Use out-of-proc MSBuild evaluation (#674)

* Use out-of-proc MSBuild evaluation

This allows for support for new SDKs/TFMs without needing tye to target those TFMs

* Combine restore and metadata evaluation

* Batch process projects

clean.cmd

@@ -0,0 +1,3 @@
+@ECHO OFF
+SETLOCAL
+PowerShell -NoProfile -NoLogo -ExecutionPolicy ByPass -Command "[System.Threading.Thread]::CurrentThread.CurrentCulture = ''; [System.Threading.Thread]::CurrentThread.CurrentUICulture = ''; try { & '%~dp0clean.ps1' %*; exit $LASTEXITCODE } catch { write-host $_; exit 1 }"

clean.ps1

@@ -0,0 +1,42 @@
+#requires -version 5
+
+<#
+.SYNOPSIS
+Clean this repository.
+
+.DESCRIPTION
+This script cleans this repository interactively, leaving downloaded infrastructure untouched.
+Clean operation is interactive to avoid losing new but unstaged files. Press 'c' then [Enter]
+to perform the proposed deletions.
+
+.EXAMPLE
+Perform default clean operation.
+
+    clean.ps1
+
+.EXAMPLE
+Clean everything but downloaded infrastructure and VS / VS Code folders.
+
+    clean.ps1 -e .vs/ -e .vscode/
+#>
+
+[CmdletBinding(PositionalBinding = $false)]
+param(
+    # Other lifecycle targets
+    [switch]$Help, # Show help
+
+    # Capture the rest
+    [Parameter(ValueFromRemainingArguments = $true)]
+    [string[]]$GitArguments
+)
+
+Set-StrictMode -Version 2
+$ErrorActionPreference = 'Stop'
+
+if ($Help) {
+    Get-Help $PSCommandPath
+    exit 0
+}
+
+git clean -dix -e .dotnet/ -e .tools/ @GitArguments
+git checkout -- $(git ls-files -d)

clean.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+#
+# Functions
+#
+__usage() {
+    echo "Usage: $(basename "${BASH_SOURCE[0]}") <Arguments>
+
+Arguments:
+    <Arguments>...         Arguments passed to the 'git' command. Any number of arguments allowed.
+
+Description:
+    This script cleans the repository interactively, leaving downloaded infrastructure untouched.
+    Clean operation is interactive to avoid losing new but unstaged files. Press 'c' then [Enter]
+    to perform the proposed deletions.
+"
+}
+
+git_args=()
+
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        -\?|-h|--help)
+            __usage
+            exit 0
+            ;;
+        *)
+            git_args[${#git_args[*]}]="$1"
+            ;;
+    esac
+    shift
+done
+
+# This incantation avoids unbound variable issues if git_args is empty
+# https://stackoverflow.com/questions/7577052/bash-empty-array-expansion-with-set-u
+git clean -dix -e .dotnet/ -e .tools/ ${git_args[@]+"${git_args[@]}"}

src/Microsoft.Tye.Core/ApplicationFactory.cs

@@ -4,9 +4,12 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.IO;
 using System.Linq;
+using System.Reflection;
 using System.Runtime.InteropServices;
+using System.Text;
 using System.Threading.Tasks;
 using Microsoft.Tye.ConfigModel;
 
@@ -74,6 +77,88 @@ namespace Microsoft.Tye
                     config.Services.Where(filter.ServicesFilter).ToList() :
                     config.Services;
 
+                var sw = Stopwatch.StartNew();
+                // Project services will be restored and evaluated before resolving all other services.
+                // This batching will mitigate the performance cost of running MSBuild out of process.
+                var projectServices = services.Where(s => !string.IsNullOrEmpty(s.Project));
+                var projectMetadata = new Dictionary<string, string>();
+
+                using (var directory = TempDirectory.Create())
+                {
+                    var projectPath = Path.Combine(directory.DirectoryPath, Path.GetRandomFileName() + ".proj");
+
+                    var sb = new StringBuilder();
+                    sb.AppendLine("<Project>");
+                    sb.AppendLine("    <ItemGroup>");
+
+                    foreach (var project in projectServices)
+                    {
+                        var expandedProject = Environment.ExpandEnvironmentVariables(project.Project!);
+                        project.ProjectFullPath = Path.Combine(config.Source.DirectoryName!, expandedProject);
+
+                        if (!File.Exists(project.ProjectFullPath))
+                        {
+                            throw new CommandException($"Failed to locate project: '{project.ProjectFullPath}'.");
+                        }
+
+                        sb.AppendLine($"        <MicrosoftTye_ProjectServices " +
+                            $"Include=\"{project.ProjectFullPath}\" " +
+                            $"Name=\"{project.Name}\" " +
+                            $"BuildProperties=\"{(project.BuildProperties.Any() ? project.BuildProperties.Select(kvp => $"{kvp.Name}={kvp.Value}").Aggregate((a, b) => a + ";" + b) : string.Empty)}\" />");
+                    }
+                    sb.AppendLine(@"    </ItemGroup>");
+
+                    sb.AppendLine($@"    <Target Name=""MicrosoftTye_EvaluateProjects"">");
+                    sb.AppendLine($@"        <MsBuild Projects=""@(MicrosoftTye_ProjectServices)"" "
+                        + $@"Properties=""%(BuildProperties);"
+                        + $@"MicrosoftTye_ProjectName=%(Name)"" "
+                        + $@"Targets=""MicrosoftTye_GetProjectMetadata"" BuildInParallel=""true"" />");
+
+                    sb.AppendLine("    </Target>");
+                    sb.AppendLine("</Project>");
+                    File.WriteAllText(projectPath, sb.ToString());
+
+                    output.WriteDebugLine("Restoring and evaluating projects");
+
+                    var msbuildEvaluationResult = await ProcessUtil.RunAsync(
+                        "dotnet",
+                        $"build " +
+                            $"\"{projectPath}\" " +
+                            $"/p:CustomAfterMicrosoftCommonTargets={Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location)!, "ProjectEvaluation.targets")} " +
+                            $"/nologo",
+                        throwOnError: false,
+                        workingDirectory: directory.DirectoryPath);
+
+                    // If the build fails, we're not really blocked from doing our work.
+                    // For now we just log the output to debug. There are errors that occur during
+                    // running these targets we don't really care as long as we get the data.
+                    if (msbuildEvaluationResult.ExitCode != 0)
+                    {
+                        output.WriteDebugLine($"Evaluating project failed with exit code {msbuildEvaluationResult.ExitCode}:" +
+                            $"{Environment.NewLine}Ouptut: {msbuildEvaluationResult.StandardOutput}" +
+                            $"{Environment.NewLine}Error: {msbuildEvaluationResult.StandardError}");
+                    }
+
+                    var msbuildEvaluationOutput = msbuildEvaluationResult
+                        .StandardOutput
+                        .Split(Environment.NewLine);
+
+                    foreach (var line in msbuildEvaluationOutput)
+                    {
+                        if (line.Trim().StartsWith("Microsoft.Tye metadata: "))
+                        {
+                            var values = line.Split(':', 3);
+                            var projectName = values[1].Trim();
+                            var metadataPath = values[2].Trim();
+                            projectMetadata.Add(projectName, metadataPath);
+
+                            output.WriteDebugLine($"Resolved metadata for service {projectName} at {metadataPath}");
+                        }
+                    }
+
+                    output.WriteDebugLine($"Restore and project evaluation took: {sw.Elapsed.TotalMilliseconds}ms");
+                }
+
                 foreach (var configService in services)
                 {
                     ServiceBuilder service;
@@ -87,9 +172,7 @@ namespace Microsoft.Tye
 
                     if (!string.IsNullOrEmpty(configService.Project))
                     {
-                        var expandedProject = Environment.ExpandEnvironmentVariables(configService.Project);
+                        var project = new DotnetProjectServiceBuilder(configService.Name!, new FileInfo(configService.ProjectFullPath));
-                        var projectFile = new FileInfo(Path.Combine(config.Source.DirectoryName!, expandedProject));
-                        var project = new DotnetProjectServiceBuilder(configService.Name!, projectFile);
                         service = project;
 
                         project.Build = configService.Build ?? true;
@@ -107,7 +190,13 @@ namespace Microsoft.Tye
                         // to prompt for the registry name.
                         project.ContainerInfo = new ContainerInfo() { UseMultiphaseDockerfile = false, };
 
-                        await ProjectReader.ReadProjectDetailsAsync(output, project);
+                        // If project evaluation is successful this should not happen, therefore an exception will be thrown.
+                        if (!projectMetadata.ContainsKey(configService.Name))
+                        {
+                            throw new CommandException($"Evaluated project metadata file could not be found for service {configService.Name}");
+                        }
+
+                        ProjectReader.ReadProjectDetails(output, project, projectMetadata[configService.Name]);
 
                         // Do k8s by default.
                         project.ManifestInfo = new KubernetesManifestInfo();

src/Microsoft.Tye.Core/ConfigModel/ConfigService.cs

@@ -25,6 +25,7 @@ namespace Microsoft.Tye.ConfigModel
         public Dictionary<string, string> DockerFileArgs { get; set; } = new Dictionary<string, string>();
         public string? DockerFileContext { get; set; }
         public string? Project { get; set; }
+        public string? ProjectFullPath { get; set; }
         public string? Include { get; set; }
         public string? Repository { get; set; }
         public bool? Build { get; set; }

src/Microsoft.Tye.Core/Microsoft.Tye.Core.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
     <RootNamespace>Tye</RootNamespace>
     <AssemblyName>Microsoft.Tye.Core</AssemblyName>
     <PackageId>Microsoft.Tye.Core</PackageId>

src/Microsoft.Tye.Core/ProjectReader.cs

@@ -10,15 +10,9 @@ using System.Linq;
 using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
-using System.Runtime.Loader;
 using System.Threading.Tasks;
 using Microsoft.Build.Construction;
-using Microsoft.Build.Definition;
-using Microsoft.Build.Evaluation;
-using Microsoft.Build.Execution;
-using Microsoft.Build.Framework;
 using Microsoft.Build.Locator;
-using Microsoft.Build.Logging;
 using Semver;
 
 namespace Microsoft.Tye
@@ -61,7 +55,7 @@ namespace Microsoft.Tye
             }
         }
 
-        public static Task ReadProjectDetailsAsync(OutputContext output, DotnetProjectServiceBuilder project)
+        public static void ReadProjectDetails(OutputContext output, DotnetProjectServiceBuilder project, string metadataFile)
         {
             if (output is null)
             {
@@ -73,14 +67,12 @@ namespace Microsoft.Tye
                 throw new ArgumentNullException(nameof(project));
             }
 
-            if (!Directory.Exists(project.ProjectFile.DirectoryName))
+            if (project is null)
             {
-                throw new CommandException($"Failed to locate directory: '{project.ProjectFile.DirectoryName}'.");
+                throw new ArgumentNullException(nameof(metadataFile));
             }
 
-            EnsureMSBuildRegistered(output, project.ProjectFile);
+            EvaluateProject(output, project, metadataFile);
-
-            EvaluateProject(output, project);
 
             if (!SemVersion.TryParse(project.Version, out var version))
             {
@@ -88,8 +80,6 @@ namespace Microsoft.Tye
                 version = new SemVersion(0, 1, 0);
                 project.Version = version.ToString();
             }
-
-            return Task.CompletedTask;
         }
 
         private static void EnsureMSBuildRegistered(OutputContext? output, FileInfo projectFile)
@@ -138,118 +128,40 @@ namespace Microsoft.Tye
             }
         }
 
-        [MethodImpl(MethodImplOptions.NoInlining)]
-        private static void LogIt(OutputContext output)
-        {
-            output.WriteDebugLine("Loaded: " + typeof(ProjectInstance).Assembly.FullName);
-            output.WriteDebugLine("Loaded From: " + typeof(ProjectInstance).Assembly.Location);
-        }
-
         // Do not load MSBuild types before using EnsureMSBuildRegistered.
         [MethodImpl(MethodImplOptions.NoInlining)]
-        private static void EvaluateProject(OutputContext output, DotnetProjectServiceBuilder project)
+        private static void EvaluateProject(OutputContext output, DotnetProjectServiceBuilder project, string metadataFile)
         {
             var sw = Stopwatch.StartNew();
 
-            // Currently we only log at debug level.
+            var metadata = new Dictionary<string, string>();
-            var logger = new ConsoleLogger(
+            var metadataKVPs = File.ReadLines(metadataFile).Select(l => l.Split(new[] { ':' }, 2));
-                verbosity: LoggerVerbosity.Normal,
-                write: message => output.WriteDebug(message),
-                colorSet: null,
-                colorReset: null);
-
-            // We need to isolate projects from each other for testing. MSBuild does not support
-            // loading the same project twice in the same collection.
-            var projectCollection = new ProjectCollection();
-
-            ProjectInstance projectInstance;
-            Microsoft.Build.Evaluation.Project msbuildProject;
 
-            try
+            foreach (var metadataKVP in metadataKVPs)
             {
-                output.WriteDebugLine($"Loading project '{project.ProjectFile.FullName}'.");
+                if (!string.IsNullOrEmpty(metadataKVP[1]))
-                msbuildProject = Microsoft.Build.Evaluation.Project.FromFile(project.ProjectFile.FullName, new ProjectOptions()
-                {
-                    ProjectCollection = projectCollection,
-                    GlobalProperties = project.BuildProperties
-                });
-                projectInstance = msbuildProject.CreateProjectInstance();
-                output.WriteDebugLine($"Loaded project '{project.ProjectFile.FullName}'.");
-            }
-            catch (Exception ex)
-            {
-                throw new CommandException($"Failed to load project: '{project.ProjectFile.FullName}'.", ex);
-            }
-
-            try
-            {
-                AssemblyLoadContext.Default.Resolving += ResolveAssembly;
-
-                output.WriteDebugLine($"Restoring project '{project.ProjectFile.FullName}'.");
-
-                // Similar to what MSBuild does for restore:
-                // https://github.com/microsoft/msbuild/blob/3453beee039fb6f5ccc54ac783ebeced31fec472/src/MSBuild/XMake.cs#L1417
-                //
-                // We need to do restore as a separate operation
-                var restoreRequest = new BuildRequestData(
-                    projectInstance,
-                    targetsToBuild: new[] { "Restore" },
-                    hostServices: null,
-                    flags: BuildRequestDataFlags.ClearCachesAfterBuild | BuildRequestDataFlags.SkipNonexistentTargets | BuildRequestDataFlags.IgnoreMissingEmptyAndInvalidImports);
-
-                var parameters = new BuildParameters(projectCollection)
                 {
-                    Loggers = new[] { logger, },
+                    metadata.Add(metadataKVP[0], metadataKVP[1].Trim());
-                };
+                }
-
-                // We don't really look at the result, because it's not clear we should halt totally
-                // if restore fails.
-                var restoreResult = BuildManager.DefaultBuildManager.Build(parameters, restoreRequest);
-                output.WriteDebugLine($"Restored project '{project.ProjectFile.FullName}'.");
-
-                msbuildProject.MarkDirty();
-                projectInstance = msbuildProject.CreateProjectInstance();
-
-                var targets = new List<string>()
-                {
-                    "ResolveReferences",
-                    "ResolvePackageDependenciesDesignTime",
-                    "PrepareResources",
-                    "GetAssemblyAttributes",
-                };
-
-                var result = projectInstance.Build(
-                    targets: targets.ToArray(),
-                    loggers: new[] { logger, });
-
-                // If the build fails, we're not really blocked from doing our work.
-                // For now we just log the output to debug. There are errors that occur during
-                // running these targets we don't really care as long as we get the data.
-            }
-            finally
-            {
-                AssemblyLoadContext.Default.Resolving -= ResolveAssembly;
             }
 
             // Reading a few different version properties to be more resilient.
-            var version =
+            var version = GetMetadataValueOrNull("AssemblyInformationalVersion") ??
-                projectInstance.GetProperty("AssemblyInformationalVersion")?.EvaluatedValue ??
+                 GetMetadataValueOrNull("InformationalVersion") ??
-                projectInstance.GetProperty("InformationalVersion")?.EvaluatedValue ??
+                 GetMetadataValueOrEmpty("Version");
-                projectInstance.GetProperty("Version").EvaluatedValue;
             project.Version = version;
             output.WriteDebugLine($"Found application version: {version}");
 
-            var targetFrameworks = projectInstance.GetPropertyValue("TargetFrameworks");
+            project.TargetFrameworks = GetMetadataValueOrNull("TargetFrameworks")?.Split(';', StringSplitOptions.RemoveEmptyEntries) ?? Array.Empty<string>();
-            project.TargetFrameworks = targetFrameworks.Split(';', StringSplitOptions.RemoveEmptyEntries) ?? Array.Empty<string>();
 
             // Figure out if functions app.
             // If so, run app with function host.
-            project.RunCommand = projectInstance.GetPropertyValue("RunCommand");
+            project.RunCommand = GetMetadataValueOrEmpty("RunCommand");
-            project.RunArguments = projectInstance.GetPropertyValue("RunArguments");
+            project.RunArguments = GetMetadataValueOrEmpty("RunArguments");
-            project.TargetPath = projectInstance.GetPropertyValue("TargetPath");
+            project.TargetPath = GetMetadataValueOrEmpty("TargetPath");
-            project.PublishDir = projectInstance.GetPropertyValue("PublishDir");
+            project.PublishDir = GetMetadataValueOrEmpty("PublishDir");
-            project.AssemblyName = projectInstance.GetPropertyValue("AssemblyName");
+            project.AssemblyName = GetMetadataValueOrEmpty("AssemblyName");
-            project.IntermediateOutputPath = projectInstance.GetPropertyValue("IntermediateOutputPath");
+            project.IntermediateOutputPath = GetMetadataValueOrEmpty("IntermediateOutputPath");
 
             output.WriteDebugLine($"RunCommand={project.RunCommand}");
             output.WriteDebugLine($"RunArguments={project.RunArguments}");
@@ -263,63 +175,37 @@ namespace Microsoft.Tye
             project.TargetPath = Path.Combine(project.ProjectFile.DirectoryName!, NormalizePath(project.TargetPath));
             project.PublishDir = Path.Combine(project.ProjectFile.DirectoryName!, NormalizePath(project.PublishDir));
 
-            var targetFramework = projectInstance.GetPropertyValue("TargetFramework");
+            var targetFramework = GetMetadataValueOrEmpty("TargetFramework");
             project.TargetFramework = targetFramework;
             output.WriteDebugLine($"Found target framework: {targetFramework}");
 
             // TODO: Parse the name and version manually out of the TargetFramework field if it's non-null
-            project.TargetFrameworkName = projectInstance.GetPropertyValue("_ShortFrameworkIdentifier");
+            project.TargetFrameworkName = GetMetadataValueOrEmpty("_ShortFrameworkIdentifier");
-            project.TargetFrameworkVersion = projectInstance.GetPropertyValue("_ShortFrameworkVersion") ?? projectInstance.GetPropertyValue("_TargetFrameworkVersionWithoutV");
+            project.TargetFrameworkVersion = GetMetadataValueOrNull("_ShortFrameworkVersion") ?? GetMetadataValueOrEmpty("_TargetFrameworkVersionWithoutV");
 
-            var sharedFrameworks = projectInstance.GetItems("FrameworkReference").Select(i => i.EvaluatedInclude).ToList();
+            var sharedFrameworks = GetMetadataValueOrNull("FrameworkReference")?.Split(';') ?? Enumerable.Empty<string>();
             project.Frameworks.AddRange(sharedFrameworks.Select(s => new Framework(s)));
             output.WriteDebugLine($"Found shared frameworks: {string.Join(", ", sharedFrameworks)}");
 
             // determine container base image
             if (project.ContainerInfo != null)
             {
-                project.ContainerInfo.BaseImageName = projectInstance.GetPropertyValue("ContainerBaseImage");
+                project.ContainerInfo.BaseImageName = GetMetadataValueOrEmpty("ContainerBaseImage");
-                project.ContainerInfo.BaseImageTag = projectInstance.GetPropertyValue("ContainerBaseTag");
+                project.ContainerInfo.BaseImageTag = GetMetadataValueOrEmpty("ContainerBaseTag");
-            }
-
-            bool PropertyIsTrue(string property)
-            {
-                return projectInstance.GetPropertyValue(property) is string s && !string.IsNullOrEmpty(s) && bool.Parse(s);
             }
 
             project.IsAspNet = project.Frameworks.Any(f => f.Name == "Microsoft.AspNetCore.App") ||
-                               projectInstance.GetPropertyValue("MicrosoftNETPlatformLibrary") == "Microsoft.AspNetCore.App" ||
+                               GetMetadataValueOrEmpty("MicrosoftNETPlatformLibrary") == "Microsoft.AspNetCore.App" ||
-                               PropertyIsTrue("_AspNetCoreAppSharedFxIsEnabled") ||
+                               MetadataIsTrue("_AspNetCoreAppSharedFxIsEnabled") ||
-                               PropertyIsTrue("UsingMicrosoftNETSdkWeb");
+                               MetadataIsTrue("UsingMicrosoftNETSdkWeb");
 
             output.WriteDebugLine($"IsAspNet={project.IsAspNet}");
 
             output.WriteDebugLine($"Evaluation Took: {sw.Elapsed.TotalMilliseconds}ms");
 
-            // The Microsoft.Build.Locator doesn't handle the loading of other assemblies
+            string? GetMetadataValueOrNull(string key) => metadata!.TryGetValue(key, out var value) ? value : null;
-            // that are shipped with MSBuild (ex NuGet).
+            string GetMetadataValueOrEmpty(string key) => metadata!.TryGetValue(key, out var value) ? value : string.Empty;
-            //
+            bool MetadataIsTrue(string key) => metadata!.TryGetValue(key, out var value) && bool.Parse(value);
-            // This means that the set of assemblies that need special handling depends on the targets
-            // that we run :(
-            //
-            // This is workaround for this limitation based on the targets we need to run
-            // to resolve references and versions.
-            //
-            // See: https://github.com/microsoft/MSBuildLocator/issues/86
-            Assembly? ResolveAssembly(AssemblyLoadContext context, AssemblyName assemblyName)
-            {
-                if (assemblyName.Name is object)
-                {
-                    var msbuildDirectory = Environment.GetEnvironmentVariable("MSBuildExtensionsPath")!;
-                    var assemblyFilePath = Path.Combine(msbuildDirectory, assemblyName.Name + ".dll");
-                    if (File.Exists(assemblyFilePath))
-                    {
-                        return context.LoadFromAssemblyPath(assemblyFilePath);
-                    }
-                }
-
-                return default;
-            }
         }
 
         private static string NormalizePath(string path)

src/Microsoft.Tye.Extensions/Microsoft.Tye.Extensions.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>

src/Microsoft.Tye.Hosting.Diagnostics/Microsoft.Tye.Hosting.Diagnostics.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
     <Description>Diagnostics collector and exporter for .NET Core applications.</Description>
     <AssemblyName>Microsoft.Tye.Hosting.Diagnostics</AssemblyName>
     <PackageId>Microsoft.Tye.Hosting.Diagnostics</PackageId>

src/Microsoft.Tye.Hosting/Microsoft.Tye.Hosting.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Library</OutputType>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
     <Description>Orchestration host APIs.</Description>
     <AssemblyName>Microsoft.Tye.Hosting</AssemblyName>
     <PackageId>Microsoft.Tye.Hosting</PackageId>
@@ -17,7 +17,7 @@
   <ItemGroup>
     <None Include="Watch\assets\**\*" CopyToOutputDirectory="PreserveNewest" CopyToPublishDirectory="PreserveNewest" />
   </ItemGroup>
-  
+
   <ItemGroup>
     <PackageReference Include="Bedrock.Framework" Version="0.1.38-alpha.gd25d5b37ad" />
     <PackageReference Include="FeatherHttp" Version="0.1.42-alpha.gf06a8747e7" />

src/tye-diag-agent/tye-diag-agent.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Worker">
 
   <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
     <RootNamespace>Microsoft.Tye</RootNamespace>
   </PropertyGroup>
 

src/tye/ProjectEvaluation.targets

@@ -0,0 +1,40 @@
+<Project>
+    <Target Name="MicrosoftTye_GetProjectMetadata" DependsOnTargets="Restore;ResolveReferences;ResolvePackageDependenciesDesignTime;PrepareResources;GetAssemblyAttributes" >
+        <PropertyGroup>
+            <_MicrosoftTye_MetadataFile>$([System.IO.Path]::GetFullPath('$(IntermediateOutputPath)MicrosoftTye.ProjectMetadata.txt'))</_MicrosoftTye_MetadataFile>
+            <_MicrosoftTye_ProjectFrameworkReference>@(FrameworkReference, '%3B')</_MicrosoftTye_ProjectFrameworkReference>
+        </PropertyGroup>
+
+        <ItemGroup>
+            <_MicrosoftTye_ProjectMetadata Include="AssemblyInformationalVersion: $(AssemblyInformationalVersion)" />
+            <_MicrosoftTye_ProjectMetadata Include="InformationalVersion: $(InformationalVersion)" />
+            <_MicrosoftTye_ProjectMetadata Include="Version: $(Version)" />
+            <_MicrosoftTye_ProjectMetadata Include="TargetFrameworks: $(TargetFrameworks)" />
+            <_MicrosoftTye_ProjectMetadata Include="RunCommand: $(RunCommand)" />
+            <_MicrosoftTye_ProjectMetadata Include="RunArguments: $(RunArguments)" />
+            <_MicrosoftTye_ProjectMetadata Include="TargetPath: $(TargetPath)" />
+            <_MicrosoftTye_ProjectMetadata Include="PublishDir: $(PublishDir)" />
+            <_MicrosoftTye_ProjectMetadata Include="AssemblyName: $(AssemblyName)" />
+            <_MicrosoftTye_ProjectMetadata Include="IntermediateOutputPath: $(IntermediateOutputPath)" />
+            <_MicrosoftTye_ProjectMetadata Include="TargetFramework: $(TargetFramework)" />
+            <_MicrosoftTye_ProjectMetadata Include="_ShortFrameworkIdentifier: $(_ShortFrameworkIdentifier)" />
+            <_MicrosoftTye_ProjectMetadata Include="_ShortFrameworkVersion: $(_ShortFrameworkVersion)" />
+            <_MicrosoftTye_ProjectMetadata Include="_TargetFrameworkVersionWithoutV: $(_TargetFrameworkVersionWithoutV)" />
+            <_MicrosoftTye_ProjectMetadata Include="FrameworkReference: $(_MicrosoftTye_ProjectFrameworkReference)" />
+            <_MicrosoftTye_ProjectMetadata Include="ContainerBaseImage: $(ContainerBaseImage)" />
+            <_MicrosoftTye_ProjectMetadata Include="ContainerBaseTag: $(ContainerBaseTag)" />
+            <_MicrosoftTye_ProjectMetadata Include="MicrosoftNETPlatformLibrary: $(MicrosoftNETPlatformLibrary)" />
+            <_MicrosoftTye_ProjectMetadata Include="_AspNetCoreAppSharedFxIsEnabled: $(_AspNetCoreAppSharedFxIsEnabled)" />
+            <_MicrosoftTye_ProjectMetadata Include="UsingMicrosoftNETSdkWeb: $(UsingMicrosoftNETSdkWeb)" />
+        </ItemGroup>
+
+        <WriteLinesToFile
+            File="$(_MicrosoftTye_MetadataFile)"
+            Lines="@(_MicrosoftTye_ProjectMetadata)"
+            Overwrite="true"
+            WriteOnlyWhenDifferent="true"/>
+
+        <Message Text="Microsoft.Tye metadata: $(MicrosoftTye_ProjectName): $(_MicrosoftTye_MetadataFile)" Importance="High"/>
+
+    </Target>
+</Project>

src/tye/tye.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
     <RootNamespace>Microsoft.Tye</RootNamespace>
     <AssemblyName>tye</AssemblyName>
     <PackageId>Microsoft.Tye</PackageId>
@@ -10,6 +10,10 @@
     <PackAsTool>true</PackAsTool>
   </PropertyGroup>
 
+  <ItemGroup>
+    <None Include="ProjectEvaluation.targets" CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
+
   <ItemGroup>
     <Compile Include="..\shared\KubectlDetector.cs" Link="KubectlDetector.cs" />
     <Compile Include="..\shared\TempFile.cs" Link="TempFile.cs" />

test/E2ETest/ApplicationFactoryTests.cs

@@ -118,8 +118,8 @@ services:
             var exception = await Assert.ThrowsAsync<CommandException>(async () =>
                 await ApplicationFactory.CreateAsync(outputContext, projectFile));
 
-            var wrongProjectPath = Path.Combine(projectDirectory.DirectoryPath, "backend1");
+            var wrongProjectPath = Path.Combine(projectDirectory.DirectoryPath, "backend1/backend.csproj");
-            Assert.Equal($"Failed to locate directory: '{wrongProjectPath}'.", exception.Message);
+            Assert.Equal($"Failed to locate project: '{wrongProjectPath}'.", exception.Message);
         }
     }
 }

test/E2ETest/Microsoft.Tye.E2ETests.csproj

@@ -2,7 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
     <AssemblyName>Microsoft.Tye.E2ETest</AssemblyName>
     <IsTestProject>true</IsTestProject>
     <IsUnitTestProject>true</IsUnitTestProject>

test/Microsoft.Tye.Extensions.Configuration.Tests/Microsoft.Tye.Extensions.Configuration.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
     <IsTestProject>true</IsTestProject>
   </PropertyGroup>
 

test/Test.Infrastructure/Test.Infrastructure.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
     <IsPackable>false</IsPackable>
     <TestRunnerName>XUnit</TestRunnerName>
     <Nullable>disable</Nullable>

test/UnitTests/Microsoft.Tye.UnitTests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
     <AssemblyName>Microsoft.Tye.UnitTests</AssemblyName>
     <IsTestProject>true</IsTestProject>
     <IsUnitTestProject>true</IsUnitTestProject>