Merge pull request chocolatey#2756 from corbob/update-refreshenv

(chocolatey#1392) Update refreshenv to detect when not in cmd shell

src/chocolatey.resources/redirects/RefreshEnv.cmd

@@ -1,3 +1,66 @@
+:: Code generously provided by @beatcracker: https://github.com/beatcracker/detect-batch-subshell
+@echo off
+
+setlocal EnableDelayedExpansion
+
+:: Dequote path to command processor and this script path
+set ScriptPath=%~0
+set CmdPath=%COMSPEC:"=%
+
+:: Get command processor filename and filename with extension
+for %%c in (!CmdPath!) do (
+    set CmdExeName=%%~nxc
+    set CmdName=%%~nc
+)
+
+:: Get this process' PID
+:: Adapted from: http://www.dostips.com/forum/viewtopic.php?p=22675#p22675
+set "uid="
+for /l %%i in (1 1 128) do (
+    set /a "bit=!random!&1"
+    set "uid=!uid!!bit!"
+)
+
+for /f "tokens=2 delims==" %%i in (
+    'wmic Process WHERE "Name='!CmdExeName!' AND CommandLine LIKE '%%!uid!%%'" GET ParentProcessID /value'
+) do (
+    rem Get commandline of parent
+    for /f "tokens=1,2,*" %%j in (
+        'wmic Process WHERE "Handle='%%i'" GET CommandLine /value'
+    ) do (
+
+        rem Strip extra CR's from wmic output
+        rem http://www.dostips.com/forum/viewtopic.php?t=4266
+        for /f "delims=" %%x in ("%%l") do (
+            rem Dequote path to batch file, if any (3rd argument)
+            set ParentScriptPath=%%x
+            set ParentScriptPath=!ParentScriptPath:"=!
+        )
+
+        rem Get parent process path
+        for /f "tokens=2 delims==" %%y in ("%%j") do (
+            rem Dequote parent path
+            set ParentPath=%%y
+            set ParentPath=!ParentPath:"=!
+
+            rem Handle different invocations: C:\Windows\system32\cmd.exe , cmd.exe , cmd
+            for %%p in (!CmdPath! !CmdExeName! !CmdName!) do (
+                if !ParentPath!==%%p set IsCmdParent=1
+            )
+
+            rem Check if we're running in cmd.exe with /c switch and this script path as argument
+            if !IsCmdParent!==1 if %%k==/c if "!ParentScriptPath!"=="%ScriptPath%" set IsExternal=1
+        )
+    )
+)
+
+if !IsExternal!==1 (
+    echo %~nx0 does not work when run from this process. If you're in PowerShell, please 'Import-Module $env:ChocolateyInstall\helpers\chocolateyProfile.psm1' and try again.
+    exit 1
+)
+
+endlocal
+:: End code from @beatcracker
 @echo off
 ::
 :: RefreshEnv.cmd