Andrey Drobyshev ef8c6593eb appliance: don't read extfs signature from QCOW2 image directly
If the appliance is a QCOW2 image, function get_root_uuid_with_file()
fails to read ext filesystem signature (0x53EF at offset 0x438) from it.
This results in the following error:

libguestfs: error: /usr/lib64/guestfs/appliance/root: appliance is not
an extfs filesystem

The error itself is harmless, but misleading.  So let's skip retrieving
the signature and UUID in case the image contains QCOW2 header.  It's
safe because in this case we'll retrieve it later from RAW image dumped
from that QCOW2 by "qemu-img dd".

Signed-off-by: Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>
2022-04-25 20:54:48 +01:00
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Libguestfs is tools and a library for accessing and modifying guest
disk images.  For more information see the home page:

  http://libguestfs.org/

For discussion, development, patches, etc. please use the mailing
list:

  http://www.redhat.com/mailman/listinfo/libguestfs

To find out how to build libguestfs from source, read:

  docs/guestfs-building.pod
  http://libguestfs.org/guestfs-building.1.html
  man docs/guestfs-building.1

Copyright (C) 2009-2020 Red Hat Inc.

The library is distributed under the LGPLv2+.  The programs are
distributed under the GPLv2+.  Please see the files COPYING and
COPYING.LIB for full license information.  The examples are under a
very liberal license.
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