udevd-experiment.sh

udevd-experiment.sh

#!/bin/bash

set -e

# Try with:
#     sudo $PWD/udevd-experiment.sh

THIS_SCRIPT=$0

if [ "$1" = "udevd1" ] ; then
  unshare --propagation unchanged -m $THIS_SCRIPT udevd2
  exit 0
fi

if [ "$1" = "udevd2" ] ; then
  mount --make-rslave /
  mount --make-rshared /
  sleep 5000
  exit 0
fi

$THIS_SCRIPT udevd1 &
sleep 1

DIR=/tmp/udevd-experiment-$RANDOM

mkdir $DIR
cd $DIR

mkdir rootfs
mount --bind / $DIR/rootfs

mount --make-rslave $DIR/rootfs
mount --make-rshared $DIR/rootfs

echo In the host namespace:
cat /proc/self/mountinfo|grep /tmp

echo In the udevd namespace:
cat /proc/$(pidof sleep)/mountinfo|grep /tmp

umount $DIR/rootfs

echo In the host namespace:
cat /proc/self/mountinfo|grep /tmp

echo In the udevd namespace:
cat /proc/$(pidof sleep)/mountinfo|grep /tmp