Change free space warning threshold from relative to absolute

[Pierre Neidhardt]

Hi!

Currently we display

--8<---------------cut here---------------start------------->8---
guix package: warning: only 4.9% of free space available on /gnu/store
hint: Consider deleting old profile generations and collecting garbage, along
these lines:

     guix gc --delete-generations=1m
--8<---------------cut here---------------end--------------->8---

when the drive has less than 5% free space.

I believe the 5% threshold to be not so relevant.  Indeed, on a 1 TiB
partition, 5% is 50 GiB.  I would not worry to much about deleting
generations then!

What about changing the threshold to 5 GiB?

By the way, this reminds me of the same Windows XP misfeature that bugged
millions of users for years :D

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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