Add source files for coverage run (PowerShell#4925)

A number of tests require the sources to be present in order to work correctly.
During cleanup be sure to remove any lingering powershell.exe processes because subsequent runs will not be able to update the test binaries.

test/tools/CodeCoverageAutomation/Start-CodeCoverageRun.ps1

@@ -196,14 +196,60 @@ try
         $openCoverParams.Add('SuppressQuiet', $true)
     }
 
+    # grab the commitID, we need this to grab the right sources
+    $gitCommitId = & "$psBinPath\powershell.exe" -noprofile -command { $PSVersiontable.GitCommitId }
+    $commitId = $gitCommitId.substring($gitCommitId.LastIndexOf('-g') + 2)
+
+    # download the src directory
+    try
+    {
+        $gitexe = "C:\Program Files\git\bin\git.exe"
+        # operations relative to where the test location is.
+        # some tests rely on source files being available in $outputBaseFolder/test
+        Push-Location $outputBaseFolder
+        # clean up partial repo clone before starting
+        if ( Test-Path "$outputBaseFolder/.git" )
+        {
+            remove-item -force -recurse "${outputBaseFolder}/.git"
+        }
+        if ( Test-Path "$outputBaseFolder/src" )
+        {
+            remove-item -force -recurse "${outputBaseFolder}/src"
+        }
+        Write-LogPassThru -Message "initializing repo in $outputBaseFolder"
+        & $gitexe init
+        Write-LogPassThru -Message "git operation 'init' returned $LASTEXITCODE"
+
+        Write-LogPassThru -Message "adding remote"
+        & $gitexe remote add origin https://github.com/PowerShell/PowerShell
+        Write-LogPassThru -Message "git operation 'remote add' returned $LASTEXITCODE"
+
+        Write-LogPassThru -Message "setting sparse-checkout"
+        & $gitexe config core.sparsecheckout true
+        Write-LogPassThru -Message "git operation 'set sparse-checkout' returned $LASTEXITCODE"
+
+        Write-LogPassThru -Message "pulling sparse repo"
+        "src" | out-file -encoding ascii .git\info\sparse-checkout
+        & $gitexe pull origin master
+        Write-LogPassThru -Message "git operation 'pull' returned $LASTEXITCODE"
+
+        Write-LogPassThru -Message "checkout commit $commitId"
+        & $gitexe checkout $commitId
+        Write-LogPassThru -Message "git operation 'checkout' returned $LASTEXITCODE"
+    }
+    finally
+    {
+        Pop-Location
+    }
+
     $openCoverParams | Out-String | Write-LogPassThru
     Write-LogPassThru -Message "Starting test run."
 
     if(Test-Path $outputLog)
     {
         Remove-Item $outputLog -Force -ErrorAction SilentlyContinue
     }
-
+    # now invoke opencover
     Invoke-OpenCover @openCoverParams
 
     if(Test-Path $outputLog)
@@ -213,9 +259,6 @@ try
 
     Write-LogPassThru -Message "Test run done."
 
-    $gitCommitId = & "$psBinPath\powershell.exe" -noprofile -command { $PSVersiontable.GitCommitId }
-    $commitId = $gitCommitId.substring($gitCommitId.LastIndexOf('-g') + 2)
-
     Write-LogPassThru -Message $commitId
 
     $coverallsPath = "$outputBaseFolder\coveralls"
@@ -242,17 +285,29 @@ try
     & $coverallsExe """$coverallsParams"""
 
     Write-LogPassThru -Message "Uploading to CodeCov"
-    ConvertTo-CodeCovJson -Path $outputLog -DestinationPath $jsonFile
-    Push-CodeCovData -file $jsonFile -CommitID $commitId -token $codecovToken -Branch 'master'
+    if ( test-path $outputLog ) {
+        ConvertTo-CodeCovJson -Path $outputLog -DestinationPath $jsonFile
+        Push-CodeCovData -file $jsonFile -CommitID $commitId -token $codecovToken -Branch 'master'
 
-    Write-LogPassThru -Message "Upload complete."
+        Write-LogPassThru -Message "Upload complete."
+    }
+    else {
+        Write-LogPassThru -Message "ERROR: Could not find $outputLog - no upload"
+    }
 }
 catch
 {
     Write-LogPassThru -Message $_
 }
 finally
 {
+    # the powershell execution should be done, be sure that there are no PowerShell test executables running because
+    # they will cause subsequent coverage runs to behave poorly. Make sure that the path is properly formatted, and
+    # we need to use like rather than match because on Windows, there will be "\" as path separators which would need 
+    # escaping for -match
+    $ResolvedPSBinPath = (Resolve-Path ${psbinpath}).Path
+    Get-Process PowerShell | Where-Object { $_.Path -like "*${ResolvedPSBinPath}*" } | Stop-Process -Force -ErrorAction Continue
+
     ## See if Azure log directory is mounted
     if(Test-Path $azureLogDrive)
     {
@@ -268,6 +323,8 @@ finally
         Remove-Item -Path $destinationPath -Force -ErrorAction SilentlyContinue
     }
 
+    Write-LogPassThru -Message "**** COMPLETE ****"
+
     ## Disable the cleanup till we stabilize.
     #Remove-Item -recurse -force -path $outputBaseFolder
     $ErrorActionPreference = $oldErrorActionPreference