DevOps Workflow Improvements

- `VirtualBox-Wrapper.ps1` now takes 'up' or 'down' as opposed to a machine name. This allows start/stop of a virtualmachine.
- `VirtualBox-Wrapper.ps1` now relies on a gitignored `localenv.json` to work.
- `VirtualBox-Wrapper.ps1` can also optionally monitor the log file generated from the serial adapter in VirtualBox.
- `readme.md` updated to provide instructions on how to populate the `localenv.json` file.
- `tasks.json` updated to have a "Clean" task to --remove-orphans, the Build task depends on this.
- `tasks.json` updated to have a "Close VirtualBox" task, this runs the `virtualbox-wrapper.ps1` in 'down' mode. The Build task depends on this.
- `launch.json` updated to run the `VirtualBox-Wrapper.ps1` with the "-Command up" argument, instead of machine name.
- .gitignore updated to ignore any instances of `localenv.json`.

virtualbox-wrapper.ps1

@@ -1,16 +1,58 @@
+<# 
+You need a local git-ignored localenv.json file with the following content:
+{
+  "virtualbox": {
+    "MachineName": "your-machine-name or guid"
+  }
+}
+#>
+
 param (
-  $MachineName
+  [Parameter(Mandatory=$true)]
+  [ValidateSet('up', 'down')]
+  [String]$Command
 )
 
-VBoxManage.exe startvm $MachineName
+$Config = Get-Content .\localenv.json | ConvertFrom-Json
+$MachineName = $Config.virtualbox.MachineName
+$LogLocation = $Config.virtualbox.LogLocation
+$LogOutputEnabled = $LogLocation -ne $null
 
-$running=$true
-while($running) {
-  Start-Sleep -Seconds 1
-  $status=(VBoxManage.exe list runningvms)
-  if($status) {
-    $running=$status.contains($MachineName)
-  } else {
-    $running=$false
+if ($Command -eq 'up') {
+
+  if($LogOutputEnabled) {
+    Clear-Content $LogLocation
   }
+
+  $MonitorJob = Start-Job -ArgumentList $MachineName -ScriptBlock {
+    param($MachineName)
+    Write-Output "Starting $MachineName"
+    VBoxManage.exe startvm $MachineName
+    $running=$true
+    while($running) {
+      $status=(VBoxManage.exe list runningvms)
+      if($status) {
+        $running=$status.contains($MachineName)
+      } else {
+        $running=$false
+      }
+    }
+  }
+  
+  if($LogOutputEnabled) {
+    $LogJob = Start-Job -ArgumentList $LogLocation -ScriptBlock {
+      param($LogLocation)
+      Get-Content -Path $LogLocation -Wait
+    }
+  }
+
+  while($MonitorJob.State -eq 'Running') {
+    if($LogOutputEnabled) {
+      Receive-Job $LogJob
+    }
+    Receive-Job $MonitorJob
+  }
+} elseif ($Command -eq 'down') {
+  Write-Output "Stopping $MachineName"
+  VBoxManage.exe controlvm $MachineName poweroff
 }