propagator/cdrom.c

/*
 * Guillaume Cottenceau (gc@mandrakesoft.com)
 *
 * Copyright 2000 MandrakeSoft
 *
 * This software may be freely redistributed under the terms of the GNU
 * public license.
 *
 * 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.
 *
 */

/*
 * Portions from Erik Troan (ewt@redhat.com)
 *
 * Copyright 1996 Red Hat Software 
 *
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <sys/mount.h>
#include "stage1.h"
#include "frontend.h"
#include "modules.h"
#include "probing.h"
#include "log.h"
#include "mount.h"

#include "cdrom.h"

extern char version[];

static int mount_that_cd_device(char * dev_name)
{
	char device_fullname[50];

	strcpy(device_fullname, "/dev/");
	strcat(device_fullname, dev_name);

	return my_mount(device_fullname, IMAGE_LOCATION, "iso9660", 0);
}


static int test_that_cd()
{
	log_message("test file on cd: %s\n", get_ramdisk_path(NULL));
	return access(get_ramdisk_path(NULL), R_OK);
}


static enum return_type try_with_device(char * dev_name, char * dev_model);

static enum return_type do_with_device(char * dev_name, char * dev_model)
{
	struct stat st;
	char msg[256];
	char * ramdisk_path;
	if (test_that_cd()) {
		enum return_type results;
		umount(IMAGE_LOCATION);
		snprintf(msg, sizeof(msg), "That CDROM disc does not seem to be a %s"
				 " Installation CDROM.\nRetry with another disc?", version);
		results = ask_yes_no(msg);
		if (results == RETURN_OK)
			return try_with_device(dev_name, dev_model);
		return results;
	}

	log_message("found a %s CDROM, good news!", version);

	if (IS_RESCUE) {
		load_ramdisk(NULL);
		umount(IMAGE_LOCATION);
	}

	ramdisk_path = get_ramdisk_path(NULL);
	stat(ramdisk_path, &st);
	if (S_ISDIR(st.st_mode)) {
		mount(ramdisk_path, STAGE2_LOCATION, NULL, MS_BIND, NULL);
	} else {
		do_losetup(LIVE_DEVICE,ramdisk_path);
		my_mount(LIVE_DEVICE, STAGE2_LOCATION, (IS_LIVE) ? LIVEFS : STAGE2FS, 0);
	}

	method_name = strdup("cdrom");
	add_to_env("METHOD", method_name);
	add_to_env("PREFIX", "/");

	return RETURN_OK;
}		

static enum return_type try_with_device(char * dev_name, char * dev_model)
{
	wait_message("Trying to access a CDROM disc (drive %s)", dev_model);

	if (mount_that_cd_device(dev_name) == -1) {
		enum return_type results;
		char msg[500];
		unset_param(MODE_AUTOMATIC); /* we are in a fallback mode */
		remove_wait_message();

		snprintf(msg, sizeof(msg), "I can't access a %s Installation disc in your CDROM drive (%s).\nRetry?", version, dev_model);
		results = ask_yes_no(msg);
		if (results == RETURN_OK)
			return try_with_device(dev_name, dev_model);
		return results;
	}	
	remove_wait_message();

	return do_with_device(dev_name, dev_model);
}

enum return_type cdrom_prepare(void)
{
	char ** medias, ** ptr, ** medias_models;
	char * choice;
	int i, count = 0;
	enum return_type results;
	update_splash();
	
	get_medias(CDROM, &medias, &medias_models);

	ptr = medias;
	while (ptr && *ptr) {
		count++;
		ptr++;
	}

	if (count == 0) {
		stg1_error_message("No CDROM device found.");
		i = ask_insmod();
		if (i == RETURN_BACK)
			return RETURN_BACK;
		return cdrom_prepare();
	}

	if (count == 1) {
		results = try_with_device(*medias, *medias_models);
		if (results == RETURN_OK)
			return RETURN_OK;
		i = ask_insmod();
		if (i == RETURN_BACK)
			return RETURN_BACK;
		return cdrom_prepare();
	}

	if (IS_AUTOMATIC) {
		char ** model = medias_models;
		ptr = medias;
		while (ptr && *ptr) {
			wait_message("Trying to access %s CDROM disc (drive %s)", version, *model);
			if (mount_that_cd_device(*ptr) != -1) {
				if (!test_that_cd()) {
					remove_wait_message();
					return do_with_device(*ptr, *model);
				}
				else
					umount(IMAGE_LOCATION);
			}
			remove_wait_message();
			ptr++;
			model++;
		}
		unset_param(MODE_AUTOMATIC);
		return cdrom_prepare();
	}
	else {
		results = ask_from_list_comments("Please choose the CDROM drive to use for the installation.", medias, medias_models, &choice);
		if (results == RETURN_OK) {
			char ** model = medias_models;
			ptr = medias;
			while (ptr && *ptr && model && *model) {
				if (!strcmp(*ptr, choice))
					break;
				ptr++;
				model++;
			}
			results = try_with_device(choice, *model);
		} else
			return results;
	}

	if (results == RETURN_OK)
	{
		update_splash();
		return RETURN_OK;
	}
	if (results == RETURN_BACK)
		return cdrom_prepare();

	i = ask_insmod();
	if (i == RETURN_BACK)
		return RETURN_BACK;
	return cdrom_prepare();
}