bug#31843: guix pull corrupted current guix

[Julien Lepiller]

Hi, running guix pull this morning corrupted my current guix command.

I am running on guixsd. Because I don't have a lot of memory, I sent a 
generation of .config/guix/current to the server with:

guix archive --export -r `readlink -f .config/guix/current` | ssh 
machine guix archive --import

Then, I created a link from /var/guix/gcroots to the 
.config/guix/current, and from that to the store item that was 
transferred.


This morning, I tried to run guix pull to see how far it would go (and 
if I could download some parts from hydra or berlin). As expected, it 
ran out of memory, but left my store in a state where the guix command 
linked to from .config/guix/current only contains garbage. Attached is 
the output of "guix pull --cores=1" on that machine that lead to the 
bug, and the new content of the guix command.

The corrupted file is from a store item that was present (and valid) 
before I ran guix pull, so I thought it was impossible for guix to 
modify it.

I think a fix is to remove .config/guix/current, run an older version of 
guix to try and repair the store with guix gc, and send the guix package 
from my other machine again. I haven't tried that yet, as my broken 
machine still mostly works, although I doubt it can boot now. Since I 
didn't try to fix anything, I can give more details if you want. The 
guix I used to pull is from commit 
85d79a79e4b721e24cdfb11a90beef6d566c499a, and the pulled commit is 
0017e55f892828f7a4d29a50f06e5146270ab8cb.

guix-command
Description: Text document

guix-pull.log
Description: Text document