[bug#56618,1/2] home: Add 'home-generation-base'.
Commit Message
* gnu/home.scm (%profile-generation-rx): New variable.
(home-generation-base): New procedure.
---
gnu/home.scm | 26 ++++++++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
Comments
On 2022-07-17 17:21, Ludovic Courtès wrote:
> * 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 <andrew@trop.in>
> +;;; Copyright © 2022 Ludovic Courtès <ludo@gnu.org>
> ;;;
> ;;; This file is part of GNU Guix.
> ;;;
> @@ -27,7 +28,8 @@ (define-module (gnu home)
> #: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 @@ (define-module (gnu home)
> home-environment-services
> home-environment-location
>
> - home-environment-with-provenance))
> + home-environment-with-provenance
> +
> + home-generation-base))
>
> ;;; Comment:
> ;;;
> @@ -114,3 +118,21 @@ (define-gexp-compiler (home-environment-compiler (he <home-environment>)
> (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)))
Is home environment and operating system a profile itself? They reside
in /var/guix/profile, but they have profile/ directory inside, so do
they profiles themselves? I don't propose any changes, just asking.
> + ;; 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)))))
Hi,
Andrew Tropin <andrew@trop.in> skribis:
> Is home environment and operating system a profile itself? They reside
> in /var/guix/profile, but they have profile/ directory inside, so do
> they profiles themselves?
No, they’re not profiles (they contain a profile), so they need to be
treated specially for the purposes of ‘guix gc -d’.
Ludo’.
@@ -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 @@ (define-module (gnu home)
#: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 @@ (define-module (gnu home)
home-environment-services
home-environment-location
- home-environment-with-provenance))
+ home-environment-with-provenance
+
+ home-generation-base))
;;; Comment:
;;;
@@ -114,3 +118,21 @@ (define-gexp-compiler (home-environment-compiler (he <home-environment>)
(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)))))