So I've started playing with Nix. I am trying to build an environment with R and some packages installed (inside Docker, just to avoid interfering with my system). Here is the default.nix that I'm using:

with import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/e11142026e2cef35ea52c9205703823df225c947.tar.gz") {};
{
  myProject = stdenv.mkDerivation {
    name = "myProject";
    version = "1";
    src = if lib.inNixShell then null else nix;

    buildInputs = with rPackages; [
      R
      ggplot2
      knitr
    ];
  };
}

but when I try to build the environment first, and then drop into bash that doesn't work. So when I do

but when I try to build the environment first, and then drop into bash that doesn't work. So when I do

but when I try to build the environment first, and then drop into bash that doesn't work. So when I do

RUN nix-build /home/renv/default.nix
CMD ["bash"]

I get following error message

builder for '/nix/store/1csmqrnlgbyzm5kkjw2s9q348qpx3rqy-myProject.drv' failed to produce output path for output 'out' at '/nix/store/icf4fsmlcalyc2v5wiwn88x6f7xab46y-myProject'

but when I try to build the environment first, and then drop into bash that doesn't work. So when I do

RUN nix-build /home/renv/default.nix
CMD ["bash"]

I get following error message

112.8 unpacking sources
112.8 unpacking source archive /nix/store/2zdq28c97x3rqb7fqrrvwkdzh44pdq05-nix-2.13.3
113.0 source root is nix-2.13.3
113.0 patching sources
113.0 configuring
113.1 no configure script, doing nothing
113.1 building
113.1 no Makefile or custom buildPhase, doing nothing
113.1 installing
113.1 no Makefile or custom installPhase, doing nothing
113.1 post-installation fixup
113.4 error: builder for '/nix/store/1csmqrnlgbyzm5kkjw2s9q348qpx3rqy-myProject.drv' failed to produce output path for output 'out' at '/nix/store/icf4fsmlcalyc2v5wiwn88x6f7xab46y-myProject'

ok so some more googling led me to write this default.nix:

ok so some more googling led me to write this default.nix:

{ pkgs ? import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/e11142026e2cef35ea52c9205703823df225c947.tar.gz") {} }:

with pkgs;

let
  my-pkgs = rWrapper.override {
    packages = with rPackages; [ dplyr ggplot2 R];
  };
in
mkShell {
  buildInputs = [my-pkgs];
}

In reply to @brodriguesco:matrix.org
I guess the issue was that before I wasn't creating an environment, because I wasn't using mkShell explicitely?