[Nix-dev] nix-shell and persistent environment

[Ruben Astudillo]

hi

nix-shell is great, but when I update the nixpkgs or nix-collect-garbage
I lose the cache of those packages. I've thinking on do a special profile
that I could switch to per shell instance with nix-{shell,env}, but I
also found references to a deprecated buildEnv function for this. What is
the common alternative for this?

-- Ruben