I am currently struggling with getting pygrub to work. I am using unstable
9327:cf89e8f0831b with 2.6.16-rc6-git3 on CentOS 4 (although the kernel
version should not matter here).
I dedicated the partition /dev/sdb1 to a virtual machine, used fdisk to
sub-partition this into partitions again. Finally I used dmsetup (device
mapper) to temporarily make the partitions available to format and mount
them, and install the guest OS (linux) from a backup archive.
Using a regular xm config, I can happily boot the guest and it works
perfectly (mounts all partitions and just works). I use disk = [
'phy:sdb1,sda,w' ].
When I use bootloader = "/root/pygrub" instead, I get the following trace
when trying to do xm create:
Traceback (most recent call last):
File "/root/pygrub", line 258, in ?
cf = get_config(file, isconfig)
File "/root/pygrub", line 121, in get_config
fs = fstype.open_fs(fn, offset)
File "/usr/lib/python2.3/site-packages/grub/fsys/ext2/__init__.py", line
35, in open_fs
return Ext2Fs(fn, offset = offset)
ValueError: unable to open file
Error: Boot loader didn't return any data!
I checked the values of fn and offset:
fn = /dev/sdb1
offset = 512
This seems perfectly ok, considering the output of fdisk:
Disk /dev/sdb1: 15.0 GB, 15011103744 bytes
255 heads, 63 sectors/track, 1824 cylinders, total 29318562 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System
/dev/sdb1p1 * 1 208844 104422 83 Linux
/dev/sdb1p2 208845 2313359 1052257+ 82 Linux swap
/dev/sdb1p3 2313360 29302559 13494600 83 Linux
One sector is indeed 512 bytes, so the offset of one sector into /dev/sdb1
seems perfectly ok.
Additionally I tried to copy the partition to an image file with dd. Result:
exactly
the same error as above. Now, using lomount gives this error: "vm1.img: File
too
large".
Copying only the first gigabyte into the image (the boot partition is only
100 mb) makes lomount work (mounts the boot partition correctly), but pygrub
will still say "ValueError: unable to open file" in Ext2Fs, even for the
truncated image file.
Please, help me find and fix this problem.
Best Regards,
Michael Paesold
--
Michael Paesold | Emerion WebHosting Gmbh
mpaesold gmx at | http://www.emerion.com
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