;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016 Chris Marusich <cmmarusich@gmail.com>
;;;
;;; This file is part of GNU Guix.
(define (activation-script gexps)
"Return the system's activation script, which evaluates GEXPS."
(define actions
- (map (cut scheme-file "activate-service" <>) gexps))
-
- (scheme-file "activate"
- (with-imported-modules (source-module-closure
- '((gnu build activation)
- (guix build utils)))
- #~(begin
- (use-modules (gnu build activation)
- (guix build utils))
-
- ;; Make sure the user accounting database exists. If it
- ;; does not exist, 'setutxent' does not create it and
- ;; thus there is no accounting at all.
- (close-port (open-file "/var/run/utmpx" "a0"))
-
- ;; Same for 'wtmp', which is populated by mingetty et
- ;; al.
- (mkdir-p "/var/log")
- (close-port (open-file "/var/log/wtmp" "a0"))
-
- ;; Set up /run/current-system. Among other things this
- ;; sets up locales, which the activation snippets
- ;; executed below may expect.
- (activate-current-system)
-
- ;; Run the services' activation snippets.
- ;; TODO: Use 'load-compiled'.
- (for-each primitive-load '#$actions)))))
+ (map (cut program-file "activate-service.scm" <>) gexps))
+
+ (program-file "activate.scm"
+ (with-imported-modules (source-module-closure
+ '((gnu build activation)
+ (guix build utils)))
+ #~(begin
+ (use-modules (gnu build activation)
+ (guix build utils))
+
+ ;; Make sure the user accounting database exists. If it
+ ;; does not exist, 'setutxent' does not create it and
+ ;; thus there is no accounting at all.
+ (close-port (open-file "/var/run/utmpx" "a0"))
+
+ ;; Same for 'wtmp', which is populated by mingetty et
+ ;; al.
+ (mkdir-p "/var/log")
+ (close-port (open-file "/var/log/wtmp" "a0"))
+
+ ;; Set up /run/current-system. Among other things this
+ ;; sets up locales, which the activation snippets
+ ;; executed below may expect.
+ (activate-current-system)
+
+ ;; Run the services' activation snippets.
+ ;; TODO: Use 'load-compiled'.
+ (for-each primitive-load '#$actions)))))
(define (gexps->activation-gexp gexps)
"Return a gexp that runs the activation script containing GEXPS."
(extend append)
(description
"Register garbage-collector roots---i.e., store items that
-will not be reclaimed by the garbage collector.")))
+will not be reclaimed by the garbage collector.")
+ (default-value '())))
\f
;;;
instances
(service-type-extensions (service-kind svc))))
- (let ((instances (fold (lambda (service result)
- (vhash-consq (service-kind service) service
- result))
- vlist-null services)))
- (fold2 adjust-service-list
- services instances
- services)))
+ (let loop ((services services))
+ (define instances
+ (fold (lambda (service result)
+ (vhash-consq (service-kind service) service
+ result))
+ vlist-null services))
+
+ (define adjusted
+ (fold2 adjust-service-list
+ services instances
+ services))
+
+ ;; If we instantiated services, they might in turn depend on missing
+ ;; services. Loop until we've reached fixed point.
+ (if (= (length adjusted) (vlist-length instances))
+ adjusted
+ (loop adjusted))))
(define* (fold-services services
#:key (target-type system-service-type))
(eq? (service-kind service) target-type))
services)
((sink)
- (let loop ((sink sink))
- (let* ((dependents (map loop (dependents sink)))
- (extensions (map (apply-extension sink) dependents))
- (extend (service-type-extend (service-kind sink)))
- (compose (service-type-compose (service-kind sink)))
- (params (service-value sink)))
- ;; We distinguish COMPOSE and EXTEND because PARAMS typically has a
- ;; different type than the elements of EXTENSIONS.
- (if extend
- (service (service-kind sink)
- (extend params (compose extensions)))
- sink))))
+ ;; Use the state monad to keep track of already-visited services in the
+ ;; graph and to memoize their value once folded.
+ (run-with-state
+ (let loop ((sink sink))
+ (mlet %state-monad ((visited (current-state)))
+ (match (vhash-assq sink visited)
+ (#f
+ (mlet* %state-monad
+ ((dependents (mapm %state-monad loop (dependents sink)))
+ (visited (current-state))
+ (extensions -> (map (apply-extension sink) dependents))
+ (extend -> (service-type-extend (service-kind sink)))
+ (compose -> (service-type-compose (service-kind sink)))
+ (params -> (service-value sink))
+ (service
+ ->
+ ;; Distinguish COMPOSE and EXTEND because PARAMS typically
+ ;; has a different type than the elements of EXTENSIONS.
+ (if extend
+ (service (service-kind sink)
+ (extend params (compose extensions)))
+ sink)))
+ (mbegin %state-monad
+ (set-current-state (vhash-consq sink service visited))
+ (return service))))
+ ((_ . service) ;SINK was already visited
+ (return service)))))
+ vlist-null))
(()
(raise
(condition (&missing-target-service-error
HCoop / jackhill / guix / guix.git / blobdiff