buildDotnetModule: support optional nupkg packing

doc/languages-frameworks/dotnet.section.md

@@ -73,6 +73,7 @@ To package Dotnet applications, you can use `buildDotnetModule`. This has simila
 
 * `projectFile` has to be used for specifying the dotnet project file relative to the source root. These usually have `.sln` or `.csproj` file extensions. This can be an array of multiple projects as well.
 * `nugetDeps` has to be used to specify the NuGet dependency file. Unfortunately, these cannot be deterministically fetched without a lockfile. This file should be generated using `nuget-to-nix` tool, which is available in nixpkgs.
+* `packNupkg` is used to pack project as a `nupkg`, and installs it to `$out/share`. If set to `true`, the derivation can be used as a dependency for another dotnet project by adding it to `projectReferences`.
 * `executables` is used to specify which executables get wrapped to `$out/bin`, relative to `$out/lib/$pname`. If this is unset, all executables generated will get installed. If you do not want to install any, set this to `[]`.
 * `runtimeDeps` is used to wrap libraries into `LD_LIBRARY_PATH`. This is how dotnet usually handles runtime dependencies.
 * `buildType` is used to change the type of build. Possible values are `Release`, `Debug`, etc. By default, this is set to `Release`.
@@ -83,8 +84,9 @@ To package Dotnet applications, you can use `buildDotnetModule`. This has simila
 * `disabledTests` is used to disable running specific unit tests. This gets passed as: `dotnet test --filter "FullyQualifiedName!={}"`, to ensure compatibility with all unit test frameworks.
 * `dotnetRestoreFlags` can be used to pass flags to `dotnet restore`.
 * `dotnetBuildFlags` can be used to pass flags to `dotnet build`.
-* `dotnetTestFlags` can be used to pass flags to `dotnet test`.
+* `dotnetTestFlags` can be used to pass flags to `dotnet test`. Used only if `doCheck` is set to `true`.
 * `dotnetInstallFlags` can be used to pass flags to `dotnet install`.
+* `dotnetPackFlags` can be used to pass flags to `dotnet pack`. Used only if `packNupkg` is set to `true`.
 * `dotnetFlags` can be used to pass flags to all of the above phases.
 
 Here is an example `default.nix`, using some of the previously discussed arguments:
@@ -107,6 +109,8 @@ buildDotnetModule rec {
   executables = [ "foo" ]; # This wraps "$out/lib/$pname/foo" to `$out/bin/foo`.
   executables = []; # Don't install any executables.
 
+  packNupkg = true; # This packs the project as "foo-0.1.nupkg" at `$out/share`.
+
   runtimeDeps = [ ffmpeg ]; # This will wrap ffmpeg's library path into `LD_LIBRARY_PATH`.
 }
 ```

pkgs/build-support/build-dotnet-module/default.nix

@@ -14,6 +14,8 @@
 , dotnetTestFlags ? []
 # Flags to pass to `dotnet install`.
 , dotnetInstallFlags ? []
+# Flags to pass to `dotnet pack`.
+, dotnetPackFlags ? []
 # Flags to pass to dotnet in all phases.
 , dotnetFlags ? []
 
@@ -21,6 +23,8 @@
 # Unfortunately, dotnet has no method for doing this automatically.
 # If unset, all executables in the projects root will get installed. This may cause bloat!
 , executables ? null
+# Packs a project as a `nupkg`, and installs it to `$out/share`. If set to `true`, the derivation can be used as a dependency for another dotnet project by adding it to `projectReferences`.
+, packNupkg ? false
 # The packages project file, which contains instructions on how to compile it. This can be an array of multiple project files as well.
 , projectFile ? null
 # The NuGet dependency file. This locks all NuGet dependency versions, as otherwise they cannot be deterministically fetched.
@@ -167,7 +171,18 @@ let
           "''${dotnetInstallFlags[@]}"  \
           "''${dotnetFlags[@]}"
       done
-    '' + (if executables != null then ''
+    '' + (lib.optionalString packNupkg ''
+      for project in ''${projectFile[@]}; do
+        dotnet pack "$project" \
+          -p:ContinuousIntegrationBuild=true \
+          -p:Deterministic=true \
+          --output $out/share \
+          --configuration "$buildType" \
+          --no-build \
+          "''${dotnetPackFlags[@]}"  \
+          "''${dotnetFlags[@]}"
+      done
+    '') + (if executables != null then ''
       for executable in $executables; do
         execPath="$out/lib/${args.pname}/$executable"