On 05/27/2014 01:52 AM, Mateusz Kowalczyk wrote: > Hi, > > Often I want to package some software. Normally what I do is bring my > nixpkgs checkout up to date, create a new branch from master and write > the expression. > > My problem begins when I set out to try my expression out: if I run > nix-env -i <my package> then nix will go out and try to pull in all the > latest versions of packages as my tree was updated. While technically > that's great and it ensures that my expression builds against what's in > master right now, it's very inconvenient during development of the > expression itself. > > My specific example is that I'm writing an expression which depends on > Qt4 at the moment so when I try to test it, it goes off to try and build > qt4 first (which seems to have been updated somehow). The problem with > this is that qt4 takes many, many hours to build if it builds at all so > I'm currently stuck waiting either for my box to finish building Qt or > for Hydra to finish building it in about 2-3 hours so I can fetch it. > This wait is rather sub-optimal if all I care about is ‘does this > expression build with my current setup?’. If I'm trying to quickly > package something so I can use it 5 minutes later, it's often impossible. > > How can I ask nix to use the packages I already have installed where > possible? I'd rather leave testing of whether it works with current > nixpkgs master for later, when I think I'm done writing the expression. > > Thanks >
I found https://nixos.org/wiki/Create_and_debug_nix_packages which mentions that we can use nixos-version to find out which commit we're at and then work from that. I guess that works. -- Mateusz K. _______________________________________________ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
