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