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guix system: Do not unload services depended on. 

Reported by Mark H Weaver <mhw@netris.org>
at <https://lists.gnu.org/archive/html/guix-devel/2016-08/msg01470.html>.

* guix/scripts/system.scm (service-upgrade)[live-service-required?]: New
procedure.
[obsolete?]: Use it.
* tests/system.scm ("service-upgrade: service depended on is not
unloaded", "service-upgrade: obsolete services that depend on each
other"): New tests.
This commit is contained in:
Ludovic Courtès 2016-08-31 15:23:32 +02:00
parent 6673bddc9a
commit d4f8884fdb
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2 changed files with 38 additions and 1 deletions
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7
guix/scripts/system.scm
View File

@ -298,9 +298,14 @@ needs to be loaded."
(service (and (not (live-service-running service))
service))))
(define live-service-dependents
(shepherd-service-back-edges live
#:provision live-service-provision
#:requirement live-service-requirement))
(define (obsolete? service)
(match (lookup-target (first (live-service-provision service)))
(#f #t)
(#f (every obsolete? (live-service-dependents service)))
(_ #f)))
(define to-load

32
tests/system.scm
View File

@ -149,4 +149,36 @@
(list (map live-service-provision unload)
(map shepherd-service-provision load)))))
(test-equal "service-upgrade: service depended on is not unloaded"
'(((baz)) ;unload
()) ;load
(call-with-values
(lambda ()
;; Service 'bar' is not among the target services; yet, it must not be
;; unloaded because 'foo' depends on it.
(service-upgrade (list (live-service '(foo) '(bar) #t)
(live-service '(bar) '() #t) ;still used!
(live-service '(baz) '() #t))
(list (shepherd-service (provision '(foo))
(start #t)))))
(lambda (unload load)
(list (map live-service-provision unload)
(map shepherd-service-provision load)))))
(test-equal "service-upgrade: obsolete services that depend on each other"
'(((foo) (bar) (baz)) ;unload
((qux))) ;load
(call-with-values
(lambda ()
;; 'foo', 'bar', and 'baz' depend on each other, but all of them are
;; obsolete, and thus should be unloaded.
(service-upgrade (list (live-service '(foo) '(bar) #t) ;obsolete
(live-service '(bar) '(baz) #t) ;obsolete
(live-service '(baz) '() #t)) ;obsolete
(list (shepherd-service (provision '(qux))
(start #t)))))
(lambda (unload load)
(list (map live-service-provision unload)
(map shepherd-service-provision load)))))
(test-end)