diff options
Diffstat (limited to 'guix/profiles.scm')
| -rw-r--r-- | guix/profiles.scm | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/guix/profiles.scm b/guix/profiles.scm index 1d354ecb78..96be421727 100644 --- a/guix/profiles.scm +++ b/guix/profiles.scm @@ -1,5 +1,5 @@ ;;; GNU Guix --- Functional package management for GNU -;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org> +;;; Copyright © 2013-2022 Ludovic Courtès <ludo@gnu.org> ;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org> ;;; Copyright © 2014, 2016 Alex Kost <alezost@gmail.com> ;;; Copyright © 2015 Mark H Weaver <mhw@netris.org> @@ -2037,9 +2037,14 @@ paths." (make-regexp (string-append "^" (regexp-quote (basename profile)) "-([0-9]+)"))) -(define (generation-number profile) - "Return PROFILE's number or 0. An absolute file name must be used." - (or (and=> (false-if-exception (regexp-exec (profile-regexp profile) +(define* (generation-number profile + #:optional (base-profile profile)) + "Return PROFILE's number or 0. An absolute file name must be used. + +Optionally, if BASE-PROFILE is provided, use it instead of PROFILE to +construct the regexp matching generations. This is useful in special cases +like: (generation-number \"/run/current-system\" %system-profile)." + (or (and=> (false-if-exception (regexp-exec (profile-regexp base-profile) (basename (readlink profile)))) (compose string->number (cut match:substring <> 1))) 0)) |