core/pkgs/build-support/fetchurl/default.nix

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2024-05-02 00:46:19 +00:00
{ lib, buildPackages ? { inherit stdenvNoCC; }, stdenvNoCC
, curl # Note that `curl' may be `null', in case of the native stdenvNoCC.
, cacert ? null }:
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 =
buildPackages.stdenvNoCC.mkDerivation ({
name = "mirrors-list";
strictDeps = true;
builder = ./write-mirror-list.sh;
preferLocalBuild = true;
} // mirrors);
# Names of the master sites that are mirrored (i.e., "sourceforge",
# "gnu", etc.).
sites = builtins.attrNames mirrors;
impureEnvVars = lib.fetchers.proxyImpureEnvVars ++ [
# This variable allows the user to pass additional options to curl
"NIX_CURL_FLAGS"
# This variable allows the user to override hashedMirrors from the
# command-line.
"NIX_HASHED_MIRRORS"
# This variable allows overriding the timeout for connecting to
# the hashed mirrors.
"NIX_CONNECT_TIMEOUT"
] ++ (map (site: "NIX_MIRRORS_${site}") sites);
in
{ # URL to fetch.
url ? ""
, # Alternatively, a list of URLs specifying alternative download
# locations. They are tried in order.
urls ? []
, # Additional curl options needed for the download to succeed.
# Warning: Each space (no matter the escaping) will start a new argument.
# If you wish to pass arguments with spaces, use `curlOptsList`
curlOpts ? ""
, # Additional curl options needed for the download to succeed.
curlOptsList ? []
, # Name of the file. If empty, use the basename of `url' (or of the
# first element of `urls').
name ? ""
# for versioned downloads optionally take pname + version.
, pname ? ""
, version ? ""
, # SRI hash.
hash ? ""
, # Legacy ways of specifying the hash.
outputHash ? ""
, outputHashAlgo ? ""
, sha1 ? ""
, sha256 ? ""
, sha512 ? ""
, recursiveHash ? false
, # Shell code to build a netrc file for BASIC auth
netrcPhase ? null
, # Impure env vars (https://nixos.org/nix/manual/#sec-advanced-attributes)
# needed for netrcPhase
netrcImpureEnvVars ? []
, # Shell code executed after the file has been fetched
# successfully. This can do things like check or transform the file.
postFetch ? ""
, # Whether to download to a temporary path rather than $out. Useful
# in conjunction with postFetch. The location of the temporary file
# is communicated to postFetch via $downloadedFile.
downloadToTemp ? false
, # If true, set executable bit on downloaded file
executable ? false
, # If set, don't download the file, but write a list of all possible
# URLs (resulting from resolving mirror:// URLs) to $out.
showURLs ? false
, # Meta information, if any.
meta ? {}
# Passthru information, if any.
, passthru ? {}
# Doing the download on a remote machine just duplicates network
# traffic, so don't do that by default
, preferLocalBuild ? true
# Additional packages needed as part of a fetch
, nativeBuildInputs ? [ ]
}:
let
urls_ =
if urls != [] && url == "" then
(if lib.isList urls then urls
else throw "`urls` is not a list")
else if urls == [] && url != "" then
(if lib.isString url then [url]
else throw "`url` is not a string")
else throw "fetchurl requires either `url` or `urls` to be set";
hash_ =
if with lib.lists; length (filter (s: s != "") [ hash outputHash sha1 sha256 sha512 ]) > 1
then throw "multiple hashes passed to fetchurl" else
if hash != "" then { outputHashAlgo = null; outputHash = hash; }
else if outputHash != "" then
if outputHashAlgo != "" then { inherit outputHashAlgo outputHash; }
else throw "fetchurl was passed outputHash without outputHashAlgo"
else if sha512 != "" then { outputHashAlgo = "sha512"; outputHash = sha512; }
else if sha256 != "" then { outputHashAlgo = "sha256"; outputHash = sha256; }
else if sha1 != "" then { outputHashAlgo = "sha1"; outputHash = sha1; }
else if cacert != null then { outputHashAlgo = "sha256"; outputHash = ""; }
else throw "fetchurl requires a hash for fixed-output derivation: ${lib.concatStringsSep ", " urls_}";
in
assert (lib.isList curlOpts) -> lib.warn ''
fetchurl for ${toString (builtins.head urls_)}: curlOpts is a list (${lib.generators.toPretty { multiline = false; } curlOpts}), which is not supported anymore.
- If you wish to get the same effect as before, for elements with spaces (even if escaped) to expand to multiple curl arguments, use a string argument instead:
curlOpts = ${lib.strings.escapeNixString (toString curlOpts)};
- If you wish for each list element to be passed as a separate curl argument, allowing arguments to contain spaces, use curlOptsList instead:
curlOptsList = [ ${lib.concatMapStringsSep " " lib.strings.escapeNixString curlOpts} ];'' true;
stdenvNoCC.mkDerivation ((
if (pname != "" && version != "") then
{ inherit pname version; }
else
{ name =
if showURLs then "urls"
else if name != "" then name
else baseNameOf (toString (builtins.head urls_));
}
) // {
builder = ./builder.sh;
nativeBuildInputs = [ curl ] ++ nativeBuildInputs;
urls = urls_;
# If set, prefer the content-addressable mirrors
# (http://tarballs.nixos.org) over the original URLs.
preferHashedMirrors = true;
# New-style output content requirements.
inherit (hash_) outputHashAlgo outputHash;
SSL_CERT_FILE = if (hash_.outputHash == "" || hash_.outputHash == lib.fakeSha256 || hash_.outputHash == lib.fakeSha512 || hash_.outputHash == lib.fakeHash)
then "${cacert}/etc/ssl/certs/ca-bundle.crt"
else "/no-cert-file.crt";
outputHashMode = if (recursiveHash || executable) then "recursive" else "flat";
inherit curlOpts;
curlOptsList = lib.escapeShellArgs curlOptsList;
inherit showURLs mirrorsFile postFetch downloadToTemp executable;
impureEnvVars = impureEnvVars ++ netrcImpureEnvVars;
nixpkgsVersion = lib.trivial.release;
inherit preferLocalBuild;
postHook = if netrcPhase == null then null else ''
${netrcPhase}
curlOpts="$curlOpts --netrc-file $PWD/netrc"
'';
inherit meta;
passthru = { inherit url; } // passthru;
})