233 lines
7.6 KiB
Docker
233 lines
7.6 KiB
Docker
#
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# NOTE: THIS DOCKERFILE IS GENERATED VIA "apply-templates.sh"
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#
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# PLEASE DO NOT EDIT IT DIRECTLY.
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#
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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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# 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: 27 September 2024
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ENV BUSYBOX_VERSION 1.37.0
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ENV BUSYBOX_SHA256 3311dff32e746499f4df0d5df04d7eb396382d7e108bb9250e7b519b837043a4
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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 "@$SOURCE_DATE_EPOCH" --rfc-2822
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WORKDIR /usr/src/busybox
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# apply necessary/minimal patches (see /.patches/ in the top level of the repository)
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COPY \
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/.patches/no-cbq.patch \
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/.patches/sha1_process_block64_shaNI.patch \
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./.patches/
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RUN set -eux; \
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for patch in .patches/*.patch; do \
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patch -p1 --input="$patch"; \
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done; \
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rm -rf .patches
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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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CONFIG_STATIC=y \
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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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\
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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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'; \
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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="$(nproc)"; \
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# https://git.busybox.net/busybox/tree/Makefile?h=1_37_stable#n145
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# we need to override SUBARCH explicitly (via ARCH) to avoid "uname -m" which gives the wrong answer for builds like i386 on an amd64 machine because kernel architecture != userspace architecture
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# see https://git.busybox.net/busybox/tree/arch?h=1_37_stable#n145 for the only important values this *has* to match (everything else is best-effort, and needs to match the munging in https://git.busybox.net/busybox/tree/Makefile?h=1_37_stable#n185)
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distroArch="$(apk --print-arch)"; \
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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 "$ARCH" ]; \
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export ARCH; \
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make -j "$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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# 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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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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buildrootVersion='2025.08'; \
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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 \
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; do \
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dir="$(dirname "$file")"; \
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mkdir -p "../buildroot/$dir"; \
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curl -fL -o "../buildroot/$file" "https://gitlab.com/buildroot.org/buildroot/-/raw/$buildrootVersion/$file"; \
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[ -s "../buildroot/$file" ]; \
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done; \
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\
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mkdir -p rootfs/etc; \
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ln -vL \
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../buildroot/system/skeleton/etc/group \
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../buildroot/system/skeleton/etc/passwd \
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../buildroot/system/skeleton/etc/shadow \
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rootfs/etc/ \
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; \
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# CVE-2019-5021, https://github.com/docker-library/official-images/pull/5880#issuecomment-490681907
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grep -E '^root::' rootfs/etc/shadow; \
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sed -ri -e 's/^root::/root:*:/' rootfs/etc/shadow; \
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grep -E '^root:[*]:' rootfs/etc/shadow; \
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# set expected permissions, etc too (https://gitlab.com/buildroot.org/buildroot/-/blob/HEAD/system/device_table.txt)
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awk ' \
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!/^#/ { \
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if ($2 != "d" && $2 != "f") { \
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printf "error: unknown type \"%s\" encountered in line %d: %s\n", $2, NR, $0 > "/dev/stderr"; \
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exit 1; \
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} \
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sub(/^\/?/, "rootfs/", $1); \
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if ($2 == "d") { \
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printf "mkdir -p %s\n", $1; \
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} \
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printf "chmod %s %s\n", $3, $1; \
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} \
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' ../buildroot/system/device_table.txt | sh -eux
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# create missing home directories and ensure /usr/bin/env exists
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RUN set -eux; \
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cd rootfs; \
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for userHome in $(awk -F ':' '{ print $3 ":" $4 "=" $6 }' etc/passwd); do \
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user="${userHome%%=*}"; \
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home="${userHome#*=}"; \
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home="./${home#/}"; \
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if [ ! -d "$home" ]; then \
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mkdir -p "$home"; \
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chown "$user" "$home"; \
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chmod 755 "$home"; \
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fi; \
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done; \
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if [ ! -s usr/bin/env ] && [ -s bin/env ]; then \
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mkdir -p usr/bin; \
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ln -s ../../bin/env usr/bin/; \
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fi
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# test and make sure it works
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RUN chroot rootfs /usr/bin/env sh -xec 'true'
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# ensure correct timezone (UTC)
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RUN set -eux; \
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ln -vL /usr/share/zoneinfo/UTC rootfs/etc/localtime; \
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[ "$(chroot rootfs date +%Z)" = 'UTC' ]
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# test and make sure DNS works too
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RUN set -eux; \
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cp -L /etc/resolv.conf rootfs/etc/; \
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chroot rootfs /bin/sh -xec 'nslookup google.com'; \
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rm rootfs/etc/resolv.conf
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# vim:set ft=dockerfile:
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