powershell - Psake and robocopy failing -

robocopy exit code above 0 , still possibly not failure. psake detects above 0 failure , fails build. fine, how come still fails:

task deploy {             robocopy $source $dest /np /s /xo /nfl /ndl /njh /njs | out-default      if ($lastexitcode -eq 3)     {        write-host "got here"        $lastexitcode = 0            }      write-host "deploy local complete"     write-host $lastexitcode }  taskteardown {       if ($lastexitcode -ne 0) {         write-host "build failed"         exit 1     } } 

i can verify deploy if statement hit , write-host outputs 0, correctly, yet taskteardown still detects last exit code 3! how fix this?

robocopy exit codes below 8 non-error status codes. exit codes of 8 , above indicate error. see here.

the reason why teardown task still reports exit code of 3 because automatic variable $lastexitcode global variable, whereas deploy task creates additional local variable $lastexitcode masks global variable in scope of task. suggested in this answer similar question, use $global: prefix:

$global:lastexitcode = $null