#!/bin/bash
PATH=/usr/sbin:/usr/bin:/sbin:/bin

. /init_functions
# add sh symlink
ln -s /bin/bash /bin/sh

mount -t proc proc /proc -o nosuid,noexec,nodev
mount -t sysfs sys /sys -o nosuid,noexec,nodev

mount -t devtmpfs dev /dev -o mode=0755,nosuid
mount -t tmpfs run /run -o nosuid,nodev,mode=0755
mkdir -m755 /run/initramfs

# parse the kernel command line
parse_cmdline

# if available, start udevd at this stage
if [ -x /lib/udev/udevd ]; then
    msg ":: Starting udevd..."
    /lib/udev/udevd --daemon --resolve-names=never
    udevd_running=1
    msg "done."
else
    udevd_running=0
fi

for d in ${disablehooks//,/ }; do
    eval "hook_${d}=disabled"
done

earlymodules=${earlymodules//,/ }
if [ -n "${earlymodules## }" ]; then
    modprobe -qab ${earlymodules}
fi

. /config

[ -n "${MODULES## }" ] && modprobe -qab $MODULES

# If rootdelay is empty or not a non-negative integer, set it to 10
if [ -z "${rootdelay}" ] || ! [ ${rootdelay} -ge 0 ]; then
    rootdelay=10
fi

if [ -e "/hooks" ]; then
    for h in ${HOOKS}; do
        TST=""
        eval "TST=\$hook_${h}"
        if [ "${TST}" != "disabled" ]; then
            run_hook () { msg "${h}: no run function defined"; }
            if [ -e "/hooks/${h}" ]; then
               . /hooks/${h}
               msg ":: Running Hook [${h}]"
               run_hook
            fi
        fi
    done
fi

# honor the old behavior of break=y as a synonym for break=premount
if [ "${break}" = "y" ] || [ "${break}" = "premount" ]; then
    echo ":: Pre-mount break requested, type 'exit' to resume operation"
    launch_interactive_shell
fi

if [ "${root}" = "" -a "${ip}" = "" ]; then
    # enter install environment
    exec /sbin/init
else
    # Mount root at /new_root
    ${mount_handler:-default_mount_handler} /new_root

    init=${init:-/sbin/init}
    if [ "$(stat -c %D /)" = "$(stat -c %D /new_root)" ]; then
        # Nothing got mounted on /new_root. This is the end, we don't know what to do anymore
        # We fall back into a shell, but the shell has now PID 1
        # This way, manual recovery is still possible.
        err "Failed to mount the real root device."
        echo "Bailing out, you are on your own. Good luck."
        echo
        launch_interactive_shell --exec
    elif [ ! -x "/new_root${init}" ]; then
        # Successfully mounted /new_root, but ${init} is missing
        # The same logic as above applies
        err "Root device mounted successfully, but ${init} does not exist."
        echo "Bailing out, you are on your own. Good luck."
        echo
        launch_interactive_shell --exec
    fi

    # mount /usr if it exists
    if [ -f /new_root/etc/fstab ]; then
        if usr_source=$(findmnt -nero source -s/new_root/etc/fstab /usr); then
            mountopts=$(findmnt -nero options -s/new_root/etc/fstab /usr)
            fsck_device "$usr_source"
            mount "$usr_source" /new_root/usr -o "$mountopts"
        fi
    fi

    if [ "${break}" = "postmount" ]; then
        echo ":: Post-mount break requested, type 'exit' to resume operation"
        launch_interactive_shell
    fi

    # Stop udevd if is running
    if [ "${udevd_running}" -eq 1 ]; then
        udevadm control --exit
        udevadm info --cleanup-db
    fi

    exec env -i "TERM=$TERM" /sbin/switch_root /new_root $init "$@"
fi
