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Dockerfile
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#
# NOTE: THIS DOCKERFILE IS GENERATED VIA "apply-templates.sh"
#
# PLEASE DO NOT EDIT IT DIRECTLY.
#
# stage1: builder
FROM debian:buster-slim as builder
RUN set -eux; \
apt-get update; \
apt-get install -y \
bzip2 \
curl \
gcc \
gnupg dirmngr \
make \
numactl \
zlib1g \
iproute2 \
ethtool \
; \
gccMultiarch="$(gcc -print-multiarch)"; \
ln -vL /usr/lib/$gccMultiarch/*.so.* /lib/$gccMultiarch/; \
rm -rf /var/lib/apt/lists/*
# pub 1024D/ACC9965B 2006-12-12
# Key fingerprint = C9E9 416F 76E6 10DB D09D 040F 47B7 0C55 ACC9 965B
# uid Denis Vlasenko <[email protected]>
# sub 1024g/2C766641 2006-12-12
RUN gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys C9E9416F76E610DBD09D040F47B70C55ACC9965B
ARG BUSYBOX_VERSION
RUN set -eux; \
tarball="busybox-${BUSYBOX_VERSION}.tar.bz2"; \
busyboxSha256=$(curl "https://busybox.net/downloads/$tarball.sha256" | cut -d ' ' -f 1); \
curl -fL -o busybox.tar.bz2.sig "https://busybox.net/downloads/$tarball.sig"; \
curl -fL -o busybox.tar.bz2 "https://busybox.net/downloads/$tarball"; \
echo "$busyboxSha256 *busybox.tar.bz2" | sha256sum -c -; \
gpg --batch --verify busybox.tar.bz2.sig busybox.tar.bz2; \
mkdir -p /usr/src/busybox; \
tar -xf busybox.tar.bz2 -C /usr/src/busybox --strip-components 1; \
rm busybox.tar.bz2*
WORKDIR /usr/src/busybox
COPY lib-requires.txt ./
RUN set -eux; \
\
setConfs=' \
CONFIG_AR=y \
CONFIG_FEATURE_AR_CREATE=y \
CONFIG_FEATURE_AR_LONG_FILENAMES=y \
# CONFIG_LAST_SUPPORTED_WCHAR: see https://github.com/docker-library/busybox/issues/13 (UTF-8 input)
CONFIG_LAST_SUPPORTED_WCHAR=0 \
# As long as we rely on libnss (see below), we have to have libc.so anyhow, so we've removed CONFIG_STATIC here... :cry:
'; \
\
unsetConfs=' \
CONFIG_FEATURE_SYNC_FANCY \
'; \
\
make defconfig; \
\
for conf in $unsetConfs; do \
sed -i \
-e "s!^$conf=.*\$!# $conf is not set!" \
.config; \
done; \
\
for confV in $setConfs; do \
conf="${confV%=*}"; \
sed -i \
-e "s!^$conf=.*\$!$confV!" \
-e "s!^# $conf is not set\$!$confV!" \
.config; \
if ! grep -q "^$confV\$" .config; then \
echo "$confV" >> .config; \
fi; \
done; \
\
make oldconfig; \
\
# trust, but verify
for conf in $unsetConfs; do \
! grep -q "^$conf=" .config; \
done; \
for confV in $setConfs; do \
grep -q "^$confV\$" .config; \
done
RUN set -eux; \
nproc="$(nproc)"; \
make -j "$nproc" busybox; \
./busybox --help; \
mkdir -p rootfs/bin; \
ln -vL busybox rootfs/bin/; \
\
# copy "getconf" from Debian
getconf="$(which getconf)"; \
ln -vL "$getconf" rootfs/bin/getconf; \
\
# hack hack hack hack hack
# with glibc, busybox (static or not) uses libnss for DNS resolution :(
mkdir -p rootfs/etc; \
cp /etc/nsswitch.conf rootfs/etc/; \
mkdir -p rootfs/lib; \
ln -sT lib rootfs/lib64; \
gccMultiarch="$(gcc -print-multiarch)"; \
requiredLibs=$(cat lib-requires.txt | sed -e 's/[,:;\|\t\r\n ]*//g' | awk '{print "/lib/'"$gccMultiarch"'/"$0"*.so.*"}'); \
set -- \
rootfs/bin/busybox \
rootfs/bin/getconf \
/lib/"$gccMultiarch"/libnss*.so.* \
# needed libs of glibc, such as libc, libthread and others: https://stackoverflow.com/a/11210463/433558
$requiredLibs \
; \
while [ "$#" -gt 0 ]; do \
f="$1"; shift; \
fn="$(basename "$f")"; \
if [ -e "rootfs/lib/$fn" ]; then continue; fi; \
if [ "${f#rootfs/}" = "$f" ]; then \
if [ "${fn#ld-}" = "$fn" ]; then \
ln -vL "$f" "rootfs/lib/$fn"; \
else \
cp -v "$f" "rootfs/lib/$fn"; \
fi; \
fi; \
ldd="$(ldd "$f" | awk ' \
$1 ~ /^\// { print $1; next } \
$2 == "=>" && $3 ~ /^\// { print $3; next } \
')"; \
set -- "$@" $ldd; \
done; \
chroot rootfs /bin/getconf _NPROCESSORS_ONLN; \
\
chroot rootfs /bin/busybox --install /bin
# install user defined files
RUN set -eux; \
cp /bin/ip rootfs/bin/; \
cp /sbin/ethtool rootfs/bin/; \
chmod -R +x rootfs/bin/ip rootfs/bin/ethtool;
# install a few extra files from buildroot (/etc/passwd, etc)
RUN set -eux; \
buildrootVersion='2021.05'; \
for file in \
system/device_table.txt \
system/skeleton/etc/group \
system/skeleton/etc/passwd \
system/skeleton/etc/shadow \
; do \
dir="$(dirname "$file")"; \
mkdir -p "../buildroot/$dir"; \
curl -fL -o "../buildroot/$file" "https://git.busybox.net/buildroot/plain/$file?id=$buildrootVersion"; \
[ -s "../buildroot/$file" ]; \
done; \
\
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://git.busybox.net/buildroot/tree/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
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 "$home"; \
fi; \
done
# test and make sure it works
RUN chroot rootfs /bin/sh -xec 'true'
# ensure correct timezone (UTC)
RUN set -eux; \
ln -vL /usr/share/zoneinfo/UTC rootfs/etc/localtime; \
[ "$(chroot rootfs date +%Z)" = 'UTC' ]
# test and make sure DNS works too
RUN cp -L /etc/resolv.conf rootfs/etc/; \
echo "nameserver 114.114.114.114" >> rootfs//etc/resolv.conf; \
chroot rootfs /bin/sh -xec 'nslookup baidu.com';
#--------------------------
# stage2: busybox
FROM scratch as busybox
COPY --from=builder /usr/src/busybox/rootfs/ /
# ensure command /bin/sh is available
RUN sh -xec 'true'
WORKDIR /root/
CMD ["sh"]