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docker: Warn about broken host setup based on aufs
There is a nasty problem with legacy aufs: wic tries to find out the block size of the filesystem that holds the partition images, but aufs does not seem to implement this properly, returning 0 at least on Debian Jessie. That makes wic become upset and through a division-by-zero exception soon after. Catch this case by warning the user about the inappropriate docker setup during container start. Signed-off-by: Jan Kiszka <email@example.com>
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