nixpkgs/pkgs/build-support/fetchurl/write-mirror-list.sh

source $stdenv/setup

# !!! this is kinda hacky.
set | grep -E '^[a-zA-Z]+=.*://' > $out
* Write the list of mirrors to a file that we can reuse between fetchurl instantiations, instead of passing the mirrors to fetchurl instantiations via environment variables. This makes the resulting store derivations (.drv files) much smaller, which in turn makes nix-env/nix-instantiate faster (4.8 -> 4.2 seconds on nix-env -qa --out-path). svn path=/nixpkgs/trunk/; revision=12695 2008-08-22 16:53:21 +01:00			`source $stdenv/setup`

			`# !!! this is kinda hacky.`
fetchurl: change to grep -E to fix #8561 Close #21861. 2017-01-13 18:05:10 +00:00			`set \| grep -E '^[a-zA-Z]+=.*://' > $out`