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nautilus-main.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: 8; c-basic-offset: 8 -*- */

/*
 * Nautilus
 *
 * Copyright (C) 1999, 2000 Red Hat, Inc.
 * Copyright (C) 1999, 2000 Eazel, Inc.
 *
 * Nautilus 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.
 *
 * Nautilus 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Authors: Elliot Lee <sopwith@redhat.com>,
 *          Darin Adler <darin@bentspoon.com>,
 *          John Sullivan <sullivan@eazel.com>
 *
 */

/* nautilus-main.c: Implementation of the routines that drive program lifecycle and main window creation/destruction. */

#include <config.h>
#include "nautilus-main.h"

#include "nautilus-application.h"
#include "nautilus-self-check-functions.h"
#include "nautilus-window.h"
#include <dlfcn.h>
#include <signal.h>
#include <eel/eel-debug.h>
#include <eel/eel-glib-extensions.h>
#include <eel/eel-self-checks.h>
#include <libegg/eggsmclient.h>
#include <libegg/eggdesktopfile.h>
#include <gdk/gdkx.h>
#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include <gio/gdesktopappinfo.h>
#include <libnautilus-private/nautilus-debug-log.h>
#include <libnautilus-private/nautilus-directory-metafile.h>
#include <libnautilus-private/nautilus-global-preferences.h>
#include <libnautilus-private/nautilus-lib-self-check-functions.h>
#include <libnautilus-private/nautilus-icon-names.h>
#include <libxml/parser.h>
#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#ifdef HAVE_EXEMPI
#include <exempi/xmp.h>
#endif

/* Keeps track of everyone who wants the main event loop kept active */
static GSList *event_loop_registrants;

static gboolean
is_event_loop_needed (void)
{
      return event_loop_registrants != NULL;
}

static int
quit_if_in_main_loop (gpointer callback_data)
{
      guint level;

      g_assert (callback_data == NULL);

      level = gtk_main_level ();

      /* We can be called even outside the main loop,
       * so check that we are in a loop before calling quit.
       */
      if (level != 0) {
            gtk_main_quit ();
      }

      /* We need to be called again if we quit a nested loop. */
      return level > 1;
}

static void
eel_gtk_main_quit_all (void)
{
      /* Calling gtk_main_quit directly only kills the current/top event loop.
       * This idler will be run by the current event loop, killing it, and then
       * by the next event loop, ...
       */
      g_idle_add (quit_if_in_main_loop, NULL);
}

static void
event_loop_unregister (GtkObject *object)
{
      event_loop_registrants = g_slist_remove (event_loop_registrants, object);
      if (!is_event_loop_needed ()) {
            eel_gtk_main_quit_all ();
      }
}

void
nautilus_main_event_loop_register (GtkObject *object)
{
      g_signal_connect (object, "destroy", G_CALLBACK (event_loop_unregister), NULL);
      event_loop_registrants = g_slist_prepend (event_loop_registrants, object);
}

gboolean
nautilus_main_is_event_loop_mainstay (GtkObject *object)
{
      return g_slist_length (event_loop_registrants) == 1
            && event_loop_registrants->data == object;
}

void
nautilus_main_event_loop_quit (gboolean explicit)
{
      if (explicit) {
            /* Explicit --quit, make sure we don't restart */
            /* TODO: With the old session we needed to set restart
               style to GNOME_RESTART_IF_RUNNING here, but i don't think we need
               that now since gnome-session doesn't restart apps except on startup. */
      }
      while (event_loop_registrants != NULL) {
            gtk_object_destroy (event_loop_registrants->data);
      }
}

static void
dump_debug_log (void)
{
      char *filename;

      filename = g_build_filename (g_get_home_dir (), "nautilus-debug-log.txt", NULL);
      nautilus_debug_log_dump (filename, NULL); /* NULL GError */
      g_free (filename);
}

static int debug_log_pipes[2];

static gboolean
debug_log_io_cb (GIOChannel *io, GIOCondition condition, gpointer data)
{
      char a;

      while (read (debug_log_pipes[0], &a, 1) != 1)
            ;

      nautilus_debug_log (TRUE, NAUTILUS_DEBUG_LOG_DOMAIN_USER,
                      "user requested dump of debug log");

      dump_debug_log ();
      return FALSE;
}

static void
sigusr1_handler (int sig)
{
      while (write (debug_log_pipes[1], "a", 1) != 1)
            ;
}

/* This is totally broken as we're using non-signal safe
 * calls in sigfatal_handler. Disable by default. */
#ifdef USE_SEGV_HANDLER

/* sigaction structures for the old handlers of these signals */
static struct sigaction old_segv_sa;
static struct sigaction old_abrt_sa;
static struct sigaction old_trap_sa;
static struct sigaction old_fpe_sa;
static struct sigaction old_bus_sa;

static void
sigfatal_handler (int sig)
{
      void (* func) (int);

      /* FIXME: is this totally busted?  We do malloc() inside these functions,
       * and yet we are inside a signal handler...
       */
      nautilus_debug_log (TRUE, NAUTILUS_DEBUG_LOG_DOMAIN_USER,
                      "debug log dumped due to signal %d", sig);
      dump_debug_log ();

      switch (sig) {
      case SIGSEGV:
            func = old_segv_sa.sa_handler;
            break;

      case SIGABRT:
            func = old_abrt_sa.sa_handler;
            break;

      case SIGTRAP:
            func = old_trap_sa.sa_handler;
            break;

      case SIGFPE:
            func = old_fpe_sa.sa_handler;
            break;

      case SIGBUS:
            func = old_bus_sa.sa_handler;
            break;

      default:
            func = NULL;
            break;
      }

      /* this scares me */
      if (func != NULL && func != SIG_IGN && func != SIG_DFL)
            (* func) (sig);
}
#endif

static void
setup_debug_log_signals (void)
{
      struct sigaction sa;
      GIOChannel *io;

      if (pipe (debug_log_pipes) == -1)
            g_error ("Could not create pipe() for debug log");

      io = g_io_channel_unix_new (debug_log_pipes[0]);
      g_io_add_watch (io, G_IO_IN, debug_log_io_cb, NULL);

      sa.sa_handler = sigusr1_handler;
      sigemptyset (&sa.sa_mask);
      sa.sa_flags = 0;
      sigaction (SIGUSR1, &sa, NULL);

      /* This is totally broken as we're using non-signal safe
       * calls in sigfatal_handler. Disable by default. */
#ifdef USE_SEGV_HANDLER
      sa.sa_handler = sigfatal_handler;
      sigemptyset (&sa.sa_mask);
      sa.sa_flags = 0;

      sigaction(SIGSEGV, &sa, &old_segv_sa);
      sigaction(SIGABRT, &sa, &old_abrt_sa);
      sigaction(SIGTRAP, &sa, &old_trap_sa);
      sigaction(SIGFPE,  &sa, &old_fpe_sa);
      sigaction(SIGBUS,  &sa, &old_bus_sa);
#endif
}

static GLogFunc default_log_handler;

static void
log_override_cb (const gchar   *log_domain,
             GLogLevelFlags log_level,
             const gchar   *message,
             gpointer       user_data)
{
      gboolean is_debug;
      gboolean is_milestone;

      is_debug = ((log_level & G_LOG_LEVEL_DEBUG) != 0);
      is_milestone = !is_debug;

      nautilus_debug_log (is_milestone, NAUTILUS_DEBUG_LOG_DOMAIN_GLOG, "%s", message);

      if (!is_debug)
            (* default_log_handler) (log_domain, log_level, message, user_data);
}

static void
setup_debug_log_glog (void)
{
      default_log_handler = g_log_set_default_handler (log_override_cb, NULL);
}

static void
setup_debug_log (void)
{
      char *config_filename;

      config_filename = g_build_filename (g_get_home_dir (), "nautilus-debug-log.conf", NULL);
      nautilus_debug_log_load_configuration (config_filename, NULL); /* NULL GError */
      g_free (config_filename);

      setup_debug_log_signals ();
      setup_debug_log_glog ();
}

int
main (int argc, char *argv[])
{
      gboolean kill_shell;
      gboolean no_default_window;
      gboolean browser_window;
      gboolean no_desktop;
      gboolean version;
      gboolean autostart_mode;
      const char *autostart_id;
      gchar *geometry;
      const gchar **remaining;
      gboolean perform_self_check;
      NautilusApplication *application;
      GOptionContext *context;
      GFile *file;
      char *uri;
      char **uris;
      GPtrArray *uris_array;
      GError *error;
      int i;
      
      const GOptionEntry options[] = {
#ifndef NAUTILUS_OMIT_SELF_CHECK
            { "check", 'c', 0, G_OPTION_ARG_NONE, &perform_self_check, 
              N_("Perform a quick set of self-check tests."), NULL },
#endif
            { "version", '\0', 0, G_OPTION_ARG_NONE, &version,
              N_("Show the version of the program."), NULL },
            { "geometry", 'g', 0, G_OPTION_ARG_STRING, &geometry,
              N_("Create the initial window with the given geometry."), N_("GEOMETRY") },
            { "no-default-window", 'n', 0, G_OPTION_ARG_NONE, &no_default_window,
              N_("Only create windows for explicitly specified URIs."), NULL },
            { "no-desktop", '\0', 0, G_OPTION_ARG_NONE, &no_desktop,
              N_("Do not manage the desktop (ignore the preference set in the preferences dialog)."), NULL },
            { "browser", '\0', 0, G_OPTION_ARG_NONE, &browser_window, 
              N_("open a browser window."), NULL },
            { "quit", 'q', 0, G_OPTION_ARG_NONE, &kill_shell, 
              N_("Quit Nautilus."), NULL },
            { G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_STRING_ARRAY, &remaining, NULL,  N_("[URI...]") },

            { NULL }
      };

      g_thread_init (NULL);

      /* This will be done by gtk+ later, but for now, force it to GNOME */
      g_desktop_app_info_set_desktop_env ("GNOME");

      if (g_getenv ("NAUTILUS_DEBUG") != NULL) {
            eel_make_warnings_and_criticals_stop_in_debugger ();
      }
      
      /* Initialize gettext support */
      bindtextdomain (GETTEXT_PACKAGE, GNOMELOCALEDIR);
      bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
      textdomain (GETTEXT_PACKAGE);

      autostart_mode = FALSE;

      autostart_id = g_getenv ("DESKTOP_AUTOSTART_ID");
      if (autostart_id != NULL && *autostart_id != '\0') {
            autostart_mode = TRUE;
        }

      /* Get parameters. */
      remaining = NULL;
      geometry = NULL;
      version = FALSE;
      kill_shell = FALSE;
      no_default_window = FALSE;
      no_desktop = FALSE;
      perform_self_check = FALSE;
      browser_window = FALSE;

      g_set_prgname ("nautilus");
      if (g_file_test (DATADIR "/applications/nautilus.desktop", G_FILE_TEST_EXISTS)) {
            egg_set_desktop_file (DATADIR "/applications/nautilus.desktop");
      }

      context = g_option_context_new (_("\n\nBrowse the file system with the file manager"));
      g_option_context_add_main_entries (context, options, NULL);
      
      g_option_context_add_group (context, gtk_get_option_group (TRUE));
      g_option_context_add_group (context, egg_sm_client_get_option_group ());
      
      error = NULL;
      if (!g_option_context_parse (context, &argc, &argv, &error)) {
            g_printerr ("Could not parse arguments: %s\n", error->message);
            g_error_free (error);
            return 1;
      }

      g_option_context_free (context);

      if (version) {
            g_print ("GNOME nautilus " PACKAGE_VERSION "\n");
            return 0;
      }
      
#ifdef HAVE_EXEMPI
      xmp_init();
#endif

      setup_debug_log ();

      /* If in autostart mode (aka started by gnome-session), we need to ensure 
         * nautilus starts with the correct options.
         */
      if (autostart_mode) {
            no_default_window = TRUE;
            no_desktop = FALSE;
      }

      if (perform_self_check && remaining != NULL) {
            /* translators: %s is an option (e.g. --check) */
            fprintf (stderr, _("nautilus: %s cannot be used with URIs.\n"),
                  "--check");
            return EXIT_FAILURE;
      }
      if (perform_self_check && kill_shell) {
            fprintf (stderr, _("nautilus: --check cannot be used with other options.\n"));
            return EXIT_FAILURE;
      }
      if (kill_shell && remaining != NULL) {
            fprintf (stderr, _("nautilus: %s cannot be used with URIs.\n"),
                  "--quit");
            return EXIT_FAILURE;
      }
      if (geometry != NULL && remaining != NULL && remaining[0] != NULL && remaining[1] != NULL) {
            fprintf (stderr, _("nautilus: --geometry cannot be used with more than one URI.\n"));
            return EXIT_FAILURE;
      }

      /* Initialize the services that we use. */
      LIBXML_TEST_VERSION

      /* Initialize preferences. This is needed so that proper 
       * defaults are available before any preference peeking 
       * happens.
       */
      nautilus_global_preferences_init ();
      if (no_desktop) {
            eel_preferences_set_is_invisible
                  (NAUTILUS_PREFERENCES_SHOW_DESKTOP, TRUE);
            eel_preferences_set_is_invisible
                  (NAUTILUS_PREFERENCES_DESKTOP_IS_HOME_DIR, TRUE);
      }

      application = NULL;

      /* Do either the self-check or the real work. */
      if (perform_self_check) {
#ifndef NAUTILUS_OMIT_SELF_CHECK
            /* Run the checks (each twice) for nautilus and libnautilus-private. */

            nautilus_run_self_checks ();
            nautilus_run_lib_self_checks ();
            eel_exit_if_self_checks_failed ();

            nautilus_run_self_checks ();
            nautilus_run_lib_self_checks ();
            eel_exit_if_self_checks_failed ();
#endif
      } else {
            /* Convert args to URIs */
            uris = NULL;
            if (remaining != NULL) {
                  uris_array = g_ptr_array_new ();
                  for (i = 0; remaining[i] != NULL; i++) {
                        file = g_file_new_for_commandline_arg (remaining[i]);
                        if (file != NULL) {
                              uri = g_file_get_uri (file);
                              g_object_unref (file);
                              if (uri) {
                                    g_ptr_array_add (uris_array, uri);
                              }
                        }
                  }
                  g_ptr_array_add (uris_array, NULL);
                  uris = (char **)g_ptr_array_free (uris_array, FALSE);
            }

            
            /* Run the nautilus application. */
            application = nautilus_application_new ();

            if (egg_sm_client_is_resumed (application->smclient)) {
                  no_default_window = TRUE;
            }
            
            nautilus_application_startup
                  (application,
                   kill_shell, no_default_window, no_desktop,
                   browser_window,
                   geometry,
                   uris);
            g_strfreev (uris);

            if (is_event_loop_needed ()) {
                  gtk_main ();
            }
      }

      nautilus_icon_info_clear_caches ();
      
      if (application != NULL) {
            g_object_unref (application);
      }

      eel_debug_shut_down ();
      
      return EXIT_SUCCESS;
}

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