Commit of currently installed package?

Commit of currently installed package?

[t]

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

Re: Commit of currently installed package?

[zimoun]

Hi,

On Tue, 4 Jan 2022 at 17:02, <t@fullmeta.me> wrote:

> At one point I installed emacs-next --with-branch=master. Well,

[...]

> --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.

No, you cannot know.  Well, that information is not stored by Guix,
AFAIK.  Indeed, it could nice, instead of the current "guix package
--export-manifest":

--8<---------------cut here---------------start------------->8---
(use-modules (guix transformations))

(define transform1
  (options->transformation
    '((with-branch . "emacs-next=master"))))

(packages->manifest
  (list (transform1
          (specification->package "emacs-next"))))
--8<---------------cut here---------------end--------------->8---

To replace 'master' by the commit used.

As a workaround, if it is recent enough (not removed by
last-expiry-cleanup ;-)), the temporary Emacs checkout could be still
there. :-)  Give a look at ~/.cache/guix/checkouts/ and probably
5buqmtmwqjycqg4thcbrvijjn74pijwvjy7ueikyoln7r7d7q6kq.


Hope that helps,
simon