51 lines
1.2 KiB
Plaintext
51 lines
1.2 KiB
Plaintext
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#!/bin/busybox sh
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cmdline() {
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local value
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value=" $(cat /proc/cmdline) "
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value="${value##* ${1}=}"
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value="${value%% *}"
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[ "${value}" != "" ] && echo "${value}"
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}
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rootpartuuid() {
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local value
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value=$1
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value="${value%/*}"
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value="${value#*=}"
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[ "${value}" != "" ] && echo "${value}"
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}
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# mount the bare necesities
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mount -n -t proc proc /proc
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mount -n -t sysfs sysfs /sys
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mount -n -t devtmpfs devtmpfs /dev
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mount -n -t tmpfs tmpfs /run
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# get the root device, so we can find the boot partiton
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UNPARSED=$(cmdline root)
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ROOT_PARTUUID=$(rootpartuuid $UNPARSED)
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echo ${ROOT_PARTUUID}
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BLKID=$(/bin/blkid | grep $ROOT_PARTUUID )
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echo ${BLKID}
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#If its an mmcblk device, the partiton will p1. If it is a usb device, the partiton will just be 1
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#Just want everything before the 1: so this will work
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ROOT_DEV="${BLKID%1:*}"
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echo ${ROOT_DEV}
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# we use this to change what cmdline options get passed into
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# the next boot stage, aka to enable root encryption
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CMDLINE='cat /proc/cmdline'
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# mount new root
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[ -d /newroot ] || mkdir -p /newroot
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mount ${ROOT_DEV}3 /newroot
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umount /sys
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umount /proc
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#swith to the new rootfs
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exec swith_root /newroot "/sbin/init" ${CMDLINE}
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