EMILE/tools/emile-set-cmdline.c
2005-11-28 20:56:06 +00:00

157 lines
3.4 KiB
C

/*
*
* (c) 2004 Laurent Vivier <LaurentVivier@wanadoo.fr>
*
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include "libemile.h"
static void usage(int argc, char** argv)
{
fprintf(stderr, "Usage: %s <file> <cmdline>\n", argv[0]);
fprintf(stderr, "Usage: %s -r <file>\n", argv[0]);
fprintf(stderr, "\n Allows to set the kernel command line <cmdline>\n");
fprintf(stderr, " into the floppy image or the second level file\n");
fprintf(stderr, " <image> can be a file or a device (/dev/fd0)\n");
fprintf(stderr, " with \"-r\" flag, display current command line\n");
fprintf(stderr, "\n Examples:\n");
fprintf(stderr, "\n To set root filesystem on disk 1 partition 4\n");
fprintf(stderr, "\n %s floppy.img \"root=/dev/sda4\"\n", argv[0]);
fprintf(stderr, "\n To set root filesystem on ramdisk\n");
fprintf(stderr, "\n %s floppy.img \"root=/dev/ramdisk ramdisk_size=2048\"\n", argv[0]);
fprintf(stderr, "\n To set root filesystem on NFS\n");
fprintf(stderr, "\n %s floppy.img \"root=/dev/nfs ip=dhcp nfsroot=192.168.100.1:/tftboot/192.168.100.51/\"\n", argv[0]);
/* and when kernel will support floppy driver:
* KERNEL_ARGS="vga=normal noinitrd load_ramdisk=1 prompt_ramdisk=1 ramdisk_size=16384 root=/dev/fd0 disksize=1.44 flavor=compact"
*/
fprintf(stderr, "\nbuild: \n%s\n", SIGNATURE);
}
int set_cmdline(char* image, char* cmdline)
{
int fd;
int ret;
int drive, second, size;
char *configuration;
off_t offset;
fd = open(image, O_RDWR);
if (fd == -1)
{
perror("Cannot open image file");
return 2;
}
/* can work on an image or directly on second level file */
ret = emile_first_get_param(fd, &drive, &second, &size);
if (ret == EEMILE_UNKNOWN_FIRST)
{
/* should be a second level file */
ret = lseek(fd, 0, SEEK_SET);
if (ret == -1)
{
perror("Cannot go to buffer offset");
close(fd);
return 3;
}
}
offset = lseek(fd, 0, SEEK_CUR);
configuration = emile_second_get_configuration(fd);
if (configuration == NULL)
return 4;
emile_second_set_property(configuration, "parameters", cmdline);
ret = lseek(fd, offset, SEEK_SET);
if (ret == -1)
return 5;
ret = emile_second_set_configuration(fd, configuration);
if (ret != 0)
return 6;
free(configuration);
close(fd);
return 0;
}
int get_cmdline(char* image)
{
int fd;
int ret;
char cmdline[255];
char *configuration;
int drive, second, size;
fd = open(image, O_RDONLY);
if (fd == -1)
{
perror("Cannot open image file");
return 2;
}
/* can work on an image or directly on second level file */
ret = emile_first_get_param(fd, &drive, &second, &size);
if (ret == EEMILE_UNKNOWN_FIRST)
{
/* should be a second level file */
ret = lseek(fd, 0, SEEK_SET);
if (ret == -1)
{
perror("Cannot go to buffer offset");
close(fd);
return 3;
}
}
configuration = emile_second_get_configuration(fd);
if (configuration == NULL)
return 4;
ret = emile_second_get_property(configuration, "parameters", cmdline);
if (ret != 0)
fprintf(stderr, "No command line found\n");
else
printf("Current command line: \"%s\"\n", cmdline);
free(configuration);
close(fd);
return 0;
}
int main(int argc, char** argv)
{
int ret;
if (argc != 3)
{
usage(argc, argv);
return 1;
}
if (strcmp(argv[1], "-r") == 0)
ret = get_cmdline(argv[2]);
else
ret = set_cmdline(argv[1], argv[2]);
return ret;
}