package gen_initramfs and cpio

src/tools/build.mk

@@ -10,9 +10,16 @@ out/curl.tgz: \
 
 out/gen_initramfs.tgz: \
 	out/gcc.tgz \
+	out/binutils.tgz \
 	out/musl.tgz
 	$(call build,tools,gen_initramfs)
 
+out/cpio.tgz: \
+	out/gcc.tgz \
+	out/binutils.tgz \
+	out/musl.tgz
+	$(call build,tools,cpio)
+
 out/tofu.tgz: \
 	out/busybox.tgz \
 	out/go.tgz

src/tools/cpio/Dockerfile

@@ -0,0 +1,46 @@
+ARG REGISTRY=local
+from ${REGISTRY}/binutils as binutils
+from ${REGISTRY}/gcc as gcc
+from ${REGISTRY}/musl as musl
+from ${REGISTRY}/make as make
+from ${REGISTRY}/busybox as busybox
+
+FROM busybox as base
+ENV SRC_SITE=https://ftp.gnu.org/gnu/cpio
+ENV SRC_VERSION=2.15
+ENV SRC_HASH=efa50ef983137eefc0a02fdb51509d624b5e3295c980aa127ceee4183455499e
+ENV SRC_FILE=cpio-${SRC_VERSION}.tar.gz
+
+FROM base as fetch
+RUN set -eux; \
+    wget ${SRC_SITE}/${SRC_FILE}; \
+    echo "${SRC_HASH}  ${SRC_FILE}" | sha256sum -c
+
+FROM fetch as build
+RUN tar -xzf ${SRC_FILE}
+WORKDIR cpio-${SRC_VERSION}
+COPY --from=gcc . /
+COPY --from=binutils . /
+COPY --from=make . /
+COPY --from=musl . /
+RUN set -eux; \
+    mkdir -p /home/user/rootfs/lib; \
+    ./configure \
+        --build=x86_64-unknown-linux-musl \
+        --host=x86_64-unknown-linux-musl \
+        --prefix=/usr \
+        --bindir=/bin \
+        --mandir=/usr/share/man \
+        --infodir=/usr/share/info; \
+    make
+
+FROM build as install
+USER 0:0
+RUN make DESTDIR=/rootfs install
+COPY --from=musl /usr/lib/libc.so /rootfs/lib/ld-musl-x86_64.so.1
+RUN find /rootfs -exec touch -hcd "@0" "{}" +
+
+FROM scratch as package
+COPY --from=install /rootfs /
+ENTRYPOINT ["/bin/cpio"]
+CMD ["--version"]

src/tools/gen_initramfs/Dockerfile

@@ -1,6 +1,7 @@
 ARG REGISTRY=local
 FROM ${REGISTRY}/musl as musl
 FROM ${REGISTRY}/gcc as gcc
+FROM ${REGISTRY}/binutils as binutils
 FROM ${REGISTRY}/busybox as busybox
 
 FROM busybox as base
@@ -16,6 +17,9 @@ RUN echo "${SRC_HASH}  linux-${SRC_VERSION}.tar.xz" | sha256sum -c
 FROM fetch as build
 RUN tar -xf linux-${SRC_VERSION}.tar.xz
 WORKDIR linux-${SRC_VERSION}
+COPY --from=gcc . /
+COPY --from=binutils . /
+COPY --from=musl . /
 RUN gcc usr/gen_init_cpio.c -o usr/gen_init_cpio
 
 FROM build as install