#! /bin/ash
# Note this is used on legacy-flash boards that lack bash, it runs with busybox
# ash.  Calls to bash scripts must be guarded by checking config.

mknod /dev/ttyprintk c 5 3
echo "hello world" > /dev/ttyprintk

# Setup our path
export PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin

# This is the very first script invoked by the Linux kernel and is
# running out of the ram disk.  There are no fileysstems mounted.
# It is important to have a way to invoke a recovery shell in case
# the boot scripts are messed up, but also important to modify the
# PCRs if this happens to prevent the TPM disk keys from being revealed.

# First thing it is vital to mount the /dev and other system directories
mkdir /proc /sys /dev /tmp /boot /media 2>&- 1>&-
mount /dev 2>/dev/ttyprintk
mount /proc 2>/dev/ttyprintk
mount /sys 2>/dev/ttyprintk

if [ "$CONFIG_LINUXBOOT" = "y" ]; then
	mount /sys/firmware/efi/efivars
fi

# Setup the pty psudeo filesystem
mkdir /dev/pts
mount /dev/pts 2>/dev/ttyprintk

if [ ! -r /dev/ptmx ]; then
	ln -s /dev/pts/ptmx /dev/ptmx
fi

# Needed by bash
[ -e /dev/stdin ] || ln -s /proc/self/fd/0 /dev/stdin
[ -e /dev/stdout ] || ln -s /proc/self/fd/1 /dev/stdout
[ -e /dev/stderr ] || ln -s /proc/self/fd/2 /dev/stderr
[ -e /dev/fd ] || ln -s /proc/self/fd /dev/fd

# Recovery shells will erase anything from here
mkdir -p /tmp/secret

# Now it is safe to print a banner
if [ -r /etc/motd ]; then
	cat /etc/motd > /dev/tty0
fi

# Load the date from the hardware clock, setting it in local time
hwclock -l -s

# Read the system configuration parameters
. /etc/ash_functions
. /etc/config

TRACE "Under init"

# set CONFIG_TPM dynamically before init
if [ ! -e /dev/tpm0 ]; then
	CONFIG_TPM='n'
	CONFIG_TPM2_TOOLS='n'
	warn 'No TPM found...'
fi

#Specify whiptail background colors cues under FBWhiptail only
if [ -x /bin/fbwhiptail ]; then
	export BG_COLOR_WARNING="${CONFIG_WARNING_BG_COLOR:-"--background-gradient 0 0 0 150 125 0"}"
	export BG_COLOR_ERROR="${CONFIG_ERROR_BG_COLOR:-"--background-gradient 0 0 0 150 0 0"}"
else
	export BG_COLOR_WARNING="${CONFIG_WARNING_BG_COLOR:-""}"
	export BG_COLOR_ERROR="${CONFIG_ERROR_BG_COLOR:-""}"
fi

if [ "$CONFIG_TPM" = "y" ]; then
	# Initialize tpm2 encrypted sessions here
	tpmr startsession
fi

if [ "$CONFIG_COREBOOT" = "y" ]; then
	[ -x /bin/bash ] && /bin/cbfs-init
fi
if [ "$CONFIG_LINUXBOOT" = "y" ]; then
	/bin/uefi-init
fi

# Set GPG_TTY before calling gpg in key-init
export GPG_TTY=/dev/console

[ -x /bin/bash ] && /bin/key-init

# Setup recovery serial shell
if [ ! -z "$CONFIG_BOOT_RECOVERY_SERIAL" ]; then
	stty -F "$CONFIG_BOOT_RECOVERY_SERIAL" 115200
	pause_recovery 'Console recovery shell' \
		< "$CONFIG_BOOT_RECOVERY_SERIAL" \
		> "$CONFIG_BOOT_RECOVERY_SERIAL" 2>&1 &
fi

# load USB modules for boards using a USB keyboard
if [ "$CONFIG_USB_KEYBOARD" = "y" ]; then
	enable_usb
fi

# If the user has been holding down r, enter a recovery shell
# otherwise immediately start the configured boot script.
# We don't print a prompt, since this is a near instant timeout.
read \
	-t 0.1 \
	-n 1 \
	boot_option
echo

if [ "$boot_option" = "r" ]; then
	# Start an interactive shell
	recovery 'User requested recovery shell'
	# just in case...
	if [ "$CONFIG_TPM" = "y" ]; then
		tpmr extend -ix 4 -ic recovery
	fi
	exec /bin/sh
	exit
fi

# Override CONFIG_TPM and CONFIG_TPM2_TOOLS from /etc/config with runtime value
# determined above.
#
# Values in user config have higher priority during combining thus effectively
# changing the value for the rest of the scripts which source /tmp/config.
echo "export CONFIG_TPM=\"$CONFIG_TPM\"" >> /etc/config.user
echo "export CONFIG_TPM2_TOOLS=\"$CONFIG_TPM2_TOOLS\"" >> /etc/config.user

combine_configs
. /tmp/config

# export firmware version
export FW_VER=$(dmesg | grep 'DMI' | grep -o 'BIOS.*' | cut -f2- -d ' ')
# chop off date, since will always be epoch w/timeless builds
FW_VER=${FW_VER::-10}

# Add our boot devices into the /etc/fstab, if they are defined
# in the configuration file.
if [ ! -z "$CONFIG_BOOT_DEV" ]; then
	echo >> /etc/fstab "$CONFIG_BOOT_DEV /boot auto defaults,ro 0 0"
fi

if [ ! -x "$CONFIG_BOOTSCRIPT" -a ! -x "$CONFIG_BOOTSCRIPT_NETWORK" ]; then
	recovery 'Boot script missing?  Entering recovery shell'
else
	if [ -x "$CONFIG_BOOTSCRIPT_NETWORK" ]; then
		echo '***** Network Boot:' $CONFIG_BOOTSCRIPT_NETWORK
		$CONFIG_BOOTSCRIPT_NETWORK
		echo '***** Network Boot Completed:' $CONFIG_BOOTSCRIPT_NETWORK
		# not blocking
	fi

	if [ -x "$CONFIG_BOOTSCRIPT" ]; then
		echo '***** Normal boot:' $CONFIG_BOOTSCRIPT

		if [ -x /bin/setsid ] && [ -x /bin/agetty ]; then
			for console in $CONFIG_BOOT_EXTRA_TTYS; do
				setsid agetty -aroot -l"$CONFIG_BOOTSCRIPT" "$console" linux &
			done
		fi

		exec "$CONFIG_BOOTSCRIPT"

		# We should never reach here, but just in case...
		recovery 'Boot script failure?  Entering recovery shell'
	else
		# wait for boot via network to occur
		pause_recovery 'Override network boot. Entering recovery shell'
	fi
fi

# belts and suspenders, just in case...
if [ "$CONFIG_TPM" = "y" ]; then
	tpmr extend -ix 4 -ic recovery
fi
exec /bin/sh