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fence_rcd_serial.py
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#!@PYTHON@ -tt
# Copyright 2018 Infoxchange, Danielle Madeley, Sam McLeod-Jones
# Controls an RCD serial device
# Ported from stonith/rcd_serial.c
# The Following Agent Has Been Tested On:
# CentOS Linux release 7.5.1804
# Resource example:
# primitive stonith_node_1 ocf:rcd_serial_py params port="/dev/ttyS0" time=1000 hostlist=stonith_node_1 stonith-timeout=5s
import sys
import atexit
import os
import struct
import logging
import time
from fcntl import ioctl
from termios import TIOCMBIC, TIOCMBIS, TIOCM_RTS, TIOCM_DTR
from time import sleep
sys.path.append("@FENCEAGENTSLIBDIR@")
from fencing import *
class RCDSerial(object):
"""Control class for serial device"""
def __init__(self, port='/dev/ttyS0'):
self.fd = fd = os.open(port, os.O_RDONLY | os.O_NDELAY)
logging.debug("Opened %s on fd %i", port, fd)
ioctl(fd, TIOCMBIC, struct.pack('I', TIOCM_RTS | TIOCM_DTR))
def close(self):
"""Close the serial device"""
logging.debug("Closing serial device")
ret = os.close(self.fd)
return ret
def toggle_pin(self, pin=TIOCM_DTR, time=1000):
"""Toggle the pin high for the time specified"""
logging.debug("Set pin high")
ioctl(self.fd, TIOCMBIS, struct.pack('I', pin))
sleep(float(time) / 1000.)
logging.debug("Set pin low")
ioctl(self.fd, TIOCMBIC, struct.pack('I', pin))
def reboot_device(conn, options):
conn.toggle_pin(time=options["--power-wait"])
return True
def main():
device_opt = ["serial_port", "no_status", "no_password", "no_login", "method", "no_on", "no_off"]
atexit.register(atexit_handler)
all_opt["serial_port"] = {
"getopt" : ":",
"longopt" : "serial-port",
"help":"--serial-port=[port] Port of the serial device (e.g. /dev/ttyS0)",
"required" : "1",
"shortdesc" : "Port of the serial device",
"default" : "/dev/ttyS0",
"order": 1
}
all_opt["method"]["default"] = "cycle"
all_opt["power_wait"]["default"] = "2"
all_opt["method"]["help"] = "-m, --method=[method] Method to fence (onoff|cycle) (Default: cycle)"
options = check_input(device_opt, process_input(device_opt))
docs = {}
docs["shortdesc"] = "rcd_serial fence agent"
docs["longdesc"] = "fence_rcd_serial operates a serial cable that toggles a \
reset of an opposing server using the reset switch on its motherboard. The \
cable itself is simple with no power, network or moving parts. An example of \
the cable is available here: https://smcleod.net/rcd-stonith/ and the circuit \
design is available in the fence-agents src as SVG"
docs["vendorurl"] = "https://github.com/sammcj/fence_rcd_serial"
show_docs(options, docs)
if options["--action"] in ["off", "reboot"]:
time.sleep(int(options["--delay"]))
## Operate the fencing device
conn = RCDSerial(port=options["--serial-port"])
result = fence_action(conn, options, None, None, reboot_cycle_fn=reboot_device)
conn.close()
sys.exit(result)
if __name__ == "__main__":
main()

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