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authorLudovic Courtès <ludo@gnu.org>2017-09-13 16:02:22 +0200
committerLudovic Courtès <ludo@gnu.org>2017-09-16 17:47:46 +0200
commit0c0c1b21d959a9761a247309428c64a92c599fb3 (patch)
tree22b0c8b2d377a4efd2056bafb683e847ba781128
parentb714395a39fffc60f75408504a23dfe27ad13fc2 (diff)
services: Add 'fold-service-types'.
* gnu/services.scm (%distro-root-directory, %service-type-path): New variables. (fold-service-types): New procedure.
-rw-r--r--gnu/services.scm24
1 files changed, 24 insertions, 0 deletions
diff --git a/gnu/services.scm b/gnu/services.scm
index 83a163b766..2ebd701a59 100644
--- a/gnu/services.scm
+++ b/gnu/services.scm
@@ -23,6 +23,7 @@
#:use-module (guix store)
#:use-module (guix records)
#:use-module (guix profiles)
+ #:use-module (guix discovery)
#:use-module (guix sets)
#:use-module (guix ui)
#:use-module ((guix utils) #:select (source-properties->location))
@@ -52,6 +53,8 @@
service-type-description
service-type-location
+ %service-type-path
+ fold-service-types
service
service?
@@ -165,6 +168,27 @@
(set-record-type-printer! <service-type> write-service-type)
+(define %distro-root-directory
+ ;; Absolute file name of the module hierarchy.
+ (dirname (search-path %load-path "guix.scm")))
+
+(define %service-type-path
+ ;; Search path for service types.
+ (make-parameter `((,%distro-root-directory . "gnu/services")
+ (,%distro-root-directory . "gnu/system"))))
+
+(define* (fold-service-types proc seed
+ #:optional
+ (modules (all-modules (%service-type-path))))
+ "For each service type exported by one of MODULES, call (PROC RESULT). SEED
+is used as the initial value of RESULT."
+ (fold-module-public-variables (lambda (object result)
+ (if (service-type? object)
+ (proc object result)
+ result))
+ '()
+ modules))
+
;; Services of a given type.
(define-record-type <service>
(make-service type value)