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libguestfs/v2v
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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