Richard W.M. Jones b4c460acc2 v2v: Give better diagnostics if filesystem falls back to read-only (RHBZ#1567763).
Some filesystems fall back silently to read-only if there are problems
such a dirty filesystem and an unrecoverable journal.  Almost all
conversions involve writing to the root filesystem, so these will
inevitably fail later on with a strange error message.

Test the root filesystem is writable by creating and deleting a
temporary file, and if the creation fails then give better
diagnostics.

Reported-by: Piotr Kliczewski
(cherry picked from commit 201e6d1595)
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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) 2009-2018 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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