While deploying softwares ideally one we have version with specific commit/tag and then install it via spack.

We have some packages that are being installed from branch. This is useful in scenario where developer fix the issue and other users do spack install and they get what they want.

But I wonder if Spack stores associated commit id somewhere. I am looking at installed spec.yaml but there is only version: branch. Is there a way to store/retrieve that information? Won't that be useful?