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| author | Ludovic Courtès <ludo@gnu.org> | 2022-04-09 23:37:37 +0200 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2022-04-10 00:17:40 +0200 |
| commit | a2c759c8304c461d096ab763568e7f71546ff4e8 (patch) | |
| tree | ed125b3b6a62f13ce4c8271e9b7df28808891e4e | |
| parent | 975966ba09e24d813cf94a794c4bd6375777372a (diff) | |
| download | guix-a2c759c8304c461d096ab763568e7f71546ff4e8.tar guix-a2c759c8304c461d096ab763568e7f71546ff4e8.tar.gz | |
services: herd: Report whether a service is transient.
* gnu/services/herd.scm (<live-service>)[transient?]: New field.
(current-services): Check the value of 'transient?'. Call
'resolve-transients'.
(resolve-transients): New procedure.
| -rw-r--r-- | gnu/services/herd.scm | 48 |
1 files changed, 42 insertions, 6 deletions
diff --git a/gnu/services/herd.scm b/gnu/services/herd.scm index 35d69376d0..80d08f849e 100644 --- a/gnu/services/herd.scm +++ b/gnu/services/herd.scm @@ -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 @@ live-service-provision live-service-requirement live-service-running + live-service-transient? live-service-canonical-name with-shepherd-action @@ -194,10 +196,11 @@ of pairs." ;; 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 @@ obtained." ((services _ ...) (match services ((('service ('version 0 _ ...) _ ...) ...) - (map (lambda (service) - (alist-let* service (provides requires running) - (live-service provides requires running))) - 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))) (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 |