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|
#!/usr/bin/env bash
set -e
# bits of this were adapted from lxc-checkconfig
# see also https://github.com/lxc/lxc/blob/lxc-1.0.2/src/lxc/lxc-checkconfig.in
: ${CONFIG:=/proc/config.gz}
if ! command -v zgrep &> /dev/null; then
zgrep() {
zcat "$2" | grep "$1"
}
fi
is_set() {
zgrep "CONFIG_$1=[y|m]" "$CONFIG" > /dev/null
}
# see http://en.wikipedia.org/wiki/ANSI_escape_code#Colors
declare -A colors=(
[black]=30
[red]=31
[green]=32
[yellow]=33
[blue]=34
[magenta]=35
[cyan]=36
[white]=37
)
color() {
color=()
if [ "$1" = 'bold' ]; then
color+=( '1' )
shift
fi
if [ $# -gt 0 ] && [ "${colors[$1]}" ]; then
color+=( "${colors[$1]}" )
fi
local IFS=';'
echo -en '\033['"${color[*]}"m
}
wrap_color() {
text="$1"
shift
color "$@"
echo -n "$text"
color reset
echo
}
wrap_good() {
echo "$(wrap_color "$1" white): $(wrap_color "$2" green)"
}
wrap_bad() {
echo "$(wrap_color "$1" bold): $(wrap_color "$2" bold red)"
}
wrap_warning() {
wrap_color >&2 "$*" red
}
check_flag() {
if is_set "$1"; then
wrap_good "CONFIG_$1" 'enabled'
else
wrap_bad "CONFIG_$1" 'missing'
fi
}
check_flags() {
for flag in "$@"; do
echo "- $(check_flag "$flag")"
done
}
if [ ! -e "$CONFIG" ]; then
wrap_warning "warning: $CONFIG does not exist, searching other paths for kernel config..."
for tryConfig in \
'/proc/config.gz' \
"/boot/config-$(uname -r)" \
'/usr/src/linux/.config' \
; do
if [ -e "$tryConfig" ]; then
CONFIG="$tryConfig"
break
fi
done
if [ ! -e "$CONFIG" ]; then
wrap_warning "error: cannot find kernel config"
wrap_warning " try running this script again, specifying the kernel config:"
wrap_warning " CONFIG=/path/to/kernel/.config $0"
exit 1
fi
fi
wrap_color "info: reading kernel config from $CONFIG ..." white
echo
echo 'Generally Necessary:'
echo -n '- '
cgroupCpuDir="$(awk '/[, ]cpu([, ]|$)/ && $8 == "cgroup" { print $5 }' /proc/$$/mountinfo | head -n1)"
cgroupDir="$(dirname "$cgroupCpuDir")"
if [ -d "$cgroupDir/cpu" ]; then
echo "$(wrap_good 'cgroup hierarchy' 'properly mounted') [$cgroupDir]"
else
echo "$(wrap_bad 'cgroup hierarchy' 'single mountpoint!') [$cgroupCpuDir]"
echo " $(wrap_color '(see https://github.com/tianon/cgroupfs-mount)' yellow)"
fi
flags=(
NAMESPACES {NET,PID,IPC,UTS}_NS
DEVPTS_MULTIPLE_INSTANCES
CGROUPS CGROUP_DEVICE
MACVLAN VETH BRIDGE
IP_NF_TARGET_MASQUERADE NETFILTER_XT_MATCH_{ADDRTYPE,CONNTRACK}
NF_NAT NF_NAT_NEEDED
)
check_flags "${flags[@]}"
echo
echo 'Optional Features:'
flags=(
MEMCG_SWAP
RESOURCE_COUNTERS
)
check_flags "${flags[@]}"
echo '- Storage Drivers:'
{
echo '- "'$(wrap_color 'aufs' blue)'":'
check_flags AUFS_FS | sed 's/^/ /'
if ! is_set AUFS_FS && grep -q aufs /proc/filesystems; then
echo " $(wrap_color '(note that some kernels include AUFS patches but not the AUFS_FS flag)' bold black)"
fi
echo '- "'$(wrap_color 'btrfs' blue)'":'
check_flags BTRFS_FS | sed 's/^/ /'
echo '- "'$(wrap_color 'devicemapper' blue)'":'
check_flags BLK_DEV_DM DM_THIN_PROVISIONING EXT4_FS | sed 's/^/ /'
} | sed 's/^/ /'
echo
#echo 'Potential Future Features:'
#check_flags USER_NS
#echo
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