upstream_archive = busybox-$(OPK_SOURCE_VERSION_UPSTREAM).tar.bz2
upstream_url = http://www.busybox.net/downloads/$(upstream_archive)
source_archive = ../busybox-$(OPK_SOURCE_VERSION_UPSTREAM).orig.tar.bz2
keys = ACC9965B

$(source_archive):
	wget "$(upstream_url)"
	set -e; if gpg --version >/dev/null 2>&1; then \
		wget "$(upstream_url).sign"; \
		[ -e ../keyring.gpg ] || \
			gpg --keyring ../keyring.gpg --no-default-keyring \
				--recv-keys $(keys); \
		gpg --verify --keyring ../keyring.gpg \
			"$(upstream_archive).sign"; \
		sed -n 's/^MD5:  //p' "$(upstream_archive).sign" | md5sum -c; \
		sed -n 's/^SHA1: //p' "$(upstream_archive).sign" | sha1sum -c; \
	fi
	mv "$(upstream_archive)" "$(source_archive)"

source: $(source_archive)