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From: | david larsson |
Subject: | bug#58247: Using guix time-machine results in unsupported manifest format error |
Date: | Thu, 20 Oct 2022 20:44:23 +0200 |
On 2022-10-03 00:10, zimoun wrote: [..]
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, andthen, 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.
Hi, Thanks for the clarification.I imagine it would be possible to give it a dirty fix, approximately as you just showed with /tmp/old, if you also just readd the default profile's currently installed packages to it at the end. So, if using ~/.guix-profile, it would be something like:
1. Say your ~/.guix-profile is at commit=XYZ2. build a NEW profile with the old package ONLY, from commit=ABC (as in /tmp/old)
3. guix pull /tmp/old "back" to commit=XYZ4. install remaining packages that was in your ~/.guix-profile to /tmp/old.
5. mv the ~/.guix-profile symlink to /tmp/old.( /tmp/old should just be in /var/guix/profiles/per-user/$USER as normal )
Building a new package generation like this would not be the same as usual, cuz the currently installed packages may come from different guix revisions. That might be a dealbreaker for fixing it. I do think it's very sad though, that the time-machine is kind of broken whenever the manifest gets a new version, with no hint even to the user how to find a solution.
Best regards, David
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