Jenkins Pipeline: Using Env Var in another Env Var declaration

Question

I would like to make my long "ssh" command reusable as a simple variable throughout my pipeline. To do this, it would be nice to declare my hostname in a var, then use that var in another var declaration to build the final command:

environment { BUILDHOST = 'buildhost.example.com' SSHCMD = 'ssh -o StrictHostKeyChecking=no jenkins@${env.BUILDHOST}' } 

So conceptually in something like this:

pipeline { agent any environment { BUILDHOST = 'buildhost01.example.com' SSHCMD = 'ssh -o StrictHostKeyChecking=no jenkins@${env.BUILDHOST}' } stages { stage('SSH Testing') { steps { sshagent ( ['jenkins_ssh']) { sh ''' $SSHCMD uname -a ''' } } } stage('Example Test') { steps { sshagent ( ['jenkins_ssh']) { sh ''' $SSHCMD /run/something.sh ''' } } } } } 

It works fine when I declare the var without any substitutions: SSHCMD = 'ssh -o StrictHostKeyChecking=no [email protected]'

but I can't seem to nest together the variables. Any way to do this?

Answer 1

This should work. However, you need to use double-quotes for String interpolation:

pipeline { agent any environment { BUILDHOST = 'buildhost01.example.com' SSHCMD = "ssh -o StrictHostKeyChecking=no jenkins@${env.BUILDHOST}" // <<< double-quotes } stages { stage('SSH Testing') { steps { sshagent ( ['jenkins_ssh']) { sh """ // <<< double-quotes $SSHCMD uname -a """ } } } stage('Example Test') { steps { sshagent ( ['jenkins_ssh']) { sh """ // <<< double-quotes $SSHCMD /run/something.sh """ } } } } } 

See also this answer.