Add a new member to CopyFlags to request copying of fs-verity status. If copying of fs-verity is requested then we query the descriptor from each regular file. If it has one, we use it to setup fs-verity on the destination, using the same parameters. Signatures don't seem to be a particularly well-loved (or used) feature of fs-verity and we don't bother to query them here. Support for that could be added later, if desired. This change means that, with the correct combination of flags, we might end up calling `fsync()` on a read-only file descriptor. This is permitted by POSIX and supported on Linux. Nothing uses this yet. Signed-off-by: Allison Karlitskaya <allison.karlitskaya@redhat.com>
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