#!/bin/sh
#
# kas - setup tool for bitbake based projects
#
# Copyright (c) Siemens AG, 2018-2019
#
# Authors:
#  Jan Kiszka <jan.kiszka@siemens.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

set -e

usage()
{
	printf "%b" "Usage: $0 [OPTIONS] { build | shell } [KASOPTIONS] KASFILE\n"
	printf "%b" "       $0 [OPTIONS] clean\n"
	printf "%b" "\nPositional arguments:\n"
	printf "%b" "build\t\t\tCheck out repositories and build target.\n"
	printf "%b" "shell\t\t\tRun a shell in the build environment.\n"
	printf "%b" "clean\t\t\tClean build artifacts, keep downloads.\n"
	printf "%b" "\nOptional arguments:\n"
	printf "%b" "--isar\t\t\tUse kas-isar container to build Isar image.\n"
	printf "%b" "--with-loop-dev		Pass a loop device to the " \
		    "container. Only required if\n"
	printf "%b" "\t\t\tloop-mounting is used by recipes.\n"
	printf "%b" "--docker-args\t\tAdditional arguments to pass to docker " \
		    "for running the\n"
	printf "%b" "\t\t\tbuild.\n"
	printf "%b" "-v\t\t\tPrint operations.\n"
	printf "%b" "--ssh-dir\t\tDirectory containing SSH configurations.\n"
	printf "%b" "\t\t\tAvoid \$HOME/.ssh unless you fully trust the " \
		    "container.\n"
	printf "%b" "--aws-dir\t\tDirectory containing AWScli configuration.\n"
	printf "%b" "--no-proxy-from-env\tDo not inherit proxy settings from " \
		    "environment.\n"
	printf "%b" "\n"
	printf "%b" "You can force the use of podman over docker using " \
		    "KAS_DOCKER_ENGINE=podman.\n"
	exit 1
}

trace()
{
	[ -n "${VERBOSE}" ] && echo "+ $*"
	"$@"
}

if [ -z "${KAS_IMAGE_VERSION}" ]; then
	KAS_IMAGE_VERSION="2.1.1"
fi

DOCKER_IMAGE=kasproject/kas:${KAS_IMAGE_VERSION}

if [ -n "${KAS_WORK_DIR}" ]; then
	KAS_WORK_DIR=$(readlink -f "${KAS_WORK_DIR}")
else
	KAS_WORK_DIR="$(pwd)"
fi

if [ -z "${KAS_DOCKER_ENGINE}" ]; then
	# Try to auto-detect a docker engine
	if command -v docker >/dev/null; then
		KAS_DOCKER_ENGINE=docker
	elif command -v podman >/dev/null; then
		KAS_DOCKER_ENGINE=podman
	else
		echo "$0: no docker engine found, need docker or podman" >&2
		exit 1
	fi
fi

case "${KAS_DOCKER_ENGINE}" in
docker)
	DOCKER_COMMAND="docker"
	;;
podman)
	DOCKER_COMMAND="podman"
	DOCKER_IMAGE="docker://${DOCKER_IMAGE}"
	ENGINE_ARGS="--userns=keep-id --security-opt label=disable"
	;;
*)
	echo "$0: unknown docker engine '${KAS_DOCKER_ENGINE}'" >&2
	exit 1
	;;
esac

# parse kas-docker options
while [ $# -gt 0 ]; do
	case "$1" in
	--isar)
		DOCKER_IMAGE="$(echo "${DOCKER_IMAGE}" | sed 's|kasproject/kas|kasproject/kas-isar|g')"
		ISAR_ARGS="--privileged"

		case "${KAS_DOCKER_ENGINE}" in
		docker)
			ISAR_ARGS="${ISAR_ARGS} --cap-add=SYS_ADMIN"
			ISAR_ARGS="${ISAR_ARGS} --cap-add=MKNOD"
			;;
		podman)
			# sudo is needed for a privileged podman container
			DOCKER_COMMAND="sudo ${DOCKER_COMMAND}"
			;;
		esac

		shift 1
		;;
	--with-loop-dev)
		if ! LOOP_DEV=$(/sbin/losetup -f 2>/dev/null); then
			if [ "$(id -u)" -eq 0 ]; then
				echo "Error: loop device not available!"
				exit 1
			fi
			sudo_command="/sbin/losetup -f"
			sudo_message="[sudo] enter password to setup loop"
			sudo_message="$sudo_message devices by calling"
			sudo_message="$sudo_message '$sudo_command': " 
			if ! LOOP_DEV=$(sudo -p "$sudo_message" $sudo_command \
				2>/dev/null); then
				echo "Error: loop device setup unsuccessful!"
				echo "try calling '$sudo_command' with root" \
					"permissions manually."
				exit 1
			fi
		fi
		WITH_LOOP_DEV="--device ${LOOP_DEV}"
		shift 1
		;;
	--docker-args)
		[ $# -gt 0 ] || usage
		ENGINE_ARGS="${ENGINE_ARGS} $2"
		shift 2
		;;
	--ssh-dir)
		[ $# -gt 2 ] || usage
		SSH_DIR="$2"
		shift 2
		;;
	--aws-dir)
		[ $# -gt 2 ] || usage
		AWS_DIR="$2"
		shift 2
		;;
	--no-proxy-from-env)
		NO_PROXY_FROM_ENV=1
		shift 1
		;;
	-v)
		VERBOSE=1
		shift 1
		;;
	--*)
		usage
		;;
	clean)
		[ $# -eq 1 ] || usage
		CLEAN_DIR=build/tmp
		if [ -n "${ISAR_ARGS}" ]; then
			trace ${DOCKER_COMMAND} run -v "${KAS_WORK_DIR}":/work:rw \
					 --workdir=/work --rm ${ISAR_ARGS} \
					 ${DOCKER_IMAGE} \
					 sudo rm -rf ${CLEAN_DIR}
		else
			trace rm -rf "${KAS_WORK_DIR}/${CLEAN_DIR}"
		fi
		exit 0
		;;
	build|shell)
		CMD=$1
		shift 1
		break
		;;
	*)
		usage
		;;
	esac
done

[ -n "${CMD}" ] || usage

# parse kas sub-command (build or shell) options
while [ $# -gt 0 ]; do
	case "$1" in
	-h|--help)
		trace ${DOCKER_COMMAND} run ${DOCKER_IMAGE} ${CMD} --help
		exit 0
		;;
	--skip|--target|--task|-c|--cmd|--command)
		KAS_OPTIONS="${KAS_OPTIONS} $1 $2"
		shift 2
		;;
	--)
		# Ignore 'Assigning array to string' warning.
		# This needs to be fixed properly.
		# shellcheck disable=SC2124
		KAS_EXTRA_BITBAKE_ARGS="$@"
		shift $#
		;;
	-*)
		KAS_OPTIONS="${KAS_OPTIONS} $1"
		shift 1
		;;
	*)
		KAS_FILES=
		for FILE in $(IFS=':'; echo $1); do
			if ! REAL_FILE="$(realpath -qe "$FILE")"; then
				echo "Error: configuration file '${FILE}' not found"
				exit 1
			fi
			if [ -z "${KAS_FILES}" ]; then
				FIRST_KAS_FILE="${REAL_FILE}"
				KAS_FILES="${REAL_FILE}"
			else
				KAS_FILES="${KAS_FILES}:${REAL_FILE}"
			fi
		done
		shift 1
		;;
	esac
done

[ -n "${FIRST_KAS_FILE}" ] || usage

KAS_FILE_DIR="$(dirname "${FIRST_KAS_FILE}")"

REPO_DIR=$(git -C "${KAS_FILE_DIR}" rev-parse --show-toplevel 2>/dev/null) \
	|| REPO_DIR=$(hg --cwd "${KAS_FILE_DIR}" root 2>/dev/null) \
	|| REPO_DIR=${KAS_FILE_DIR}

KAS_FILES=/repo/"$(echo "${KAS_FILES}" | sed 's|'"${REPO_DIR}"'/||g;s|:|:/repo/|g')"

trace mkdir -p "${KAS_WORK_DIR}"

if [ "$(id -u)" -eq 0 ] && [ "${KAS_ALLOW_ROOT}" != "yes" ] ; then
	echo "Error: Running as root - may break certain recipes."
	echo "Better give a regular user docker access. Set" \
	     "KAS_ALLOW_ROOT=yes to override."
	exit 1
fi

set --  -v "${REPO_DIR}":/repo:ro \
	-v "${KAS_WORK_DIR}":/work:rw --workdir=/work \
	-e USER_ID="$(id -u)" -e GROUP_ID="$(id -g)" --rm

if [ -n "${SSH_DIR}" ] ; then
	if [ ! -d "${SSH_DIR}" ]; then
		echo "Passed SSH_DIR '${SSH_DIR}' is not a directory"
		exit 1
	fi
	set -- "$@" -v "$(readlink -f "${SSH_DIR}")":/etc/skel/.ssh:ro
fi

if [ -n "${AWS_DIR}" ] ; then
	if [ ! -d "${AWS_DIR}" ]; then
		echo "Passed AWS_DIR '${AWS_DIR}' is not a directory"
		exit 1
	fi
	set -- "$@" -v "$(readlink -f "${AWS_DIR}")":/etc/skel/.aws:ro \
		-e AWS_CONFIG_FILE="${AWS_CONFIG_FILE:-/etc/skel/.aws/config}" \
		-e AWS_SHARED_CREDENTIALS_FILE="${AWS_SHARED_CREDENTIALS_FILE:-/etc/skel/.aws/credentials}"
fi

if [ -t 1 ]; then
	set -- "$@" -t -i
fi

if [ -n "${DL_DIR}" ]; then
	trace mkdir -p "${DL_DIR}"
	set -- "$@" \
		-v "$(readlink -f "${DL_DIR}")":/downloads:rw \
		-e DL_DIR=/downloads
fi

if [ -n "${SSTATE_DIR}" ]; then
	trace mkdir -p "${SSTATE_DIR}"
	set -- "$@" \
		-v "$(readlink -f "${SSTATE_DIR}")":/sstate:rw \
		-e SSTATE_DIR=/sstate
fi

if [ -n "${KAS_REPO_REF_DIR}" ]; then
	set -- "$@" \
		-v "$(readlink -f "${KAS_REPO_REF_DIR}")":/repo-ref:ro \
		-e KAS_REPO_REF_DIR="${KAS_REPO_REF_DIR}"
fi

for var in TERM KAS_DISTRO KAS_MACHINE KAS_TARGET KAS_TASK \
           KAS_PREMIRRORS; do
	if [ -n "$(eval echo \$${var})" ]; then
		set -- "$@" -e "${var}=$(eval echo \"\$${var}\")"
	fi
done

# propagate only supported SHELL settings
case "$SHELL" in
/bin/sh|/bin/bash|/bin/dash)
	set -- "$@" -e "SHELL=$SHELL"
	;;
*)
	set -- "$@" -e "SHELL=/bin/bash"
	;;
esac

if [ -z "${NO_PROXY_FROM_ENV+x}" ]; then
	for var in http_proxy https_proxy ftp_proxy no_proxy NO_PROXY; do
		if [ -n "$(eval echo \$${var})" ]; then
			set -- "$@" -e "${var}=$(eval echo \$${var})"
		fi
	done
fi

trace ${DOCKER_COMMAND} run "$@" ${ISAR_ARGS} ${WITH_LOOP_DEV} ${ENGINE_ARGS} \
		 ${DOCKER_IMAGE} ${CMD} ${KAS_OPTIONS} ${KAS_FILES} \
		 ${KAS_EXTRA_BITBAKE_ARGS}