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#!/bin/busybox ash
# Install busybox's applets as symlinks
PATH=/usr/sbin:/usr/bin:/sbin:/bin
busybox --install -s
. /init_functions
mkdir -p /new_root
mount -t proc proc /proc -o nosuid,noexec,nodev
mount -t sysfs sys /sys -o nosuid,noexec,nodev
if grep -q devtmpfs /proc/filesystems 2>/dev/null; then
mount -n -t devtmpfs udev /dev -o mode=0755,size=10M,nosuid
devtmpfs_mounted=1
else
mount -n -t tmpfs udev /dev -o mode=0755,size=10M,nosuid
devtmpfs_mounted=0
# We don't have devtmpfs, so add the most important standard devices
mknod /dev/null c 1 3
mknod /dev/zero c 1 5
mknod /dev/console c 5 1
# /dev/mem is needed if we want to load uvesafb before triggering uevents
mknod /dev/mem c 1 1
fi
mount -t tmpfs run /run -o nosuid,noexec,nodev,mode=755,size=10M
echo "/sbin/modprobe" > /proc/sys/kernel/modprobe
# parse the kernel command line
parse_cmdline
# if available, start udevd at this stage
if [ -x /sbin/udevd ]; then
msg ":: Starting udevd..."
udevd --daemon --resolve-names=never
udevd_running=1
msg "done."
else
udevd_running=0
fi
if [ -n "${disablehooks}" ]; then
for d in $(echo "${disablehooks}" | sed 's|,| |g'); do
eval "hook_${d}=disabled"
done
fi
earlymodules=${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
# 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 ${init} does not exist."
echo "Bailing out, you are on your own. Good luck."
echo
launch_interactive_shell --exec
fi
if [ "${break}" = "postmount" ]; then
echo ":: Post-mount break requested, type 'exit' to resume operation"
launch_interactive_shell
fi
# Stop udevd if is running
if [ "${udevd_running}" -eq 1 ]; then
udevadm control --exit
udevadm info --cleanup-db
fi
for d in proc sys dev run; do
if [ -d /new_root/${d} ]; then
mount --move /${d} /new_root/${d}
else
umount /${d}
fi
done
exec env -i TERM=$TERM /sbin/switch_root -c /dev/console /new_root ${init} "$@"
# vim: set ft=sh ts=4 sw=4 et:
|
