bug#44760: Closure copy in ‘guix system init’ is inefficient

[Ludovic Courtès]

Ludovic Courtès <ludo@gnu.org> skribis:

> ‘guix system init’ ends by copying the system’s closure from the “host”
> store to the target store; it also initializes the database of that
> target store.

There’s one ‘guix system init’ optimization that would be nice to have
in the installation image: instead of copying store items at all, simply
move the store from its temporary location in /mnt/tmp/guix-inst to
/mnt/gnu/store.  That’d make it zero-copy.

It would probably require a separate code path, but it’s worth
considering.

Thoughts?

Ludo’.