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