contrib/check-config.sh: Make script POSIX
On systems that do not have bash, the current bash-based check-config.sh won't run. Making check-config.sh a POSIX shell script instead makes it more portable. Signed-off-by: Joakim Roubert <joakim.roubert@axis.com>
This commit is contained in:
Joakim Roubert
parent
e02bc91dcb
commit
1ce955ec83
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@ -1,4 +1,4 @@
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#!/usr/bin/env bash
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#!/usr/bin/env sh
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set -e
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EXITCODE=0
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@ -6,20 +6,20 @@ EXITCODE=0
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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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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:="${possibleConfigs[0]}"}"
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: "${CONFIG:=/proc/config.gz}"
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fi
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if ! command -v zgrep &> /dev/null; then
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if ! command -v zgrep > /dev/null 2>&1; then
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zgrep() {
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zcat "$2" | grep "$1"
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}
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@ -41,13 +41,13 @@ is_set_as_module() {
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}
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color() {
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local codes=()
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codes=
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if [ "$1" = 'bold' ]; then
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codes=("${codes[@]}" '1')
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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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code=
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case "$1" in
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# see https://en.wikipedia.org/wiki/ANSI_escape_code#Colors
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black) code=30 ;;
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@ -60,17 +60,20 @@ color() {
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white) code=37 ;;
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esac
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if [ "$code" ]; then
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codes=("${codes[@]}" "$code")
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[ "$codes" ] && codes="$codes "
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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['"${codes[*]}"'m'
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oldIFS=$IFS
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IFS=';'
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printf '\033[%sm' "$codes"
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IFS=$oldIFS
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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 "$text"
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printf '%s' "$text"
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color reset
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echo
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}
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@ -98,7 +101,7 @@ check_flag() {
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check_flags() {
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for flag in "$@"; do
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echo -n "- "
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printf -- '- '
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check_flag "$flag"
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done
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}
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@ -122,20 +125,26 @@ check_device() {
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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 [[ "${ID}" =~ ^(centos|rhel)$ && "${VERSION_ID}" =~ ^7 ]]; then
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# this is a CentOS7 or RHEL7 system
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grep -q "user_namespace.enable=1" /proc/cmdline || {
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# no user namespace support enabled
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wrap_bad " (RHEL7/CentOS7" "User namespaces disabled; add 'user_namespace.enable=1' to boot command line)"
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EXITCODE=1
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}
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fi
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. /etc/os-release 2> /dev/null || /bin/true
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case "$ID" in
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centos | rhel)
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case "$VERSION_ID" in
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7*)
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# this is a CentOS7 or RHEL7 system
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grep -q 'user_namespace.enable=1' /proc/cmdline || {
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# no user namespace support enabled
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wrap_bad " (RHEL7/CentOS7" "User namespaces disabled; add 'user_namespace.enable=1' to boot command line)"
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EXITCODE=1
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}
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;;
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esac
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;;
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esac
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}
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if [ ! -e "$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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for tryConfig in $possibleConfigs; do
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if [ -e "$tryConfig" ]; then
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CONFIG="$tryConfig"
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break
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@ -154,9 +163,9 @@ echo
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echo 'Generally Necessary:'
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echo -n '- '
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printf -- '- '
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if [ "$(stat -f -c %t /sys/fs/cgroup 2> /dev/null)" = '63677270' ]; then
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echo "$(wrap_good 'cgroup hierarchy' 'cgroupv2')"
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wrap_good 'cgroup hierarchy' 'cgroupv2'
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else
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cgroupSubsystemDir="$(awk '/[, ](cpu|cpuacct|cpuset|devices|freezer|memory)[, ]/ && $3 == "cgroup" { print $2 }' /proc/mounts | head -n1)"
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cgroupDir="$(dirname "$cgroupSubsystemDir")"
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@ -174,15 +183,15 @@ else
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fi
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if [ "$(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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printf -- '- '
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if command -v apparmor_parser > /dev/null 2>&1; 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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printf ' '
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if command -v apt-get > /dev/null 2>&1; then
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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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elif command -v yum > /dev/null 2>&1; then
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wrap_color '(your best bet is "yum install apparmor-parser")'
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else
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wrap_color '(look for an "apparmor" package for your distribution)'
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@ -191,20 +200,23 @@ if [ "$(cat /sys/module/apparmor/parameters/enabled 2> /dev/null)" = 'Y' ]; then
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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,CONNTRACK,IPVS}
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NETFILTER_XT_MARK
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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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check_flags \
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NAMESPACES NET_NS \
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NAMESPACES PID_NS \
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NAMESPACES IPC_NS \
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NAMESPACES 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 \
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NETFILTER_XT_MATCH_CONNTRACK \
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NETFILTER_XT_MATCH_IPVS \
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NETFILTER_XT_MARK \
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IP_NF_NAT NF_NAT \
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POSIX_MQUEUE
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)
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check_flags "${flags[@]}"
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# (POSIX_MQUEUE is required for bind-mounting /dev/mqueue into containers)
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if [ "$kernelMajor" -lt 4 ] || ([ "$kernelMajor" -eq 4 ] && [ "$kernelMinor" -lt 8 ]); then
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check_flags DEVPTS_MULTIPLE_INSTANCES
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fi
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@ -251,14 +263,14 @@ echo 'Optional Features:'
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}
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{
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if is_set LEGACY_VSYSCALL_NATIVE; then
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echo -n "- "
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printf -- '- '
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wrap_bad "CONFIG_LEGACY_VSYSCALL_NATIVE" 'enabled'
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echo " $(wrap_color '(dangerous, provides an ASLR-bypassing target with usable ROP gadgets.)' bold black)"
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elif is_set LEGACY_VSYSCALL_EMULATE; then
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echo -n "- "
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printf -- '- '
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wrap_good "CONFIG_LEGACY_VSYSCALL_EMULATE" 'enabled'
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elif is_set LEGACY_VSYSCALL_NONE; then
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echo -n "- "
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printf -- '- '
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wrap_bad "CONFIG_LEGACY_VSYSCALL_NONE" 'enabled'
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echo " $(wrap_color '(containers using eglibc <= 2.13 will not work. Switch to' bold black)"
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echo " $(wrap_color ' "CONFIG_VSYSCALL_[NATIVE|EMULATE]" or use "vsyscall=[native|emulate]"' bold black)"
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@ -289,22 +301,20 @@ if [ "$kernelMajor" -lt 5 ]; then
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check_flags IOSCHED_CFQ CFQ_GROUP_IOSCHED
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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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check_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 $netprio \
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CFS_BANDWIDTH FAIR_GROUP_SCHED RT_GROUP_SCHED \
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IP_NF_TARGET_REDIRECT \
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IP_VS \
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IP_VS_NFCT \
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IP_VS_PROTO_TCP \
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IP_VS_PROTO_UDP \
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IP_VS_RR \
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SECURITY_SELINUX \
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SECURITY_APPARMOR
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)
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check_flags "${flags[@]}"
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if ! is_set EXT4_USE_FOR_EXT2; then
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check_flags EXT3_FS EXT3_FS_XATTR EXT3_FS_POSIX_ACL EXT3_FS_SECURITY
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@ -369,11 +379,11 @@ check_flags OVERLAY_FS | sed 's/^/ /'
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EXITCODE=0
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echo " - \"$(wrap_color 'zfs' blue)\":"
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echo -n " - "
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printf ' - '
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check_device /dev/zfs
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echo -n " - "
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printf ' - '
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check_command zfs
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echo -n " - "
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printf ' - '
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check_command zpool
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[ "$EXITCODE" = 0 ] && STORAGE=0
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EXITCODE=0
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