support/install_command.ps1 in mixlib-install-1.0.11 vs support/install_command.ps1 in mixlib-install-1.0.12

@@ -41,14 +41,23 @@
   else { throw "SHA256 for $dst $dsha256 does not match $sha256" }
 }
 
 Function Install-Chef($msi) {
   Log "Installing Chef Omnibus package $msi"
-  $p = Start-Process -FilePath "msiexec.exe" -ArgumentList "/qn /i $msi" -Passthru -Wait
-  $p.WaitForExit()
-
-  if ($p.ExitCode -ne 0) { throw "msiexec was not successful. Received exit code $($p.ExitCode)" }
-
+  $installingChef = $True
+  $installAttempts = 0
+  while ($installingChef) {
+    $installAttempts++
+    $p = Start-Process -FilePath "msiexec.exe" -ArgumentList "/qn /i $msi" -Passthru -Wait
+    $p.WaitForExit()
+    if ($p.ExitCode -eq 1618) {
+      Log "Another msi install is in progress (exit code 1618), retrying ($($installAttempts))..."
+      continue
+    } elseif ($p.ExitCode -ne 0) {
+      throw "msiexec was not successful. Received exit code $($p.ExitCode)"
+    }
+    $installingChef = $False
+  }
   Remove-Item $msi -Force
   Log "Installation complete"
 }
 
 Function Log($m) { Write-Host "       $m`n" }