Clean up background processes on CI builds (#11151)

Addresses issues where background Java processes causes builds to hang.
Added diagnostics to capture running processes on CI builds.

build.cmd

 @ECHO OFF
 SETLOCAL
-PowerShell -NoProfile -NoLogo -ExecutionPolicy unrestricted -Command "[System.Threading.Thread]::CurrentThread.CurrentCulture = ''; [System.Threading.Thread]::CurrentThread.CurrentUICulture = ''; try { & '%~dp0build.ps1' %*; exit $LASTEXITCODE } catch { write-host $_; exit 1 }"
+PowerShell -NoProfile -NoLogo -ExecutionPolicy Bypass -Command "[System.Threading.Thread]::CurrentThread.CurrentCulture = ''; [System.Threading.Thread]::CurrentThread.CurrentUICulture = ''; try { & '%~dp0build.ps1' %*; exit $LASTEXITCODE } catch { write-host $_; exit 1 }"
+ECHO build.cmd completed
\ No newline at end of file

build.ps1

@@ -124,6 +124,9 @@ param(
     # MSBuild for .NET Core
     [switch]$ForceCoreMsbuild,
 
+    # Diagnostics
+    [switch]$DumpProcesses, # Capture all running processes and dump them to a file.
+
     # Other lifecycle targets
     [switch]$Help, # Show help
 
@@ -243,6 +246,12 @@ $env:DOTNET_HOME = $DotNetHome
 
 # Execute
 
+if ($DumpProcesses -or $CI)
+{
+    # Dump running processes
+    Start-Job -Name DumpProcesses -FilePath $PSScriptRoot\eng\scripts\dump_process.ps1 -ArgumentList $PSScriptRoot
+}
+
 $korebuildPath = Get-KoreBuild
 
 # Project selection
@@ -372,4 +381,16 @@ finally {
     Remove-Module 'KoreBuild' -ErrorAction Ignore
     Remove-Item env:DOTNET_HOME
     Remove-Item env:KOREBUILD_KEEPGLOBALJSON
+
+    if ($DumpProcesses -or $CI)
+    {
+        Stop-Job -Name DumpProcesses
+        Remove-Job -Name DumpProcesses
+    }
+
+    if ($CI) {
+        & "$PSScriptRoot/eng/scripts/KillProcesses.ps1"
+    }
+
+    Write-Host "build.ps1 completed"
 }

eng/scripts/cibuild.cmd

 @ECHO OFF
 SET RepoRoot=%~dp0..\..
 %RepoRoot%\build.cmd -ci -all -pack -sign %*
+ECHO cibuild.cmd completed
\ No newline at end of file

eng/scripts/dump_process.ps1

+Set-Location $args[0]
+
+$timestamp = $(get-date -f MM-dd-HH-mm)
+
+while ($true) {
+    Get-Process > artifacts/log/runningProcesses.$timestamp.txt
+    Get-WmiObject Win32_Process | select name, processid, commandline > artifacts/log/runningProcessesCommandLine.$timestamp.txt
+    Start-Sleep -Seconds 300
+}
\ No newline at end of file

restore.cmd

 @ECHO OFF
 SETLOCAL
-PowerShell -NoProfile -NoLogo -ExecutionPolicy unrestricted -Command "[System.Threading.Thread]::CurrentThread.CurrentCulture = ''; [System.Threading.Thread]::CurrentThread.CurrentUICulture = '';& '%~dp0build.ps1' -all -nobuild -restore %*; exit $LASTEXITCODE"
+PowerShell -NoProfile -NoLogo -ExecutionPolicy ByPass -Command "[System.Threading.Thread]::CurrentThread.CurrentCulture = ''; [System.Threading.Thread]::CurrentThread.CurrentUICulture = '';& '%~dp0build.ps1' -all -nobuild -restore %*; exit $LASTEXITCODE"