buildDartApplication: Link the package_config.json in a separate derivation

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

@@ -51,7 +51,7 @@
 }@args:
 
 let
-  generators = callPackage ./generators.nix { inherit dart; } { inherit sdkSetupScript; buildDrvArgs = args; };
+  generators = callPackage ./generators.nix { inherit dart; } { buildDrvArgs = args; };
 
   generatedDepsList = generators.mkDepsList { inherit pubspecLockFile pubspecLockData packageConfig; };
 
@@ -64,7 +64,7 @@ let
 
   pubspecLockFile = builtins.toJSON pubspecLock;
   pubspecLockData = pub2nix.readPubspecLock { inherit src packageRoot pubspecLock gitHashes sdkSourceBuilders; };
-  packageConfig = pub2nix.generatePackageConfig {
+  packageConfig = generators.linkPackageConfig (pub2nix.generatePackageConfig {
     pname = if args.pname != null then "${args.pname}-${args.version}" else null;
 
     dependencies =
@@ -78,7 +78,7 @@ let
       builtins.concatLists (builtins.attrValues pubspecLockData.dependencies);
 
     inherit (pubspecLockData) dependencySources;
-  };
+  });
 
   inherit (dartHooks.override { inherit dart; }) dartConfigHook dartBuildHook dartInstallHook dartFixupHook;
 

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

@@ -2,18 +2,17 @@
 , stdenvNoCC
 , dart
 , dartHooks
+, jq
 , yq
 , cacert
 }:
 
 {
-  # Commands to run once before using Dart or pub.
-  sdkSetupScript ? ""
   # Arguments used in the derivation that builds the Dart package.
   # Passing these is recommended to ensure that the same steps are made to
   # prepare the sources in both this derivation and the one that builds the Dart
   # package.
-, buildDrvArgs ? { }
+  buildDrvArgs ? { }
 , ...
 }@args:
 
@@ -50,6 +49,24 @@ let
   drvArgs = buildDrvInheritArgs // (removeAttrs args [ "buildDrvArgs" ]);
   name = (if drvArgs ? name then drvArgs.name else "${drvArgs.pname}-${drvArgs.version}");
 
+  # Adds the root package to a dependency package_config.json file from pub2nix.
+  linkPackageConfig = packageConfig: stdenvNoCC.mkDerivation (drvArgs // {
+    name = "${name}-package-config-with-root.json";
+
+    nativeBuildInputs = drvArgs.nativeBuildInputs or [ ] ++ args.nativeBuildInputs or [ ] ++ [ jq yq ];
+
+    dontBuild = true;
+
+    installPhase = ''
+      runHook preInstall
+
+      packageName="$(yq --raw-output .name pubspec.yaml)"
+      jq --arg name "$packageName" '.packages |= . + [{ name: $name, rootUri: "../", packageUri: "lib/" }]' '${packageConfig}' > "$out"
+
+      runHook postInstall
+    '';
+  });
+
   mkDepsDrv = { pubspecLockFile, pubspecLockData, packageConfig }: args: stdenvNoCC.mkDerivation (drvArgs // args // {
     inherit pubspecLockFile packageConfig;
 
@@ -76,5 +93,6 @@ let
 in
 {
   inherit
+    linkPackageConfig
     mkDepsList;
 }

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

@@ -8,8 +8,7 @@ dartConfigHook() {
 
     echo "Installing dependencies"
     mkdir -p .dart_tool
-    packageName="$(@yq@ --raw-output .name pubspec.yaml)"
-    @jq@ '.packages |= . + [{ name: "'"$packageName"'", rootUri: "../", packageUri: "lib/" }]' "$packageConfig" > .dart_tool/package_config.json
+    cp "$packageConfig" .dart_tool/package_config.json
 
     echo "Generating the dependency list"
     dart pub deps --json | @jq@ .packages > deps.json

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

@@ -3,7 +3,6 @@
 {
   dartConfigHook = makeSetupHook {
     name = "dart-config-hook";
-    substitutions.yq = "${yq}/bin/yq";
     substitutions.jq = "${jq}/bin/jq";
   } ./dart-config-hook.sh;
   dartBuildHook = makeSetupHook {