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#!/bin/sh

set -e

TPL_PKGS='build-essential'

main()
{
	case "${1}" in
		'clean')
			clean
			;;
		'')
			if [ -z "${PKG_TARGETS}" ]; then
				PKG_TARGETS="$(cat targets.in)"
			fi
			for arch in ${PKG_TARGETS}; do
				PKG_TARGET_ARCH="${arch}" configure_build
			done
			;;
	esac
}

msg()
{
	printf 'build-essential config: '
	printf "${@}"
	printf '\n'
}

configure_build()
{
	local ss=
	local name=
	local pkg=

	# Generate a sed script to edit files.
	ss=''
	for name in TARGET_ARCH; do
		ss="${ss}s&@PKG_${name}@&$(eval echo \$\{PKG_${name}\})&;"
	done

	# Write metadata for <pkgbase>-<target> packages.
	for pkg in ${TPL_PKGS}; do
		mkdir -p "${pkg}-${PKG_TARGET_ARCH}.pkg"
		sed "${ss}" "${pkg}.pkg.in/control" \
			>"${pkg}-${PKG_TARGET_ARCH}.pkg/control"
		msg 'Metadata for package "%s" generated.' \
			"${pkg}-${PKG_TARGET_ARCH}"
	done
}

clean()
{
	local pkg=

	# Remove generated metadata for <pkgbase>-<target> packages.
	for pkg in ${TPL_PKGS}; do
		rm -Rf "${pkg}"-*-*-*.pkg/
	done
}

main "${@}"