Hello,

I was using file-owner crate and suddenly today the builds failed 
because a new nix version was pushed where the feature flags were all 
turned off by default.

It appears the feature flags were introduced in v0.24 and haven't 
changed since, so simply bumping the version in Cargo.toml makes it 
build again:

 > nix = { version = ">=0.24", features = [ "user", "fs" ] }

Take care