cleanup and check hash

.github/workflows/download_asset.yaml

@@ -45,6 +45,7 @@ jobs:
 
     - run: dart pub get
 
+    # Keep this list consistent with pkgs/native_assets_cli/example/build/download_asset/lib/src/hook_helpers/target_versions.dart
     - name: Build Linux host
       if: matrix.os == 'ubuntu'
       run: |
@@ -86,7 +87,7 @@ jobs:
           pkgs/native_assets_cli/example/build/download_asset/.dart_tool/download_asset/**/*.so
         if-no-files-found: error
 
-  check:
+  release:
     needs: build
     runs-on: ubuntu-latest
 
@@ -108,17 +109,6 @@ jobs:
       - name: Display structure of downloaded assets
         run: ls -R .dart_tool/download_asset/
 
-      # - uses: dart-lang/setup-dart@0a8a0fc875eb934c15d08629302413c671d3f672
-      #   with:
-      #     sdk: stable
-
-      # - run: dart pub get
-
-      # - name: Check hashes of released artifacts
-      #   run: |
-      #     dart tool/generate_asset_hashes.dart
-      #     git diff --exit-code
-
       - name: Release
         uses: softprops/action-gh-release@e7a8f85e1c67a31e6ed99a94b41bd0b71bbee6b8
         if: startsWith(github.ref, 'refs/tags/download_asset-prebuild-assets')

pkgs/native_assets_cli/example/build/download_asset/README.md

@@ -9,6 +9,7 @@ Run tests with `dart --enable-experiment=native-assets test`.
 
 A typical layout of a package which downloads assets:
 
+* `tool/build.dart` prebuilts assets and is exercised from a GitHub workflow.
+* A [github workflow](../../../../../.github/workflows/native.yaml) that builds assets.
 * `hook/build.dart` downloads the prebuilt assets.
 * `lib/` contains Dart code which uses the assets.
-* `tool/build.dart` prebuilts assets and is exercised from the GitHub CI.

pkgs/native_assets_cli/example/build/download_asset/hook/build.dart

@@ -6,6 +6,7 @@ import 'dart:io';
 
 import 'package:download_asset/src/hook_helpers/c_build.dart';
 import 'package:download_asset/src/hook_helpers/download.dart';
+import 'package:download_asset/src/hook_helpers/hashes.dart';
 import 'package:native_assets_cli/code_assets_builder.dart';
 import 'package:native_assets_cli/native_assets_cli.dart';
 
@@ -30,6 +31,15 @@ void main(List<String> args) async {
         iOSSdk,
         outputDirectory,
       );
+      final fileHash = await hashAsset(file);
+      final expectedHash = assetHashes[createTargetName(
+        targetOS.name,
+        targetArchitecture.name,
+        iOSSdk?.type,
+      )];
+      if (fileHash != expectedHash) {
+        throw Exception('File $file was not downloaded correctly.');
+      }
       output.codeAssets.add(CodeAsset(
         package: config.packageName,
         name: 'native_add.dart',