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services: dhcp-client-configuration: Allow provision override.

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* gnu/services/networking.scm (<dhcp-client-configuration>)[shepherd-provision]:
New field.
(dhcp-client-shepherd-service): Honor it.
* doc/guix.texi (Networking Setup): Document it.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Alexey Abramov 2023-07-25 12:59:56 +02:00 committed by Ludovic Courtès
parent 944c1b62a1
commit 04f71edb73
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2 changed files with 13 additions and 4 deletions
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6
doc/guix.texi
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@ -20461,10 +20461,16 @@ non-loopback interfaces that can be activated. Otherwise the DHCP
client listens only on the specified interfaces.
@item @code{shepherd-requirement} (default: @code{'()})
@itemx @code{shepherd-provision} (default: @code{'(networking)})
This option can be used to provide a list of symbols naming Shepherd services
that this service will depend on, such as @code{'wpa-supplicant} or
@code{'iwd} if you require authenticated access for encrypted WiFi or Ethernet
networks.
Likewise, @code{shepherd-provision} is a list of Shepherd service names
(symbols) provided by this service. You might want to change the
default value if you intend to run several DHCP clients, only one of
which provides the @code{networking} Shepherd service.
@end table
@end deftp

11
gnu/services/networking.scm
View file

@ -89,6 +89,7 @@ (define-module (gnu services networking)
dhcp-client-configuration?
dhcp-client-configuration-package
dhcp-client-configuration-interfaces
dhcp-client-configuration-shepherd-provision
dhcp-client-configuration-shepherd-requirement
dhcpd-service-type
@ -303,6 +304,8 @@ (define-record-type* <dhcp-client-configuration>
(default isc-dhcp))
(shepherd-requirement dhcp-client-configuration-shepherd-requirement
(default '()))
(shepherd-provision dhcp-client-configuration-provision
(default '(networking)))
(interfaces dhcp-client-configuration-interfaces
(default 'all))) ;'all | list of strings
@ -310,19 +313,19 @@ (define dhcp-client-shepherd-service
(match-lambda
((? dhcp-client-configuration? config)
(let ((package (dhcp-client-configuration-package config))
(shepherd-requirement (dhcp-client-configuration-shepherd-requirement config))
(requirement (dhcp-client-configuration-shepherd-requirement config))
(provision (dhcp-client-configuration-shepherd-provision config))
(interfaces (dhcp-client-configuration-interfaces config))
(pid-file "/var/run/dhclient.pid"))
(list (shepherd-service
(documentation "Set up networking via DHCP.")
(requirement `(user-processes udev ,@shepherd-requirement))
(requirement `(user-processes udev ,@requirement))
(provision provision)
;; XXX: Running with '-nw' ("no wait") avoids blocking for a minute when
;; networking is unavailable, but also means that the interface is not up
;; yet when 'start' completes. To wait for the interface to be ready, one
;; should instead monitor udev events.
(provision '(networking))
(start #~(lambda _
(define dhclient
(string-append #$package "/sbin/dhclient"))