35a6dc64f95053823792b05477b311b7d1a72e5a
[rsync.git] / options.c
1 /*  -*- c-file-style: "linux" -*-
2     
3     Copyright (C) 1998-2001 by Andrew Tridgell <tridge@samba.org>
4     Copyright (C) 2000-2001 by Martin Pool <mbp@samba.org>
5    
6    This program is free software; you can redistribute it and/or modify
7    it under the terms of the GNU General Public License as published by
8    the Free Software Foundation; either version 2 of the License, or
9    (at your option) any later version.
10    
11    This program is distributed in the hope that it will be useful,
12    but WITHOUT ANY WARRANTY; without even the implied warranty of
13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14    GNU General Public License for more details.
15    
16    You should have received a copy of the GNU General Public License
17    along with this program; if not, write to the Free Software
18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 #include "rsync.h"
22 #include "popt.h"
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 bwlimit=0;
66 int delete_after=0;
67 int only_existing=0;
68 int max_delete=0;
69 int ignore_errors=0;
70 #ifdef _WIN32
71 int modify_window=2;
72 #else
73 int modify_window=0;
74 #endif
75 int blocking_io=0;
76
77 char *backup_suffix = BACKUP_SUFFIX;
78 char *tmpdir = NULL;
79 char *compare_dest = NULL;
80 char *config_file = RSYNCD_CONF;
81 char *shell_cmd = NULL;
82 char *log_format = NULL;
83 char *password_file = NULL;
84 char *rsync_path = RSYNC_PATH;
85 char *backup_dir = NULL;
86 int rsync_port = RSYNC_PORT;
87
88 int verbose = 0;
89 int quiet = 0;
90 int always_checksum = 0;
91 int list_only = 0;
92
93 static int modify_window_set;
94
95
96 struct in_addr socket_address = {INADDR_ANY};
97
98
99 static void print_rsync_version(int f)
100 {
101         char const *got_socketpair = "no ";
102         char const *hardlinks = "no ";
103         char const *links = "no ";
104
105 #ifdef HAVE_SOCKETPAIR
106         got_socketpair = "";
107 #endif
108
109 #if SUPPORT_HARD_LINKS
110         hardlinks = "";
111 #endif
112
113 #if SUPPORT_LINKS
114         links = "";
115 #endif
116
117         rprintf(f, "%s  version %s  protocol version %d\n",
118                 RSYNC_NAME, VERSION, PROTOCOL_VERSION);
119         rprintf(f,
120                 "Copyright (C) 1996-2001 by Andrew Tridgell, Paul Mackerras and others\n");
121         rprintf(f, "Capabilities: %d-bit files, %ssocketpairs, "
122                 "%shard links, %ssymlinks\n\n",
123                 sizeof(int64) * 8,
124                 got_socketpair,
125                 hardlinks, links);
126
127 #ifdef NO_INT64
128         rprintf(f, "WARNING: no 64-bit integers on this platform!\n");
129 #endif
130 }
131
132
133 void usage(enum logcode F)
134 {
135   print_rsync_version(F);
136
137   rprintf(F,"rsync is a file transfer program capable of efficient remote update\nvia a fast differencing algorithm.\n\n");
138
139   rprintf(F,"Usage: rsync [OPTION]... SRC [SRC]... [USER@]HOST:DEST\n");
140   rprintf(F,"  or   rsync [OPTION]... [USER@]HOST:SRC DEST\n");
141   rprintf(F,"  or   rsync [OPTION]... SRC [SRC]... DEST\n");
142   rprintf(F,"  or   rsync [OPTION]... [USER@]HOST::SRC [DEST]\n");
143   rprintf(F,"  or   rsync [OPTION]... SRC [SRC]... [USER@]HOST::DEST\n");
144   rprintf(F,"  or   rsync [OPTION]... rsync://[USER@]HOST[:PORT]/SRC [DEST]\n");
145   rprintf(F,"SRC on single-colon remote HOST will be expanded by remote shell\n");
146   rprintf(F,"SRC on server remote HOST may contain shell wildcards or multiple\n");
147   rprintf(F,"  sources separated by space as long as they have same top-level\n");
148   rprintf(F,"\nOptions\n");
149   rprintf(F," -v, --verbose               increase verbosity\n");
150   rprintf(F," -q, --quiet                 decrease verbosity\n");
151   rprintf(F," -c, --checksum              always checksum\n");
152   rprintf(F," -a, --archive               archive mode\n");
153   rprintf(F," -r, --recursive             recurse into directories\n");
154   rprintf(F," -R, --relative              use relative path names\n");
155   rprintf(F," -b, --backup                make backups (default %s suffix)\n",BACKUP_SUFFIX);
156   rprintf(F,"     --backup-dir            make backups into this directory\n");
157   rprintf(F,"     --suffix=SUFFIX         override backup suffix\n");  
158   rprintf(F," -u, --update                update only (don't overwrite newer files)\n");
159   rprintf(F," -l, --links                 preserve soft links\n");
160   rprintf(F," -L, --copy-links            treat soft links like regular files\n");
161   rprintf(F,"     --copy-unsafe-links     copy links outside the source tree\n");
162   rprintf(F,"     --safe-links            ignore links outside the destination tree\n");
163   rprintf(F," -H, --hard-links            preserve hard links\n");
164   rprintf(F," -p, --perms                 preserve permissions\n");
165   rprintf(F," -o, --owner                 preserve owner (root only)\n");
166   rprintf(F," -g, --group                 preserve group\n");
167   rprintf(F," -D, --devices               preserve devices (root only)\n");
168   rprintf(F," -t, --times                 preserve times\n");  
169   rprintf(F," -S, --sparse                handle sparse files efficiently\n");
170   rprintf(F," -n, --dry-run               show what would have been transferred\n");
171   rprintf(F," -W, --whole-file            copy whole files, no incremental checks\n");
172   rprintf(F," -x, --one-file-system       don't cross filesystem boundaries\n");
173   rprintf(F," -B, --block-size=SIZE       checksum blocking size (default %d)\n",BLOCK_SIZE);  
174   rprintf(F," -e, --rsh=COMMAND           specify rsh replacement\n");
175   rprintf(F,"     --rsync-path=PATH       specify path to rsync on the remote machine\n");
176   rprintf(F," -C, --cvs-exclude           auto ignore files in the same way CVS does\n");
177   rprintf(F,"     --existing              only update files that already exist\n");
178   rprintf(F,"     --delete                delete files that don't exist on the sending side\n");
179   rprintf(F,"     --delete-excluded       also delete excluded files on the receiving side\n");
180   rprintf(F,"     --delete-after          delete after transferring, not before\n");
181   rprintf(F,"     --ignore-errors         delete even if there are IO errors\n");
182   rprintf(F,"     --max-delete=NUM        don't delete more than NUM files\n");
183   rprintf(F,"     --partial               keep partially transferred files\n");
184   rprintf(F,"     --force                 force deletion of directories even if not empty\n");
185   rprintf(F,"     --numeric-ids           don't map uid/gid values by user/group name\n");
186   rprintf(F,"     --timeout=TIME          set IO timeout in seconds\n");
187   rprintf(F," -I, --ignore-times          don't exclude files that match length and time\n");
188   rprintf(F,"     --size-only             only use file size when determining if a file should be transferred\n");
189   rprintf(F,"     --modify-window=NUM     Timestamp window (seconds) for file match (default=%d)\n",modify_window);
190   rprintf(F," -T  --temp-dir=DIR          create temporary files in directory DIR\n");
191   rprintf(F,"     --compare-dest=DIR      also compare destination files relative to DIR\n");
192   rprintf(F," -P                          equivalent to --partial --progress\n");
193   rprintf(F," -z, --compress              compress file data\n");
194   rprintf(F,"     --exclude=PATTERN       exclude files matching PATTERN\n");
195   rprintf(F,"     --exclude-from=FILE     exclude patterns listed in FILE\n");
196   rprintf(F,"     --include=PATTERN       don't exclude files matching PATTERN\n");
197   rprintf(F,"     --include-from=FILE     don't exclude patterns listed in FILE\n");
198   rprintf(F,"     --version               print version number\n");  
199   rprintf(F,"     --daemon                run as a rsync daemon\n");  
200   rprintf(F,"     --address               bind to the specified address\n");  
201   rprintf(F,"     --config=FILE           specify alternate rsyncd.conf file\n");  
202   rprintf(F,"     --port=PORT             specify alternate rsyncd port number\n");
203   rprintf(F,"     --blocking-io           use blocking IO for the remote shell\n");  
204   rprintf(F,"     --stats                 give some file transfer stats\n");  
205   rprintf(F,"     --progress              show progress during transfer\n");  
206   rprintf(F,"     --log-format=FORMAT     log file transfers using specified format\n");  
207   rprintf(F,"     --password-file=FILE    get password from FILE\n");
208   rprintf(F,"     --bwlimit=KBPS          limit I/O bandwidth, KBytes per second\n");
209   rprintf(F," -h, --help                  show this help screen\n");
210
211   rprintf(F,"\n");
212
213   rprintf(F,"\nPlease see the rsync(1) and rsyncd.conf(5) man pages for full documentation\n");
214   rprintf(F,"See http://rsync.samba.org/ for updates, bug reports, and answers\n");
215 }
216
217 enum {OPT_VERSION = 1000, OPT_SUFFIX, OPT_SENDER, OPT_SERVER, OPT_EXCLUDE,
218       OPT_EXCLUDE_FROM, OPT_DELETE, OPT_DELETE_EXCLUDED, OPT_NUMERIC_IDS,
219       OPT_RSYNC_PATH, OPT_FORCE, OPT_TIMEOUT, OPT_DAEMON, OPT_CONFIG, OPT_PORT,
220       OPT_INCLUDE, OPT_INCLUDE_FROM, OPT_STATS, OPT_PARTIAL, OPT_PROGRESS,
221       OPT_COPY_UNSAFE_LINKS, OPT_SAFE_LINKS, OPT_COMPARE_DEST,
222       OPT_LOG_FORMAT, OPT_PASSWORD_FILE, OPT_SIZE_ONLY, OPT_ADDRESS,
223       OPT_DELETE_AFTER, OPT_EXISTING, OPT_MAX_DELETE, OPT_BACKUP_DIR, 
224       OPT_IGNORE_ERRORS, OPT_BWLIMIT, OPT_BLOCKING_IO,
225       OPT_MODIFY_WINDOW};
226
227 static struct poptOption long_options[] = {
228   /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
229   {"version",          0,  POPT_ARG_NONE,   0,             OPT_VERSION},
230   {"suffix",           0,  POPT_ARG_STRING, &backup_suffix},
231   {"rsync-path",       0,  POPT_ARG_STRING, &rsync_path},
232   {"password-file",    0,  POPT_ARG_STRING, &password_file},
233   {"ignore-times",    'I', POPT_ARG_NONE,   &ignore_times},
234   {"size-only",        0,  POPT_ARG_NONE,   &size_only},
235   {"modify-window",    0,  POPT_ARG_INT,    &modify_window, OPT_MODIFY_WINDOW},
236   {"one-file-system", 'x', POPT_ARG_NONE,   &one_file_system},
237   {"delete",           0,  POPT_ARG_NONE,   &delete_mode},
238   {"existing",         0,  POPT_ARG_NONE,   &only_existing},
239   {"delete-after",     0,  POPT_ARG_NONE,   &delete_after},
240   {"delete-excluded",  0,  POPT_ARG_NONE,   0,              OPT_DELETE_EXCLUDED},
241   {"force",            0,  POPT_ARG_NONE,   &force_delete},
242   {"numeric-ids",      0,  POPT_ARG_NONE,   &numeric_ids},
243   {"exclude",          0,  POPT_ARG_STRING, 0,              OPT_EXCLUDE},
244   {"include",          0,  POPT_ARG_STRING, 0,              OPT_INCLUDE},
245   {"exclude-from",     0,  POPT_ARG_STRING, 0,              OPT_EXCLUDE_FROM},
246   {"include-from",     0,  POPT_ARG_STRING, 0,              OPT_INCLUDE_FROM},
247   {"safe-links",       0,  POPT_ARG_NONE,   &safe_symlinks},
248   {"help",            'h', POPT_ARG_NONE,   0,              'h'},
249   {"backup",          'b', POPT_ARG_NONE,   &make_backups},
250   {"dry-run",         'n', POPT_ARG_NONE,   &dry_run},
251   {"sparse",          'S', POPT_ARG_NONE,   &sparse_files},
252   {"cvs-exclude",     'C', POPT_ARG_NONE,   &cvs_exclude},
253   {"update",          'u', POPT_ARG_NONE,   &update_only},
254   {"links",           'l', POPT_ARG_NONE,   &preserve_links},
255   {"copy-links",      'L', POPT_ARG_NONE,   &copy_links},
256   {"whole",           'W', POPT_ARG_NONE,   &whole_file},
257   {"copy-unsafe-links", 0, POPT_ARG_NONE,   &copy_unsafe_links},
258   {"perms",           'p', POPT_ARG_NONE,   &preserve_perms},
259   {"owner",           'o', POPT_ARG_NONE,   &preserve_uid},
260   {"group",           'g', POPT_ARG_NONE,   &preserve_gid},
261   {"devices",         'D', POPT_ARG_NONE,   &preserve_devices},
262   {"times",           't', POPT_ARG_NONE,   &preserve_times},
263   {"checksum",        'c', POPT_ARG_NONE,   &always_checksum},
264   {"verbose",         'v', POPT_ARG_NONE,   0,               'v'},
265   {"quiet",           'q', POPT_ARG_NONE,   0,               'q'},
266   {"archive",         'a', POPT_ARG_NONE,   0,               'a'}, 
267   {"server",           0,  POPT_ARG_NONE,   &am_server},
268   {"sender",           0,  POPT_ARG_NONE,   0,               OPT_SENDER},
269   {"recurse",         'r', POPT_ARG_NONE,   &recurse},
270   {"relative",        'R', POPT_ARG_NONE,   &relative_paths},
271   {"rsh",             'e', POPT_ARG_STRING, &shell_cmd},
272   {"block-size",      'B', POPT_ARG_INT,    &block_size},
273   {"max-delete",       0,  POPT_ARG_INT,    &max_delete},
274   {"timeout",          0,  POPT_ARG_INT,    &io_timeout},
275   {"temp-dir",        'T', POPT_ARG_STRING, &tmpdir},
276   {"compare-dest",     0,  POPT_ARG_NONE,   &compare_dest},
277   /* TODO: Should this take an optional int giving the compression level? */
278   {"compress",        'z', POPT_ARG_NONE,   &do_compression},
279   {"daemon",           0,  POPT_ARG_NONE,   &am_daemon},
280   {"stats",            0,  POPT_ARG_NONE,   &do_stats},
281   {"progress",         0,  POPT_ARG_NONE,   &do_progress},
282   {"partial",          0,  POPT_ARG_NONE,   &keep_partial},
283   {"ignore-errors",    0,  POPT_ARG_NONE,   &ignore_errors},
284   {"blocking-io",      0,  POPT_ARG_NONE,   &blocking_io},
285   {0,                 'P', POPT_ARG_NONE,   0,               'P'},
286   {"config",           0,  POPT_ARG_STRING, &config_file},
287   {"port",             0,  POPT_ARG_INT,    &rsync_port},
288   {"log-format",       0,  POPT_ARG_STRING, &log_format},
289   {"bwlimit",          0,  POPT_ARG_INT,    &bwlimit},
290   {"address",          0,  POPT_ARG_STRING, 0,               OPT_ADDRESS},
291   {"backup-dir",       0,  POPT_ARG_STRING, &backup_dir},
292   {"hard-links",      'H', POPT_ARG_NONE,   &preserve_hard_links},
293   {0,0,0,0}
294 };
295
296
297 static char err_buf[100];
298
299
300 void option_error(void)
301 {
302         if (err_buf[0]) {
303                 rprintf(FLOG, "%s", err_buf);
304                 rprintf(FERROR, "%s: %s", RSYNC_NAME, err_buf);
305         } else {
306                 rprintf(FLOG,"Error parsing options - unsupported option?\n");
307                 rprintf(FERROR,"Error parsing options - unsupported option?\n");
308         }
309 }
310
311 /* check to see if we should refuse this option */
312 static int check_refuse_options(char *ref, int opt)
313 {
314         int i, len;
315         char *p;
316         const char *name;
317
318         for (i=0; long_options[i].longName; i++) {
319                 if (long_options[i].val == opt) break;
320         }
321         
322         if (!long_options[i].longName) return 0;
323
324         name = long_options[i].longName;
325         len = strlen(name);
326
327         while ((p = strstr(ref,name))) {
328                 if ((p==ref || p[-1]==' ') &&
329                     (p[len] == ' ' || p[len] == 0)) {
330                         snprintf(err_buf,sizeof(err_buf),
331                                  "The '%s' option is not supported by this server\n", name);
332                         return 1;
333                 }
334                 ref += len;
335         }
336         return 0;
337 }
338
339
340 static int count_args(char const **argv)
341 {
342         int i = 0;
343
344         while (argv[i] != NULL)
345                 i++;
346         
347         return i;
348 }
349
350
351 /* Process command line arguments.  Called on both local and remote.
352  * Returns if all options are OK, otherwise fills in err_buf and
353  * returns 0. */
354 int parse_arguments(int *argc, const char ***argv, int frommain)
355 {
356         int opt;
357         char *ref = lp_refuse_options(module_id);
358         poptContext pc;
359
360         /* TODO: Call poptReadDefaultConfig; handle errors. */
361
362         /* The context leaks in case of an error, but if there's a
363          * problem we always exit anyhow. */
364         pc = poptGetContext(RSYNC_NAME, *argc, *argv, long_options, 0);
365
366         while ((opt = poptGetNextOpt(pc)) != -1) {
367                 if (ref) {
368                         if (check_refuse_options(ref, opt)) return 0;
369                 }
370
371                 /* most options are handled automatically by popt;
372                  * only special cases are returned and listed here. */
373
374                 switch (opt) {
375                 case OPT_VERSION:
376                         print_rsync_version(FINFO);
377                         exit_cleanup(0);
378                         
379                 case OPT_MODIFY_WINDOW:
380                         /* The value has already been set by popt, but
381                          * we need to remember that we're using a
382                          * non-default setting. */
383                         modify_window_set = 1;
384                         break;
385                         
386                 case OPT_DELETE_EXCLUDED:
387                         delete_excluded = 1;
388                         delete_mode = 1;
389                         break;
390
391                 case OPT_EXCLUDE:
392                         add_exclude(poptGetOptArg(pc), 0);
393                         break;
394
395                 case OPT_INCLUDE:
396                         add_exclude(poptGetOptArg(pc), 1);
397                         break;
398
399                 case OPT_EXCLUDE_FROM:
400                         add_exclude_file(poptGetOptArg(pc), 1, 0);
401                         break;
402
403                 case OPT_INCLUDE_FROM:
404                         add_exclude_file(poptGetOptArg(pc), 1, 1);
405                         break;
406
407                 case 'h':
408                         usage(FINFO);
409                         exit_cleanup(0);
410
411                 case 'H':
412 #if SUPPORT_HARD_LINKS
413                         preserve_hard_links=1;
414 #else
415                         /* FIXME: Don't say "server" if this is
416                          * happening on the client. */
417                         /* FIXME: Why do we have the duplicated
418                          * rprintf?  Everybody who gets this message
419                          * ought to send it to the client and also to
420                          * the logs. */
421                         snprintf(err_buf,sizeof(err_buf),
422                                  "hard links are not supported on this %s\n",
423                                  am_server ? "server" : "client");
424                         rprintf(FERROR,"ERROR: hard links not supported on this platform\n");
425                         return 0;
426 #endif /* SUPPORT_HARD_LINKS */
427                         break;
428
429                 case 'v':
430                         verbose++;
431                         break;
432
433                 case 'q':
434                         if (frommain) quiet++;
435                         break;
436
437                 case 'a':
438                         recurse=1;
439 #if SUPPORT_LINKS
440                         preserve_links=1;
441 #endif
442                         preserve_perms=1;
443                         preserve_times=1;
444                         preserve_gid=1;
445                         preserve_uid=1;
446                         preserve_devices=1;
447                         break;
448
449                 case OPT_SENDER:
450                         if (!am_server) {
451                                 usage(FERROR);
452                                 exit_cleanup(RERR_SYNTAX);
453                         }
454                         am_sender = 1;
455                         break;
456
457                 case 'P':
458                         do_progress = 1;
459                         keep_partial = 1;
460                         break;
461
462                 case OPT_ADDRESS:
463                         {
464                                 struct in_addr *ia;
465                                 if ((ia = ip_address(optarg))) {
466                                         socket_address = *ia;
467                                 }
468                         }
469                         break;
470
471                 default:
472                         /* FIXME: If --daemon is specified, then errors for later
473                          * parameters seem to disappear. */
474                         snprintf(err_buf, sizeof(err_buf),
475                                  "%s%s: %s\n",
476                                  am_server ? "on remote machine: " : "",
477                                  poptBadOption(pc, POPT_BADOPTION_NOALIAS),
478                                  poptStrerror(opt));
479                         return 0;
480                 }
481         }
482
483         *argv = poptGetArgs(pc);
484         if (*argv)
485                 *argc = count_args(*argv);
486         else
487                 *argc = 0;
488
489         return 1;
490 }
491
492
493 /* Construct a filtered list of options to pass through from the
494  * client to the server */
495 void server_options(char **args,int *argc)
496 {
497         int ac = *argc;
498         static char argstr[50];
499         static char bsize[30];
500         static char iotime[30];
501         static char mdelete[30];
502         static char mwindow[30];
503         static char bw[50];
504
505         int i, x;
506
507         args[ac++] = "--server";
508
509         if (!am_sender)
510                 args[ac++] = "--sender";
511
512         x = 1;
513         argstr[0] = '-';
514         for (i=0;i<verbose;i++)
515                 argstr[x++] = 'v';
516
517         /* the -q option is intentionally left out */
518         if (make_backups)
519                 argstr[x++] = 'b';
520         if (update_only)
521                 argstr[x++] = 'u';
522         if (dry_run)
523                 argstr[x++] = 'n';
524         if (preserve_links)
525                 argstr[x++] = 'l';
526         if (copy_links)
527                 argstr[x++] = 'L';
528         if (whole_file)
529                 argstr[x++] = 'W';
530         if (preserve_hard_links)
531                 argstr[x++] = 'H';
532         if (preserve_uid)
533                 argstr[x++] = 'o';
534         if (preserve_gid)
535                 argstr[x++] = 'g';
536         if (preserve_devices)
537                 argstr[x++] = 'D';
538         if (preserve_times)
539                 argstr[x++] = 't';
540         if (preserve_perms)
541                 argstr[x++] = 'p';
542         if (recurse)
543                 argstr[x++] = 'r';
544         if (always_checksum)
545                 argstr[x++] = 'c';
546         if (cvs_exclude)
547                 argstr[x++] = 'C';
548         if (ignore_times)
549                 argstr[x++] = 'I';
550         if (relative_paths)
551                 argstr[x++] = 'R';
552         if (one_file_system)
553                 argstr[x++] = 'x';
554         if (sparse_files)
555                 argstr[x++] = 'S';
556         if (do_compression)
557                 argstr[x++] = 'z';
558
559         /* this is a complete hack - blame Rusty 
560
561            this is a hack to make the list_only (remote file list)
562            more useful */
563         if (list_only && !recurse) 
564                 argstr[x++] = 'r';
565
566         argstr[x] = 0;
567
568         if (x != 1) args[ac++] = argstr;
569
570         if (block_size != BLOCK_SIZE) {
571                 snprintf(bsize,sizeof(bsize),"-B%d",block_size);
572                 args[ac++] = bsize;
573         }    
574
575         if (max_delete && am_sender) {
576                 snprintf(mdelete,sizeof(mdelete),"--max-delete=%d",max_delete);
577                 args[ac++] = mdelete;
578         }    
579
580         if (io_timeout) {
581                 snprintf(iotime,sizeof(iotime),"--timeout=%d",io_timeout);
582                 args[ac++] = iotime;
583         }    
584
585         if (bwlimit) {
586                 snprintf(bw,sizeof(bw),"--bwlimit=%d",bwlimit);
587                 args[ac++] = bw;
588         }
589
590         if (strcmp(backup_suffix, BACKUP_SUFFIX)) {
591                 args[ac++] = "--suffix";
592                 args[ac++] = backup_suffix;
593         }
594
595         if (delete_mode && !delete_excluded)
596                 args[ac++] = "--delete";
597
598         if (delete_excluded)
599                 args[ac++] = "--delete-excluded";
600
601         if (size_only)
602                 args[ac++] = "--size-only";
603
604         if (modify_window_set) {
605                 snprintf(mwindow,sizeof(mwindow),"--modify-window=%d",
606                          modify_window);
607                 args[ac++] = mwindow;
608         }
609
610         if (keep_partial)
611                 args[ac++] = "--partial";
612
613         if (force_delete)
614                 args[ac++] = "--force";
615
616         if (delete_after)
617                 args[ac++] = "--delete-after";
618
619         if (ignore_errors)
620                 args[ac++] = "--ignore-errors";
621
622         if (copy_unsafe_links)
623                 args[ac++] = "--copy-unsafe-links";
624
625         if (safe_symlinks)
626                 args[ac++] = "--safe-links";
627
628         if (numeric_ids)
629                 args[ac++] = "--numeric-ids";
630
631         if (only_existing && am_sender)
632                 args[ac++] = "--existing";
633
634         if (tmpdir) {
635                 args[ac++] = "--temp-dir";
636                 args[ac++] = tmpdir;
637         }
638
639         if (backup_dir && am_sender) {
640                 /* only the receiver needs this option, if we are the sender
641                  *   then we need to send it to the receiver.
642                  */
643                 args[ac++] = "--backup-dir";
644                 args[ac++] = backup_dir;
645         }
646
647         if (compare_dest && am_sender) {
648                 /* the server only needs this option if it is not the sender,
649                  *   and it may be an older version that doesn't know this
650                  *   option, so don't send it if client is the sender.
651                  */
652                 args[ac++] = "--compare-dest";
653                 args[ac++] = compare_dest;
654         }
655
656
657         *argc = ac;
658 }
659