[1456] | 1 | #!/usr/bin/env python |
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| 2 | from __future__ import with_statement |
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| 3 | |
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| 4 | import glob |
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| 5 | import logging.handlers |
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| 6 | import optparse |
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| 7 | import os |
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| 8 | import socket |
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| 9 | import shutil |
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| 10 | import subprocess |
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| 11 | import sys |
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| 12 | import time |
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| 13 | from os import path |
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| 14 | |
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| 15 | OCF_SUCCESS=0 |
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| 16 | OCF_ERR_GENERIC=1 |
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| 17 | OCF_ERR_ARGS=2 |
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| 18 | OCF_ERR_UNIMPLEMENTED=3 |
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| 19 | OCF_ERR_PERM=4 |
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| 20 | OCF_ERR_INSTALLED=5 |
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| 21 | OCF_ERR_CONFIGURED=6 |
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| 22 | OCF_NOT_RUNNING=7 |
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| 23 | |
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| 24 | logger = logging.getLogger('cron') |
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| 25 | |
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| 26 | import os |
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| 27 | import subprocess |
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| 28 | |
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| 29 | HA_LOGD = os.environ.get('HA_LOGD') == 'xyes' |
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| 30 | |
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| 31 | class HaLogHandler(logging.Handler): |
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| 32 | """ |
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| 33 | A handler class which writes to ha_logger. |
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| 34 | """ |
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| 35 | def __init__(self, ha_tag): |
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| 36 | """ |
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| 37 | Initialize the handler. ha_tag is the name of this resource. |
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| 38 | """ |
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| 39 | logging.Handler.__init__(self) |
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| 40 | self.ha_tag = ha_tag |
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| 41 | |
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| 42 | def emit(self, record): |
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| 43 | """ |
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| 44 | Emit a record. |
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| 45 | """ |
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| 46 | print 'Passed', record |
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| 47 | try: |
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| 48 | levelname = record.levelname |
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| 49 | msg = self.format(record) |
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| 50 | subprocess.call(['/usr/sbin/ha_logger', '-t', self.ha_tag, msg]) |
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| 51 | except (KeyboardInterrupt, SystemExit): |
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| 52 | raise |
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| 53 | except: |
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| 54 | self.handleError(record) |
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| 55 | |
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| 56 | class lock(object): |
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| 57 | def __init__(self, name): |
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| 58 | self.name = name |
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| 59 | |
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| 60 | def __enter__(self): |
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| 61 | while True: |
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| 62 | try: |
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| 63 | self.lock = os.open(self.name, os.O_RDWR | os.O_CREAT | os.O_EXCL) |
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| 64 | except OSError: |
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| 65 | logger.error('Could not acquire lock %s. Sleeping...' % self.name) |
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| 66 | time.sleep(0.5) |
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| 67 | else: |
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| 68 | break |
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| 69 | |
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| 70 | def __exit__(self, type, value, traceback): |
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| 71 | os.close(self.lock) |
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| 72 | _remove(self.name) |
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| 73 | |
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| 74 | def _touch(path): |
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| 75 | """Effectively touches a file. Returns true if successful, false |
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| 76 | otherwise""" |
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| 77 | try: |
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| 78 | open(path, 'a').close() |
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| 79 | except IOError: |
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| 80 | return False |
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| 81 | else: |
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| 82 | return True |
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| 83 | |
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| 84 | def _remove(dest): |
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| 85 | try: |
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| 86 | if path.isdir(dest): |
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| 87 | os.rmdir(dest) |
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| 88 | else: |
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| 89 | os.remove(dest) |
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| 90 | except OSError, e: |
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| 91 | logging.error('Could not remove %s: %s' % (dest, e)) |
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| 92 | return False |
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| 93 | else: |
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| 94 | return True |
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| 95 | |
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| 96 | def _mkdir(dir): |
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| 97 | try: |
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| 98 | os.mkdir(dir) |
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| 99 | except OSError, e: |
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| 100 | logging.error('Could not mkdir %s: %s' % (dir, e)) |
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| 101 | return False |
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| 102 | else: |
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| 103 | return True |
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| 104 | |
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| 105 | def _strip(name): |
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| 106 | """Strip off the file extension, and leading /'s, if they exist""" |
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| 107 | return path.splitext(path.basename(name))[0] |
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| 108 | |
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| 109 | def _suffix(name, suffix): |
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| 110 | return '%s.%s' % (name, suffix) |
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| 111 | |
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| 112 | def _crondir(server): |
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| 113 | return path.join(CRONSPOOL_DIR, _suffix(server, 'cronspool')) |
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| 114 | |
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| 115 | def _server_exists(server): |
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| 116 | return path.exists(path.join(SERVER_DIR, server)) |
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| 117 | |
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| 118 | def _serverfile(server): |
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| 119 | return path.join(SERVER_DIR, server) |
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| 120 | |
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| 121 | def _servers(): |
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| 122 | """Get a list of the servers.""" |
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| 123 | return [_strip(f) for f in glob.glob(path.join(SERVER_DIR, '*'))] |
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| 124 | |
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| 125 | def _is_master(server): |
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| 126 | crondir = path.join(CRONSPOOL_DIR, _suffix(server, 'cronspool')) |
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| 127 | return path.islink(crondir) |
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| 128 | |
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| 129 | def start_cron(args, options): |
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| 130 | if not _touch(_serverfile(HOSTNAME)): |
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| 131 | return OCF_ERR_CONFIGURED |
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| 132 | |
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| 133 | logger.info('Starting %s' % HOSTNAME) |
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| 134 | if _is_master(HOSTNAME): |
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| 135 | logger.error('%s is already the master!' % HOSTNAME) |
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| 136 | for server in _servers(): |
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| 137 | crondir = _crondir(server) |
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| 138 | if server == HOSTNAME: |
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| 139 | _remove(crondir) |
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| 140 | os.symlink('../cronspool', crondir) |
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| 141 | logger.info('Created master symlink %s' % crondir) |
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| 142 | else: |
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| 143 | if path.islink(crondir): |
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| 144 | _remove(crondir) |
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| 145 | logger.info('Removed old master symlink: %s' % crondir) |
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| 146 | if not path.exists(crondir): |
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| 147 | _mkdir(crondir) |
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| 148 | logger.info('Created slave dummy directory %s' % crondir) |
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| 149 | |
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| 150 | if CRON_RESTART_COMMAND: |
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| 151 | ret = subprocess.call(CRON_RESTART_COMMAND) |
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| 152 | if ret: |
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| 153 | logger.error('Cron restart exited with return code %d' % ret) |
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| 154 | return OCF_ERR_GENERIC |
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| 155 | else: |
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| 156 | logger.info('Restarted crond') |
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| 157 | return OCF_SUCCESS |
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| 158 | |
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| 159 | def stop_cron(args, options): |
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| 160 | if not _is_master(HOSTNAME): |
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| 161 | logger.error('I am not the master!') |
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| 162 | else: |
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| 163 | crondir = _crondir(HOSTNAME) |
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| 164 | logger.info('Removing symlink %s' % crondir) |
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| 165 | _remove(crondir) |
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| 166 | _mkdir(crondir) |
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| 167 | return OCF_SUCCESS |
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| 168 | |
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| 169 | def monitor_cron(args, options): |
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| 170 | if _is_master(HOSTNAME): |
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| 171 | return OCF_SUCCESS |
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| 172 | else: |
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| 173 | return OCF_NOT_RUNNING |
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| 174 | |
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| 175 | def validate_all_cron(args, options): |
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| 176 | if not _touch(_serverfile(HOSTNAME)): |
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| 177 | logger.error('Could not touch %s' % _serverfile(HOSTNAME)) |
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| 178 | return OCF_GENERIC_ERR |
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| 179 | if not path.exists(CRONSPOOL_DIR): |
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| 180 | return OCF_GENERIC_ERR |
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| 181 | |
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| 182 | def setup(args, options): |
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| 183 | for d in [CRONSPOOL_DIR, SERVER_DIR]: |
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| 184 | if not path.exists(d): |
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| 185 | os.makedirs(d) |
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| 186 | logger.info('Created %s' % d) |
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| 187 | else: |
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| 188 | logger.info('Already exists: %s' % d) |
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| 189 | |
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| 190 | def add_servers(servers, options): |
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| 191 | for server in servers: |
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| 192 | _touch(_serverfile(server)) |
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| 193 | |
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| 194 | def remove_servers(servers, options): |
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| 195 | for server in servers: |
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| 196 | os.unlink(_serverfile(server)) |
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| 197 | |
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| 198 | def meta_data_cron(args, options): |
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| 199 | print """<?xml version="1.0"?> |
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| 200 | <!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd"> |
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| 201 | <resource-agent name="hacron" version="0.1"> |
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| 202 | <version>1.0</version> |
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| 203 | |
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| 204 | <longdesc lang="en"> |
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| 205 | This is the high-availability cron manager. It uses an extremely overpowered |
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| 206 | clustering solution to make it so that people can have their crontabs. Yay. |
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| 207 | </longdesc> |
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| 208 | <shortdesc lang="en">HA Cron</shortdesc> |
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| 209 | |
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| 210 | <parameters> |
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| 211 | <parameter name="cron_root" required="1"> |
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| 212 | <longdesc lang="en"> |
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| 213 | Base directory for storage of crontabs and server information. |
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| 214 | </longdesc> |
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| 215 | <shortdesc lang="en">Cron base directory</shortdesc> |
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| 216 | <content type="string" /> |
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| 217 | </parameter> |
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| 218 | |
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| 219 | <parameter name="cron_restart_cmd"> |
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| 220 | <longdesc lang="en"> |
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| 221 | Command to restart cron. |
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| 222 | </longdesc> |
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| 223 | <shortdesc lang="en">Restart cron cmd</shortdesc> |
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| 224 | <content type="string" /> |
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| 225 | </parameter> |
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| 226 | </parameters> |
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| 227 | |
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| 228 | <actions> |
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| 229 | <action name="start" timeout="90" /> |
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| 230 | <action name="stop" timeout="100" /> |
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| 231 | <action name="monitor" timeout="20" interval="10" depth="0" start-delay="0" /> |
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| 232 | <action name="reload" timeout="90" /> |
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| 233 | <action name="meta-data" timeout="5" /> |
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| 234 | <action name="validate-all" timeout="30" /> |
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| 235 | </actions> |
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| 236 | </resource-agent> |
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| 237 | """ |
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| 238 | return OCF_SUCCESS |
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| 239 | |
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| 240 | def usage(parser): |
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| 241 | parser.print_help() |
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| 242 | return 1 |
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| 243 | |
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| 244 | def _set_globals(args, options): |
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| 245 | global HOSTNAME, CRONROOT, CRONSPOOL_DIR, SERVER_DIR, CRON_RESTART_COMMAND, \ |
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| 246 | HA_RSCTMP, OCF_RESOURCE_INSTANCE |
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| 247 | if options.development: |
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| 248 | logging.basicConfig(level=logging.DEBUG) |
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| 249 | else: |
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| 250 | if HA_LOGD: |
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| 251 | handler = HaLogHandler('hacron') |
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| 252 | else: |
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| 253 | handler = logging.handlers.SysLogHandler('/dev/log') |
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| 254 | formatter = logging.Formatter("%(module)s: %(levelname)s %(message)s") |
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| 255 | handler.setLevel(logging.INFO) |
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| 256 | handler.setFormatter(formatter) |
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| 257 | logger.addHandler(handler) |
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| 258 | HOSTNAME = options.server or os.environ.get('HA_CURHOST') or socket.gethostname() |
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| 259 | CRONROOT = options.cronroot or os.environ.get('OCF_RESKEY_cron_root') |
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| 260 | if not CRONROOT: |
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| 261 | logging.error('No cron_root specified.') |
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| 262 | return OCF_ERR_CONFIGURED |
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| 263 | CRONSPOOL_DIR = path.join(CRONROOT, 'server-cronspools') |
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| 264 | SERVER_DIR = path.join(CRONROOT, 'servers') |
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| 265 | CRON_RESTART_COMMAND = options.cron_restart or os.environ.get('OCF_RESKEY_cron_restart_cmd') |
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| 266 | |
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| 267 | HA_RSCTMP = os.environ.get('HA_RSCTMP', '/tmp') |
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| 268 | OCF_RESOURCE_INSTANCE = os.environ.get('OCF_RESOURCE_INSTANCE', 'default') |
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| 269 | return OCF_SUCCESS |
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| 270 | |
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| 271 | def main(): |
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| 272 | cmds = ['start', 'reload', 'stop', 'monitor', 'validate-all', 'setup', |
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| 273 | 'remove-servers', 'meta-data'] |
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| 274 | usage_str = "usage: %%prog [%s]" % '|'.join(cmds) |
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| 275 | parser = optparse.OptionParser(usage=usage_str) |
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| 276 | parser.add_option("-s", "--server", |
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| 277 | action="store", dest="server", |
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| 278 | default=None, |
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| 279 | help="choose which server to run script as") |
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| 280 | parser.add_option("-c", "--cronroot", |
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| 281 | action="store", dest="cronroot", |
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| 282 | default=None, |
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| 283 | help="pick root of cron dir") |
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| 284 | parser.add_option("-d", "--development", |
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| 285 | action="store_true", dest="development", |
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| 286 | default=False, |
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| 287 | help="run in production") |
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| 288 | parser.add_option("-r", "--cron-restart", |
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| 289 | action="store", dest="cron_restart", |
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| 290 | default=None, |
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| 291 | help="run in production") |
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| 292 | (options, args) = parser.parse_args() |
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| 293 | if len(args) < 1: |
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| 294 | return usage(parser) |
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| 295 | command = args[0] |
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| 296 | args = args[1:] |
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| 297 | |
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| 298 | if command == 'meta-data': |
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| 299 | return meta_data_cron(args, options) |
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| 300 | globals_status = _set_globals(args, options) |
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| 301 | with lock('%s/hacron-%s.lock' % (HA_RSCTMP, OCF_RESOURCE_INSTANCE)): |
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| 302 | if globals_status: |
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| 303 | return globals_status |
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| 304 | if command == 'start': |
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| 305 | return start_cron(args, options) |
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| 306 | elif command == 'reload': |
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| 307 | return start_cron(args, options) |
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| 308 | elif command == 'stop': |
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| 309 | return stop_cron(args, options) |
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| 310 | elif command == 'monitor': |
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| 311 | return monitor_cron(args, options) |
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| 312 | elif command == 'validate-all': |
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| 313 | return validate_all_cron(args, options) |
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| 314 | elif command == 'setup': |
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| 315 | return setup(args, options) |
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| 316 | elif command == 'add-servers': |
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| 317 | return remove_servers(args, options) |
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| 318 | else: |
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| 319 | usage(parser) |
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| 320 | return OCF_ERR_UNIMPLEMENTED |
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| 321 | |
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| 322 | if __name__ == '__main__': |
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| 323 | try: |
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| 324 | ret = main() |
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| 325 | except Exception, e: |
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| 326 | logger.error('exception from main: %s' % e) |
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| 327 | ret = OCF_ERR_GENERIC |
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| 328 | raise |
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| 329 | sys.exit(ret) |
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