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1bb895eabf
* gnu/services.scm (&no-default-value): New variable.
(<service-type>)[default-value]: New field.
(<service>): Rename constructor from 'service' to 'make-service'.
(service): New macro.
(%service-with-default-value): New procedure.
(&missing-value-service-error): New error condition.
* tests/services.scm ("services, default value"): New test.
* doc/guix.texi (Service Types and Services): Document 'default-value'.
(Service Reference): Explain default values.
209 lines
8.7 KiB
Scheme
209 lines
8.7 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (test-services)
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#:use-module (gnu services)
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#:use-module (gnu services herd)
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#:use-module (gnu services shepherd)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-34)
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#:use-module (srfi srfi-64))
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(define live-service
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(@@ (gnu services herd) live-service))
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(test-begin "services")
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(test-equal "services, default value"
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'(42 123 234 error)
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(let* ((t1 (service-type (name 't1) (extensions '())))
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(t2 (service-type (name 't2) (extensions '())
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(default-value 42))))
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(list (service-value (service t2))
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(service-value (service t2 123))
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(service-value (service t1 234))
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(guard (c ((missing-value-service-error? c) 'error))
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(service t1)))))
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(test-assert "service-back-edges"
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(let* ((t1 (service-type (name 't1) (extensions '())
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(compose +) (extend *)))
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(t2 (service-type (name 't2)
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(extensions
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(list (service-extension t1 (const '()))))
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(compose +) (extend *)))
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(t3 (service-type (name 't3)
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(extensions
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(list (service-extension t2 identity)
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(service-extension t1 list)))))
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(s1 (service t1 #t))
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(s2 (service t2 #t))
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(s3 (service t3 #t))
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(e (service-back-edges (list s1 s2 s3))))
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(and (lset= eq? (e s1) (list s2 s3))
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(lset= eq? (e s2) (list s3))
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(null? (e s3)))))
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(test-equal "fold-services"
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;; Make sure 'fold-services' returns the right result. The numbers come
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;; from services of type T3; 'xyz 60' comes from the service of type T2,
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;; where 60 = 15 × 4 = (1 + 2 + 3 + 4 + 5) × 4.
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'(initial-value 5 4 3 2 1 xyz 60)
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(let* ((t1 (service-type (name 't1) (extensions '())
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(compose concatenate)
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(extend cons)))
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(t2 (service-type (name 't2)
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(extensions
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(list (service-extension t1
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(cut list 'xyz <>))))
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(compose (cut reduce + 0 <>))
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(extend *)))
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(t3 (service-type (name 't3)
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(extensions
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(list (service-extension t2 identity)
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(service-extension t1 list)))))
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(r (fold-services (cons* (service t1 'initial-value)
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(service t2 4)
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(map (lambda (x)
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(service t3 x))
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(iota 5 1)))
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#:target-type t1)))
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(and (eq? (service-kind r) t1)
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(service-value r))))
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(test-assert "fold-services, ambiguity"
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(let* ((t1 (service-type (name 't1) (extensions '())
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(compose concatenate)
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(extend cons)))
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(t2 (service-type (name 't2)
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(extensions
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(list (service-extension t1 list)))))
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(s (service t2 42)))
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(guard (c ((ambiguous-target-service-error? c)
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(and (eq? (ambiguous-target-service-error-target-type c)
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t1)
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(eq? (ambiguous-target-service-error-service c)
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s))))
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(fold-services (list (service t1 'first)
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(service t1 'second)
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s)
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#:target-type t1)
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#f)))
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(test-assert "fold-services, missing target"
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(let* ((t1 (service-type (name 't1) (extensions '())))
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(t2 (service-type (name 't2)
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(extensions
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(list (service-extension t1 list)))))
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(s (service t2 42)))
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(guard (c ((missing-target-service-error? c)
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(and (eq? (missing-target-service-error-target-type c)
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t1)
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(eq? (missing-target-service-error-service c)
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s))))
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(fold-services (list s) #:target-type t1)
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#f)))
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(test-assert "shepherd-service-lookup-procedure"
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(let* ((s1 (shepherd-service (provision '(s1 s1b)) (start #f)))
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(s2 (shepherd-service (provision '(s2 s2b)) (start #f)))
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(s3 (shepherd-service (provision '(s3 s3b s3c)) (start #f)))
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(lookup (shepherd-service-lookup-procedure (list s1 s2 s3))))
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(and (eq? (lookup 's1) (lookup 's1b) s1)
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(eq? (lookup 's2) (lookup 's2b) s2)
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(eq? (lookup 's3) (lookup 's3b) s3))))
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(test-assert "shepherd-service-back-edges"
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(let* ((s1 (shepherd-service (provision '(s1)) (start #f)))
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(s2 (shepherd-service (provision '(s2))
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(requirement '(s1))
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(start #f)))
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(s3 (shepherd-service (provision '(s3))
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(requirement '(s1 s2))
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(start #f)))
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(e (shepherd-service-back-edges (list s1 s2 s3))))
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(and (lset= eq? (e s1) (list s2 s3))
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(lset= eq? (e s2) (list s3))
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(null? (e s3)))))
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(test-equal "shepherd-service-upgrade: nothing to do"
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'(() ())
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(call-with-values
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(lambda ()
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(shepherd-service-upgrade '() '()))
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list))
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(test-equal "shepherd-service-upgrade: one unchanged, one upgraded, one new"
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'(((bar)) ;unload
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((bar) (baz))) ;load
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(call-with-values
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(lambda ()
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;; Here 'foo' is not upgraded because it is still running, whereas
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;; 'bar' is upgraded because it is not currently running. 'baz' is
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;; loaded because it's a new service.
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(shepherd-service-upgrade
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(list (live-service '(foo) '() #t)
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(live-service '(bar) '() #f)
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(live-service '(root) '() #t)) ;essential!
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(list (shepherd-service (provision '(foo))
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(start #t))
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(shepherd-service (provision '(bar))
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(start #t))
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(shepherd-service (provision '(baz))
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(start #t)))))
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(lambda (unload load)
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(list (map live-service-provision unload)
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(map shepherd-service-provision load)))))
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(test-equal "shepherd-service-upgrade: service depended on is not unloaded"
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'(((baz)) ;unload
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()) ;load
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(call-with-values
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(lambda ()
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;; Service 'bar' is not among the target services; yet, it must not be
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;; unloaded because 'foo' depends on it.
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(shepherd-service-upgrade
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(list (live-service '(foo) '(bar) #t)
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(live-service '(bar) '() #t) ;still used!
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(live-service '(baz) '() #t))
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(list (shepherd-service (provision '(foo))
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(start #t)))))
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(lambda (unload load)
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(list (map live-service-provision unload)
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(map shepherd-service-provision load)))))
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(test-equal "shepherd-service-upgrade: obsolete services that depend on each other"
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'(((foo) (bar) (baz)) ;unload
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((qux))) ;load
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(call-with-values
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(lambda ()
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;; 'foo', 'bar', and 'baz' depend on each other, but all of them are
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;; obsolete, and thus should be unloaded.
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(shepherd-service-upgrade
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(list (live-service '(foo) '(bar) #t) ;obsolete
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(live-service '(bar) '(baz) #t) ;obsolete
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(live-service '(baz) '() #t)) ;obsolete
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(list (shepherd-service (provision '(qux))
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(start #t)))))
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(lambda (unload load)
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(list (map live-service-provision unload)
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(map shepherd-service-provision load)))))
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(test-end)
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