Trying to apply DLC for a game installed by Guix (help!)

Guix
2

First of all, guix has excellent built-in capabilities for modifying existing packages.
Perhaps the easiest way is to use package transformation options:

guix install tome4 --with-source=file:///home/user/random-directory/tome4.tar.gz

The other way is to define package variants. It is essentially the same as the first, but is done at the package definition level:

(define-module (my-tome4)
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (gnu packages games))

(define-public my-tome4
  (package
    (inherit tome4)
    (source
     (origin
       (method url-fetch)
       (uri "file:///home/user/random-directory/tome4.tar.gz")
       (sha256
        (base32 "sha256checksumgoeshere"))
       (modules '((guix build utils)))))))

Here’s a tip on how to use your own guile modules with guix packages.
Also remember that the module names and file names in guile must match each other:
(packages tome4) = packages/tome4.scm
If the names of your package and the original package are the same, you can use the --install-from-expression= option to specify which module the package should be taken from:

guix package -e '(@ (my-tome4) tome4)'

Lastly, I believe this should be done the way it is done in the obs package. There is a search path variable that specifies where the plugins should be loaded from, and thus the plugins can be packaged separately.

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