diff options
Diffstat (limited to 'cloudinit')
| -rw-r--r-- | cloudinit/config/cc_power_state_change.py | 57 |
1 files changed, 51 insertions, 6 deletions
diff --git a/cloudinit/config/cc_power_state_change.py b/cloudinit/config/cc_power_state_change.py index 09d37371..7d9567e3 100644 --- a/cloudinit/config/cc_power_state_change.py +++ b/cloudinit/config/cc_power_state_change.py @@ -22,6 +22,7 @@ from cloudinit import util import errno import os import re +import six import subprocess import time @@ -48,10 +49,40 @@ def givecmdline(pid): return None +def check_condition(cond, log=None): + if isinstance(cond, bool): + if log: + log.debug("Static Condition: %s" % cond) + return cond + + pre = "check_condition command (%s): " % cond + try: + proc = subprocess.Popen(cond, shell=not isinstance(cond, list)) + proc.communicate() + ret = proc.returncode + if ret == 0: + if log: + log.debug(pre + "exited 0. condition met.") + return True + elif ret == 1: + if log: + log.debug(pre + "exited 1. condition not met.") + return False + else: + if log: + log.warn(pre + "unexpected exit %s. " % ret + + "do not apply change.") + return False + except Exception as e: + if log: + log.warn(pre + "Unexpected error: %s" % e) + return False + + def handle(_name, cfg, _cloud, log, _args): try: - (args, timeout) = load_power_state(cfg) + (args, timeout, condition) = load_power_state(cfg) if args is None: log.debug("no power_state provided. doing nothing") return @@ -59,6 +90,10 @@ def handle(_name, cfg, _cloud, log, _args): log.warn("%s Not performing power state change!" % str(e)) return + if condition is False: + log.debug("Condition was false. Will not perform state change.") + return + mypid = os.getpid() cmdline = givecmdline(mypid) @@ -70,8 +105,8 @@ def handle(_name, cfg, _cloud, log, _args): log.debug("After pid %s ends, will execute: %s" % (mypid, ' '.join(args))) - util.fork_cb(run_after_pid_gone, mypid, cmdline, timeout, log, execmd, - [args, devnull_fp]) + util.fork_cb(run_after_pid_gone, mypid, cmdline, timeout, log, + condition, execmd, [args, devnull_fp]) def load_power_state(cfg): @@ -80,7 +115,7 @@ def load_power_state(cfg): pstate = cfg.get('power_state') if pstate is None: - return (None, None) + return (None, None, None) if not isinstance(pstate, dict): raise TypeError("power_state is not a dict.") @@ -115,7 +150,10 @@ def load_power_state(cfg): raise ValueError("failed to convert timeout '%s' to float." % pstate['timeout']) - return (args, timeout) + condition = pstate.get("condition", True) + if not isinstance(condition, six.string_types + (list, bool)): + raise TypeError("condition type %s invalid. must be list, bool, str") + return (args, timeout, condition) def doexit(sysexit): @@ -133,7 +171,7 @@ def execmd(exe_args, output=None, data_in=None): doexit(ret) -def run_after_pid_gone(pid, pidcmdline, timeout, log, func, args): +def run_after_pid_gone(pid, pidcmdline, timeout, log, condition, func, args): # wait until pid, with /proc/pid/cmdline contents of pidcmdline # is no longer alive. After it is gone, or timeout has passed # execute func(args) @@ -175,4 +213,11 @@ def run_after_pid_gone(pid, pidcmdline, timeout, log, func, args): if log: log.debug(msg) + + try: + if not check_condition(condition, log): + return + except Exception as e: + fatal("Unexpected Exception when checking condition: %s" % e) + func(*args) |