Fixed issue 3729

The logic used to read the file contents sometimes would leave lines behind unread. It now defaults to reading all lines and counts each line it has actually read.

plugins/communicators/winrm/scripts/elevated_shell.ps1.erb

@@ -71,25 +71,23 @@ while ( (!($registered_task.state -eq 4)) -and ($sec -lt $timeout) ) {
   $sec++
 }
 
-# Read the entire file, but only write out new lines we haven't seen before
-$numLinesRead = 0
-do {
-  Start-Sleep -m 100
-  
+function SlurpOutput($out_file, $cur_line) {
   if (Test-Path $out_file) {
-    $text = (get-content $out_file)
-    $numLines = ($text | Measure-Object -line).lines    
-    $numLinesToRead = $numLines - $numLinesRead
-    
-    if ($numLinesToRead -gt 0) {
-      $text | select -first $numLinesToRead -skip $numLinesRead | ForEach {
-        Write-Host "$_"
-      }
-      $numLinesRead += $numLinesToRead
+    get-content $out_file | select -skip $cur_line | ForEach {
+      $cur_line += 1
+      Write-Host "$_" 
     }
   }
+  return $cur_line
+}
+
+$cur_line = 0
+do {
+  Start-Sleep -m 100
+  $cur_line = SlurpOutput $out_file $cur_line
 } while (!($registered_task.state -eq 3))
 
 $exit_code = $registered_task.LastTaskResult
 [System.Runtime.Interopservices.Marshal]::ReleaseComObject($schedule) | Out-Null
+
 exit $exit_code