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authorGuillaume Cottenceau <gc@mandriva.com>2002-02-27 13:31:30 +0000
committerGuillaume Cottenceau <gc@mandriva.com>2002-02-27 13:31:30 +0000
commit4ad56d5017b21fa3f3aa1052dc308c23afe4dca0 (patch)
tree8e61defbff756a4a61e66888b616b370014782f6 /rescue/restore_ms_boot
parenta6682583fc15396f9e1464b6c59acc6db4d32442 (diff)
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add "restore Windows Boot Loader" to rescue
Diffstat (limited to 'rescue/restore_ms_boot')
-rwxr-xr-xrescue/restore_ms_boot108
1 files changed, 108 insertions, 0 deletions
diff --git a/rescue/restore_ms_boot b/rescue/restore_ms_boot
new file mode 100755
index 000000000..0d674af99
--- /dev/null
+++ b/rescue/restore_ms_boot
@@ -0,0 +1,108 @@
+#!/usr/bin/perl
+#
+# Guillaume Cottenceau (gc@mandrakesoft.com)
+#
+# Copyright 2002 MandrakeSoft
+#
+# This software may be freely redistributed under the terms of the GNU
+# public license.
+#
+# 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+#
+
+sub arch() {
+ my $t = `uname -m`;
+ chomp $t;
+ $t;
+}
+sub if_($@) {
+ my $b = shift;
+ $b or return ();
+ wantarray || @_ <= 1 or die("if_ called in scalar context with more than one argument " . join(":", caller()));
+ wantarray ? @_ : $_[0];
+}
+sub cat_ { local *F; open F, $_[0] or $_[1] ? die "cat of file $_[0] failed: $!\n" : return; my @l = <F>; wantarray ? @l : join '', @l }
+sub member { my $e = shift; foreach (@_) { $e eq $_ and return 1 } 0 }
+
+@known_boot_loaders = qw(lilo grub yaboot);
+
+# keep this in sync with DrakX
+@MBR_signatures = (
+ [ 'empty', 0, "\0\0\0\0" ],
+ [ 'grub', 0x6, "GRUB" ],
+ [ 'grub', 0, "\xEBG", 0x17d, "stage1 \0" ],
+ [ 'grub', 0, "\xEBH", 0x17e, "stage1 \0" ],
+ [ 'grub', 0, "\xEBH", 0x18a, "stage1 \0" ],
+ [ 'grub', 0, "\xEBH", 0x181, "GRUB \0" ],
+ [ 'lilo', 0x2, "LILO" ],
+ [ 'lilo', 0x6, "LILO" ],
+if_(arch() =~ /ppc/,
+ map { [ 'yaboot', 0, "PM", 0x200 * $_ + 0x10, "bootstrap\0" ] } 0 .. 61
+),
+);
+
+sub typeFromMagic {
+ my $f = shift;
+ local *F; sysopen F, $f, 0 or return;
+
+ my $tmp;
+ M: foreach (@MBR_signatures) {
+ my ($name, @l) = @$_;
+ while (@l) {
+ my ($offset, $signature) = splice(@l, 0, 2);
+ sysseek(F, $offset, 0) or next M;
+ sysread(F, $tmp, length $signature);
+ $tmp eq $signature or next M;
+ }
+ return $name;
+ }
+ return 0;
+}
+
+
+my (undef, undef, @parts) = cat_('/proc/partitions');
+
+my @possibilities;
+
+P: foreach (@parts) {
+ my (undef, undef, $blocks, $dev) = split or next;
+ next if $blocks <= 1;
+ my $type = typeFromMagic("/dev/$dev");
+ $type && member($type, @known_boot_loaders) and push @possibilities, [ $dev, $type ];
+}
+
+my $choice;
+
+if (!@possibilities) {
+ print "No known Linux bootloader has been found, nothing to do.\n";
+} elsif (@possibilities == 1) {
+ print "I've found a Linux bootloader only on </dev/$possibilities[0]->[0]>.\n\n";
+ $choice = $possibilities[0];
+} else {
+ print "I've found the following Linux bootloaders:\n";
+ my $i;
+ print "\t", ++$i, ": <$_->[1]> \ton <$_->[0]>\n" foreach @possibilities;
+ print "\n";
+ print "Which disk/partition do you want to overwrite with the Windows bootloader?\n";
+ print "\t<enter the number or press 'n' and Enter to cancel> ";
+ <STDIN> !~ /^(\d+)$/i && $1 >= 1 and $choice = $possibilities[$1-1];
+}
+
+if ($choice) {
+ print "I'm going to overwrite bootloader on </dev/$choice->[0]> with
+Windows bootloader.
+
+Ok? <press Enter to continue, 'n' and Enter to cancel> ";
+ <STDIN> =~ /^n/i and exit 0;
+
+ system("/bin/dd if=/usr/lib/extipl/aldebaran.bin of=/dev/$choice->[0]\n") and print "\tFailed!\n";
+}
+
+#-------------------------------------------------
+#- $Log$
+#- Revision 1.1 2002/02/27 13:31:30 gc
+#- add "restore Windows Boot Loader" to rescue
+#-
+#-