Error while formatting jarName with branch name.

[dorazioel]

Hello, I'd like to make the branch I'm working on appear in my .jar name like "something-something-branchName".
The command to get the branch name is
Process("git rev-parse --abbrev-ref HEAD").!!
but if try
private lazy val jarName = assemblyJarName in assembly := { s"${name.value}-assembly-${Process("git rev-parse --abbrev-ref HEAD").!!}.jar" }
I get java.io.FileNotFoundException.

Can you help me?
Thank you