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docker: Warn about broken host setup based on aufs

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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>
This commit is contained in:
Jan Kiszka 2017-07-05 14:03:26 +02:00 committed by Daniel Wagner
parent 8e3862112c
commit 7f1ccba5ea
1 changed files with 11 additions and 0 deletions
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11
docker-entrypoint
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@ -1,5 +1,16 @@
#!/bin/bash #!/bin/bash
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).
EOF
fi
USER_ID=${USER_ID:-30000} USER_ID=${USER_ID:-30000}
# Create a non-root user that will perform the actual build # Create a non-root user that will perform the actual build