[bug#67613] [PATCH v3 3/5] gnu: docker: Allow setting Shepherd dependencies in oci-container-configuration.

[Giacomo Leidi]

* gnu/services/docker.scm (oci-container-configuration)
[requirement]: New field;
(list-of-symbols): sanitize it;
(oci-container-shepherd-service): use it.
* doc/guix.texi: Document it.

Change-Id: Ic0ba336a2257d6ef7c658cfc6cd630116661f581
---
 doc/guix.texi           |  4 ++++
 gnu/services/docker.scm | 10 +++++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index fad0bf8c7c..2b9cc5602c 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -40474,6 +40474,10 @@ Miscellaneous Services
 @item @code{provision} (default: @code{""}) (type: string)
 Set the name of the provisioned Shepherd service.
 
+@item @code{requirement} (default: @code{'()}) (type: list-of-symbols)
+Set additional Shepherd services dependencies to the provisioned
+Shepherd service.
+
 @item @code{network} (default: @code{""}) (type: string)
 Set a Docker network for the spawned container.
 
diff --git a/gnu/services/docker.scm b/gnu/services/docker.scm
index df5884aca1..a5b1614fa9 100644
--- a/gnu/services/docker.scm
+++ b/gnu/services/docker.scm
@@ -320,6 +320,9 @@ (define (oci-sanitize-extra-arguments value)
 but ~a was found") el))))
    value))
 
+(define list-of-symbols?
+  (list-of symbol?))
+
 (define-maybe/no-serialization string)
 
 (define-configuration/no-serialization oci-container-configuration
@@ -376,6 +379,10 @@ (define-configuration/no-serialization 
oci-container-configuration
   (provision
    (maybe-string)
    "Set the name of the provisioned Shepherd service.")
+  (requirement
+   (list-of-symbols '())
+   "Set additional Shepherd services dependencies to the provisioned Shepherd
+service.")
   (network
    (maybe-string)
    "Set a Docker network for the spawned container.")
@@ -477,6 +484,7 @@ (define (oci-container-shepherd-service config)
           (oci-container-configuration-host-environment config))
          (command (oci-container-configuration-command config))
          (provision (oci-container-configuration-provision config))
+         (requirement (oci-container-configuration-requirement config))
          (image (oci-container-configuration-image config))
          (options (oci-container-configuration->options config))
          (name (guess-name provision image))
@@ -484,7 +492,7 @@ (define (oci-container-shepherd-service config)
           (oci-container-configuration-extra-arguments config)))
 
     (shepherd-service (provision `(,(string->symbol name)))
-                      (requirement '(dockerd user-processes))
+                      (requirement `(dockerd user-processes ,@requirement))
                       (respawn? #f)
                       (documentation
                        (string-append
-- 
2.41.0