Sync eng/common directory with azure-sdk-tools for PR 974

eng/common/scripts/common.ps1

@@ -8,6 +8,7 @@ $EngScriptsDir = Join-Path $EngDir "scripts"
 . (Join-Path $EngCommonScriptsDir SemVer.ps1)
 . (Join-Path $EngCommonScriptsDir ChangeLog-Operations.ps1)
 . (Join-Path $EngCommonScriptsDir Package-Properties.ps1)
+. (Join-Path $EngCommonScriptsDir logging.ps1)
 
 # Setting expected from common languages settings
 $Language = "Unknown"
@@ -20,7 +21,7 @@ $EngScriptsLanguageSettings = Join-path $EngScriptsDir "Language-Settings.ps1"
 if (Test-Path $EngScriptsLanguageSettings) {
   . $EngScriptsLanguageSettings
 }
-If ($LanguageShort -eq $null)
+if (-not $LanguageShort)
 {
   $LangaugeShort = $Language
 }

eng/common/scripts/logging.ps1

@@ -0,0 +1,40 @@
+if (-not $isDevOpsRun)
+{
+  $isDevOpsRun = ($null -ne $env:SYSTEM_TEAMPROJECTID)
+}
+
+function LogWarning
+{
+    if ($isDevOpsRun) 
+    {
+        Write-Host "##vso[task.LogIssue type=warning;]$args"
+    }
+    else
+    {
+        Write-Warning "$args"
+    }
+}
+
+function LogError
+{
+    if ($isDevOpsRun) 
+    {
+        Write-Host "##vso[task.LogIssue type=error;]$args"
+    }
+    else 
+    {
+        Write-Error "$args"
+    }
+}
+
+function LogDebug
+{
+    if ($isDevOpsRun) 
+    {
+        Write-Host "##vso[task.LogIssue type=debug;]$args"
+    }
+    else 
+    {
+        Write-Debug "$args"
+    }
+}