示例#1
0
 def set_state(self, state):
     if state == self.state:
         return
     self.state = state
     logging.info('new state: %s' % state)
     if getattr(gconf, 'state_file', None):
         update_file(gconf.state_file, lambda f: f.write(state + '\n'))
示例#2
0
 def set_state(self, state, w=None):
     """set the state that can be used by external agents
        like glusterd for status reporting"""
     computestate = lambda: self.state and self._ST_ORD[max(
         self._ST_ORD.index(s) for s in self.state.values())]
     if w:
         self.lock.acquire()
         old_state = computestate()
         self.state[w] = state
         state = computestate()
         self.lock.release()
         if state != old_state:
             self.set_state(state)
     else:
         if getattr(gconf, 'state_file', None):
             # If previous state is paused, suffix the
             # new state with '(Paused)'
             try:
                 with open(gconf.state_file, "r") as f:
                     content = f.read()
                     if "paused" in content.lower():
                         state = state + '(Paused)'
             except IOError:
                 pass
             logging.info('new state: %s' % state)
             update_file(gconf.state_file, lambda f: f.write(state + '\n'))
示例#3
0
 def set_state(self, state, w=None):
     """set the state that can be used by external agents
        like glusterd for status reporting"""
     computestate = lambda: self.state and self._ST_ORD[
         max(self._ST_ORD.index(s) for s in self.state.values())]
     if w:
         self.lock.acquire()
         old_state = computestate()
         self.state[w] = state
         state = computestate()
         self.lock.release()
         if state != old_state:
             self.set_state(state)
     else:
         if getattr(gconf, 'state_file', None):
             # If previous state is paused, suffix the
             # new state with '(Paused)'
             try:
                 with open(gconf.state_file, "r") as f:
                     content = f.read()
                     if "paused" in content.lower():
                         state = state + '(Paused)'
             except IOError:
                 pass
             logging.info('new state: %s' % state)
             update_file(gconf.state_file, lambda f: f.write(state + '\n'))
示例#4
0
 def set_state(self, state):
     if state == self.state:
         return
     self.state = state
     logging.info('new state: %s' % state)
     if getattr(gconf, 'state_file', None):
         update_file(gconf.state_file, lambda f: f.write(state + '\n'))
示例#5
0
 def set_state(self, state):
     """set the state that can be used by external agents
        like glusterd for status reporting"""
     if state == self.state:
         return
     self.state = state
     logging.info('new state: %s' % state)
     if getattr(gconf, 'state_file', None):
         update_file(gconf.state_file, lambda f: f.write(state + '\n'))
示例#6
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 def write(self, trfn, opt, *a, **kw):
     def mergeconf(f):
         self.config = ConfigParser.RawConfigParser()
         self.config.readfp(f)
         self._normconfig()
         if not self.config.has_section(SECT_META):
             self.config.add_section(SECT_META)
         self.config.set(SECT_META, 'version', config_version)
         return trfn(norm(opt), *a, **kw)
     def updateconf(f):
         self.config.write(f)
     update_file(self.path, updateconf, mergeconf)
示例#7
0
 def write(self, trfn, opt, *a, **kw):
     def mergeconf(f):
         self.config = ConfigParser.RawConfigParser()
         self.config.readfp(f)
         self._normconfig()
         if not self.config.has_section(SECT_META):
             self.config.add_section(SECT_META)
         self.config.set(SECT_META, 'version', config_version)
         return trfn(norm(opt), *a, **kw)
     def updateconf(f):
         self.config.write(f)
     update_file(self.path, updateconf, mergeconf)
示例#8
0
 def set_state(self, state, w=None):
     """set the state that can be used by external agents
        like glusterd for status reporting"""
     computestate = lambda: self.state and self._ST_ORD[max(self._ST_ORD.index(s) for s in self.state.values())]
     if w:
         self.lock.acquire()
         old_state = computestate()
         self.state[w] = state
         state = computestate()
         self.lock.release()
         if state != old_state:
             self.set_state(state)
     else:
         logging.info("new state: %s" % state)
         if getattr(gconf, "state_file", None):
             update_file(gconf.state_file, lambda f: f.write(state + "\n"))
示例#9
0
 def set_state(self, state, w=None):
     """set the state that can be used by external agents
        like glusterd for status reporting"""
     computestate = lambda: self.state and self._ST_ORD[
         max(self._ST_ORD.index(s) for s in self.state.values())]
     if w:
         self.lock.acquire()
         old_state = computestate()
         self.state[w] = state
         state = computestate()
         self.lock.release()
         if state != old_state:
             self.set_state(state)
     else:
         logging.info('new state: %s' % state)
         if getattr(gconf, 'state_file', None):
             update_file(gconf.state_file, lambda f: f.write(state + '\n'))
    def write(self, trfn, opt, *a, **kw):
        """update on-disk config transactionally

        @trfn is the transaction function
        """

        def mergeconf(f):
            self.config = ConfigParser.RawConfigParser()
            self.config.readfp(f)
            self._normconfig()
            if not self.config.has_section(SECT_META):
                self.config.add_section(SECT_META)
            self.config.set(SECT_META, "version", config_version)
            return trfn(norm(opt), *a, **kw)

        def updateconf(f):
            self.config.write(f)

        update_file(self.path, updateconf, mergeconf)
示例#11
0
def main_i():
    """internal main routine

    parse command line, decide what action will be taken;
    we can either:
    - query/manipulate configuration
    - format gsyncd urls using gsyncd's url parsing engine
    - start service in following modes, in given stages:
      - agent: startup(), ChangelogAgent()
      - monitor: startup(), monitor()
      - master: startup(), connect_remote(), connect(), service_loop()
      - slave: startup(), connect(), service_loop()
    """
    rconf = {'go_daemon': 'should'}

    def store_abs(opt, optstr, val, parser):
        if val and val != '-':
            val = os.path.abspath(val)
        setattr(parser.values, opt.dest, val)

    def store_local(opt, optstr, val, parser):
        rconf[opt.dest] = val

    def store_local_curry(val):
        return lambda o, oo, vx, p: store_local(o, oo, val, p)

    def store_local_obj(op, dmake):
        return lambda o, oo, vx, p: store_local(
            o, oo, FreeObject(op=op, **dmake(vx)), p)

    op = OptionParser(
        usage="%prog [options...] <master> <slave>", version="%prog 0.0.1")
    op.add_option('--gluster-command-dir', metavar='DIR', default='')
    op.add_option('--gluster-log-file', metavar='LOGF',
                  default=os.devnull, type=str, action='callback',
                  callback=store_abs)
    op.add_option('--gluster-log-level', metavar='LVL')
    op.add_option('--gluster-params', metavar='PRMS', default='')
    op.add_option(
        '--glusterd-uuid', metavar='UUID', type=str, default='',
        help=SUPPRESS_HELP)
    op.add_option(
        '--gluster-cli-options', metavar='OPTS', default='--log-file=-')
    op.add_option('--mountbroker', metavar='LABEL')
    op.add_option('-p', '--pid-file', metavar='PIDF', type=str,
                  action='callback', callback=store_abs)
    op.add_option('-l', '--log-file', metavar='LOGF', type=str,
                  action='callback', callback=store_abs)
    op.add_option('--iprefix',  metavar='LOGD',  type=str,
                  action='callback', callback=store_abs)
    op.add_option('--changelog-log-file',  metavar='LOGF',  type=str,
                  action='callback', callback=store_abs)
    op.add_option('--log-file-mbr', metavar='LOGF', type=str,
                  action='callback', callback=store_abs)
    op.add_option('--state-file', metavar='STATF', type=str,
                  action='callback', callback=store_abs)
    op.add_option('--state-detail-file', metavar='STATF',
                  type=str, action='callback', callback=store_abs)
    op.add_option('--georep-session-working-dir', metavar='STATF',
                  type=str, action='callback', callback=store_abs)
    op.add_option('--ignore-deletes', default=False, action='store_true')
    op.add_option('--isolated-slave', default=False, action='store_true')
    op.add_option('--use-rsync-xattrs', default=False, action='store_true')
    op.add_option('--pause-on-start', default=False, action='store_true')
    op.add_option('-L', '--log-level', metavar='LVL')
    op.add_option('-r', '--remote-gsyncd', metavar='CMD',
                  default=os.path.abspath(sys.argv[0]))
    op.add_option('--volume-id', metavar='UUID')
    op.add_option('--slave-id', metavar='ID')
    op.add_option('--session-owner', metavar='ID')
    op.add_option('--local-id', metavar='ID', help=SUPPRESS_HELP, default='')
    op.add_option(
        '--local-path', metavar='PATH', help=SUPPRESS_HELP, default='')
    op.add_option('-s', '--ssh-command', metavar='CMD', default='ssh')
    op.add_option('--ssh-command-tar', metavar='CMD', default='ssh')
    op.add_option('--rsync-command', metavar='CMD', default='rsync')
    op.add_option('--rsync-options', metavar='OPTS', default='')
    op.add_option('--rsync-ssh-options', metavar='OPTS', default='--compress')
    op.add_option('--timeout', metavar='SEC', type=int, default=120)
    op.add_option('--connection-timeout', metavar='SEC',
                  type=int, default=60, help=SUPPRESS_HELP)
    op.add_option('--sync-jobs', metavar='N', type=int, default=3)
    op.add_option('--replica-failover-interval', metavar='N',
                  type=int, default=1)
    op.add_option('--changelog-archive-format', metavar='N',
                  type=str, default="%Y%m")
    op.add_option(
        '--turns', metavar='N', type=int, default=0, help=SUPPRESS_HELP)
    op.add_option('--allow-network', metavar='IPS', default='')
    op.add_option('--socketdir', metavar='DIR')
    op.add_option('--state-socket-unencoded', metavar='SOCKF',
                  type=str, action='callback', callback=store_abs)
    op.add_option('--checkpoint', metavar='LABEL', default='')

    # tunables for failover/failback mechanism:
    # None   - gsyncd behaves as normal
    # blind  - gsyncd works with xtime pairs to identify
    #          candidates for synchronization
    # wrapup - same as normal mode but does not assign
    #          xtimes to orphaned files
    # see crawl() for usage of the above tunables
    op.add_option('--special-sync-mode', type=str, help=SUPPRESS_HELP)

    # changelog or xtime? (TODO: Change the default)
    op.add_option(
        '--change-detector', metavar='MODE', type=str, default='xtime')
    # sleep interval for change detection (xtime crawl uses a hardcoded 1
    # second sleep time)
    op.add_option('--change-interval', metavar='SEC', type=int, default=3)
    # working directory for changelog based mechanism
    op.add_option('--working-dir', metavar='DIR', type=str,
                  action='callback', callback=store_abs)
    op.add_option('--use-tarssh', default=False, action='store_true')

    op.add_option('-c', '--config-file', metavar='CONF',
                  type=str, action='callback', callback=store_local)
    # duh. need to specify dest or value will be mapped to None :S
    op.add_option('--monitor', dest='monitor', action='callback',
                  callback=store_local_curry(True))
    op.add_option('--agent', dest='agent', action='callback',
                  callback=store_local_curry(True))
    op.add_option('--resource-local', dest='resource_local',
                  type=str, action='callback', callback=store_local)
    op.add_option('--resource-remote', dest='resource_remote',
                  type=str, action='callback', callback=store_local)
    op.add_option('--feedback-fd', dest='feedback_fd', type=int,
                  help=SUPPRESS_HELP, action='callback', callback=store_local)
    op.add_option('--rpc-fd', dest='rpc_fd', type=str, help=SUPPRESS_HELP)
    op.add_option('--listen', dest='listen', help=SUPPRESS_HELP,
                  action='callback', callback=store_local_curry(True))
    op.add_option('-N', '--no-daemon', dest="go_daemon",
                  action='callback', callback=store_local_curry('dont'))
    op.add_option('--verify', type=str, dest="verify",
                  action='callback', callback=store_local)
    op.add_option('--create', type=str, dest="create",
                  action='callback', callback=store_local)
    op.add_option('--delete', dest='delete', action='callback',
                  callback=store_local_curry(True))
    op.add_option('--debug', dest="go_daemon", action='callback',
                  callback=lambda *a: (store_local_curry('dont')(*a),
                                       setattr(
                                           a[-1].values, 'log_file', '-'),
                                       setattr(a[-1].values, 'log_level',
                                               'DEBUG'),
                                       setattr(a[-1].values,
                                               'changelog_log_file', '-')))
    op.add_option('--path', type=str, action='append')

    for a in ('check', 'get'):
        op.add_option('--config-' + a, metavar='OPT', type=str, dest='config',
                      action='callback',
                      callback=store_local_obj(a, lambda vx: {'opt': vx}))
    op.add_option('--config-get-all', dest='config', action='callback',
                  callback=store_local_obj('get', lambda vx: {'opt': None}))
    for m in ('', '-rx', '-glob'):
        # call this code 'Pythonic' eh?
        # have to define a one-shot local function to be able
        # to inject (a value depending on the)
        # iteration variable into the inner lambda
        def conf_mod_opt_regex_variant(rx):
            op.add_option('--config-set' + m, metavar='OPT VAL', type=str,
                          nargs=2, dest='config', action='callback',
                          callback=store_local_obj('set', lambda vx: {
                              'opt': vx[0], 'val': vx[1], 'rx': rx}))
            op.add_option('--config-del' + m, metavar='OPT', type=str,
                          dest='config', action='callback',
                          callback=store_local_obj('del', lambda vx: {
                              'opt': vx, 'rx': rx}))
        conf_mod_opt_regex_variant(m and m[1:] or False)

    op.add_option('--normalize-url', dest='url_print',
                  action='callback', callback=store_local_curry('normal'))
    op.add_option('--canonicalize-url', dest='url_print',
                  action='callback', callback=store_local_curry('canon'))
    op.add_option('--canonicalize-escape-url', dest='url_print',
                  action='callback', callback=store_local_curry('canon_esc'))

    tunables = [norm(o.get_opt_string()[2:])
                for o in op.option_list
                if (o.callback in (store_abs, 'store_true', None) and
                    o.get_opt_string() not in ('--version', '--help'))]
    remote_tunables = ['listen', 'go_daemon', 'timeout',
                       'session_owner', 'config_file', 'use_rsync_xattrs']
    rq_remote_tunables = {'listen': True}

    # precedence for sources of values: 1) commandline, 2) cfg file, 3)
    # defaults for this to work out we need to tell apart defaults from
    # explicitly set options... so churn out the defaults here and call
    # the parser with virgin values container.
    defaults = op.get_default_values()
    opts, args = op.parse_args(values=optparse.Values())
    args_orig = args[:]
    r = rconf.get('resource_local')
    if r:
        if len(args) == 0:
            args.append(None)
        args[0] = r
    r = rconf.get('resource_remote')
    if r:
        if len(args) == 0:
            raise GsyncdError('local resource unspecfied')
        elif len(args) == 1:
            args.append(None)
        args[1] = r
    confdata = rconf.get('config')
    if not (len(args) == 2 or
            (len(args) == 1 and rconf.get('listen')) or
            (len(args) <= 2 and confdata) or
            rconf.get('url_print')):
        sys.stderr.write("error: incorrect number of arguments\n\n")
        sys.stderr.write(op.get_usage() + "\n")
        sys.exit(1)

    verify = rconf.get('verify')
    if verify:
        logging.info(verify)
        logging.info("Able to spawn gsyncd.py")
        return

    restricted = os.getenv('_GSYNCD_RESTRICTED_')

    if restricted:
        allopts = {}
        allopts.update(opts.__dict__)
        allopts.update(rconf)
        bannedtuns = set(allopts.keys()) - set(remote_tunables)
        if bannedtuns:
            raise GsyncdError('following tunables cannot be set with '
                              'restricted SSH invocaton: ' +
                              ', '.join(bannedtuns))
        for k, v in rq_remote_tunables.items():
            if not k in allopts or allopts[k] != v:
                raise GsyncdError('tunable %s is not set to value %s required '
                                  'for restricted SSH invocaton' %
                                  (k, v))

    confrx = getattr(confdata, 'rx', None)

    def makersc(aa, check=True):
        if not aa:
            return ([], None, None)
        ra = [resource.parse_url(u) for u in aa]
        local = ra[0]
        remote = None
        if len(ra) > 1:
            remote = ra[1]
        if check and not local.can_connect_to(remote):
            raise GsyncdError("%s cannot work with %s" %
                              (local.path, remote and remote.path))
        return (ra, local, remote)
    if confrx:
        # peers are regexen, don't try to parse them
        if confrx == 'glob':
            args = ['\A' + fnmatch.translate(a) for a in args]
        canon_peers = args
        namedict = {}
    else:
        dc = rconf.get('url_print')
        rscs, local, remote = makersc(args_orig, not dc)
        if dc:
            for r in rscs:
                print(r.get_url(**{'normal': {},
                                   'canon': {'canonical': True},
                                   'canon_esc': {'canonical': True,
                                                 'escaped': True}}[dc]))
            return
        pa = ([], [], [])
        urlprms = (
            {}, {'canonical': True}, {'canonical': True, 'escaped': True})
        for x in rscs:
            for i in range(len(pa)):
                pa[i].append(x.get_url(**urlprms[i]))
        _, canon_peers, canon_esc_peers = pa
        # creating the namedict, a dict representing various ways of referring
        # to / repreenting peers to be fillable in config templates
        mods = (lambda x: x, lambda x: x[
                0].upper() + x[1:], lambda x: 'e' + x[0].upper() + x[1:])
        if remote:
            rmap = {local: ('local', 'master'), remote: ('remote', 'slave')}
        else:
            rmap = {local: ('local', 'slave')}
        namedict = {}
        for i in range(len(rscs)):
            x = rscs[i]
            for name in rmap[x]:
                for j in range(3):
                    namedict[mods[j](name)] = pa[j][i]
                namedict[name + 'vol'] = x.volume
                if name == 'remote':
                    namedict['remotehost'] = x.remotehost
    if not 'config_file' in rconf:
        rconf['config_file'] = os.path.join(
            os.path.dirname(sys.argv[0]), "conf/gsyncd_template.conf")

    upgrade_config_file(rconf['config_file'])
    gcnf = GConffile(
        rconf['config_file'], canon_peers,
        defaults.__dict__, opts.__dict__, namedict)

    checkpoint_change = False
    if confdata:
        opt_ok = norm(confdata.opt) in tunables + [None]
        if confdata.op == 'check':
            if opt_ok:
                sys.exit(0)
            else:
                sys.exit(1)
        elif not opt_ok:
            raise GsyncdError("not a valid option: " + confdata.opt)
        if confdata.op == 'get':
            gcnf.get(confdata.opt)
        elif confdata.op == 'set':
            gcnf.set(confdata.opt, confdata.val, confdata.rx)
        elif confdata.op == 'del':
            gcnf.delete(confdata.opt, confdata.rx)
        # when modifying checkpoint, it's important to make a log
        # of that, so in that case we go on to set up logging even
        # if its just config invocation
        if confdata.opt == 'checkpoint' and confdata.op in ('set', 'del') and \
           not confdata.rx:
            checkpoint_change = True
        if not checkpoint_change:
            return

    gconf.__dict__.update(defaults.__dict__)
    gcnf.update_to(gconf.__dict__)
    gconf.__dict__.update(opts.__dict__)
    gconf.configinterface = gcnf

    delete = rconf.get('delete')
    if delete:
        logging.info('geo-replication delete')
        # Delete pid file, status file, socket file
        cleanup_paths = []
        if getattr(gconf, 'pid_file', None):
            cleanup_paths.append(gconf.pid_file)

        if getattr(gconf, 'state_file', None):
            cleanup_paths.append(gconf.state_file)

        if getattr(gconf, 'state_detail_file', None):
            cleanup_paths.append(gconf.state_detail_file)

        if getattr(gconf, 'state_socket_unencoded', None):
            cleanup_paths.append(gconf.state_socket_unencoded)

        cleanup_paths.append(rconf['config_file'][:-11] + "*")

        # Cleanup changelog working dirs
        if getattr(gconf, 'working_dir', None):
            try:
                shutil.rmtree(gconf.working_dir)
            except (IOError, OSError):
                if sys.exc_info()[1].errno == ENOENT:
                    pass
                else:
                    raise GsyncdError(
                        'Error while removing working dir: %s' %
                        gconf.working_dir)

        for path in cleanup_paths:
            # To delete temp files
            for f in glob.glob(path + "*"):
                _unlink(f)
        return

    if restricted and gconf.allow_network:
        ssh_conn = os.getenv('SSH_CONNECTION')
        if not ssh_conn:
            # legacy env var
            ssh_conn = os.getenv('SSH_CLIENT')
        if ssh_conn:
            allowed_networks = [IPNetwork(a)
                                for a in gconf.allow_network.split(',')]
            client_ip = IPAddress(ssh_conn.split()[0])
            allowed = False
            for nw in allowed_networks:
                if client_ip in nw:
                    allowed = True
                    break
            if not allowed:
                raise GsyncdError("client IP address is not allowed")

    ffd = rconf.get('feedback_fd')
    if ffd:
        fcntl.fcntl(ffd, fcntl.F_SETFD, fcntl.FD_CLOEXEC)

    # normalize loglevel
    lvl0 = gconf.log_level
    if isinstance(lvl0, str):
        lvl1 = lvl0.upper()
        lvl2 = logging.getLevelName(lvl1)
        # I have _never_ _ever_ seen such an utterly braindead
        # error condition
        if lvl2 == "Level " + lvl1:
            raise GsyncdError('cannot recognize log level "%s"' % lvl0)
        gconf.log_level = lvl2

    if not privileged() and gconf.log_file_mbr:
        gconf.log_file = gconf.log_file_mbr

    if checkpoint_change:
        try:
            GLogger._gsyncd_loginit(log_file=gconf.log_file, label='conf')
            if confdata.op == 'set':
                logging.info('checkpoint %s set' % confdata.val)
                gcnf.delete('checkpoint_completed')
                gcnf.delete('checkpoint_target')
            elif confdata.op == 'del':
                logging.info('checkpoint info was reset')
                # if it is removing 'checkpoint' then we need
                # to remove 'checkpoint_completed' and 'checkpoint_target' too
                gcnf.delete('checkpoint_completed')
                gcnf.delete('checkpoint_target')

        except IOError:
            if sys.exc_info()[1].errno == ENOENT:
                # directory of log path is not present,
                # which happens if we get here from
                # a peer-multiplexed "config-set checkpoint"
                # (as that directory is created only on the
                # original node)
                pass
            else:
                raise
        return

    create = rconf.get('create')
    if create:
        if getattr(gconf, 'state_file', None):
            update_file(gconf.state_file, lambda f: f.write(create + '\n'))
        return

    go_daemon = rconf['go_daemon']
    be_monitor = rconf.get('monitor')
    be_agent = rconf.get('agent')

    rscs, local, remote = makersc(args)
    if not be_monitor and isinstance(remote, resource.SSH) and \
       go_daemon == 'should':
        go_daemon = 'postconn'
        log_file = None
    else:
        log_file = gconf.log_file
    if be_monitor:
        label = 'monitor'
    elif be_agent:
        label = 'agent'
    elif remote:
        # master
        label = gconf.local_path
    else:
        label = 'slave'
    startup(go_daemon=go_daemon, log_file=log_file, label=label)
    resource.Popen.init_errhandler()

    if be_agent:
        os.setsid()
        logging.debug('rpc_fd: %s' % repr(gconf.rpc_fd))
        return agent(Changelog(), gconf.rpc_fd)

    if be_monitor:
        return monitor(*rscs)

    logging.info("syncing: %s" % " -> ".join(r.url for r in rscs))
    if remote:
        go_daemon = remote.connect_remote(go_daemon=go_daemon)
        if go_daemon:
            startup(go_daemon=go_daemon, log_file=gconf.log_file)
            # complete remote connection in child
            remote.connect_remote(go_daemon='done')
    local.connect()
    if ffd:
        os.close(ffd)
    local.service_loop(*[r for r in [remote] if r])
示例#12
0
def main_i():
    """internal main routine

    parse command line, decide what action will be taken;
    we can either:
    - query/manipulate configuration
    - format gsyncd urls using gsyncd's url parsing engine
    - start service in following modes, in given stages:
      - agent: startup(), ChangelogAgent()
      - monitor: startup(), monitor()
      - master: startup(), connect_remote(), connect(), service_loop()
      - slave: startup(), connect(), service_loop()
    """
    rconf = {'go_daemon': 'should'}

    def store_abs(opt, optstr, val, parser):
        if val and val != '-':
            val = os.path.abspath(val)
        setattr(parser.values, opt.dest, val)

    def store_local(opt, optstr, val, parser):
        rconf[opt.dest] = val

    def store_local_curry(val):
        return lambda o, oo, vx, p: store_local(o, oo, val, p)

    def store_local_obj(op, dmake):
        return lambda o, oo, vx, p: store_local(
            o, oo, FreeObject(op=op, **dmake(vx)), p)

    op = OptionParser(
        usage="%prog [options...] <master> <slave>", version="%prog 0.0.1")
    op.add_option('--gluster-command-dir', metavar='DIR', default='')
    op.add_option('--gluster-log-file', metavar='LOGF',
                  default=os.devnull, type=str, action='callback',
                  callback=store_abs)
    op.add_option('--gluster-log-level', metavar='LVL')
    op.add_option('--gluster-params', metavar='PRMS', default='')
    op.add_option(
        '--glusterd-uuid', metavar='UUID', type=str, default='',
        help=SUPPRESS_HELP)
    op.add_option(
        '--gluster-cli-options', metavar='OPTS', default='--log-file=-')
    op.add_option('--mountbroker', metavar='LABEL')
    op.add_option('-p', '--pid-file', metavar='PIDF', type=str,
                  action='callback', callback=store_abs)
    op.add_option('-l', '--log-file', metavar='LOGF', type=str,
                  action='callback', callback=store_abs)
    op.add_option('--iprefix',  metavar='LOGD',  type=str,
                  action='callback', callback=store_abs)
    op.add_option('--changelog-log-file',  metavar='LOGF',  type=str,
                  action='callback', callback=store_abs)
    op.add_option('--log-file-mbr', metavar='LOGF', type=str,
                  action='callback', callback=store_abs)
    op.add_option('--state-file', metavar='STATF', type=str,
                  action='callback', callback=store_abs)
    op.add_option('--state-detail-file', metavar='STATF',
                  type=str, action='callback', callback=store_abs)
    op.add_option('--georep-session-working-dir', metavar='STATF',
                  type=str, action='callback', callback=store_abs)
    op.add_option('--ignore-deletes', default=False, action='store_true')
    op.add_option('--isolated-slave', default=False, action='store_true')
    op.add_option('--use-rsync-xattrs', default=False, action='store_true')
    op.add_option('--pause-on-start', default=False, action='store_true')
    op.add_option('-L', '--log-level', metavar='LVL')
    op.add_option('-r', '--remote-gsyncd', metavar='CMD',
                  default=os.path.abspath(sys.argv[0]))
    op.add_option('--volume-id', metavar='UUID')
    op.add_option('--slave-id', metavar='ID')
    op.add_option('--session-owner', metavar='ID')
    op.add_option('--local-id', metavar='ID', help=SUPPRESS_HELP, default='')
    op.add_option(
        '--local-path', metavar='PATH', help=SUPPRESS_HELP, default='')
    op.add_option('-s', '--ssh-command', metavar='CMD', default='ssh')
    op.add_option('--ssh-command-tar', metavar='CMD', default='ssh')
    op.add_option('--rsync-command', metavar='CMD', default='rsync')
    op.add_option('--rsync-options', metavar='OPTS', default='')
    op.add_option('--rsync-ssh-options', metavar='OPTS', default='--compress')
    op.add_option('--timeout', metavar='SEC', type=int, default=120)
    op.add_option('--connection-timeout', metavar='SEC',
                  type=int, default=60, help=SUPPRESS_HELP)
    op.add_option('--sync-jobs', metavar='N', type=int, default=3)
    op.add_option('--replica-failover-interval', metavar='N',
                  type=int, default=1)
    op.add_option(
        '--turns', metavar='N', type=int, default=0, help=SUPPRESS_HELP)
    op.add_option('--allow-network', metavar='IPS', default='')
    op.add_option('--socketdir', metavar='DIR')
    op.add_option('--state-socket-unencoded', metavar='SOCKF',
                  type=str, action='callback', callback=store_abs)
    op.add_option('--checkpoint', metavar='LABEL', default='')

    # tunables for failover/failback mechanism:
    # None   - gsyncd behaves as normal
    # blind  - gsyncd works with xtime pairs to identify
    #          candidates for synchronization
    # wrapup - same as normal mode but does not assign
    #          xtimes to orphaned files
    # see crawl() for usage of the above tunables
    op.add_option('--special-sync-mode', type=str, help=SUPPRESS_HELP)

    # changelog or xtime? (TODO: Change the default)
    op.add_option(
        '--change-detector', metavar='MODE', type=str, default='xtime')
    # sleep interval for change detection (xtime crawl uses a hardcoded 1
    # second sleep time)
    op.add_option('--change-interval', metavar='SEC', type=int, default=3)
    # working directory for changelog based mechanism
    op.add_option('--working-dir', metavar='DIR', type=str,
                  action='callback', callback=store_abs)
    op.add_option('--use-tarssh', default=False, action='store_true')

    op.add_option('-c', '--config-file', metavar='CONF',
                  type=str, action='callback', callback=store_local)
    # duh. need to specify dest or value will be mapped to None :S
    op.add_option('--monitor', dest='monitor', action='callback',
                  callback=store_local_curry(True))
    op.add_option('--agent', dest='agent', action='callback',
                  callback=store_local_curry(True))
    op.add_option('--resource-local', dest='resource_local',
                  type=str, action='callback', callback=store_local)
    op.add_option('--resource-remote', dest='resource_remote',
                  type=str, action='callback', callback=store_local)
    op.add_option('--feedback-fd', dest='feedback_fd', type=int,
                  help=SUPPRESS_HELP, action='callback', callback=store_local)
    op.add_option('--rpc-fd', dest='rpc_fd', type=str, help=SUPPRESS_HELP)
    op.add_option('--listen', dest='listen', help=SUPPRESS_HELP,
                  action='callback', callback=store_local_curry(True))
    op.add_option('-N', '--no-daemon', dest="go_daemon",
                  action='callback', callback=store_local_curry('dont'))
    op.add_option('--verify', type=str, dest="verify",
                  action='callback', callback=store_local)
    op.add_option('--create', type=str, dest="create",
                  action='callback', callback=store_local)
    op.add_option('--delete', dest='delete', action='callback',
                  callback=store_local_curry(True))
    op.add_option('--debug', dest="go_daemon", action='callback',
                  callback=lambda *a: (store_local_curry('dont')(*a),
                                       setattr(
                                           a[-1].values, 'log_file', '-'),
                                       setattr(a[-1].values, 'log_level',
                                               'DEBUG'),
                                       setattr(a[-1].values,
                                               'changelog_log_file', '-')))
    op.add_option('--path', type=str, action='append')

    for a in ('check', 'get'):
        op.add_option('--config-' + a, metavar='OPT', type=str, dest='config',
                      action='callback',
                      callback=store_local_obj(a, lambda vx: {'opt': vx}))
    op.add_option('--config-get-all', dest='config', action='callback',
                  callback=store_local_obj('get', lambda vx: {'opt': None}))
    for m in ('', '-rx', '-glob'):
        # call this code 'Pythonic' eh?
        # have to define a one-shot local function to be able
        # to inject (a value depending on the)
        # iteration variable into the inner lambda
        def conf_mod_opt_regex_variant(rx):
            op.add_option('--config-set' + m, metavar='OPT VAL', type=str,
                          nargs=2, dest='config', action='callback',
                          callback=store_local_obj('set', lambda vx: {
                              'opt': vx[0], 'val': vx[1], 'rx': rx}))
            op.add_option('--config-del' + m, metavar='OPT', type=str,
                          dest='config', action='callback',
                          callback=store_local_obj('del', lambda vx: {
                              'opt': vx, 'rx': rx}))
        conf_mod_opt_regex_variant(m and m[1:] or False)

    op.add_option('--normalize-url', dest='url_print',
                  action='callback', callback=store_local_curry('normal'))
    op.add_option('--canonicalize-url', dest='url_print',
                  action='callback', callback=store_local_curry('canon'))
    op.add_option('--canonicalize-escape-url', dest='url_print',
                  action='callback', callback=store_local_curry('canon_esc'))

    tunables = [norm(o.get_opt_string()[2:])
                for o in op.option_list
                if (o.callback in (store_abs, 'store_true', None) and
                    o.get_opt_string() not in ('--version', '--help'))]
    remote_tunables = ['listen', 'go_daemon', 'timeout',
                       'session_owner', 'config_file', 'use_rsync_xattrs']
    rq_remote_tunables = {'listen': True}

    # precedence for sources of values: 1) commandline, 2) cfg file, 3)
    # defaults for this to work out we need to tell apart defaults from
    # explicitly set options... so churn out the defaults here and call
    # the parser with virgin values container.
    defaults = op.get_default_values()
    opts, args = op.parse_args(values=optparse.Values())
    args_orig = args[:]
    r = rconf.get('resource_local')
    if r:
        if len(args) == 0:
            args.append(None)
        args[0] = r
    r = rconf.get('resource_remote')
    if r:
        if len(args) == 0:
            raise GsyncdError('local resource unspecfied')
        elif len(args) == 1:
            args.append(None)
        args[1] = r
    confdata = rconf.get('config')
    if not (len(args) == 2 or
            (len(args) == 1 and rconf.get('listen')) or
            (len(args) <= 2 and confdata) or
            rconf.get('url_print')):
        sys.stderr.write("error: incorrect number of arguments\n\n")
        sys.stderr.write(op.get_usage() + "\n")
        sys.exit(1)

    verify = rconf.get('verify')
    if verify:
        logging.info(verify)
        logging.info("Able to spawn gsyncd.py")
        return

    restricted = os.getenv('_GSYNCD_RESTRICTED_')

    if restricted:
        allopts = {}
        allopts.update(opts.__dict__)
        allopts.update(rconf)
        bannedtuns = set(allopts.keys()) - set(remote_tunables)
        if bannedtuns:
            raise GsyncdError('following tunables cannot be set with '
                              'restricted SSH invocaton: ' +
                              ', '.join(bannedtuns))
        for k, v in rq_remote_tunables.items():
            if not k in allopts or allopts[k] != v:
                raise GsyncdError('tunable %s is not set to value %s required '
                                  'for restricted SSH invocaton' %
                                  (k, v))

    confrx = getattr(confdata, 'rx', None)

    def makersc(aa, check=True):
        if not aa:
            return ([], None, None)
        ra = [resource.parse_url(u) for u in aa]
        local = ra[0]
        remote = None
        if len(ra) > 1:
            remote = ra[1]
        if check and not local.can_connect_to(remote):
            raise GsyncdError("%s cannot work with %s" %
                              (local.path, remote and remote.path))
        return (ra, local, remote)
    if confrx:
        # peers are regexen, don't try to parse them
        if confrx == 'glob':
            args = ['\A' + fnmatch.translate(a) for a in args]
        canon_peers = args
        namedict = {}
    else:
        dc = rconf.get('url_print')
        rscs, local, remote = makersc(args_orig, not dc)
        if dc:
            for r in rscs:
                print(r.get_url(**{'normal': {},
                                   'canon': {'canonical': True},
                                   'canon_esc': {'canonical': True,
                                                 'escaped': True}}[dc]))
            return
        pa = ([], [], [])
        urlprms = (
            {}, {'canonical': True}, {'canonical': True, 'escaped': True})
        for x in rscs:
            for i in range(len(pa)):
                pa[i].append(x.get_url(**urlprms[i]))
        _, canon_peers, canon_esc_peers = pa
        # creating the namedict, a dict representing various ways of referring
        # to / repreenting peers to be fillable in config templates
        mods = (lambda x: x, lambda x: x[
                0].upper() + x[1:], lambda x: 'e' + x[0].upper() + x[1:])
        if remote:
            rmap = {local: ('local', 'master'), remote: ('remote', 'slave')}
        else:
            rmap = {local: ('local', 'slave')}
        namedict = {}
        for i in range(len(rscs)):
            x = rscs[i]
            for name in rmap[x]:
                for j in range(3):
                    namedict[mods[j](name)] = pa[j][i]
                namedict[name + 'vol'] = x.volume
                if name == 'remote':
                    namedict['remotehost'] = x.remotehost
    if not 'config_file' in rconf:
        rconf['config_file'] = os.path.join(
            os.path.dirname(sys.argv[0]), "conf/gsyncd_template.conf")

    upgrade_config_file(rconf['config_file'])
    gcnf = GConffile(
        rconf['config_file'], canon_peers,
        defaults.__dict__, opts.__dict__, namedict)

    checkpoint_change = False
    if confdata:
        opt_ok = norm(confdata.opt) in tunables + [None]
        if confdata.op == 'check':
            if opt_ok:
                sys.exit(0)
            else:
                sys.exit(1)
        elif not opt_ok:
            raise GsyncdError("not a valid option: " + confdata.opt)
        if confdata.op == 'get':
            gcnf.get(confdata.opt)
        elif confdata.op == 'set':
            gcnf.set(confdata.opt, confdata.val, confdata.rx)
        elif confdata.op == 'del':
            gcnf.delete(confdata.opt, confdata.rx)
        # when modifying checkpoint, it's important to make a log
        # of that, so in that case we go on to set up logging even
        # if its just config invocation
        if confdata.opt == 'checkpoint' and confdata.op in ('set', 'del') and \
           not confdata.rx:
            checkpoint_change = True
        if not checkpoint_change:
            return

    gconf.__dict__.update(defaults.__dict__)
    gcnf.update_to(gconf.__dict__)
    gconf.__dict__.update(opts.__dict__)
    gconf.configinterface = gcnf

    delete = rconf.get('delete')
    if delete:
        logging.info('geo-replication delete')
        # Delete pid file, status file, socket file
        cleanup_paths = []
        if getattr(gconf, 'pid_file', None):
            cleanup_paths.append(gconf.pid_file)

        if getattr(gconf, 'state_file', None):
            cleanup_paths.append(gconf.state_file)

        if getattr(gconf, 'state_detail_file', None):
            cleanup_paths.append(gconf.state_detail_file)

        if getattr(gconf, 'state_socket_unencoded', None):
            cleanup_paths.append(gconf.state_socket_unencoded)

        cleanup_paths.append(rconf['config_file'][:-11] + "*")

        # Cleanup changelog working dirs
        if getattr(gconf, 'working_dir', None):
            try:
                shutil.rmtree(gconf.working_dir)
            except (IOError, OSError):
                if sys.exc_info()[1].errno == ENOENT:
                    pass
                else:
                    raise GsyncdError(
                        'Error while removing working dir: %s' %
                        gconf.working_dir)

        for path in cleanup_paths:
            # To delete temp files
            for f in glob.glob(path + "*"):
                _unlink(f)
        return

    if restricted and gconf.allow_network:
        ssh_conn = os.getenv('SSH_CONNECTION')
        if not ssh_conn:
            # legacy env var
            ssh_conn = os.getenv('SSH_CLIENT')
        if ssh_conn:
            allowed_networks = [IPNetwork(a)
                                for a in gconf.allow_network.split(',')]
            client_ip = IPAddress(ssh_conn.split()[0])
            allowed = False
            for nw in allowed_networks:
                if client_ip in nw:
                    allowed = True
                    break
            if not allowed:
                raise GsyncdError("client IP address is not allowed")

    ffd = rconf.get('feedback_fd')
    if ffd:
        fcntl.fcntl(ffd, fcntl.F_SETFD, fcntl.FD_CLOEXEC)

    # normalize loglevel
    lvl0 = gconf.log_level
    if isinstance(lvl0, str):
        lvl1 = lvl0.upper()
        lvl2 = logging.getLevelName(lvl1)
        # I have _never_ _ever_ seen such an utterly braindead
        # error condition
        if lvl2 == "Level " + lvl1:
            raise GsyncdError('cannot recognize log level "%s"' % lvl0)
        gconf.log_level = lvl2

    if not privileged() and gconf.log_file_mbr:
        gconf.log_file = gconf.log_file_mbr

    if checkpoint_change:
        try:
            GLogger._gsyncd_loginit(log_file=gconf.log_file, label='conf')
            if confdata.op == 'set':
                logging.info('checkpoint %s set' % confdata.val)
                gcnf.delete('checkpoint_completed')
                gcnf.delete('checkpoint_target')
            elif confdata.op == 'del':
                logging.info('checkpoint info was reset')
                # if it is removing 'checkpoint' then we need
                # to remove 'checkpoint_completed' and 'checkpoint_target' too
                gcnf.delete('checkpoint_completed')
                gcnf.delete('checkpoint_target')

        except IOError:
            if sys.exc_info()[1].errno == ENOENT:
                # directory of log path is not present,
                # which happens if we get here from
                # a peer-multiplexed "config-set checkpoint"
                # (as that directory is created only on the
                # original node)
                pass
            else:
                raise
        return

    create = rconf.get('create')
    if create:
        if getattr(gconf, 'state_file', None):
            update_file(gconf.state_file, lambda f: f.write(create + '\n'))
        return

    go_daemon = rconf['go_daemon']
    be_monitor = rconf.get('monitor')
    be_agent = rconf.get('agent')

    rscs, local, remote = makersc(args)
    if not be_monitor and isinstance(remote, resource.SSH) and \
       go_daemon == 'should':
        go_daemon = 'postconn'
        log_file = None
    else:
        log_file = gconf.log_file
    if be_monitor:
        label = 'monitor'
    elif be_agent:
        label = 'agent'
    elif remote:
        # master
        label = gconf.local_path
    else:
        label = 'slave'
    startup(go_daemon=go_daemon, log_file=log_file, label=label)
    resource.Popen.init_errhandler()

    if be_agent:
        os.setsid()
        logging.debug('rpc_fd: %s' % repr(gconf.rpc_fd))
        return agent(Changelog(), gconf.rpc_fd)

    if be_monitor:
        return monitor(*rscs)

    logging.info("syncing: %s" % " -> ".join(r.url for r in rscs))
    if remote:
        go_daemon = remote.connect_remote(go_daemon=go_daemon)
        if go_daemon:
            startup(go_daemon=go_daemon, log_file=gconf.log_file)
            # complete remote connection in child
            remote.connect_remote(go_daemon='done')
    local.connect()
    if ffd:
        os.close(ffd)
    local.service_loop(*[r for r in [remote] if r])