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#!/bin/bash
set -e
PROGNAME="$0"
config=
temphumd_host=
temphumd_port=
declare -a values
die() {
>&2 echo "error: $@"
exit 1
}
read_config() {
local config_file="$1"
local words
local temp
local freq
local line
local n
n=0
while read line; do
n=$(( n+1 ))
# skip empty lines or comments
if [ -z "$line" ] || [[ "$line" =~ ^#.* ]]; then
continue
fi
if [ -z "$temphumd_host" ] || [ -z "$temphumd_port" ]; then
temphumd_host=$(extract_ip "$line")
temphumd_port=$(extract_port "$line")
else
words=($line)
temp=${words[0]}
freq=${words[1]}
if [ -z "$temp" ] || [ -z "$freq" ]; then
die "config: line $n is invalid"
fi
values[$temp]=$freq
fi
done < <(cat "$config_file")
}
extract_ip() {
echo "$1" | sed -e 's/:.*$//g'
}
extract_port() {
echo "$1" | sed -e 's/^.*://g'
}
usage() {
cat <<-_EOF
usage: $PROGNAME [OPTIONS] COMMAND
Options:
-c|--config CONFIG
_EOF
exit 1
}
[[ $# -lt 1 ]] && usage
while [[ $# -gt 0 ]]; do
case $1 in
-c|--config)
config="$2"
shift; shift
;;
*)
die "unrecognized option $1"
exit 1
;;
esac
done
[ -z "$config" ] && die "missing required -c or --config"
read_config "$config"
# reading temperature from temphumd server
exec 3<>/dev/tcp/$temphumd_host/$temphumd_port
echo -n "read" >&3
read -t 5 response <&3
envtemp=$(echo "$response" | jq ".temp" | awk "{print int(\$1+0.5)}")
[ -z "$envtemp" ] && die "failed to read environment temperature"
# setting corresponding cpu freq
while read temp; do
freq=${values[$temp]}
(( envtemp >= temp )) && break
done < <(for temp in ${!values[@]}; do echo $temp; done | sort -rn)
echo -n "$freq" > /sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq
logger -t "$(basename "$PROGNAME")" "Environment temperature is $envtemp C, set max CPU frequency to $freq."
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