Shared mounts

shared-mounts-nodocker.sh

#!/usr/bin/env bash                                                                                                                    

ROOTDIR=$PWD

echo "Setting up"
mkdir -p $ROOTDIR/shared
sudo mount --bind $ROOTDIR/shared $ROOTDIR/shared
sudo mount --make-unbindable $ROOTDIR/shared
sudo mount --make-shared $ROOTDIR/shared

mkdir -p $ROOTDIR/shared2
sudo mount --bind $ROOTDIR/shared $ROOTDIR/shared2
mkdir -p $ROOTDIR/shared2/usr
sudo mount --bind /usr $ROOTDIR/shared2/usr

echo "This directory should not be empty:"
ls $ROOTDIR/shared/usr

echo "Cleaning up"
sudo umount $ROOTDIR/shared2/usr
sudo rm -r $ROOTDIR/shared2/usr
sudo umount $ROOTDIR/shared2
sudo rm -r $ROOTDIR/shared2
sudo umount $ROOTDIR/shared

shared-mounts.sh

#!/usr/bin/env bash

ROOTDIR=$PWD

echo "Setting up"
mkdir -p $ROOTDIR/shared
sudo mount --bind $ROOTDIR/shared $ROOTDIR/shared
sudo mount --make-unbindable $ROOTDIR/shared
sudo mount --make-shared $ROOTDIR/shared

echo "Running docker container and mounting from inside it"
CTR=$(sudo docker run -t -d --privileged -v $ROOTDIR/shared:/shared ubuntu:12.04 /bin/bash -c 'mount --bind /usr /shared;sleep infinity')
sleep 1
echo "This directory should not be empty:"
ls $ROOTDIR/shared

echo "Cleaning up"
sudo umount $ROOTDIR/shared
sudo docker kill $CTR
sudo docker rm $CTR
sudo umount $ROOTDIR/shared
sudo rm -r $ROOTDIR/shared