buildDotnetModule.fetch-deps: use json lockfiles by default

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

@@ -6,6 +6,7 @@
   substituteAll,
   nuget-to-nix,
   nixfmt-rfc-style,
+  nuget-to-json,
   cacert,
   fetchNupkg,
   callPackage,
@@ -87,8 +88,11 @@ attrs
             src = ./fetch-deps.sh;
             isExecutable = true;
             inherit cacert;
-            nugetToNix = nuget-to-nix;
-            nixfmt = nixfmt-rfc-style;
+            binPath = lib.makeBinPath [
+              nuget-to-nix
+              nixfmt-rfc-style
+              nuget-to-json
+            ];
           };
 
           defaultDepsFile =

pkgs/build-support/dotnet/add-nuget-deps/fetch-deps.sh

@@ -1,13 +1,28 @@
-set -e
+# shellcheck shell=bash
+set -euo pipefail
+
+export PATH="@binPath@:$PATH"
+
+LOCKFILE_OUTPUT="$1"
 
 genericBuild
 
-(
-    echo -e "# This file was automatically generated by passthru.fetch-deps.\n# Please dont edit it manually, your changes might get overwritten!\n"
-    @nugetToNix@/bin/nuget-to-nix "${NUGET_PACKAGES%/}"
-) > deps.nix
+nuget-to-json "${NUGET_PACKAGES%/}" >deps.json
 
-@nixfmt@/bin/nixfmt deps.nix
+if [[ "$LOCKFILE_OUTPUT" == *.nix ]]; then
+    trap 'rm deps.json' exit
 
-mv deps.nix "$1"
-echo "Succesfully wrote lockfile to $1"
+    (
+        echo "# This file was automatically generated by passthru.fetch-deps."
+        echo "# Please dont edit it manually, your changes might get overwritten!"
+        echo -e "# TODO: This format file is obsolete, consider migrating to JSON.\n"
+        nuget-to-nix --convert deps.json
+    ) >deps.nix
+    nixfmt deps.nix
+
+    mv deps.nix "$LOCKFILE_OUTPUT"
+else
+    mv deps.json "$LOCKFILE_OUTPUT"
+fi
+
+echo "Succesfully wrote lockfile to $LOCKFILE_OUTPUT"