247 lines
6.1 KiB
Bash
Executable file
247 lines
6.1 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -e
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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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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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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 "$text"
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color reset
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echo
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}
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wrap_good() {
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echo "$(wrap_color "$1" white): $(wrap_color "$2" green)"
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}
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wrap_bad() {
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echo "$(wrap_color "$1" bold): $(wrap_color "$2" bold red)"
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}
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wrap_warning() {
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wrap_color >&2 "$*" 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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source /etc/os-release 2>/dev/null || /bin/true
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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="$1"
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[[ "$target_dir" ]] || target_dir=("${possibleConfigs[@]}")
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local tryConfig
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for tryConfig in "${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 $CONFIG ..." white
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echo
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echo 'Generally Necessary:'
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echo -n '- '
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cgroupSubsystemDir="$(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" -o -d "$cgroupDir/cpuacct" -o -d "$cgroupDir/cpuset" -o -d "$cgroupDir/devices" -o -d "$cgroupDir/freezer" -o -d "$cgroupDir/memory" ]; then
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echo "$(wrap_good 'cgroup hierarchy' 'properly mounted') [$cgroupDir]"
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else
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if [ "$cgroupSubsystemDir" ]; then
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echo "$(wrap_bad 'cgroup hierarchy' 'single mountpoint!') [$cgroupSubsystemDir]"
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else
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echo "$(wrap_bad 'cgroup hierarchy' 'nonexistent??')"
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fi
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echo " $(wrap_color '(see https://github.com/tianon/cgroupfs-mount)' yellow)"
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fi
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if [ "$(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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echo "$(wrap_good 'apparmor' 'enabled and tools installed')"
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else
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echo "$(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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echo "$(wrap_color '(use "apt-get install apparmor" to fix this)')"
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elif command -v yum &>/dev/null; then
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echo "$(wrap_color '(your best bet is "yum install apparmor-parser")')"
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else
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echo "$(wrap_color '(look for an "apparmor" package for your distribution)')"
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fi
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fi
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fi
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flags=(
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NAMESPACES {NET,PID,IPC,UTS}_NS
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CGROUPS CGROUP_CPUACCT CGROUP_DEVICE CGROUP_FREEZER CGROUP_SCHED CPUSETS MEMCG
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KEYS
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MACVLAN VETH BRIDGE BRIDGE_NETFILTER
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NF_NAT_IPV4 IP_NF_FILTER IP_NF_TARGET_MASQUERADE
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NETFILTER_XT_MATCH_{ADDRTYPE,CONNTRACK}
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NF_NAT NF_NAT_NEEDED
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# required for bind-mounting /dev/mqueue into containers
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POSIX_MQUEUE
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)
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check_flags "${flags[@]}"
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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 CGROUP_PIDS
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check_flags MEMCG_SWAP MEMCG_SWAP_ENABLED
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if is_set MEMCG_SWAP && ! is_set MEMCG_SWAP_ENABLED; then
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echo " $(wrap_color '(note that cgroup swap accounting is not enabled in your kernel config, you can enable it by setting boot option "swapaccount=1")' bold black)"
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fi
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}
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if [ "$kernelMajor" -lt 4 ] || [ "$kernelMajor" -eq 4 -a "$kernelMinor" -le 5 ]; then
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check_flags MEMCG_KMEM
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fi
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if [ "$kernelMajor" -lt 3 ] || [ "$kernelMajor" -eq 3 -a "$kernelMinor" -le 18 ]; then
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check_flags RESOURCE_COUNTERS
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fi
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if [ "$kernelMajor" -lt 3 ] || [ "$kernelMajor" -eq 3 -a "$kernelMinor" -le 13 ]; 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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flags=(
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BLK_CGROUP BLK_DEV_THROTTLING IOSCHED_CFQ CFQ_GROUP_IOSCHED
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CGROUP_PERF
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CGROUP_HUGETLB
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NET_CLS_CGROUP $netprio
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CFS_BANDWIDTH FAIR_GROUP_SCHED RT_GROUP_SCHED
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)
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check_flags "${flags[@]}"
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