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-rw-r--r--gnu/home.scm26
1 files changed, 24 insertions, 2 deletions
diff --git a/gnu/home.scm b/gnu/home.scm
index a9f0a469a5..4ddbafe412 100644
--- a/gnu/home.scm
+++ b/gnu/home.scm
@@ -1,5 +1,6 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2021 Andrew Tropin <andrew@trop.in>
+;;; Copyright © 2022 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -27,7 +28,8 @@
#:use-module (guix diagnostics)
#:use-module (guix gexp)
#:use-module (guix store)
-
+ #:use-module (ice-9 match)
+ #:use-module (ice-9 regex)
#:export (home-environment
home-environment?
this-home-environment
@@ -38,7 +40,9 @@
home-environment-services
home-environment-location
- home-environment-with-provenance))
+ home-environment-with-provenance
+
+ home-generation-base))
;;; Comment:
;;;
@@ -114,3 +118,21 @@ of HOME-PROVENANCE-SERVICE-TYPE to its services."
(run-with-store store (home-environment-derivation he)
#:system system
#:target target)))))
+
+(define %profile-generation-rx
+ ;; Regexp that matches profile generation.
+ (make-regexp "(.*)-([0-9]+)-link$"))
+
+(define (home-generation-base file)
+ "If FILE is a Home generation GC root such as \"guix-home-42-link\",
+return its corresponding base---e.g., \"guix-home\". Otherwise return #f.
+
+This is similar to the 'generation-profile' procedure but applied to Home
+generations."
+ (match (regexp-exec %profile-generation-rx file)
+ (#f #f)
+ (m (let ((profile (match:substring m 1)))
+ ;; Distinguish from a "real" profile and from a system generation.
+ (and (file-exists? (string-append profile "/on-first-login"))
+ (file-exists? (string-append profile "/profile/manifest"))
+ profile)))))