#:use-module (guix records)
#:use-module (guix derivations) ;imported-modules, etc.
#:use-module (gnu services)
+ #:use-module (gnu services herd)
#:use-module (gnu packages admin)
#:use-module (ice-9 match)
#:use-module (ice-9 vlist)
shepherd-service-file
shepherd-service-lookup-procedure
- shepherd-service-back-edges))
+ shepherd-service-back-edges
+ shepherd-service-upgrade))
;;; Commentary:
;;;
((_ . service) service)
(#f #f)))))
-(define (shepherd-service-back-edges services)
+(define* (shepherd-service-back-edges services
+ #:key
+ (provision shepherd-service-provision)
+ (requirement shepherd-service-requirement))
"Return a procedure that, when given a <shepherd-service> from SERVICES,
-returns the list of <shepherd-service> that depend on it."
+returns the list of <shepherd-service> that depend on it.
+
+Use PROVISION and REQUIREMENT as one-argument procedures that return the
+symbols provided/required by a service."
(define provision->service
- (shepherd-service-lookup-procedure services))
+ (shepherd-service-lookup-procedure services provision))
(define edges
(fold (lambda (service edges)
(vhash-consq (provision->service requirement) service
edges))
edges
- (shepherd-service-requirement service)))
+ (requirement service)))
vlist-null
services))
(lambda (service)
(vhash-foldq* cons '() service edges)))
+(define (shepherd-service-upgrade live target)
+ "Return two values: 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 (first (live-service-provision service))
+ '(root shepherd)))
+
+ (define lookup-target
+ (shepherd-service-lookup-procedure target
+ shepherd-service-provision))
+
+ (define lookup-live
+ (shepherd-service-lookup-procedure live
+ live-service-provision))
+
+ (define (running? service)
+ (and=> (lookup-live (shepherd-service-canonical-name service))
+ live-service-running))
+
+ (define (stopped service)
+ (match (lookup-live (shepherd-service-canonical-name service))
+ (#f #f)
+ (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 (every obsolete? (live-service-dependents service)))
+ (_ #f)))
+
+ (define to-load
+ ;; Only load services that are either new or currently stopped.
+ (remove running? target))
+
+ (define to-unload
+ ;; Unload services that are (1) no longer required, or (2) are in TO-LOAD.
+ (remove essential?
+ (append (filter obsolete? live)
+ (filter-map stopped to-load))))
+
+ (values to-unload to-load))
+
;;; shepherd.scm ends here