summaryrefslogtreecommitdiffstats
path: root/geo-replication/syncdaemon/gsyncd.py
blob: 932e37d1124feb0f37259ff6d64bf4ee43462364 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
#!/usr/bin/env python
#
# Copyright (c) 2011-2014 Red Hat, Inc. <http://www.redhat.com>
# This file is part of GlusterFS.

# This file is licensed to you under your choice of the GNU Lesser
# General Public License, version 3 or any later version (LGPLv3 or
# later), or the GNU General Public License, version 2 (GPLv2), in all
# cases as published by the Free Software Foundation.
#

import os
import os.path
import glob
import sys
import time
import logging
import shutil
import optparse
import fcntl
import fnmatch
from optparse import OptionParser, SUPPRESS_HELP
from logging import Logger, handlers
from errno import ENOENT

from ipaddr import IPAddress, IPNetwork

from gconf import gconf
from syncdutils import FreeObject, norm, grabpidfile, finalize
from syncdutils import log_raise_exception, privileged, boolify
from syncdutils import GsyncdError, select, set_term_handler
from configinterface import GConffile, upgrade_config_file, TMPL_CONFIG_FILE
import resource
from monitor import monitor
import xml.etree.ElementTree as XET
from subprocess import PIPE
import subprocess
from changelogagent import agent, Changelog
from gsyncdstatus import set_monitor_status, GeorepStatus, human_time_utc
from libcxattr import Xattr
import struct
from syncdutils import get_master_and_slave_data_from_args, lf

ParseError = XET.ParseError if hasattr(XET, 'ParseError') else SyntaxError


class GLogger(Logger):

    """Logger customizations for gsyncd.

    It implements a log format similar to that of glusterfs.
    """

    def makeRecord(self, name, level, *a):
        rv = Logger.makeRecord(self, name, level, *a)
        rv.nsecs = (rv.created - int(rv.created)) * 1000000
        fr = sys._getframe(4)
        callee = fr.f_locals.get('self')
        if callee:
            ctx = str(type(callee)).split("'")[1].split('.')[-1]
        else:
            ctx = '<top>'
        if not hasattr(rv, 'funcName'):
            rv.funcName = fr.f_code.co_name
        rv.lvlnam = logging.getLevelName(level)[0]
        rv.ctx = ctx
        return rv

    @classmethod
    def setup(cls, **kw):
        lbl = kw.get('label', "")
        if lbl:
            lbl = '(' + lbl + ')'
        lprm = {'datefmt': "%Y-%m-%d %H:%M:%S",
                'format': "[%(asctime)s.%(nsecs)d] %(lvlnam)s [%(module)s" +
                lbl + ":%(lineno)s:%(funcName)s] %(ctx)s: %(message)s"}
        lprm.update(kw)
        lvl = kw.get('level', logging.INFO)
        lprm['level'] = lvl
        logging.root = cls("root", lvl)
        logging.setLoggerClass(cls)
        logging.getLogger().handlers = []
        logging.getLogger().setLevel(lprm['level'])
        logging.Formatter.converter = time.gmtime  # Log in GMT/UTC time

        if 'filename' in lprm:
            try:
                logging_handler = handlers.WatchedFileHandler(lprm['filename'])
                formatter = logging.Formatter(fmt=lprm['format'],
                                              datefmt=lprm['datefmt'])
                logging_handler.setFormatter(formatter)
                logging.getLogger().addHandler(logging_handler)
            except AttributeError:
                # Python version < 2.6 will not have WatchedFileHandler
                # so fallback to logging without any handler.
                # Note: logrotate will not work if Python version is < 2.6
                logging.basicConfig(**lprm)
        else:
            # If filename not passed(not available in lprm) then it may be
            # streaming.(Ex: {"stream": "/dev/stdout"})
            logging.basicConfig(**lprm)

    @classmethod
    def _gsyncd_loginit(cls, **kw):
        lkw = {}
        if gconf.log_level:
            lkw['level'] = gconf.log_level
        if kw.get('log_file'):
            if kw['log_file'] in ('-', '/dev/stderr'):
                lkw['stream'] = sys.stderr
            elif kw['log_file'] == '/dev/stdout':
                lkw['stream'] = sys.stdout
            else:
                lkw['filename'] = kw['log_file']

        cls.setup(label=kw.get('label'), **lkw)

        lkw.update({'saved_label': kw.get('label')})
        gconf.log_metadata = lkw
        gconf.log_exit = True


# Given slave host and its volume name, get corresponding volume uuid
def slave_vol_uuid_get(host, vol):
    po = subprocess.Popen(['gluster', '--xml', '--remote-host=' + host,
                           'volume', 'info', vol], bufsize=0,
                          stdin=None, stdout=PIPE, stderr=PIPE)
    vix, err = po.communicate()
    if po.returncode != 0:
        logging.info(lf("Volume info failed, unable to get "
                        "volume uuid of slavevol, "
                        "returning empty string",
                        slavevol=vol,
                        slavehost=host,
                        error=po.returncode))
        return ""
    vi = XET.fromstring(vix)
    if vi.find('opRet').text != '0':
        logging.info(lf("Unable to get volume uuid of slavevol, "
                        "returning empty string",
                        slavevol=vol,
                        slavehost=host,
                        error=vi.find('opErrstr').text))
        return ""

    try:
        voluuid = vi.find("volInfo/volumes/volume/id").text
    except (ParseError, AttributeError, ValueError) as e:
        logging.info(lf("Parsing failed to volume uuid of slavevol, "
                        "returning empty string",
                        slavevol=vol,
                        slavehost=host,
                        error=e))
        voluuid = ""

    return voluuid


def startup(**kw):
    """set up logging, pidfile grabbing, daemonization"""
    if getattr(gconf, 'pid_file', None) and kw.get('go_daemon') != 'postconn':
        if not grabpidfile():
            sys.stderr.write("pidfile is taken, exiting.\n")
            sys.exit(2)
        gconf.pid_file_owned = True

    if kw.get('go_daemon') == 'should':
        x, y = os.pipe()
        gconf.cpid = os.fork()
        if gconf.cpid:
            os.close(x)
            sys.exit()
        os.close(y)
        os.setsid()
        dn = os.open(os.devnull, os.O_RDWR)
        for f in (sys.stdin, sys.stdout, sys.stderr):
            os.dup2(dn, f.fileno())
        if getattr(gconf, 'pid_file', None):
            if not grabpidfile(gconf.pid_file + '.tmp'):
                raise GsyncdError("cannot grab temporary pidfile")
            os.rename(gconf.pid_file + '.tmp', gconf.pid_file)
        # wait for parent to terminate
        # so we can start up with
        # no messing from the dirty
        # ol' bustard
        select((x,), (), ())
        os.close(x)

    GLogger._gsyncd_loginit(**kw)


def _unlink(path):
    try:
        os.unlink(path)
    except (OSError, IOError):
        if sys.exc_info()[1].errno == ENOENT:
            pass
        else:
            raise GsyncdError('Unlink error: %s' % path)


def main():
    """main routine, signal/exception handling boilerplates"""
    gconf.starttime = time.time()
    set_term_handler()
    GLogger.setup()
    excont = FreeObject(exval=0)
    try:
        try:
            main_i()
        except:
            log_raise_exception(excont)
    finally:
        finalize(exval=excont.exval)


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('--changelog-log-level', metavar='LVL', default="INFO")
    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('--access-mount', default=False, action='store_true')
    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('--sync-xattrs', default=True, action='store_true')
    op.add_option('--sync-acls', default=True, action='store_true')
    op.add_option('--log-rsync-performance', default=False,
                  action='store_true')
    op.add_option('--max-rsync-retries', type=int, default=10)
    # Max size of Changelogs to process per batch, Changelogs Processing is
    # not limited by the number of changelogs but instead based on
    # size of the changelog file, One sample changelog file size was 145408
    # with ~1000 CREATE and ~1000 DATA. 5 such files in one batch is 727040
    # If geo-rep worker crashes while processing a batch, it has to retry only
    # that batch since stime will get updated after each batch.
    op.add_option('--changelog-batch-size', type=int, default=727040)
    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-node', metavar='NODE', help=SUPPRESS_HELP, default='')
    op.add_option(
        '--local-node-id', metavar='NODEID', 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-port', metavar='PORT', type=int, default=22)
    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('--rsync-opt-ignore-missing-args', default="true")
    op.add_option('--rsync-opt-existing', default="true")
    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('--use-meta-volume', default=False, action='store_true')
    op.add_option('--meta-volume-mnt', metavar='N',
                  type=str, default="/var/run/gluster/shared_storage")
    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='0')

    # 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('--subvol-num', dest='subvol_num', 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('--slavevoluuid-get', type=str, dest="slavevoluuid_get",
                  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('--path-list', dest='path_list', action='callback',
                  type=str, callback=store_local)
    op.add_option('--reset-sync-time', default=False, action='store_true')
    op.add_option('--status-get', dest='status_get', 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'))
    op.add_option('--is-hottier', default=False, action='store_true')

    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',
                       'local_id', 'local_node', 'access_mount']
    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())
    # slave url cleanup, if input comes with vol uuid as follows
    # 'ssh://fvm1::gv2:07dfddca-94bb-4841-a051-a7e582811467'
    temp_args = []
    for arg in args:
        # Split based on ::
        data = arg.split("::")
        if len(data)>1:
            slavevol_name = data[1].split(":")[0]
            temp_args.append("%s::%s" % (data[0], slavevol_name))
        else:
            temp_args.append(data[0])
    args = temp_args
    args_orig = args[:]

    voluuid_get = rconf.get('slavevoluuid_get')
    if voluuid_get:
        slave_host, slave_vol = voluuid_get.split("::")
        svol_uuid = slave_vol_uuid_get(slave_host, slave_vol)
        print svol_uuid
        return

    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'] = TMPL_CONFIG_FILE

    # Upgrade Config File only if it is session conf file
    if rconf['config_file'] != TMPL_CONFIG_FILE:
        upgrade_config_file(rconf['config_file'], confdata)

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

    conf_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.op in ('set', 'del') and not confdata.rx:
            conf_change = True

        if not conf_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')
        # remove the stime xattr from all the brick paths so that
        # a re-create of a session will start sync all over again
        stime_xattr_name = getattr(gconf, 'master.stime_xattr_name', None)

        # 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)

        reset_sync_time = boolify(gconf.reset_sync_time)
        if reset_sync_time and stime_xattr_name:
            path_list = rconf.get('path_list')
            paths = []
            for p in path_list.split('--path='):
                stripped_path = p.strip()
                if stripped_path != "":
                    # set stime to (0,0) to trigger full volume content resync
                    # to slave on session recreation
                    # look at master.py::Xcrawl   hint: zero_zero
                    Xattr.lsetxattr(stripped_path, stime_xattr_name,
                                    struct.pack("!II", 0, 0))

        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 conf_change:
        try:
            GLogger._gsyncd_loginit(log_file=gconf.log_file, label='conf')
            gconf.log_exit = False

            if confdata.op == 'set':
                if confdata.opt == 'checkpoint':
                    logging.info(lf("Checkpoint Set",
                                    time=human_time_utc(confdata.val)))
                else:
                    logging.info(lf("Config Set",
                                    config=confdata.opt,
                                    value=confdata.val))
            elif confdata.op == 'del':
                if confdata.opt == 'checkpoint':
                    logging.info("Checkpoint Reset")
                else:
                    logging.info(lf("Config Reset",
                                    config=confdata.opt))
        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):
            set_monitor_status(gconf.state_file, create)

        try:
            GLogger._gsyncd_loginit(log_file=gconf.log_file, label='monitor')
            gconf.log_exit = False
            logging.info(lf("Monitor Status Change",
                            status=create))
        except IOError:
            if sys.exc_info()[1].errno == ENOENT:
                # If log dir not present
                pass
            else:
                raise
        return

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

    rscs, local, remote = makersc(args)

    status_get = rconf.get('status_get')
    if status_get:
        master_name, slave_data = get_master_and_slave_data_from_args(args)
        for brick in gconf.path:
            brick_status = GeorepStatus(gconf.state_file,
                                        gconf.local_node,
                                        brick,
                                        gconf.local_node_id,
                                        master_name,
                                        slave_data,
                                        getattr(gconf, "pid_file", None))
            checkpoint_time = int(getattr(gconf, "checkpoint", "0"))
            brick_status.print_status(checkpoint_time=checkpoint_time)
        return

    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 = gconf.local_path
    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(lf("RPC FD",
                         rpc_fd=repr(gconf.rpc_fd)))
        return agent(Changelog(), gconf.rpc_fd)

    if be_monitor:
        return monitor(*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:
        logging.info("Closing feedback fd, waking up the monitor")
        os.close(ffd)
    local.service_loop(*[r for r in [remote] if r])


if __name__ == "__main__":
    main()