Get FreeNAS system temperatures in InfluxDB format

freenas-disk-temp.py

#!/usr/bin/env python

import os
import re
import subprocess

def cpuTemp(hostname):
    sysctl = subprocess.Popen(['/sbin/sysctl', '-a'],stdout=subprocess.PIPE)
    while True:
        line = sysctl.stdout.readline()
        if line != '':
            if 'cpu' in line and 'temp' in line:
                search = re.search('.*cpu\.([0-9]+)\.temp.* ([0-9]+\.[0-9]+)C', line)
                cpu = search.group(1)
                temp = search.group(2)
                print "temperature,host=" + hostname + ",type=cpu,cpu=" + cpu + " temperature=" + temp
        else:
            break

def diskTemp(hostname):
    for disk in listDisks():
        if 'ada' in disk:
            sysctl = subprocess.Popen(['/usr/local/sbin/smartctl', '-iA', '-n', 'standby', '/dev/'+disk], stdout=subprocess.PIPE)
            while True:
                line = sysctl.stdout.readline()
                if line != '':
                    if 'Serial Number' in line:
                        serial = line.split()[2]
                    if 'Temperature_Celsius' in line:
                        temp = str(float(line.split()[9]))
                else:
                    print "temperature,host=" + hostname + ",type=disk,disk=" + serial + " temperature=" + temp
                    break

def listDisks():
    sysctl = subprocess.Popen(['/sbin/sysctl', '-n', 'kern.disks'],stdout=subprocess.PIPE)
    while True:
        line = sysctl.stdout.readline()
        if line != '':
            return line.split()
        else:
            break
            
def main():
    hostname = os.uname()[1]

    cpuTemp(hostname)
    diskTemp(hostname)

if __name__ == "__main__":
    main()

I expanded on your code to write the HDD temps to an InfluxDB database.

https://gist.github.com/scottklarr/34996645b824ad7a02b3d42a1718b186

@scottklarr nice! The intention was for this script to be used by the exec method in telegraf which would do that for you.