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1/*
2 Copyright (C) Andrew Tridgell 1998
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17*/
18
19/* options parsing code */
20
21#include "rsync.h"
22
23
24int make_backups = 0;
25int whole_file = 0;
26int copy_links = 0;
27int preserve_links = 0;
28int preserve_hard_links = 0;
29int preserve_perms = 0;
30int preserve_devices = 0;
31int preserve_uid = 0;
32int preserve_gid = 0;
33int preserve_times = 0;
34int update_only = 0;
35int cvs_exclude = 0;
36int dry_run=0;
37int local_server=0;
38int ignore_times=0;
39int delete_mode=0;
40int delete_excluded=0;
41int one_file_system=0;
42int remote_version=0;
43int sparse_files=0;
44int do_compression=0;
45int am_root=0;
46int orig_umask=0;
47int relative_paths=0;
48int numeric_ids = 0;
49int force_delete = 0;
50int io_timeout = 0;
51int io_error = 0;
52int read_only = 0;
53int module_id = -1;
54int am_server = 0;
55int am_sender=0;
56int recurse = 0;
57int am_daemon=0;
58int do_stats=0;
59int do_progress=0;
60int keep_partial=0;
61int safe_symlinks=0;
62int copy_unsafe_links=0;
63int block_size=BLOCK_SIZE;
64int size_only=0;
65int bwlimit=0;
66int delete_after=0;
67int only_existing=0;
68int max_delete=0;
69int ignore_errors=0;
70int blocking_io=0;
71
72char *backup_suffix = BACKUP_SUFFIX;
73char *tmpdir = NULL;
74char *compare_dest = NULL;
75char *config_file = RSYNCD_CONF;
76char *shell_cmd = NULL;
77char *log_format = NULL;
78char *password_file = NULL;
79char *rsync_path = RSYNC_NAME;
80char *backup_dir = NULL;
81int rsync_port = RSYNC_PORT;
82
83int verbose = 0;
84int quiet = 0;
85int always_checksum = 0;
86int list_only = 0;
87
88struct in_addr socket_address = {INADDR_ANY};
89
90void usage(enum logcode F)
91{
92 rprintf(F,"rsync version %s Copyright Andrew Tridgell and Paul Mackerras\n\n",
93 VERSION);
94
95 rprintf(F,"rsync is a file transfer program capable of efficient remote update\nvia a fast differencing algorithm.\n\n");
96
97 rprintf(F,"Usage: rsync [OPTION]... SRC [SRC]... [USER@]HOST:DEST\n");
98 rprintf(F," or rsync [OPTION]... [USER@]HOST:SRC DEST\n");
99 rprintf(F," or rsync [OPTION]... SRC [SRC]... DEST\n");
100 rprintf(F," or rsync [OPTION]... [USER@]HOST::SRC [DEST]\n");
101 rprintf(F," or rsync [OPTION]... SRC [SRC]... [USER@]HOST::DEST\n");
102 rprintf(F," or rsync [OPTION]... rsync://[USER@]HOST[:PORT]/SRC [DEST]\n");
103 rprintf(F,"SRC on single-colon remote HOST will be expanded by remote shell\n");
104 rprintf(F,"SRC on server remote HOST may contain shell wildcards or multiple\n");
105 rprintf(F," sources separated by space as long as they have same top-level\n");
106 rprintf(F,"\nOptions\n");
107 rprintf(F," -v, --verbose increase verbosity\n");
108 rprintf(F," -q, --quiet decrease verbosity\n");
109 rprintf(F," -c, --checksum always checksum\n");
110 rprintf(F," -a, --archive archive mode\n");
111 rprintf(F," -r, --recursive recurse into directories\n");
112 rprintf(F," -R, --relative use relative path names\n");
113 rprintf(F," -b, --backup make backups (default %s suffix)\n",BACKUP_SUFFIX);
114 rprintf(F," --backup-dir make backups into this directory\n");
115 rprintf(F," --suffix=SUFFIX override backup suffix\n");
116 rprintf(F," -u, --update update only (don't overwrite newer files)\n");
117 rprintf(F," -l, --links preserve soft links\n");
118 rprintf(F," -L, --copy-links treat soft links like regular files\n");
119 rprintf(F," --copy-unsafe-links copy links outside the source tree\n");
120 rprintf(F," --safe-links ignore links outside the destination tree\n");
121 rprintf(F," -H, --hard-links preserve hard links\n");
122 rprintf(F," -p, --perms preserve permissions\n");
123 rprintf(F," -o, --owner preserve owner (root only)\n");
124 rprintf(F," -g, --group preserve group\n");
125 rprintf(F," -D, --devices preserve devices (root only)\n");
126 rprintf(F," -t, --times preserve times\n");
127 rprintf(F," -S, --sparse handle sparse files efficiently\n");
128 rprintf(F," -n, --dry-run show what would have been transferred\n");
129 rprintf(F," -W, --whole-file copy whole files, no incremental checks\n");
130 rprintf(F," -x, --one-file-system don't cross filesystem boundaries\n");
131 rprintf(F," -B, --block-size=SIZE checksum blocking size (default %d)\n",BLOCK_SIZE);
132 rprintf(F," -e, --rsh=COMMAND specify rsh replacement\n");
133 rprintf(F," --rsync-path=PATH specify path to rsync on the remote machine\n");
134 rprintf(F," -C, --cvs-exclude auto ignore files in the same way CVS does\n");
135 rprintf(F," --existing only update files that already exist\n");
136 rprintf(F," --delete delete files that don't exist on the sending side\n");
137 rprintf(F," --delete-excluded also delete excluded files on the receiving side\n");
138 rprintf(F," --delete-after delete after transferring, not before\n");
139 rprintf(F," --ignore-errors delete even if there are IO errors\n");
140 rprintf(F," --max-delete=NUM don't delete more than NUM files\n");
141 rprintf(F," --partial keep partially transferred files\n");
142 rprintf(F," --force force deletion of directories even if not empty\n");
143 rprintf(F," --numeric-ids don't map uid/gid values by user/group name\n");
144 rprintf(F," --timeout=TIME set IO timeout in seconds\n");
145 rprintf(F," -I, --ignore-times don't exclude files that match length and time\n");
146 rprintf(F," --size-only only use file size when determining if a file should be transferred\n");
147 rprintf(F," -T --temp-dir=DIR create temporary files in directory DIR\n");
148 rprintf(F," --compare-dest=DIR also compare destination files relative to DIR\n");
149 rprintf(F," -P equivalent to --partial --progress\n");
150 rprintf(F," -z, --compress compress file data\n");
151 rprintf(F," --exclude=PATTERN exclude files matching PATTERN\n");
152 rprintf(F," --exclude-from=FILE exclude patterns listed in FILE\n");
153 rprintf(F," --include=PATTERN don't exclude files matching PATTERN\n");
154 rprintf(F," --include-from=FILE don't exclude patterns listed in FILE\n");
155 rprintf(F," --version print version number\n");
156 rprintf(F," --daemon run as a rsync daemon\n");
157 rprintf(F," --address bind to the specified address\n");
158 rprintf(F," --config=FILE specify alternate rsyncd.conf file\n");
159 rprintf(F," --port=PORT specify alternate rsyncd port number\n");
160 rprintf(F," --blocking-io use blocking IO for the remote shell\n");
161 rprintf(F," --stats give some file transfer stats\n");
162 rprintf(F," --progress show progress during transfer\n");
163 rprintf(F," --log-format=FORMAT log file transfers using specified format\n");
164 rprintf(F," --password-file=FILE get password from FILE\n");
165 rprintf(F," --bwlimit=KBPS limit I/O bandwidth, KBytes per second\n");
166 rprintf(F," -h, --help show this help screen\n");
167
168 rprintf(F,"\n");
169
170 rprintf(F,"\nPlease see the rsync(1) and rsyncd.conf(5) man pages for full documentation\n");
171 rprintf(F,"See http://rsync.samba.org/ for updates and bug reports\n");
172}
173
174enum {OPT_VERSION, OPT_SUFFIX, OPT_SENDER, OPT_SERVER, OPT_EXCLUDE,
175 OPT_EXCLUDE_FROM, OPT_DELETE, OPT_DELETE_EXCLUDED, OPT_NUMERIC_IDS,
176 OPT_RSYNC_PATH, OPT_FORCE, OPT_TIMEOUT, OPT_DAEMON, OPT_CONFIG, OPT_PORT,
177 OPT_INCLUDE, OPT_INCLUDE_FROM, OPT_STATS, OPT_PARTIAL, OPT_PROGRESS,
178 OPT_COPY_UNSAFE_LINKS, OPT_SAFE_LINKS, OPT_COMPARE_DEST,
179 OPT_LOG_FORMAT, OPT_PASSWORD_FILE, OPT_SIZE_ONLY, OPT_ADDRESS,
180 OPT_DELETE_AFTER, OPT_EXISTING, OPT_MAX_DELETE, OPT_BACKUP_DIR,
181 OPT_IGNORE_ERRORS, OPT_BWLIMIT, OPT_BLOCKING_IO};
182
183static char *short_options = "oblLWHpguDCtcahvqrRIxnSe:B:T:zP";
184
185static struct option long_options[] = {
186 {"version", 0, 0, OPT_VERSION},
187 {"server", 0, 0, OPT_SERVER},
188 {"sender", 0, 0, OPT_SENDER},
189 {"existing", 0, 0, OPT_EXISTING},
190 {"delete", 0, 0, OPT_DELETE},
191 {"delete-excluded", 0, 0, OPT_DELETE_EXCLUDED},
192 {"force", 0, 0, OPT_FORCE},
193 {"numeric-ids", 0, 0, OPT_NUMERIC_IDS},
194 {"exclude", 1, 0, OPT_EXCLUDE},
195 {"exclude-from",1, 0, OPT_EXCLUDE_FROM},
196 {"include", 1, 0, OPT_INCLUDE},
197 {"include-from",1, 0, OPT_INCLUDE_FROM},
198 {"rsync-path", 1, 0, OPT_RSYNC_PATH},
199 {"password-file", 1, 0, OPT_PASSWORD_FILE},
200 {"one-file-system",0, 0, 'x'},
201 {"ignore-times",0, 0, 'I'},
202 {"size-only", 0, 0, OPT_SIZE_ONLY},
203 {"help", 0, 0, 'h'},
204 {"dry-run", 0, 0, 'n'},
205 {"sparse", 0, 0, 'S'},
206 {"cvs-exclude", 0, 0, 'C'},
207 {"archive", 0, 0, 'a'},
208 {"checksum", 0, 0, 'c'},
209 {"backup", 0, 0, 'b'},
210 {"update", 0, 0, 'u'},
211 {"verbose", 0, 0, 'v'},
212 {"quiet", 0, 0, 'q'},
213 {"recursive", 0, 0, 'r'},
214 {"relative", 0, 0, 'R'},
215 {"devices", 0, 0, 'D'},
216 {"perms", 0, 0, 'p'},
217 {"links", 0, 0, 'l'},
218 {"copy-links", 0, 0, 'L'},
219 {"copy-unsafe-links", 0, 0, OPT_COPY_UNSAFE_LINKS},
220 {"safe-links", 0, 0, OPT_SAFE_LINKS},
221 {"whole-file", 0, 0, 'W'},
222 {"hard-links", 0, 0, 'H'},
223 {"owner", 0, 0, 'o'},
224 {"group", 0, 0, 'g'},
225 {"times", 0, 0, 't'},
226 {"rsh", 1, 0, 'e'},
227 {"suffix", 1, 0, OPT_SUFFIX},
228 {"block-size", 1, 0, 'B'},
229 {"timeout", 1, 0, OPT_TIMEOUT},
230 {"temp-dir", 1, 0, 'T'},
231 {"compare-dest", 1, 0, OPT_COMPARE_DEST},
232 {"compress", 0, 0, 'z'},
233 {"daemon", 0, 0, OPT_DAEMON},
234 {"stats", 0, 0, OPT_STATS},
235 {"progress", 0, 0, OPT_PROGRESS},
236 {"partial", 0, 0, OPT_PARTIAL},
237 {"delete-after",0, 0, OPT_DELETE_AFTER},
238 {"ignore-errors",0, 0, OPT_IGNORE_ERRORS},
239 {"blocking-io" ,0, 0, OPT_BLOCKING_IO},
240 {"config", 1, 0, OPT_CONFIG},
241 {"port", 1, 0, OPT_PORT},
242 {"log-format", 1, 0, OPT_LOG_FORMAT},
243 {"bwlimit", 1, 0, OPT_BWLIMIT},
244 {"address", 1, 0, OPT_ADDRESS},
245 {"max-delete", 1, 0, OPT_MAX_DELETE},
246 {"backup-dir", 1, 0, OPT_BACKUP_DIR},
247 {0,0,0,0}};
248
249
250static char err_buf[100];
251
252void option_error(void)
253{
254 if (err_buf[0]) {
255 rprintf(FLOG,"%s", err_buf);
256 rprintf(FERROR,"%s", err_buf);
257 } else {
258 rprintf(FLOG,"Error parsing options - unsupported option?\n");
259 rprintf(FERROR,"Error parsing options - unsupported option?\n");
260 }
261 exit_cleanup(RERR_UNSUPPORTED);
262}
263
264/* check to see if we should refuse this option */
265static int check_refuse_options(char *ref, int opt)
266{
267 int i, len;
268 char *p;
269 const char *name;
270
271 for (i=0; long_options[i].name; i++) {
272 if (long_options[i].val == opt) break;
273 }
274
275 if (!long_options[i].name) return 0;
276
277 name = long_options[i].name;
278 len = strlen(name);
279
280 while ((p = strstr(ref,name))) {
281 if ((p==ref || p[-1]==' ') &&
282 (p[len] == ' ' || p[len] == 0)) {
283 slprintf(err_buf,sizeof(err_buf),
284 "The '%s' option is not supported by this server\n", name);
285 return 1;
286 }
287 ref += len;
288 }
289 return 0;
290}
291
292
293int parse_arguments(int argc, char *argv[], int frommain)
294{
295 int opt;
296 int option_index;
297 char *ref = lp_refuse_options(module_id);
298
299 while ((opt = getopt_long(argc, argv,
300 short_options, long_options, &option_index))
301 != -1) {
302
303 if (ref) {
304 if (check_refuse_options(ref, opt)) return 0;
305 }
306
307 switch (opt) {
308 case OPT_VERSION:
309 rprintf(FINFO,"rsync version %s protocol version %d\n\n",
310 VERSION,PROTOCOL_VERSION);
311 rprintf(FINFO,"Written by Andrew Tridgell and Paul Mackerras\n");
312 exit_cleanup(0);
313
314 case OPT_SUFFIX:
315 backup_suffix = optarg;
316 break;
317
318 case OPT_RSYNC_PATH:
319 rsync_path = optarg;
320 break;
321
322 case OPT_PASSWORD_FILE:
323 password_file =optarg;
324 break;
325
326 case 'I':
327 ignore_times = 1;
328 break;
329
330 case OPT_SIZE_ONLY:
331 size_only = 1;
332 break;
333
334 case 'x':
335 one_file_system=1;
336 break;
337
338 case OPT_DELETE:
339 delete_mode = 1;
340 break;
341
342 case OPT_EXISTING:
343 only_existing = 1;
344 break;
345
346 case OPT_DELETE_AFTER:
347 delete_after = 1;
348 break;
349
350 case OPT_DELETE_EXCLUDED:
351 delete_excluded = 1;
352 delete_mode = 1;
353 break;
354
355 case OPT_FORCE:
356 force_delete = 1;
357 break;
358
359 case OPT_NUMERIC_IDS:
360 numeric_ids = 1;
361 break;
362
363 case OPT_EXCLUDE:
364 add_exclude(optarg, 0);
365 break;
366
367 case OPT_INCLUDE:
368 add_exclude(optarg, 1);
369 break;
370
371 case OPT_EXCLUDE_FROM:
372 add_exclude_file(optarg,1, 0);
373 break;
374
375 case OPT_INCLUDE_FROM:
376 add_exclude_file(optarg,1, 1);
377 break;
378
379 case OPT_COPY_UNSAFE_LINKS:
380 copy_unsafe_links=1;
381 break;
382
383 case OPT_SAFE_LINKS:
384 safe_symlinks=1;
385 break;
386
387 case 'h':
388 usage(FINFO);
389 exit_cleanup(0);
390
391 case 'b':
392 make_backups=1;
393 break;
394
395 case 'n':
396 dry_run=1;
397 break;
398
399 case 'S':
400 sparse_files=1;
401 break;
402
403 case 'C':
404 cvs_exclude=1;
405 break;
406
407 case 'u':
408 update_only=1;
409 break;
410
411 case 'l':
412 preserve_links=1;
413 break;
414
415 case 'L':
416 copy_links=1;
417 break;
418
419 case 'W':
420 whole_file=1;
421 break;
422
423 case 'H':
424#if SUPPORT_HARD_LINKS
425 preserve_hard_links=1;
426#else
427 slprintf(err_buf,sizeof(err_buf),"hard links are not supported on this server\n");
428 rprintf(FERROR,"ERROR: hard links not supported on this platform\n");
429 return 0;
430#endif
431 break;
432
433 case 'p':
434 preserve_perms=1;
435 break;
436
437 case 'o':
438 preserve_uid=1;
439 break;
440
441 case 'g':
442 preserve_gid=1;
443 break;
444
445 case 'D':
446 preserve_devices=1;
447 break;
448
449 case 't':
450 preserve_times=1;
451 break;
452
453 case 'c':
454 always_checksum=1;
455 break;
456
457 case 'v':
458 verbose++;
459 break;
460
461 case 'q':
462 if (frommain) quiet++;
463 break;
464
465 case 'a':
466 recurse=1;
467#if SUPPORT_LINKS
468 preserve_links=1;
469#endif
470 preserve_perms=1;
471 preserve_times=1;
472 preserve_gid=1;
473 preserve_uid=1;
474 preserve_devices=1;
475 break;
476
477 case OPT_SERVER:
478 am_server = 1;
479 break;
480
481 case OPT_SENDER:
482 if (!am_server) {
483 usage(FERROR);
484 exit_cleanup(RERR_SYNTAX);
485 }
486 am_sender = 1;
487 break;
488
489 case 'r':
490 recurse = 1;
491 break;
492
493 case 'R':
494 relative_paths = 1;
495 break;
496
497 case 'e':
498 shell_cmd = optarg;
499 break;
500
501 case 'B':
502 block_size = atoi(optarg);
503 break;
504
505 case OPT_MAX_DELETE:
506 max_delete = atoi(optarg);
507 break;
508
509 case OPT_TIMEOUT:
510 io_timeout = atoi(optarg);
511 break;
512
513 case 'T':
514 tmpdir = optarg;
515 break;
516
517 case OPT_COMPARE_DEST:
518 compare_dest = optarg;
519 break;
520
521 case 'z':
522 do_compression = 1;
523 break;
524
525 case OPT_DAEMON:
526 am_daemon = 1;
527 break;
528
529 case OPT_STATS:
530 do_stats = 1;
531 break;
532
533 case OPT_PROGRESS:
534 do_progress = 1;
535 break;
536
537 case OPT_PARTIAL:
538 keep_partial = 1;
539 break;
540
541 case OPT_IGNORE_ERRORS:
542 ignore_errors = 1;
543 break;
544
545 case OPT_BLOCKING_IO:
546 blocking_io = 1;
547 break;
548
549 case 'P':
550 do_progress = 1;
551 keep_partial = 1;
552 break;
553
554 case OPT_CONFIG:
555 config_file = optarg;
556 break;
557
558 case OPT_PORT:
559 rsync_port = atoi(optarg);
560 break;
561
562 case OPT_LOG_FORMAT:
563 log_format = optarg;
564 break;
565
566 case OPT_BWLIMIT:
567 bwlimit = atoi(optarg);
568 break;
569
570 case OPT_ADDRESS:
571 {
572 struct in_addr *ia;
573 if ((ia = ip_address(optarg))) {
574 socket_address = *ia;
575 }
576 }
577 break;
578
579 case OPT_BACKUP_DIR:
580 backup_dir = optarg;
581 break;
582
583 default:
584 slprintf(err_buf,sizeof(err_buf),"unrecognised option\n");
585 return 0;
586 }
587 }
588 return 1;
589}
590
591
592/* need to pass all the valid options from the client to the server */
593
594void server_options(char **args,int *argc)
595{
596 int ac = *argc;
597 static char argstr[50];
598 static char bsize[30];
599 static char iotime[30];
600 static char mdelete[30];
601 static char bw[50];
602
603 int i, x;
604
605 args[ac++] = "--server";
606
607 if (!am_sender)
608 args[ac++] = "--sender";
609
610 x = 1;
611 argstr[0] = '-';
612 for (i=0;i<verbose;i++)
613 argstr[x++] = 'v';
614
615 /* the -q option is intentionally left out */
616 if (make_backups)
617 argstr[x++] = 'b';
618 if (update_only)
619 argstr[x++] = 'u';
620 if (dry_run)
621 argstr[x++] = 'n';
622 if (preserve_links)
623 argstr[x++] = 'l';
624 if (copy_links)
625 argstr[x++] = 'L';
626 if (whole_file)
627 argstr[x++] = 'W';
628 if (preserve_hard_links)
629 argstr[x++] = 'H';
630 if (preserve_uid)
631 argstr[x++] = 'o';
632 if (preserve_gid)
633 argstr[x++] = 'g';
634 if (preserve_devices)
635 argstr[x++] = 'D';
636 if (preserve_times)
637 argstr[x++] = 't';
638 if (preserve_perms)
639 argstr[x++] = 'p';
640 if (recurse)
641 argstr[x++] = 'r';
642 if (always_checksum)
643 argstr[x++] = 'c';
644 if (cvs_exclude)
645 argstr[x++] = 'C';
646 if (ignore_times)
647 argstr[x++] = 'I';
648 if (relative_paths)
649 argstr[x++] = 'R';
650 if (one_file_system)
651 argstr[x++] = 'x';
652 if (sparse_files)
653 argstr[x++] = 'S';
654 if (do_compression)
655 argstr[x++] = 'z';
656
657 /* this is a complete hack - blame Rusty
658
659 this is a hack to make the list_only (remote file list)
660 more useful */
661 if (list_only && !recurse)
662 argstr[x++] = 'r';
663
664 argstr[x] = 0;
665
666 if (x != 1) args[ac++] = argstr;
667
668 if (block_size != BLOCK_SIZE) {
669 slprintf(bsize,sizeof(bsize),"-B%d",block_size);
670 args[ac++] = bsize;
671 }
672
673 if (max_delete && am_sender) {
674 slprintf(mdelete,sizeof(mdelete),"--max-delete=%d",max_delete);
675 args[ac++] = mdelete;
676 }
677
678 if (io_timeout) {
679 slprintf(iotime,sizeof(iotime),"--timeout=%d",io_timeout);
680 args[ac++] = iotime;
681 }
682
683 if (bwlimit) {
684 slprintf(bw,sizeof(bw),"--bwlimit=%d",bwlimit);
685 args[ac++] = bw;
686 }
687
688 if (strcmp(backup_suffix, BACKUP_SUFFIX)) {
689 args[ac++] = "--suffix";
690 args[ac++] = backup_suffix;
691 }
692
693 if (delete_mode && !delete_excluded)
694 args[ac++] = "--delete";
695
696 if (delete_excluded)
697 args[ac++] = "--delete-excluded";
698
699 if (size_only)
700 args[ac++] = "--size-only";
701
702 if (keep_partial)
703 args[ac++] = "--partial";
704
705 if (force_delete)
706 args[ac++] = "--force";
707
708 if (delete_after)
709 args[ac++] = "--delete-after";
710
711 if (ignore_errors)
712 args[ac++] = "--ignore-errors";
713
714 if (copy_unsafe_links)
715 args[ac++] = "--copy-unsafe-links";
716
717 if (safe_symlinks)
718 args[ac++] = "--safe-links";
719
720 if (numeric_ids)
721 args[ac++] = "--numeric-ids";
722
723 if (only_existing && am_sender)
724 args[ac++] = "--existing";
725
726 if (tmpdir) {
727 args[ac++] = "--temp-dir";
728 args[ac++] = tmpdir;
729 }
730
731 if (backup_dir && am_sender) {
732 /* only the receiver needs this option, if we are the sender
733 * then we need to send it to the receiver.
734 */
735 args[ac++] = "--backup-dir";
736 args[ac++] = backup_dir;
737 }
738
739 if (compare_dest && am_sender) {
740 /* the server only needs this option if it is not the sender,
741 * and it may be an older version that doesn't know this
742 * option, so don't send it if client is the sender.
743 */
744 args[ac++] = "--compare-dest";
745 args[ac++] = compare_dest;
746 }
747
748
749 *argc = ac;
750}
751
Matt McCutchen's repository for rsync, the fast and versatile remote file copier