[dotnet-watch] Add device selection support

src/Dotnet.Watch/Watch.Aspire/Server/AspireWatcherLauncher.cs

@@ -40,7 +40,7 @@ protected async Task<int> LaunchWatcherAsync(
 
         try
         {
-            var watcher = new HotReloadDotNetWatcher(context, Console, processLauncherFactory, targetFrameworkSelectionPrompt: null);
+            var watcher = new HotReloadDotNetWatcher(context, Console, processLauncherFactory, selectionPrompt: null);
             await watcher.WatchAsync(cancellationSource.Token);
         }
         catch (OperationCanceledException) when (shutdownHandler.CancellationToken.IsCancellationRequested)

src/Dotnet.Watch/Watch/Build/BuildNames.cs

@@ -55,6 +55,7 @@ internal static class TargetNames
     public const string ResolveReferencedProjectsStaticWebAssets = nameof(ResolveReferencedProjectsStaticWebAssets);
     public const string GenerateComputedBuildStaticWebAssets = nameof(GenerateComputedBuildStaticWebAssets);
     public const string ReferenceCopyLocalPathsOutputGroup = nameof(ReferenceCopyLocalPathsOutputGroup);
+    public const string ComputeAvailableDevices = nameof(ComputeAvailableDevices);
 }
 
 internal static class ProjectCapability

src/Dotnet.Watch/Watch/Build/EvaluationResult.cs

@@ -14,12 +14,11 @@ internal sealed class EvaluationResult(
     LoadedProjectGraph projectGraph,
     IReadOnlyDictionary<ProjectInstanceId, ProjectInstance> restoredProjectInstances,
     IReadOnlyDictionary<string, FileItem> files,
-    IReadOnlyDictionary<ProjectInstanceId, StaticWebAssetsManifest> staticWebAssetsManifests,
-    ProjectBuildManager buildManager)
+    IReadOnlyDictionary<ProjectInstanceId, StaticWebAssetsManifest> staticWebAssetsManifests)
 {
     public IReadOnlyDictionary<string, FileItem> Files => files;
     public LoadedProjectGraph ProjectGraph => projectGraph;
-    public ProjectBuildManager BuildManager => buildManager;
+    public ProjectBuildManager BuildManager => projectGraph.BuildManager;
 
     public readonly FilePathExclusions ItemExclusions
         = projectGraph != null ? FilePathExclusions.Create(projectGraph.Graph) : FilePathExclusions.Empty;
@@ -70,14 +69,11 @@ public static ImmutableDictionary<string, string> GetGlobalBuildProperties(IEnum
         var projectLoadingStopwatch = Stopwatch.StartNew();
         var stopwatch = Stopwatch.StartNew();
 
-        var buildReporter = new BuildReporter(projectGraph.Logger, globalOptions, environmentOptions);
-        var buildManager = new ProjectBuildManager(projectGraph.ProjectCollection, buildReporter);
-
         if (restore)
         {
             var restoreRequests = projectGraph.Graph.GraphRoots.Select(node => BuildRequest.Create(node.ProjectInstance, [TargetNames.Restore])).ToArray();
 
-            if (await buildManager.BuildAsync(
+            if (await projectGraph.BuildManager.BuildAsync(
                 restoreRequests,
                 onFailure: failedInstance =>
                 {
@@ -108,7 +104,7 @@ public static ImmutableDictionary<string, string> GetGlobalBuildProperties(IEnum
 
         var buildRequests = CreateDesignTimeBuildRequests(projectGraph.Graph, mainProjectTargetFramework, environmentOptions.SuppressHandlingStaticWebAssets).ToImmutableArray();
 
-        var buildResults = await buildManager.BuildAsync(
+        var buildResults = await projectGraph.BuildManager.BuildAsync(
             buildRequests,
             onFailure: failedInstance =>
             {
@@ -132,7 +128,7 @@ public static ImmutableDictionary<string, string> GetGlobalBuildProperties(IEnum
 
         BuildReporter.ReportWatchedFiles(logger, fileItems);
 
-        return new EvaluationResult(projectGraph, restoredProjectInstances, fileItems, staticWebAssetManifests, buildManager);
+        return new EvaluationResult(projectGraph, restoredProjectInstances, fileItems, staticWebAssetManifests);
     }
 
     // internal for testing

src/Dotnet.Watch/Watch/Build/LoadedProjectGraph.cs

@@ -7,7 +7,7 @@
 
 namespace Microsoft.DotNet.Watch;
 
-internal sealed class LoadedProjectGraph(ProjectGraph graph, ProjectCollection collection, ILogger logger)
+internal sealed class LoadedProjectGraph(ProjectGraph graph, ProjectCollection collection, ILogger logger, GlobalOptions globalOptions, EnvironmentOptions environmentOptions)
 {
     // full path of proj file to list of nodes representing all target frameworks of the project (excluding outer build nodes):
     private readonly IReadOnlyDictionary<string, IReadOnlyList<ProjectGraphNode>> _innerBuildNodes = 
@@ -20,6 +20,9 @@ internal sealed class LoadedProjectGraph(ProjectGraph graph, ProjectCollection c
             .Concat(graph.ProjectNodes.Select(p => p.ProjectInstance.FullPath))
             .ToHashSet(PathUtilities.OSSpecificPathComparer));
 
+    public readonly ProjectBuildManager BuildManager =
+        new(collection, new BuildReporter(logger, globalOptions, environmentOptions));
+
     public ProjectGraph Graph => graph;
     public ILogger Logger => logger;
     public ProjectCollection ProjectCollection => collection;

src/Dotnet.Watch/Watch/Build/ProjectGraphFactory.cs

@@ -18,7 +18,9 @@ internal sealed class ProjectGraphFactory(
     ImmutableArray<ProjectRepresentation> rootProjects,
     string? virtualProjectTargetFramework,
     ImmutableDictionary<string, string> buildProperties,
-    ILogger logger)
+    ILogger logger,
+    GlobalOptions globalOptions,
+    EnvironmentOptions environmentOptions)
 {
     /// <summary>
     /// Reuse <see cref="ProjectCollection"/> with XML element caching to improve performance.
@@ -60,7 +62,9 @@ private static string GetProductTargetFramework()
             var graph = new LoadedProjectGraph(
                 new ProjectGraph(entryPoints, _collection, (path, globalProperties, collection) => CreateProjectInstance(path, globalProperties, collection, logger), cancellationToken),
                 _collection,
-                logger);
+                logger,
+                globalOptions,
+                environmentOptions);
 
             logger.LogDebug("Project graph loaded in {Time}s.", stopwatch.Elapsed.TotalSeconds.ToString("0.0"));
             return graph;

src/Dotnet.Watch/Watch/Context/ProjectOptions.cs

@@ -22,6 +22,18 @@ internal sealed record ProjectOptions
     /// </summary>
     public string? TargetFramework { get; init; }
 
+    /// <summary>
+    /// Device identifier to use when launching the project.
+    /// If the project supports device selection and <see cref="Device"/> is null
+    /// the user will be prompted for a device in interactive mode.
+    /// </summary>
+    public string? Device { get; init; }
+
+    /// <summary>
+    /// RuntimeIdentifier provided by the selected device, if any.
+    /// </summary>
+    public string? DeviceRuntimeIdentifier { get; init; }
+
     /// <summary>
     /// No value indicates that no launch profile should be used.
     /// Null value indicates that the default launch profile should be used.