498 lines
15 KiB
Docker
498 lines
15 KiB
Docker
{{ if env.variant == "musl" then ( -}}
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FROM alpine:3.22
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RUN set -eux; \
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apk add --no-cache \
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bzip2 \
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coreutils \
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curl \
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gcc \
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gnupg \
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linux-headers \
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make \
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musl-dev \
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patch \
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tzdata \
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# busybox's tar ironically does not maintain mtime of directories correctly (which we need for SOURCE_DATE_EPOCH / reproducibility)
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tar \
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;
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{{ ) else ( -}}
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FROM debian:trixie-slim
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RUN set -eux; \
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apt-get install --update -y \
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bzip2 \
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curl \
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gcc \
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gnupg \
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make \
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patch \
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; \
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apt-get dist-clean
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{{ ) end -}}
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{{ if env.variant == "uclibc" then ( -}}
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# grab/use buildroot for its uClibc toolchain
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RUN set -eux; \
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apt-get install --update -y \
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bc \
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cpio \
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dpkg-dev \
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file \
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g++ \
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perl \
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python3 \
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rsync \
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unzip \
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wget \
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; \
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apt-get dist-clean
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# pub dsa1024 2009-01-15 [SC]
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# AB07 D806 D2CE 741F B886 EE50 B025 BA8B 59C3 6319
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# uid [ unknown] Peter Korsgaard <jacmet@uclibc.org>
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# sub elg2048 2009-01-15 [E]
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RUN mkdir -p ~/.gnupg && gpg --batch --keyserver keyserver.ubuntu.com --recv-keys AB07D806D2CE741FB886EE50B025BA8B59C36319
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# https://buildroot.org/download.html
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# https://buildroot.org/downloads/?C=M;O=D
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ENV BUILDROOT_VERSION {{ .buildroot.version }}
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RUN set -eux; \
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tarball="buildroot-${BUILDROOT_VERSION}.tar.xz"; \
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curl -fL -o buildroot.tar.xz "https://buildroot.org/downloads/$tarball"; \
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curl -fL -o buildroot.tar.xz.sign "https://buildroot.org/downloads/$tarball.sign"; \
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gpg --batch --decrypt --output buildroot.tar.xz.txt buildroot.tar.xz.sign; \
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awk '$1 == "SHA1:" && $2 ~ /^[0-9a-f]+$/ && $3 == "'"$tarball"'" { print $2, "*buildroot.tar.xz" }' buildroot.tar.xz.txt > buildroot.tar.xz.sha1; \
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test -s buildroot.tar.xz.sha1; \
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sha1sum -c buildroot.tar.xz.sha1; \
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mkdir -p /usr/src/buildroot; \
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tar -xf buildroot.tar.xz -C /usr/src/buildroot --strip-components 1; \
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rm buildroot.tar.xz*
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RUN set -eux; \
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\
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cd /usr/src/buildroot; \
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\
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setConfs=' \
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BR2_STATIC_LIBS=y \
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BR2_TOOLCHAIN_BUILDROOT_UCLIBC=y \
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BR2_TOOLCHAIN_BUILDROOT_WCHAR=y \
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'; \
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\
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unsetConfs=' \
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BR2_SHARED_LIBS \
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BR2_TOOLCHAIN_BUILDROOT_GLIBC \
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'; \
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\
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# buildroot arches: https://gitlab.com/buildroot.org/buildroot/-/tree/HEAD/arch
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# buildroot+uclibc arches: https://gitlab.com/buildroot.org/buildroot/-/blob/HEAD/package/uclibc/Config.in ("config BR2_PACKAGE_UCLIBC_ARCH_SUPPORTS")
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dpkgArch="$(dpkg --print-architecture)"; \
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case "$dpkgArch" in \
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# explicitly target amd64 v1
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amd64) \
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setConfs="$setConfs \
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BR2_x86_64=y \
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BR2_x86_x86_64=y \
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"; \
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;; \
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\
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arm64) \
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setConfs="$setConfs \
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BR2_aarch64=y \
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"; \
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# https://github.com/docker-library/busybox/issues/149
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setConfs="$setConfs BR2_ARM64_PAGE_SIZE_64K=y"; \
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unsetConfs="$unsetConfs BR2_ARM64_PAGE_SIZE_4K"; \
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# (it's reasonable to use a larger page size than the host, but not the reverse, and some distros default to 64k instead of 4k)
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;; \
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\
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# https://wiki.debian.org/ArmEabiPort#Choice_of_minimum_CPU
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# https://github.com/free-electrons/toolchains-builder/blob/db259641eaf5bbcf13f4a3c5003e5436e806770c/configs/arch/armv5-eabi.config
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# https://gitlab.com/buildroot.org/buildroot/-/blob/HEAD/arch/Config.in.arm
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# (Debian minimums at ARMv4, we minimum at ARMv5 instead)
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armel) \
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setConfs="$setConfs \
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BR2_arm=y \
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BR2_arm926t=y \
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BR2_ARM_EABI=y \
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BR2_ARM_INSTRUCTIONS_THUMB=y \
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BR2_ARM_SOFT_FLOAT=y \
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"; \
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;; \
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\
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# "Currently the Debian armhf port requires at least an ARMv7 CPU with Thumb-2 and VFP3D16."
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# https://wiki.debian.org/ArmHardFloatPort#Supported_devices
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# https://github.com/free-electrons/toolchains-builder/blob/db259641eaf5bbcf13f4a3c5003e5436e806770c/configs/arch/armv7-eabihf.config
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# https://gitlab.com/buildroot.org/buildroot/-/blob/HEAD/arch/Config.in.arm
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armhf) \
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setConfs="$setConfs \
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BR2_arm=y \
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BR2_cortex_a9=y \
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BR2_ARM_EABIHF=y \
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BR2_ARM_ENABLE_VFP=y \
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BR2_ARM_FPU_VFPV3D16=y \
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BR2_ARM_INSTRUCTIONS_THUMB2=y \
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"; \
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unsetConfs="$unsetConfs BR2_ARM_SOFT_FLOAT"; \
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;; \
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\
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i386) \
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setConfs="$setConfs \
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BR2_i386=y \
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"; \
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;; \
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\
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mips64el) \
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setConfs="$setConfs \
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BR2_mips64el=y \
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BR2_mips_64r2=y \
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BR2_MIPS_NABI64=y \
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"; \
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unsetConfs="$unsetConfs \
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BR2_MIPS_SOFT_FLOAT \
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"; \
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;; \
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\
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# TODO ppc64el ? (needs BR2_TOOLCHAIN_BUILDROOT_UCLIBC support)
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\
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riscv64) \
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setConfs="$setConfs \
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BR2_riscv=y \
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BR2_RISCV_64=y \
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"; \
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;; \
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\
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# TODO s390x ? (needs BR2_TOOLCHAIN_BUILDROOT_UCLIBC support)
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\
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*) \
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echo >&2 "error: unsupported architecture '$dpkgArch'!"; \
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exit 1; \
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;; \
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esac; \
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if [ "$dpkgArch" != 'i386' ]; then \
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unsetConfs="$unsetConfs BR2_i386"; \
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fi; \
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\
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make defconfig; \
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\
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for conf in $unsetConfs; do \
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sed -i \
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-e "s!^$conf=.*\$!# $conf is not set!" \
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.config; \
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done; \
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\
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for confV in $setConfs; do \
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conf="${confV%=*}"; \
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sed -i \
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-e "s!^$conf=.*\$!$confV!" \
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-e "s!^# $conf is not set\$!$confV!" \
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.config; \
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if ! grep -q "^$confV\$" .config; then \
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echo "$confV" >> .config; \
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fi; \
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done; \
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\
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make oldconfig; \
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\
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# trust, but verify
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for conf in $unsetConfs; do \
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! grep -q "^$conf=" .config; \
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done; \
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for confV in $setConfs; do \
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grep -q "^$confV\$" .config; \
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done;
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# https://www.finnie.org/2014/02/13/compiling-busybox-with-uclibc/
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RUN set -eux; \
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# force a particular GNU arch for "host-gmp" (otherwise it fails on some arches)
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gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)"; \
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make -C /usr/src/buildroot \
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HOST_GMP_CONF_OPTS="--build='"$gnuArch"'" \
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# building host-tar:
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# configure: error: you should not run configure as root (set FORCE_UNSAFE_CONFIGURE=1 in environment to bypass this check)
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FORCE_UNSAFE_CONFIGURE=1 \
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-j "$(nproc)" \
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toolchain
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ENV PATH /usr/src/buildroot/output/host/usr/bin:$PATH
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{{ ) else "" end -}}
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# pub 1024D/ACC9965B 2006-12-12
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# Key fingerprint = C9E9 416F 76E6 10DB D09D 040F 47B7 0C55 ACC9 965B
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# uid Denis Vlasenko <vda.linux@googlemail.com>
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# sub 1024g/2C766641 2006-12-12
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RUN mkdir -p ~/.gnupg && gpg --batch --keyserver keyserver.ubuntu.com --recv-keys C9E9416F76E610DBD09D040F47B70C55ACC9965B
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# https://busybox.net: {{ .date }}
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ENV BUSYBOX_VERSION {{ .version }}
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ENV BUSYBOX_SHA256 {{ .sha256 }}
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RUN set -eux; \
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tarball="busybox-${BUSYBOX_VERSION}.tar.bz2"; \
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curl -fL -o busybox.tar.bz2.sig "https://busybox.net/downloads/$tarball.sig"; \
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curl -fL -o busybox.tar.bz2 "https://busybox.net/downloads/$tarball"; \
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echo "$BUSYBOX_SHA256 *busybox.tar.bz2" | sha256sum -c -; \
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gpg --batch --verify busybox.tar.bz2.sig busybox.tar.bz2; \
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# Alpine... 😅
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mkdir -p /usr/src; \
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tar -xf busybox.tar.bz2 -C /usr/src "busybox-$BUSYBOX_VERSION"; \
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mv "/usr/src/busybox-$BUSYBOX_VERSION" /usr/src/busybox; \
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rm busybox.tar.bz2*; \
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\
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# save the tarball's filesystem timestamp persistently (in case building busybox modifies it) so we can use it for reproducible rootfs later
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SOURCE_DATE_EPOCH="$(stat -c '%Y' /usr/src/busybox | tee /usr/src/busybox.SOURCE_DATE_EPOCH)"; \
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date="$(date -d "@$SOURCE_DATE_EPOCH" '+%Y%m%d%H%M.%S')"; \
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touch -t "$date" /usr/src/busybox.SOURCE_DATE_EPOCH; \
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# for logging validation/edification
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date --date "@$SOURCE_DATE_EPOCH" --rfc-2822
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WORKDIR /usr/src/busybox
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{{
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(
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[
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"no-cbq.patch",
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if .version | startswith("1.36.") then empty else
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"sha1_process_block64_shaNI.patch"
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end,
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empty # trailing comma
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]
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| map("/.patches/" + .)
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) as $patches
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| if $patches | length > 0 then (
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-}}
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# apply necessary/minimal patches (see /.patches/ in the top level of the repository)
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COPY \
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{{ $patches | map( -}}
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{{ . }} \
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{{ ) | join("") -}}
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./.patches/
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RUN set -eux; \
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for patch in .patches/*.patch; do \
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patch -p1 --input="$patch"; \
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done; \
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rm -rf .patches
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{{ ) else "" end -}}
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RUN set -eux; \
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\
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# build date/time gets embedded in the BusyBox binary -- SOURCE_DATE_EPOCH should override that
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SOURCE_DATE_EPOCH="$(cat /usr/src/busybox.SOURCE_DATE_EPOCH)"; \
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export SOURCE_DATE_EPOCH; \
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# (has to be set in the config stage for making sure "AUTOCONF_TIMESTAMP" is embedded correctly)
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\
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setConfs=' \
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CONFIG_AR=y \
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CONFIG_FEATURE_AR_CREATE=y \
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CONFIG_FEATURE_AR_LONG_FILENAMES=y \
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# CONFIG_LAST_SUPPORTED_WCHAR: see https://github.com/docker-library/busybox/issues/13 (UTF-8 input)
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CONFIG_LAST_SUPPORTED_WCHAR=0 \
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{{ if env.variant == "glibc" then ( -}}
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# As long as we rely on libnss (see below), we have to have libc.so anyhow, so we've removed CONFIG_STATIC here... 😭
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{{ ) else ( -}}
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CONFIG_STATIC=y \
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{{ ) end -}}
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'; \
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\
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unsetConfs=' \
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CONFIG_FEATURE_SYNC_FANCY \
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{{ if env.variant == "musl" then ( -}}
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\
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# see https://wiki.musl-libc.org/wiki/Building_Busybox
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CONFIG_FEATURE_HAVE_RPC \
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CONFIG_FEATURE_INETD_RPC \
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CONFIG_FEATURE_UTMP \
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CONFIG_FEATURE_WTMP \
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{{ ) else "" end -}}
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'; \
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\
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make defconfig; \
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\
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for conf in $unsetConfs; do \
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sed -i \
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-e "s!^$conf=.*\$!# $conf is not set!" \
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.config; \
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done; \
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\
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for confV in $setConfs; do \
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conf="${confV%=*}"; \
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sed -i \
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-e "s!^$conf=.*\$!$confV!" \
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-e "s!^# $conf is not set\$!$confV!" \
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.config; \
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if ! grep -q "^$confV\$" .config; then \
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echo "$confV" >> .config; \
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fi; \
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done; \
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\
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make oldconfig; \
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\
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# trust, but verify
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for conf in $unsetConfs; do \
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! grep -q "^$conf=" .config; \
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done; \
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for confV in $setConfs; do \
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grep -q "^$confV\$" .config; \
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done
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RUN set -eux; \
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nproc="$(nproc)"; \
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# https://git.busybox.net/busybox/tree/Makefile?h=1_37_stable#n145
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{{ if env.variant == "uclibc" then ( -}}
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CROSS_COMPILE="$(basename /usr/src/buildroot/output/host/usr/*-buildroot-linux-uclibc*)"; \
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export CROSS_COMPILE="$CROSS_COMPILE-"; \
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{{ ) else ( -}}
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# we need to override SUBARCH explicitly (via ARCH) to avoid "uname -m" which gives the wrong answer for builds like i386 on an amd64 machine because kernel architecture != userspace architecture
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# see https://git.busybox.net/busybox/tree/arch?h=1_37_stable#n145 for the only important values this *has* to match (everything else is best-effort, and needs to match the munging in https://git.busybox.net/busybox/tree/Makefile?h=1_37_stable#n185)
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distroArch="$({{ if env.variant == "musl" then "apk --print-arch" else "dpkg --print-architecture" end }})"; \
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case "$distroArch" in \
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amd64 | x86_64) ARCH='x86_64' ;; \
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arm64 | aarch64) ARCH='aarch64' ;; \
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armhf | armel | armv*) ARCH='arm' ;; \
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i386 | x86) ARCH='i386' ;; \
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mips*) ARCH='mips' ;; \
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ppc*) ARCH='powerpc' ;; \
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riscv64) ARCH='riscv64' ;; \
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s390x) ARCH='s390' ;; \
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*) echo >&2 "error: unknown architecture: '$distroArch'"; exit 1 ;; \
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esac; \
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[ -n "$ARCH" ]; \
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export ARCH; \
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{{ ) end -}}
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make -j "$nproc" busybox; \
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./busybox --help; \
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mkdir -p rootfs/bin; \
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ln -vL busybox rootfs/bin/; \
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\
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{{ if env.variant == "uclibc" then ( -}}
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# copy "getconf" from buildroot
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ln -vL ../buildroot/output/target/usr/bin/getconf rootfs/bin/; \
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{{ ) elif env.variant == "glibc" then ( -}}
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# copy "getconf" from Debian
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getconf="$(which getconf)"; \
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ln -vL "$getconf" rootfs/bin/getconf; \
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\
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# hack hack hack hack hack
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# with glibc, busybox (static or not) uses libnss for DNS resolution :(
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mkdir -p rootfs/etc; \
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cp /etc/nsswitch.conf rootfs/etc/; \
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mkdir -p rootfs/lib; \
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ln -sT lib rootfs/lib64; \
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gccMultiarch="$(gcc -print-multiarch)"; \
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set -- \
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rootfs/bin/busybox \
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rootfs/bin/getconf \
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/lib/"$gccMultiarch"/libnss*.so.* \
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# libpthread is part of glibc: https://stackoverflow.com/a/11210463/433558
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/lib/"$gccMultiarch"/libpthread*.so.* \
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; \
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while [ "$#" -gt 0 ]; do \
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f="$1"; shift; \
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fn="$(basename "$f")"; \
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if [ -e "rootfs/lib/$fn" ]; then continue; fi; \
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if [ "${f#rootfs/}" = "$f" ]; then \
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if [ "${fn#ld-}" = "$fn" ]; then \
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ln -vL "$f" "rootfs/lib/$fn"; \
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else \
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cp -v "$f" "rootfs/lib/$fn"; \
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fi; \
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fi; \
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ldd="$(ldd "$f" | awk ' \
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$1 ~ /^\// { print $1; next } \
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$2 == "=>" && $3 ~ /^\// { print $3; next } \
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')"; \
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set -- "$@" $ldd; \
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done; \
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{{ ) elif env.variant == "musl" then ( -}}
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# copy simplified getconf port from Alpine
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# https://github.com/alpinelinux/aports/commits/HEAD/main/musl/getconf.c
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curl -fsSL \
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"https://github.com/alpinelinux/aports/raw/48b16204aeeda5bc1f87e49c6b8e23d9abb07c73/main/musl/getconf.c" \
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-o /usr/src/getconf.c \
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; \
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echo 'd87d0cbb3690ae2c5d8cc218349fd8278b93855dd625deaf7ae50e320aad247c */usr/src/getconf.c' | sha256sum -c -; \
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gcc -o rootfs/bin/getconf -static -Os /usr/src/getconf.c; \
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{{ ) else "" end -}}
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chroot rootfs /bin/getconf _NPROCESSORS_ONLN; \
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\
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# TODO make this create symlinks instead so the output tarball is cleaner (but "-s" outputs absolute symlinks which is kind of annoying to deal with -- we should also consider letting busybox determine the "install paths"; see "busybox --list-full")
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chroot rootfs /bin/busybox --install /bin
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# install a few extra files from buildroot (/etc/passwd, etc)
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RUN set -eux; \
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{{ if env.variant == "uclibc" then "" else ( -}}
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buildrootVersion={{ .buildroot.version | @sh }}; \
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for file in \
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system/device_table.txt \
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system/skeleton/etc/group \
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system/skeleton/etc/passwd \
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|
system/skeleton/etc/shadow \
|
|
; do \
|
|
dir="$(dirname "$file")"; \
|
|
mkdir -p "../buildroot/$dir"; \
|
|
curl -fL -o "../buildroot/$file" "https://gitlab.com/buildroot.org/buildroot/-/raw/$buildrootVersion/$file"; \
|
|
[ -s "../buildroot/$file" ]; \
|
|
done; \
|
|
\
|
|
{{ ) end -}}
|
|
mkdir -p rootfs/etc; \
|
|
ln -vL \
|
|
../buildroot/system/skeleton/etc/group \
|
|
../buildroot/system/skeleton/etc/passwd \
|
|
../buildroot/system/skeleton/etc/shadow \
|
|
rootfs/etc/ \
|
|
; \
|
|
# CVE-2019-5021, https://github.com/docker-library/official-images/pull/5880#issuecomment-490681907
|
|
grep -E '^root::' rootfs/etc/shadow; \
|
|
sed -ri -e 's/^root::/root:*:/' rootfs/etc/shadow; \
|
|
grep -E '^root:[*]:' rootfs/etc/shadow; \
|
|
# set expected permissions, etc too (https://gitlab.com/buildroot.org/buildroot/-/blob/HEAD/system/device_table.txt)
|
|
awk ' \
|
|
!/^#/ { \
|
|
if ($2 != "d" && $2 != "f") { \
|
|
printf "error: unknown type \"%s\" encountered in line %d: %s\n", $2, NR, $0 > "/dev/stderr"; \
|
|
exit 1; \
|
|
} \
|
|
sub(/^\/?/, "rootfs/", $1); \
|
|
if ($2 == "d") { \
|
|
printf "mkdir -p %s\n", $1; \
|
|
} \
|
|
printf "chmod %s %s\n", $3, $1; \
|
|
} \
|
|
' ../buildroot/system/device_table.txt | sh -eux
|
|
|
|
# create missing home directories and ensure /usr/bin/env exists
|
|
RUN set -eux; \
|
|
cd rootfs; \
|
|
for userHome in $(awk -F ':' '{ print $3 ":" $4 "=" $6 }' etc/passwd); do \
|
|
user="${userHome%%=*}"; \
|
|
home="${userHome#*=}"; \
|
|
home="./${home#/}"; \
|
|
if [ ! -d "$home" ]; then \
|
|
mkdir -p "$home"; \
|
|
chown "$user" "$home"; \
|
|
chmod 755 "$home"; \
|
|
fi; \
|
|
done; \
|
|
if [ ! -s usr/bin/env ] && [ -s bin/env ]; then \
|
|
mkdir -p usr/bin; \
|
|
ln -s ../../bin/env usr/bin/; \
|
|
fi
|
|
|
|
# test and make sure it works
|
|
RUN chroot rootfs /usr/bin/env sh -xec 'true'
|
|
|
|
# ensure correct timezone (UTC)
|
|
RUN set -eux; \
|
|
ln -vL /usr/share/zoneinfo/UTC rootfs/etc/localtime; \
|
|
[ "$(chroot rootfs date +%Z)" = 'UTC' ]
|
|
|
|
# test and make sure DNS works too
|
|
RUN set -eux; \
|
|
cp -L /etc/resolv.conf rootfs/etc/; \
|
|
chroot rootfs /bin/sh -xec 'nslookup google.com'; \
|
|
rm rootfs/etc/resolv.conf
|
|
|
|
# vim:set ft=dockerfile:
|