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 <jan.kiszka@siemens.com>
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#!/bin/bash
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#!/bin/bash
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if mount | grep -q "on / type aufs"; then
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cat <<EOF >&2
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WARNING: Generation of wic images will fail!
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Your docker host setup uses broken aufs as storage driver. Adjust the docker
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configuration to use a driver (overlay, overlay2, devicemapper). You may also
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need to update the host distribution (e.g. Debian Jessie -> Stretch).
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EOF
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fi
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USER_ID=${USER_ID:-30000}
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USER_ID=${USER_ID:-30000}
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# Create a non-root user that will perform the actual build
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# Create a non-root user that will perform the actual build
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