Greetings! I have added the following new features:
1) when grub-setup runs, it automatically stores the areas of (mbr + embed) region, which are overwritten, into the file (in the following specified format) in root directory. 2) grub-setup can restore the stored mbr in the following format back to destination drive: Format: ------------------------------------------------------------------------------------------------- 1st 8 bytes - for embed_region.start [ this is of type grub_uint64_t - 8bytes for sure] next 8 bytes for the core_size, which is of size_t format. I put 8 bytes for this because if we want to restore the backup file from i386, it will not cause a problem. next core_size bytes for core.img next one byte contains 0xff - used as a signature bit, seperating the embed and mbr regions next GRUB_DISK_SECTOR_SIZE bytes for mbr ------------------------------------------------------------------------------------------------- Typical operations: 1) grub-setup --help: Usage: grub-setup [OPTION]... DEVICE Set up images to boot from DEVICE. DEVICE must be a GRUB device (e.g. ``(hd0,1)''). -b, --boot-image=FILE use FILE as the boot image [default=boot.img] -c, --core-image=FILE use FILE as the core image [default=core.img] -Z, --backup-file=FILE use FILE as the backup/restore file [default=bootsector.bak] -d, --directory=DIR use GRUB files in the directory DIR [default=/boot/grub] -m, --device-map=FILE use FILE as the device map [default=/boot/grub/device.map] -r, --root-device=DEV use DEV as the root device [default=guessed] -f, --force install even if problems are detected -h, --help display this message and exit -z, --restore restore the boot sectors -V, --version print version information and exit -v, --verbose print verbose messages Therefore when we execute grub-setup -d <dir> /dev/sda (optionally -Z backup-file name), it will create a file called bootsector.bak in <dir> and write to it. RESTORATION: (grub-setup --restore ) V ( grub-setup -z ) V (grub-setup -z -Z backup_file) .... [ according to the modified help ] PROBLEMS: A warning: util/i386/pc/grub-setup.c:93: warning: ‘backup_img’ may be used uninitialized in this function When I remove the line (496 in the patched one): free(backup_img); the warning goes off. I could not understand how to resolve it. I need some help PATCH DETAILS: Patch obtained by svn di util/i386/pc/grub-setup.c applyihng patch: patch util/i386/pc/grub-setup.c patch_save_mbr I tried my best to follow the coding standards and the style. I am very enthusiastic in developing grub. Please suggest better format for storing the boot sectors. I hope I am not introducing more bugs. Thank you, Kashyap Garimella Jagannadh (irc: garimella ) Undergraduate student, Indian Instition of Technology (IIT), Madras.
patch_save_mbr
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