Allison Karlitskaya 56a279a7f7 copy: add support for copying fs-verity status
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>
2025-05-27 08:08:34 +02:00
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