CodeAnalysisRuleSetDirectories not respected

[6bee]

Background

We're using a nuget package to distribute code analysis rule set (.ruleset) file as a default within our enterprise. In order to replace
or extend this default rule set, CodeAnalysisRuleSet property may be set on .csproj level to point to a custom .ruleset file.
One rule set file may include a number of other rule set files using Include element. However, included rule set files would not get resolved unless specified with their full path.

Issue

Specifying the directory of a .ruleset file via CodeAnalysisRuleSetDirectories property should allow setting the file name only in //RuleSet/Include/@path rather than full path. However, neither setting CodeAnalysisRuleSetDirectories in a nuget package props file nor in the csproj directly seems to work as expected, i.e. corresponding .ruleset files would not be resolved by VS/msbuild.

MyProject.csproj

<PropertyGroup>  
  <CodeAnalysisRuleSetDirectories>$(CodeAnalysisRuleSetDirectories);C:\nuget-package-location\rulesets\</CodeAnalysisRuleSetDirectories>
  <CodeAnalysisRuleSet>Style.ruleset</CodeAnalysisRuleSet>
</PropertyGroup>

Style.ruleset

<RuleSet Name="local project rules" Description=" " ToolsVersion="16.0">
  <Include Path="enterprise.ruleset" Action="Default" />
  ...
</RuleSet>

Expected Behavior

File C:\nuget-package-location\rulesets\enterprise.ruleset gets resolved by setting CodeAnalysisRuleSetDirectories property to C:\nuget-package-location\rulesets\ in MyProject.csproj and setting //RuleSet/Include/@path="enterprise.ruleset" in Style.ruleset.

Environment

Visual Studio Professional 2019 16.9.4
Windows 10 Pro 20H2

[rainersigwald]

I believe this is a feature request for Roslyn's implementation of rulesets; AFAIK code in the MSBuild repo only finds the entry-point ruleset.

[jinujoseph]

cc @mavasani