Hi,
On 03/02/2017 08:01 AM, Ganesh Sittampalam wrote:
> I guess that in this case the large tree is the import of the nixpkgs
> tree. Is there any work around or better way to achieve what I want?
The better way is to use builtins.fetchTarball:
with import (fetchTarball {
url = https://github.com/NixOS/nixpkgs/archive/264d42b.tar.gz;
sha256 = "19i77afcns8mf88vkxvm3jvkzdkf5x8p8kxnnivhd9l4kslkq3v5";
}) {};
{
env =
stdenv.mkDerivation rec {
...
};
};
}
This also prevents a double evaluation of Nixpkgs. However, this won't work if
you really need to fetch from a local Git repository. Nix 1.12 has a builtin
fetchgit function that allows you to say
with import (builtins.fetchgit {
url = <nixpkgs>;
rev = "...";
}) {};
...
(I just pushed a fix to allow "url" to refer to paths.)
--
Eelco Dolstra | LogicBlox, Inc. | http://nixos.org/~eelco/
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