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services: herd: Report whether a service is transient.

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* gnu/services/herd.scm (<live-service>)[transient?]: New field.
(current-services): Check the value of 'transient?'.  Call
'resolve-transients'.
(resolve-transients): New procedure.
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Ludovic Courtès 2022-04-09 23:37:37 +02:00
parent 975966ba09
commit a2c759c830
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1 changed files with 42 additions and 6 deletions
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46
gnu/services/herd.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016-2019, 2022 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017, 2020 Mathieu Othacehe <m.othacehe@gmail.com>
;;;
;;; This file is part of GNU Guix.
@ -20,6 +20,7 @@
(define-module (gnu services herd)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-9 gnu)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
@ -46,6 +47,7 @@ (define-module (gnu services herd)
live-service-provision
live-service-requirement
live-service-running
live-service-transient?
live-service-canonical-name
with-shepherd-action
@ -194,10 +196,11 @@ (define-syntax alist-let*
;; Information about live Shepherd services.
(define-record-type <live-service>
(live-service provision requirement running)
(live-service provision requirement transient? running)
live-service?
(provision live-service-provision) ;list of symbols
(requirement live-service-requirement) ;list of symbols
(transient? live-service-transient?) ;Boolean
(running live-service-running)) ;#f | object
(define (live-service-canonical-name service)
@ -215,13 +218,46 @@ (define (current-services)
((services _ ...)
(match services
((('service ('version 0 _ ...) _ ...) ...)
(resolve-transients
(map (lambda (service)
(alist-let* service (provides requires running)
(live-service provides requires running)))
services))
(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)))
(x
#f))))))
(define (resolve-transients services)
"Resolve the subset of SERVICES whose 'transient?' field is undefined. This
is necessary to deal with Shepherd 0.9.0, which did not communicate whether a
service is transient."
;; All the fuss here is to make sure we make a single "eval root" request
;; for all of SERVICES.
(let* ((unresolved (filter (compose unspecified? live-service-transient?)
services))
(values (or (eval-there
`(and (defined? 'transient?) ;shepherd >= 0.9.0
(map (compose transient? lookup-running)
',(map (compose first
live-service-provision)
unresolved))))
(make-list (length unresolved) #f)))
(resolved (map (lambda (unresolved transient?)
(cons unresolved
(set-field unresolved
(live-service-transient?)
transient?)))
unresolved values)))
(map (lambda (service)
(or (assq-ref resolved service) service))
services)))
(define (unload-service service)
"Unload SERVICE, a symbol name; return #t on success."
(with-shepherd-action 'root ('unload (symbol->string service)) result