lix/corepkgs/fetchurl.nix

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with import <nix/config.nix>;
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# Argh, this thing is duplicated (more-or-less) in Nixpkgs. Need to
# find a way to combine them.
{system ? builtins.currentSystem, url, outputHash ? "", outputHashAlgo ? "", md5 ? "", sha1 ? "", sha256 ? ""}:
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assert (outputHash != "" && outputHashAlgo != "")
|| md5 != "" || sha1 != "" || sha256 != "";
derivation {
name = baseNameOf (toString url);
builder = shell;
args = [ "-e" ./fetchurl.sh ];
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# Compatibility with Nix <= 0.7.
id = md5;
# New-style output content requirements.
outputHashAlgo = if outputHashAlgo != "" then outputHashAlgo else
if sha256 != "" then "sha256" else if sha1 != "" then "sha1" else "md5";
outputHash = if outputHash != "" then outputHash else
if sha256 != "" then sha256 else if sha1 != "" then sha1 else md5;
inherit system url curl;
# No need to double the amount of network traffic
preferLocalBuild = true;
# Don't build in a chroot because Nix's dependencies may not be there.
__noChroot = true;
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}