civodul pushed a commit to branch master
in repository guix.
commit 61db74a687e36e842077c5c2f4b2e2c7afcd814a
Author: Ludovic Courtès <[email protected]>
AuthorDate: Sun Jul 31 23:00:53 2022 +0200
home: Add 'home-generation-base'.
This reverts commit 670818a4049edb8a77a5b596fbc7558bde57165c,
thereby reinstating 5df8f7802e8b45855e8f84830677001dc631e4f7.
* gnu/home.scm (%profile-generation-rx): New variable.
(home-generation-base): New procedure.
---
gnu/home.scm | 26 ++++++++++++++++++++++++--
1 file 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 <[email protected]>
+;;; Copyright © 2022 Ludovic Courtès <[email protected]>
;;;
;;; 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)))))
