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main.c

/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
 *
 * Copyright (C) 2007 David Zeuthen <david@fubar.dk>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pwd.h>
#include <grp.h>

#include <glib.h>
#include <glib/gi18n-lib.h>
#include <glib-object.h>

#include <dbus/dbus-glib.h>
#include <dbus/dbus-glib-lowlevel.h>

#include "poller.h"
#include "daemon.h"

#include "profile.h"

#define NAME_TO_CLAIM "org.freedesktop.UDisks"

static GMainLoop *loop;

static void
name_lost (DBusGProxy *system_bus_proxy,
           const char *name_which_was_lost,
           gpointer user_data)
{
  g_warning ("got NameLost, exiting");
  g_main_loop_quit (loop);
}

static gboolean
acquire_name_on_proxy (DBusGProxy *system_bus_proxy,
                       gboolean replace)
{
  GError *error;
  guint result;
  gboolean res;
  gboolean ret;
  guint flags;

  ret = FALSE;

  flags = DBUS_NAME_FLAG_ALLOW_REPLACEMENT;
  if (replace)
    flags |= DBUS_NAME_FLAG_REPLACE_EXISTING;

  if (system_bus_proxy == NULL)
    {
      goto out;
    }

  error = NULL;
  res = dbus_g_proxy_call (system_bus_proxy,
                           "RequestName",
                           &error,
                           G_TYPE_STRING,
                           NAME_TO_CLAIM,
                           G_TYPE_UINT,
                           flags,
                           G_TYPE_INVALID,
                           G_TYPE_UINT,
                           &result,
                           G_TYPE_INVALID);
  if (!res)
    {
      if (error != NULL)
        {
          g_warning ("Failed to acquire %s: %s", NAME_TO_CLAIM, error->message);
          g_error_free (error);
        }
      else
        {
          g_warning ("Failed to acquire %s", NAME_TO_CLAIM);
        }
      goto out;
    }

  if (result != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER)
    {
      if (error != NULL)
        {
          g_warning ("Failed to acquire %s: %s", NAME_TO_CLAIM, error->message);
          g_error_free (error);
        }
      else
        {
          g_warning ("Failed to acquire %s", NAME_TO_CLAIM);
        }
      goto out;
    }

  dbus_g_proxy_add_signal (system_bus_proxy, "NameLost", G_TYPE_STRING, G_TYPE_INVALID);
  dbus_g_proxy_connect_signal (system_bus_proxy, "NameLost", G_CALLBACK (name_lost), NULL, NULL);

  ret = TRUE;

 out:
  return ret;
}

int
main (int argc,
      char **argv)
{
  GError *error;
  Daemon *daemon;
  GOptionContext *context;
  DBusGProxy *system_bus_proxy;
  DBusGConnection *bus;
  static char *helper_dir = NULL;
  char *path;
  int ret;
  static gboolean replace;
  static GOptionEntry entries[] =
    {
      { "replace", 0, 0, G_OPTION_ARG_NONE, &replace, "Replace existing daemon", NULL },
      { "helper-dir", 0, G_OPTION_FLAG_FILENAME, G_OPTION_ARG_STRING,
        &helper_dir, "Directory for helper tools",  NULL },
      { NULL } };

  PROFILE ("main(): start");

  ret = 1;
  error = NULL;

  g_type_init ();

  /* fork the polling process early */
  if (!poller_setup (argc, argv))
    {
      goto out;
    }

  /* avoid gvfs (http://bugzilla.gnome.org/show_bug.cgi?id=526454) */
  if (!g_setenv ("GIO_USE_VFS", "local", TRUE))
    {
      g_warning ("Couldn't set GIO_USE_GVFS");
      goto out;
    }

  context = g_option_context_new ("udisks storage daemon");
  g_option_context_add_main_entries (context, entries, NULL);
  g_option_context_parse (context, &argc, &argv, NULL);
  g_option_context_free (context);

  /* run with a controlled path */
  if (helper_dir != NULL)
      path = g_strdup_printf ("%s:" PACKAGE_LIBEXEC_DIR ":/sbin:/bin:/usr/sbin:/usr/bin", helper_dir);
  else
      path = g_strdup (PACKAGE_LIBEXEC_DIR ":/sbin:/bin:/usr/sbin:/usr/bin");

  if (!g_setenv ("PATH", path, TRUE))
    {
      g_warning ("Couldn't set PATH");
      goto out;
    }
  g_free (path);

  PROFILE ("main(): basic initialization done");

  bus = dbus_g_bus_get (DBUS_BUS_SYSTEM, &error);
  if (bus == NULL)
    {
      g_warning ("Couldn't connect to system bus: %s", error->message);
      g_error_free (error);
      goto out;
    }

  system_bus_proxy = dbus_g_proxy_new_for_name (bus, DBUS_SERVICE_DBUS, DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS);
  if (system_bus_proxy == NULL)
    {
      g_warning ("Could not construct system_bus_proxy object; bailing out");
      goto out;
    }

  if (!acquire_name_on_proxy (system_bus_proxy, replace))
    {
      g_warning ("Could not acquire name; bailing out");
      goto out;
    }

  PROFILE ("main(): D-Bus initialization done");

  g_debug ("Starting daemon version %s", VERSION);

  daemon = daemon_new ();

  if (daemon == NULL)
    {
      goto out;
    }

  PROFILE ("main(): starting main loop");
  loop = g_main_loop_new (NULL, FALSE);

  g_main_loop_run (loop);

  g_object_unref (daemon);
  g_main_loop_unref (loop);
  ret = 0;

 out:
  return ret;
}

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