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#!/bin/bash

PATH="${PATH}:/sbin:/usr/sbin"
GK_V='3.4.10.901'

# Set the default for TMPDIR.  May be modified by genkernel.conf or the
# --tempdir command line option.
TMPDIR='/var/tmp/genkernel'

TODEBUGCACHE=1 # Until an error occurs or LOGFILE is fully qualified.

small_die() {
  echo $1
  exit 1
}

parse_opt() {
	case "$1" in
		*\=*)
			echo "$1" | cut -f2- -d=
		;;
	esac
}

# We don't know where our config is, so we check for it, and default to using
# /etc/genkernel.conf if nobody has specified one.
case "$*" in
	--config=*)
		CMD_GK_CONFIG=`parse_opt "$*"`
	;;
esac

# Pull in our configuration
source ${CMD_GK_CONFIG:-/etc/genkernel.conf} || small_die "Could not read /etc/genkernel.conf"

# Start sourcing other scripts
source ${GK_SHARE}/gen_funcs.sh || small_die "Could not read ${GK_SHARE}/gen_funcs.sh"
source ${GK_SHARE}/gen_cmdline.sh || gen_die "Could not read ${GK_SHARE}/gen_cmdline.sh"
source ${GK_SHARE}/gen_arch.sh || gen_die "Could not read ${GK_SHARE}/gen_arch.sh"
source ${GK_SHARE}/gen_determineargs.sh || gen_die "Could not read ${GK_SHARE}/gen_determineargs.sh"
source ${GK_SHARE}/gen_compile.sh || gen_die "Could not read ${GK_SHARE}/gen_compile.sh"
source ${GK_SHARE}/gen_configkernel.sh || gen_die "Could not read ${GK_SHARE}/gen_configkernel.sh"
source ${GK_SHARE}/gen_initramfs.sh || gen_die "Could not read ${GK_SHARE}/gen_initramfs.sh"
source ${GK_SHARE}/gen_moddeps.sh || gen_die "Could not read ${GK_SHARE}/gen_moddeps.sh"
source ${GK_SHARE}/gen_package.sh || gen_die "Could not read ${GK_SHARE}/gen_package.sh"

TEMP=${TMPDIR}/$RANDOM.$RANDOM.$RANDOM.$$

trap_cleanup(){
	# Call exit code of 1 for failure
	cleanup
	exit 1
}

cleanup(){
    if [ -n "$TEMP" -a -d "$TEMP" ]; then
	rm -rf "$TEMP"
    fi

    if isTrue ${POSTCLEAR}
    then
	    echo
	    print_info 1 'RUNNING FINAL CACHE/TMP CLEANUP'
	    print_info 1 "CACHE_DIR: ${CACHE_DIR}"
	    CLEAR_CACHE_DIR='yes'
	    setup_cache_dir
	    echo
	    print_info 1 "TMPDIR: ${TMPDIR}"
	    clear_tmpdir
	    fi
}

trap trap_cleanup SIGHUP SIGQUIT SIGINT SIGTERM SIGKILL
BUILD_KERNEL=0
BUILD_RAMDISK=0
BUILD_MODULES=0

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

# Check if no action is specified...
if [ "${BUILD_KERNEL}" -eq '0' -a "${BUILD_RAMDISK}" -eq '0' ]
then
	usage
	exit 1
fi

clear_log
NORMAL=${GOOD} print_info 1 "Gentoo Linux Genkernel; Version ${GK_V}${NORMAL}"
print_info 1 "Running with options: ${Options}"
echo

# Set ${ARCH}
get_official_arch

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

# Merge modules_load from config
for group_modules in ${!AMODULES_*}; do
	group="$(echo $group_modules | cut -d_ -f2)"
	eval cmodules="\$$group_modules"
	eval MODULES_${group}=\"\${MODULES_${group}} ${cmodules}\"
	print_info 1 "<config> Merged AMODULES_${group}:'${cmodules}' into MODULES_${group}"
done


# Based on genkernel.conf, arch-specific configs, and commandline options,
# get the real arguments for usage...

determine_real_args

set_kernel_arch

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

setup_cache_dir

check_distfiles

dump_debugcache

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

if [ "${BUILD_RAMDISK}" -ne '0' ]
then
	if ! has_loop
	then
		modprobe loop 2>/dev/null
		sleep 3
		if ! has_loop
		then
			print_error 1 'The build-host kernel does not appear to have loop device support.'
			print_error 1 'Please load loop support before running genkernel!'
			gen_die 'Load loop support!'
		else
			print_info 1 'loop: "loop" module loaded successfully...'
		fi
	fi
fi

# Check BOOTDIR is mounted
if isTrue ${CMD_NOINSTALL}
then
	isTrue ${MOUNTBOOT} && print_info 2 'Skipping automatic mount of boot'
else
	[[ -d ${BOOTDIR} ]] || gen_die "${BOOTDIR} is not a directory"
	
	if ! egrep -q "[[:space:]]${BOOTDIR}[[:space:]]" /proc/mounts
	then
		if egrep -q "^[^#].+[[:space:]]${BOOTDIR}[[:space:]]" /etc/fstab
		then
			if isTrue ${MOUNTBOOT}
			then
				if ! mount ${BOOTDIR}
				then
					print_warning 1 "${BOLD}WARNING${NORMAL}: Failed to mount ${BOOTDIR}!"
					echo
				else
					print_info 1 "mount: ${BOOTDIR} mounted successfully!"
				fi
			else
				print_warning 1 "${BOLD}WARNING${NORMAL}: No mounted ${BOOTDIR} partition detected!"
				print_warning 1 "         Run ``mount ${BOOTDIR}`` to mount it!"
				echo
			fi
		fi
	elif isBootRO
	then
		if isTrue ${MOUNTBOOT}
		then
			if ! mount -o remount,rw ${BOOTDIR}
			then
				print_warning 1 "${BOLD}WARNING${NORMAL}: Failed to remount ${BOOTDIR} RW!"
				echo
			else
				print_info 1 "mount: ${BOOTDIR} remounted read/write successfully!"
				BOOTRW=1
			fi
		fi
	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/$$//; s/ /, /g"
#	echo 'halting...'
#	echo
#	print_warning 1 'Running multiple genkernels on the same source tree will cause data loss!'
#	print_info 1 "Press ^C to halt; ^D to continue [ ${BOLD}if${NORMAL} you know what you're doing! ]"
#	echo
#	CTEMP="${TEMP}"
#	TEMP=${TMPDIR-/tmp}
#	TEMP=${TEMP}/genkernel.$RANDOM.$RANDOM.$RANDOM.$$
#	print_info 1 'thread: Running multiple genkernels may cause problems!'
#	print_info 1 "thread: Temporary files reallocated to ${TEMP}..."
#	echo
#fi

KERNCACHE_IS_VALID=0
if [ "${KERNCACHE}" != "" ] 
then
    gen_kerncache_is_valid
fi

if [ ${BUILD_KERNEL} -eq '1' -a "${KERNCACHE_IS_VALID}" == "0" ]
then
	# Configure kernel
	config_kernel
	
	# Make prepare
	if [ "${ARCH_HAVENOPREPARE}" = '' ]
	then
		compile_generic prepare kernel
	fi
	
	# KV may have changed due to the configuration
	get_KV

	compile_kernel

	# Compile modules
	if [ ${BUILD_MODULES} -eq '1' -a ${BUILD_STATIC} -eq '0' ]
	then
		compile_modules
	fi

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

if ! isTrue "${CMD_NOINSTALL}"
then
	if [ "${KERNCACHE}" != "" -a "${KERNCACHE_IS_VALID}" != "0" ] 
	then
		gen_kerncache_extract_kernel
	fi
fi

if [ "${KERNCACHE}" != "" -a "${KERNCACHE_IS_VALID}" != "0" ] 
then
	[ ${BUILD_STATIC} -eq '0' ] && gen_kerncache_extract_modules
	gen_kerncache_extract_config
fi

# 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 ${LOGFILE}
		CMD_STATUS="${PIPESTATUS[0]}"
		echo
		print_info 1 "<<< Callback exit status: ${CMD_STATUS}"
		[ "${CMD_STATUS}" -ne 0 ] && gen_die '--callback failed!'
	else
		echo
		print_info 1 ">>> Callback cancelled..."
	fi
	trap - TERM KILL INT QUIT ABRT
	print_info 1 "" 1 0
fi

if [ "${BUILD_RAMDISK}" -eq '1' ]
then
	[ "${DISKLABEL}" -eq '1' ] && compile_e2fsprogs

	if [ "${BUSYBOX}" -eq '1' ]
	then
		# Compile Busybox
		compile_busybox
	fi

	compile_fuse
	compile_unionfs_fuse
    
	# Compile initramfs
	create_initramfs
else
	print_info 1 'initrd: Not building since only the kernel was requested...'
fi

if isTrue "${INTEGRATED_INITRAMFS}" #|| [ ${BUILD_KERNEL} -eq '1' -a "${KERNCACHE_IS_VALID}" == "0" ]
then
	# We build the kernel a second time to include the initramfs
	compile_kernel
fi

[ "${KERNCACHE}" != "" ] && gen_kerncache
[ "${MINKERNPACKAGE}" != '' ] && gen_minkernpackage
[ "${MODULESPACKAGE}" != '' ] && gen_modulespackage

# Clean up...
[ -n "${CTEMP}" ] && rm -rf "${TEMP}"

if [ "${BUILD_KERNEL}" -eq '1' ]
then
	print_info 1 ''
	print_info 1 "Kernel compiled successfully!"
	print_info 1 ''
	print_info 1 'Required Kernel Parameters:'
	if [ "${BUILD_RAMDISK}" -eq '0' ]
	then
		print_info 1 '    root=/dev/$ROOT'
		print_info 1 '    [ And "vga=0x317 splash=verbose" if you use a framebuffer ]'
		print_info 1 ''
		print_info 1 '    Where $ROOT is the device node for your root partition as the'
		print_info 1 '    one specified in /etc/fstab'
	else
		print_info 1 '    real_root=/dev/$ROOT'
		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 "If you require Genkernel's hardware detection features; you MUST"
		print_info 1 'tell your bootloader to use the provided INITRAMFS file. Otherwise;'
		print_info 1 'substitute the root argument for the real_root argument if you are'
		print_info 1 'not planning to use the initramfs...'
	fi
fi

if [ "${BUILD_RAMDISK}" -eq '1' ]
then
	echo
	print_info 1 'WARNING... WARNING... WARNING...'
	print_info 1 'Additional kernel cmdline arguments that *may* be required to boot properly...'
	[ "${SPLASH}" -eq '1' ] && print_info 1 "add \"vga=791 splash=silent,theme:${SPLASH_THEME} console=tty1 quiet\" if you use a splash framebuffer ]"
	[ "${LVM}" -eq '1' ] && print_info 1 'add "dolvm" for lvm support'
	[ "${EVMS}" -eq '1' ] && print_info 1 'add "doevms" for evms support'
	[ "${DMRAID}" -eq '1' ] && print_info 1 'add "dodmraid" for dmraid support'
	[ "${DMRAID}" -eq '1' ] && print_info 1 '	or "dodmraid=<additional options>"'
fi

[ "${BOOTRW}" != '' ] && mount -o remount,ro ${BOOTDIR}

echo
print_info 1 'Do NOT report kernel bugs as genkernel bugs unless your bug'
print_info 1 'is about the default genkernel configuration...'
print_info 1 ''
print_info 1 'Make sure you have the latest genkernel before reporting bugs.'

#Final Cleanup
cleanup