5484l2

Listing 2. make.fdisk

#! /usr/bin/perl

# A perl script to create a script and input file for fdisk to
# re-create the partitions on the hard disk, and format the Linux and
# Linux swap partitions. The first parameter is the fully qualified
# path of the device of the hard disk, e.g. /dev/hda. The two
# resulting files are the script make.dev.x and the data file dev.x
# (where x is the hard drive described, e.g. hda, sdc). make.dev.x is
# run at restore time to rebuild hard drive x, prior to running
# restore.metadata. dev.x is the input file for fdisk.

# Time-stamp: <2001-09-18 09:37:46 ccurley make.fdisk>

# Copyright 2001 Charles Curley except for the subroutine cut2fmt.

# cut2fmt Copyright (c) 1998 Tom Christiansen, Nathan Torkington and
# O'Reilly & Associates, Inc.  Permission is granted to use this code
# freely EXCEPT for book publication.  You may use this code for book
# publication only with the explicit permission of O'Reilly &
# Associates, Inc.

# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.

# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.

# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

# In addition, as a special exception, Tom Christiansen, Nathan
# Torkington and O'Reilly & Associates, Inc.  give permission to use
# the code of this program with the subroutine cut2fmt (or with
# modified versions of the subroutine cut2fmt that use the same
# license as the subroutine cut2fmt), and distribute linked
# combinations including the two.  You must obey the GNU General
# Public License in all respects for all of the code used other than
# the subroutine cut2fmt.  If you modify this file, you may extend
# this exception to your version of the file, but you are not
# obligated to do so.  If you do not wish to do so, delete this
# exception statement and the subroutine cut2fmt from your version.

# You can also contact the Free Software Foundation at http://www.fsf.org/

# fdisk will spit out a file of the form below if you run it as "fdisk
# -l".

# root@tester ~/bin $ fdisk -l /dev/hda

# Disk /dev/hda: 64 heads, 63 sectors, 1023 cylinders
# Units = cylinders of 4032 * 512 bytes

#    Device Boot    Start       End    Blocks   Id  System
# /dev/hda1             1         9     18112+  83  Linux
# /dev/hda2            10      1023   2044224    5  Extended
# /dev/hda5            10       368    723712+  83  Linux
# /dev/hda6           369       727    723712+  83  Linux
# /dev/hda7           728       858    264064+  83  Linux
# /dev/hda8           859       989    264064+  83  Linux
# /dev/hda9           990      1022     66496+  82  Linux swap

# What fdisk does not do is provide output suitable for later
# importing into fdisk, a la sfdisk. This script parses the output
# from fdisk and creates an input file for fdisk. Use the input file
# like so:

# fdisk /dev/hdx < dev.hdx

# For the bare metal restore package, this script also builds a script
# that will execute the above command so you can run it from your zip
# disk. Because the bare metal restore scripts all are in /root/bin,
# the data file and script created by this script are also placed
# there. The same script also creates appropriate Linux file systems,
# either ext2fs, or Linux swap. There is limited support for FAT12 and
# FAT16. There is no support right now (hint, hint) for FAT32. For
# anything else, you're on your own.

# Bad block checking right now is a quick read of the partition. A
# writing check is also possible; add a -w to each command. You
# probably don't need it for a new hard drive, but if you have had a
# hard drive crash on you and you are reusing it (while you are
# waiting for its replacement to come in, I presume), then I highly
# recommend it.

# For more information contact the author, Charles Curley, at
# http://w3.trib.com/~ccurley/.


# cut2fmt figures out the format string for the unpack function we use
# to slice and dice the output from fdisk. From Christiansen and
# Torkington, Perl Cookbook 5.

sub cut2fmt {
    my (@positions) = @_;
    my $template    = '';
    my $lastpos     = 1;

    foreach $place (@positions) {
	$template .= "A" . ($place - $lastpos) . " ";
	$lastpos = $place;
    }

    $template .= "A*";
    return $template;
}

# prepare format string.
$fmt = cut2fmt (11, 19, 24, 34, 45, 49);
# print "Format string is $fmt.\n\n";

# define fields in the array @_.
$dev = 0;
$bootable = 1;
$firstcyl = 2;
$lastcyl = 3;
$parttype = 5;
$partstring = 6;

$target = "\/target";

$device = $ARGV[0];

$outputfilename = $device;
$outputfilename =~ s/\//./g;
$outputfilename = substr ($outputfilename, 1, 100);

$outputfilepath = "\/root\/bin\/";


# Make a hash of the labels.
$mpid = open (MOUNT, "mount -l |") or die "Couldn't fork: $!\n";
while (<MOUNT>) {
    if ($_ =~ /^$device/i) {	# is this a line with a partition in it?
#     	print $_;		# print it just for grins
	split;
	if ($_[6] ne "") {	# only process if there actually is a label
	    $_[6] =~ s/[[\]]//g; # strike [ and ].
	    $labels{$_[0]} = $_[6];
#	    print "The label of file device $_[0] is $labels{$_[0]}.\n";
	}


	# We only mount if it's ext2fs and read and write.

	if ($_[4] eq "ext2" and $_[5] eq "(rw)" ) {
            $mountpoints{$_[2]} = $_[0];
#           print "$_[2] is the mountpoint for $mountpoints{$_[2]}.\n";
	}
    }
}
close (MOUNT);


$fpid = open (FDISK, "fdisk -l $device |") or die "Couldn't fork: $!\n";

open (OUTPUT, "> $outputfilepath${outputfilename}")
    or die "Couldn't open output file $outputfilepath${outputfilename}.\n";

while (<FDISK>) {
    if ($_ =~ /^$device/i) {	# is this a line with a partition in it?
#   	print $_;		# print it just for grins
	chop;			# kill trailing \r
	@_ = unpack ($fmt, $_);

	# now strip white spaces from cylinder numbers
	@_[$firstcyl] =~ s/[ \t]+//;
	@_[$lastcyl] =~ s/[ \t]+//;
	@_[$parttype] =~ s/[ \t]+//;

	$partnumber = substr(@_[$dev], 8, 10); # get partition number for this line
#  	print "  $partnumber, @_[$firstcyl], @_[$lastcyl], @_[$partstring]\n"; # just for grins

	# Here we start creating the input to recreate the partition
	# this line represents.

	print OUTPUT "n\n";
	if ($partnumber < 5) {
	    # primary Linux partition
	    if (@_[$parttype] == 83) {
		print OUTPUT "p\n$partnumber\n@_[$firstcyl]\n";
		if (@_[$firstcyl] ne @_[$lastcyl]) { # in case it's all on one cylinder
		    print OUTPUT "@_[$lastcyl]\n";
		}

		if ($labels{@_[$dev]}) { # do we have a label?
#  		    $format .= "mke2fs @_[$dev] -L $labels{@_[$dev]}\n"; # no bad block check
		    $format .= "echo\necho formatting and checking @_[$dev]\nbadblocks -c 128 -o /tmp/$outputfilename$partnumber @_[$dev]\nmke2fs -L $labels{@_[$dev]} -l /tmp/$outputfilename$partnumber @_[$dev]\n\n";
		} else {
#  		    $format .= "mke2fs @_[$dev]\n";	# no bad block check
		    $format .= "echo\necho formatting and checking @_[$dev]\nbadblocks -c 128 -o /tmp/$outputfilename$partnumber @_[$dev]\nmke2fs -l /tmp/$outputfilename$partnumber @_[$dev]\n\n";
		}

		# extended partition
	    } elsif (@_[$parttype] == 5) {
		print OUTPUT "e\n$partnumber\n@_[$firstcyl]\n";
		if (@_[$firstcyl] ne @_[$lastcyl]) {
		    print OUTPUT "@_[$lastcyl]\n";
		}

		# primary Linux swap partition
	    } elsif (@_[$parttype] == 82) {
		print OUTPUT "p\n$partnumber\n@_[$firstcyl]\n";
		if (@_[$firstcyl] ne @_[$lastcyl]) {
		    print OUTPUT "@_[$lastcyl]\n";
		}
		print OUTPUT "t\n$partnumber\n82\n";
		$format .= "mkswap -c @_[$dev]\n";

		# primary mess-dos partition. We don't handle FAT32,
		# which requires a command line switch for mkdosfs.
	    } elsif ( @_[$parttype] == 1 || @_[$parttype] == 4 || @_[$parttype] == 6 ) {
		print OUTPUT "p\n$partnumber\n@_[$firstcyl]\n";
		if (@_[$firstcyl] ne @_[$lastcyl]) { # in case it's all on one cylinder
		    print OUTPUT "@_[$lastcyl]\n";
		}
		print OUTPUT "t\n$partnumber\n@_[$parttype]\n";
#		$format .= "mkdosfs @_[$dev]\n";	# no bad block check
		$format .= "echo\necho formatting and checking @_[$dev]\nbadblocks -c 128 -o /tmp/$outputfilename$partnumber @_[$dev]\nmkdosfs -l /tmp/$outputfilename$partnumber @_[$dev]\n\n";

	    } else {
		# anything else partition
		print OUTPUT "p\n@_[$firstcyl]\n";
		if (@_[$firstcyl] ne @_[$lastcyl]) {
		    print OUTPUT "@_[$lastcyl]\n";
		}
		print OUTPUT "t\n$partnumber\n@_[$parttype]\n";
	    }

	} else {
	    # logical Linux partition
	    if (@_[$parttype] == 83) {
		print OUTPUT "l\n@_[$firstcyl]\n";
		if (@_[$firstcyl] ne @_[$lastcyl]) {
		    print OUTPUT "@_[$lastcyl]\n";
		}

		if ($labels{@_[$dev]}) { # do we have a label?
#  		    $format .= "mke2fs @_[$dev] -L $labels{@_[$dev]}\n"; # no bad block check
		    $format .= "echo\necho formatting and checking @_[$dev]\nbadblocks -c 128 -o /tmp/$outputfilename$partnumber @_[$dev]\nmke2fs -L $labels{@_[$dev]} -l /tmp/$outputfilename$partnumber @_[$dev]\n\n";
		} else {
#  		    $format .= "mke2fs @_[$dev]\n";	# no bad block check
		    $format .= "echo\necho formatting and checking @_[$dev]\nbadblocks -c 128 -o /tmp/$outputfilename$partnumber @_[$dev]\nmke2fs -l /tmp/$outputfilename$partnumber @_[$dev]\n\n";
		}

		# logical Linux swap partition
	    } elsif (@_[$parttype] == 82 ) {
		print OUTPUT "l\n@_[$firstcyl]\n";
		if (@_[$firstcyl] ne @_[$lastcyl]) {
		    print OUTPUT "@_[$lastcyl]\n";
		}
		print OUTPUT "t\n$partnumber\n82\n";
		$format .= "mkswap -c @_[$dev]\n";

		# primary mess-dos partition. We don't handle FAT32,
		# which requires a command line switch for mkdosfs.
	    } elsif ( @_[$parttype] == 1 || @_[$parttype] == 4 || @_[$parttype] == 6 ) {
		print OUTPUT "p\n$partnumber\n@_[$firstcyl]\n";
		if (@_[$firstcyl] ne @_[$lastcyl]) { # in case it's all on one cylinder
		    print OUTPUT "@_[$lastcyl]\n";
		}
		print OUTPUT "t\n$partnumber\n@_[$parttype]\n";
#		$format .= "mkdosfs @_[$dev]\n";	# no bad block check
		$format .= "echo\necho formatting and checking @_[$dev]\nbadblocks -c 128 -o /tmp/$outputfilename$partnumber @_[$dev]\nmkdosfs -l /tmp/$outputfilename$partnumber @_[$dev]\n\n";

	    } else {
		# anything else partition
		print OUTPUT "l\n@_[$firstcyl]\n";
		if (@_[$firstcyl] ne @_[$lastcyl]) {
		    print OUTPUT "@_[$lastcyl]\n";
		}
		print OUTPUT "t\n$partnumber\n@_[$parttype]\n";
	    }

	}

	# handle bootable partitions
	if (@_[$bootable] =~ /\*/) {
	    print OUTPUT "a\n$partnumber\n";
	}
    }
}

print OUTPUT "v\nw\n";

close (OUTPUT);
close (FDISK);


open (OUTPUT, "> ${outputfilepath}make.$outputfilename")
    or die "Couldn't open output file ${outputfilepath}make.$outputfilename.\n";

print OUTPUT <<FINIS;
#! /bin/sh

# A script to restore the partition data of a hard drive and format
# the partitions. Created at bare metal backup time by the Perl script
# make.fdisk. This script replaces make.partitions which was written
# manually.

# Copyright 2001 Charles Curley.

# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.

# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.

# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

# You can also contact the Free Software Foundation at http://www.fsf.org/

# For more information contact the author, Charles Curley, at
# http://w3.trib.com/~ccurley/.

FINIS

# Clean the old partition table out.
print OUTPUT "dd if=/dev/zero of=$device bs=512 count=2\n\nsync\n\n";

print OUTPUT "fdisk $device \< $outputfilename\n\nsync\n\n";
print OUTPUT $format;

print OUTPUT "\n";

# We have a hash of mount points and devices in %mountpoints. However,
# we have to process them such that directories are built on the
# appropriate target partition. E.g. where /usr/local is on its own
# partition, we have to mount /usr before we build /usr/local. We can
# ensure this by sorting them. Shorter mount point paths will be built
# first. We can't sort a hash directly, so we use an array.

# We build commands to create the appropriate mount points and then
# mount the partitions to the mount points. This is in preparation for
# untarring the contents of the ZIP disk, done in restore.metadata.

foreach $point ( sort keys %mountpoints) {
    print OUTPUT "\n# $point is the mountpoint for $mountpoints{$point}.\n";
    print OUTPUT "mkdir $target$point\n";
    print OUTPUT "mount $mountpoints{$point} $target$point\n";
}


close (OUTPUT);

# These scripts are dangerous & should only be visible to root.

chmod 0700, "${outputfilepath}make.$outputfilename";
chmod 0600, "${outputfilepath}$outputfilename";