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#!/bin/bash
# $Id$

PATH="${PATH}:/sbin:/usr/sbin"
GK_V='3.6.0.0'

# 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 "ERROR: $*" >&2
	exit 1
}

# 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.

# NOTE: We are look for --config=... in a way that doesn't modify $@ since we access that again, later
for arg in "$@"; do
	[[ "${arg}" == --config=* ]] && CMD_GK_CONFIG=${arg#--config=}
done

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

# set default LOGLEVEL if uninitialized
LOGLEVEL=${LOGLEVEL:-1}

# Start sourcing other scripts
source ${GK_SHARE}/defaults/software.sh || small_die "Could not read ${GK_SHARE}/defaults/software.sh"
source ${GK_SHARE}/defaults/config.sh || small_die "Could not read ${GK_SHARE}/defaults/config.sh"
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"
source ${GK_SHARE}/gen_bootloader.sh || gen_die "Could not read ${GK_SHARE}/gen_bootloader.sh"

if [ ! -d "${TMPDIR}" ]
then
	mkdir -p "${TMPDIR}" || gen_die "Failed to create '${TMPDIR}'!"
fi

TEMP=$(mktemp -d -p "${TMPDIR}" gk.XXXXXXXX 2>/dev/null)
[ -z "${TEMP}" ] && gen_die "mktemp failed!"

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

cleanup(){
	if isTrue "${CMD_DEBUGCLEANUP}"; then
		if [ -n "$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_CACHEDIR='yes'
			setup_cache_dir
			echo
			print_info 1 "TMPDIR: ${TMPDIR}"
			clear_tmpdir
		fi
	else
		print_info 1 "Not running any cleanup per DEBUGCLEANUP"
		print_info 1 "TEMP: ${TEMP}"
		print_info 1 "CACHE_DIR: ${CACHE_DIR}"
		print_info 1 "TMPDIR: ${TMPDIR}"
	fi
}

trap trap_cleanup SIGHUP SIGQUIT SIGINT SIGTERM SIGKILL
BUILD_KERNEL="no"
BUILD_RAMDISK="no"
BUILD_MODULES="no"

# 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 ! isTrue "${BUILD_KERNEL}" && ! isTrue "${BUILD_RAMDISK}"
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

print_info 1 "Using genkernel.conf from ${_GENKERNEL_CONF}"
# Save any customizations of MODULES_* first.
override_module_vars="$(compgen -A variable |grep '^MODULES_')"
for v in $override_module_vars ; do
	print_info 1 "Saving $v to override defaults"
	newvar=override_$v
	eval "${newvar}='${!v}'"
done

# Read arch-specific config
print_info 1 "Sourcing arch-specific config.sh from ${ARCH_CONFIG} .."
source ${ARCH_CONFIG} || gen_die "Could not read ${ARCH_CONFIG}"
_MODULES_LOAD=${GK_SHARE}/arch/${ARCH}/modules_load
print_info 1 "Sourcing arch-specific modules_load from ${_MODULES_LOAD} .."
source "${_MODULES_LOAD}" || gen_die "Could not read ${_MODULES_LOAD}"

# Now apply customizations of MODULES_*
for v in $override_module_vars; do
	newvar=override_$v
	print_info 1 "Override $v, default (${!v}), new value (${!newvar})"
	eval "${v}='${!newvar}'"
done

# Merge additional 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

determine_KV
# $KV is now either set to the version from previous compilation,
# which would include LOCALVERSION suffix, or initialized with
# unmodified KERNEL_SOURCE version (which normally has no LOCALVERSION set).

determine_config_file

set_kernel_arch

setup_cache_dir

check_distfiles

dump_debugcache

KERNCACHE_IS_VALID="no"
if [ "${KERNCACHE}" != "" ]
then
	gen_kerncache_is_valid
fi

NORMAL=${BOLD} print_info 1 "Linux Kernel ${BOLD}${KV}${NORMAL} for ${BOLD}${ARCH}${NORMAL}..."
print_info 1 ".. with config file ${KERNEL_CONFIG}"

if isTrue "${BUILD_KERNEL}" && ! isTrue "${KERNCACHE_IS_VALID}"
then
	print_info 1 ""
	print_info 1 "Note: The version above is subject to change (depends on config and status of kernel sources)."
	print_info 1 ""
fi


# Check if BOOTDIR is mounted
if ! isTrue "${CMD_INSTALL}"
then
	isTrue "${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 ${BOOTDIR} partition detected!"
				print_warning 1 "$(getIndent 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="yes"
			fi
		fi
	fi
fi

if isTrue "${BUILD_KERNEL}" && ! isTrue "${KERNCACHE_IS_VALID}"
then
	# Configure kernel
	config_kernel

	# Make prepare
	if ! isTrue "${ARCH_HAVENOPREPARE}"
	then
		compile_generic prepare kernel
	else
		print_info 2 "$(getIndent 1)>> Skipping 'make prepare' due to ARCH_HAVENOPREPARE=yes!"
	fi

	# KV may have changed due to the configuration
	determine_KV
	if [ -f "${TEMP}/.old_kv" ]
	then
		old_KV=$(cat "${TEMP}/.old_kv")
		print_info 1 "$(getIndent 1)>> Kernel version has changed (probably due to config change) since genkernel start:"
		print_info 1 "$(getIndent 1)>> We are now building Linux kernel ${BOLD}${KV}${NORMAL} for ${BOLD}${ARCH}${NORMAL}..."
	else
		print_info 2 "$(getIndent 1)>> Kernel version has not changed since genkernel start."
	fi

	compile_kernel

	# Compile modules
	if isTrue "${BUILD_MODULES}" && ! isTrue "${BUILD_STATIC}"
	then
		compile_modules
	fi

	if isTrue "${SAVE_CONFIG}"
	then
		print_info 1 "Copying config for successful build to /etc/kernels/kernel-config-${ARCH}-${KV}"
		[ ! -e '/etc/kernels' ] && mkdir -p /etc/kernels
		cp "${KERNEL_OUTPUTDIR}/.config" "/etc/kernels/kernel-config-${ARCH}-${KV}" || \
			print_warning "Unable to copy the kernel configuration file."
			# Just a warning because ordinary users are not allowed to write in /etc
	fi
fi

if isTrue "${CMD_INSTALL}"
then
	if [ "${KERNCACHE}" != "" ] && isTrue "${KERNCACHE_IS_VALID}"
	then
		gen_kerncache_extract_kernel
	fi
fi

if [ "${KERNCACHE}" != "" ] && isTrue "${KERNCACHE_IS_VALID}"
then
	! isTrue "${BUILD_STATIC}" && 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}" = '0' && ${CALLBACK_COUNT} -lt 5 ]]
	do
		sleep 1; printf '.';
		let CALLBACK_COUNT=${CALLBACK_COUNT}+1
	done

	if [ "${CALLBACK_ESCAPE}" = '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}" != '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 isTrue "${BUILD_RAMDISK}"
then
	# Compile initramfs
	create_initramfs
else
	print_info 1 'initramfs: Not building since only the kernel was requested...'
fi

if isTrue "${INTEGRATED_INITRAMFS}"
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 isTrue "${BUILD_KERNEL}"
then
	if isTrue "${CMD_INSTALL}"
	then
		set_bootloader
	fi
	print_info 1 ''
	print_info 1 "Kernel compiled successfully!"
	print_info 1 ''
	print_info 1 'Required Kernel Parameters:'
	print_info 1 '    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.'
fi

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

	if isTrue "{ZFS}"
	then
		print_warning 1 'add "dozfs" for ZFS volume management support'
		print_warning 1 '	and either "root=ZFS" to use bootfs autodetection or "root=ZFS=<dataset>" to force booting from a specific dataset'
		print_warning 1 ''
		if [ -f "${TEMP}/.embedded_hostid" ]
		then
			local _hostid=$(cat "${TEMP}/.embedded_hostid")
			print_warning '1' "Hostid '${_hostid}' is embedded into initramfs."
			print_warning '1' "If you will use this initramfs for a different system you MUST set 'spl_hostid=<hostid>' parameter to overwrite embedded hostid!"
		else
			print_warning '1' "No hostid embedded into initramfs. You MUST set 'spl_hostid=<hostid>' parameter to provide hostid for ZFS!"
		fi
		print_warning 1 ''
		print_warning 1 'If importing ZFS pool is slow, add dozfs=cache or dozfs=force to kernel commandline.'
		print_warning 1 '"man genkernel" explains "dozfs" in detail.'
	fi

	isTrue "${BTRFS}"  && print_warning 1 'add "dobtrfs" for Btrfs device scanning support'
	isTrue "${ISCSI}"  && print_warning 1 'add at least "iscsi_initiatorname=<initiator name> iscsi_target=<target name> and iscsi_address=<target ip>" for iscsi support'

	if [[ "$(file --brief --mime-type "${KERNEL_CONFIG}")" == application/x-gzip ]]; then
		# Support --kernel-config=/proc/config.gz, mainly
		CONFGREP=zgrep
	else
		CONFGREP=grep
	fi

	if [ `${CONFGREP} 'CONFIG_EXT[0-9]_FS=' "${KERNEL_CONFIG}" | wc -l` -ge 2 ]; then
		print_warning 1 'With support for several ext* filesystems available, it may be needed to'
		print_warning 1 'add "rootfstype=ext3" or "rootfstype=ext4" to the list of boot parameters.'
	fi

	unset CONFGREP
fi

isTrue "${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 ~arch genkernel before reporting bugs.'

#Final Cleanup
cleanup