86 lines
2.8 KiB
Docker
86 lines
2.8 KiB
Docker
FROM debian:jessie-slim as builder
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ARG ARCH=x86_64
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ARG DEBIAN_FRONTEND=noninteractive
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ARG GLIBC_VER=2.25
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ARG BUSYB_VER=1.26.2
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ARG SU_EXEC_VER=v0.2
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ARG TINI_VER=v0.14.0
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ARG PREFIX=/output
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WORKDIR $PREFIX
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#Set up our dependencies, configure the output filesystem a bit
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RUN apt-get update -qy && \
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apt-get install -qy curl build-essential gawk linux-libc-dev && \
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mkdir -p bin dev etc home lib proc root sbin tmp usr/bin usr/sbin usr/lib var && \
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# This is probably only relevant on 64bit systems?
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ln -sv lib lib64
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# Pull busybox and some other utilities
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RUN curl -L https://busybox.net/downloads/binaries/$BUSYB_VER-defconfig-multiarch/busybox-$ARCH > bin/busybox && \
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curl -L https://github.com/javabean/su-exec/releases/download/${SU_EXEC_VER}/su-exec.amd64 > sbin/su-exec && \
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curl -L https://github.com/krallin/tini/releases/download/${TINI_VER}/tini-amd64 > sbin/tini && \
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chmod +x bin/busybox sbin/su-exec sbin/tini && \
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# "Install" busybox, creating symlinks to all binaries it provides
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bin/busybox --list-full | xargs -i ln -s /bin/busybox "$PREFIX/{}"
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WORKDIR /tmp
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ARG CFLAGS="-Os -pipe -fstack-protector-strong"
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ARG LDFLAGS="-Wl,-O1,--sort-common -Wl,-s"
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# Download and build glibc from source
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RUN curl -L https://ftp.gnu.org/gnu/glibc/glibc-$GLIBC_VER.tar.xz | tar xJ && \
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mkdir -p glibc-build && cd glibc-build && \
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\
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echo "slibdir=/lib" >> configparms && \
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echo "rtlddir=/lib" >> configparms && \
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echo "sbindir=/bin" >> configparms && \
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echo "rootsbindir=/bin" >> configparms && \
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\
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# Fix debian lib path weirdness
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rm -rf /usr/include/x86_64-linux-gnu/c++ && \
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ln -s /usr/include/x86_64-linux-gnu/* /usr/include && \
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\
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../glibc-$GLIBC_VER/configure \
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--prefix="$(pwd)/root" \
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--libdir="$(pwd)/root/lib" \
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--libexecdir=/lib \
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--with-headers=/usr/include \
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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 && make install_root=$(pwd)/out install
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# Copy glibc libs & generate ld cache
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RUN cp -d glibc-build/out/lib/*.so "$PREFIX/lib" && \
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echo '/usr/lib' > "$PREFIX/etc/ld.so.conf" && \
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ldconfig -r "$PREFIX"
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WORKDIR $PREFIX
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# Add root user and group
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RUN echo 'root:x:0:0:root:/root:/bin/sh'\\n\
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'nobody:x:65534:65534:nobody:/:/sbin/nologin' \
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> etc/passwd && \
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echo 'root:::0:::::\nnobody:!::0:::::' \
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> etc/shadow && \
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echo 'root:x:0:root\nnogroup:x:65533\nnobody:x:65544' \
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> etc/group
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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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CMD ["sh"]
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