GPLv2 licence and original authors should be more clearly shown

[esotericnonsense]

Cargo.toml should probably have the licence in and inclusion in the root.

I think you want this in Cargo.toml:
license = "GPL-2.0-only"

Perhaps the AUTHORS file from busybox as well.

Great work!

[alexellis]

LICENSE at the root of the project and at the end of the README would be great too. I couldn't find the license at all.

[ratherDashing]

I’m working on a project that I’ve been looking for something like this but also concerned about the license. Before I look at the code please license this software.

[lbmn]

Using a copyfree license would give your project a competitive advantage...

[LongJohnCoder]

Using a copyfree license would give your project a competitive advantage...

The rustybox source is derived from busybox which is GPL, so this code is also under GPL. Language translation does not release the license requirements, so switching to a less restrictive license is not possible without permission of the busybox copyright owners.