Hi, On Sun, 02 Oct 2022 at 20:57, david larsson <david.lars...@selfhosted.xyz> wrote: > On 2022-10-02 19:02, zimoun wrote:
>> It is probably because an issue with version of manifest; e.g, fixed by >> 67a6828b2bb821274757f686f7c685b664339a96. See >> <https://issues.guix.gnu.org/57306>. > > Note that the commit I'm on, is from 2 days ago, which is after the fix > commit you're mentioning. Yes, note that the earlier mentioned commit 7e8e07033d2a6b0ecef566a05084c534c774cd4a is from Oct 2021 if I read correctly. > Not sure it matters, but Im able to run guix time-machine > --commit=<somecommit> -- describe but not package -i <somepackage> IIUC, ’describe’ reads from ~/.config/guix/current/manifest and here the issue is from ~/.guix-profile/manifest. Maybe I am wrong, but I think the issue is coming from an incompatibility about the version of ~/.guix-profile/manifest. This manifest is at the version 4. When you run guix time-machine --commit=<commit> -- package -i hello then I guess it works or not depending on <commit>. The manifest file ~/.guix-profile/manifest needs to be updated and there is a conflict because some versions of the profile manifest. For instance, consider two profiles generated using 2 different revisions of Guix – a recent one and an old one: --8<---------------cut here---------------start------------->8--- $ guix time-machine --commit=729ce5f -- package -i hello -p /tmp/new $ cat /tmp/new/manifest | grep -A 1 '(manifest' (manifest (version 4) --8<---------------cut here---------------end--------------->8--- and --8<---------------cut here---------------start------------->8--- $ guix time-machine --commit=7e8e070 -- package -i hello -p /tmp/old $ cat /tmp/old/manifest | grep -A 1 '(manifest' (manifest (version 3) --8<---------------cut here---------------end--------------->8--- Now, consider the recent profile named /tmp/new and try to install a previous package from an old commit, --8<---------------cut here---------------start------------->8--- $ guix time-machine --commit=7e8e070 -- package -i hello -p /tmp/new guix package: error: unsupported manifest format --8<---------------cut here---------------end--------------->8--- The old Guix uses version 3 and cannot read/write version 4 and bang! Let try the converse, --8<---------------cut here---------------start------------->8--- $ guix time-machine --commit=729ce5f -- package -i hello -p /tmp/old $ cat /tmp/old/manifest | grep -A 1 '(manifest' (manifest (version 4) $ guix package --list-generations -p /tmp/old Generation 1 oct. 02 2022 18:53:10 hello 2.10 out /gnu/store/xg67cpxq2p6q7wn4y2z194pndwdymhpf-hello-2.10 Generation 2 oct. 02 2022 21:25:11 (current) + hello 2.12.1 out /gnu/store/s5pd3rnzymliafb4la5sca63j86xs0y0-hello-2.12.1 - hello 2.10 out /gnu/store/xg67cpxq2p6q7wn4y2z194pndwdymhpf-hello-2.10 --8<---------------cut here---------------end--------------->8--- This profile /tmp/old is thus converted from version 3 to version 4, and then, reusing old version of Guix fails, --8<---------------cut here---------------start------------->8--- $ guix time-machine --commit=7e8e070 -- package -i hello -p /tmp/old guix package: error: unsupported manifest format --8<---------------cut here---------------end--------------->8--- Well, I do not know if a fix is possible. The issue is a backward compatibility issue. Cheers, simon
