Hi guix.
Is there a way to find which commit the installed package came
from. So that I could, for instance, `guix shell` this exact
package. Specific case where I'm at a loss is this.
At one point I installed emacs-next --with-branch=master. Well,
I've no clue what that master was pointing at at the time. I find
myself in the situation where current upstream master appears
subtly broken, but my local install is fine. But how do I get my
currently installed emacs-next version run inside `guix shell` or
`guix shell --container`?
--export-manifest is approximate and doesn't even give package
versions. Even if I start playing games with --export-channels
or Scheme %current-profile => manifest => lookup in inferior
that would still find whatever guix repo commit had for
emacs-next, not what I actually have installed.
Does guix track that sort of provenance for me to extract?
Thanks
