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b4c460acc2bd07fc9bb21fb2fed970fa8253ebc8
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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