Baby step #2b; adding arguments to the script


When reading section 15.4 of nix Package Manager Guide it talks about passing parameters to the builder script.
So I tried it:-)

#atrTest.nix with args
  pkgs = import <nixpkgs> {};

pkgs.stdenv.mkDerivation rec {
		name = "atrTest-0.0.1";
		args = ["-run 2"];
		builder = ./;
		src = ./makefile;
		extraStuff = "extra stuff${name} for shell";
		buildInputs = [pkgs.tree];
		postInstall = ''
	mkdir ''${out}/Assets
	echo "all done now running postInstall for ${name}" > ''${out}/Assets/log.txt

When I added the args attribute to the argument list of mkDerivation, I received the folowing infelicity;

nix-build -K atrTest.nix
these derivations will be built:
building '/nix/store/ppr4ip18g4xm0nkbrpr08l4jcvf06jy4-atrTest-0.0.1.drv'...
bash: - : invalid option
Usage:  bash [GNU long option] [option] ...
        bash [GNU long option] [option] script-file ...
GNU long options:


ption         (invocation only)
        -abefhkmnptuvxBCHP or -o option
note: keeping build directory '/tmp/nix-build-atrTest-0.0.1.drv-8'
builder for '/nix/store/ppr4ip18g4xm0nkbrpr08l4jcvf06jy4-atrTest-0.0.1.drv' failed with exit code 2
error: build of '/nix/store/ppr4ip18g4xm0nkbrpr08l4jcvf06jy4-atrTest-0.0.1.drv' failed

I was expecting that my builder script would be called with the args -run 2.
Instead it looks like bash was called with the arguments. While this might be useful
in some use cases, the ability to pass arguments to my builder script also
seems useful.

I did try it as a list of 2 arguments, ["run" "2"] but it didnt like that either.

This brings up a couple of salient points:

  1. the manual’s description and the actual behavior seem to be inconsistent.
  2. How do I pass arguments to the builder script?

Just as a side note, I’d like to recommend that formal documentation follow RFC2119. This specification
described the use of words like should and shall. The nix manual says

The optional attribute args specifies command-line arguments to be passed to the builder. It should be a list.

When I tried adding the args attribute as a string I got an error. It seems that it MUST be a list. Its a minor point but, IMHO, the intent of RFC2119 is a good one and easy to follow. Further discussion is provided at microformats. Its an easy read and only covers 5 words and how to use them.

So my question is; how do I specify parameters to be passed to my builder script?


The thing you missed is that the nix manual is describing derivarion function but you are using more high level mkDerivation function from nixpkgs which follows different rules.


The “different rules” link is not working for me


it is not a link

<a>different rules</a>

&&/or it points to nothing

if you look at the topic in a text mode browser
or disable scripts && css
it is just plain text


Hmm, discourse must have botched my e-mail reply. Fixed now.

Links sent from email do not link

i thought you where just encouraging people to do there own research ! lol