singrdk/base/Services/Fat/Control/UnmountCommand.sg

///////////////////////////////////////////////////////////////////////////////
//
//  Microsoft Research Singularity
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  File:   UnmountCommand.sg
//
//  Note:
//

using System;

using Microsoft.SingSharp;
using Microsoft.SingSharp.Reflection;

using Microsoft.Singularity.Applications;
using Microsoft.Singularity.Channels;
using Microsoft.Singularity.Configuration;
using Microsoft.Singularity.Directory;
using Microsoft.Singularity.Io;

using Microsoft.Singularity.Services.Fat.Contracts;

namespace Microsoft.Singularity.Services.Fat.FatControl
{
    [ConsoleCategory(Action = "unmount",
                     DefaultAction = false,
                     HelpMessage = "Unmount a FAT filesystem.")]
    internal class UnmountCommand
    {
        [InputEndpoint("data")]
        public readonly TRef<UnicodePipeContract.Imp:READY> Stdin;

        [OutputEndpoint("data")]
        public readonly TRef<UnicodePipeContract.Imp:READY> Stdout;

        [BoolParameter("f", Default = false, Mandatory = false,
                       HelpMessage = "Force unmount if filesystem is in use.")]
        bool Force;

        [StringParameter("mountpath", Position = 0, Mandatory = true,
                         HelpMessage = "Filesystem to unmount.")]
        string MountPath;

        reflective internal UnmountCommand();

        internal int AppMain()
        {
            int status = -1;

            FatControlContract.Imp imp = Utilities.ConnectToManager();
            if (imp != null) {
                try {
                    status = Unmount(imp);
                }
                finally {
                    delete imp;
                }
            }
            return status;
        }

        private int Unmount(FatControlContract.Imp! imp)
        {
            int status = -1;

            imp.SendUnmount(Bitter.FromString2((!)this.MountPath), this.Force);
            switch receive {
                case imp.Success():
                    status = 0;
                    break;

                case imp.Fail(error):
                    Utilities.DisplayError(error);
                    break;

                case imp.ChannelClosed():
                    Utilities.DisplayChannelClosedError();
                    break;
            }
            return status;
        }
    }
}