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authorLudovic Courtès <ludo@gnu.org>2016-08-30 22:40:24 +0200
committerLudovic Courtès <ludo@gnu.org>2016-08-31 15:44:20 +0200
commitb8692e4696d0d2b36466827da1e0d25d69a298af (patch)
treec073388b0b4761f0fa719bc3ba66f3964de3dfd9 /guix/scripts/system.scm
parent183605c8533ad321ff8bba209b64071a9e84714a (diff)
guix system: Extract and test the service upgrade procedure.
* guix/scripts/system.scm (service-upgrade): New procedure, with code from... (call-with-service-upgrade-info): ... here. Use it. * tests/system.scm (live-service, service-upgrade): New variables. ("service-upgrade: nothing to do", "service-upgrade: one unchanged, one upgraded, one new"): New tests.
Diffstat (limited to 'guix/scripts/system.scm')
-rw-r--r--guix/scripts/system.scm65
1 files changed, 39 insertions, 26 deletions
diff --git a/guix/scripts/system.scm b/guix/scripts/system.scm
index 55a8e475d4..a006b2d54e 100644
--- a/guix/scripts/system.scm
+++ b/guix/scripts/system.scm
@@ -272,40 +272,53 @@ on service '~a':~%")
((not error) ;not an error
#t)))
-(define (call-with-service-upgrade-info new-services mproc)
- "Call MPROC, a monadic procedure in %STORE-MONAD, passing it the list of
-names of services to load (upgrade), and the list of names of services to
-unload."
+(define (service-upgrade live target)
+ "Return two values: the names of the subset of LIVE (a list of
+<live-service>) that needs to be unloaded, and the subset of TARGET (a list of
+<shepherd-service>) that needs to be loaded."
(define (essential? service)
(memq service '(root shepherd)))
(define new-service-names
(map (compose first shepherd-service-provision)
- new-services))
+ target))
+
+ (define running
+ (map (compose first live-service-provision)
+ (filter live-service-running live)))
+
+ (define stopped
+ (map (compose first live-service-provision)
+ (remove live-service-running live)))
+
+ (define to-load
+ ;; Only load services that are either new or currently stopped.
+ (remove (lambda (service)
+ (memq (first (shepherd-service-provision service))
+ running))
+ target))
+
+ (define to-unload
+ ;; Unload services that are (1) no longer required, or (2) are in TO-LOAD.
+ (remove essential?
+ (append (remove (lambda (service)
+ (memq service new-service-names))
+ (append running stopped))
+ (filter (lambda (service)
+ (memq service stopped))
+ (map shepherd-service-canonical-name
+ to-load)))))
+
+ (values to-unload to-load))
+(define (call-with-service-upgrade-info new-services mproc)
+ "Call MPROC, a monadic procedure in %STORE-MONAD, passing it the list of
+names of services to load (upgrade), and the list of names of services to
+unload."
(match (current-services)
((services ...)
- (let* ((running (map (compose first live-service-provision)
- (filter live-service-running services)))
- (stopped (map (compose first live-service-provision)
- (remove live-service-running services)))
- (to-load
- ;; Only load services that are either new or currently stopped.
- (remove (lambda (service)
- (memq (first (shepherd-service-provision service))
- running))
- new-services))
- (to-unload
- ;; Unload services that are (1) no longer required, or (2) are
- ;; in TO-LOAD.
- (remove essential?
- (append (remove (lambda (service)
- (memq service new-service-names))
- (append running stopped))
- (filter (lambda (service)
- (memq service stopped))
- (map shepherd-service-canonical-name
- to-load))))))
+ (let-values (((to-unload to-load)
+ (service-upgrade services new-services)))
(mproc to-load to-unload)))
(#f
(with-monad %store-monad