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|
#!/bin/sh
PATH=/sbin:/bin:/usr/sbin:/usr/bin
ROOT_MOUNT="/sysroot/"
ROOT_DEVICE=""
early_setup() {
mkdir -p /proc
mkdir -p /sys
mount -t proc proc /proc
mount -t sysfs sysfs /sys
mount -t devtmpfs none /dev
mkdir -p /run
mkdir -p /var/run
}
read_args() {
for arg in $(cat /proc/cmdline); do
value=$(echo ${arg} | cut -s -f2- -d '=')
case $arg in
root=*)
root=$value
;;
debugshell*)
if [ -z "$value" ]; then
shelltimeout=30
else
shelltimeout=$value
fi
;;
esac
done
if [ -z "$root" ] ; then
debug_shell "No root= specified via kernel command line."
else
case $root in
LABEL=*)
label=${root#LABEL=}
;;
*)
debug_shell "This init script only supports root=LABEL=* for specifying root file system, but root=$root was provided."
;;
esac
fi
}
mount_rootfs() {
mkdir -p $ROOT_MOUNT
mount $ROOT_DEVICE $ROOT_MOUNT
mount -n --move /proc $ROOT_MOUNT/proc
mount -n --move /sys $ROOT_MOUNT/sys
mount -n --move /dev $ROOT_MOUNT/dev
exec switch_root $ROOT_MOUNT /sbin/init || debug_shell "Couldn't switch_root."
}
switch_real_root() {
echo "Searching for media..."
C=0
while true
do
rootfs=$(findfs LABEL=$label)
if [ -n "$rootfs" ] ; then
ROOT_DEVICE=$rootfs
mount_rootfs
fi
# don't wait for more than $shelltimeout seconds, if it's set
if [ -n "$shelltimeout" ]; then
echo -n " " $(( $shelltimeout - $C ))
if [ $C -ge $shelltimeout ]; then
debug_shell "Cannot find root file system."
fi
C=$(( C + 1 ))
fi
sleep 1
done
}
debug_shell() {
echo ${1}
echo "Dropping to a shell."
exec sh
}
main() {
early_setup
read_args
if [ -f init-device ]; then
source init-device
fi
switch_real_root
}
main
|
