Re: Unfortunate statefulness of Guix Install image

[Tobias Geerinckx-Rice <me@tobias.gr>]

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Vladilen,

I'm writing mainly to save you some time testing ‘guix system init 
--localstatedir’.  That is a ./configure option used when building 
Guix from source.  I don't think any option will help you here.

Vladilen Kozin 写道：
> Except, when you try to do the manual install off the same USB
> ... twice.

You're likely the first person to try this!

I *think* it implies that /var/guix/db is low-key bogus once 
cow-store is stopped, but I didn't test that assertion.  It should 
be reverted together with /gnu/store.

IMO what you want should be possible.  That it's not is a bug, 
albeit a low-priority one.

> My best guess from what I've read in the manual is this. Store 
> is not
> the only place where derivations appear. /var/guix/db stores 
> metadata
> about said derivations. So the first time you do `herd start 
> cow-store
> /mnt` trick it'll create the store there but will populate the 
> db on
> that USB drive. Next time you try to install from that same USB 
> on a
> different machine it'll have its db reference derivations that 
> are no
> longer available. I worked around this by stupidly `mv 
> /var/guix/db
> /var/guix/db.old` and `guix system init` went without trouble.

This is a relatively simple fix.  Thanks for testing it.  Would 
you be able and willing to modify cow-store to handle /var/guix/db 
as well?

Kind regards,

T G-R

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