/* $Id$
 * UDP Gateway utility startup scripts support using chkconfig(8)
 * Copyright (C) 2004 Jan Kratochvil <project-udpgate@jankratochvil.net>
 * 
 * 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; exactly version 2 of June 1991 is required
 * 
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */


#include "config.h"

#include <glib/gmessages.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <glib/gmem.h>
#include <unistd.h>
#include <string.h>
#include <sys/stat.h>

#include "startup-chkconfig.h"	/* self */

#ifdef ENABLE_BUNDLE
#include "bundle-util.h"
#endif


/* Config: */
/* Do not: /etc/rc.d/init.d/...
 * to comply with http://www.linuxbase.org/spec/booksets/LSB-Core/LSB-Core.html#INITSRCINSTRM
 */
#define INIT_D_PATHNAME G_STRINGIFY(SYSCONFDIR) "/init.d/" PACKAGE

#define COMMAND_INSTALL_INIT_D "/usr/lib/lsb/install_initd"
#define COMMAND_REMOVE_INIT_D  "/usr/lib/lsb/remove_initd"


#define STATUS_0_1(status) ( \
		!(WIFEXITED((status)) && (WEXITSTATUS((status))==0 || WEXITSTATUS((status))==1) \
						&& !WIFSIGNALED((status)) \
						&& !WIFSTOPPED((status))) \
				? -1 : WEXITSTATUS((status)))

static gboolean chkexec(const gchar *binary)
{
struct stat statbuf;

	g_return_val_if_fail(binary!=NULL,FALSE);

	if (stat(COMMAND_INSTALL_INIT_D,&statbuf))
		return FALSE;
	if ((statbuf.st_mode&(S_IFMT|0111))!=(S_IFREG|0111))
		return FALSE;

	return TRUE;
}


gboolean startup_chkconfig_init(void)
{
static gboolean r,r_set=FALSE;

	if (!r_set) {
int status;
const gchar *command="chkconfig " PACKAGE;

		/* LSB compliant 'query' is not standardized. */
		if (chkexec(COMMAND_INSTALL_INIT_D) && chkexec(COMMAND_REMOVE_INIT_D))
			r=TRUE;
		else {
			status=system(command);
			if (STATUS_0_1(status)<0) {
				g_warning(_("Error checking validity of chkconfig(8) setup; automatic startup disabled; failed command: %s"),command);
				r=FALSE;
				}
			else
				r=TRUE;
			}
		r_set=TRUE;
		}
	return r;
}

gboolean startup_chkconfig_query(gboolean *is_on)
{
int status,status_0_1;
const gchar *command="chkconfig " PACKAGE;

	g_return_val_if_fail(is_on!=NULL,FALSE);

	if (!startup_chkconfig_init())
		return FALSE;

	/* LSB compliant 'query' is not standardized. */
	status=system(command);
	status_0_1=STATUS_0_1(status);
	if (status_0_1<0) {
		g_warning(_("Error checking registrance of this program automatic startup by: %s"),command);
		return FALSE;
		}
	*is_on=(status_0_1==0);
	return TRUE;
}

gboolean startup_chkconfig_on(void)
{
int status;
const gchar *command="chkconfig --add";

	if (!startup_chkconfig_init())
		return FALSE;

#ifdef ENABLE_BUNDLE
	if (!bundle_util_file_write(
			INIT_D_PATHNAME,	/* pathname */
			PACKAGE ".init",	/* basename */
			0755,	/* pathname_mode */
			TRUE))	/* pathname_backup */
		return FALSE;
#endif /* ENABLE_BUNDLE */

	if (chkexec(COMMAND_INSTALL_INIT_D))
		command=COMMAND_INSTALL_INIT_D;
	command=udpgate_printf_alloca("%s %s",command,PACKAGE);
	status=system(command);

	if (0!=STATUS_0_1(status)) {
		g_warning(_("Error registering automatic program startup by: %s"),command);
		return FALSE;
		}
	return TRUE;
}

gboolean startup_chkconfig_off(void)
{
const gchar *command="chkconfig --del";
int status;

	if (!startup_chkconfig_init())
		return FALSE;

	if (chkexec(COMMAND_REMOVE_INIT_D))
		command=COMMAND_REMOVE_INIT_D;
	command=udpgate_printf_alloca("%s %s",command,PACKAGE);
	status=system(command);
	if (0!=STATUS_0_1(status)) {
		g_warning(_("Error removing program's system startup registrance by: %s"),command);
		return FALSE;
		}
#ifdef ENABLE_BUNDLE
	if (!bundle_util_file_remove(INIT_D_PATHNAME,PACKAGE ".init"))
		return FALSE;
#endif /* ENABLE_BUNDLE */
	return TRUE;
}