New comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/pull/31602#issuecomment-865887586

Comment:
The reason to move out of `xbps-src` is:

- update-check doesn't need xbps
- running inside xbps-src requires xbps
- running inside xbps-src requires either chrooting (which requires xbps) or XBPS_ALLOW_CHROOT_BREAKOUT
- rewrite in a real programming language could speed things up a bit