#!/bin/sh
export PATH=/bin:/sbin:/usr/bin:/usr/sbin

mount proc
for p in $(cat /proc/cmdline); do
  case $p in
    docker-root.switch_root)
      SWITCH_ROOT=true
      ;;
    docker-root.debug)
      DEBUG=true
      ;;
  esac
done
umount proc

if [ -n "${SWITCH_ROOT}" -a -z "$ROOT_SWITCHED" ]; then
  if mount -t tmpfs -o size=90% tmpfs /mnt; then
    if tar -C / --exclude=mnt -cf - . | tar -C /mnt/ -xf - ; then
      mkdir /mnt/mnt
      export ROOT_SWITCHED=true
      exec switch_root /mnt /init
    fi
  fi
fi

[ -z "${DEBUG}" ] && set -e

mount -t devtmpfs devtmpfs /dev

mkdir -p /var/log
syslogd
sleep 1
logger -s -p user.info -t "init[$$]" "Start init"

trap 'logger -s -p user.info -t "init[$$]" "trapped at line $LINENO"' ERR

mkdir -p /dev/pts

logger -s -p user.info -t "init[$$]" "Mounting system"
mount -t devpts devpts /dev/pts
mount -t proc proc /proc
mount -t tmpfs tmpfs /run
mount -t sysfs sysfs /sys
mount -t tmpfs cgroup /sys/fs/cgroup

for i in $(awk '!/^#/ { if ($4 == 1) print $1 }' /proc/cgroups); do
  mkdir -p /sys/fs/cgroup/$i
  mount -t cgroup -o $i cgroup /sys/fs/cgroup/$i
done

# Lock the root account
passwd -l root

# Setup consistent volumes
mkdir -p /var/lib/docker
mkdir -p /var/lib/docker-root

DEVICE=$(blkid | grep -e 'LABEL="DOCKERROOT-DATA"' | head -n 1 | sed 's/:.*//')
if [ -n "$DEVICE" ]; then
  PARTNAME=$(echo "$DEVICE" | sed 's/.*\///')
  logger -s -p user.info -t "init[$$]" "Mounting HDD /dev/$PARTNAME"
  mkdir -p /mnt/$PARTNAME
  if (! e2fsck -p /dev/$PARTNAME) || (! mount -t ext4 /dev/$PARTNAME /mnt/$PARTNAME); then
    logger -s -p user.info -t "init[$$]" "Running from memory, this won't be good..."
  else
    rm -rf /var/lib/docker
    mkdir -p /mnt/$PARTNAME/var/lib/docker
    ln -s /mnt/$PARTNAME/var/lib/docker /var/lib/docker

    rm -rf /var/lib/docker-root
    mkdir -p /mnt/$PARTNAME/var/lib/docker-root
    ln -s /mnt/$PARTNAME/var/lib/docker-root /var/lib/docker-root

    if [ ! -d /mnt/$PARTNAME/home ]; then
      mv /home /mnt/$PARTNAME/home
    else
      rm -rf /home
    fi
    ln -s /mnt/$PARTNAME/home /home

    rm -rf /opt
    mkdir -p /mnt/$PARTNAME/opt
    ln -s /mnt/$PARTNAME/opt /opt

    mkdir -p /mnt/$PARTNAME/etc
    mkdir -p /mnt/$PARTNAME/work/etc
    mount -t overlay overlay -o lowerdir=/etc,upperdir=/mnt/$PARTNAME/etc,workdir=/mnt/$PARTNAME/work/etc /etc
  fi
fi
DEVICE=$(blkid | grep -e 'LABEL="DOCKERROOT-SWAP"' | head -n 1 | sed 's/:.*//')
if [ -n "$DEVICE" ]; then
  logger -s -p user.info -t "init[$$]" "Enabling SWAP $DEVICE"
  if ! swapon $DEVICE; then
    logger -s -p user.info -t "init[$$]" "Could not make swap on $DEVICE"
  fi
fi

if [ -x /var/lib/docker-root/init.sh ]; then
  logger -s -p user.info -t "init[$$]" "Executing custom configuration in init.sh"
  /var/lib/docker-root/init.sh || true
fi

logger -s -p user.info -t "init[$$]" "Set hostname with /etc/hostname"
/bin/hostname -F /etc/hostname

logger -s -p user.info -t "init[$$]" "Executing ACPId"
/usr/sbin/acpid

logger -s -p user.info -t "init[$$]" "Executing startup scripts in /etc/init.d"
/etc/init.d/rcS

if [ -x /var/lib/docker-root/start.sh ]; then
  logger -s -p user.info -t "init[$$]" "Starting custom script start.sh"
  /var/lib/docker-root/start.sh &
fi

sync

logger -s -p user.info -t "init[$$]" "Starting console"
respawn /sbin/getty 38400 tty0 &
respawn /sbin/getty 38400 tty1 &
if dmesg | grep 'ttyS0 at I/O'; then
  respawn /sbin/getty -L 9600 ttyS0 vt100 &
fi
chvt 2

logger -s -p user.info -t "init[$$]" "Configuring sysctl"
sysctl -p /etc/sysctl.conf

logger -s -p user.info -t "init[$$]" "Starting Docker daemon"
/etc/init.d/docker start

set -mb
trap '' SIGCHLD
read