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lix/corepkgs/fetchurl.nix

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{ system ? builtins.currentSystem
, url
, md5 ? "", sha1 ? "", sha256 ? "", sha512 ? ""
, outputHash ?
if sha512 != "" then sha512 else if sha1 != "" then sha1 else if md5 != "" then md5 else sha256
, outputHashAlgo ?
if sha512 != "" then "sha512" else if sha1 != "" then "sha1" else if md5 != "" then "md5" else "sha256"
, executable ? false
, unpack ? false
, name ? baseNameOf (toString url)
}:
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derivation {
builder = "builtin:fetchurl";
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# New-style output content requirements.
inherit outputHashAlgo outputHash;
outputHashMode = if unpack || executable then "recursive" else "flat";
inherit name system url executable unpack;
# No need to double the amount of network traffic
preferLocalBuild = true;
impureEnvVars = [
# We borrow these environment variables from the caller to allow
# easy proxy configuration. This is impure, but a fixed-output
# derivation like fetchurl is allowed to do so since its result is
# by definition pure.
"http_proxy" "https_proxy" "ftp_proxy" "all_proxy" "no_proxy"
];
# To make "nix-prefetch-url" work.
urls = [ url ];
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}