updating niv version

nix/sources.nix

@@ -6,13 +6,13 @@ let
   # The fetchers. fetch_<type> fetches specs of type <type>.
   #
 
-  fetch_file = spec:
+  fetch_file = pkgs: spec:
     if spec.builtin or true then
       builtins_fetchurl { inherit (spec) url sha256; }
     else
       pkgs.fetchurl { inherit (spec) url sha256; };
 
-  fetch_tarball = spec:
+  fetch_tarball = pkgs: spec:
     if spec.builtin or true then
       builtins_fetchTarball { inherit (spec) url sha256; }
     else
@@ -43,46 +43,36 @@ let
       ''
       (builtins_fetchurl { inherit (spec) url sha256; });
 
-  #
-  # The sources to fetch.
-  #
-
-  sources = builtins.fromJSON (builtins.readFile ./sources.json);
-
   #
   # Various helpers
   #
 
   # The set of packages used when specs are fetched using non-builtins.
-  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 =
+  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 sources.nixpkgs
-    else abort
+      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.
           '';
 
-  hasNixpkgsPath = (builtins.tryEval <nixpkgs>).success;
-  hasThisAsNixpkgsPath =
-    (builtins.tryEval <nixpkgs>).success && <nixpkgs> == ./.;
-
   # The actual fetching function.
-  fetch = name: spec:
+  fetch = pkgs: name: spec:
 
     if ! builtins.hasAttr "type" spec then
       abort "ERROR: niv spec ${name} does not have a 'type' attribute"
-    else if spec.type == "file" then fetch_file spec
-    else if spec.type == "tarball" then fetch_tarball spec
+    else if spec.type == "file" then fetch_file pkgs spec
+    else if spec.type == "tarball" then fetch_tarball pkgs spec
     else if spec.type == "git" then fetch_git spec
     else if spec.type == "builtin-tarball" then fetch_builtin-tarball spec
     else if spec.type == "builtin-url" then fetch_builtin-url spec
@@ -117,12 +107,28 @@ let
       else
         fetchurl attrs;
 
-in
-mapAttrs (
+  # Create the final "sources" from the config
+  mkSources = config:
+    mapAttrs (
       name: spec:
         if builtins.hasAttr "outPath" spec
         then abort
           "The values in sources.json should not have an 'outPath' attribute"
         else
-      spec // { outPath = fetch name spec; }
-) sources
+          spec // { outPath = fetch config.pkgs name spec; }
+    ) config.sources;
+
+  # The "config" used by the fetchers
+  mkConfig =
+    { sourcesFile ? ./sources.json
+    , sources ? builtins.fromJSON (builtins.readFile sourcesFile)
+    , pkgs ? mkPkgs sources
+    }: rec {
+      # The sources, i.e. the attribute set of spec name to spec
+      inherit sources;
+
+      # The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
+      inherit pkgs;
+    };
+in
+mkSources (mkConfig {}) // { __functor = _: settings: mkSources (mkConfig settings); }