/*
 * 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.
 *
 */

/*
 * (1) calculate dependencies
 * (2) unarchive relevant modules
 * (3) insmod them
 */

#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/mount.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>

#include "stage1.h"
#include "log.h"
#include "frontend.h"
#include "mount.h"
#include "modules.h"

static const char *moderror(int err)
{
	switch (err) {
	case ENOEXEC:
		return "Invalid module format";
	case ENOENT:
		return "Unknown symbol in module";
	case ESRCH:
		return "Module has wrong symbol version";
	case EINVAL:
		return "Invalid parameters";
	default:
		return strerror(err);
	}
}

static void *grab_file(const char *filename, unsigned long *size)
{
	unsigned int max = 16384;
	int ret, fd;
	void *buffer = malloc(max);

	fd = open(filename, O_RDONLY, 0);
	if (fd < 0)
		return NULL;

	*size = 0;
	while ((ret = read(fd, buffer + *size, max - *size)) > 0) {
		*size += ret;
		if (*size == max)
			buffer = realloc(buffer, max *= 2);
	}
	if (ret < 0) {
		free(buffer);
		buffer = NULL;
	}
	close(fd);
	return buffer;
}

int insmod_call(char *pathname, char *params)
{
	void *file;
	unsigned long len;
	int rc = -1;
	
	file = grab_file(pathname, &len);
	if (!file) {
		log_message("insmod: can't read '%s': %s", pathname, strerror(errno));
		return rc;
	}

	rc = init_module(file, len, params == NULL ? "" : params);
	free(file);
	if (rc != 0 && errno != EEXIST) {
		log_message("init_module: '%s': %s", pathname, moderror(errno));
		return rc;
	}
	return 0;
}

static enum insmod_return modprobe(const char * mod_name, char * options)
{
	int pid, status;
	if (!(pid = fork())) {
		char * argv[] = { "/sbin/modprobe", (char *)mod_name, options, NULL };
		execve(argv[0], argv, NULL);
		log_message("modprobe %s failed", mod_name);
	}
	waitpid(pid, &status, 0);
	return WIFEXITED(status) ? INSMOD_OK : INSMOD_FAILED;
}

enum insmod_return my_insmod(const char * mod_name, char * options)
{
	int i;

	log_message("have to insmod %s", mod_name);

	if (IS_TESTING)
		return INSMOD_OK;

	i = modprobe(mod_name, options);
	if (i == 0) {
		log_message("\tsucceeded %s", mod_name);
	} else
		log_message("warning, insmod failed (%s %s) (%d)", mod_name, options, i);

	return i;
}

enum return_type ask_insmod()
{
	return RETURN_ERROR;
}

void update_modules(void)
{
	FILE * f;
	char ** disk_contents;
	char final_name[500];
	char floppy_mount_location[] = "/tmp/floppy";

	stg1_info_message("Please insert the Update Modules floppy.");;

	my_insmod("floppy", NULL);

	if (my_mount("/dev/fd0", floppy_mount_location, "ext2", 0) == -1) {
		enum return_type results = ask_yes_no("I can't find a Linux ext2 floppy in first floppy drive.\n"
						      "Retry?");
		if (results == RETURN_OK)
			return update_modules();
		return;
	}

	disk_contents = list_directory(floppy_mount_location);

	if (!(f = fopen("/tmp/floppy/to_load", "rb"))) {
		stg1_error_message("I can't find \"to_load\" file.");
		umount(floppy_mount_location);
		return update_modules();
	}
	while (1) {
		char module[500];
		char * options;
		char ** entry = disk_contents;

		if (!fgets(module, sizeof(module), f)) break;
		if (module[0] == '#' || strlen(module) == 0)
			continue;

		while (module[strlen(module)-1] == '\n')
			module[strlen(module)-1] = '\0';
		options = strchr(module, ' ');
		if (options) {
			options[0] = '\0';
			options++;
		}

		log_message("updatemodules: (%s) (%s)", module, options);
		while (entry && *entry) {
			if (!strncmp(*entry, module, strlen(module)) && (*entry)[strlen(module)] == '.') {
				sprintf(final_name, "%s/%s", floppy_mount_location, *entry);
				if (insmod_call(final_name, options)) {
					log_message("\t%s (floppy): failed", *entry);
					stg1_error_message("Insmod %s (floppy) failed.", *entry);
				}
				break;
			}
			entry++;
		}
		if (!entry || !*entry) {
			enum insmod_return ret = my_insmod(module, options);
			if (ret != INSMOD_OK) {
				log_message("\t%s (marfile): failed", module);
				stg1_error_message("Insmod %s (marfile) failed.", module);
			}
		}
	}
	fclose(f);
}