WhyCan Forum(哇酷开发者社区)

#!/bin/sh

/bin/busybox echo "start initramfs do any init"
/bin/busybox mount -t proc none /proc
/bin/busybox mount -t sysfs none /sys
/bin/busybox mount -t tmpfs none /dev
/bin/busybox mount -t tmpfs none /var
/bin/busybox mount -t tmpfs none /tmp

/bin/busybox mkdir -p /sys_root
/bin/busybox mdev -s

REAL_BOOTINIT=init
for arg in $(/bin/busybox cat /proc/cmdline); do
        case $arg in
                boot=*)
                REAL_ROOT="${arg#*=}"
                ;;
                bootfstype=*)
                REAL_ROOTTYPE="${arg#*=}"
                ;;
                bootinit=*)
                REAL_BOOTINIT="${arg#*=}"
                ;;
                bootinitarg=*)
                REAL_BOOTINIT_ARG="${arg#*=}"
                ;;
                bootinitunit=*)
                REAL_BOOTINIT_UNIT="${arg#*=}"
                ;;
        esac
done

if [ ! -z $REAL_ROOT ] && [ ! -z $REAL_ROOTTYPE ]; then
        /bin/busybox mount -t $REAL_ROOTTYPE $REAL_ROOT /sys_root
        if [ -e /sys_root/$REAL_BOOTINIT ]; then
                /bin/busybox mount --move /dev /sys_root/dev
                /bin/busybox mount --move /proc /sys_root/proc
                /bin/busybox mount --move /tmp /sys_root/tmp
                /bin/busybox mount --move /sys /sys_root/sys
                /bin/busybox mount --move /var /sys_root/var
                # exec /bin/busybox switch_root /sys_root $REAL_BOOTINIT $REAL_BOOTINIT_ARG $REAL_BOOTINIT_UNIT
                exec /bin/busybox switch_root /sys_root $REAL_BOOTINIT $REAL_BOOTINIT_ARG $REAL_BOOTINIT_UNIT
        fi
fi

/bin/busybox echo "switch root error!!!"
exec /bin/busybox init