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using System;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.System;
using Microsoft.Extensions.Logging;
using OperatingSystem = MediaBrowser.Common.System.OperatingSystem;
namespace IsoMounter
{
/// <summary>
/// The ISO manager implementation for Linux.
/// </summary>
public class LinuxIsoManager : IIsoMounter
{
private const string MountCommand = "mount";
private const string UnmountCommand = "umount";
private const string SudoCommand = "sudo";
private readonly ILogger _logger;
private readonly string _mountPointRoot;
/// <summary>
/// Initializes a new instance of the <see cref="LinuxIsoManager" /> class.
/// </summary>
/// <param name="logger">The logger.</param>
public LinuxIsoManager(ILogger logger)
{
_logger = logger;
_mountPointRoot = Path.DirectorySeparatorChar + "tmp" + Path.DirectorySeparatorChar + "Emby";
_logger.LogDebug(
"[{0}] System PATH is currently set to [{1}].",
Name,
Environment.GetEnvironmentVariable("PATH") ?? string.Empty);
_logger.LogDebug(
"[{0}] System path separator is [{1}].",
Name,
Path.PathSeparator);
_logger.LogDebug(
"[{0}] Mount point root is [{1}].",
Name,
_mountPointRoot);
}
/// <inheritdoc />
public string Name => "LinuxMount";
#pragma warning disable SA1300
#pragma warning disable SA1400
[DllImport("libc", SetLastError = true)]
static extern uint getuid();
#pragma warning restore SA1300
#pragma warning restore SA1400
/// <inheritdoc />
public bool CanMount(string path)
{
if (OperatingSystem.Id != OperatingSystemId.Linux)
{
return false;
}
_logger.LogInformation(
"[{0}] Checking we can attempt to mount [{1}], Extension = [{2}], Operating System = [{3}].",
Name,
path,
Path.GetExtension(path),
OperatingSystem.Name);
return string.Equals(Path.GetExtension(path), ".iso", StringComparison.OrdinalIgnoreCase);
}
/// <inheritdoc />
public Task<IIsoMount> Mount(string isoPath, CancellationToken cancellationToken)
{
string cmdArguments;
string cmdFilename;
string mountPoint = Path.Combine(_mountPointRoot, Guid.NewGuid().ToString());
if (string.IsNullOrEmpty(isoPath))
{
throw new ArgumentNullException(nameof(isoPath));
}
_logger.LogInformation(
"[{Name}] Attempting to mount [{Path}].",
Name,
isoPath);
_logger.LogDebug(
"[{Name}] ISO will be mounted at [{Path}].",
Name,
mountPoint);
try
{
Directory.CreateDirectory(mountPoint);
}
catch (UnauthorizedAccessException ex)
{
throw new IOException("Unable to create mount point(Permission denied) for " + isoPath, ex);
}
catch (Exception ex)
{
throw new IOException("Unable to create mount point for " + isoPath, ex);
}
if (GetUID() == 0)
{
cmdFilename = MountCommand;
cmdArguments = string.Format(
CultureInfo.InvariantCulture,
"\"{0}\" \"{1}\"",
isoPath,
mountPoint);
}
else
{
cmdFilename = SudoCommand;
cmdArguments = string.Format(
CultureInfo.InvariantCulture,
"\"{0}\" \"{1}\" \"{2}\"",
MountCommand,
isoPath,
mountPoint);
}
_logger.LogDebug(
"[{0}] Mount command [{1}], mount arguments [{2}].",
Name,
cmdFilename,
cmdArguments);
int exitcode = ExecuteCommand(cmdFilename, cmdArguments);
if (exitcode == 0)
{
_logger.LogInformation(
"[{0}] ISO mount completed successfully.",
Name);
return Task.FromResult<IIsoMount>(new LinuxMount(this, isoPath, mountPoint));
}
_logger.LogInformation(
"[{0}] ISO mount completed with errors.",
Name);
try
{
Directory.Delete(mountPoint, false);
}
catch (Exception ex)
{
_logger.LogError(ex, "[{Name}] Unhandled exception removing mount point.", Name);
throw;
}
throw new ExternalException("Mount command failed", exitcode);
}
private uint GetUID()
{
var uid = getuid();
_logger.LogDebug(
"[{0}] GetUserId() returned [{2}].",
Name,
uid);
return uid;
}
private int ExecuteCommand(string cmdFilename, string cmdArguments)
{
var startInfo = new ProcessStartInfo
{
FileName = cmdFilename,
Arguments = cmdArguments,
UseShellExecute = false,
CreateNoWindow = true,
ErrorDialog = false,
RedirectStandardOutput = true,
RedirectStandardError = true
};
var process = new Process()
{
StartInfo = startInfo
};
try
{
process.Start();
_logger.LogDebug(
"[{Name}] Standard output from process is [{Error}].",
Name,
process.StandardOutput.ReadToEnd());
_logger.LogDebug(
"[{Name}] Standard error from process is [{Error}].",
Name,
process.StandardError.ReadToEnd());
return process.ExitCode;
}
catch (Exception ex)
{
_logger.LogDebug(ex, "[{Name}] Unhandled exception executing command.", Name);
throw;
}
finally
{
process?.Dispose();
}
}
/// <summary>
/// Unmounts the specified mount.
/// </summary>
/// <param name="mount">The mount.</param>
internal void OnUnmount(LinuxMount mount)
{
if (mount == null)
{
throw new ArgumentNullException(nameof(mount));
}
_logger.LogInformation(
"[{0}] Attempting to unmount ISO [{1}] mounted on [{2}].",
Name,
mount.IsoPath,
mount.MountedPath);
string cmdArguments;
string cmdFilename;
if (GetUID() == 0)
{
cmdFilename = UnmountCommand;
cmdArguments = string.Format(
CultureInfo.InvariantCulture,
"\"{0}\"",
mount.MountedPath);
}
else
{
cmdFilename = SudoCommand;
cmdArguments = string.Format(
CultureInfo.InvariantCulture,
"\"{0}\" \"{1}\"",
UnmountCommand,
mount.MountedPath);
}
_logger.LogDebug(
"[{0}] Umount command [{1}], umount arguments [{2}].",
Name,
cmdFilename,
cmdArguments);
int exitcode = ExecuteCommand(cmdFilename, cmdArguments);
if (exitcode == 0)
{
_logger.LogInformation(
"[{0}] ISO unmount completed successfully.",
Name);
}
else
{
_logger.LogInformation(
"[{0}] ISO unmount completed with errors.",
Name);
}
try
{
Directory.Delete(mount.MountedPath, false);
}
catch (Exception ex)
{
_logger.LogError(ex, "[{Name}] Unhandled exception removing mount point.", Name);
throw;
}
throw new ExternalException("Mount command failed", exitcode);
}
}
}
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