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{stdenv, curl, writeScript}: # Note that `curl' may be `null', in case of the native stdenv.
let
mirrors = import ./mirrors.nix;
# Write the list of mirrors to a file that we can reuse between
# fetchurl instantiations, instead of passing the mirrors to
# fetchurl instantiations via environment variables. This makes the
# resulting store derivations (.drv files) much smaller, which in
# turn makes nix-env/nix-instantiate faster.
mirrorsFile =
stdenv.mkDerivation ({
name = "mirrors-list";
builder = ./write-mirror-list.sh;
} // mirrors);
# Names of the master sites that are mirrored (i.e., "sourceforge",
# "gnu", etc.).
sites =
if builtins ? attrNames
then builtins.attrNames mirrors
else [] /* backwards compatibility */;
in
{ # URL to fetch.
url ? ""
, # Alternatively, a list of URLs specifying alternative download
# locations. They are tried in order.
urls ? []
, # Name of the file. If empty, use the basename of `url' (or of the
# first element of `urls').
name ? ""
# Different ways of specifying the hash.
, outputHash ? ""
, outputHashAlgo ? ""
, md5 ? ""
, sha1 ? ""
, sha256 ? ""
, # If set, don't download the file, but write a list of all possible
# URLs (resulting from resolving mirror:// URLs) to $out.
showURLs ? false
, # If set, down't download file but tell user how to download it.
restricted ? false
, # Used only if restricted. Should contain instructions how to fetch the file.
message ? ""
}:
assert urls != [] -> url == "";
assert url != "" -> urls == [];
assert showURLs || (outputHash != "" && outputHashAlgo != "")
|| md5 != "" || sha1 != "" || sha256 != "";
let
urls_ = if urls != [] then urls else [url];
name_ = if showURLs then "urls"
else if name != "" then name
else baseNameOf (toString (builtins.head urls_));
hashAlgo_ = if outputHashAlgo != "" then outputHashAlgo else
if sha256 != "" then "sha256" else if sha1 != "" then "sha1" else "md5";
hash_ = if outputHash != "" then outputHash else
if sha256 != "" then sha256 else if sha1 != "" then sha1 else md5;
in
stdenv.mkDerivation ({
name = name_;
outputHashAlgo = hashAlgo_;
outputHash = hash_;
urls = urls_;
# Compatibility with Nix <= 0.7.
id = md5;
inherit showURLs mirrorsFile;
}
// (if (!showURLs && restricted) then rec {
builder = writeScript "restrict-message" ''
source ${stdenv}/setup
cat <<_EOF_
${message_}
_EOF_
'';
message_ = if message != "" then message else ''
You have to download ${name_} from ${stdenv.lib.concatStringsSep " " urls_} yourself,
and add it to the store using either
nix-store --add-fixed ${hashAlgo_} ${name_}
or
${if hashAlgo_ != "sha256" then "NIX_HASH_ALGO=${hashAlgo_} " else
""}nix-prefetch-url file://path/to/${name_}
'';
}
else {
builder = ./builder.sh;
buildInputs = [curl];
# If set, prefer the content-addressable mirrors
# (http://nixos.org/tarballs) over the original URLs.
preferHashedMirrors = true;
# New-style output content requirements.
impureEnvVars = [
# We borrow these environment variables from the caller to allow
# easy proxy configuration. This is impure, but a fixed-output
# derivation like fetchurl is allowed to do so since its result is
# by definition pure.
"http_proxy" "https_proxy" "ftp_proxy" "all_proxy" "no_proxy"
# This variable allows the user to override hashedMirrors from the
# command-line.
"NIX_HASHED_MIRRORS"
] ++ (map (site: "NIX_MIRRORS_${site}") sites);
})
)
|