--- xen-4.1.0/tools/pygrub/src/pygrub.orig 2010-12-31 15:24:11.000000000 +0000
+++ xen-4.1.0/tools/pygrub/src/pygrub 2011-01-30 18:58:17.000000000 +0000
@@ -97,6 +97,7 @@
fd = os.open(file, os.O_RDONLY)
buf = os.read(fd, 512)
os.close(fd)
+ offzerocount = 0
for poff in (446, 462, 478, 494): # partition offsets
# MBR contains a 16 byte descriptor per partition
@@ -105,6 +106,7 @@
# offset == 0 implies this partition is not enabled
if offset == 0:
+ offzerocount += 1
continue
if type == FDISK_PART_SOLARIS or type == FDISK_PART_SOLARIS_OLD:
@@ -123,6 +125,9 @@
else:
part_offs.append(offset)
+ if offzerocount == 4:
+ # Might be a grub boot sector pretending to be an MBR
+ part_offs.append(0)
return part_offs
class GrubLineEditor(curses.textpad.Textbox):