propagator/stage1.c

/*
 * Guillaume Cottenceau (gc@mandrakesoft.com)
 *
 * Copyright 2000 MandrakeSoft
 *
 * View the homepage: http://us.mandrakesoft.com/~gc/html/stage1.html
 *
 *
 * 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 <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <stdarg.h>
#include <signal.h>

#include "stage1.h"

#include "log.h"
#include "probing.h"
#include "frontend.h"
#include "modules.h"
#include "tools.h"
#include "automatic.h"
#include "mount.h"
#include "insmod.h"

#ifndef DISABLE_CDROM
#include "cdrom.h"
#endif

#ifndef DISABLE_NETWORK
#include "network.h"
#endif

#ifndef DISABLE_DISK
#include "disk.h"
#endif

extern char *env[];

/************************************************************
 * globals */

char version[128] = DISTRIB_NAME;
char * method_name;

void fatal_error(char *msg)
{
	printf("FATAL ERROR IN STAGE1: %s\n\nI can't recover from this.\nYou may reboot your system.\n", msg);
	while (1);
}


/************************************************************
 * special frontend functs
 * (the principle is to not pollute frontend code with stage1-specific stuff) */

void stg1_error_message(char *msg, ...)
{
	va_list args;
	va_start(args, msg);
	log_message("unsetting automatic");
	unset_param(MODE_AUTOMATIC);
	verror_message(msg, args);
	va_end(args);
}

void stg1_info_message(char *msg, ...)
{
	va_list args;
	va_start(args, msg);
	if (IS_AUTOMATIC) {
		vlog_message(msg, args);
		return;
	}
	vinfo_message(msg, args);
	va_end(args);
}


/************************************************************
 * spawns a shell on console #2 */
static pid_t shell_pid = 0;
static pid_t splash_pid = 0;

static void spawn_shell(void)
{
#ifdef SPAWN_SHELL
	int fd;
	char * shell_name[] = { "/bin/sh", NULL };

	log_message("spawning a shell");

	if (!IS_TESTING) {
		fd = open("/dev/tty2", O_RDWR);
		if (fd == -1) {
			log_message("cannot open /dev/tty2 -- no shell will be provided");
			return;
		}
		else if (access(shell_name[0], X_OK)) {
			log_message("cannot open shell - %s doesn't exist", shell_name[0]);
			return;
		}
		
		if (!(shell_pid = fork())) {
			dup2(fd, 0);
			dup2(fd, 1);
			dup2(fd, 2);
			
			close(fd);
			setsid();
			if (ioctl(0, TIOCSCTTY, NULL))
				log_perror("could not set new controlling tty");

			execve(shell_name[0], shell_name, env);
			log_message("execve of %s failed: %s", shell_name[0], strerror(errno));
			exit(-1);
		}
		
		close(fd);
	}
#endif
}

static void spawn_splash(void)
{
#ifdef SPAWN_SPLASH
	int fd;
	char * splash_name[] = { "/sbin/splash", NULL };

	log_message("spawning a splash screen");
	fd = open("/dev/null", O_RDWR);
	if (fd == -1) {
		log_message("cannot open /dev/null");
		return;
	}
	else if (access(splash_name[0], X_OK)) {
		log_message("%s doesn't exist", splash_name[0]);
		return;
	}
		
	if (!(splash_pid = fork())) {
		dup2(fd, 0);
		dup2(fd, 1);
		dup2(fd, 2);
		close(fd);
		setsid();
		execve(splash_name[0], splash_name, env);
		log_message("execve of %s failed: %s", splash_name[0], strerror(errno));
		exit(-1);
	}

	close(fd);
#endif
}

/************************************************************
 */

static void expert_third_party_modules(void)
{
	enum return_type results;
	char * floppy_mount_location = "/tmp/floppy";
	char ** modules;
	char final_name[500];
	char * choice;
	int rc;
	char * questions[] = { "Options", NULL };
	static char ** answers = NULL;

	results = ask_yes_no("If you want to insert third-party kernel modules, insert "
			     "a Linux (ext2fs) formatted floppy containing the modules and confirm. Otherwise, select \"no\".");;
	if (results != RETURN_OK)
		return;

	my_insmod("floppy", NULL);

	if (my_mount("/dev/fd0", floppy_mount_location, "ext2", 0) == -1) {
		stg1_error_message("I can't find a Linux ext2 floppy in first floppy drive.");
		return expert_third_party_modules();
	}

	modules = list_directory(floppy_mount_location);

	if (!modules || !*modules) {
		stg1_error_message("No modules found on floppy disk.");
		umount(floppy_mount_location);
		return expert_third_party_modules();
	}

	results = ask_from_list("Which driver would you like to insmod?", modules, &choice);
	if (results != RETURN_OK) {
		umount(floppy_mount_location);
		return;
	}

	sprintf(final_name, "%s/%s", floppy_mount_location, choice);

	results = ask_from_entries("Please enter the options:", questions, &answers, 24, NULL);
	if (results != RETURN_OK) {
		umount(floppy_mount_location);
		return expert_third_party_modules();
	}

	rc = insmod_call(final_name, answers[0]);
	umount(floppy_mount_location);

	if (rc) {
		log_message("\tfailed");
		stg1_error_message("Insmod failed.");
	}

	return expert_third_party_modules();
}

/************************************************************
 */

static enum return_type method_select_and_prepare(void)
{
	enum return_type results;
	char * choice;
	char * means[10], * means_auto[10];
	int i;

#ifndef DISABLE_DISK
	char * disk_install = "Hard disk"; char * disk_install_auto = "disk";
#endif
#ifndef DISABLE_CDROM
	char * cdrom_install = "CDROM drive"; char * cdrom_install_auto = "cdrom";
#endif
#ifndef DISABLE_NETWORK
	char * network_nfs_install = "NFS server"; char * network_nfs_install_auto = "nfs";
	char * network_ftp_install = "FTP server"; char * network_ftp_install_auto = "ftp";
	char * network_http_install = "HTTP server"; char * network_http_install_auto = "http";
#endif

	i = 0;
#ifndef DISABLE_NETWORK
	means[i] = network_nfs_install; means_auto[i++] = network_nfs_install_auto;
	means[i] = network_ftp_install; means_auto[i++] = network_ftp_install_auto;
	means[i] = network_http_install; means_auto[i++] = network_http_install_auto;
#endif
#ifndef DISABLE_CDROM
	means[i] = cdrom_install; means_auto[i++] = cdrom_install_auto;
#endif
#ifndef DISABLE_DISK
	means[i] = disk_install; means_auto[i++] = disk_install_auto;
#endif
	means[i] = NULL;
	update_splash();

#ifndef DISABLE_NETWORK
	/* if requested by auto "network" param, bring networking up, regardless of method */
	net_prepare();
#endif

	results = ask_from_list_auto("Please choose the installation method.", means, &choice, "method", means_auto);

	if (results != RETURN_OK)
		return method_select_and_prepare();

	results = RETURN_ERROR;

#ifndef DISABLE_CDROM
	if (!strcmp(choice, cdrom_install))
		results = cdrom_prepare();
#endif

#ifndef DISABLE_DISK
	if (!strcmp(choice, disk_install))
		results = disk_prepare();
#endif
	
#ifndef DISABLE_NETWORK
	if (!strcmp(choice, network_nfs_install))
		results = nfs_prepare();
	
	if (!strcmp(choice, network_ftp_install))
		results = ftp_prepare();
	
	if (!strcmp(choice, network_http_install))
		results = http_prepare();
#endif

	if (results != RETURN_OK)
		return method_select_and_prepare();

	return RETURN_OK;
}

void getversion()
{
	FILE *f;
	char *c;
	
	if (!(f = fopen(VERSION_FILE, "r"))) return;
	if (fgets(version, sizeof(version), f)) {
		c = strrchr(version, '\n');
		if (c) *c = 0;
	}
	fclose(f);
}

void stage1()
{
	enum return_type ret;
	char buf[128];
	char *init;

	open_log();
	getversion();
	log_message("welcome to the %s install (alt-stage1, built " __DATE__ " " __TIME__")", version);
	process_cmdline();
	handle_env(env);
	spawn_shell();
	spawn_splash();
	prepare_progress();
	update_splash();
	snprintf(buf, sizeof(buf), "Welcome to %s", version);
	init_frontend(buf);
	update_splash();

	if (IS_RESCUE && total_memory() < MEM_LIMIT_RESCUE) {
		stg1_error_message("You are starting the rescue with a low memory configuration. "
				   "From that point, experience showed us that the program may stop "
				   "or crash at any point without immediate proper reason. Continue at "
				   "your own risk. Alternatively, you may reboot your system now.");
	}

	init = get_param_valued("init");
	if (init)
		add_to_env("INIT", init);

	ret = method_select_and_prepare();

	finish_frontend();
	update_splash();

	close_log();
	close_progress();
	if (ret != RETURN_OK)
		fatal_error("could not select an installation method");

	/* all went good */
	if (shell_pid != 0)
		kill(shell_pid, 9);

	if (splash_pid != 0)
		kill(splash_pid, 9);

	pass_env(4);

	exit(0);
}