buildDartApplication: Allow supplying runtime dependencies

pkgs/build-support/dart/build-dart-application/default.nix

@@ -23,6 +23,7 @@
   else if dartOutputType == "js" then "${nodejs}/bin/node"
   else null
 
+, runtimeDependencies ? [ ]
 , pubspecLockFile ? null
 , vendorHash ? ""
 , ...
@@ -39,25 +40,28 @@ let
     buildDrvArgs = args;
     inherit pubGetScript vendorHash pubspecLockFile;
   };
-  inherit (dartHooks.override { inherit dart; }) dartConfigHook dartBuildHook dartInstallHook;
+  inherit (dartHooks.override { inherit dart; }) dartConfigHook dartBuildHook dartInstallHook dartFixupHook;
 in
 assert !(builtins.isString dartOutputType && dartOutputType != "") ->
 throw "dartOutputType must be a non-empty string";
 stdenv.mkDerivation (args // {
   inherit pubGetScript dartCompileCommand dartOutputType dartRuntimeCommand
-    dartCompileFlags dartJitFlags;
+    dartCompileFlags dartJitFlags runtimeDependencies;
 
   dartEntryPoints =
     if (dartEntryPoints != null)
     then writeText "entrypoints.json" (builtins.toJSON dartEntryPoints)
     else null;
 
+  runtimeDependencyLibraryPath = lib.makeLibraryPath runtimeDependencies;
+
   nativeBuildInputs = (args.nativeBuildInputs or [ ]) ++ [
     dart
     dartDeps
     dartConfigHook
     dartBuildHook
     dartInstallHook
+    dartFixupHook
     makeWrapper
   ] ++ lib.optionals stdenv.isDarwin [
     darwin.sigtool

pkgs/build-support/dart/build-dart-application/hooks/dart-fixup-hook.sh

@@ -0,0 +1,21 @@
+# shellcheck shell=bash
+
+dartFixupHook() {
+    echo "Executing dartFixupHook"
+
+    echo "Providing runtime dependencies"
+    if [[ ! -z "$runtimeDependencyLibraryPath" ]]; then
+        # Add runtime library dependencies to the LD_LIBRARY_PATH.
+        # For some reason, the RUNPATH of the executable is not used to load dynamic libraries in dart:ffi with DynamicLibrary.open().
+        #
+        # This could alternatively be fixed with patchelf --add-needed, but this would cause all the libraries to be opened immediately,
+        # which is not what application authors expect.
+        for f in "$out"/bin/*; do
+            wrapProgram "$f" --suffix LD_LIBRARY_PATH : "$runtimeDependencyLibraryPath"
+        done
+    fi
+
+    echo "Finished dartFixupHook"
+}
+
+postFixupHooks+=(dartFixupHook)

pkgs/build-support/dart/build-dart-application/hooks/default.nix

@@ -12,4 +12,7 @@
   dartInstallHook = makeSetupHook {
     name = "dart-install-hook";
   } ./dart-install-hook.sh;
+  dartFixupHook = makeSetupHook {
+    name = "dart-fixup-hook";
+  } ./dart-fixup-hook.sh;
 }