copy-files.sh

#!/usr/bin/env bash

usage() {
	local old_xtrace
	old_xtrace="$(shopt -po xtrace || :)"
	set +o xtrace
	echo "${script_name} - Copy ILP32 base files." >&2
	echo "Usage: ${script_name} [flags] <file-type>" >&2
	echo "Option flags:" >&2
	echo "  -c --check   - Run shellcheck." >&2
	echo "  -h --help    - Show this help and exit." >&2
	echo "  -v --verbose - Verbose execution." >&2
	echo "  -f --force   - Overwrite files without prompting." >&2
	echo "Args:" >&2
	echo "  <file-type>  - File type {${file_types} all}." >&2
	echo "                 Default: '${file_type}'." >&2
	eval "${old_xtrace}"
}

process_opts() {
	local short_opts="chvf"
	local long_opts="check,help,verbose,force"

	local opts
	opts=$(getopt --options ${short_opts} --long ${long_opts} -n "${script_name}" -- "$@")

	eval set -- "${opts}"

	while true ; do
		case "${1}" in
		-c | --check)
			check=1
			shift
			;;
		-h | --help)
			usage=1
			shift
			;;
		-v | --verbose)
			#verbose=1
			set -x
			shift
			;;
		-f | --force)
			force=1
			shift
			;;
		--)
			file_type=${2}
			if [[ ${usage} || ${check} ]]; then
				break
			fi
			if ! shift 2; then
				echo "${script_name}: ERROR: Missing args: <file-type>" >&2
				usage
				exit 1
			fi
			if [[ -n "${1}" ]]; then
				echo "${script_name}: ERROR: Got extra args: '${*}'" >&2
				usage
				exit 1
			fi
			break
			;;
		*)
			echo "${script_name}: ERROR: Internal opts: '${*}'" >&2
			exit 1
			;;
		esac
	done
}

on_exit() {
	local result=${1}

	set +x
	echo "${script_name}: Done: ${result}" >&2
}

run_shellcheck() {
	local file=${1}

	shellcheck=${shellcheck:-"shellcheck"}

	if ! test -x "$(command -v "${shellcheck}")"; then
		echo "${script_name}: ERROR: Please install '${shellcheck}'." >&2
		exit 1
	fi

	${shellcheck} "${file}"
}

copy_files() {
	local type=${1}
	local no_force

	if [[ ! ${force} ]]; then
		no_force=1
	fi

	case "${type}" in
	binfmt)
		cp -v ${no_force:+-i} \
			"${SCRIPTS_TOP}/fs/compat_binfmt_elf.c" \
			"${SCRIPTS_TOP}/fs/binfmt_arm64_ilp32_elf.c"
		;;
	signal)
		cp -v ${no_force:+-i} \
			"${SCRIPTS_TOP}/arch/arm64/kernel/signal.c" \
			"${SCRIPTS_TOP}/arch/arm64/kernel/signal_ilp32.c"
		;;
	syscall)
		cp -v ${no_force:+-i} \
			"${SCRIPTS_TOP}/arch/arm64/kernel/sys32.c" \
			"${SCRIPTS_TOP}/arch/arm64/kernel/sys_ilp32.c"
		;;
	vdso)
		mkdir -p "${SCRIPTS_TOP}/arch/arm64/kernel/vdso_ilp32"

		cp -v ${no_force:+-i} \
			"${SCRIPTS_TOP}/arch/arm64/kernel/vdso/gen_vdso_offsets.sh" \
			"${SCRIPTS_TOP}/arch/arm64/kernel/vdso/Makefile" \
			"${SCRIPTS_TOP}/arch/arm64/kernel/vdso/sigreturn.S" \
			"${SCRIPTS_TOP}/arch/arm64/kernel/vdso/vdso.lds.S" \
			"${SCRIPTS_TOP}/arch/arm64/kernel/vdso/vdso.S" \
			"${SCRIPTS_TOP}/arch/arm64/kernel/vdso/vgettimeofday.c" \
			"${SCRIPTS_TOP}/arch/arm64/kernel/vdso32/note.c" \
			"${SCRIPTS_TOP}/arch/arm64/kernel/vdso_ilp32/"
		;;
	*)
		echo "${script_name}: ERROR: Unknown <file-type> '${type}'" >&2
		usage
		exit 1
		;;
	esac
}

#===============================================================================
# program start
#===============================================================================

export PS4='\[\033[0;33m\]+ ${BASH_SOURCE##*/}:${LINENO}:(${FUNCNAME[0]:-"?"}): \[\033[0;37m\]'
script_name="${0##*/}"

SCRIPTS_TOP=${SCRIPTS_TOP:-"$(cd "${0%/*}" && pwd)"}

trap "on_exit 'failed.'" EXIT
set -e

file_types="binfmt signal syscall vdso"

process_opts "${@}"

if [[ ${usage} ]]; then
	usage
	trap - EXIT
	exit 0
fi

if [[ ${check} ]]; then
	run_shellcheck "${0}"
	trap "on_exit 'Success'" EXIT
	exit 0
fi

if [[ "${file_type}" == "all" ]]; then
	for ft in ${file_types}; do
		copy_files "${ft}"
	done
else
	copy_files "${file_type}"
fi

trap "on_exit 'Success.'" EXIT
exit 0