bug#54495: unexpected download after gc

[David Elsing]

Hello,

AFAICT, there is no way to determine which ungrafted package a grafted
package comes from without the derivation of the grafted package (where
the ungrafted package is referenced). Therefore, I think adding a
reference to the ungrafted package in the package itself (your second
suggestion) would be the simplest way: https://issues.guix.gnu.org/66824

Presently, it is inconvenient to globally run guix gc at all for me, as
many (dependent) packages are deleted and substituted again when
rebuilding several profiles built with grafts.

Cheers,
David