ipmi-dcmi.plugin

#!/usr/bin/env sh

set -u
export LC_ALL=C

# Reexec'ing myself as root
if [[ "$(id -u)" != "0" ]]; then
	# Check with sudo
	if ! [[ -r /dev/ipmi0 ]] && ! type -P sudo >/dev/null; then
		echo >&2 "You need sudo to reexec this script as root for ipmi access"
		exit 1
	fi
	#
	exec sudo --non-interactive "$(realpath $0)" "$@"
fi


# Default sampling to 5 seconds. Can do lower
sampling="${1:-2}"

# Maximum number of process in sleep mode
processThreshold="10"

# Use timeout if available
timeoutCmd="$(type -P timeout)"
timeoutCmd+="${timeoutCmd:+ $sampling}"



# Check for mandatory bins
if ! type -P ipmi-dcmi >/dev/null; then
	echo >&2 "No binary ipmi-dcmi available in '${PATH//:/ }'"
	exit 1
fi

ipmiCmd="ipmi-dcmi --get-system-power-statistics"

# will launch in background to avoid too heavy sampling drift
while sleep $sampling; do
	$ipmiCmd &

	# Security for avoid too many forks shall IPMI fail
	if [[ "$(jobs -lp|wc -l)" -gt $processThreshold ]]; then
		echo >&2 "More than $processThreshold proc in background. Try lowering the sampling rate"
		# Exiting in hope process will clean themselves and netdata will restart us
		exit 0
	fi

done | awk '
	# First call, generate the graph definition
	NR == 1 { 
		print "CHART ipmi.power \"\" \"Power Consumption\" \"Watts\" ipmi-dcmi.plugin ipmi.power line 100000 '$sampling'"
		print "DIMENSION dcmi \"\" absolute 1 1"
	}
	$1$2 == "CurrentPower" {
		print "BEGIN ipmi.power"
		print "SET dcmi = "$4
		print "END"
		fflush()
	}
'