From 0dcbc4b1714260820fd4b8d6536fbb05e139cc0f Mon Sep 17 00:00:00 2001 From: Ahmad Sharif Date: Thu, 2 Feb 2012 16:37:18 -0800 Subject: Synced repos to: 58208 --- lock_machine.py | 250 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 250 insertions(+) create mode 100755 lock_machine.py (limited to 'lock_machine.py') diff --git a/lock_machine.py b/lock_machine.py new file mode 100755 index 00000000..c5f98092 --- /dev/null +++ b/lock_machine.py @@ -0,0 +1,250 @@ +#!/usr/bin/python2.6 +# +# Copyright 2010 Google Inc. All Rights Reserved. + +"""Script to lock/unlock machines. + +""" + +__author__ = "asharif@google.com (Ahmad Sharif)" + +import datetime +import fcntl +import getpass +import glob +import optparse +import os +import pickle +import socket +import sys +import time +from utils import logger + + +class FileCreationMask(object): + def __init__(self, mask): + self._mask = mask + + def __enter__(self): + self._old_mask = os.umask(self._mask) + + def __exit__(self, type, value, traceback): + os.umask(self._old_mask) + + +class LockDescription(object): + def __init__(self): + self.owner = "" + self.exclusive = False + self.counter = 0 + self.time = 0 + self.reason = "" + + def IsLocked(self): + return self.counter or self.exclusive + + def __str__(self): + return " ".join(["Owner: %s" % self.owner, + "Exclusive: %s" % self.exclusive, + "Counter: %s" % self.counter, + "Time: %s" % self.time, + "Reason: %s" % self.reason]) + + +class FileLock(object): + LOCKS_DIR = "/home/mobiletc-prebuild/locks" + + def __init__(self, lock_filename): + assert os.path.isdir(self.LOCKS_DIR), ( + "Locks dir: %s doesn't exist!" % self.LOCKS_DIR) + self._filepath = os.path.join(self.LOCKS_DIR, lock_filename) + self._file = None + + @classmethod + def AsString(cls, file_locks): + stringify_fmt = "%-30s %-15s %-4s %-4s %-15s %-40s" + header = stringify_fmt % ("machine", "owner", "excl", "ctr", + "elapsed", "reason") + lock_strings = [] + for file_lock in file_locks: + + elapsed_time = datetime.timedelta( + seconds=int(time.time() - file_lock._description.time)) + elapsed_time = "%s ago" % elapsed_time + lock_strings.append(stringify_fmt % + (os.path.basename(file_lock._filepath), + file_lock._description.owner, + file_lock._description.exclusive, + file_lock._description.counter, + elapsed_time, + file_lock._description.reason)) + table = "\n".join(lock_strings) + return "\n".join([header, table]) + + @classmethod + def ListLock(cls, pattern): + full_pattern = os.path.join(cls.LOCKS_DIR, pattern) + file_locks = [] + for lock_filename in glob.glob(full_pattern): + file_lock = FileLock(lock_filename) + with file_lock as lock: + if lock.IsLocked(): + file_locks.append(file_lock) + logger.GetLogger().LogOutput("\n%s" % cls.AsString(file_locks)) + + def __enter__(self): + with FileCreationMask(0000): + try: + self._file = open(self._filepath, "a+") + self._file.seek(0, os.SEEK_SET) + + if fcntl.flock(self._file.fileno(), fcntl.LOCK_EX) == -1: + raise IOError("flock(%s, LOCK_EX) failed!" % self._filepath) + + try: + self._description = pickle.load(self._file) + except (EOFError, pickle.PickleError): + self._description = LockDescription() + return self._description + # Check this differently? + except IOError as ex: + logger.GetLogger().LogError(ex) + return None + + def __exit__(self, type, value, traceback): + self._file.truncate(0) + self._file.write(pickle.dumps(self._description)) + self._file.close() + + def __str__(self): + return self.AsString([self]) + + +class Lock(object): + def __init__(self, to_lock): + self._to_lock = to_lock + self._logger = logger.GetLogger() + + def NonBlockingLock(self, exclusive, reason=""): + with FileLock(self._to_lock) as lock: + if lock.exclusive: + self._logger.LogError( + "Exclusive lock already acquired by %s. Reason: %s" % + (lock.owner, lock.reason)) + return False + + if exclusive: + if lock.counter: + self._logger.LogError("Shared lock already acquired") + return False + lock.exclusive = True + lock.reason = reason + lock.owner = getpass.getuser() + lock.time = time.time() + else: + lock.counter += 1 + self._logger.LogOutput("Successfully locked: %s" % self._to_lock) + return True + + def Unlock(self, exclusive, force=False): + with FileLock(self._to_lock) as lock: + if not lock.IsLocked(): + self._logger.LogError("Can't unlock unlocked machine!") + return False + + if lock.exclusive != exclusive: + self._logger.LogError("shared locks must be unlocked with --shared") + return False + + if lock.exclusive: + if lock.owner != getpass.getuser() and not force: + self._logger.LogError("%s can't unlock lock owned by: %s" % + (getpass.getuser(), lock.owner)) + return False + lock.exclusive = False + lock.reason = "" + lock.owner = "" + else: + lock.counter -= 1 + return True + + +class Machine(object): + def __init__(self, name): + self._name = name + try: + self._full_name = socket.gethostbyaddr(name)[0] + except socket.error: + self._full_name = self._name + + def Lock(self, exclusive=False, reason=""): + lock = Lock(self._full_name) + return lock.NonBlockingLock(exclusive, reason) + + def Unlock(self, exclusive=False, ignore_ownership=False): + lock = Lock(self._full_name) + return lock.Unlock(exclusive, ignore_ownership) + + +def Main(argv): + """The main function.""" + parser = optparse.OptionParser() + parser.add_option("-r", + "--reason", + dest="reason", + default="", + help="The lock reason.") + parser.add_option("-u", + "--unlock", + dest="unlock", + action="store_true", + default=False, + help="Use this to unlock.") + parser.add_option("-l", + "--list_locks", + dest="list_locks", + action="store_true", + default=False, + help="Use this to list locks.") + parser.add_option("-f", + "--ignore_ownership", + dest="ignore_ownership", + action="store_true", + default=False, + help="Use this to force unlock on a lock you don't own.") + parser.add_option("-s", + "--shared", + dest="shared", + action="store_true", + default=False, + help="Use this for a shared (non-exclusive) lock.") + + options, args = parser.parse_args(argv) + + exclusive = not options.shared + + if not options.list_locks and len(args) != 2: + logger.GetLogger().LogError( + "Either --list_locks or a machine arg is needed.") + return 1 + + if len(args) > 1: + machine = Machine(args[1]) + else: + machine = None + + if options.list_locks: + FileLock.ListLock("*") + retval = True + elif options.unlock: + retval = machine.Unlock(exclusive, options.ignore_ownership) + else: + retval = machine.Lock(exclusive, options.reason) + + if retval: + return 0 + else: + return 1 + +if __name__ == "__main__": + sys.exit(Main(sys.argv)) -- cgit v1.2.3