#!/bin/bash

[ -z "$DEBUG" ] || set -x

# Make sure that we are sourced and called inside of RK build scripts.
if [ "$BASH_SOURCE" = "$0" -o -z "$RK_SESSION" ];then
	echo "$(realpath "$0") is not supposed to be executed directly"
	exit 1
fi

err_handler()
{
	ret=${1:-$?}
	[ "$ret" -eq 0 ] && return

	fatal "ERROR: Running $0 - ${2:-${FUNCNAME[1]}} failed!"
	fatal "ERROR: exit code $ret from line ${BASH_LINENO[0]}:"
	fatal "    ${3:-$BASH_COMMAND}"
	fatal "ERROR: call stack:"
	for i in $(seq 1 $((${#FUNCNAME[@]} - 1))); do
		SOURCE="${BASH_SOURCE[$i]}"
		LINE=${BASH_LINENO[$(( $i - 1 ))]}
		fatal "    $(basename "$SOURCE"): ${FUNCNAME[$i]}($LINE)"
	done
	exit $ret
}
trap 'err_handler' ERR
set -eE

usage()
{
	echo "Usage: $0 [OPTIONS]"
	usage_oneline "<rootfs dir> [<default os> [<default init>]]" \
		"process target dir"
	echo "    available init: sysv busybox systemd"
	usage_oneline "help" "display this information"
	exit 1
}

# Export global functions
set -a

install_sysv_service()
{
	[ "$POST_INIT_SYSV" ] || return 0

	SRC="$1"
	shift

	SERVICE="$(basename "$SRC" | sed 's~^S[0-9]*\(.*\)~\1~')"
	SERVICE_DIR="$TARGET_DIR/etc/init.d"

	install -D -m 0755 "$SRC" "$SERVICE_DIR/$SERVICE"

	SERVICE_PREFIX="$(echo $(basename "$SRC") | \
		grep -o "^S[0-9]*" || echo S99)"
	for level in $@; do
		case "$level" in
			S[0-9][0-9] | K[0-9][0-9]) SERVICE_PREFIX=$level ;;
			S | [0-6])
				LEVEL_DIR="$TARGET_DIR/etc/rc$level.d"
				LEVEL_SERVICE="$SERVICE_PREFIX$SERVICE"
				mkdir -p "$LEVEL_DIR"
				ln -rsf "$SERVICE_DIR/$SERVICE" \
					"$LEVEL_DIR/$LEVEL_SERVICE"
		esac
	done
}

install_busybox_service()
{
	[ "$POST_INIT_BUSYBOX" ] || return 0

	SRC="$1"
	SERVICE="$(basename "$SRC")"
	SERVICE_DIR="$TARGET_DIR/etc/init.d"

	install -D -m 0755 "$SRC" "$SERVICE_DIR/$SERVICE"
}

install_systemd_service()
{
	[ "$POST_INIT_SYSTEMD" ] || return 0

	SRC="$1"
	SERVICE="$(basename "$SRC")"
	SERVICE_DIR="$TARGET_DIR/lib/systemd/system"

	if [ "$2" ]; then
		install -D -m 0755 "$2" "$TARGET_DIR/${3:-/usr/bin/}"
	fi

	install -D -m 0644 "$SRC" "$SERVICE_DIR/$SERVICE"

	WANTED_BY="$(grep "^WantedBy=" "$SRC" | cut -d'=' -f2)"
	[ "$WANTED_BY" ] || return 0

	WANTS_DIR="$TARGET_DIR/etc/systemd/system/$WANTED_BY.wants"
	mkdir -p "$WANTS_DIR"
	ln -rsf "$SERVICE_DIR/$SERVICE" "$WANTS_DIR/$SERVICE"
}

set +a

case "$1" in
	usage | help | h | -h | --help | \?) usage ;;
esac

if [ ! -d "$1" ]; then
	error "$1 is not a dir!"
	usage
fi

TARGET_DIR=$(realpath "$1")
shift

unset POST_OS
case "$(grep "^ID=" "$TARGET_DIR/etc/os-release" 2>/dev/null || true)" in
	ID=buildroot) POST_OS=buildroot ;;
	ID=debian) POST_OS=debian ;;
	ID=poky) POST_OS=yocto ;;
esac
case "$TARGET_DIR/" in
	*/output/*_ramboot/target/*) POST_OS=ramboot ;;
	*/output/*_recovery/target/*) POST_OS=recovery ;;
esac
export POST_OS=${POST_OS:-unknown}

# Override OS type
case "$1" in
	buildroot|debian|yocto|ramboot|recovery|unknown)
		POST_OS="$1"
		shift
		;;
esac

echo "$POST_OS_DISALLOWED" | grep -wvq $POST_OS || exit 0

unset POST_ROOTFS
case "$POST_OS" in
	buildroot | debian | yocto) POST_ROOTFS=1 ;;
	*) [ -z "$POST_ROOTFS_ONLY" ] || exit 0 ;;
esac

unset POST_INIT
if [ -e "$TARGET_DIR/etc/init.d/rcS" ]; then
	if [ -d "$TARGET_DIR/etc/rcS.d" ]; then
		POST_INIT=sysv
	fi
	if grep -wq BusyBox "$TARGET_DIR/etc/inittab"; then
		POST_INIT="${POST_INIT:+$POST_INIT }busybox"
	fi
fi
if [ -d "$TARGET_DIR/etc/systemd/system/" ]; then
	mkdir -p "$TARGET_DIR/lib/systemd/system/"
	POST_INIT="${POST_INIT:+$POST_INIT }systemd"
fi
export POST_INIT="${POST_INIT:-none}"

# Override init type
case "$1" in
	sysv|busybox|systemd)
		POST_INIT="$1"
		shift
		;;
esac

unset POST_INIT_BUSYBOX POST_INIT_SYSTEMD POST_INIT_SYSV
for t in $POST_INIT; do
	case $t in
		sysv) export POST_INIT_SYSV=1 ;;
		busybox) export POST_INIT_BUSYBOX=1 ;;
		systemd) export POST_INIT_SYSTEMD=1 ;;
	esac
done

if basename "$(realpath "$0")" | grep -q "^post-"; then
	notice "Running $(basename "$0") for $TARGET_DIR ($POST_OS init=$POST_INIT)..."
	cd "$TARGET_DIR"
fi