/// <summary>
/// Waits for any Zero Install instances running in <see cref="TargetDir"/> to terminate and then prevents new ones from starting.
/// </summary>
/// <remarks>The <see cref="TargetDir"/> is encoded into an <see cref="AppMutex"/> name using <see cref="object.GetHashCode"/>.</remarks>
private void MutexAcquire()
{
if (FileUtils.PathEquals(TargetDir, Locations.InstallBase))
{
Log.Info("Cannot use Mutex because source and target directory are the same: " + TargetDir);
return;
}
if (ZeroInstallEnvironment.MutexName(TargetDir) == ZeroInstallEnvironment.MutexName(Locations.InstallBase))
{
Log.Warn($"Hash collision between {TargetDir} and {Locations.InstallBase}! Not using Mutex.");
return;
}
Handler.RunTask(new SimpleTask(Resources.MutexWait, () =>
{
// Wait for existing instances to terminate
while (AppMutex.Probe(ZeroInstallEnvironment.MutexName(TargetDir)) || AppMutex.Probe(ZeroInstallEnvironment.LegacyMutexName(TargetDir)))
{
Thread.Sleep(1000);
Handler.CancellationToken.ThrowIfCancellationRequested();
}
// Prevent new instances from starting during the update
_updateMutex = AppMutex.Create(ZeroInstallEnvironment.UpdateMutexName(TargetDir));
_legacyUpdateMutex = AppMutex.Create(ZeroInstallEnvironment.LegacyUpdateMutexName(TargetDir));
// Detect any new instances that started in the short time between detecting existing ones and blocking new ones
while (AppMutex.Probe(ZeroInstallEnvironment.MutexName(TargetDir)) || AppMutex.Probe(ZeroInstallEnvironment.LegacyMutexName(TargetDir)))
{
Thread.Sleep(1000);
Handler.CancellationToken.ThrowIfCancellationRequested();
}
}));
}
public ZeroInstallLauncher(string commandLine)
: base(ProcessUtils.FromCommandLine(commandLine))
{
string?installBase = Path.GetDirectoryName(FileName);
_mutexName = ZeroInstallEnvironment.MutexName(installBase);
_updateMutexName = ZeroInstallEnvironment.UpdateMutexName(installBase);
_legacyMutexName = ZeroInstallEnvironment.LegacyMutexName(installBase);
_legacyUpdateMutexName = ZeroInstallEnvironment.LegacyUpdateMutexName(installBase);
}
/// <summary>
/// Common initialization code to be called by every Zero Install executable right after startup.
/// </summary>
public static void Init()
{
AppMutex.Create(ZeroInstallEnvironment.MutexName());
AppMutex.Create(ZeroInstallEnvironment.LegacyMutexName());
if (AppMutex.Probe(ZeroInstallEnvironment.UpdateMutexName()) || AppMutex.Probe(ZeroInstallEnvironment.LegacyUpdateMutexName()))
{
Environment.Exit(999);
}
if (UILanguage != null)
{
Languages.SetUI(UILanguage);
}
ProcessUtils.SanitizeEnvironmentVariables();
NetUtils.ApplyProxy();
ServicePointManager.DefaultConnectionLimit = 16;
}
