Hi there,
Now that nix 2.4 is out, i am trying to learn how flakes work. Everything is making sense for single flakes, but I am having some issues when trying to compose several flakes. Here is an example: a simple flake in tmp/flake_exp:
{
description = "A flake for building Hello World";
inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-20.03;
outputs = { self, nixpkgs }: {
defaultPackage.x86_64-linux =
with import nixpkgs { system = "x86_64-linux"; };
stdenv.mkDerivation {
name = "foo";
src = self;
buildPhase = "gcc -o foo ./hello.c";
installPhase = "mkdir -p $out/bin; install -t $out/bin foo";
};
};
}
this is just the normal intro hello flake, but i have renamed the executable to foo. This builds exactly as I would expect using nix build. Now here is a second flake located in /tmp/flake_exp_2:
{
description = "A dev environment";
inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-20.03;
inputs.foo.url = path:/tmp/flake_exp;
outputs = { self, nixpkgs, foo }: {
devShell.x86_64-linux =
# Notice the reference to nixpkgs here.
with import nixpkgs { system = "x86_64-linux"; };
mkShell {
buildInputs = [foo];
};
};
}
I would expect that running nix develop would enter a shell where the foo built by the first flake would be in $PATH, but it is missing. Presumably i am misunderstanding something, but I am not sure what. Any help understanding would be greatly appreciated!
