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This commit is contained in:
Nicolas Mattia 2020-01-17 15:32:08 +01:00
parent 61b61d1e5f
commit 506b896788
1 changed files with 22 additions and 18 deletions
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40
nix/sources.nix
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@ -49,22 +49,26 @@ let
# The set of packages used when specs are fetched using non-builtins.
mkPkgs = sources:
let
sourcesNixpkgs =
import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) {};
hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
hasThisAsNixpkgsPath = <nixpkgs> == ./.;
in
if builtins.hasAttr "nixpkgs" sources
then sourcesNixpkgs
else if hasNixpkgsPath && ! hasThisAsNixpkgsPath then
import <nixpkgs> {}
else
abort
''
Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
add a package called "nixpkgs" to your sources.json.
'';
if hasNixpkgsPath
then
if hasThisAsNixpkgsPath
then import (builtins_fetchTarball { inherit (mkNixpkgs sources) url sha256; }) {}
else import <nixpkgs> {}
else
import (builtins_fetchTarball { inherit (mkNixpkgs sources) url sha256; }) {};
mkNixpkgs = sources:
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.
'';
hasNixpkgsPath = (builtins.tryEval <nixpkgs>).success;
hasThisAsNixpkgsPath =
(builtins.tryEval <nixpkgs>).success && <nixpkgs> == ./.;
# The actual fetching function.
fetch = pkgs: name: spec:
@ -120,8 +124,8 @@ let
# The "config" used by the fetchers
mkConfig =
{ sourcesFile ? ./sources.json
, sources ? builtins.fromJSON (builtins.readFile sourcesFile)
{ sourcesFile ? if builtins.pathExists ./sources.json then ./sources.json else null
, sources ? if isNull sourcesFile then {} else builtins.fromJSON (builtins.readFile sourcesFile)
, pkgs ? mkPkgs sources
}: rec {
# The sources, i.e. the attribute set of spec name to spec