Switch CI job from Windows to Linux for faster/cheaper builds

Copilot · JanProvaznik · Copilot · commit d2e4f7e08253 · 2026-01-29T17:54:29.000Z
Co-authored-by: JanProvaznik &lt;25267098+JanProvaznik@users.noreply.github.com&gt;
diff --git a/.vsts-dotnet-ci.yml b/.vsts-dotnet-ci.yml
@@ -246,33 +246,32 @@ jobs:
     condition: eq(variables.onlyDocChanged, 0)
 
 - job: BootstrapMSBuildWithMTMode
-  displayName: "Windows Core Multithreaded Mode"
+  displayName: "Linux Core Multithreaded Mode"
   pool:
-    vmImage: 'windows-2022'
+    vmImage: 'ubuntu-latest'
   timeoutInMinutes: 120
   steps:
   - template: azure-pipelines/check-documentation-only-change.yml
   - ${{ if eq(variables['System.TeamProject'], 'DevDiv') }}:
-    - task: PowerShell@2
+    - task: Bash@3
       displayName: Setup Private Feeds Credentials
       inputs:
-        filePath: $(Build.SourcesDirectory)/eng/common/SetupNugetSources.ps1
-        arguments: -ConfigFile $(Build.SourcesDirectory)/NuGet.config -Password $Env:Token
+        filePath: $(Build.SourcesDirectory)/eng/common/SetupNugetSources.sh
+        arguments: $(Build.SourcesDirectory)/NuGet.config $Token
       env:
         Token: $(dn-bot-dnceng-artifact-feeds-rw)
-  - task: PowerShell@2
+  - bash: sudo apt-get update
+  - bash: sudo apt-get install -y libxml2
+  - bash: . 'eng/cibuild_bootstrapped_msbuild.sh' --onlyDocChanged $(onlyDocChanged) --skipTests --stage2Properties '/mt'
     displayName: 'Build with bootstrapped MSBuild and -mt mode'
-    inputs:
-      filePath: $(Build.SourcesDirectory)/eng/cibuild_bootstrapped_msbuild.ps1
-      arguments: -msbuildEngine dotnet -onlyDocChanged $(onlyDocChanged) -skipTests -stage2Properties '/mt'
     condition: eq(variables.onlyDocChanged, 0)
     env:
       MSBUILDUSESERVER: "1"
   - task: PublishBuildArtifacts@1
     displayName: 'Publish Artifact: logs'
     inputs:
       PathtoPublish: 'artifacts/log/Debug'
-      ArtifactName: 'MTModeOnWindows build logs'
+      ArtifactName: 'MTModeOnLinux build logs'
     continueOnError: true
     condition: always()
 
diff --git a/eng/cibuild_bootstrapped_msbuild.sh b/eng/cibuild_bootstrapped_msbuild.sh
@@ -4,8 +4,10 @@ configuration="Debug"
 host_type="core"
 build_stage1=true
 onlyDocChanged=0
+skipTests=false
 properties=
 extra_properties=
+stage2Properties=
 
 SOURCE="${BASH_SOURCE[0]}"
 while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
@@ -34,6 +36,14 @@ while [[ $# -gt 0 ]]; do
       onlyDocChanged=$2
       shift 2
       ;;
+    --skiptests)
+      skipTests=true
+      shift 1
+      ;;
+    --stage2properties)
+      stage2Properties=$2
+      shift 2
+      ;;
     *)
       properties="$properties $1"
       shift 1
@@ -88,10 +98,15 @@ export DOTNET_HOST_PATH="$_InitializeDotNetCli/dotnet"
 # When using bootstrapped MSBuild:
 # - Turn off node reuse (so that bootstrapped MSBuild processes don't stay running and lock files)
 # - Create bootstrap environment as it's required when also running tests
+# - stage2Properties are passed to all Stage 2 builds since some MSBuild switches (like /mt) may not work with the SDK MSBuild used in Stage 1
 if [ $onlyDocChanged = 0 ]
 then
-    . "$ScriptRoot/common/build.sh" --restore --build --test --ci --nodereuse false --configuration $configuration $properties $extra_properties
-
+    if [ "$skipTests" = true ]
+    then
+        . "$ScriptRoot/common/build.sh" --restore --build --ci --nodereuse false --configuration $configuration $properties $extra_properties $stage2Properties
+    else
+        . "$ScriptRoot/common/build.sh" --restore --build --test --ci --nodereuse false --configuration $configuration $properties $extra_properties $stage2Properties
+    fi
 else
-    . "$ScriptRoot/common/build.sh" --restore --build --ci --nodereuse false --configuration $configuration /p:CreateBootstrap=false $properties $extra_properties
+    . "$ScriptRoot/common/build.sh" --restore --build --ci --nodereuse false --configuration $configuration /p:CreateBootstrap=false $properties $extra_properties $stage2Properties
 fi
