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|
{
system ? "", # obsolete
url,
hash ? "", # an SRI hash
# Legacy hash specification
md5 ? "",
sha1 ? "",
sha256 ? "",
sha512 ? "",
outputHash ?
if hash != "" then
hash
else if sha512 != "" then
sha512
else if sha1 != "" then
sha1
else if md5 != "" then
md5
else
sha256,
outputHashAlgo ?
if hash != "" then
""
else if sha512 != "" then
"sha512"
else if sha1 != "" then
"sha1"
else if md5 != "" then
"md5"
else
"sha256",
executable ? false,
unpack ? false,
name ? baseNameOf (toString url),
impure ? false,
}:
derivation (
{
builder = "builtin:fetchurl";
# New-style output content requirements.
outputHashMode = if unpack || executable then "recursive" else "flat";
inherit
name
url
executable
unpack
;
system = "builtin";
# 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 ];
}
// (if impure then { __impure = true; } else { inherit outputHashAlgo outputHash; })
)
|
