description "Track if upstart is running in a container"

start on mounted MOUNTPOINT=/run

env container
env LIBVIRT_LXC_UUID

emits container
emits not-container

pre-start script
# The "standard" way of telling if we are in a container
# is to check for "container" in init's environment.
# The code below is for cases where it's not set.

# Detect old-style libvirt
if [ -z "$container" ]; then
[ -n "$LIBVIRT_LXC_UUID" ] && container=lxc-libvirt
fi

# Detect OpenVZ containers
if [ -z "$container" ]; then
[ -d /proc/vz ] && [ ! -d /proc/bc ] && container=openvz
fi

# Detect Vserver containers
if [ -z "$container" ]; then
VXID="$(cat /proc/self/status | grep ^VxID | cut -f2)" || true
[ "${VXID:-0}" -gt 1 ] && container=vserver
fi

if [ -n "$container" ]; then
echo "$container" > /run/container_type || true
initctl emit --no-wait container CONTAINER=$container
exit 0
fi

# If not a container, stop there
rm -f /run/container_type
initctl emit --no-wait not-container
stop
end script