/* * * (c) 2004 Laurent Vivier * */ #include #include #include #include #include #include #include #include "libemile.h" static void usage(int argc, char** argv) { fprintf(stderr, "Usage: %s \n", argv[0]); fprintf(stderr, "Usage: %s -r \n", argv[0]); fprintf(stderr, "\n Allows to set the kernel command line \n"); fprintf(stderr, " into the floppy image or the second level file\n"); fprintf(stderr, " 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; 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; } } ret = emile_second_set_cmdline(fd, cmdline); close(fd); return ret; } int get_cmdline(char* image) { int fd; int ret; char cmdline[255]; 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; } } ret = emile_second_get_cmdline(fd, cmdline); if (ret == -1) return 4; printf("Current command line: \"%s\"\n", cmdline); 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; }