03/21: home-services: Add home-provenance-service-type.

[guix-commits]

wigust pushed a commit to branch wip-guix-home
in repository guix.

commit 305edf9c3a2dcaabc5a5216fc401c676222a463a
Author: Andrew Tropin <andrew@trop.in>
AuthorDate: Thu Aug 5 08:46:58 2021 +0300

    home-services: Add home-provenance-service-type.
    
    * gnu/home-services.scm (home-provenance-service-type, 
sexp->home-provenance,
    home-provenance): New variables.
    
    Signed-off-by: Oleg Pykhalov <go.wigust@gmail.com>
---
 gnu/home-services.scm | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/gnu/home-services.scm b/gnu/home-services.scm
index 32b59f5..d320d3a 100644
--- a/gnu/home-services.scm
+++ b/gnu/home-services.scm
@@ -38,7 +38,10 @@
             home-files-service-type
             home-run-on-first-login-service-type
             home-activation-service-type
-            home-run-on-change-service-type)
+            home-run-on-change-service-type
+            home-provenance-service-type
+
+            fold-home-service-types)
 
   #:re-export (service
                service-type
@@ -467,3 +470,25 @@ G-expressions to run if the specified files have changed 
since the
 last generation.  The extension should be a list of lists where the
 first element is the pattern for file or directory that expected to be
 changed, and the second element is the G-expression to be evaluated.")))
+
+
+;;;
+;;; Provenance tracking.
+;;;
+
+(define home-provenance-service-type
+  (service-type
+   (name 'home-provenance)
+   (extensions
+    (list (service-extension
+           home-service-type
+           (service-extension-compute
+            (first (service-type-extensions provenance-service-type))))))
+   (default-value #f)                ;the HE config file
+   (description "\
+Store provenance information about the home environment in the home
+environment itself: the channels used when building the home
+environment, and its configuration file, when available.")))
+
+(define sexp->home-provenance sexp->system-provenance)
+(define home-provenance system-provenance)