#!/bin/bash
# Genkernel v3

GK_V="3.0.2"
TEMP="/var/tmp/genkernel"

small_die() {
  echo $1
  exit 1
}

source /etc/genkernel.conf || small_die "could not read /etc/genkernel.conf"
source ${GK_BIN}/gen_funcs.sh || small_die "could not read ${GK_BIN}/gen_funcs.sh"
clear_log
source ${GK_BIN}/gen_cmdline.sh || gen_die "could not read ${GK_BIN}/gen_cmdline.sh"
source ${GK_BIN}/gen_arch.sh || gen_die "could not read ${GK_BIN}/gen_arch.sh"
source ${GK_BIN}/gen_determineargs.sh || gen_die "could not read ${GK_BIN}/gen_determineargs.sh"
source ${GK_BIN}/gen_compile.sh || gen_die "could not read ${GK_BIN}/gen_compile.sh"
source ${GK_BIN}/gen_configkernel.sh || gen_die "could not read ${GK_BIN}/gen_configkernel.sh"
source ${GK_BIN}/gen_initrd.sh || gen_die "could not read ${GK_BIN}/gen_initrd.sh"
source ${GK_BIN}/gen_moddeps.sh || gen_die "could not read ${GK_BIN}/gen_moddeps.sh"
source ${GK_BIN}/gen_package.sh || gen_die "could not read ${GK_BIN}/gen_package.sh"

BUILD_ALL=0
BUILD_KERNEL=0
BUILD_INITRD=0

# Parse all command line options...
while [ $# -gt 0 ]
do
	Option=$1; shift
	parse_cmdline $Option
done

if [ "${BUILD_ALL}" -eq 0 -a "${BUILD_KERNEL}" -eq 0 -a "${BUILD_INITRD}" -eq 0 ]
then
	usage
	exit 1
fi

NORMAL=${GOOD} print_info 1 "Gentoo Linux Genkernel; Version ${GK_V}"

# Set ${ARCH}
get_official_arch

# Read arch-specific config
source ${ARCH_CONFIG} || gen_die "could not read ${ARCH_CONFIG}"
source ${GK_SHARE}/${ARCH}/modules_load || gen_die "could not read ${GK_SHARE}/${ARCH}/modules_load"

[ ! -f "${TEMP}" ] && mkdir -p "${TEMP}"

# Based on genkernel.conf, arch-specific configs, and commandline options,
# get the real args for use.
determine_real_args

NORMAL=${BOLD} print_info 1 "Compiling Linux Kernel ${WARN}${KV}${BOLD} for ${WARN}${ARCH}${BOLD}..."
echo

if ! has_loop
then
	print_error print_info 1 "Your kernel does not appear to have loop device support. "
	print_error print_info 1 "Please 'modprobe loop' if it is a module before running genkernel"
	gen_die "Load loop support!"
fi

# Check /boot is mounted
if ! grep -q "/boot" /proc/mounts
then
	if isTrue ${MOUNTBOOT}
	then
		if ! mount /boot
		then
			print_warning 1 "${BOLD}WARNING${NORMAL}: Failed to mount /boot!"
			echo
		fi
	else
		print_warning 1 "${BOLD}WARNING${NORMAL}: No mounted /boot partition detected!"
		print_warning 1 '         Run ``mount /boot`` to mount it!'
		echo
	fi
fi

# Check whether another Genkernel is running
GENPIDS="`ps -C genkernel --no-headers -o pid | wc -l`"
if [ "${GENPIDS}" -gt "3" ]
then
	[ "${GENPIDS}" -gt "4" ] && EX='s'
	print_warning 1 "${BOLD}WARNING${NORMAL}: Another Genkernel instance is running under"
	print_warning 1 "         process ID${EX} " 0
	GENPIDS=`ps -C genkernel --no-headers -o pid`
	echo -n ${GENPIDS} | sed -e "s/$$//; s/ /, /g"
	echo "halting..."
	echo
	print_warning 1 "Running multiple genkernels on the same source tree will cause data loss!"
	print_info 1 "Press ^C to halt; ^D to continue [ ${BOLD}if${NORMAL} you know what you're doing! ]"
	cat
	echo
	TEMP="/var/tmp/genkernel-`date | md5sum | cut -d\  -f1`"
	print_info 1 "thread: Running multiple genkernels may cause problems!"
	print_info 1 "thread: Temporary files reallocated to ${TEMP}..."
	echo
fi

# Configure kernel
config_kernel

# Make deps
compile_dep

# Compile kernel
compile_kernel

# Compile modules
compile_modules

print_info 1 "Copying config for successful build to /etc/kernels/kernel-config-${ARCH}-${KV}"
[ ! -e "/etc/kernels" ] && mkdir -p /etc/kernels
cp "${KERNEL_DIR}/.config" "/etc/kernels/kernel-config-${ARCH}-${KV}"

# Run callback
if [ "${CMD_CALLBACK}" != "" ]
then
	print_info 1 "" 1 0
	print_info 1 "Preparing to run callback: \"${CMD_CALLBACK}\"" 0

	CALLBACK_ESCAPE=0
	CALLBACK_COUNT=0

	trap "CALLBACK_ESCAPE=1" TERM KILL INT QUIT ABRT
	while [[ ${CALLBACK_ESCAPE} -eq 0 && ${CALLBACK_COUNT} -lt 5 ]]
	do
		sleep 1; echo -n '.';
		let CALLBACK_COUNT=${CALLBACK_COUNT}+1
	done

	if [ "${CALLBACK_ESCAPE}" -eq 0 ]
	then
		echo
		echo
		eval ${CMD_CALLBACK} | tee -a ${DEBUGFILE}
		echo
		print_info 1 "<<< Callback exit status: $?"
	else
		echo
		print_info 1 ">>> Callback cancelled..."
	fi
	trap - TERM KILL INT QUIT ABRT
	print_info 1 "" 1 0
fi

# Compile dietlibc
if [ "${USE_DIETLIBC}" = "1" ]
then
	compile_dietlibc
fi

# Compile Busybox
compile_busybox

# Only compile insmod if we're installing modules onto the initrd
if [ "${NOINITRDMODULES}" = "" ]
then
	if [ "${PAT}" -gt "4" ]
	then
		# Compile module-init-tools
		compile_module_init_tools
	else
		compile_modutils
	fi
fi

compile_devfsd

# Create initrd
create_initrd

if [ "${MINKERNPACKAGE}" != "" ]
then
	gen_minkernpackage
fi

print_info 1 ''
print_info 1 "Kernel compiled successfully!"
print_info 1 ''
print_info 1 "Required Kernel Parameters:"
print_info 1 '    root=/dev/ram0 real_root=/dev/$ROOT init=/linuxrc'
print_info 1 '    [ And "vga=0x317 splash=verbose" if you use a framebuffer ]'
print_info 1 ''
print_info 1 '    Where $ROOT is the device node for your root partition as the'
print_info 1 '    one specified in /etc/fstab'
print_info 1 ''
print_info 1 "You MUST also tell your bootloader to use the generated initrd."
print_info 1 ''
print_info 1 "Do NOT report kernel bugs (configs included) as genkernel bugs."
print_info 1 "Make sure you have the latest genkernel before reporting bugs."
print_info 1 ""
print_info 1 "For more information please see /usr/share/genkernel/README..."