nixpkgs/pkgs/build-support/prefer-remote-fetch/default.nix

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# An overlay that download sources on remote builder.
# This is useful when the evaluating machine has a slow
# upload while the builder can fetch faster directly from the source.
# Usage: Put the following snippet in your usual overlay definition:
#
# self: super:
# (super.prefer-remote-fetch self super)
# Full configuration example for your own account:
#
# $ mkdir ~/.config/nixpkgs/overlays/
# $ echo 'self: super: super.prefer-remote-fetch self super' > ~/.config/nixpkgs/overlays/prefer-remote-fetch.nix
#
self: super: {
fetchurl = args: super.fetchurl ({ preferLocalBuild = false; } // args);
fetchgit = args: super.fetchgit ({ preferLocalBuild = false; } // args);
fetchhg = args: super.fetchhg ({ preferLocalBuild = false; } // args);
fetchsvn = args: super.fetchsvn ({ preferLocalBuild = false; } // args);
fetchipfs = args: super.fetchipfs ({ preferLocalBuild = false; } // args);
}