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Fix sources.nix for empty and ./. <nixpkgs>

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This commit is contained in:
Nicolas Mattia 2019-04-07 19:56:40 +02:00
parent af92a311c9
commit 3cd02da1ce
1 changed files with 48 additions and 10 deletions
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58
nix/sources.nix
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@ -1,20 +1,58 @@
# This file has been generated by Niv.
# A record, from name to path, of the third-party packages
with
with rec
{
pkgs =
if hasNixpkgsPath
then
if hasThisAsNixpkgsPath
then import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) {}
else import <nixpkgs> {}
else
import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) {};
sources_nixpkgs =
if builtins.hasAttr "nixpkgs" sources
then sources.nixpkgs
else abort
''
Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
add a package called "nixpkgs" to your sources.json.
'';
builtins_fetchTarball =
# fetchTarball version that is compatible between all the versions of
# Nix
{ url, sha256 }@attrs:
let
inherit (builtins) lessThan nixVersion fetchTarball;
in
if lessThan nixVersion "1.12" then
fetchTarball { inherit url; }
else
fetchTarball attrs;
hasNixpkgsPath = (builtins.tryEval <nixpkgs>).success;
hasThisAsNixpkgsPath =
(builtins.tryEval <nixpkgs>).success && <nixpkgs> == ./.;
sources = builtins.fromJSON (builtins.readFile ./sources.json);
# fetchTarball version that is compatible between all the sources of Nix
fetchTarball =
{ url, sha256 }:
if builtins.lessThan builtins.nixVersion "1.12" then
builtins.fetchTarball { inherit url; }
else
builtins.fetchTarball { inherit url sha256; };
mapAttrs = builtins.mapAttrs or
(f: set: with builtins;
listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set)));
};
getFetcher = spec:
let fetcherName =
if builtins.hasAttr "type" spec
then builtins.getAttr "type" spec
else "tarball";
in builtins.getAttr fetcherName {
"tarball" = pkgs.fetchzip;
"file" = pkgs.fetchurl;
};
};
# NOTE: spec must _not_ have an "outPath" attribute
mapAttrs (_: spec:
if builtins.hasAttr "outPath" spec
@ -24,6 +62,6 @@ mapAttrs (_: spec:
if builtins.hasAttr "url" spec && builtins.hasAttr "sha256" spec
then
spec //
{ outPath = fetchTarball { inherit (spec) url sha256; } ; }
{ outPath = getFetcher spec { inherit (spec) url sha256; } ; }
else spec
) sources