mirror of
https://github.com/opencontainers/runc.git
synced 2025-09-27 03:46:19 +08:00
ee1bced18c
While this is used by the majority of upper container runtimes, it was
not needed for runc itself. Since commit 515f09f7 runc uses overlay,
too, so let's add a check for this.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
333 lines
7.5 KiB
Bash
Executable File
333 lines
7.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -e -u
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[ -t 1 ] || NO_COLOR=1
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# bits of this were adapted from check_config.sh in docker
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# see also https://github.com/docker/docker/blob/master/contrib/check-config.sh
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possibleConfigs=(
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'/proc/config.gz'
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"/boot/config-$(uname -r)"
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"/usr/src/linux-$(uname -r)/.config"
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'/usr/src/linux/.config'
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)
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possibleConfigFiles=(
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'config.gz'
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"config-$(uname -r)"
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'.config'
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)
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if ! command -v zgrep &>/dev/null; then
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zgrep() {
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zcat "$2" | grep "$1"
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}
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fi
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kernelVersion="$(uname -r)"
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kernelMajor="${kernelVersion%%.*}"
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kernelMinor="${kernelVersion#"$kernelMajor".}"
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kernelMinor="${kernelMinor%%.*}"
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# Usage: to check if kernel version is < 4.8, use
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# kernel_lt 4 8
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# (here "lt" stands for "less than").
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kernel_lt() {
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[ "$kernelMajor" -lt "$1" ] && return
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[ "$kernelMajor" -eq "$1" ] && [ "$kernelMinor" -lt "$2" ]
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}
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# Usage: to check if kernel version is >= 6.1, use
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# kernel_ge 6 1
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# (here "ge" stands for "greater or equal").
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kernel_ge() {
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! kernel_lt "$1" "$2"
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}
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is_set() {
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zgrep "CONFIG_$1=[y|m]" "$CONFIG" >/dev/null
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}
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is_set_in_kernel() {
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zgrep "CONFIG_$1=y" "$CONFIG" >/dev/null
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}
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is_set_as_module() {
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zgrep "CONFIG_$1=m" "$CONFIG" >/dev/null
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}
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color() {
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[ -n "${NO_COLOR:-}" ] && return
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local codes=()
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if [ "$1" = 'bold' ]; then
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codes=("${codes[@]-}" '1')
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shift
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fi
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if [ "$#" -gt 0 ]; then
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local code=''
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case "$1" in
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# see https://en.wikipedia.org/wiki/ANSI_escape_code#Colors
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black) code=30 ;;
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red) code=31 ;;
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green) code=32 ;;
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yellow) code=33 ;;
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blue) code=34 ;;
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magenta) code=35 ;;
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cyan) code=36 ;;
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white) code=37 ;;
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esac
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if [ "$code" ]; then
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codes=("${codes[@]-}" "$code")
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fi
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fi
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local IFS=';'
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echo -en '\033['"${codes[*]-}"'m'
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}
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wrap_color() {
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text="$1"
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shift
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color "$@"
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echo -n "$text"
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color reset
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echo
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}
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wrap_good() {
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local name="$1"
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shift
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local val="$1"
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shift
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echo "$(wrap_color "$name" white): $(wrap_color "$val" green)" "$@"
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}
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wrap_bad() {
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local name="$1"
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shift
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local val="$1"
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shift
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echo "$(wrap_color "$name" bold): $(wrap_color "$val" bold red)" "$@"
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}
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wrap_warning() {
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wrap_color >&2 "$*" red
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}
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check_flag() {
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if is_set_in_kernel "$1"; then
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wrap_good "CONFIG_$1" 'enabled'
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elif is_set_as_module "$1"; then
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wrap_good "CONFIG_$1" 'enabled (as module)'
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else
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wrap_bad "CONFIG_$1" 'missing'
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fi
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}
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check_flags() {
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for flag in "$@"; do
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echo "- $(check_flag "$flag")"
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done
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}
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check_distro_userns() {
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[ -r /etc/os-release ] || return 0
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# shellcheck source=/dev/null
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. /etc/os-release 2>/dev/null || return 0
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if [[ "${ID}" =~ ^(centos|rhel)$ && "${VERSION_ID}" =~ ^7 ]]; then
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# this is a CentOS7 or RHEL7 system
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grep -q "user_namespace.enable=1" /proc/cmdline || {
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# no user namespace support enabled
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wrap_bad " (RHEL7/CentOS7" "User namespaces disabled; add 'user_namespace.enable=1' to boot command line)"
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}
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fi
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}
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is_config() {
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local config="$1"
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# Todo: more check
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[[ -f "$config" ]] && return 0
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return 1
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}
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search_config() {
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local target_dir=("${1:-${possibleConfigs[@]}}")
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local tryConfig
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for tryConfig in "${target_dir[@]}"; do
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is_config "$tryConfig" && {
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CONFIG="$tryConfig"
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return
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}
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[[ -d "$tryConfig" ]] && {
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for tryFile in "${possibleConfigFiles[@]}"; do
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is_config "$tryConfig/$tryFile" && {
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CONFIG="$tryConfig/$tryFile"
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return
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}
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done
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}
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done
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wrap_warning "error: cannot find kernel config"
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wrap_warning " try running this script again, specifying the kernel config:"
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wrap_warning " CONFIG=/path/to/kernel/.config $0 or $0 /path/to/kernel/.config"
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exit 1
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}
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CONFIG="${1:-}"
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is_config "$CONFIG" || {
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if [[ ! "$CONFIG" ]]; then
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wrap_color "info: no config specified, searching for kernel config ..." white
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search_config
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elif [[ -d "$CONFIG" ]]; then
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wrap_color "info: input is a directory, searching for kernel config in this directory..." white
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search_config "$CONFIG"
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else
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wrap_warning "warning: $CONFIG seems not a kernel config, searching other paths for kernel config ..."
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search_config
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fi
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}
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wrap_color "info: reading kernel config from $CONFIG ..." white
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echo
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echo 'Generally Necessary:'
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cgroup=""
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echo -n '- '
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if [ "$(stat -f -c %t /sys/fs/cgroup 2>/dev/null)" = "63677270" ]; then
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wrap_good 'cgroup hierarchy' 'cgroupv2'
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cgroup="v2"
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else
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cgroupSubsystemDir="$(awk '/[, ](cpu|cpuacct|cpuset|devices|freezer|memory)[, ]/ && $3 == "cgroup" { print $2 }' /proc/mounts | head -n1)"
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cgroupDir="$(dirname "$cgroupSubsystemDir")"
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if [ -d "$cgroupDir/cpu" ] || [ -d "$cgroupDir/cpuacct" ] || [ -d "$cgroupDir/cpuset" ] || [ -d "$cgroupDir/devices" ] || [ -d "$cgroupDir/freezer" ] || [ -d "$cgroupDir/memory" ]; then
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wrap_good 'cgroup hierarchy' 'properly mounted' "[$cgroupDir]"
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cgroup="v1"
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else
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if [ "$cgroupSubsystemDir" ]; then
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wrap_bad 'cgroup hierarchy' 'single mountpoint!' "[$cgroupSubsystemDir]"
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else
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wrap_bad 'cgroup hierarchy' 'nonexistent??'
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fi
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wrap_color ' (see https://github.com/tianon/cgroupfs-mount)' yellow
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fi
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fi
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if [ "$(cat /sys/module/apparmor/parameters/enabled 2>/dev/null)" = 'Y' ]; then
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echo -n '- '
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if command -v apparmor_parser &>/dev/null; then
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wrap_good 'apparmor' 'enabled and tools installed'
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else
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wrap_bad 'apparmor' 'enabled, but apparmor_parser missing'
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echo -n ' '
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if command -v apt-get &>/dev/null; then
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wrap_color '(use "apt-get install apparmor" to fix this)' yellow
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elif command -v yum &>/dev/null; then
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wrap_color '(your best bet is "yum install apparmor-parser")' yellow
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else
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wrap_color '(look for an "apparmor" package for your distribution)' yellow
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fi
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fi
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fi
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flags=(
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NAMESPACES {NET,PID,IPC,UTS}_NS
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CGROUPS CGROUP_CPUACCT CGROUP_DEVICE CGROUP_FREEZER CGROUP_SCHED CPUSETS MEMCG
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KEYS
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VETH BRIDGE BRIDGE_NETFILTER
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IP_NF_FILTER IP_NF_TARGET_MASQUERADE
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NETFILTER_XT_MATCH_{ADDRTYPE,COMMENT,CONNTRACK,IPVS}
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IP_NF_NAT NF_NAT
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# required for bind-mounting /dev/mqueue into containers
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POSIX_MQUEUE
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# Most containers use overlayfs, and now runc itself uses it.
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OVERLAY_FS
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)
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check_flags "${flags[@]}"
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# Linux kernel commit 3007098494be.
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if kernel_ge 4 10 && [ $cgroup = "v2" ]; then
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check_flags CGROUP_BPF
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fi
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# Linux kernel commit 3bf195ae6037.
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if kernel_lt 5 1; then
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check_flags NF_NAT_IPV4
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fi
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# Linux kernel commit 4806e975729f99c7.
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if kernel_lt 5 2; then
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check_flags NF_NAT_NEEDED
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fi
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echo
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echo 'Optional Features:'
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{
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check_flags USER_NS
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check_distro_userns
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check_flags SECCOMP
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check_flags SECCOMP_FILTER
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check_flags CGROUP_PIDS
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# Linux kernel commit e55b9f96860f.
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if kernel_lt 6 1; then
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check_flags MEMCG_SWAP
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fi
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# Linux kernel commit 2d1c498072de.
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if kernel_lt 5 8; then
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check_flags MEMCG_SWAP_ENABLED
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if is_set MEMCG_SWAP && ! is_set MEMCG_SWAP_ENABLED; then
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wrap_color ' (note that cgroup swap accounting is not enabled in your kernel config, you can enable it by setting boot option "swapaccount=1")' bold black
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fi
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fi
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}
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# Linux kernel commit d886f4e483ce.
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if kernel_lt 4 5; then
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check_flags MEMCG_KMEM
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fi
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# Linux kernel commit 5b1efc027c0b.
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if kernel_lt 3 19; then
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check_flags RESOURCE_COUNTERS
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fi
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# Linux kernel commit 86f8515f9721.
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if kernel_lt 3 14; then
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netprio=NETPRIO_CGROUP
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else
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netprio=CGROUP_NET_PRIO
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fi
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# Linux kernel commit f382fb0bcef4.
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if kernel_lt 5 0; then
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check_flags IOSCHED_CFQ CFQ_GROUP_IOSCHED
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fi
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# Linux kernel commit 7caa47151ab2.
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if kernel_ge 5 4; then
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check_flags BLK_CGROUP_IOCOST
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fi
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flags=(
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BLK_CGROUP BLK_DEV_THROTTLING
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CGROUP_PERF
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CGROUP_HUGETLB
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NET_CLS_CGROUP "$netprio"
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CFS_BANDWIDTH FAIR_GROUP_SCHED RT_GROUP_SCHED
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IP_NF_TARGET_REDIRECT
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IP_VS
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IP_VS_NFCT
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IP_VS_PROTO_TCP
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IP_VS_PROTO_UDP
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IP_VS_RR
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SECURITY_SELINUX
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SECURITY_APPARMOR
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CHECKPOINT_RESTORE
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)
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check_flags "${flags[@]}"
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