Update handling of SelfContained and RuntimeIdentifier properties when specified on the command line

documentation/general/SelfContainedBreakingChangeNotification.md

@@ -0,0 +1,53 @@
+# [Breaking change]: Handling of command-line RuntimeIdentifier and SelfContained properties across project references
+
+## Description
+
+The `RuntimeIdentifier` and `SelfContained` properties can be specified on the command line to commands such as `dotnet build` and `dotnet publish`.
+They can be specified either via parameters such as `-r` or `--self-contained`, or via the generic `-p:Key=Value` parameter, such as `-p:SelfContained=true`.
+
+If these properties are specified on the command line, we've updated how they are applied (or not applied) to projects referenced by the initial project that is being built.
+
+## Version
+
+???
+
+## Previous behavior
+
+If `SelfContained` was specified on the command line, it would always flow to referenced projects.
+
+`RuntimeIdentifier` would flow to referenced projects where either the `RuntimeIdentifier` or `RuntimeIdentifiers` properties were non-empty.
+
+## New Behavior
+
+Both `SelfContained` and `RuntimeIdentifier` will flow to a referenced project if any of the following are true for the referenced project:
+
+- The `IsRidAgnostic` property is set to `false`
+- The `OutputType` is `Exe` or `WinExe`
+- Either the `RuntimeIdentifer` or `RuntimeIdentifiers` property is non-empty
+
+## Type of breaking change
+
+Source incompatible
+
+## Reason for change
+
+As of .NET SDK 6.0.100, we recommend specifying the value for self-contained on the command line if you specify the RuntimeIdentifier.
+(This is because in the future we are considering [changing the logic](https://github.com/dotnet/designs/blob/main/accepted/2021/architecture-targeting.md)
+so that specifying the RuntimeIdentifier on the command line doesn't automatically set the app to self-contained.)  We also added a warning message
+to guide you to do so.
+
+However, if you followed the warning and switched to a command specifying both the RuntimeIdentifier and the value for self-contained (for example
+`dotnet build -r win-x64 --self-contained`), the command could fail if you referenced an Exe project, because the `RuntimeIdentifier` you specified
+would not apply to the referenced project, but the `SelfContained` value would, and it's an error for an Exe project to have `SelfContained` set to
+true without having a `RuntimeIdentifier` set.
+
+## Recommended action
+
+If you were relying on the `SelfContained` property to apply to all projects when it was specified on the command line, then you can get similar behavior
+by setting `IsRidAgnostic` to false either in a file ([such as Directory.Build.props](https://docs.microsoft.com/visualstudio/msbuild/customize-your-build#directorybuildprops-and-directorybuildtargets)),
+or as a command-line parameter such as `-p:IsRidAgnostic=false`.
+
+## Open Questions
+
+TODO: How does this apply to solutions?  Could a solution build set IsRidAgnostic to false for all projects, and would that fix other issues we have when specifying the RuntimeIdentifier for a solution build?
+TODO: What happens if there's an Exe1 -> Library -> Exe2 reference, especially if there's also a direct reference from Exe1 -> Exe2

src/Tasks/Microsoft.NET.Build.Tasks/ValidateExecutableReferences.cs

@@ -52,6 +52,38 @@ protected override void ExecuteCore()
                 bool shouldBeValidatedAsExecutableReference = MSBuildUtilities.ConvertStringToBool(projectAdditionalProperties["ShouldBeValidatedAsExecutableReference"], true);
                 bool referencedProjectIsExecutable = MSBuildUtilities.ConvertStringToBool(projectAdditionalProperties["_IsExecutable"]);
                 bool referencedProjectIsSelfContained = MSBuildUtilities.ConvertStringToBool(projectAdditionalProperties["SelfContained"]);
+                bool referencedProjectHadSelfContainedSpecified = MSBuildUtilities.ConvertStringToBool(projectAdditionalProperties["_SelfContainedWasSpecified"]);
+
+                var globalProperties = BuildEngine6.GetGlobalProperties();
+
+                bool selfContainedIsGlobalProperty = globalProperties.ContainsKey("SelfContained");
+                bool runtimeIdentifierIsGlobalProperty = globalProperties.ContainsKey("RuntimeIdentifier");
+
+                bool projectIsRidAgnostic = true;
+                if (projectAdditionalProperties.TryGetValue("IsRidAgnostic", out string isRidAgnostic) &&
+                    bool.TryParse(isRidAgnostic, out bool isRidAgnosticParseResult))
+                {
+                    projectIsRidAgnostic = isRidAgnosticParseResult;
+                }
+
+                if (!projectIsRidAgnostic)
+                {
+                    //  If the project is NOT RID agnostic, and SelfContained was set as a global property,
+                    //  then SelfContained will flow across the project reference when we go to build it,
+                    //  despite the fact that we ignored it when doing the GetTargetFrameworks negotiation
+                    if (selfContainedIsGlobalProperty && SelfContained)
+                    {
+                        referencedProjectIsSelfContained = true;
+                    }
+
+                    //  If the project is NOT RID agnostic, then a global RuntimeIdentifier will flow to it.
+                    //  If the project didn't explicitly specify a value for SelfContained, then this will
+                    //  set SelfContained to true
+                    if (runtimeIdentifierIsGlobalProperty && !referencedProjectHadSelfContainedSpecified)
+                    {
+                        referencedProjectIsSelfContained = true;
+                    }
+                }
 
                 if (referencedProjectIsExecutable && shouldBeValidatedAsExecutableReference)
                 {

src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.BeforeCommon.targets

@@ -22,8 +22,9 @@ Copyright (c) .NET Foundation. All rights reserved.
 
   <PropertyGroup>
     <_IsExecutable Condition="'$(OutputType)' == 'Exe' or '$(OutputType)'=='WinExe'">true</_IsExecutable>
-  </PropertyGroup>
 
+  </PropertyGroup>
+
   <PropertyGroup Condition="'$(HasRuntimeOutput)' == ''">
     <HasRuntimeOutput>$(_IsExecutable)</HasRuntimeOutput>
     <_UsingDefaultForHasRuntimeOutput>true</_UsingDefaultForHasRuntimeOutput>

src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets

@@ -79,6 +79,15 @@ Copyright (c) .NET Foundation. All rights reserved.
     <PredefinedCulturesOnly Condition="'$(PredefinedCulturesOnly)' == '' and '$(InvariantGlobalization)' == 'true'">true</PredefinedCulturesOnly>
   </PropertyGroup>
 
+  <!-- Set the IsRidAgnostic property if this project should NOT accept global RuntimeIdentifier and SelfContained
+       property values from referencing projects. -->
+  <PropertyGroup Condition="'$(IsRidAgnostic)' == ''">
+    <IsRidAgnostic Condition="('$(_IsExecutable)' == 'true' And '$(IsTestProject)' != 'true') Or
+                              '$(RuntimeIdentifier)' != '' Or
+                              '$(RuntimeIdentifiers)' != ''">false</IsRidAgnostic>
+    <IsRidAgnostic Condition="'$(IsRidAgnostic)' == ''">true</IsRidAgnostic>
+  </PropertyGroup>
+
   <!-- Opt into .NET Core resource-serialization strategy by default when targeting frameworks
        that support it by default.
        -->
@@ -1069,9 +1078,11 @@ Copyright (c) .NET Foundation. All rights reserved.
   <ItemGroup>
     <AdditionalTargetFrameworkInfoProperty Include="SelfContained"/>
     <AdditionalTargetFrameworkInfoProperty Include="_IsExecutable"/>
+    <AdditionalTargetFrameworkInfoProperty Include="IsRidAgnostic"/>
     <AdditionalTargetFrameworkInfoProperty Include="ShouldBeValidatedAsExecutableReference"/>
+    <AdditionalTargetFrameworkInfoProperty Include="_SelfContainedWasSpecified"/>
   </ItemGroup>
-
+  
   <PropertyGroup Condition="'$(RuntimeIdentifier)' == 'browser-wasm'">
     <!-- Don't generate a NETSDK1151 error if a non self-contained Exe references a Blazor wasm Exe -->
     <ShouldBeValidatedAsExecutableReference>false</ShouldBeValidatedAsExecutableReference>

src/Tests/Microsoft.NET.Build.Tests/GivenThatWeWantToBuildALibrary.cs

@@ -488,8 +488,8 @@ public void It_can_use_implicitly_defined_compilation_constants(string targetFra
                 testProj.AdditionalProperties["TargetPlatformIdentifier"] = targetPlatformIdentifier;
                 testProj.AdditionalProperties["TargetPlatformVersion"] = targetPlatformVersion;
             }
-            var testAsset = _testAssetsManager.CreateTestProject(testProj, targetFramework);
-            File.WriteAllText(Path.Combine(testAsset.Path, testProj.Name, $"{testProj.Name}.cs"), @"
+
+            testProj.SourceFiles[$"{testProj.Name}.cs"] = @"
 using System;
 class Program
 {
@@ -529,7 +529,8 @@ static void Main(string[] args)
             Console.WriteLine(""IOS"");
         #endif
     }
-}");
+}";
+            var testAsset = _testAssetsManager.CreateTestProject(testProj, targetFramework);
 
             var buildCommand = new BuildCommand(Log, Path.Combine(testAsset.Path, testProj.Name));
             buildCommand

src/Tests/Microsoft.NET.Build.Tests/GivenThereAreDefaultItems.cs

@@ -392,6 +392,7 @@ public void It_does_not_include_items_in_any_group_if_group_specific_default_inc
                     XElement itemGroup = new XElement(ns + "ItemGroup");
                     project.Root.Add(itemGroup);
                     itemGroup.Add(new XElement(ns + "Compile", new XAttribute("Include", testProject.Name + ".cs")));
+                    itemGroup.Add(new XElement(ns + "Compile", new XAttribute("Include", testProject.Name + "Program.cs")));
                 });
 
             var projectFolder = Path.Combine(testAsset.TestRoot, testProject.Name);
@@ -409,7 +410,7 @@ public void It_does_not_include_items_in_any_group_if_group_specific_default_inc
 
             var compileItems = getCompileItemsCommand.GetValues();
             RemoveGeneratedCompileItems(compileItems);
-            compileItems.ShouldBeEquivalentTo(new[] { testProject.Name + ".cs" });
+            compileItems.ShouldBeEquivalentTo(new[] { testProject.Name + ".cs", testProject.Name + "Program.cs" });
 
             // Validate None items.
             var getNoneItemsCommand = new GetValuesCommand(Log, projectFolder, testProject.TargetFrameworks, "None", GetValuesCommand.ValueType.Item);