nixpkgs/pkgs/build-support/fetchurl/boot.nix
2024-09-25 14:51:53 -03:00

35 lines
661 B
Nix

let
mirrors = import ./mirrors.nix;
in
{ system }:
{
url ? builtins.head urls,
urls ? [ ],
sha256 ? "",
hash ? "",
name ? baseNameOf (toString url),
}:
# assert exactly one hash is set
assert hash != "" || sha256 != "";
assert hash != "" -> sha256 == "";
import <nix/fetchurl.nix> {
inherit
system
hash
sha256
name
;
url =
# Handle mirror:// URIs. Since <nix/fetchurl.nix> currently
# supports only one URI, use the first listed mirror.
let
m = builtins.match "mirror://([a-z]+)/(.*)" url;
in
if m == null then url else builtins.head (mirrors.${builtins.elemAt m 0}) + (builtins.elemAt m 1);
}