mirror of
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126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
/*
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*
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* (c) 2004 Laurent Vivier <LaurentVivier@wanadoo.fr>
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*
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include "emile.h"
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#include "emile-first.h"
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#include "../second/head.h"
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static void usage(int argc, char** argv)
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{
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fprintf(stderr, "Usage: %s <image> <cmdline>\n", argv[0]);
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fprintf(stderr, "Usage: %s -r <image>\n", argv[0]);
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fprintf(stderr, "\n Allows to set the kernel command line <cmdline>\n");
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fprintf(stderr, " into the floppy image <image>\n");
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fprintf(stderr, " <image> can be a file or a device (/dev/fd0)\n");
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fprintf(stderr, " with \"-r\" flag, display current command line\n");
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fprintf(stderr, "\n Examples:\n");
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fprintf(stderr, "\n To set root filesystem on disk 1 partition 4\n");
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fprintf(stderr, "\n %s floppy.img \"root=/dev/sda4\"\n", argv[0]);
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fprintf(stderr, "\n To set root filesystem on ramdisk\n");
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fprintf(stderr, "\n %s floppy.img \"root=/dev/ramdisk ramdisk_size=2048\"\n", argv[0]);
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fprintf(stderr, "\n To set root filesystem on NFS\n");
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fprintf(stderr, "\n %s floppy.img \"root=/dev/nfs ip=dhcp nfsroot=192.168.100.1:/tftboot/192.168.100.51/\"\n", argv[0]);
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/* and when kernel will support floppy driver:
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* KERNEL_ARGS="vga=normal noinitrd load_ramdisk=1 prompt_ramdisk=1 ramdisk_size=16384 root=/dev/fd0 disksize=1.44 flavor=compact"
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*/
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fprintf(stderr, "\nbuild: \n%s\n", SIGNATURE);
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}
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int set_cmdline(int readonly, char* image, char* cmdline)
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{
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emile_l2_header_t header;
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int fd;
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int ret;
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if (readonly)
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fd = open(image, O_RDONLY);
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else
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fd = open(image, O_RDWR);
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if (fd == -1)
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{
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perror("Cannot open image file");
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return 2;
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}
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ret = lseek(fd, FIRST_LEVEL_SIZE, SEEK_SET);
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if (ret == -1)
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{
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perror("Cannot go to buffer offset");
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close(fd);
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return 3;
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}
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ret = read(fd, &header, sizeof(header));
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if (ret != sizeof(header))
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{
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perror("Cannot read current command line");
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close(fd);
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return 7;
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}
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if (EMILE_02_SIGNATURE != read_long(&header.signature))
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{
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fprintf(stderr, "Bad Header signature\n");
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return 8;
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}
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if (readonly)
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printf("Current command line: \"%s\"\n", header.command_line);
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else
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{
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strncpy(header.command_line, cmdline, 256);
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header.command_line[255] = 0;
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ret = lseek(fd, FIRST_LEVEL_SIZE, SEEK_SET);
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if (ret == -1)
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{
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perror("Cannot go to buffer offset");
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close(fd);
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return 3;
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}
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ret = write(fd, &header, sizeof(header));
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if (ret != sizeof(header))
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{
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perror("Cannot set command line");
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close(fd);
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return 5;
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}
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printf("Command line successfully modified\n");
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}
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close(fd);
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return 0;
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}
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int main(int argc, char** argv)
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{
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int ret;
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if (argc != 3)
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{
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usage(argc, argv);
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return 1;
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}
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if (strcmp(argv[1], "-r") == 0)
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ret = set_cmdline(1, argv[2], NULL);
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else
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ret = set_cmdline(0, argv[1], argv[2]);
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return ret;
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}
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