Docker Toolbox startup helper for Windows

docker-start.ps1

# This script will hopefully make using Docker Toolbox on Windows a lot easier. 
# There's Docker for Windows, but you need to live with Docker Toolbox if you have Windows 10 Home or an older version of Windows.
#
# The script checks if your shared folders are set up correctly in VirtualBox, starts the Docker VM,
# mounts the shared folders, and sets the environment in your current shell.
#
# This script assumes you have VBoxManage.exe in your PATH.
#
# License: MIT

$Config = @{
    # Which Docker machine should this script use?
    Machine = "default";

    # Shared folders config
    SharedFolders = @(
        @{
            Name = "web";
            HostPath = "C:\web";
            GuestDirectory = "/var/www";
            ReadOnly = $False;
            AutoMount = $True;
            Permanent = $True;
        }
    );
}

function Log {
    Write-Host "[docker-start] " -ForegroundColor Yellow -NoNewline
    Write-Host $args
}

function Bailout {
    $Command = $args -join " "
    Write-Host $Command
    Invoke-Expression $Command

    if ($LastExitCode -ne 0) {
        Log "Last command returned an error code $LastExitCode. Interrupting."
        exit
    }
}

# Find out if the shared folder is already mapped to the VM
foreach ($Folder in $Config.SharedFolders) {
    $FolderPattern = 'SharedFolderNameMachineMapping\d+="'
    $FolderPattern += $Folder.Name
    $FolderPattern += '"'
    $FolderMatch = VBoxManage showvminfo $Config.Machine --machinereadable | Select-String -pattern $FolderPattern

    if ($FolderMatch -eq $Null) {
        Log Stopping machine $Config.Machine
        docker-machine stop $Config.Machine

        Log Creating shared folder $Folder.Name

        $Params = New-Object System.Collections.ArrayList
        if ($Folder.ReadOnly -eq $True) { [void] $Params.Add("--readonly") }
        if ($Folder.AutoMount -eq $True) { [void] $Params.Add("--automount") }
        if ($Folder.Permanent -eq $False) { [void] $Params.Add("--transient") }
        $OutParams = $Params -join " "

        Bailout VBoxManage sharedfolder add $Config.Machine --name $Folder.Name --hostpath $Folder.HostPath $outparams
    }
}

Log Starting the machine $Config.Machine...
Bailout docker-machine restart $Config.Machine

# Docker is sometimes complaining about certs, if it happens to you, regenerate them with this.

# Log Regenerating certs...
# Bailout docker-machine regenerate-certs --force $Config.Machine

foreach ($Folder in $Config.SharedFolders) {
    Log Adding shared folder $Folder.Name ($Folder.HostPath) to $Folder.GuestDirectory
    docker-machine ssh $Config.Machine sudo mkdir -p $Folder.GuestDirectory
    docker-machine ssh $Config.Machine sudo mount -t vboxsf -o defaults,uid=``id -u docker``,gid=``id -g docker`` $Folder.Name $Folder.GuestDirectory
}

docker-machine env | Invoke-Expression

Log Docker is ready!

$IP = docker-machine ip $Config.Machine
Log IP address: $IP

Log Environment is set in this shell. If you want to invoke Docker from anywhere else, type this command:
Log "docker-machine env | Invoke-Expression"