Hi,
On 03/04/2011 04:34 PM, Benjamin Franksen wrote:
Eelco Dolstra wrote:
How can I make the pkgs variable visible here?
Add the following line to the top of the file:
{ pkgs, ... }:
Lots of examples of configurations can be found here:
https://svn.nixos.org/repos/nix/configurations/trunk/
Thanks. I looked at these examples and saw such a line but, well... I just
didn't think this could work. I mean, with this addition
/etc/nixos/configuration.nix becomes a function, right? Is there a special
trick that makes nixos interpret the code as either a function or a plain
value?
Yes, there is, which is rather ugly :-) Basically modules are called by
doing
if builtins.isFunction module
then module { ... args ... }
else module
But this is really for backwards compatibility. It's best to always
write modules as functions.
Please forgive my beginner's confusion, I have some problems groking the nix
language (the only functional languages I know are all statically typed).
Indeed we can get away with this only because we don't have static typing.
--
Eelco Dolstra | http://www.st.ewi.tudelft.nl/~dolstra/
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