[release/10.0.1xx] Support shared .NET installation

eng/pipelines/templates/jobs/sdk-diff-tests.yml

@@ -130,11 +130,12 @@ jobs:
       echo "##vso[task.setvariable variable=MsftSdkTarballPath]$(Pipeline.Workspace)/Artifacts/$msft_sdk_tarball_name"
       echo "##vso[task.setvariable variable=SdkTarballPath]$(Pipeline.Workspace)/Artifacts/$sdk_tarball_name"
       echo "##vso[task.setvariable variable=SourceBuiltArtifactsPath]$(Pipeline.Workspace)/Artifacts/$artifacts_path"
+      echo "##vso[task.setvariable variable=DotNetPath]$_InitializeDotNetCli"
     displayName: Prepare Tests
     workingDirectory: $(Build.SourcesDirectory)
 
   - script: >
-      .dotnet/dotnet test
+      $(DotNetPath)/dotnet test
       $(Build.SourcesDirectory)/test/Microsoft.DotNet.SourceBuild.Tests/Microsoft.DotNet.SourceBuild.Tests.csproj
       --filter "Category=SdkContent"
       --logger:'trx;LogFileName=$(Agent.JobName)_SDKDiffTests.trx'
@@ -182,6 +183,7 @@ jobs:
   - ${{ if and(eq(parameters.publishTestResultsPr, 'true'), or(eq(variables['Build.SourceBranch'], 'refs/heads/main'), startsWith(variables['Build.SourceBranch'], 'refs/heads/release'))) }}:
       - template: ../steps/create-baseline-update-pr.yml
         parameters:
+          dotnetPath: $(DotNetPath)
           pipeline: sdk
           repo: dotnet/dotnet
           originalFilesDirectory: test/Microsoft.DotNet.SourceBuild.Tests/assets/SdkContentTests

eng/pipelines/templates/stages/vmr-license-scan.yml

@@ -118,6 +118,7 @@ stages:
     - script: |
         source ./eng/common/tools.sh
         InitializeDotNetCli true
+        echo "##vso[task.setvariable variable=DotNetPath]$_InitializeDotNetCli"
       displayName: Install .NET SDK
       workingDirectory: $(Build.SourcesDirectory)
 
@@ -135,6 +136,7 @@ stages:
 
     - template: /eng/pipelines/templates/steps/create-baseline-update-pr.yml@self
       parameters:
+        dotnetPath: $(DotNetPath)
         pipeline: license
         repo: dotnet/dotnet
         originalFilesDirectory: test/Microsoft.DotNet.SourceBuild.Tests/assets/LicenseScanTests

eng/pipelines/templates/stages/vmr-scan.yml

@@ -16,11 +16,15 @@ stages:
     - script: |
         source ./eng/common/tools.sh
         InitializeDotNetCli true
-        .dotnet/dotnet tool restore
-      displayName: Initialize tooling
+        echo "##vso[task.setvariable variable=DotNetPath]$_InitializeDotNetCli"
+      displayName: Install .NET CLI
+
+    - script: |
+        $(DotNetPath)/dotnet tool restore
+      displayName: Restore tools
 
     - script: >
-        .dotnet/dotnet darc vmr scan-cloaked-files
+        $(DotNetPath)/dotnet darc vmr scan-cloaked-files
         --vmr "$(Build.SourcesDirectory)"
         --tmp "$(Agent.TempDirectory)"
         || (echo '##[error]Found cloaked files in the VMR' && exit 1)

eng/pipelines/templates/steps/create-baseline-update-pr.yml

@@ -1,4 +1,8 @@
 parameters:
+- name: dotnetPath
+  type: string
+  default: '$(Build.SourcesDirectory)/.dotnet'
+
 # The pipeline that is being run
 # Used to determine the correct baseline update tool to run
 # Currently only supports "sdk" and "license"
@@ -31,7 +35,7 @@ steps:
 
       branchName=$(echo "$(Build.SourceBranch)" | sed 's/refs\/heads\///g')
 
-      .dotnet/dotnet run \
+      $(DotNetPath)/dotnet run \
         --project eng/tools/CreateBaselineUpdatePR/ \
         --property:RestoreSources="$restoreSources" \
         "${{ parameters.pipeline }}" \