mirror of https://github.com/vitalif/e2fsprogs
189 lines
4.2 KiB
C
189 lines
4.2 KiB
C
/*
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* e2image.c --- Program which writes an image file backing up
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* critical metadata for the filesystem.
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*
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* Copyright 2000, 2001 by Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*/
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#include <fcntl.h>
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#include <grp.h>
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#ifdef HAVE_GETOPT_H
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#include <getopt.h>
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#else
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extern char *optarg;
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extern int optind;
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#endif
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "ext2fs/ext2_fs.h"
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#include "ext2fs/ext2fs.h"
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#include "et/com_err.h"
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#include "uuid/uuid.h"
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#include "e2p/e2p.h"
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#include "ext2fs/e2image.h"
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#include "../version.h"
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#include "nls-enable.h"
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const char * program_name = "e2image";
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char * device_name = NULL;
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static void usage(void)
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{
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fprintf(stderr, _("Usage: %s device file\n"), program_name);
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exit (1);
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}
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static void write_header(int fd, struct ext2_image_hdr *hdr, int blocksize)
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{
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char *header_buf;
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int actual;
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header_buf = malloc(blocksize);
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if (!header_buf) {
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fprintf(stderr, _("Couldn't allocate header buffer\n"));
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exit(1);
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}
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if (lseek(fd, 0, SEEK_SET) < 0) {
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perror("lseek while writing header");
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exit(1);
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}
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memset(header_buf, 0, blocksize);
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if (hdr)
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memcpy(header_buf, hdr, sizeof(struct ext2_image_hdr));
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actual = write(fd, header_buf, blocksize);
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if (actual < 0) {
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perror("write header");
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exit(1);
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}
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if (actual != blocksize) {
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fprintf(stderr, _("short write (only %d bytes) for"
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"writing image header"), actual);
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exit(1);
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}
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free(header_buf);
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}
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int main (int argc, char ** argv)
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{
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int c;
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errcode_t retval;
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ext2_filsys fs;
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int open_flag = 0;
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int raw_flag = 0;
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int fd = 0;
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struct ext2_image_hdr hdr;
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struct stat st;
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#ifdef ENABLE_NLS
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setlocale(LC_MESSAGES, "");
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bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
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textdomain(NLS_CAT_NAME);
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#endif
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fprintf (stderr, _("e2image %s, %s for EXT2 FS %s, %s\n"),
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E2FSPROGS_VERSION, E2FSPROGS_DATE,
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EXT2FS_VERSION, EXT2FS_DATE);
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if (argc && *argv)
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program_name = *argv;
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initialize_ext2_error_table();
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while ((c = getopt (argc, argv, "r")) != EOF)
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switch (c) {
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case 'r':
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raw_flag++;
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break;
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default:
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usage();
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}
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if (optind != argc - 2 )
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usage();
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device_name = argv[optind];
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retval = ext2fs_open (device_name, open_flag, 0, 0,
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unix_io_manager, &fs);
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if (retval) {
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com_err (program_name, retval, _("while trying to open %s"),
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device_name);
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printf(_("Couldn't find valid filesystem superblock.\n"));
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exit(1);
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}
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fd = open(argv[optind+1], O_CREAT|O_RDWR, 0600);
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if (fd < 0) {
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com_err(program_name, errno, _("while trying to open %s"),
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argv[optind+1]);
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exit(1);
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}
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write_header(fd, NULL, fs->blocksize);
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memset(&hdr, 0, sizeof(struct ext2_image_hdr));
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hdr.offset_super = lseek(fd, 0, SEEK_CUR);
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retval = ext2fs_image_super_write(fs, fd, 0);
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if (retval) {
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com_err(program_name, retval, _("while writing superblock"));
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exit(1);
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}
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hdr.offset_inode = lseek(fd, 0, SEEK_CUR);
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retval = ext2fs_image_inode_write(fs, fd, IMAGER_FLAG_SPARSEWRITE);
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if (retval) {
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com_err(program_name, retval, _("while writing inode table"));
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exit(1);
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}
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hdr.offset_blockmap = lseek(fd, 0, SEEK_CUR);
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retval = ext2fs_image_bitmap_write(fs, fd, 0);
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if (retval) {
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com_err(program_name, retval, _("while writing block bitmap"));
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exit(1);
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}
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hdr.offset_inodemap = lseek(fd, 0, SEEK_CUR);
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retval = ext2fs_image_bitmap_write(fs, fd, IMAGER_FLAG_INODEMAP);
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if (retval) {
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com_err(program_name, retval, _("while writing inode bitmap"));
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exit(1);
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}
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hdr.magic_number = EXT2_ET_MAGIC_E2IMAGE;
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strcpy(hdr.magic_descriptor, "Ext2 Image 1.0");
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gethostname(hdr.fs_hostname, sizeof(hdr.fs_hostname));
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strncat(hdr.fs_device_name, device_name, sizeof(hdr.fs_device_name));
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hdr.fs_device_name[sizeof(hdr.fs_device_name) - 1] = 0;
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hdr.fs_blocksize = fs->blocksize;
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if (stat(device_name, &st) == 0)
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hdr.fs_device = st.st_rdev;
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if (fstat(fd, &st) == 0) {
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hdr.image_device = st.st_dev;
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hdr.image_inode = st.st_ino;
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}
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memcpy(hdr.fs_uuid, fs->super->s_uuid, sizeof(hdr.fs_uuid));
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hdr.image_time = time(0);
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write_header(fd, &hdr, fs->blocksize);
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ext2fs_close (fs);
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exit (0);
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}
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