docker run --rm -v /usr/local/bin:/target jpetazzo/nsenter

#!/bin/bash

#This script is dynamic mount docker volumens

#Author Deng Lei

if [ -z $1 ] || [ -z $2 ] || [ -z $3 ]; then

    echo "Usage: container_name physics_volumes container_volumes"

    echo "Example: I want mount physics /tmp/test to container /src in test"

    echo "The command is: bash `basename $0` test_container_id /tmp/test /src "

    exit 1

fi

which nsenter &>>/dev/null

if [ $? -ne 0 ];then

    echo "plsease install nsenser,command is:yum install util-linux"

    exit 1

fi

set -e

CONTAINER=$1

HOSTPATH=$2

CONTPATH=$3

if [ ! -d $HOSTPATH ];then

    echo "physics $HOSTPATH is not exist!"

    exit 1

fi

REALPATH=$(readlink --canonicalize $HOSTPATH)

FILESYS=$(df -P $REALPATH | tail -n 1 | awk '{print $6}')

while read DEV MOUNT JUNK

    do

        [ $MOUNT = $FILESYS ] && [ $DEV != "rootfs" ] && break

    done </proc/mounts

[ $MOUNT = $FILESYS ] # Sanity check!

while read A B C SUBROOT MOUNT JUNK

    do [ $MOUNT = $FILESYS ] && break

    done < /proc/self/mountinfo

[ $MOUNT = $FILESYS ] # Moar sanity check!

SUBPATH=$(echo $REALPATH | sed s,^$FILESYS,,)

DEVDEC=$(printf "%d %d" $(stat --format "0x%t 0x%T" $DEV))

PID=$(docker inspect --format "{{.State.Pid}}" "$CONTAINER")

run_command="nsenter --target $PID --mount --uts --ipc --net --pid -- sh -c"

if  [ `$run_command "mount|grep $CONTPATH|wc -l"` -ne 0 ];then

    echo "container $CONTAINER mount dir $CONTPATH is mounting!"

    exit 1

fi

$run_command "[ -b $DEV ] ||mknod --mode 0600 $DEV b $DEVDEC"

$run_command "mkdir /tmpmnt"

$run_command "mount $DEV /tmpmnt"

$run_command "mkdir -p $CONTPATH"

$run_command "mount -o bind /tmpmnt/$SUBROOT/$SUBPATH $CONTPATH"

$run_command "umount /tmpmnt"

$run_command "rmdir /tmpmnt"

check_result=`$run_command "mount|grep $CONTPATH|wc -l"`

if [ $check_result -ne 0 ];then

    echo "dymainc mount physics $HOSTPATH on $CONTAINER $CONTPATH is success!"

else

    echo "dymaninc mount physics $HOSTPATH on $CONTAINER $CONTPATH is fail!"

fi

chmod a+x t.sh

. ./t.sh d54b05a35b4b /opt/hail/ /opt/hail/