share.sh

#!/bin/bash

# Script to link to a container's filesystem
# and expose out via the Samba share.

# Invoke this script via "docker exec"
# (e.g. docker exec dockershare share <container_name>)

CONTAINER_ID=$(docker inspect --format {{.Id}} $1 2> /dev/null)

if [ -d /docker/aufs ]; then
  echo "Storage Driver is AUFS."
  MOUNT_PATH=/docker/aufs/mnt/
  MOUNT_ID=$(cat /docker/image/aufs/layerdb/mounts/$CONTAINER_ID/mount-id 2> /dev/null)
elif [ -d /docker/overlay2 ]; then
  echo "Storage Driver is overlay2."
  MOUNT_PATH=/docker/overlay2/
  MOUNT_ID=$(cat /docker/image/overlay2/layerdb/mounts/$CONTAINER_ID/mount-id 2> /dev/null)
  MOUNT_ID="$MOUNT_ID/merged"
else
  echo "Unknown docker storage driver.  Cannot link container."
fi

if [[ $MOUNT_ID ]]; then
  ln -s $MOUNT_PATH/$MOUNT_ID /containers/$1
fi

if [ -d "/containers/$1" ]; then
  echo "Container $1 linked."
else
  echo "Linking failed for container $1."
fi