nix-env with locally installed nixpkgs

[Klaas van Schelven]

Hello,

I'm running a NixOS setup without channels, and with a locally installed checkout of nixpkgs. 

This makes contributing changes to nixpkgs easier, and allows for more explicit control of upgrades on the underlying channel, i.e. those happen precisely when I do a git pull on my local clone.

Rebuilding my system is then done like so:

nixos-rebuild switch -I nixpkgs=path-to-git-repo

I can't manage to figure out how to get nix-env to work in this setup though. 

Example:

nix-env -i bash -I nixpkgs=path-to-git-repo

error: selector ‘bash’ matches no derivations

Thanks,

Klaas

[Linus Heckemann]

Hi Klaas,

Try nix-env -f path-to-git-repo -iA bash.

Linus

[Matthew O'Gorman]

You are looking for  nix-env -f ${path-to-git-repo} -i bash

for more info

https://nixos.org/nixos/manual/index.html#sec-getting-sources

Good luck

Mog

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[Klaas van Schelven]

Thanks Linus & Matthew!

[Peter Simons]

Hi Klaas,

> nix-env -i bash -I nixpkgs=path-to-git-repo
> error: selector ‘bash’ matches no derivations

I use the following setup:

$ cd $HOME
$ rm -r .nix-defexpr
$ git clone git://github.com/NixOS/nixpkgs.git .nix-defexpr

Now ensure that

NIX_PATH="nixpkgs=$HOME/.nix-defexpr"

is set (i.e. in your ~/.bashrc), and then all Nix commands will use your
local checkout without further ado.

Best regards,
Peter