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Support more types, including builtins

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This commit is contained in:
Michael Peyton Jones 2019-05-23 20:36:18 +01:00 committed by Nicolas Mattia
parent 30f55f14e1
commit 0c48736b06
1 changed files with 26 additions and 4 deletions
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30
nix/sources.nix
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@ -21,9 +21,8 @@ with rec
add a package called "nixpkgs" to your sources.json.
'';
# fetchTarball version that is compatible between all the versions of Nix
builtins_fetchTarball =
# fetchTarball version that is compatible between all the versions of
# Nix
{ url, sha256 }@attrs:
let
inherit (builtins) lessThan nixVersion fetchTarball;
@ -33,6 +32,21 @@ with rec
else
fetchTarball attrs;
# fetchurl version that is compatible between all the versions of Nix
builtins_fetchurl =
{ url, sha256 }@attrs:
let
inherit (builtins) lessThan nixVersion fetchurl;
in
if lessThan nixVersion "1.12" then
fetchurl { inherit url; }
else
fetchurl attrs;
# A wrapper around pkgs.fetchzip that has inspectable arguments,
# annoyingly this means we have to specify them
fetchzip = { url, sha256 }@attrs: pkgs.fetchzip attrs;
hasNixpkgsPath = (builtins.tryEval <nixpkgs>).success;
hasThisAsNixpkgsPath =
(builtins.tryEval <nixpkgs>).success && <nixpkgs> == ./.;
@ -43,14 +57,22 @@ with rec
(f: set: with builtins;
listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set)));
# borrowed from nixpkgs
functionArgs = f: f.__functionArgs or (builtins.functionArgs f);
callFunctionWith = autoArgs: f: args:
let auto = builtins.intersectAttrs (functionArgs f) autoArgs;
in f (auto // args);
getFetcher = spec:
let fetcherName =
if builtins.hasAttr "type" spec
then builtins.getAttr "type" spec
else "tarball";
in builtins.getAttr fetcherName {
"tarball" = pkgs.fetchzip;
"tarball" = fetchzip;
"builtin-tarball" = builtins_fetchTarball;
"file" = pkgs.fetchurl;
"builtin-url" = builtins_fetchurl;
};
};
# NOTE: spec must _not_ have an "outPath" attribute
@ -62,6 +84,6 @@ mapAttrs (_: spec:
if builtins.hasAttr "url" spec && builtins.hasAttr "sha256" spec
then
spec //
{ outPath = getFetcher spec { inherit (spec) url sha256; } ; }
{ outPath = callFunctionWith spec (getFetcher spec) { }; }
else spec
) sources