[Nix-dev] How do I ...

[Pjotr Prins]

I upgraded to nix nix-env --version

  nix-env (Nix) 0.12pre12824

now I do:

  nix-env -i git

and get:

  replacing old `git-1.5.6.2'
  Aborted

This is baffling.

Pj.

On Tue, Sep 23, 2008 at 11:09:03AM +0200, Marc Weber wrote:
> On Tue, Sep 23, 2008 at 10:03:39AM +0200, Pjotr Prins wrote:
> > Hi Everyone,
> > 
> > Thanks for the replies - it is heartening as I was getting a bit
> > desperate I would get any help through the mailing list. I am not much
> > of an IRC lover, but maybe I should change that.
> > 
> > There were too many variables and the manual gave the wrong
> > information. It suggests you can use the command line. What I tried
> > was having a config.nix in my packages dir - thinking that nix-env -f
> > . would pick that up. It does *something* because if I put in a syntax
> > error Nix will balk. Another problem may be that the package does not
> > get rebuilt - after changing the parameter. I don't know, but I'll try
> > ./.nix-pkgs/config.nix first, next force the package to get rebuilt
> > (how does one do that?), and if that fails upgrade Nix to a later
> > version.
> That's a task nix will figure out itself, why?
> The configuration parameters will be build inputs.
> The hash is calculated out of the build inputs which are passed as env
> vars to the builder. If nix doesn't findan already realized path in
> /nix/store with the given hash it falls back to building it by default.
> So just chaning the config options is enough.
> 
> There are some rare cases nix didn't figure it out for me.
> Eg when using
> src = ./local.tar.gz and changing that local.tar.gz.
> In these cases I added a dummy=0; to the derivation. Each time I wanted
> to force a rebuild I've incremented it. But this should not be necessary
> in your case.
> 
> Marc
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