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authorMaxim Cournoyer <maxim.cournoyer@gmail.com>2023-05-18 20:21:35 -0400
committerMaxim Cournoyer <maxim.cournoyer@gmail.com>2023-07-21 11:58:44 -0400
commitf15c5edb1a2423402b32a5262627eb2141becf65 (patch)
treed545f303915427e4aa40f8f4872c824cb76cecd2 /gnu/services
parentc4713ad89d186ad51a439193d8cc775b4aef06d8 (diff)
services: herd: Add a new 'current-service' procedure.
* gnu/services/herd.scm (current-service): New procedure, mostly reusing the existing current-services. (current-services): Implement in terms of the above procedure.
Diffstat (limited to 'gnu/services')
-rw-r--r--gnu/services/herd.scm52
1 files changed, 33 insertions, 19 deletions
diff --git a/gnu/services/herd.scm b/gnu/services/herd.scm
index c24a403935..4b47acf72a 100644
--- a/gnu/services/herd.scm
+++ b/gnu/services/herd.scm
@@ -1,6 +1,7 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016-2019, 2022-2023 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017, 2020 Mathieu Othacehe <m.othacehe@gmail.com>
+;;; Copyright © 2023 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -51,6 +52,7 @@
live-service-canonical-name
with-shepherd-action
+ current-service
current-services
unload-services
unload-service
@@ -208,31 +210,43 @@ of pairs."
"Return the 'canonical name' of SERVICE."
(first (live-service-provision service)))
-(define (current-services)
- "Return the list of currently defined Shepherd services, represented as
-<live-service> objects. Return #f if the list of services could not be
-obtained."
- (with-shepherd-action 'root ('status) results
- ;; We get a list of results, one for each service with the name 'root'.
+(define (current-service name)
+ "Return the currently defined Shepherd service NAME, as a <live-service>
+object. Return #f if the service could not be obtained. As a special case,
+@code{(current-service 'root)} returns all the current services."
+ (define (process-services services)
+ (resolve-transients
+ (map (lambda (service)
+ (alist-let* service (provides requires running transient?)
+ ;; The Shepherd 0.9.0 would not provide 'transient?' in
+ ;; its status sexp. Thus, when it's missing, query it
+ ;; via an "eval" request.
+ (live-service provides requires
+ (if (sloppy-assq 'transient? service)
+ transient?
+ (and running *unspecified*))
+ running)))
+ services)))
+
+ (with-shepherd-action name ('status) results
+ ;; We get a list of results, one for each service with the name NAME.
;; In practice there's only one such service though.
(match results
((services _ ...)
(match services
((('service ('version 0 _ ...) _ ...) ...)
- (resolve-transients
- (map (lambda (service)
- (alist-let* service (provides requires running transient?)
- ;; The Shepherd 0.9.0 would not provide 'transient?' in its
- ;; status sexp. Thus, when it's missing, query it via an
- ;; "eval" request.
- (live-service provides requires
- (if (sloppy-assq 'transient? service)
- transient?
- (and running *unspecified*))
- running)))
- services)))
+ ;; Summary of all services (when NAME is 'root or 'shepherd).
+ (process-services services))
+ (('service ('version 0 _ ...) _ ...) ;single service
+ (first (process-services (list services))))
(x
- #f))))))
+ #f)))))) ;singleton
+
+(define (current-services)
+ "Return the list of currently defined Shepherd services, represented as
+<live-service> objects. Return #f if the list of services could not be
+obtained."
+ (current-service 'root))
(define (resolve-transients services)
"Resolve the subset of SERVICES whose 'transient?' field is undefined. This