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services: shepherd: Support one-shot services.

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* gnu/services/shepherd.scm (<shepherd-service>)[one-shot?]: New field.
(shepherd-service-file): Pass #:one-shot? to the <service> constructor.
* doc/guix.texi (Shepherd Services): Document it.
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Ludovic Courtès 2019-04-23 14:48:56 +02:00
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commit 95ef8b85b1
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6
doc/guix.texi
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@ -25124,6 +25124,12 @@ shepherd, The GNU Shepherd Manual}). @xref{Slots of services, the
@item @code{requirements} (default: @code{'()})
List of symbols denoting the Shepherd services this one depends on.
@cindex one-shot services, for the Shepherd
@item @code{one-shot?} (default: @code{#f})
Whether this service is @dfn{one-shot}. One-shot services stop immediately
after their @code{start} action has completed. @xref{Slots of services,,,
shepherd, The GNU Shepherd Manual}, for more info.
@item @code{respawn?} (default: @code{#t})
Whether to restart the service when it stops, for instance when the
underlying process dies.

10
gnu/services/shepherd.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2016, 2018 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013, 2014, 2015, 2016, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Clément Lassieur <clement@lassieur.org>
;;; Copyright © 2018 Carlo Zancanaro <carlo@zancanaro.id.au>
;;;
@ -44,6 +44,7 @@
shepherd-service-provision
shepherd-service-canonical-name
shepherd-service-requirement
shepherd-service-one-shot?
shepherd-service-respawn?
shepherd-service-start
shepherd-service-stop
@ -149,6 +150,8 @@ DEFAULT is given, use it as the service's default value."
(provision shepherd-service-provision) ;list of symbols
(requirement shepherd-service-requirement ;list of symbols
(default '()))
(one-shot? shepherd-service-one-shot? ;Boolean
(default #f))
(respawn? shepherd-service-respawn? ;Boolean
(default #t))
(start shepherd-service-start) ;g-expression (procedure)
@ -238,6 +241,11 @@ stored."
#:docstring '#$(shepherd-service-documentation service)
#:provides '#$(shepherd-service-provision service)
#:requires '#$(shepherd-service-requirement service)
;; The 'one-shot?' slot is new in Shepherd 0.6.0.
;; Older versions ignore it.
#:one-shot? '#$(shepherd-service-one-shot? service)
#:respawn? '#$(shepherd-service-respawn? service)
#:start #$(shepherd-service-start service)
#:stop #$(shepherd-service-stop service)