kvm-host: reorganize code for kvmstats
* add -V|--version flag * add -h|--help flag * normalize options parsing
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@ -2,97 +2,202 @@
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VERSION="21.10"
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PROGNAME=$(basename "$0")
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show_version() {
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cat <<END
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${PROGNAME} version ${VERSION}
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Copyright 2018-2021 Evolix <info@evolix.fr>,
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Alexis Ben Miloud--Josselin <abenmiloud@evolix.fr>,
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Jérémy Lecour <jlecour@evolix.fr>
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and others.
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${PROGNAME} comes with ABSOLUTELY NO WARRANTY. This is free software,
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and you are welcome to redistribute it under certain conditions.
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See the GNU General Public Licence for details.
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END
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}
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show_help() {
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cat <<END
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${PROGNAME} print stats about configured virtal servers
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END
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show_usage
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}
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show_usage() {
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cat <<END
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Usage: ${PROGNAME} --all
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or ${PROGNAME} --output <human|html|csv>
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or ${PROGNAME} --units <k|m|g>
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END
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}
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error () {
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echo "$0": "$@" >&2
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exit 1
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}
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usage () {
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echo 'usage:' "$0" '[-a] [-u k|m|g] [-o human|html|csv]' >&2
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exit 1
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main() {
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for VM in $(virsh list --name --all)
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do
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echo "$VM"
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# cpu
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virsh vcpucount --current "$VM"
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# mem
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# libvirt stores memory in KiB, POW must be lowered by 1
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virsh dommemstat "$VM" 2>/dev/null | awk 'BEGIN{ret=1}$1~/^actual$/{print $2 / '$((POW / 1024))';ret=0}END{exit ret}' ||
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virsh dumpxml "$VM" | awk -F'[<>]' '$2~/^memory unit/{print $3/'$((POW / 1024))'}'
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# disk
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for BLK in $(virsh domblklist "$VM" | sed '1,2d;/-$/d;/^$/d' | awk '{print $1}')
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do
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virsh domblkinfo "$VM" "$BLK" 2>/dev/null
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done | awk '/Physical:/ { size += $2 } END { print int(size / '${POW}') }'
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# state
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virsh domstate "$VM" | grep -q '^running$' && echo yes || echo no
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done | xargs -n5 | {
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echo vm vcpu ram disk running
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awk '{ print } /yes$/ { vcpu += $2; ram += $3; disk += $4; running++ } END { print "TOTAL(running)", vcpu, ram, disk, running }'
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test "$SHOW_AVAIL" && {
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nproc
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awk '/^MemTotal:/ { print int($2 / '$((POW / 1024))' ) }' /proc/meminfo
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} | xargs -r printf 'AVAILABLE %s %s %s %s\n'
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} | case "$FMT" in
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'human')
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column -t
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;;
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'html')
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awk 'BEGIN{print "<html><body>\n<table>"}{printf "<tr>";for(i=1;i<=NF;i++)printf "<td>%s</td>", $i;print "</tr>"}END{print "</table>\n</body></html>"}'
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;;
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'csv')
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tr ' ' ','
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;;
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esac
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}
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parse_units() {
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case "$1" in
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'k')
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POW="$(echo '1024 ^ 1' | bc)"
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;;
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'm')
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POW="$(echo '1024 ^ 2' | bc)"
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;;
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'g')
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POW="$(echo '1024 ^ 3' | bc)"
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;;
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*)
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printf 'ERROR: Unknown unit value: %s. Possible values: %s\n' "$1" "k, m, g" >&2
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echo "" >&2
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show_usage >&2
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exit 1
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;;
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esac
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}
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parse_output() {
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case "$1" in
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'csv'|'html'|'human')
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FMT="$1"
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;;
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*)
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printf 'ERROR: Unknown output value : %s. Possible values: %s\n' "$1" "csv, html, human" >&2
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echo "" >&2
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show_usage >&2
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exit 1
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;;
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esac
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}
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# Check dependencies
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for DEP in bc virsh
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do
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command -v "$DEP" > /dev/null || error "$DEP" 'command not found'
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done
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# default values
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POW="$(echo '1024 ^ 3' | bc)"
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FMT='human'
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while [ "$#" -ne 0 ]
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do
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case "$1" in
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'-a')
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SHOW_AVAIL='y'
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;;
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'-o')
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case "$2" in
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'csv'|'html'|'human')
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FMT="$2"
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# Parse options
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# based on https://gist.github.com/deshion/10d3cb5f88a21671e17a
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while :; do
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case $1 in
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-h|-\?|--help)
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show_help
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exit 0
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;;
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-V|--version)
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show_version
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exit 0
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;;
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-a|--all)
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SHOW_AVAIL='y'
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;;
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-u|--units)
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# with value separated by space
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if [ -n "$2" ]; then
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parse_units "$2"
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shift
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else
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printf 'ERROR: "-u|--units" requires a non-empty option argument.\n' >&2
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exit 1
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fi
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;;
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--units=?*)
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# with value speparated by =
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parse_units ${1#*=}
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;;
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--units=)
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# without value
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printf 'ERROR: "--units" requires a non-empty option argument.\n' >&2
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exit 1
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;;
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-o|--output)
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# with value separated by space
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if [ -n "$2" ]; then
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parse_output "$2"
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shift
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else
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printf 'ERROR: "-o|--output" requires a non-empty option argument.\n' >&2
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exit 1
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fi
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;;
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--output=?*)
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# with value speparated by =
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parse_output ${1#*=}
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;;
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--output=)
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# without value
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printf 'ERROR: "--output" requires a non-empty option argument.\n' >&2
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exit 1
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;;
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--)
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# End of all options.
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shift
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break
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;;
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-?*|[[:alnum:]]*)
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# ignore unknown options
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printf 'ERROR: Unknown option : %s\n' "$1" >&2
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echo "" >&2
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show_usage >&2
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exit 1
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;;
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*)
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usage
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# Default case: If no more options then break out of the loop.
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break
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;;
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esac
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shift
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;;
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'-u')
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case "$2" in
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'k')
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POW="$(echo '1024 ^ 1' | bc)"
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;;
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'm')
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POW="$(echo '1024 ^ 2' | bc)"
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;;
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'g')
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POW="$(echo '1024 ^ 3' | bc)"
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;;
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*)
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usage
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esac
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shift
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;;
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*)
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usage
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esac
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shift
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done
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for VM in $(virsh list --name --all)
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do
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echo "$VM"
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main
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# cpu
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virsh vcpucount --current "$VM"
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# mem
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# libvirt stores memory in KiB, POW must be lowered by 1
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virsh dommemstat "$VM" 2>/dev/null | awk 'BEGIN{ret=1}$1~/^actual$/{print $2 / '$((POW / 1024))';ret=0}END{exit ret}' ||
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virsh dumpxml "$VM" | awk -F'[<>]' '$2~/^memory unit/{print $3/'$((POW / 1024))'}'
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# disk
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for BLK in $(virsh domblklist "$VM" | sed '1,2d;/-$/d;/^$/d' | awk '{print $1}')
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do
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virsh domblkinfo "$VM" "$BLK" 2>/dev/null
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done | awk '/Physical:/ { size += $2 } END { print int(size / '${POW}') }'
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# state
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virsh domstate "$VM" | grep -q '^running$' && echo yes || echo no
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done | xargs -n5 | {
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echo vm vcpu ram disk running
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awk '{ print } /yes$/ { vcpu += $2; ram += $3; disk += $4; running++ } END { print "TOTAL(running)", vcpu, ram, disk, running }'
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test "$SHOW_AVAIL" && {
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nproc
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awk '/^MemTotal:/ { print int($2 / '$((POW / 1024))' ) }' /proc/meminfo
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} | xargs -r printf 'AVAILABLE %s %s %s %s\n'
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} | case "$FMT" in
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'human')
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column -t
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;;
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'html')
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awk 'BEGIN{print "<html><body>\n<table>"}{printf "<tr>";for(i=1;i<=NF;i++)printf "<td>%s</td>", $i;print "</tr>"}END{print "</table>\n</body></html>"}'
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;;
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'csv')
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tr ' ' ','
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;;
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esac
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