#!/bin/sh
# Copyright (C) 2011 O.S. Systems Software LTDA.
# Licensed on MIT
#
# Provides the API to be used by the initramfs modules
#
# Modules need to provide the following functions:
#
# <module>_enabled : check if the module ought to run (return 1 to skip)
# <module>_run     : do what is need
#
# Boot parameters are available on environment in the as:
#
# 'foo=value' as 'bootparam_foo=value'
# 'foo' as 'bootparam_foo=true'
# 'foo.bar[=value] as 'foo_bar=[value|true]'


# Load kernel module
load_kernel_module() {
	if modprobe $1 >/dev/null 2>&1; then
		info "Loaded module $1"
	else
		debug "Failed to load module $1"
	fi
}

# Prints information
msg() {
	echo "$@" >/dev/console
}

# Prints information if verbose bootparam is used
info() {
	[ -n "$bootparam_verbose" ] && echo "$@" >/dev/console
}

# Prints information if debug bootparam is used
debug() {
	[ -n "$bootparam_debug" ] && echo "DEBUG: $@" >/dev/console
}

# Prints a message and start a endless loop
fatal() {
    echo $1 >/dev/console
    echo >/dev/console

    if [ -n "$bootparam_init_fatal_sh" ]; then
        sh
    else
	while [ "true" ]; do
		sleep 3600
	done
    fi
}

# Variables shared amoung modules
EFI_DIR=/sys/firmware/efi  # place to store device firmware information

# make mount stop complaining about missing /etc/fstab
touch /etc/fstab

# initialize /proc, /sys, /run/lock and /var/lock
mkdir -p /proc /sys /run/lock /var/lock /var/run
mount -t proc proc /proc
mount -t sysfs sysfs /sys

if [ -d $EFI_DIR ];then
	mount -t efivarfs none /sys/firmware/efi/efivars
fi

# populate bootparam environment
for p in `cat /proc/cmdline`; do
	if [ -n "$quoted" ]; then
		value="$value $p"
		if [ "`echo $p | sed -e 's/\"$//'`" != "$p" ]; then
			eval "bootparam_${quoted}=${value}"
			unset quoted
		fi
		continue
	fi

	opt=`echo $p | cut -d'=' -f1`
	opt=`echo $opt | sed -e 'y/.-/__/'`
	if [ "`echo $p | cut -d'=' -f1`" = "$p" ]; then
		eval "bootparam_${opt}=true"
	else
		value="`echo $p | cut -d'=' -f2-`"
		if [ "`echo $value | sed -e 's/^\"//'`" != "$value" ]; then
			quoted=${opt}
			continue
		fi
		eval "bootparam_${opt}=\"${value}\""
	fi
done

# use /dev with devtmpfs
if grep -q devtmpfs /proc/filesystems; then
	mkdir -p /dev
	mount -t devtmpfs devtmpfs /dev
else
	if [ ! -d /dev ]; then
		fatal "ERROR: /dev doesn't exist and kernel doesn't has devtmpfs enabled."
	fi
fi
# run init in single user mode
exec /sbin/init -s

# Catch all
fatal "ERROR: Initramfs failed to initialize the system."