FROM scratch as base
ENV VERSION=1.7.2
ENV SRC_HASH=a18a6a24307443a8ace7a8acc2ce79fbbe6826cd0edf98d6326d0225d6a5d6e6
ENV SRC_FILE=libunwind-${VERSION}.tar.gz
ENV SRC_SITE=https://github.com/libunwind/libunwind/releases/download/v${VERSION}/${SRC_FILE}

FROM base as fetch
ADD --checksum=sha256:${SRC_HASH} ${SRC_SITE} .

FROM fetch as build
COPY --from=busybox . /
COPY --from=gcc . /
COPY --from=make . /
COPY --from=musl . /
COPY --from=binutils . /
COPY --from=autoconf . /
COPY --from=automake . /
COPY --from=libtool . /
RUN tar -xf ${SRC_FILE}
WORKDIR libunwind-${VERSION}
RUN --network=none <<-EOF
	set -eux
	./configure \
		--build=x86_64-unknown-linux-musl \
		--host=x86_64-unknown-linux-musl \
		--prefix=/usr \
		--sysconfdir=/etc \
		--mandir=/usr/share/man \
		--localstatedir=/usr/share/man \
		--enable-cxx-exceptions \
		--disable-tests \
		--infodir=/usr/share/info || cat config.log
	make
EOF

FROM build as install
RUN --network=none make DESTDIR=/rootfs install
RUN find /rootfs -exec touch -hcd "@0" "{}" +

FROM scratch as package
COPY --from=install /rootfs /