104 lines
3.5 KiB
Plaintext
104 lines
3.5 KiB
Plaintext
#!/bin/busybox sh
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# This is the init script built into the PrawnOS initramfs
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# This file is part of PrawnOS (https://www.prawnos.com)
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# Copyright (c) 2018 Hal Emmerich <hal@halemmerich.com>
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# PrawnOS is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2
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# as published by the Free Software Foundation.
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# PrawnOS is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with PrawnOS. If not, see <https://www.gnu.org/licenses/>.
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echo In PrawnOS Init
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#add this to start shell at desired point
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rescue_shell() {
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[ "{$1}" != "debug" ] && echo "Something went wrong. Dropping to a shell." > /dev/tty1
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[ "{$1}" == "debug" ] && echo "Debug flag detected, entering debug shell" > /dev/tty1
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echo "Something went wrong. Dropping to a shell." > /dev/tty1
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exec setsid /bin/sh -c 'exec /bin/sh </dev/tty1 >/dev/tty1 2>&1'
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}
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#used to parse the kernel cmdline
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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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#used to get the uuid of the root partiton since findfs isn't in debian busybox-static
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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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# a clever portable shell script to detect occurances of a substring in a string
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# occur <string> <substring> (optional count)
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# if optional count is not provided:
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# returns 1 if substring is not in string
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# returns 0 otherwise
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# if optional count is provided:
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# returns 1 if substring occurs in string < optional count
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# returns 0 otherwise
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occur() while case "$1" in (*"$2"*) set -- \
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"${1#*"$2"}" "$2" "${3:-0}" "$((${4:-0}+1))";;
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(*) return "$((${4:-0}<${3:-1}))";;esac
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do : "${_occur:+$((_occur=$4))}";done
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# mount the bare necesities
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mount -n -t proc proc /proc
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mount -n -t sysfs sysfs /sys
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mount -n -t devtmpfs devtmpfs /dev
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# get the root device, so we can find the boot partiton
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UNPARSED=$(cmdline root)
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ROOT_PARTUUID=$(rootpartuuid $UNPARSED)
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echo ${ROOT_PARTUUID} > /dev/tty1
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BLKID=$(/bin/blkid | grep $ROOT_PARTUUID )
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echo ${BLKID} > /dev/tty1
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#If its an mmcblk device, the kernel partiton will p1. If it is a usb device, the partiton will just be 1
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#Just want everything before the 1
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ROOT_DEV="${BLKID%1:*}"
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echo ${ROOT_DEV} > /dev/tty1
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# label any partition on the system with RESCUESHELL to enter the initramfs rescue shell before mount and root_switch.
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# you can do this with "cgpt add -i 1 -l RESCUESHELL /dev/sda" for example to label the first partiton of a usb drive.
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if [ -n "$(blkid | grep RESCUESHELL)" ]
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then
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rescue_shell debug
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fi
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if [ -n "$(blkid ${ROOT_DEV}2 | grep crypto_LUKS)" ]
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then
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#decrypt and mount the root filesystem, disable kernel log messages to avoid clashing with the prompt
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dmesg -n 2
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echo "Opening encrypted root partition, this will take 30s..."
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cryptsetup --tries 5 luksOpen ${ROOT_DEV}2 luksroot || rescue_shell
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dmesg -n 7
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mount /dev/mapper/luksroot /newroot
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else
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# mount the unencrypted root filesystem
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[ -d "/newroot" ] || mkdir -p /newroot
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mount ${ROOT_DEV}2 /newroot
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fi
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umount /sys
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umount /proc
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#switch to the new rootfs
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exec switch_root /newroot /sbin/init
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