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Merge pull request #753 from thockin/v4_smaller_image
Make the container image smaller
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| Original file line number | Diff line number | Diff line change |
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| #!/bin/sh | ||
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| # Copyright 2022 The Kubernetes Authors. | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
|
|
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| # USAGE: clean-distroless.sh <staging_dir> | ||
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| if [ -z "$1" ]; then | ||
| echo "usage: $0 <staging-dir>" | ||
| exit 1 | ||
| fi | ||
| ROOT="$1" | ||
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| # This script needs to be "sh" and not "bash", but there are no arrays in sh, | ||
| # except for "$@". We need array semantics on the off chance we ever have a | ||
| # pathname with spaces in it. | ||
| set -- \ | ||
| /usr/share/base-files \ | ||
| /usr/share/man \ | ||
| /usr/lib/*-linux-gnu/gconv \ | ||
| /usr/bin/c_rehash \ | ||
| /usr/bin/openssl \ | ||
| /iptables-wrapper-installer.sh \ | ||
| /clean-distroless.sh | ||
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| for item; do | ||
| rm -rf "${ROOT}/${item}" | ||
| done |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,278 @@ | ||
| #!/bin/bash | ||
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| # Copyright 2022 The Kubernetes Authors. | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
|
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| # USAGE: stage-binaries.sh -o <staging-dir> ( -p <package> | -b binary )..." | ||
| # | ||
| # Stages all the packages or files and their dependencies (+ libraries and | ||
| # copyrights) to the staging dir. | ||
| # | ||
| # This is intended to be used in a multi-stage docker build with a distroless/base | ||
| # or distroless/cc image. | ||
|
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| set -o errexit | ||
| set -o nounset | ||
| set -o pipefail | ||
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| # A handler for when we exit automatically on an error. | ||
| # Borrowed from kubernetes, which was borrowed from | ||
| # https://gist.github.com/ahendrix/7030300 | ||
| function errexit() { | ||
| # If the shell we are in doesn't have errexit set (common in subshells) then | ||
| # don't dump stacks. | ||
| set +o | grep -qe "-o errexit" || return | ||
|
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| local file="$(basename "${BASH_SOURCE[1]}")" | ||
| local line="${BASH_LINENO[0]}" | ||
| local func="${FUNCNAME[1]:-}" | ||
| echo "FATAL: error at ${func}() ${file}:${line}" >&2 | ||
| } | ||
|
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| # trap ERR to provide an error handler whenever a command exits nonzero this | ||
| # is a more verbose version of set -o errexit | ||
| trap 'errexit' ERR | ||
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| # setting errtrace allows our ERR trap handler to be propagated to functions, | ||
| # expansions and subshells | ||
| set -o errtrace | ||
|
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| # file_to_package identifies the debian package that provided the file $1 | ||
| function file_to_package() { | ||
| local file="$1" | ||
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| # `dpkg-query --search $file-pattern` outputs lines with the format: "$package: $file-path" | ||
| # where $file-path belongs to $package | ||
| # https://manpages.debian.org/jessie/dpkg/dpkg-query.1.en.html | ||
| dpkg-query --search "$(realpath "${file}")" | cut -d':' -f1 | ||
| } | ||
|
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| # package_to_copyright gives the path to the copyright file for the package $1 | ||
| function package_to_copyright() { | ||
| local pkg="$1" | ||
| echo "/usr/share/doc/${pkg}/copyright" | ||
| } | ||
|
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| # stage_file stages the filepath $1 to $2, following symlinks | ||
| # and staging copyrights | ||
| function stage_file() { | ||
| local file="$1" | ||
| local staging="$2" | ||
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| # copy the named path | ||
| cp -a --parents "${file}" "${staging}" | ||
|
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| # recursively follow symlinks | ||
| if [[ -L "${file}" ]]; then | ||
| stage_file "$(cd "$(dirname "${file}")" || exit; realpath -s "$(readlink "${file}")")" "${staging}" | ||
| fi | ||
|
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| # get the package so we can stage package metadata as well | ||
| local package="$(file_to_package "${file}")" | ||
| # stage the copyright for the file, if it exists | ||
| local copyright="$(package_to_copyright "${package}")" | ||
| if [[ -f "${copyright}" ]]; then | ||
| cp -a --parents "${copyright}" "${staging}" | ||
| fi | ||
|
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| # stage the package status mimicking bazel | ||
| # https://github.com/bazelbuild/rules_docker/commit/f5432b813e0a11491cf2bf83ff1a923706b36420 | ||
| # instead of parsing the control file, we can just get the actual package status with dpkg | ||
| dpkg -s "${package}" > "${staging}/var/lib/dpkg/status.d/${package}" | ||
| } | ||
|
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| function grep_allow_nomatch() { | ||
| # grep exits 0 on match, 1 on no match, 2 on error | ||
| grep "$@" || [[ $? == 1 ]] | ||
| } | ||
|
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| function _indent() { | ||
| while read -r X; do | ||
| echo " ${X}" | ||
| done | ||
| } | ||
|
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| # run "$@" and indent the output | ||
| function indent() { | ||
| # This lets us process stderr and stdout without merging them, without | ||
| # bash-isms. | ||
| { "$@" 2>&1 1>&3 | _indent; } 3>&1 1>&2 | _indent | ||
| } | ||
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| function stage_file_list() { | ||
| local pkg="$1" | ||
| local staging="$2" | ||
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| dpkg -L "${pkg}" \ | ||
| | grep_allow_nomatch -vE '(/\.|/usr/share/(man|doc|.*-completion))' \ | ||
| | while read -r file; do | ||
| if [[ -f "$file" ]]; then | ||
| stage_file "${file}" "${staging}" | ||
| if [[ -L "$file" ]]; then | ||
| continue | ||
| fi | ||
| if [[ -x "$file" ]]; then | ||
| stage_binaries "${staging}" "${file}" | ||
| fi | ||
| fi | ||
| done | ||
| } | ||
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| function get_dependent_packages() { | ||
| local pkg="$1" | ||
| apt-cache depends "${pkg}" \ | ||
| | grep_allow_nomatch Depends \ | ||
| | awk -F '.*Depends:[[:space:]]?' '{print $2}' | ||
| } | ||
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| # Args: | ||
| # $1: path to staging dir | ||
| # $2+: package names | ||
| function stage_packages() { | ||
| local staging="$1" | ||
| shift | ||
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| mkdir -p "${staging}"/var/lib/dpkg/status.d/ | ||
| indent apt-get -y -qq -o Dpkg::Use-Pty=0 update | ||
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| local pkg | ||
| for pkg; do | ||
| echo "staging package ${pkg}" | ||
| indent apt-get -y -qq -o Dpkg::Use-Pty=0 --no-install-recommends install "${pkg}" | ||
| stage_file_list "${pkg}" "$staging" | ||
| get_dependent_packages "${pkg}" \ | ||
| | while read -r dep; do | ||
| stage_file_list "${dep}" "${staging}" | ||
| done | ||
| done | ||
| } | ||
|
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| # binary_to_libraries identifies the library files needed by the binary $1 with ldd | ||
| function binary_to_libraries() { | ||
| local bin="$1" | ||
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| # see: https://man7.org/linux/man-pages/man1/ldd.1.html | ||
| # Each output line looks like: | ||
| # linux-vdso.so.1 (0x00007fffb11c3000) | ||
| # or | ||
| # libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f2f52d26000) | ||
| # | ||
| # This is a little funky because ldd treats static binaries as errors ("not | ||
| # a dynamic executable") but static libraries as non-errors ("statically | ||
| # linked"). We want real ldd errors, but static binaries are OK. | ||
| if [[ "$(ldd "${bin}" 2>&1)" =~ "not a dynamic executable" ]]; then | ||
| return | ||
| fi | ||
| ldd "${bin}" \ | ||
| `# skip static binaries` \ | ||
| | grep_allow_nomatch -v "statically linked" \ | ||
| `# linux-vdso.so.1 is a special virtual shared object from the kernel` \ | ||
| `# see: http://man7.org/linux/man-pages/man7/vdso.7.html` \ | ||
| | grep_allow_nomatch -v 'linux-vdso.so.1' \ | ||
| `# strip the leading '${name} => ' if any so only '/lib-foo.so (0xf00)' remains` \ | ||
| | sed -E 's#.* => /#/#' \ | ||
| `# we want only the path remaining, not the (0x${LOCATION})` \ | ||
| | awk '{print $1}' | ||
| } | ||
|
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| function stage_binaries() { | ||
| local staging="$1" | ||
| shift | ||
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| local bin | ||
| for bin; do | ||
| echo "staging binary ${bin}" | ||
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| # locate the path to the binary | ||
| local binary_path | ||
| binary_path="$(which "${bin}")" | ||
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| # ensure package metadata dir | ||
| mkdir -p "${staging}/var/lib/dpkg/status.d/" | ||
|
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| # stage the binary itself | ||
| stage_file "${binary_path}" "${staging}" | ||
|
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| # stage the dependencies of the binary | ||
| binary_to_libraries "${binary_path}" \ | ||
| | while read -r lib; do | ||
| stage_file "${lib}" "${staging}" | ||
| done | ||
| done | ||
| } | ||
|
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| function usage() { | ||
| echo "$0 -o <staging-dir> ( -p <package> | -b binary )..." | ||
| } | ||
|
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| function main() { | ||
| local staging="" | ||
| local pkgs=() | ||
| local bins=() | ||
|
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| while [ "$#" -gt 0 ]; do | ||
| case "$1" in | ||
| "-?") | ||
| usage | ||
| exit 0 | ||
| ;; | ||
| "-b") | ||
| if [[ -z "${2:-}" ]]; then | ||
| echo "error: flag '-b' requires an argument" >&2 | ||
| usage >&2 | ||
| exit 2 | ||
| fi | ||
| bins+=("$2") | ||
| shift 2 | ||
| ;; | ||
| "-p") | ||
| if [[ -z "${2:-}" ]]; then | ||
| echo "error: flag '-p' requires an argument" >&2 | ||
| usage >&2 | ||
| exit 2 | ||
| fi | ||
| pkgs+=("$2") | ||
| shift 2 | ||
| ;; | ||
| "-o") | ||
| if [[ -z "${2:-}" ]]; then | ||
| echo "error: flag '-o' requires an argument" >&2 | ||
| usage >&2 | ||
| exit 2 | ||
| fi | ||
| staging="$2" | ||
| shift 2 | ||
| ;; | ||
| *) | ||
| echo "error: unknown argument: $1" >&2 | ||
| usage >&2 | ||
| exit 3 | ||
| ;; | ||
| esac | ||
| done | ||
|
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| if [[ -z "${staging}" ]]; then | ||
| usage >&2 | ||
| exit 4 | ||
| fi | ||
|
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| if (( "${#pkgs[@]}" > 0 )); then | ||
| stage_packages "${staging}" "${pkgs[@]}" | ||
| fi | ||
| if (( "${#bins[@]}" > 0 )); then | ||
| stage_binaries "${staging}" "${bins[@]}" | ||
| fi | ||
| } | ||
|
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| main "$@" |