Jenkinsfile looks like:

pipeline {
    stages {
        stage("Hello") {
            steps {
                sh '''
                    pwd
                    echo "Hello World"
                    ls /secret
                    echo "The latest version is: ${VERSION}"
                '''
            }
        }
    }
}

conclusion: !!!! the output is nothing !!!