Hi, Well, I do not know if it is a bug or if I misuse something. Feel free to close if I am missing a point.
--8<---------------cut here---------------start------------->8--- $ guix describe Generation 25 mai 19 2023 13:30:14 (current) guix 14c0380 repository URL: https://git.savannah.gnu.org/git/guix.git branch: master commit: 14c03807ba4bc81d42cf869f5b827f7da54ff843 $ git -C ~/.cache/guix/checkouts/pjmkglp4t7znuugeurpurzikxq3tnlaywmisyr27shj7apsnalwq log --oneline -1 14c03807ba4 (HEAD -> master) gnu: ruby-3.2: Upgrade to 3.2.2 [fixes CVE-2023-{28755, 28756}]. --8<---------------cut here---------------end--------------->8--- Well, that’s just a luck that both commit hash matches. Now, what I am missing. The manual says: As for ‘guix pull’, the absence of any options means that the latest commit on the master branch will be used. The command guix time-machine -- build hello will thus build the package ‘hello’ as defined in the master branch, which is in general a newer revision of Guix than you have installed. Time travel works in both directions! and I get: --8<---------------cut here---------------start------------->8--- $ guix time-machine -- describe guix e499cb2 repository URL: https://git.savannah.gnu.org/git/guix.git commit: e499cb2c12d7f1c6d2f004364c9cc7bdb7e38cd5 --8<---------------cut here---------------end--------------->8--- But I do not understand from where this commit hash is coming from. And please note that this commit seems coming from my previous experiments reported in #63667 [1]. Well, the last commit seems a9cde26133b, --8<---------------cut here---------------start------------->8--- $ git -C ~/.cache/guix/checkouts/pjmkglp4t7znuugeurpurzikxq3tnlaywmisyr27shj7apsnalwq log origin/master --oneline -1 a9cde26133b (origin/master, origin/HEAD) gnu: Add mouseloupe. --8<---------------cut here---------------end--------------->8--- Therefore, let create a Guix revision: --8<---------------cut here---------------start------------->8--- $ guix time-machine --commit=a9cde26133b -- describe guix a9cde26 repository URL: https://git.savannah.gnu.org/git/guix.git commit: a9cde26133bd98498869a3528d9dff0d3f456a96 --8<---------------cut here---------------end--------------->8--- However, still this e499cb2 one: --8<---------------cut here---------------start------------->8--- $ guix time-machine -- describe guix e499cb2 repository URL: https://git.savannah.gnu.org/git/guix.git commit: e499cb2c12d7f1c6d2f004364c9cc7bdb7e38cd5 --8<---------------cut here---------------end--------------->8--- Cheers, simon 1: https://issues.guix.gnu.org/issue/63667