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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 <>
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jan-kiszka authored and igaw committed Jul 5, 2017
1 parent 8e38621 commit 7f1ccba5ea4f1ade36a669c90bbfcffac293edb5
Showing with 11 additions and 0 deletions.
  1. +11 −0 docker-entrypoint
@@ -1,5 +1,16 @@

if mount | grep -q "on / type aufs"; then
cat <<EOF >&2
WARNING: Generation of wic images will fail!
Your docker host setup uses broken aufs as storage driver. Adjust the docker
configuration to use a driver (overlay, overlay2, devicemapper). You may also
need to update the host distribution (e.g. Debian Jessie -> Stretch).


# Create a non-root user that will perform the actual build

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