[release/3.1] Auto-downgrade assemblies extensions' ref/ projects compile against

[dougbu]

The code at

aspnetcore/eng/SharedFramework.External.props

Lines 9 to 19 in 96e1537

	<!-- For the targeting pack, always use packages with PatchVersion=0 -->
	<PropertyGroup Condition="'$(MSBuildProjectName)' == 'Microsoft.AspNetCore.App.Ref' OR '$(IsReferenceAssemblyProject)' == 'true' ">
	<SystemIOPipelinesPackageVersion>$(SystemIOPipelinesPackageVersion.Split('.')[0]).$(SystemIOPipelinesPackageVersion.Split('.')[1]).0</SystemIOPipelinesPackageVersion>
	<SystemSecurityCryptographyXmlPackageVersion>$(SystemSecurityCryptographyXmlPackageVersion.Split('.')[0]).$(SystemSecurityCryptographyXmlPackageVersion.Split('.')[1]).0</SystemSecurityCryptographyXmlPackageVersion>
	<MicrosoftWin32SystemEventsPackageVersion>$(MicrosoftWin32SystemEventsPackageVersion.Split('.')[0]).$(MicrosoftWin32SystemEventsPackageVersion.Split('.')[1]).0</MicrosoftWin32SystemEventsPackageVersion>
	<SystemDiagnosticsEventLogPackageVersion>$(SystemDiagnosticsEventLogPackageVersion.Split('.')[0]).$(SystemDiagnosticsEventLogPackageVersion.Split('.')[1]).0</SystemDiagnosticsEventLogPackageVersion>
	<SystemDrawingCommonPackageVersion>$(SystemDrawingCommonPackageVersion.Split('.')[0]).$(SystemDrawingCommonPackageVersion.Split('.')[1]).0</SystemDrawingCommonPackageVersion>
	<SystemSecurityCryptographyPkcsPackageVersion>$(SystemSecurityCryptographyPkcsPackageVersion.Split('.')[0]).$(SystemSecurityCryptographyPkcsPackageVersion.Split('.')[1]).0</SystemSecurityCryptographyPkcsPackageVersion>
	<SystemSecurityPermissionsPackageVersion>$(SystemSecurityPermissionsPackageVersion.Split('.')[0]).$(SystemSecurityPermissionsPackageVersion.Split('.')[1]).0</SystemSecurityPermissionsPackageVersion>
	<SystemWindowsExtensionsPackageVersion>$(SystemWindowsExtensionsPackageVersion.Split('.')[0]).$(SystemWindowsExtensionsPackageVersion.Split('.')[1]).0</SystemWindowsExtensionsPackageVersion>
	</PropertyGroup>

urgently needs to be duplicated in the dotnet/extensions repo because we're rebuilding the extensions ref/ projects and Microsoft.AspNetCore.App.Ref in 3.1.8. The extensions ref/ projects have not built since 3.1.0.

This relates to dotnet/extensions#2787 and #24937 But, it's more urgent. In particular, System.IO.Pipelines has been serviced since 3.1.0 and we missed updating to the version we shipped in 3.1.4.

---

Side note: The following four packages contribute assemblies to Microsoft.AspNetCore.App.Ref but not Microsoft.AspNetCore.App.Runtime. If any of them are serviced, we'll need to add them to the *.0 auto-downgrade set in both dotnet/extensions and dotnet/aspnetcore.

• Microsoft.Win32.Registry
• System.Security.AccessControl # not mentioned in extensions
• System.Security.Cryptography.Cng
• System.Security.Principal.Windows # not mentioned in extensions

Should we be proactive here❔

[dougbu]

/cc @dotnet/aspnet-build

[dougbu]

As mentioned in #24937, we're leaning toward not being proactive about the "side note" in the description above. If we miss something, the worst case will be a reduction in the fidelity of our testing.

[dougbu]

dotnet/extensions@63c6df0 closes this out. Only remaining bits are

1. Dependency flow from extensions to aspnetcore
2. Perhaps more strict coherency dependencies in extensions to cover the rest of the list at

   aspnetcore/eng/SharedFramework.External.props

   Lines 9 to 19 in 96e1537

   	<!-- For the targeting pack, always use packages with PatchVersion=0 -->
   	<PropertyGroup Condition="'$(MSBuildProjectName)' == 'Microsoft.AspNetCore.App.Ref' OR '$(IsReferenceAssemblyProject)' == 'true' ">
   	<SystemIOPipelinesPackageVersion>$(SystemIOPipelinesPackageVersion.Split('.')[0]).$(SystemIOPipelinesPackageVersion.Split('.')[1]).0</SystemIOPipelinesPackageVersion>
   	<SystemSecurityCryptographyXmlPackageVersion>$(SystemSecurityCryptographyXmlPackageVersion.Split('.')[0]).$(SystemSecurityCryptographyXmlPackageVersion.Split('.')[1]).0</SystemSecurityCryptographyXmlPackageVersion>
   	<MicrosoftWin32SystemEventsPackageVersion>$(MicrosoftWin32SystemEventsPackageVersion.Split('.')[0]).$(MicrosoftWin32SystemEventsPackageVersion.Split('.')[1]).0</MicrosoftWin32SystemEventsPackageVersion>
   	<SystemDiagnosticsEventLogPackageVersion>$(SystemDiagnosticsEventLogPackageVersion.Split('.')[0]).$(SystemDiagnosticsEventLogPackageVersion.Split('.')[1]).0</SystemDiagnosticsEventLogPackageVersion>
   	<SystemDrawingCommonPackageVersion>$(SystemDrawingCommonPackageVersion.Split('.')[0]).$(SystemDrawingCommonPackageVersion.Split('.')[1]).0</SystemDrawingCommonPackageVersion>
   	<SystemSecurityCryptographyPkcsPackageVersion>$(SystemSecurityCryptographyPkcsPackageVersion.Split('.')[0]).$(SystemSecurityCryptographyPkcsPackageVersion.Split('.')[1]).0</SystemSecurityCryptographyPkcsPackageVersion>
   	<SystemSecurityPermissionsPackageVersion>$(SystemSecurityPermissionsPackageVersion.Split('.')[0]).$(SystemSecurityPermissionsPackageVersion.Split('.')[1]).0</SystemSecurityPermissionsPackageVersion>
   	<SystemWindowsExtensionsPackageVersion>$(SystemWindowsExtensionsPackageVersion.Split('.')[0]).$(SystemWindowsExtensionsPackageVersion.Split('.')[1]).0</SystemWindowsExtensionsPackageVersion>
   	</PropertyGroup>

3. Perhaps additions to the list at https://github.com/dotnet/extensions/blob/63c6df0aadb5096b220bec733428d6a59725efe5/eng/Versions.props#L88-L93

• i.e. may need to match the list above (currently extensions lists a subset)