[bug#68716,gnome-team,v2,5/5] services: gnome: Use a blocklist for udev configurations.

The gnome-udev-configuration-files now lists every udev rule and hardware
file, and remove files based on a user-supplied list of regular expressions.

* gnu/services/desktop.scm (gnome-desktop-configuration): Add the
udev-blocklist field.
(gnome-udev-configuration-files): Change behavior.

Change-Id: I6df4b896652581c42a35ea3ba1e4849ad72d12ef
---
 gnu/services/desktop.scm | 63 ++++++++++++++++++++++++++++++----------
 1 file changed, 48 insertions(+), 15 deletions(-)

Am Montag, dem 05.02.2024 um 19:30 +0100 schrieb Vivien Kraus:
> The gnome-udev-configuration-files now lists every udev rule and
> hardware
> file, and remove files based on a user-supplied list of regular
> expressions.
> 
> * gnu/services/desktop.scm (gnome-desktop-configuration): Add the
> udev-blocklist field.
> (gnome-udev-configuration-files): Change behavior.
> 
> Change-Id: I6df4b896652581c42a35ea3ba1e4849ad72d12ef
> ---
>  gnu/services/desktop.scm | 63 ++++++++++++++++++++++++++++++--------
> --
>  1 file changed, 48 insertions(+), 15 deletions(-)
> 
> diff --git a/gnu/services/desktop.scm b/gnu/services/desktop.scm
> index 263ae61698..8045406c10 100644
> --- a/gnu/services/desktop.scm
> +++ b/gnu/services/desktop.scm
> @@ -87,6 +87,7 @@ (define-module (gnu services desktop)
>    #:use-module (guix ui)
>    #:use-module (guix utils)
>    #:use-module (guix gexp)
> +  #:use-module (guix modules)
>    #:use-module (srfi srfi-1)
>    #:use-module (srfi srfi-26)
>    #:use-module (srfi srfi-35)
> @@ -156,6 +157,7 @@ (define-module (gnu services desktop)
>              gnome-desktop-configuration-shell
>              gnome-desktop-configuration-utilities
>              gnome-desktop-configuration-extra-packages
> +            gnome-desktop-configuration-udev-blocklist
>              gnome-desktop-service
>              gnome-desktop-service-type
>  
> @@ -1494,7 +1496,12 @@ (define-configuration/no-serialization gnome-
> desktop-configuration
>     "A list of GNOME-adjacent packages to also include.  This field
> is intended
>  for users to add their own packages to their GNOME experience. 
> Note, that it
>  already includes some packages that are considered essential by some
> (most?)
> -GNOME users."))
> +GNOME users.")
> +  (udev-blocklist
> +   (list-of-strings '())
> +   "A list of regular expressions denoting udev rules or hardware
> file names
> +provided by any package, that should not be installed.  By default,
> every udev
> +rule and hardware file specified by all packages are installed."))
>  
>  (define (gnome-package gnome name)
>    "Return the package NAME among the GNOME package inputs.  NAME can
> be a
> @@ -1509,20 +1516,46 @@ (define (gnome-packages gnome names)
>  (define (gnome-udev-configuration-files config)
>    "Return the list of GNOME dependencies that provide udev rules and
> hardware
>  files."
> -  (let* ((gnome (gnome-desktop-configuration-gnome config))
> -         (shell (gnome-desktop-configuration-shell config)))
> -    (or (any (match-lambda
> -               ((and pkg (= package-name "gnome-settings-daemon"))
> -                (list pkg))
> -               (_ #f))
> -             shell)
> -        (and (maybe-value-set? gnome)
> -             (gnome-packages gnome '("gnome-settings-daemon")))
> -        (raise
> -         (condition
> -          (&error-location
> -           (location (gnome-desktop-configuration-source-location
> config)))
> -          (&message (message (G_ "Missing gnome-settings-
> daemon"))))))))
> +  (let* ((all-packages
> +          (append
> +           (gnome-desktop-configuration-core-services config)
> +           (gnome-desktop-configuration-shell config)
> +           (gnome-desktop-configuration-utilities config)
> +           (let ((gnome-meta (gnome-desktop-configuration-gnome
> config)))
> +             (if (maybe-value-set? gnome-meta)
> +                 (begin
> +                   (warning
> +                    (gnome-desktop-configuration-source-location
> config)
> +                    (G_ "Using a meta-package for gnome-desktop is
> discouraged.~%"))
> +                   (list gnome-meta))
> +                 (list)))
> +           (gnome-desktop-configuration-extra-packages config))))
You could reuse the function that we have to implement for the profile
service anyway, no?
> +    (list
> +     (computed-file
> +      "gnome-udev-configurations"
> +      (with-imported-modules
> +          (source-module-closure '((guix build utils)))
> +        #~(begin
> +            (use-modules (guix build utils))
> +            (for-each
> +             (lambda (package)
> +               (with-directory-excursion
> +                   package
> +                 (for-each
> +                  (lambda (filename)
> +                    (mkdir-p (dirname (string-append #$output "/"
> filename)))
> +                    (copy-file filename (string-append #$output "/"
> filename)))
> +                  (find-files "."
> +                              (lambda (name st)
> +                                (or (string-prefix? "./lib/udev/"
> name)
> +                                    (string-prefix?
> "./libexec/udev/" name)))))))
IIRC, string-prefix matching is not a great idea with find-files. 
search-path-as-list from (guix build utils) is probably preferable.
> +             (list #$@all-packages))
> +            (for-each
> +             (lambda (pattern)
> +               (for-each
> +                delete-file-recursively
> +                (find-files #$output pattern)))
> +             (list #$@(gnome-desktop-configuration-udev-blocklist
> config)))))))))
>  
>  (define (gnome-polkit-settings config)
>    "Return the list of GNOME dependencies that provide polkit actions
> and
Cheers