pkgsrc has been ported to various OSs, is the default in at least two and supports both binary and source packages.
If I were to choose a package system for a new OS, it'd probably be my choice.
I look forward to the first "distro" of Redox!
I hope that this distro's package management system follows the best practices of The Update Framework[0] or just reimplements a well-engineered existing architecture for distro updates.
Actually the Rust ecosystem is doing some exciting work on supply chain security[1], but it would be good to have something like pacman-bintrans[2] supported from day one of any new distro.
[0] https://theupdateframework.io/
[1] https://docs.rs/cargo_crev_reviews/2022.122.1621/cargo_crev_...
As soon as there's a working compiler it might be fun to implement something like gentoo's ports system, would be quite fun to run something like that as an excercise in how far pure rust can get you. :D