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guix system: search: Display default Shepherd service names.

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Fixes <https://bugs.gnu.org/29707>.
Reported by Clément Lassieur <clement@lassieur.org>.

* guix/scripts/system/search.scm (service-type-default-shepherd-services)
(service-type-shepherd-names): New procedures.
(service-type->recutils): Use it.
* tests/guix-system.sh: Add test.
This commit is contained in:
Ludovic Courtès 2018-04-30 12:57:23 +02:00
parent f675d8b97d
commit 6ac8b7359a
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2 changed files with 38 additions and 2 deletions
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37
guix/scripts/system/search.scm
View file

@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017, 2018 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -20,9 +20,11 @@ (define-module (guix scripts system search)
#:use-module (guix ui)
#:use-module (guix utils)
#:use-module (gnu services)
#:use-module (gnu services shepherd)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-34)
#:use-module (ice-9 regex)
#:use-module (ice-9 match)
#:export (service-type->recutils
@ -39,6 +41,29 @@ (define-module (guix scripts system search)
(define service-type-name*
(compose symbol->string service-type-name))
(define (service-type-default-shepherd-services type)
"Return the list of Shepherd services created by default instances of TYPE,
provided TYPE has a default value."
(match (guard (c ((service-error? c) #f))
(service type))
(#f '())
((? service? service)
(let* ((extension (find (lambda (extension)
(eq? (service-extension-target extension)
shepherd-root-service-type))
(service-type-extensions type)))
(compute (and extension (service-extension-compute extension))))
(if compute
(compute (service-value service))
'())))))
(define (service-type-shepherd-names type)
"Return the default names of Shepherd services created for TYPE."
(match (map shepherd-service-provision
(service-type-default-shepherd-services type))
(((names . _) ...)
names)))
(define* (service-type->recutils type port
#:optional (width (%text-width))
#:key (extra-fields '()))
@ -66,6 +91,16 @@ (define (extensions->recutils extensions)
(format port "extends: ~a~%"
(extensions->recutils (service-type-extensions type)))
;; If possible, display the list of *default* Shepherd service names. Note
;; that we may not always be able to do this (e.g., if the service type
;; lacks a default value); furthermore, it could be that the service
;; generates Shepherd services with different names if we give it different
;; parameters (this is the case, for instance, for
;; 'console-font-service-type'.)
(match (service-type-shepherd-names type)
(() #f)
(names (format port "shepherdnames:~{ ~a~}~%" names)))
(when (service-type-description type)
(format port "~a~%"
(string->recutils

3
tests/guix-system.sh
View file

@ -1,5 +1,5 @@
# GNU Guix --- Functional package management for GNU
# Copyright © 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
# Copyright © 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
# Copyright © 2017 Tobias Geerinckx-Rice <me@tobias.gr>
# Copyright © 2018 Chris Marusich <cmmarusich@gmail.com>
#
@ -267,6 +267,7 @@ guix system build "$tmpdir/config.scm" -n
# Searching.
guix system search tor | grep "^name: tor"
guix system search tor | grep "^shepherdnames: tor"
guix system search anonym network | grep "^name: tor"
# Below, use -n (--dry-run) for the tests because if we actually tried to