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