fixed git checkout script

scripts/common.ps1

@@ -43,7 +43,7 @@ function Invoke-Call {
         [scriptblock]$ScriptBlock,
         [string]$ErrorAction = $ErrorActionPreference
     )
-    & @ScriptBlock 2>&1 | %{ "$_" }
+    & @ScriptBlock 2>&1 3>&1 4>&1| ForEach-Object { "$_" }
     if (($lastexitcode -ne 0) -and $ErrorAction -eq "Stop") {
         Write-Error "Command $ScriptBlock exited with $lastexitcode."
         exit $lastexitcode

scripts/git_checkout.ps1

@@ -14,25 +14,26 @@
 
 . ${PSScriptRoot}\common.ps1
 
-Set-PSDebug -Trace 1
+#Set-PSDebug -Trace 1
 
 # Wrap git commant in error handling function
-function Invoke-Git
-{
-    param (
-        [scriptblock]$args
-    )
-    Invoke-Call -ScriptBlock { git $args } -ErrorAction Stop
+function Invoke-Git($cmd) {
+    Invoke-Call -ScriptBlock { git @cmd } -ErrorAction Stop
 }
 
 if (Test-Path -PathType Container "llvm-project"){
     Set-Location llvm-project
     Write-Output "performing git pull..."
-    Invoke-Git checkout master
-    Invoke-Git reset
-    Invoke-Git clean -fdx
-    Invoke-Git pull
+    $branch = (git branch) | Out-String
+    $branch = ($branch -split '\r')[0]
+    if ($branch -ne "* master"){
+        Invoke-Call -ScriptBlock { git checkout master} -ErrorAction Stop
+    }
+    Invoke-Call -ScriptBlock { git reset --hard } -ErrorAction Stop
+    Invoke-Call -ScriptBlock { git clean -fdx } -ErrorAction Stop
+    Invoke-Call -ScriptBlock { git pull } -ErrorAction Stop
     # TODO: in case of errors: delete folder and clone
 } else {
     Write-Output "performing git clone..."
-    Invoke-Git clone -q --depth 1 https://github.com/llvm/llvm-project
+    Invoke-Call -ScriptBlock { git clone -q --depth 1 https://github.com/llvm/llvm-project } -ErrorAction Stop
+}