/***************************************************************************
 * CVSID: $Id$
 *
 * hal-storage-unmount.c : Unmount wrapper
 *
 * Copyright (C) 2006 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <glib/gstdio.h>
#ifdef __FreeBSD__
#include <fstab.h>
#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/mount.h>
#include <limits.h>
#include <pwd.h>
#elif sun
#include <fcntl.h>
#include <sys/mnttab.h>
#include <sys/vfstab.h>
#else
#include <mntent.h>
#endif
#include <sys/types.h>
#include <unistd.h>

#include <libhal.h>
#include <libhal-storage.h>
#ifdef HAVE_POLKIT
#include <libpolkit.h>
#endif

#include "hal-storage-shared.h"


static void
usage (void)
{
        fprintf (stderr, "This program should only be started by hald.\n");
        exit (1);
}

static void
invalid_unmount_option (const char *option, const char *uid)
{
        fprintf (stderr, "org.freedesktop.Hal.Device.Volume.InvalidUnmountOption\n");
        fprintf (stderr, "The option '%s' is not allowed for uid=%s\n", option, uid);
        exit (1);
}

int
main (int argc, char *argv[])
{
        char *udi;
        char *device;
        LibHalVolume *volume;
        DBusError error;
        LibHalContext *hal_ctx = NULL;
        DBusConnection *system_bus = NULL;
#ifdef HAVE_POLKIT
        LibPolKitContext *pol_ctx = NULL;
#endif
        char *invoked_by_uid;
        char *invoked_by_syscon_name;
        int i;
        char unmount_options[1024];
        char **given_options;
        gboolean use_lazy;
        gboolean use_force;
        const char *end;

        if (!lock_hal_mtab ()) {
                unknown_error ("Cannot obtain lock on /media/.hal-mtab");
        }

        device = getenv ("HAL_PROP_BLOCK_DEVICE");
        if (device == NULL)
                usage ();

        udi = getenv ("HAL_PROP_INFO_UDI");
        if (udi == NULL)
                usage ();

        invoked_by_uid = getenv ("HAL_METHOD_INVOKED_BY_UID");

        invoked_by_syscon_name = getenv ("HAL_METHOD_INVOKED_BY_SYSTEMBUS_CONNECTION_NAME");

        dbus_error_init (&error);
        if ((hal_ctx = libhal_ctx_init_direct (&error)) == NULL) {
                printf ("Cannot connect to hald\n");
                LIBHAL_FREE_DBUS_ERROR (&error);
                usage ();
        }

        dbus_error_init (&error);
        system_bus = dbus_bus_get (DBUS_BUS_SYSTEM, &error);
        if (system_bus == NULL) {
                printf ("Cannot connect to the system bus\n");
                LIBHAL_FREE_DBUS_ERROR (&error);
                usage ();
        }
#ifdef HAVE_POLKIT
        pol_ctx = libpolkit_new_context (system_bus);
        if (pol_ctx == NULL) {
                printf ("Cannot get libpolkit context\n");
                unknown_error ("Cannot get libpolkit context");
        }
#endif

        /* read from stdin */
        if (strlen (fgets (unmount_options, sizeof (unmount_options), stdin)) > 0)
                unmount_options [strlen (unmount_options) - 1] = '\0';
        /* validate that input from stdin is UTF-8 */
        if (!g_utf8_validate (unmount_options, -1, &end))
                unknown_error ("Error validating unmount_options as UTF-8");
#ifdef DEBUG
        printf ("unmount_options  = '%s'\n", unmount_options);
#endif

        /* delete any trailing whitespace options from splitting the string */
        given_options = g_strsplit (unmount_options, "\t", 0);
        for (i = g_strv_length (given_options) - 1; i >= 0; --i) {
                if (strlen (given_options[i]) > 0)
                        break;
                given_options[i] = NULL;
        }

        use_lazy = FALSE;
        use_force = FALSE;

        /* check unmount options */
        for (i = 0; given_options[i] != NULL; i++) {
                char *given = given_options[i];

                if (strcmp (given, "lazy") == 0) {
                        use_lazy = TRUE;
                } else if (strcmp (given, "force") == 0) {
                        use_force = TRUE;
                } else {
                        invalid_unmount_option (given, invoked_by_uid);
                }
        }
        g_strfreev (given_options);


        volume = libhal_volume_from_udi (hal_ctx, udi);
        if (volume == NULL) {
                LibHalDrive *drive;

                drive = libhal_drive_from_udi (hal_ctx, udi);
                if (drive == NULL) {
                        usage ();
                } else {
                        handle_unmount (hal_ctx,
#ifdef HAVE_POLKIT
                                        pol_ctx,
#endif
                                        udi, NULL, drive, device, invoked_by_uid,
                                        invoked_by_syscon_name, use_lazy, use_force,
                                        system_bus);
                }

        } else {
                const char *drive_udi;
                LibHalDrive *drive;

                drive_udi = libhal_volume_get_storage_device_udi (volume);

                if (drive_udi == NULL)
                        unknown_error ("Cannot get drive_udi from volume");
                drive = libhal_drive_from_udi (hal_ctx, drive_udi);
                if (drive == NULL)
                        unknown_error ("Cannot get drive from hal");

                handle_unmount (hal_ctx,
#ifdef HAVE_POLKIT
                                pol_ctx,
#endif
                                udi, volume, drive, device, invoked_by_uid,
                                invoked_by_syscon_name, use_lazy, use_force,
                                system_bus);

        }

        unlock_hal_mtab ();

        return 0;
}