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#!/bin/sh
if [ $USER != 'root' ]; then
echo "This script needs root access"
exit 1
fi
# Mount resources
MOUNT_POINT=/usr/share/alpine-minirootfs
if ! grep -qs "$MOUNT_POINT/sys" /proc/mounts
then mount --rbind /sys $MOUNT_POINT/sys || exit 1
fi
if ! grep -qs "$MOUNT_POINT/dev" /proc/mounts
then
mount --rbind /dev $MOUNT_POINT/dev || exit 1
mount --make-rslave $MOUNT_POINT/dev || exit 1
fi
if ! grep -qs "$MOUNT_POINT/proc" /proc/mounts
then mount -t proc /proc $MOUNT_POINT/proc || exit 1
fi
# chroot exit signal pipe
if [ ! -e $MOUNT_POINT/exit.fifo ]
then mkfifo $MOUNT_POINT/exit.fifo
fi
# Function to monitor the named pipe for the exit signal from the internal script
monitor_chroot_exit() {
while read -r line
do
if [ "$line" == "exit" ]
then break
fi
done < $MOUNT_POINT/exit.fifo
if grep -qs "$MOUNT_POINT/sys" /proc/mounts
then umount -l $MOUNT_POINT/sys
fi
if grep -qs "$MOUNT_POINT/dev" /proc/mounts
then umount -l $MOUNT_POINT/dev
fi
if grep -qs "$MOUNT_POINT/proc" /proc/mounts
then umount -l $MOUNT_POINT/proc
fi
# Send a SIGTERM signal to the parent process (which is running the chroot command)
kill -s TERM $$
}
# Start the monitoring function in the background
monitor_chroot_exit &
# Enter the chroot environment in the foreground
export PATH=$PATH:/sbin:/usr/sbin:/bin:/usr/bin
chroot $MOUNT_POINT /bin/ash
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