From 7f1ccba5ea4f1ade36a669c90bbfcffac293edb5 Mon Sep 17 00:00:00 2001 From: Jan Kiszka Date: Wed, 5 Jul 2017 14:03:26 +0200 Subject: [PATCH] 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 --- docker-entrypoint | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/docker-entrypoint b/docker-entrypoint index ca30d52..3bfa372 100755 --- a/docker-entrypoint +++ b/docker-entrypoint @@ -1,5 +1,16 @@ #!/bin/bash +if mount | grep -q "on / type aufs"; then + cat <&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} # Create a non-root user that will perform the actual build