busybox/Dockerfile

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FROM frebib/debian-builder as builder
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ARG ARCH=x86_64
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ARG ARCH_ALT=i686
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ARG GLIBC_VER=2.26
ARG BUSYB_VER=1.27.1
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ARG SU_EXEC_VER=v0.2
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ARG TINI_VER=v0.15.0
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ARG PREFIX=/output
WORKDIR $PREFIX
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#Set up our dependencies, configure the output filesystem a bit
RUN mkdir -p bin dev etc home lib proc root sbin tmp usr/bin usr/sbin usr/lib var && \
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# This is probably only relevant on 64bit systems?
ln -sv usr/lib usr/lib64 && \
ln -sv lib lib64
# Pull tini and su-exec utilities
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RUN curl -fL https://github.com/javabean/su-exec/releases/download/${SU_EXEC_VER}/su-exec.amd64 > sbin/su-exec && \
curl -fL https://github.com/krallin/tini/releases/download/${TINI_VER}/tini-amd64 > sbin/tini && \
chmod +x sbin/su-exec sbin/tini
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WORKDIR /tmp/glibc/build
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# Download and build glibc from source
RUN curl -fL https://ftp.gnu.org/gnu/glibc/glibc-${GLIBC_VER}.tar.xz \
| tar xJ --strip-components=1 -C .. && \
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\
echo "slibdir=/lib" >> configparms && \
echo "rtlddir=/lib" >> configparms && \
echo "sbindir=/bin" >> configparms && \
echo "rootsbindir=/sbin" >> configparms && \
echo "build-programs=yes" >> configparms && \
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\
exec >/dev/null && \
../configure \
--prefix= \
--libdir=/lib \
--libexecdir=/lib \
--enable-add-ons \
--enable-obsolete-rpc \
--enable-kernel=3.10.0 \
--enable-bind-now \
--disable-profile \
--enable-stackguard-randomization \
--enable-stack-protector=strong \
--enable-lock-elision \
--enable-multi-arch \
--disable-werror && \
make -j "$(nproc)" && \
make -j "$(nproc)" install_root="$(pwd)/out" install
# Strip binaries to reduce their size
RUN apt-get install -y file && \
find out/{s,}bin -exec file {} \; | grep -i elf \
| sed 's|^\(.*\):.*|\1|' | xargs strip -s && \
\
# Patch ldd to use sh not bash
sed -i '1s/.*/#!\/bin\/sh/' out/bin/ldd && \
# Copy glibc libs & generate ld cache
cp -d out/lib/*.so "${PREFIX}/lib" && \
cp -d out/bin/ldd "${PREFIX}/bin" && \
cp -d out/sbin/ldconfig "${PREFIX}/sbin" && \
\
echo /usr/lib > "${PREFIX}/etc/ld.so.conf"
WORKDIR /tmp/busybox
# Download and build busybox from source
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RUN curl -fL https://busybox.net/downloads/busybox-${BUSYB_VER}.tar.bz2 \
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| tar xj --strip-components=1 && \
# Use default configuration
make defconfig && \
make -j "$(nproc)" && \
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cp busybox "${PREFIX}/bin" && \
# "Install" busybox, creating symlinks to all binaries it provides
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./busybox --list-full | xargs -i ln -s /bin/busybox "${PREFIX}/{}"
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WORKDIR $PREFIX
# Add default skeleton configuration files
RUN for f in passwd shadow group profile; do \
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curl -fL -o "${PREFIX}/etc/$f" "https://git.busybox.net/buildroot/plain/system/skeleton/etc/$f"; \
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done && \
\
# Copy UTC localtime to output
cp /usr/share/zoneinfo/Etc/UTC etc/
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# Generate initial ld.so.cache so ELF binaries work.
# This is important otherwise everything will error with
# 'no such file or directory' when looking for libraries
RUN ${PREFIX}/sbin/ldconfig -r ${PREFIX}
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# =============
FROM scratch
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WORKDIR /
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COPY --from=builder /output/ /
RUN mkdir -p /tmp && \
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chmod 1777 /tmp
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CMD ["/bin/sh"]