addNuGetDeps: support loading JSON lockfiles

In addition to loading nix lockfiles

doc/languages-frameworks/dotnet.section.md

@@ -93,7 +93,7 @@ The `dotnetCorePackages.sdk` contains both a runtime and the full sdk of a given
 To package Dotnet applications, you can use `buildDotnetModule`. This has similar arguments to `stdenv.mkDerivation`, with the following additions:
 
 * `projectFile` is used for specifying the dotnet project file, relative to the source root. These have `.sln` (entire solution) or `.csproj` (single project) file extensions. This can be a list of multiple projects as well. When omitted, will attempt to find and build the solution (`.sln`). If running into problems, make sure to set it to a file (or a list of files) with the `.csproj` extension - building applications as entire solutions is not fully supported by the .NET CLI.
-* `nugetDeps` takes either a path to a `deps.nix` file, or a derivation. The `deps.nix` file can be generated using the script attached to `passthru.fetch-deps`. For compatibility, if the argument is a list of derivations, they will be added to `buildInputs`.
+* `nugetDeps` takes a derivation, a list of derivations, or a list of `fetchNupkg` arguments. This can be a nix value, path to a JSON file or path to a nix file. A `deps.nix` file can be generated using the script attached to `passthru.fetch-deps`. All `nugetDeps` packages will be added to `buildInputs`.
 ::: {.note}
 For more detail about managing the `deps.nix` file, see [Generating and updating NuGet dependencies](#generating-and-updating-nuget-dependencies)
 :::

pkgs/build-support/dotnet/add-nuget-deps/default.nix

@@ -11,24 +11,51 @@
 }:
 
 {
+  /**
+    A list of nuget packages.
+
+    Should be a list of derivations or arguments to be applied to `fetchNupkg`.
+
+    ```nix
+    [
+      # Arguments for use fetchNupkg
+      { pname = "FosterFramework"; version = "0.1.15-alpha"; hash = "sha256-lM6eYgOGjl1fx6WFD7rnRi/YAQieM0mx60h0p5dr+l8="; }
+
+      # Or a derivation
+      (fetchNupkg { pname = "Microsoft.AspNetCore.App.Runtime.linux-x64"; version = "8.0.1"; hash = "sha256-QbUQXjCzr8j8u/5X0af9jE++EugdoxMhT08F49MZX74="; })
+    ]
+    ```
+
+    Either a JSON or nix file with the same structure can also be used.
+  */
   nugetDeps,
   overrideFetchAttrs ? x: { },
 }:
 fnOrAttrs: finalAttrs:
 let
   attrs = if builtins.isFunction fnOrAttrs then fnOrAttrs finalAttrs else fnOrAttrs;
 
-  deps =
-    if (nugetDeps != null) then
-      if lib.isDerivation nugetDeps then
-        [ nugetDeps ]
-      else if lib.isList nugetDeps then
-        nugetDeps
-      else
-        assert (lib.isPath nugetDeps);
-        callPackage nugetDeps { fetchNuGet = fetchNupkg; }
+  callNupkg = pkg: if lib.isDerivation pkg then pkg else fetchNupkg pkg;
+
+  loadDeps =
+    x:
+    if x == null then
+      [ ]
+    else if lib.isDerivation x then
+      [ x ]
+    else if builtins.isList x then
+      builtins.map callNupkg x
     else
-      [ ];
+      loadDeps (
+        if builtins.isFunction x then
+          callPackage x { fetchNuGet = fetchNupkg; }
+        else if lib.hasSuffix ".json" x then
+          lib.importJSON x
+        else
+          import x
+      );
+
+  deps = loadDeps nugetDeps;
 
   finalPackage = finalAttrs.finalPackage;
 

pkgs/test/dotnet/nuget-deps/default.nix

@@ -38,7 +38,8 @@ mapAttrs
   )
   {
     "null" = null;
-    "file" = ./nuget-deps.nix;
+    "nix-file" = ./nuget-deps.nix;
+    "json-file" = ./nuget-deps.json;
     "derivation" = emptyDirectory;
     "list" = [ emptyDirectory ];
   }

pkgs/test/dotnet/nuget-deps/nuget-deps.json

@@ -0,0 +1 @@
+[]