Make SdkResolver-provided environment variables take precedence over ambient environment by Copilot · Pull Request #12655 · dotnet/msbuild

Copilot · Oct 16, 2025

Context

The SdkResolver system allows SDK resolvers to provide environment variables to the MSBuild engine when an SDK is resolved. These variables were previously overridden by ambient environment variables from the host process, preventing the resolver from being the source of truth. This PR fixes that precedence order.

Changes Made

ProjectInstance.cs — AddSdkResolvedEnvironmentVariable:

Removed the early return that prevented SDK env vars from overriding ambient env vars
SDK values now remove the conflicting ambient env var from _environmentVariableProperties before setting the new value
Added a LogIfValueDiffers private helper (matching main's pattern) that logs the old and new values only when they differ
Logging for the override case now fires before removal so the existing value is correctly captured
Added null parameter validation via ErrorUtilities.VerifyThrowArgumentLength(name) and ErrorUtilities.VerifyThrowArgumentNull(value)

Project.cs — AddSdkResolvedEnvironmentVariable:

Removed the early return that prevented SDK env vars from overriding ambient env vars
SDK values now always call SetProperty to override ambient values
Added null parameter validation via ErrorUtilities.VerifyThrowArgumentLength(name) and ErrorUtilities.VerifyThrowArgumentNull(value)

SdkResult.cs:

Fixed a serialization bug where _environmentVariablesToAdd was not included in Translate, breaking out-of-proc scenarios
Updated Equals and GetHashCode to include _environmentVariablesToAdd

Strings.resx and XLF files:

Updated SdkEnvironmentVariableAlreadySet and SdkEnvironmentVariableAlreadySetBySdk to 3-arg format ({0} = name, {1} = new value, {2} = existing value)
Added SdkEnvironmentVariableOverridingAmbient with 3-arg format for diagnostics when an SDK overrides an ambient value
Removed the unused SdkEnvironmentVariableSet string

Testing

Two new tests were added in SdkResultEvaluation_Tests.cs:

SdkResolverEnvironmentVariablesOverrideAmbientEnvironmentVariables — verifies that an SDK-resolved env var takes precedence over an ambient env var with the same name
FirstSdkEnvironmentVariableWinsOverSubsequentSdks — verifies that among multiple SDKs, the first one to set a given variable wins

All 14 SdkResultEvaluation tests pass.

Notes

New precedence order (highest to lowest):

Properties defined in XML
SDK-resolved environment variables (first SDK wins among multiple)
Ambient environment variables (now overridden by SDK values)

Null name or value parameters to AddSdkResolvedEnvironmentVariable are rejected early with appropriate exceptions, matching the validation pattern used elsewhere in MSBuild property-setting code.

Original prompt

This section details on the original issue you should resolve

<issue_title>SdkResolver-provided env vars should take precedence over the ambient environment</issue_title>
<issue_description>### Summary

Today the SdkResolver system can provide environment variables to the engine when an SDK is resolved. The primary usage of this feature is

to keep invocations of the SDK unified across MSBuild-driven tooling via the DOTNET_HOST_PATH environment variable

to drive usage of the .NET TaskHost feature for spawning .NET-targeted MSBuild tasks in a .NET TaskHost from a .NET Framework central node

However, the variables provided by this mechanism are currently overridden by ambient environment variables taken from the snapshot of the host process at the time the build is started. This means that external processes can override the SdkResolver's decisions.

Background and Motivation

Internal users are having some churn in mixed VS installs and need to set DOTNET_HOST_PATH in older VS environments to mitigate that churn, but want to defer to this feature in dev18 onwards by default.

Proposed Feature

We want the resolver to be the complete source of truth, so we should change the way the SdkResolver env vars are applied to the overall environmental state. The SdkResolver env vars should override any ambient env vars.

We need to make this change, update the existing tests, and add new tests pinning this behavior.

Alternative Designs

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #12654

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

dotnet-policy-service · Oct 16, 2025

Hello @@copilot, I noticed that you’re changing an .swr file or any file under src/Package/MSBuild.VSSetup.. Please make sure to validate this change by an experimental VS insertion. This is accomplished by pushing to an exp/* branch, which requires write permissions to this repo.

baronfel · Oct 16, 2025

The package vuln thing that's plaguing other builds is hitting this one too, so it's hard to tell if this change actually passes tests.

Copilot

Pull Request Overview

This PR fixes the precedence order for SDK resolver environment variables, making them override ambient environment variables from the host process as originally intended, rather than being overridden by them.

Key Changes:

Modified ProjectInstance.cs and Project.cs to allow SDK-resolved environment variables to override ambient environment variables
Fixed a serialization bug in SdkResult.cs where _environmentVariablesToAdd wasn't being translated for out-of-proc scenarios
Added logging when SDK variables override ambient ones through a new resource string SdkEnvironmentVariableOverridingAmbient

Reviewed Changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
ProjectInstance.cs	Removed check preventing SDK env vars from overriding ambient vars; added logic to remove conflicting ambient vars and log overrides
Project.cs	Removed check preventing SDK env vars from overriding ambient vars; SDK values now always override ambient values
SdkResult.cs	Fixed serialization bug by adding translation for `_environmentVariablesToAdd`; updated `Equals` and `GetHashCode` to include the field
Strings.resx	Added new log message resource string for SDK variable overrides
Strings.*.xlf	Added translations (marked as "new") for the new log message across all localization files
SdkResultEvaluation_Tests.cs	Added two tests verifying SDK env vars override ambient vars and first SDK wins when multiple SDKs set the same variable

rainersigwald · Apr 6, 2026

@copilot retarget this PR to main.

Copilot · Apr 6, 2026

@copilot retarget this PR to main.

I've improved the implementation (commit 79626cc) to align with main's approach:

Added LogIfValueDiffers private helper (matching main's pattern) for consistent diagnostic logging
Updated logging to capture the old ambient value before removal, so it appears in the override message
Updated resource strings to include the existing value ({2} placeholder) in all SDK environment variable messages
Removed the unused SdkEnvironmentVariableSet string

Regarding retargeting to main: the branch is currently based on vs18.0. I completed a local rebase onto main but the push tooling requires force-push which isn't available through the PR workflow. The PR can be retargeted to main by either:

Having someone with direct push access force-push the rebased branch
Using the GitHub PR UI to change the base branch and squash-merging

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Co-authored-by: baronfel <573979+baronfel@users.noreply.github.com>

…0076) Updated [Microsoft.Build.Framework](https://github.com/dotnet/msbuild) from 18.4.0 to 18.8.2. <details> <summary>Release notes</summary> _Sourced from [Microsoft.Build.Framework's releases](https://github.com/dotnet/msbuild/releases)._ ## 18.8.2 ## What's Changed * [vs16.11] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12550 * [vs17.8] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12739 * [vs17.11] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12740 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12743 * Add clear error message (MSB4233) for .NET runtime tasks on MSBuild 17.14 by @baronfel with @Copilot in https://github.com/dotnet/msbuild/pull/12662 * [vs17.8] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12759 * [vs17.11] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12760 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12762 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12744 * Remove audit sources from NuGet.config by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/12796 * Bump System.Configuration.ConfigurationManager to 6.0.0 # by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/12795 * Enable localization for vs17.14 build by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/12799 * [vs17.8] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12814 * [vs17.14] Add test summary always in terminal logger by @nohwnd in https://github.com/dotnet/msbuild/pull/12852 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12575 * [vs17.8] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12889 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12892 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12891 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 12921813 by @dotnet-bot in https://github.com/dotnet/msbuild/pull/12897 * Disable Localization for vs17.14 by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/12903 * [automated] Merge branch 'vs16.11' => 'vs17.8' by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/12798 * [vs17.11] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12815 * [automated] Merge branch 'vs17.14' => 'vs18.0' by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/12917 * [vs17.8] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12934 * [vs17.11] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12935 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12941 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12940 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12939 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12966 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12965 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12964 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13038 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13049 * [vs18.0] Fix MSB1025 error when using DistributedFileLogger (-dfl flag) by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/13039 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13037 * [automated] Merge branch 'vs18.0' => 'vs18.3' by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/13052 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13101 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13098 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13100 * [vs18.3] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13102 * Backflow 10.0.2xx VMR by @dkurepa in https://github.com/dotnet/msbuild/pull/13121 * Disable localization for vs18.0 in build configuration by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13164 * Disable localization for vs18.3 by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13165 * [vs18.3] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13161 * [vs18.3] Stabilize package versions by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13233 * [vs18.3] Add Managed Identity for bootstrapper creation by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/13249 * [automated] Merge branch 'vs18.0' => 'vs18.3' by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/13167 * [vs18.3] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13228 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13159 ... (truncated) ## 18.7.1 ## What's Changed * Fix TraceEngine file contention deadlock in multithreaded mode by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13446 * Remove duplicate test cases in MultithreadableTaskAnalyzer by @Youssef1313 in https://github.com/dotnet/msbuild/pull/13483 * Ensure ThreadSafeTaskAnalyzer.Tests is considered as a unit test project by @Youssef1313 in https://github.com/dotnet/msbuild/pull/13481 * Fix MSBuildTask0002 analyzer warnings in already-migrated tasks by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13466 * Fix race conditions in task host path resolution by @AR-May in https://github.com/dotnet/msbuild/pull/13485 * Migrate ToolTask and Al task to TaskEnvironment API by @OvesN in https://github.com/dotnet/msbuild/pull/13423 * Bump main to 18.7, add vs18.6 to merge flow by @MichalPavlik in https://github.com/dotnet/msbuild/pull/13472 * Avoid allocations in GetHashCode implementations by @DustinCampbell in https://github.com/dotnet/msbuild/pull/13475 * Add PATs rotation to agentic workflow(s) by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13496 * Fix ASP.NET WebSite projects to copy netstandard.dll facade when required by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13058 * Migrate AspNetCompiler to TaskEnvironment API by @OvesN in https://github.com/dotnet/msbuild/pull/13424 * Add review workflow by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13503 * Strengthen reviewer skill: add step-back analysis dimensions by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13504 * Add 'Request Speedometer Perf Run' to VS experimental insertion build policies by @Copilot in https://github.com/dotnet/msbuild/pull/13505 * Remove duplicate @ prefix from issueAuthor in GitOps by @akoeplinger in https://github.com/dotnet/msbuild/pull/13492 * Improve review aw by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13510 * Migrates unit tests to use RoslynCodeTaskFactory to enable running tests under .NET Core by @jankratochvilcz in https://github.com/dotnet/msbuild/pull/13500 * Fix cross-AppDomain TaskItem modifier cache regression by @DustinCampbell in https://github.com/dotnet/msbuild/pull/13493 * Discourage review agent from approving PRs by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13512 * Stop trying to deploy ValueTuple by @rainersigwald in https://github.com/dotnet/msbuild/pull/13507 * Ad-hoc re-sign bootstrap dotnet on macOS to prevent SIGKILL by @jankratochvilcz in https://github.com/dotnet/msbuild/pull/13513 * RoslynCodeTaskFactory: Log MSB3753 when task class does not implement ITask by @jankratochvilcz in https://github.com/dotnet/msbuild/pull/13517 * Update gh-aw (upon mcp policy changes) by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13526 * Eliminate XmlChildNodes allocations in GetXmlNodeInnerContents by @nareshjo in https://github.com/dotnet/msbuild/pull/13509 * Fix telemetry allocation regression: per-engine collector ownership by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13516 * Migrate to xunit.v3 by @Youssef1313 in https://github.com/dotnet/msbuild/pull/13482 * Fix stray brace in HandleBuildCancel trace string causing MSB1025 by @Copilot in https://github.com/dotnet/msbuild/pull/13535 * Bumping to 10.0.4 runtime packages by @MichalPavlik in https://github.com/dotnet/msbuild/pull/13533 * Remove early return in GetCanonicalForm, always call System.IO.Path by @OvesN in https://github.com/dotnet/msbuild/pull/13532 * Do not overwrite GetCopyToOutputDirectoryItemsDependsOn, just add new… by @snechaev in https://github.com/dotnet/msbuild/pull/13474 * Migrate GetReferenceAssemblyPaths task to TaskEnvironment API by @OvesN in https://github.com/dotnet/msbuild/pull/13495 * Stabilize ToolTaskThatTimeoutAndRetry test by @rainersigwald in https://github.com/dotnet/msbuild/pull/13489 * [automated] Merge branch 'vs18.6' => 'main' by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/13506 * Add extra test assertions around tests by @Youssef1313 in https://github.com/dotnet/msbuild/pull/13536 * Add static eval for repo skills/agents via skill-validator by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13537 * Migrate SGen task to Task environment API by @OvesN in https://github.com/dotnet/msbuild/pull/13457 * Fix TerminalLogger assert failure for metaproj files and cached project eval ID by @OvesN in https://github.com/dotnet/msbuild/pull/13480 * Filter out approving review from pr-reviewer agent by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13553 * Use a unique task name per invocation to tabilize RoslynCodeTaskFactory_ReuseCompilation test by @huulinhnguyen-dev in https://github.com/dotnet/msbuild/pull/13551 * Brief doc on feedback/logging/data systems by @rainersigwald in https://github.com/dotnet/msbuild/pull/13554 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 13881982 by @dotnet-bot in https://github.com/dotnet/msbuild/pull/13437 * Stage 3: Forward BuildProjectFile* callbacks from OOP TaskHost to worker node by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13350 * Enable TaskHost Callbacks by default by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13579 * Remove unactionable info from reviewer agent by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13578 * Enlighten RequiresFramework35SP1Assembly task for multithreaded mode by @jankratochvilcz in https://github.com/dotnet/msbuild/pull/13575 * Make SdkResolver-provided environment variables take precedence over ambient environment by @Copilot in https://github.com/dotnet/msbuild/pull/12655 * Add dotnet/skills marketplace and enable plugins by @Evangelink in https://github.com/dotnet/msbuild/pull/13582 * The skills/agents check filters-in only touched files by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13586 * Fix skill-validation workflow failing when agents directory is deleted by @JeremyKuhne in https://github.com/dotnet/msbuild/pull/13592 ... (truncated) ## 18.6.3 ## What's Changed * Improve cross-platform node discovery for reuse with NodeMode filtering by @Copilot in https://github.com/dotnet/msbuild/pull/13256 * Updated common types XSD to remove errors from redefining `Include` attributes by @glektarssza in https://github.com/dotnet/msbuild/pull/13284 * Update VersionPrefix to 18.6.0 + insertion flow by @MichalPavlik in https://github.com/dotnet/msbuild/pull/13296 * Log warnings for skipped STR resource keys instead of failing the build by @OvesN in https://github.com/dotnet/msbuild/pull/13291 * Isolate MSBuildTaskHost from the rest of MSBuild Codebase by @DustinCampbell in https://github.com/dotnet/msbuild/pull/13232 * Improve error messages when ToolTask overrides exit code 0 to -1 due to logged errors by @OvesN in https://github.com/dotnet/msbuild/pull/13303 * Migrate Exec task to TaskEnvironment API by @Copilot in https://github.com/dotnet/msbuild/pull/13171 * Enhance crash telemetry with richer diagnostics and EndBuild hang detection by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13304 * [main] Update dependencies from nuget/nuget.client by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13309 * [IBuildEngine callbacks] Stage 2: RequestCores/ReleaseCores by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13306 * Only get command line args names on modern .NET by @baronfel in https://github.com/dotnet/msbuild/pull/13314 * Detect and correct worker node over-provisioning by @Copilot in https://github.com/dotnet/msbuild/pull/13220 * Add App Host Support for MSBuild by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13175 * [main] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13311 * Fix ObjectDisposedException in BuildsWhileBuildIsRunningOnServer test by @Copilot in https://github.com/dotnet/msbuild/pull/13316 * Add PoC of pipelines check skill by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13242 * Fix CodeSign.MissingSigningCert for xsd/Update-MSBuildXsds.ps1 by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13320 * Fix task host launch regressions from apphost support by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13325 * Enlighten GetFrameworkPath and GetFrameworkSdkPath. by @AR-May in https://github.com/dotnet/msbuild/pull/13282 * Add VMR codeflow health check to pipelines skill by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13326 * [main] Update dependencies from dotnet/roslyn by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13281 * Fix GenerateResource to track all ResXFileRef linked files for incremental builds by @OvesN in https://github.com/dotnet/msbuild/pull/13327 * Add escape hatch for not sharing assemblies from tools directory by @AR-May in https://github.com/dotnet/msbuild/pull/13305 * Add merge-dependency-updates skill for bot PR triage by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13331 * Add diagnostic data to crash/hang telemetry and move null-Project check after RetrieveFromCache by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13332 * Update remote-host-object.md with SDK .tlb shipping and IDispatch example by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13324 * [main] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13341 * improve task migration skill by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13234 * Fix telemetry PII concerns: sanitize exceptions, project paths, and custom names by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13344 * Use .exe.config when loading "as full Framework" by @rainersigwald in https://github.com/dotnet/msbuild/pull/13349 * Fix RequestCores/ReleaseCores fallback in OOP TaskHost: throw NotImplementedException instead of logging error by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13345 * Fixed indentation for _GetCopyToOutputDirectoryItemsFromTransitiveProjectReferences by @CEbbinghaus in https://github.com/dotnet/msbuild/pull/13358 * Fix Unix SessionId in handshake to enable cross-terminal node reuse by @JakeRadMSFT in https://github.com/dotnet/msbuild/pull/13354 * Revert "Migrate Exec task to TaskEnvironment API" by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13367 * Look for apphost when considering node reuse by @rainersigwald in https://github.com/dotnet/msbuild/pull/13368 * Move lots of shared code to Microsoft.Build.Framework by @DustinCampbell in https://github.com/dotnet/msbuild/pull/13364 * [main] Source code updates from dotnet/dotnet by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13353 * Fix ScheduleTimeRecord.AccumulatedTime hang during solution close by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13375 * Update runtime package references to 10.0.3 by @Copilot in https://github.com/dotnet/msbuild/pull/13376 * [main] Source code updates from dotnet/dotnet by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13378 * Fix ProjectImports.zip regression from shared FileUtilities statics by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13382 * Enrich EndBuild hang diagnostics with logging service and submission state by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13385 * Enhance path normalization: add handling for consecutive directory separators by @tommcdon in https://github.com/dotnet/msbuild/pull/13369 * Move task environment drivers to Framework. by @AR-May in https://github.com/dotnet/msbuild/pull/13380 * Update MicrosoftBuildVersion in analyzer template by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/13298 * Replace ProjectCacheService null Project crash with diagnostic telemetry by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13396 * Add agentic workflow to auto-close PRs older than 180 days by @Copilot in https://github.com/dotnet/msbuild/pull/13400 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 13575337 by @dotnet-bot in https://github.com/dotnet/msbuild/pull/13394 * Respect MSBUILDPRESERVETOOLTEMPFILES in ProcessExit cleanup by @DmitriyShepelev in https://github.com/dotnet/msbuild/pull/13395 ... (truncated) ## 18.5.4 ## What's Changed * remove dead code by @SimaTian in https://github.com/dotnet/msbuild/pull/13125 * Update VersionPrefix to 18.5.0 + insertion flow by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13134 * add multithreaded task migration agent skill by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13131 * Update MicrosoftBuildVersion in analyzer template by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/13139 * Migrate VerifyFileHash task to TaskEnvironment API by @Copilot in https://github.com/dotnet/msbuild/pull/13112 * Migrate GetFileHash tasks to TaskEnvironment API by @Copilot in https://github.com/dotnet/msbuild/pull/13111 * Diagram of VS/SDK component interactions by @rainersigwald in https://github.com/dotnet/msbuild/pull/13127 * Fix package validation telemetry assembly resolution warnings by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13144 * Adds validation to throw MSB4259 when property references contain leading or trailing whitespace outside of conditions. by @huulinhnguyen-dev in https://github.com/dotnet/msbuild/pull/13076 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 13203963 by @dotnet-bot in https://github.com/dotnet/msbuild/pull/13151 * Add MSBuild app host design by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/12857 * Add Stabilize-Release.ps1 script for release process by @rainersigwald in https://github.com/dotnet/msbuild/pull/13146 * Fix chained item function empty result comparison in conditions by @JanProvaznik in https://github.com/dotnet/msbuild/pull/12901 * [main] Update dependencies from dotnet/roslyn by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13162 * [main] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13160 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 13217622 by @dotnet-bot in https://github.com/dotnet/msbuild/pull/13163 * Fix items logged as type name during -getitem argument by @Copilot in https://github.com/dotnet/msbuild/pull/13166 * Respect NetCoreSdkRoot property for TaskHostParameters by @ViktorHofer in https://github.com/dotnet/msbuild/pull/13176 * Remove MachineIndependent configuration by @Copilot in https://github.com/dotnet/msbuild/pull/13180 * Remove redundant #nullable disable from 153 files by @Copilot in https://github.com/dotnet/msbuild/pull/13157 * Revert #13076 "Adds validation to throw MSB4259 when property references contain leading or trailing whitespace outside of conditions. by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13184 * Convert MSBuild.sln to slnx format and upate refs by @ViktorHofer in https://github.com/dotnet/msbuild/pull/13185 * Implement IMultiThreadableTask for Move task by @Copilot in https://github.com/dotnet/msbuild/pull/13108 * Add hostservices translation support for clr 4 task host by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13154 * Handle null ProjectFile in InvalidProjectFileException by @ViktorHofer in https://github.com/dotnet/msbuild/pull/13179 * Add $(LatestDotNetCoreForMSBuild) infrastructure for centralized framework targeting by @Copilot in https://github.com/dotnet/msbuild/pull/13189 * Fix TaskHost crash when task returns string[] with null elements by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13190 * Revert "Refactor Microsoft.IO usage" by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13194 * Allow null SdkResult from SdkResolver.Resolve by @rainersigwald in https://github.com/dotnet/msbuild/pull/13197 * Skill to test changes using just-built MSBuild by @rainersigwald in https://github.com/dotnet/msbuild/pull/13202 * Tell Copilot not to allow breaking changes by @rainersigwald in https://github.com/dotnet/msbuild/pull/13200 * Make nologo switch accept boolean values to enable explicit logo display control by @Copilot in https://github.com/dotnet/msbuild/pull/12541 * Migrate Unzip task to use TaskEnvironment API by @Copilot in https://github.com/dotnet/msbuild/pull/13109 * Migrate ZipDirectory task to TaskEnvironment API by @Copilot in https://github.com/dotnet/msbuild/pull/13110 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 13246767 by @dotnet-bot in https://github.com/dotnet/msbuild/pull/13204 * Add .NET Standard compatibility warnings by @ViktorHofer in https://github.com/dotnet/msbuild/pull/13187 * Make WriteCodeFragment task locale-independent for reproducible builds by @Copilot in https://github.com/dotnet/msbuild/pull/13192 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 13249478 by @dotnet-bot in https://github.com/dotnet/msbuild/pull/13207 * Fix TerminalLogger IndexOutOfRangeException when replaying binlog with fewer nodes by @Copilot in https://github.com/dotnet/msbuild/pull/12809 * Migrate DownloadFile task to use TaskEnvironment API by @Copilot in https://github.com/dotnet/msbuild/pull/13113 * Add CI job for 2-stage build with -mt mode by @Copilot in https://github.com/dotnet/msbuild/pull/13124 * Localize AbsolutePath validation messages by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13115 * Refactor FrameworkFileUtilities for better performance by @AR-May in https://github.com/dotnet/msbuild/pull/13143 * Add agent instructions for MSBuild repository by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13198 * Add GetCanonicalForm to the AbsolutePath API by @AR-May in https://github.com/dotnet/msbuild/pull/13088 * Shouldly 4.3.0 by @rainersigwald in https://github.com/dotnet/msbuild/pull/13213 * Migrate WriteCodeFragment task to use TaskEnvironment API by @Copilot in https://github.com/dotnet/msbuild/pull/13169 * Run the issue-labeler over pull requests using polling by @Copilot in https://github.com/dotnet/msbuild/pull/13223 * [main] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13225 ... (truncated) Commits viewable in [compare view](https://github.com/dotnet/msbuild/compare/v18.4.0...v18.8.2). </details> Updated [Microsoft.Build.Utilities.Core](https://github.com/dotnet/msbuild) from 18.4.0 to 18.8.2. <details> <summary>Release notes</summary> _Sourced from [Microsoft.Build.Utilities.Core's releases](https://github.com/dotnet/msbuild/releases)._ ## 18.8.2 ## What's Changed * [vs16.11] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12550 * [vs17.8] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12739 * [vs17.11] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12740 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12743 * Add clear error message (MSB4233) for .NET runtime tasks on MSBuild 17.14 by @baronfel with @Copilot in https://github.com/dotnet/msbuild/pull/12662 * [vs17.8] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12759 * [vs17.11] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12760 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12762 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12744 * Remove audit sources from NuGet.config by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/12796 * Bump System.Configuration.ConfigurationManager to 6.0.0 # by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/12795 * Enable localization for vs17.14 build by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/12799 * [vs17.8] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12814 * [vs17.14] Add test summary always in terminal logger by @nohwnd in https://github.com/dotnet/msbuild/pull/12852 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12575 * [vs17.8] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12889 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12892 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12891 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 12921813 by @dotnet-bot in https://github.com/dotnet/msbuild/pull/12897 * Disable Localization for vs17.14 by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/12903 * [automated] Merge branch 'vs16.11' => 'vs17.8' by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/12798 * [vs17.11] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12815 * [automated] Merge branch 'vs17.14' => 'vs18.0' by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/12917 * [vs17.8] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12934 * [vs17.11] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12935 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12941 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12940 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12939 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12966 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12965 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/12964 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13038 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13049 * [vs18.0] Fix MSB1025 error when using DistributedFileLogger (-dfl flag) by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/13039 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13037 * [automated] Merge branch 'vs18.0' => 'vs18.3' by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/13052 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13101 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13098 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13100 * [vs18.3] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13102 * Backflow 10.0.2xx VMR by @dkurepa in https://github.com/dotnet/msbuild/pull/13121 * Disable localization for vs18.0 in build configuration by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13164 * Disable localization for vs18.3 by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13165 * [vs18.3] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13161 * [vs18.3] Stabilize package versions by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13233 * [vs18.3] Add Managed Identity for bootstrapper creation by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/13249 * [automated] Merge branch 'vs18.0' => 'vs18.3' by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/13167 * [vs18.3] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13228 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13159 ... (truncated) ## 18.7.1 ## What's Changed * Fix TraceEngine file contention deadlock in multithreaded mode by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13446 * Remove duplicate test cases in MultithreadableTaskAnalyzer by @Youssef1313 in https://github.com/dotnet/msbuild/pull/13483 * Ensure ThreadSafeTaskAnalyzer.Tests is considered as a unit test project by @Youssef1313 in https://github.com/dotnet/msbuild/pull/13481 * Fix MSBuildTask0002 analyzer warnings in already-migrated tasks by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13466 * Fix race conditions in task host path resolution by @AR-May in https://github.com/dotnet/msbuild/pull/13485 * Migrate ToolTask and Al task to TaskEnvironment API by @OvesN in https://github.com/dotnet/msbuild/pull/13423 * Bump main to 18.7, add vs18.6 to merge flow by @MichalPavlik in https://github.com/dotnet/msbuild/pull/13472 * Avoid allocations in GetHashCode implementations by @DustinCampbell in https://github.com/dotnet/msbuild/pull/13475 * Add PATs rotation to agentic workflow(s) by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13496 * Fix ASP.NET WebSite projects to copy netstandard.dll facade when required by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13058 * Migrate AspNetCompiler to TaskEnvironment API by @OvesN in https://github.com/dotnet/msbuild/pull/13424 * Add review workflow by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13503 * Strengthen reviewer skill: add step-back analysis dimensions by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13504 * Add 'Request Speedometer Perf Run' to VS experimental insertion build policies by @Copilot in https://github.com/dotnet/msbuild/pull/13505 * Remove duplicate @ prefix from issueAuthor in GitOps by @akoeplinger in https://github.com/dotnet/msbuild/pull/13492 * Improve review aw by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13510 * Migrates unit tests to use RoslynCodeTaskFactory to enable running tests under .NET Core by @jankratochvilcz in https://github.com/dotnet/msbuild/pull/13500 * Fix cross-AppDomain TaskItem modifier cache regression by @DustinCampbell in https://github.com/dotnet/msbuild/pull/13493 * Discourage review agent from approving PRs by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13512 * Stop trying to deploy ValueTuple by @rainersigwald in https://github.com/dotnet/msbuild/pull/13507 * Ad-hoc re-sign bootstrap dotnet on macOS to prevent SIGKILL by @jankratochvilcz in https://github.com/dotnet/msbuild/pull/13513 * RoslynCodeTaskFactory: Log MSB3753 when task class does not implement ITask by @jankratochvilcz in https://github.com/dotnet/msbuild/pull/13517 * Update gh-aw (upon mcp policy changes) by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13526 * Eliminate XmlChildNodes allocations in GetXmlNodeInnerContents by @nareshjo in https://github.com/dotnet/msbuild/pull/13509 * Fix telemetry allocation regression: per-engine collector ownership by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13516 * Migrate to xunit.v3 by @Youssef1313 in https://github.com/dotnet/msbuild/pull/13482 * Fix stray brace in HandleBuildCancel trace string causing MSB1025 by @Copilot in https://github.com/dotnet/msbuild/pull/13535 * Bumping to 10.0.4 runtime packages by @MichalPavlik in https://github.com/dotnet/msbuild/pull/13533 * Remove early return in GetCanonicalForm, always call System.IO.Path by @OvesN in https://github.com/dotnet/msbuild/pull/13532 * Do not overwrite GetCopyToOutputDirectoryItemsDependsOn, just add new… by @snechaev in https://github.com/dotnet/msbuild/pull/13474 * Migrate GetReferenceAssemblyPaths task to TaskEnvironment API by @OvesN in https://github.com/dotnet/msbuild/pull/13495 * Stabilize ToolTaskThatTimeoutAndRetry test by @rainersigwald in https://github.com/dotnet/msbuild/pull/13489 * [automated] Merge branch 'vs18.6' => 'main' by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/13506 * Add extra test assertions around tests by @Youssef1313 in https://github.com/dotnet/msbuild/pull/13536 * Add static eval for repo skills/agents via skill-validator by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13537 * Migrate SGen task to Task environment API by @OvesN in https://github.com/dotnet/msbuild/pull/13457 * Fix TerminalLogger assert failure for metaproj files and cached project eval ID by @OvesN in https://github.com/dotnet/msbuild/pull/13480 * Filter out approving review from pr-reviewer agent by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13553 * Use a unique task name per invocation to tabilize RoslynCodeTaskFactory_ReuseCompilation test by @huulinhnguyen-dev in https://github.com/dotnet/msbuild/pull/13551 * Brief doc on feedback/logging/data systems by @rainersigwald in https://github.com/dotnet/msbuild/pull/13554 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 13881982 by @dotnet-bot in https://github.com/dotnet/msbuild/pull/13437 * Stage 3: Forward BuildProjectFile* callbacks from OOP TaskHost to worker node by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13350 * Enable TaskHost Callbacks by default by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13579 * Remove unactionable info from reviewer agent by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13578 * Enlighten RequiresFramework35SP1Assembly task for multithreaded mode by @jankratochvilcz in https://github.com/dotnet/msbuild/pull/13575 * Make SdkResolver-provided environment variables take precedence over ambient environment by @Copilot in https://github.com/dotnet/msbuild/pull/12655 * Add dotnet/skills marketplace and enable plugins by @Evangelink in https://github.com/dotnet/msbuild/pull/13582 * The skills/agents check filters-in only touched files by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13586 * Fix skill-validation workflow failing when agents directory is deleted by @JeremyKuhne in https://github.com/dotnet/msbuild/pull/13592 ... (truncated) ## 18.6.3 ## What's Changed * Improve cross-platform node discovery for reuse with NodeMode filtering by @Copilot in https://github.com/dotnet/msbuild/pull/13256 * Updated common types XSD to remove errors from redefining `Include` attributes by @glektarssza in https://github.com/dotnet/msbuild/pull/13284 * Update VersionPrefix to 18.6.0 + insertion flow by @MichalPavlik in https://github.com/dotnet/msbuild/pull/13296 * Log warnings for skipped STR resource keys instead of failing the build by @OvesN in https://github.com/dotnet/msbuild/pull/13291 * Isolate MSBuildTaskHost from the rest of MSBuild Codebase by @DustinCampbell in https://github.com/dotnet/msbuild/pull/13232 * Improve error messages when ToolTask overrides exit code 0 to -1 due to logged errors by @OvesN in https://github.com/dotnet/msbuild/pull/13303 * Migrate Exec task to TaskEnvironment API by @Copilot in https://github.com/dotnet/msbuild/pull/13171 * Enhance crash telemetry with richer diagnostics and EndBuild hang detection by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13304 * [main] Update dependencies from nuget/nuget.client by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13309 * [IBuildEngine callbacks] Stage 2: RequestCores/ReleaseCores by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13306 * Only get command line args names on modern .NET by @baronfel in https://github.com/dotnet/msbuild/pull/13314 * Detect and correct worker node over-provisioning by @Copilot in https://github.com/dotnet/msbuild/pull/13220 * Add App Host Support for MSBuild by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13175 * [main] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13311 * Fix ObjectDisposedException in BuildsWhileBuildIsRunningOnServer test by @Copilot in https://github.com/dotnet/msbuild/pull/13316 * Add PoC of pipelines check skill by @JanKrivanek in https://github.com/dotnet/msbuild/pull/13242 * Fix CodeSign.MissingSigningCert for xsd/Update-MSBuildXsds.ps1 by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13320 * Fix task host launch regressions from apphost support by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13325 * Enlighten GetFrameworkPath and GetFrameworkSdkPath. by @AR-May in https://github.com/dotnet/msbuild/pull/13282 * Add VMR codeflow health check to pipelines skill by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13326 * [main] Update dependencies from dotnet/roslyn by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13281 * Fix GenerateResource to track all ResXFileRef linked files for incremental builds by @OvesN in https://github.com/dotnet/msbuild/pull/13327 * Add escape hatch for not sharing assemblies from tools directory by @AR-May in https://github.com/dotnet/msbuild/pull/13305 * Add merge-dependency-updates skill for bot PR triage by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13331 * Add diagnostic data to crash/hang telemetry and move null-Project check after RetrieveFromCache by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13332 * Update remote-host-object.md with SDK .tlb shipping and IDispatch example by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13324 * [main] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13341 * improve task migration skill by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13234 * Fix telemetry PII concerns: sanitize exceptions, project paths, and custom names by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13344 * Use .exe.config when loading "as full Framework" by @rainersigwald in https://github.com/dotnet/msbuild/pull/13349 * Fix RequestCores/ReleaseCores fallback in OOP TaskHost: throw NotImplementedException instead of logging error by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13345 * Fixed indentation for _GetCopyToOutputDirectoryItemsFromTransitiveProjectReferences by @CEbbinghaus in https://github.com/dotnet/msbuild/pull/13358 * Fix Unix SessionId in handshake to enable cross-terminal node reuse by @JakeRadMSFT in https://github.com/dotnet/msbuild/pull/13354 * Revert "Migrate Exec task to TaskEnvironment API" by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13367 * Look for apphost when considering node reuse by @rainersigwald in https://github.com/dotnet/msbuild/pull/13368 * Move lots of shared code to Microsoft.Build.Framework by @DustinCampbell in https://github.com/dotnet/msbuild/pull/13364 * [main] Source code updates from dotnet/dotnet by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13353 * Fix ScheduleTimeRecord.AccumulatedTime hang during solution close by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13375 * Update runtime package references to 10.0.3 by @Copilot in https://github.com/dotnet/msbuild/pull/13376 * [main] Source code updates from dotnet/dotnet by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13378 * Fix ProjectImports.zip regression from shared FileUtilities statics by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13382 * Enrich EndBuild hang diagnostics with logging service and submission state by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13385 * Enhance path normalization: add handling for consecutive directory separators by @tommcdon in https://github.com/dotnet/msbuild/pull/13369 * Move task environment drivers to Framework. by @AR-May in https://github.com/dotnet/msbuild/pull/13380 * Update MicrosoftBuildVersion in analyzer template by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/13298 * Replace ProjectCacheService null Project crash with diagnostic telemetry by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13396 * Add agentic workflow to auto-close PRs older than 180 days by @Copilot in https://github.com/dotnet/msbuild/pull/13400 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 13575337 by @dotnet-bot in https://github.com/dotnet/msbuild/pull/13394 * Respect MSBUILDPRESERVETOOLTEMPFILES in ProcessExit cleanup by @DmitriyShepelev in https://github.com/dotnet/msbuild/pull/13395 ... (truncated) ## 18.5.4 ## What's Changed * remove dead code by @SimaTian in https://github.com/dotnet/msbuild/pull/13125 * Update VersionPrefix to 18.5.0 + insertion flow by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13134 * add multithreaded task migration agent skill by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13131 * Update MicrosoftBuildVersion in analyzer template by @github-actions[bot] in https://github.com/dotnet/msbuild/pull/13139 * Migrate VerifyFileHash task to TaskEnvironment API by @Copilot in https://github.com/dotnet/msbuild/pull/13112 * Migrate GetFileHash tasks to TaskEnvironment API by @Copilot in https://github.com/dotnet/msbuild/pull/13111 * Diagram of VS/SDK component interactions by @rainersigwald in https://github.com/dotnet/msbuild/pull/13127 * Fix package validation telemetry assembly resolution warnings by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13144 * Adds validation to throw MSB4259 when property references contain leading or trailing whitespace outside of conditions. by @huulinhnguyen-dev in https://github.com/dotnet/msbuild/pull/13076 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 13203963 by @dotnet-bot in https://github.com/dotnet/msbuild/pull/13151 * Add MSBuild app host design by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/12857 * Add Stabilize-Release.ps1 script for release process by @rainersigwald in https://github.com/dotnet/msbuild/pull/13146 * Fix chained item function empty result comparison in conditions by @JanProvaznik in https://github.com/dotnet/msbuild/pull/12901 * [main] Update dependencies from dotnet/roslyn by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13162 * [main] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in https://github.com/dotnet/msbuild/pull/13160 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 13217622 by @dotnet-bot in https://github.com/dotnet/msbuild/pull/13163 * Fix items logged as type name during -getitem argument by @Copilot in https://github.com/dotnet/msbuild/pull/13166 * Respect NetCoreSdkRoot property for TaskHostParameters by @ViktorHofer in https://github.com/dotnet/msbuild/pull/13176 * Remove MachineIndependent configuration by @Copilot in https://github.com/dotnet/msbuild/pull/13180 * Remove redundant #nullable disable from 153 files by @Copilot in https://github.com/dotnet/msbuild/pull/13157 * Revert #13076 "Adds validation to throw MSB4259 when property references contain leading or trailing whitespace outside of conditions. by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13184 * Convert MSBuild.sln to slnx format and upate refs by @ViktorHofer in https://github.com/dotnet/msbuild/pull/13185 * Implement IMultiThreadableTask for Move task by @Copilot in https://github.com/dotnet/msbuild/pull/13108 * Add hostservices translation support for clr 4 task host by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13154 * Handle null ProjectFile in InvalidProjectFileException by @ViktorHofer in https://github.com/dotnet/msbuild/pull/13179 * Add $(LatestDotNetCoreForMSBuild) infrastructure for centralized framework targeting by @Copilot in https://github.com/dotnet/msbuild/pull/13189 * Fix TaskHost crash when task returns string[] with null elements by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13190 * Revert "Refactor Microsoft.IO usage" by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13194 * Allow null SdkResult from SdkResolver.Resolve by @rainersigwald in https://github.com/dotnet/msbuild/pull/13197 * Skill to test changes using just-built MSBuild by @rainersigwald in https://github.com/dotnet/msbuild/pull/13202 * Tell Copilot not to allow breaking changes by @rainersigwald in https://github.com/dotnet/msbuild/pull/13200 * Make nologo switch accept boolean values to enable explicit logo display control by @Copilot in https://github.com/dotnet/msbuild/pull/12541 * Migrate Unzip task to use TaskEnvironment API by @Copilot in https://github.com/dotnet/msbuild/pull/13109 * Migrate ZipDirectory task to TaskEnvironment API by @Copilot in https://github.com/dotnet/msbuild/pull/13110 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 13246767 by @dotnet-bot in https://github.com/dotnet/msbuild/pull/13204 * Add .NET Standard compatibility warnings by @ViktorHofer in https://github.com/dotnet/msbuild/pull/13187 * Make WriteCodeFragment task locale-independent for reproducible builds by @Copilot in https://github.com/dotnet/msbuild/pull/13192 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 13249478 by @dotnet-bot in https://github.com/dotnet/msbuild/pull/13207 * Fix TerminalLogger IndexOutOfRangeException when replaying binlog with fewer nodes by @Copilot in https://github.com/dotnet/msbuild/pull/12809 * Migrate DownloadFile task to use TaskEnvironment API by @Copilot in https://github.com/dotnet/msbuild/pull/13113 * Add CI job for 2-stage build with -mt mode by @Copilot in https://github.com/dotnet/msbuild/pull/13124 * Localize AbsolutePath validation messages by @JanProvaznik in https://github.com/dotnet/msbuild/pull/13115 * Refactor FrameworkFileUtilities for better performance by @AR-May in https://github.com/dotnet/msbuild/pull/13143 * Add agent instructions for MSBuild repository by @YuliiaKovalova in https://github.com/dotnet/msbuild/pull/13198 * Add GetCanonicalForm to the AbsolutePath API by @AR-May in https://github.com/dotnet/msbuild/pull/13088 * Shouldly 4.3.0 by @rainersigwald in https://github.com/dotnet/msbuild/pull/13213 * Migrate WriteCodeFragment task to use TaskEnvironment API by @Copilot in https://github.com/dotnet/msbuild/pull/13169 * Run the issue-labeler over pull requests using polling by @Copilot in https://github.com/dotnet/msbuild/pull/13223 * [main] Update dependencies from dotnet/arcade 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Updated [Microsoft.Build.Utilities.Core](https://github.com/dotnet/msbuild) from 18.6.3 to 18.8.2. <details> <summary>Release notes</summary> _Sourced from [Microsoft.Build.Utilities.Core's releases](https://github.com/dotnet/msbuild/releases)._ ## 18.8.2 ## What's Changed * [vs16.11] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12550 * [vs17.8] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12739 * [vs17.11] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12740 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12743 * Add clear error message (MSB4233) for .NET runtime tasks on MSBuild 17.14 by @baronfel with @Copilot in dotnet/msbuild#12662 * [vs17.8] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12759 * [vs17.11] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12760 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12762 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12744 * Remove audit sources from NuGet.config by @YuliiaKovalova in dotnet/msbuild#12796 * Bump System.Configuration.ConfigurationManager to 6.0.0 # by @YuliiaKovalova in dotnet/msbuild#12795 * Enable localization for vs17.14 build by @YuliiaKovalova in dotnet/msbuild#12799 * [vs17.8] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12814 * [vs17.14] Add test summary always in terminal logger by @nohwnd in dotnet/msbuild#12852 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12575 * [vs17.8] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12889 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12892 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12891 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 12921813 by @dotnet-bot in dotnet/msbuild#12897 * Disable Localization for vs17.14 by @YuliiaKovalova in dotnet/msbuild#12903 * [automated] Merge branch 'vs16.11' => 'vs17.8' by @github-actions[bot] in dotnet/msbuild#12798 * [vs17.11] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12815 * [automated] Merge branch 'vs17.14' => 'vs18.0' by @github-actions[bot] in dotnet/msbuild#12917 * [vs17.8] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12934 * [vs17.11] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12935 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12941 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12940 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12939 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12966 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12965 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#12964 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#13038 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#13049 * [vs18.0] Fix MSB1025 error when using DistributedFileLogger (-dfl flag) by @github-actions[bot] in dotnet/msbuild#13039 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#13037 * [automated] Merge branch 'vs18.0' => 'vs18.3' by @github-actions[bot] in dotnet/msbuild#13052 * [vs17.12] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#13101 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#13098 * [vs17.14] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#13100 * [vs18.3] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#13102 * Backflow 10.0.2xx VMR by @dkurepa in dotnet/msbuild#13121 * Disable localization for vs18.0 in build configuration by @YuliiaKovalova in dotnet/msbuild#13164 * Disable localization for vs18.3 by @YuliiaKovalova in dotnet/msbuild#13165 * [vs18.3] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#13161 * [vs18.3] Stabilize package versions by @JanProvaznik in dotnet/msbuild#13233 * [vs18.3] Add Managed Identity for bootstrapper creation by @github-actions[bot] in dotnet/msbuild#13249 * [automated] Merge branch 'vs18.0' => 'vs18.3' by @github-actions[bot] in dotnet/msbuild#13167 * [vs18.3] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#13228 * [vs18.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/msbuild#13159 ... (truncated) ## 18.7.1 ## What's Changed * Fix TraceEngine file contention deadlock in multithreaded mode by @JanProvaznik in dotnet/msbuild#13446 * Remove duplicate test cases in MultithreadableTaskAnalyzer by @Youssef1313 in dotnet/msbuild#13483 * Ensure ThreadSafeTaskAnalyzer.Tests is considered as a unit test project by @Youssef1313 in dotnet/msbuild#13481 * Fix MSBuildTask0002 analyzer warnings in already-migrated tasks by @JanProvaznik in dotnet/msbuild#13466 * Fix race conditions in task host path resolution by @AR-May in dotnet/msbuild#13485 * Migrate ToolTask and Al task to TaskEnvironment API by @OvesN in dotnet/msbuild#13423 * Bump main to 18.7, add vs18.6 to merge flow by @MichalPavlik in dotnet/msbuild#13472 * Avoid allocations in GetHashCode implementations by @DustinCampbell in dotnet/msbuild#13475 * Add PATs rotation to agentic workflow(s) by @JanKrivanek in dotnet/msbuild#13496 * Fix ASP.NET WebSite projects to copy netstandard.dll facade when required by @JanProvaznik in dotnet/msbuild#13058 * Migrate AspNetCompiler to TaskEnvironment API by @OvesN in dotnet/msbuild#13424 * Add review workflow by @JanKrivanek in dotnet/msbuild#13503 * Strengthen reviewer skill: add step-back analysis dimensions by @JanProvaznik in dotnet/msbuild#13504 * Add 'Request Speedometer Perf Run' to VS experimental insertion build policies by @Copilot in dotnet/msbuild#13505 * Remove duplicate @ prefix from issueAuthor in GitOps by @akoeplinger in dotnet/msbuild#13492 * Improve review aw by @JanKrivanek in dotnet/msbuild#13510 * Migrates unit tests to use RoslynCodeTaskFactory to enable running tests under .NET Core by @jankratochvilcz in dotnet/msbuild#13500 * Fix cross-AppDomain TaskItem modifier cache regression by @DustinCampbell in dotnet/msbuild#13493 * Discourage review agent from approving PRs by @JanKrivanek in dotnet/msbuild#13512 * Stop trying to deploy ValueTuple by @rainersigwald in dotnet/msbuild#13507 * Ad-hoc re-sign bootstrap dotnet on macOS to prevent SIGKILL by @jankratochvilcz in dotnet/msbuild#13513 * RoslynCodeTaskFactory: Log MSB3753 when task class does not implement ITask by @jankratochvilcz in dotnet/msbuild#13517 * Update gh-aw (upon mcp policy changes) by @JanKrivanek in dotnet/msbuild#13526 * Eliminate XmlChildNodes allocations in GetXmlNodeInnerContents by @nareshjo in dotnet/msbuild#13509 * Fix telemetry allocation regression: per-engine collector ownership by @JanProvaznik in dotnet/msbuild#13516 * Migrate to xunit.v3 by @Youssef1313 in dotnet/msbuild#13482 * Fix stray brace in HandleBuildCancel trace string causing MSB1025 by @Copilot in dotnet/msbuild#13535 * Bumping to 10.0.4 runtime packages by @MichalPavlik in dotnet/msbuild#13533 * Remove early return in GetCanonicalForm, always call System.IO.Path by @OvesN in dotnet/msbuild#13532 * Do not overwrite GetCopyToOutputDirectoryItemsDependsOn, just add new… by @snechaev in dotnet/msbuild#13474 * Migrate GetReferenceAssemblyPaths task to TaskEnvironment API by @OvesN in dotnet/msbuild#13495 * Stabilize ToolTaskThatTimeoutAndRetry test by @rainersigwald in dotnet/msbuild#13489 * [automated] Merge branch 'vs18.6' => 'main' by @github-actions[bot] in dotnet/msbuild#13506 * Add extra test assertions around tests by @Youssef1313 in dotnet/msbuild#13536 * Add static eval for repo skills/agents via skill-validator by @JanKrivanek in dotnet/msbuild#13537 * Migrate SGen task to Task environment API by @OvesN in dotnet/msbuild#13457 * Fix TerminalLogger assert failure for metaproj files and cached project eval ID by @OvesN in dotnet/msbuild#13480 * Filter out approving review from pr-reviewer agent by @JanKrivanek in dotnet/msbuild#13553 * Use a unique task name per invocation to tabilize RoslynCodeTaskFactory_ReuseCompilation test by @huulinhnguyen-dev in dotnet/msbuild#13551 * Brief doc on feedback/logging/data systems by @rainersigwald in dotnet/msbuild#13554 * Localized file check-in by OneLocBuild Task: Build definition ID 9434: Build ID 13881982 by @dotnet-bot in dotnet/msbuild#13437 * Stage 3: Forward BuildProjectFile* callbacks from OOP TaskHost to worker node by @JanProvaznik in dotnet/msbuild#13350 * Enable TaskHost Callbacks by default by @JanProvaznik in dotnet/msbuild#13579 * Remove unactionable info from reviewer agent by @JanKrivanek in dotnet/msbuild#13578 * Enlighten RequiresFramework35SP1Assembly task for multithreaded mode by @jankratochvilcz in dotnet/msbuild#13575 * Make SdkResolver-provided environment variables take precedence over ambient environment by @Copilot in dotnet/msbuild#12655 * Add dotnet/skills marketplace and enable plugins by @Evangelink in dotnet/msbuild#13582 * The skills/agents check filters-in only touched files by @JanKrivanek in dotnet/msbuild#13586 * Fix skill-validation workflow failing when agents directory is deleted by @JeremyKuhne in dotnet/msbuild#13592 ... 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Copilot AI assigned Copilot and baronfel Oct 16, 2025

Copilot started work on behalf of baronfel October 16, 2025 19:32 View session

Copilot AI changed the title ~~[WIP] Fix SdkResolver environment vars precedence over ambient variables~~ Make SdkResolver-provided environment variables take precedence over ambient environment Oct 16, 2025

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Known Issue: .NET 10.0.100-rc.2 can fail to launch the C# compiler when used in Visual Studio 2022 #12669

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baronfel force-pushed the copilot/fix-env-vars-precedence-issue branch from c24c943 to 5b852f6 Compare October 20, 2025 15:14

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Comment thread src/Build/BackEnd/Components/SdkResolution/SdkResult.cs

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rainersigwald approved these changes Apr 6, 2026

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baronfel force-pushed the copilot/fix-env-vars-precedence-issue branch from 79626cc to e1a79ed Compare April 20, 2026 14:55

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Fix SDK environment variable precedence to override ambient env vars

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Add null parameter validation for SDK environment variables

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Make SdkResolver-provided environment variables take precedence over ambient environment - #12655

Make SdkResolver-provided environment variables take precedence over ambient environment#12655
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