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