245 lines
6.3 KiB
Bash
Executable file
245 lines
6.3 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -e
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# bits of this were adapted from lxc-checkconfig
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# see also https://github.com/lxc/lxc/blob/lxc-1.0.2/src/lxc/lxc-checkconfig.in
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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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if [ $# -gt 0 ]; then
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CONFIG="$1"
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else
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: ${CONFIG:="${possibleConfigs[0]}"}
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fi
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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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# see https://en.wikipedia.org/wiki/ANSI_escape_code#Colors
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declare -A colors=(
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[black]=30
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[red]=31
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[green]=32
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[yellow]=33
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[blue]=34
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[magenta]=35
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[cyan]=36
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[white]=37
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)
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color() {
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color=()
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if [ "$1" = 'bold' ]; then
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color+=( '1' )
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shift
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fi
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if [ $# -gt 0 ] && [ "${colors[$1]}" ]; then
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color+=( "${colors[$1]}" )
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fi
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local IFS=';'
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echo -en '\033['"${color[*]}"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_command() {
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if command -v "$1" >/dev/null 2>&1; then
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wrap_good "$1 command" 'available'
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else
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wrap_bad "$1 command" 'missing'
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fi
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}
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check_device() {
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if [ -c "$1" ]; then
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wrap_good "$1" 'present'
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else
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wrap_bad "$1" 'missing'
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fi
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}
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if [ ! -e "$CONFIG" ]; then
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wrap_warning "warning: $CONFIG does not exist, searching other paths for kernel config ..."
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for tryConfig in "${possibleConfigs[@]}"; do
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if [ -e "$tryConfig" ]; then
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CONFIG="$tryConfig"
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break
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fi
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done
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if [ ! -e "$CONFIG" ]; then
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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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fi
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fi
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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 "$(wrap_color '(look for an "apparmor" package for your distribution)')"
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fi
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fi
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fi
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flags=(
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NAMESPACES {NET,PID,IPC,UTS}_NS
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DEVPTS_MULTIPLE_INSTANCES
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CGROUPS CGROUP_CPUACCT CGROUP_DEVICE CGROUP_FREEZER CGROUP_SCHED CPUSETS MEMCG
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MACVLAN VETH BRIDGE BRIDGE_NETFILTER
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NF_NAT_IPV4 IP_NF_FILTER IP_NF_TARGET_MASQUERADE
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NETFILTER_XT_MATCH_{ADDRTYPE,CONNTRACK}
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NF_NAT NF_NAT_NEEDED
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# required for bind-mounting /dev/mqueue into containers
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POSIX_MQUEUE
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)
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check_flags "${flags[@]}"
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echo
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echo 'Optional Features:'
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{
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check_flags MEMCG_KMEM 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 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 IOSCHED_CFQ BLK_DEV_THROTTLING
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CGROUP_PERF
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CGROUP_HUGETLB
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NET_CLS_CGROUP $netprio
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CFS_BANDWIDTH FAIR_GROUP_SCHED RT_GROUP_SCHED
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)
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check_flags "${flags[@]}"
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check_flags EXT3_FS EXT3_FS_XATTR EXT3_FS_POSIX_ACL EXT3_FS_SECURITY
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if ! is_set EXT3_FS || ! is_set EXT3_FS_XATTR || ! is_set EXT3_FS_POSIX_ACL || ! is_set EXT3_FS_SECURITY; then
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echo " $(wrap_color '(enable these ext3 configs if you are using ext3 as backing filesystem)' bold black)"
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fi
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check_flags EXT4_FS EXT4_FS_POSIX_ACL EXT4_FS_SECURITY
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if ! is_set EXT4_FS || ! is_set EXT4_FS_POSIX_ACL || ! is_set EXT4_FS_SECURITY; then
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echo " $(wrap_color 'enable these ext4 configs if you are using ext4 as backing filesystem' bold black)"
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fi
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echo '- Storage Drivers:'
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{
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echo '- "'$(wrap_color 'aufs' blue)'":'
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check_flags AUFS_FS | sed 's/^/ /'
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if ! is_set AUFS_FS && grep -q aufs /proc/filesystems; then
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echo " $(wrap_color '(note that some kernels include AUFS patches but not the AUFS_FS flag)' bold black)"
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fi
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echo '- "'$(wrap_color 'btrfs' blue)'":'
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check_flags BTRFS_FS | sed 's/^/ /'
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echo '- "'$(wrap_color 'devicemapper' blue)'":'
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check_flags BLK_DEV_DM DM_THIN_PROVISIONING | sed 's/^/ /'
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echo '- "'$(wrap_color 'overlay' blue)'":'
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check_flags OVERLAY_FS | sed 's/^/ /'
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echo '- "'$(wrap_color 'zfs' blue)'":'
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echo " - $(check_device /dev/zfs)"
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echo " - $(check_command zfs)"
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echo " - $(check_command zpool)"
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} | sed 's/^/ /'
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echo
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#echo 'Potential Future Features:'
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#check_flags USER_NS
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#echo
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