busybox/Dockerfile

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# Pre-define ARGs to ensure correct scope
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ARG GLIBC_VER=2.28
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ARG BUSYB_VER=1.29.2
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ARG SU_EXEC_VER=0.3
ARG TINI_VER=0.18.0
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FROM spritsail/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
ARG BUSYB_VER
ARG SU_EXEC_VER
ARG TINI_VER
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ARG PREFIX=/output
WORKDIR $PREFIX
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#Set up our dependencies, configure the output filesystem a bit
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RUN mkdir -p dev etc home proc root tmp usr/{bin,lib/pkgconfig,lib32} var && \
# Set up directories in a very confusing but very worky way
ln -sv usr/lib lib64 && \
ln -sv usr/lib lib && \
ln -sv usr/bin bin && \
ln -sv usr/bin sbin && \
ln -sv bin usr/sbin
WORKDIR /tmp/glibc/build
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# Download and build glibc from source
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RUN apt install -y bison && \
curl -fL https://ftp.gnu.org/gnu/glibc/glibc-${GLIBC_VER}.tar.xz \
| tar xJ --strip-components=1 -C .. && \
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\
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echo "slibdir=/usr/lib" >> configparms && \
echo "rtlddir=/usr/lib" >> configparms && \
echo "sbindir=/bin" >> configparms && \
echo "rootsbindir=/sbin" >> configparms && \
echo "build-programs=yes" >> configparms && \
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\
../configure \
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--prefix=/usr \
--libdir=/usr/lib \
--libexecdir=/usr/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="$(pwd)/out" install
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RUN strip -s out/sbin/ldconfig && \
# Patch ldd to use sh not bash
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sed -i '1s/.*/#!\/bin\/sh/' out/usr/bin/ldd && \
sed -i 's/lib64/lib/g' out/usr/bin/ldd && \
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# Copy glibc libs & loader
cp -d out/usr/lib/*.so* "${PREFIX}/usr/lib" && \
cp -d out/usr/bin/ldd "${PREFIX}/bin" && \
cp -d out/sbin/ldconfig "${PREFIX}/sbin" && \
\
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echo /usr/lib32 > "${PREFIX}/etc/ld.so.conf"
WORKDIR /tmp/busybox
# Download and build busybox from source
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RUN curl -fL https://busybox.net/downloads/busybox-${BUSYB_VER}.tar.bz2 \
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| tar xj --strip-components=1 && \
# Use minimal configuration for standalone applets
make allnoconfig && \
sed -i -e 's/# CONFIG_PING is not set/CONFIG_PING=y/' \
-e 's/# CONFIG_FEATURE_FANCY_PING is not set/CONFIG_FEATURE_FANCY_PING=y/' \
-e 's/# CONFIG_SU is not set/CONFIG_SU=y/' \
.config && \
# Build ping and su
./make_single_applets.sh && \
cp busybox_PING "${PREFIX}/bin/ping" && \
cp busybox_SU "${PREFIX}/bin/su" && \
\
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# Use default configuration
make defconfig && \
# Disable `busybox --install` function
sed -i -e 's/CONFIG_INSTALLER=y/# CONFIG_INSTALLER is not set/' \
-e 's/CONFIG_PING=y/# CONFIG_PING is not set/' \
-e 's/CONFIG_SU=y/# CONFIG_SU is not set/' \
.config && \
\
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 "${PREFIX}/{}"
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WORKDIR /tmp/su-exec
# Download and build su-exec from source
RUN apt-get -y install xxd
RUN curl -fL https://github.com/frebib/su-exec/archive/v${SU_EXEC_VER}.tar.gz \
| tar xz --strip-components=1 && \
make && \
strip -s su-exec && \
mv su-exec "${PREFIX}/sbin"
WORKDIR /tmp/tini
# Download and build tini from source
ADD tini-gnudef.patch /tmp
RUN curl -fL https://github.com/krallin/tini/archive/v${TINI_VER}.tar.gz \
| tar xz --strip-components=1 && \
patch -p1 < /tmp/tini-gnudef.patch && \
cmake . && \
make tini && \
mv tini "${PREFIX}/sbin"
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WORKDIR $PREFIX
# 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
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RUN ${PREFIX}/sbin/ldconfig -r ${PREFIX} && \
# Copy UTC localtime to output
cp /usr/share/zoneinfo/Etc/UTC etc/
# Add default skeleton configuration files
COPY skel/ .
RUN install -dm 1777 tmp && \
chroot . chmod 755 usr/bin/* sbin/* && \
# Ensure ping and su have correct permissions
chroot . chmod 4755 usr/bin/ping usr/bin/su
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# =============
FROM scratch
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ARG BUSYB_VER
ARG GLIBC_VER
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ARG SU_EXEC_VER
ARG TINI_VER
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LABEL maintainer="Spritsail <busybox@spritsail.io>" \
org.label-schema.vendor="Spritsail" \
org.label-schema.name="Busybox" \
org.label-schema.url="https://github.com/spritsail/busybox" \
org.label-schema.description="Busybox and GNU libc built from source" \
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org.label-schema.version=${BUSYB_VER}/${GLIBC_VER} \
io.spritsail.version.busybox=${BUSYB_VER} \
io.spritsail.version.glibc=${GLIBC_VER} \
io.spritsail.version.su-exec=${SU_EXEC_VER} \
io.spritsail.version.tini=${TINI_VER}
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WORKDIR /
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SHELL ["/bin/sh", "-exc"]
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COPY --from=builder /output/ /
# Workaround for Docker bug (not retaining setuid bit)
RUN chmod 4755 usr/bin/ping usr/bin/su
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ENV ENV="/etc/profile"
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ENV PATH=/usr/local/sbin:/usr/local/bin:/usr/bin
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ENTRYPOINT ["/sbin/tini" , "--"]
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CMD ["/bin/sh"]