home: Add home-oci-service-type.

* gnu/home/service/containers.scm: New file;
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi (OCI backed services): Document it.

Change-Id: I8ce5b301e8032d0a7b2a9ca46752738cdee1f030
Signed-off-by: Maxim Cournoyer <maxim@guixotic.coop>

doc/guix.texi

@@ -53002,6 +53002,120 @@ For details about @code{readymedia-configuration}, check out the
 documentation of the system service (@pxref{Miscellaneous Services,
 @code{readymedia-service-type}}).
 
+@subsubheading OCI backed services
+
+@cindex OCI-backed, for Home
+The @code{(gnu home services containers)} module provides the following service:
+
+@defvar home-oci-service-type
+This is the type of the service that allows to manage your OCI containers with
+the same consistent interface you use for your other Home Shepherd services.
+@end defvar
+
+This service is a direct mapping of the @code{oci-service-type} system
+service (@pxref{Miscellaneous Services, OCI backed services}).  You can
+use it like this:
+
+@lisp
+(use-modules (gnu services containers)
+             (gnu home services containers))
+
+(simple-service 'home-oci-provisioning
+                home-oci-service-type
+                (oci-extension
+                  (volumes
+                    (list
+                      (oci-volume-configuration (name "prometheus"))
+                      (oci-volume-configuration (name "grafana"))))
+                  (networks
+                    (list
+                      (oci-network-configuration (name "monitoring"))))
+                  (containers
+                   (list
+                    (oci-container-configuration
+                     (network "monitoring")
+                     (image
+                      (oci-image
+                        (repository "guile")
+                        (tag "3")
+                        (value (specifications->manifest '("guile")))
+                        (pack-options '(#:symlinks (("/bin/guile" -> "bin/guile"))
+                                        #:max-layers 2))))
+                     (entrypoint "/bin/guile")
+                     (command
+                      '("-c" "(display \"hello!\n\")")))
+                    (oci-container-configuration
+                      (image "prom/prometheus")
+                      (network "monitoring")
+                      (ports
+                       '(("9000" . "9000")
+                         ("9090" . "9090")))
+                      (volumes
+                       (list
+                        '(("prometheus" . "/var/lib/prometheus")))))
+                    (oci-container-configuration
+                      (image "grafana/grafana:10.0.1")
+                      (network "monitoring")
+                      (volumes
+                       '(("grafana:/var/lib/grafana"))))))))
+
+@end lisp
+
+You may specify a custom configuration by providing a
+@code{oci-configuration} record, exactly like for
+@code{oci-service-type}, but wrapping it in @code{for-home}:
+
+@lisp
+(use-modules (gnu services)
+             (gnu services containers)
+             (gnu home services containers))
+
+(service home-oci-service-type
+         (for-home
+          (oci-configuration
+           (runtime 'podman)
+           (verbose? #t))))
+
+(simple-service 'home-oci-provisioning
+                home-oci-service-type
+                (oci-extension
+                  (volumes
+                    (list
+                      (oci-volume-configuration (name "prometheus"))
+                      (oci-volume-configuration (name "grafana"))))
+                  (networks
+                    (list
+                      (oci-network-configuration (name "monitoring"))))
+                  (containers
+                   (list
+                    (oci-container-configuration
+                     (network "monitoring")
+                     (image
+                      (oci-image
+                        (repository "guile")
+                        (tag "3")
+                        (value (specifications->manifest '("guile")))
+                        (pack-options '(#:symlinks (("/bin/guile" -> "bin/guile"))
+                                        #:max-layers 2))))
+                     (entrypoint "/bin/guile")
+                     (command
+                      '("-c" "(display \"hello!\n\")")))
+                    (oci-container-configuration
+                      (image "prom/prometheus")
+                      (network "monitoring")
+                      (ports
+                       '(("9000" . "9000")
+                         ("9090" . "9090")))
+                      (volumes
+                       (list
+                        '(("prometheus" . "/var/lib/prometheus")))))
+                    (oci-container-configuration
+                      (image "grafana/grafana:10.0.1")
+                      (network "monitoring")
+                      (volumes
+                       '(("grafana:/var/lib/grafana"))))))))
+@end lisp
+
 @node Invoking guix home
 @section Invoking @command{guix home}
 

gnu/home/services/containers.scm

@@ -0,0 +1,49 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2025 Giacomo Leidi <goodoldpaul@autistici.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu home services containers)
+  #:use-module (gnu home services)
+  #:use-module (gnu home services shepherd)
+  #:use-module (gnu services)
+  #:use-module (gnu services configuration)
+  #:use-module (gnu services containers)
+  #:use-module (guix gexp)
+  #:use-module (guix packages)
+  #:use-module (srfi srfi-1)
+  #:export (home-oci-service-type))
+
+(define home-oci-service-type
+  (service-type
+   (inherit (system->home-service-type oci-service-type))
+   (extensions
+    (list
+     (service-extension home-profile-service-type
+                        (lambda (config)
+                          (let ((runtime-cli
+                                 (oci-configuration-runtime-cli config))
+                                (runtime
+                                 (oci-configuration-runtime config)))
+                            (oci-service-profile runtime runtime-cli))))
+     (service-extension home-shepherd-service-type
+                        oci-configuration->shepherd-services)))
+   (extend
+    (lambda (config extension)
+      (for-home
+       (oci-configuration
+        (inherit (oci-configuration-extend config extension))))))
+   (default-value (for-home (oci-configuration)))))

gnu/local.mk

@@ -105,6 +105,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/home/services.scm			\
   %D%/home/services/admin.scm			\
   %D%/home/services/backup.scm			\
+  %D%/home/services/containers.scm		\
   %D%/home/services/desktop.scm			\
   %D%/home/services/dict.scm			\
   %D%/home/services/dotfiles.scm		\