Ricardo Wurmus <rekado@elephly.net> writes:

> Hi Guix,
>
> I’m trying to install python-wrapper on core-updates:
>
> --8<---------------cut here---------------start------------->8---
[…]
> ERROR: In procedure open-file:
> ERROR: In procedure open-file: No such file or directory: "fonts.scale"
> builder for `/gnu/store/8j5bll1y0c3zrifrp984gd3gfarf0ra4-fonts-dir.drv' failed with exit code 1
> cannot build derivation `/gnu/store/md131pdqsvxmxna3ndwd5334x6876m54-profile.drv': 1 dependencies couldn't be built
> guix package: error: build failed: build of `/gnu/store/md131pdqsvxmxna3ndwd5334x6876m54-profile.drv' failed
> --8<---------------cut here---------------end--------------->8---
>
> Could this be because (@@ (guix profiles) fonts-dir-file) first deletes
> the file and then checks if the file is empty?

That’s exactly what happens.  I’ve fixed this locally with this patch: