| 1 | This patch adds the --detect-renamed option which makes rsync notice files |
| 2 | that either (1) match in size & modify-time (plus the basename, if possible) |
| 3 | or (2) match in size & checksum (when --checksum was also specified) and use |
| 4 | each match as an alternate basis file to speed up the transfer. |
| 5 | |
| 6 | The algorithm attempts to scan the receiving-side's files in an efficient |
| 7 | manner. If --delete[-before] is enabled, we'll take advantage of the |
| 8 | pre-transfer delete pass to prepare any alternate-basis-file matches we |
| 9 | might find. If --delete-before is not enabled, rsync does the rename scan |
| 10 | during the regular file-sending scan (scanning each directory right before |
| 11 | the generator starts updating files from that dir). In this latter mode, |
| 12 | rsync might delay the updating of a file (if no alternate-basis match was |
| 13 | yet found) until the full scan of the receiving side is complete, at which |
| 14 | point any delayed files are processed. |
| 15 | |
| 16 | I chose to hard-link the alternate-basis files into a ".~tmp~" subdir that |
| 17 | takes advantage of rsync's pre-existing partial-dir logic. This uses less |
| 18 | memory than trying to keep track of the matches internally, and also allows |
| 19 | any deletions or file-updates to occur normally without interfering with |
| 20 | these alternate-basis discoveries. |
| 21 | |
| 22 | After applying this patch, run these commands for a successful build: |
| 23 | |
| 24 | ./prepare-source |
| 25 | ./configure (optional if already run) |
| 26 | make |
| 27 | |
| 28 | TODO: |
| 29 | |
| 30 | We need to never return a match from fattr_find() that has a basis |
| 31 | file. This will ensure that we don't try to give a renamed file to |
| 32 | a file that can't use it, while missing out on giving it to a file |
| 33 | that could use it. |
| 34 | |
| 35 | --- old/flist.c |
| 36 | +++ new/flist.c |
| 37 | @@ -56,6 +56,7 @@ extern int implied_dirs; |
| 38 | extern int prune_empty_dirs; |
| 39 | extern int copy_links; |
| 40 | extern int copy_unsafe_links; |
| 41 | +extern int detect_renamed; |
| 42 | extern int protocol_version; |
| 43 | extern int sanitize_paths; |
| 44 | extern const char *io_write_phase; |
| 45 | @@ -74,6 +75,8 @@ int checksum_len; |
| 46 | dev_t filesystem_dev; /* used to implement -x */ |
| 47 | unsigned int file_struct_len; |
| 48 | |
| 49 | +struct file_list the_fattr_list; |
| 50 | + |
| 51 | static char empty_sum[MD4_SUM_LENGTH]; |
| 52 | static int flist_count_offset; |
| 53 | |
| 54 | @@ -260,6 +263,44 @@ static mode_t from_wire_mode(int mode) |
| 55 | return (mode_t)mode; |
| 56 | } |
| 57 | |
| 58 | +static int fattr_compare(struct file_struct **file1, struct file_struct **file2) |
| 59 | +{ |
| 60 | + struct file_struct *f1 = *file1; |
| 61 | + struct file_struct *f2 = *file2; |
| 62 | + int diff; |
| 63 | + |
| 64 | + if (!f1->basename || !S_ISREG(f1->mode) || !f1->length) { |
| 65 | + if (!f2->basename || !S_ISREG(f2->mode) || !f2->length) |
| 66 | + return 0; |
| 67 | + return 1; |
| 68 | + } |
| 69 | + if (!f2->basename || !S_ISREG(f2->mode) || !f2->length) |
| 70 | + return -1; |
| 71 | + |
| 72 | + /* Don't use diff for values that are longer than an int. */ |
| 73 | + if (f1->length != f2->length) |
| 74 | + return f1->length < f2->length ? -1 : 1; |
| 75 | + |
| 76 | + if (always_checksum) { |
| 77 | + diff = u_memcmp(f1->u.sum, f2->u.sum, checksum_len); |
| 78 | + if (diff) |
| 79 | + return diff; |
| 80 | + } else if (f1->modtime != f2->modtime) |
| 81 | + return f1->modtime < f2->modtime ? -1 : 1; |
| 82 | + |
| 83 | + diff = u_strcmp(f1->basename, f2->basename); |
| 84 | + if (diff) |
| 85 | + return diff; |
| 86 | + |
| 87 | + if (f1->dirname == f2->dirname) |
| 88 | + return 0; |
| 89 | + if (!f1->dirname) |
| 90 | + return -1; |
| 91 | + if (!f2->dirname) |
| 92 | + return 1; |
| 93 | + return u_strcmp(f1->dirname, f2->dirname); |
| 94 | +} |
| 95 | + |
| 96 | static void send_directory(int f, struct file_list *flist, |
| 97 | char *fbuf, int len); |
| 98 | |
| 99 | @@ -1388,6 +1429,25 @@ struct file_list *recv_file_list(int f) |
| 100 | |
| 101 | clean_flist(flist, relative_paths, 1); |
| 102 | |
| 103 | + if (detect_renamed) { |
| 104 | + int j = flist->count; |
| 105 | + the_fattr_list.count = j; |
| 106 | + the_fattr_list.files = new_array(struct file_struct *, j); |
| 107 | + if (!the_fattr_list.files) |
| 108 | + goto oom; |
| 109 | + memcpy(the_fattr_list.files, flist->files, |
| 110 | + j * sizeof (struct file_struct *)); |
| 111 | + qsort(the_fattr_list.files, j, |
| 112 | + sizeof the_fattr_list.files[0], (int (*)())fattr_compare); |
| 113 | + the_fattr_list.low = 0; |
| 114 | + while (j-- > 0) { |
| 115 | + struct file_struct *fp = the_fattr_list.files[j]; |
| 116 | + if (fp->basename && S_ISREG(fp->mode) && fp->length) |
| 117 | + break; |
| 118 | + } |
| 119 | + the_fattr_list.high = j; |
| 120 | + } |
| 121 | + |
| 122 | if (f >= 0) { |
| 123 | recv_uid_list(f, flist); |
| 124 | |
| 125 | --- old/generator.c |
| 126 | +++ new/generator.c |
| 127 | @@ -77,6 +77,7 @@ extern char *basis_dir[]; |
| 128 | extern int compare_dest; |
| 129 | extern int copy_dest; |
| 130 | extern int link_dest; |
| 131 | +extern int detect_renamed; |
| 132 | extern int whole_file; |
| 133 | extern int list_only; |
| 134 | extern int read_batch; |
| 135 | @@ -92,14 +93,17 @@ extern char *backup_dir; |
| 136 | extern char *backup_suffix; |
| 137 | extern int backup_suffix_len; |
| 138 | extern struct file_list *the_file_list; |
| 139 | +extern struct file_list the_fattr_list; |
| 140 | extern struct filter_list_struct server_filter_list; |
| 141 | |
| 142 | static int deletion_count = 0; /* used to implement --max-delete */ |
| 143 | +static int unexplored_dirs = 1; |
| 144 | static int can_link_symlinks = 1; /* start out optimistic */ |
| 145 | static int can_link_devices = 1; |
| 146 | |
| 147 | -/* For calling delete_file() */ |
| 148 | +/* For calling delete_item() and delete_in_dir() */ |
| 149 | #define DEL_FORCE_RECURSE (1<<1) /* recurse even w/o --force */ |
| 150 | +#define DEL_NO_DELETIONS (1<<2) |
| 151 | #define DEL_TERSE (1<<3) |
| 152 | |
| 153 | |
| 154 | @@ -109,12 +113,120 @@ static int is_backup_file(char *fn) |
| 155 | return k > 0 && strcmp(fn+k, backup_suffix) == 0; |
| 156 | } |
| 157 | |
| 158 | +/* Search for a regular file that matches either (1) the size & modified |
| 159 | + * time (plus the basename, if possible) or (2) the size & checksum. If |
| 160 | + * we find an exact match down to the dirname, return -1 because we found |
| 161 | + * an up-to-date file in the transfer, not a renamed file. */ |
| 162 | +static int fattr_find(struct file_struct *f, char *fname, alloc_pool_t pool) |
| 163 | +{ |
| 164 | + int low = the_fattr_list.low, high = the_fattr_list.high; |
| 165 | + int mid, ok_match = -1, good_match = -1; |
| 166 | + struct file_struct *fmid; |
| 167 | + int diff; |
| 168 | + |
| 169 | + while (low <= high) { |
| 170 | + mid = (low + high) / 2; |
| 171 | + fmid = the_fattr_list.files[mid]; |
| 172 | + if (fmid->length != f->length) { |
| 173 | + if (fmid->length < f->length) |
| 174 | + low = mid + 1; |
| 175 | + else |
| 176 | + high = mid - 1; |
| 177 | + continue; |
| 178 | + } |
| 179 | + if (always_checksum) { |
| 180 | + if (!f->u.sum) { |
| 181 | + if (fmid->modtime == f->modtime |
| 182 | + && f_name_cmp(fmid, f) == 0) |
| 183 | + return -1; /* assume we can't help */ |
| 184 | + f->u.sum = pool_alloc(pool, MD4_SUM_LENGTH, |
| 185 | + "fattr_find"); |
| 186 | + file_checksum(fname, f->u.sum, f->length); |
| 187 | + } |
| 188 | + diff = u_memcmp(fmid->u.sum, f->u.sum, checksum_len); |
| 189 | + if (diff) { |
| 190 | + if (diff < 0) |
| 191 | + low = mid + 1; |
| 192 | + else |
| 193 | + high = mid - 1; |
| 194 | + continue; |
| 195 | + } |
| 196 | + } else { |
| 197 | + if (fmid->modtime != f->modtime) { |
| 198 | + if (fmid->modtime < f->modtime) |
| 199 | + low = mid + 1; |
| 200 | + else |
| 201 | + high = mid - 1; |
| 202 | + continue; |
| 203 | + } |
| 204 | + } |
| 205 | + ok_match = mid; |
| 206 | + diff = u_strcmp(fmid->basename, f->basename); |
| 207 | + if (diff == 0) { |
| 208 | + good_match = mid; |
| 209 | + if (fmid->dirname == f->dirname) |
| 210 | + return -1; /* file is up-to-date */ |
| 211 | + if (!fmid->dirname) { |
| 212 | + low = mid + 1; |
| 213 | + continue; |
| 214 | + } |
| 215 | + if (!f->dirname) { |
| 216 | + high = mid - 1; |
| 217 | + continue; |
| 218 | + } |
| 219 | + diff = u_strcmp(fmid->dirname, f->dirname); |
| 220 | + if (diff == 0) |
| 221 | + return -1; /* file is up-to-date */ |
| 222 | + } |
| 223 | + if (diff < 0) |
| 224 | + low = mid + 1; |
| 225 | + else |
| 226 | + high = mid - 1; |
| 227 | + } |
| 228 | + |
| 229 | + return good_match >= 0 ? good_match : ok_match; |
| 230 | +} |
| 231 | + |
| 232 | +static void look_for_rename(struct file_struct *file, char *fname, |
| 233 | + alloc_pool_t pool) |
| 234 | +{ |
| 235 | + struct file_struct *fp; |
| 236 | + char *partialptr, *fn; |
| 237 | + STRUCT_STAT st; |
| 238 | + int ndx; |
| 239 | + |
| 240 | + if ((ndx = fattr_find(file, fname, pool)) < 0) |
| 241 | + return; |
| 242 | + |
| 243 | + fp = the_fattr_list.files[ndx]; |
| 244 | + fn = f_name(fp, NULL); |
| 245 | + /* We don't provide an alternate-basis file if there is a basis file. */ |
| 246 | + if (link_stat(fn, &st, 0) == 0) |
| 247 | + return; |
| 248 | + if ((partialptr = partial_dir_fname(fn)) == NULL |
| 249 | + || !handle_partial_dir(partialptr, PDIR_CREATE)) |
| 250 | + return; |
| 251 | + |
| 252 | + /* We only use the file if we can hard-link it into our tmp dir. */ |
| 253 | + if (link(fname, partialptr) == 0) { |
| 254 | + if (verbose > 2) { |
| 255 | + rprintf(FINFO, "found renamed: %s => %s\n", |
| 256 | + fname, partialptr); |
| 257 | + } |
| 258 | + return; |
| 259 | + } |
| 260 | + |
| 261 | + if (errno != EEXIST) |
| 262 | + handle_partial_dir(partialptr, PDIR_DELETE); |
| 263 | +} |
| 264 | |
| 265 | /* Delete a file or directory. If DEL_FORCE_RECURSE is set in the flags, or if |
| 266 | * force_delete is set, this will delete recursively. |
| 267 | * |
| 268 | * Note that fname must point to a MAXPATHLEN buffer if the mode indicates it's |
| 269 | * a directory! (The buffer is used for recursion, but returned unchanged.) |
| 270 | + * |
| 271 | + * Also Note: --detect-rename may use this routine with DEL_NO_DELETIONS set! |
| 272 | */ |
| 273 | static int delete_item(char *fname, int mode, int flags) |
| 274 | { |
| 275 | @@ -125,6 +237,8 @@ static int delete_item(char *fname, int |
| 276 | char *p; |
| 277 | |
| 278 | if (!S_ISDIR(mode)) { |
| 279 | + if (flags & DEL_NO_DELETIONS) |
| 280 | + return 0; |
| 281 | if (max_delete && ++deletion_count > max_delete) |
| 282 | return 0; |
| 283 | if (make_backups && (backup_dir || !is_backup_file(fname))) |
| 284 | @@ -147,6 +261,7 @@ static int delete_item(char *fname, int |
| 285 | |
| 286 | zap_dir = flags & DEL_FORCE_RECURSE || force_delete; |
| 287 | if ((max_delete && ++deletion_count > max_delete) |
| 288 | + || flags & DEL_NO_DELETIONS |
| 289 | || (dry_run && zap_dir)) { |
| 290 | ok = 0; |
| 291 | errno = ENOTEMPTY; |
| 292 | @@ -189,6 +304,8 @@ static int delete_item(char *fname, int |
| 293 | continue; |
| 294 | |
| 295 | strlcpy(p, fp->basename, remainder); |
| 296 | + if (detect_renamed && S_ISREG(fp->mode)) |
| 297 | + look_for_rename(fp, fname, dirlist->file_pool); |
| 298 | delete_item(fname, fp->mode, flags & ~DEL_TERSE); |
| 299 | } |
| 300 | flist_free(dirlist); |
| 301 | @@ -197,7 +314,8 @@ static int delete_item(char *fname, int |
| 302 | |
| 303 | pop_local_filters(save_filters); |
| 304 | |
| 305 | - if (max_delete && ++deletion_count > max_delete) |
| 306 | + if (flags & DEL_NO_DELETIONS |
| 307 | + || (max_delete && ++deletion_count > max_delete)) |
| 308 | return 0; |
| 309 | |
| 310 | if (do_rmdir(fname) == 0) { |
| 311 | @@ -217,15 +335,19 @@ static int delete_item(char *fname, int |
| 312 | * all the --delete-WHEN options. Note that the fbuf pointer must point to a |
| 313 | * MAXPATHLEN buffer with the name of the directory in it (the functions we |
| 314 | * call will append names onto the end, but the old dir value will be restored |
| 315 | - * on exit). */ |
| 316 | + * on exit). |
| 317 | + * |
| 318 | + * Note: --detect-rename may use this routine with DEL_NO_DELETIONS set! |
| 319 | + */ |
| 320 | static void delete_in_dir(struct file_list *flist, char *fbuf, |
| 321 | - struct file_struct *file, STRUCT_STAT *stp) |
| 322 | + struct file_struct *file, STRUCT_STAT *stp, int flags) |
| 323 | { |
| 324 | static int min_depth = MAXPATHLEN, cur_depth = -1; |
| 325 | static void *filt_array[MAXPATHLEN/2+1]; |
| 326 | static int already_warned = 0; |
| 327 | struct file_list *dirlist; |
| 328 | - char delbuf[MAXPATHLEN]; |
| 329 | + char *p, delbuf[MAXPATHLEN]; |
| 330 | + unsigned remainder; |
| 331 | int dlen, i; |
| 332 | |
| 333 | if (!flist) { |
| 334 | @@ -239,6 +361,8 @@ static void delete_in_dir(struct file_li |
| 335 | if (verbose > 2) |
| 336 | rprintf(FINFO, "delete_in_dir(%s)\n", fbuf); |
| 337 | |
| 338 | + flags |= DEL_FORCE_RECURSE; |
| 339 | + |
| 340 | if (allowed_lull) |
| 341 | maybe_send_keepalive(); |
| 342 | |
| 343 | @@ -246,12 +370,14 @@ static void delete_in_dir(struct file_li |
| 344 | return; /* Impossible... */ |
| 345 | |
| 346 | if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) { |
| 347 | - if (already_warned) |
| 348 | + if (!already_warned) { |
| 349 | + rprintf(FINFO, |
| 350 | + "IO error encountered -- skipping file deletion\n"); |
| 351 | + already_warned = 1; |
| 352 | + } |
| 353 | + if (!detect_renamed) |
| 354 | return; |
| 355 | - rprintf(FINFO, |
| 356 | - "IO error encountered -- skipping file deletion\n"); |
| 357 | - already_warned = 1; |
| 358 | - return; |
| 359 | + flags |= DEL_NO_DELETIONS; |
| 360 | } |
| 361 | |
| 362 | while (cur_depth >= file->dir.depth && cur_depth >= min_depth) |
| 363 | @@ -262,6 +388,9 @@ static void delete_in_dir(struct file_li |
| 364 | dlen = strlen(fbuf); |
| 365 | filt_array[cur_depth] = push_local_filters(fbuf, dlen); |
| 366 | |
| 367 | + if (detect_renamed) |
| 368 | + unexplored_dirs--; |
| 369 | + |
| 370 | if (one_file_system) { |
| 371 | if (file->flags & FLAG_TOP_DIR) |
| 372 | filesystem_dev = stp->st_dev; |
| 373 | @@ -271,18 +400,30 @@ static void delete_in_dir(struct file_li |
| 374 | |
| 375 | dirlist = get_dirlist(fbuf, dlen, 0); |
| 376 | |
| 377 | + p = fbuf + dlen; |
| 378 | + if (dlen != 1 || *fbuf != '/') |
| 379 | + *p++ = '/'; |
| 380 | + remainder = MAXPATHLEN - (p - fbuf); |
| 381 | + |
| 382 | /* If an item in dirlist is not found in flist, delete it |
| 383 | * from the filesystem. */ |
| 384 | for (i = dirlist->count; i--; ) { |
| 385 | struct file_struct *fp = dirlist->files[i]; |
| 386 | if (!fp->basename || fp->flags & FLAG_MOUNT_POINT) |
| 387 | continue; |
| 388 | + if (detect_renamed && S_ISREG(fp->mode)) { |
| 389 | + strlcpy(p, fp->basename, remainder); |
| 390 | + look_for_rename(fp, fbuf, dirlist->file_pool); |
| 391 | + } |
| 392 | if (flist_find(flist, fp) < 0) { |
| 393 | f_name(fp, delbuf); |
| 394 | - delete_item(delbuf, fp->mode, DEL_FORCE_RECURSE); |
| 395 | - } |
| 396 | + delete_item(delbuf, fp->mode, flags); |
| 397 | + } else if (detect_renamed && S_ISDIR(fp->mode)) |
| 398 | + unexplored_dirs++; |
| 399 | } |
| 400 | |
| 401 | + fbuf[dlen] = '\0'; |
| 402 | + |
| 403 | flist_free(dirlist); |
| 404 | } |
| 405 | |
| 406 | @@ -312,9 +453,9 @@ static void do_delete_pass(struct file_l |
| 407 | || !S_ISDIR(st.st_mode)) |
| 408 | continue; |
| 409 | |
| 410 | - delete_in_dir(flist, fbuf, file, &st); |
| 411 | + delete_in_dir(flist, fbuf, file, &st, 0); |
| 412 | } |
| 413 | - delete_in_dir(NULL, NULL, NULL, NULL); |
| 414 | + delete_in_dir(NULL, NULL, NULL, NULL, 0); |
| 415 | |
| 416 | if (do_progress && !am_server) |
| 417 | rprintf(FINFO, " \r"); |
| 418 | @@ -753,6 +894,7 @@ static int try_dests_non(struct file_str |
| 419 | return -1; |
| 420 | } |
| 421 | |
| 422 | +static struct bitbag *delayed_bits = NULL; |
| 423 | static int phase = 0; |
| 424 | |
| 425 | /* Acts on the_file_list->file's ndx'th item, whose name is fname. If a dir, |
| 426 | @@ -894,8 +1036,12 @@ static void recv_generator(char *fname, |
| 427 | && verbose && code && f_out != -1) |
| 428 | rprintf(code, "%s/\n", fname); |
| 429 | if (delete_during && f_out != -1 && !phase && dry_run < 2 |
| 430 | - && (file->flags & FLAG_DEL_HERE)) |
| 431 | - delete_in_dir(the_file_list, fname, file, &st); |
| 432 | + && (file->flags & FLAG_DEL_HERE)) { |
| 433 | + if (detect_renamed && statret != 0) |
| 434 | + unexplored_dirs++; |
| 435 | + delete_in_dir(the_file_list, fname, file, &st, |
| 436 | + delete_during < 0 ? DEL_NO_DELETIONS : 0); |
| 437 | + } |
| 438 | return; |
| 439 | } |
| 440 | |
| 441 | @@ -1133,8 +1279,14 @@ static void recv_generator(char *fname, |
| 442 | && hard_link_check(file, ndx, fname, statret, &st, |
| 443 | itemizing, code, HL_SKIP)) |
| 444 | return; |
| 445 | - if (stat_errno == ENOENT) |
| 446 | + if (stat_errno == ENOENT) { |
| 447 | + if (detect_renamed && unexplored_dirs > 0 |
| 448 | + && file->length) { |
| 449 | + bitbag_set_bit(delayed_bits, ndx); |
| 450 | + return; |
| 451 | + } |
| 452 | goto notify_others; |
| 453 | + } |
| 454 | rsyserr(FERROR, stat_errno, "recv_generator: failed to stat %s", |
| 455 | full_fname(fname)); |
| 456 | return; |
| 457 | @@ -1309,11 +1461,17 @@ void generate_files(int f_out, struct fi |
| 458 | (long)getpid(), flist->count); |
| 459 | } |
| 460 | |
| 461 | + if (detect_renamed) { |
| 462 | + delayed_bits = bitbag_create(flist->count); |
| 463 | + if (!delete_before && !delete_during) |
| 464 | + delete_during = -1; |
| 465 | + } |
| 466 | + |
| 467 | if (delete_before && !local_name && flist->count > 0) |
| 468 | do_delete_pass(flist); |
| 469 | do_progress = 0; |
| 470 | |
| 471 | - if (append_mode || whole_file < 0) |
| 472 | + if (append_mode || detect_renamed || whole_file < 0) |
| 473 | whole_file = 0; |
| 474 | if (verbose >= 2) { |
| 475 | rprintf(FINFO, "delta-transmission %s\n", |
| 476 | @@ -1368,7 +1526,23 @@ void generate_files(int f_out, struct fi |
| 477 | } |
| 478 | recv_generator(NULL, NULL, 0, 0, 0, code, -1); |
| 479 | if (delete_during) |
| 480 | - delete_in_dir(NULL, NULL, NULL, NULL); |
| 481 | + delete_in_dir(NULL, NULL, NULL, NULL, 0); |
| 482 | + |
| 483 | + if (detect_renamed) { |
| 484 | + if (delete_during < 0) |
| 485 | + delete_during = 0; |
| 486 | + detect_renamed = 0; |
| 487 | + |
| 488 | + for (i = -1; (i = bitbag_next_bit(delayed_bits, i)) >= 0; ) { |
| 489 | + struct file_struct *file = flist->files[i]; |
| 490 | + if (local_name) |
| 491 | + strlcpy(fbuf, local_name, sizeof fbuf); |
| 492 | + else |
| 493 | + f_name(file, fbuf); |
| 494 | + recv_generator(fbuf, file, i, itemizing, |
| 495 | + maybe_ATTRS_REPORT, code, f_out); |
| 496 | + } |
| 497 | + } |
| 498 | |
| 499 | phase++; |
| 500 | csum_length = SUM_LENGTH; |
| 501 | --- old/options.c |
| 502 | +++ new/options.c |
| 503 | @@ -78,6 +78,7 @@ int am_starting_up = 1; |
| 504 | int orig_umask = 0; |
| 505 | int relative_paths = -1; |
| 506 | int implied_dirs = 1; |
| 507 | +int detect_renamed = 0; |
| 508 | int numeric_ids = 0; |
| 509 | int allow_8bit_chars = 0; |
| 510 | int force_delete = 0; |
| 511 | @@ -335,6 +336,7 @@ void usage(enum logcode F) |
| 512 | rprintf(F," --modify-window=NUM compare mod-times with reduced accuracy\n"); |
| 513 | rprintf(F," -T, --temp-dir=DIR create temporary files in directory DIR\n"); |
| 514 | rprintf(F," -y, --fuzzy find similar file for basis if no dest file\n"); |
| 515 | + rprintf(F," --detect-renamed try to find renamed files to speed up the transfer\n"); |
| 516 | rprintf(F," --compare-dest=DIR also compare destination files relative to DIR\n"); |
| 517 | rprintf(F," --copy-dest=DIR ... and include copies of unchanged files\n"); |
| 518 | rprintf(F," --link-dest=DIR hardlink to files in DIR when unchanged\n"); |
| 519 | @@ -480,6 +482,7 @@ static struct poptOption long_options[] |
| 520 | {"compare-dest", 0, POPT_ARG_STRING, 0, OPT_COMPARE_DEST, 0, 0 }, |
| 521 | {"copy-dest", 0, POPT_ARG_STRING, 0, OPT_COPY_DEST, 0, 0 }, |
| 522 | {"link-dest", 0, POPT_ARG_STRING, 0, OPT_LINK_DEST, 0, 0 }, |
| 523 | + {"detect-renamed", 0, POPT_ARG_NONE, &detect_renamed, 0, 0, 0 }, |
| 524 | {"fuzzy", 'y', POPT_ARG_NONE, &fuzzy_basis, 0, 0, 0 }, |
| 525 | {"compress", 'z', POPT_ARG_NONE, 0, 'z', 0, 0 }, |
| 526 | {"compress-level", 0, POPT_ARG_INT, &def_compress_level, 'z', 0, 0 }, |
| 527 | @@ -1334,7 +1337,7 @@ int parse_arguments(int *argc, const cha |
| 528 | inplace = 1; |
| 529 | } |
| 530 | |
| 531 | - if (delay_updates && !partial_dir) |
| 532 | + if ((delay_updates || detect_renamed) && !partial_dir) |
| 533 | partial_dir = tmp_partialdir; |
| 534 | |
| 535 | if (inplace) { |
| 536 | @@ -1343,6 +1346,7 @@ int parse_arguments(int *argc, const cha |
| 537 | snprintf(err_buf, sizeof err_buf, |
| 538 | "--%s cannot be used with --%s\n", |
| 539 | append_mode ? "append" : "inplace", |
| 540 | + detect_renamed ? "detect-renamed" : |
| 541 | delay_updates ? "delay-updates" : "partial-dir"); |
| 542 | return 0; |
| 543 | } |
| 544 | --- old/rsync.yo |
| 545 | +++ new/rsync.yo |
| 546 | @@ -358,6 +358,7 @@ to the detailed description below for a |
| 547 | --modify-window=NUM compare mod-times with reduced accuracy |
| 548 | -T, --temp-dir=DIR create temporary files in directory DIR |
| 549 | -y, --fuzzy find similar file for basis if no dest file |
| 550 | + --detect-renamed try to find renamed files to speed the xfer |
| 551 | --compare-dest=DIR also compare received files relative to DIR |
| 552 | --copy-dest=DIR ... and include copies of unchanged files |
| 553 | --link-dest=DIR hardlink to files in DIR when unchanged |
| 554 | @@ -1183,6 +1184,15 @@ Note that the use of the bf(--delete) op |
| 555 | fuzzy-match files, so either use bf(--delete-after) or specify some |
| 556 | filename exclusions if you need to prevent this. |
| 557 | |
| 558 | +dit(bf(--detect-renamed)) This option tells rsync to scan the receiving |
| 559 | +side for files that have been renamed, and to use any that are found as |
| 560 | +alternate basis files to help speed up the transfer. |
| 561 | +By default, alternate-basis files are hard-linked into a directory named |
| 562 | +".~tmp~" in each file's destination directory, but if you've specified |
| 563 | +the bf(--partial-dir) option, that directory will be used instead. These |
| 564 | +potential alternate-basis files will be removed as the transfer progresses. |
| 565 | +This option conflicts with bf(--inplace) and bf(--append). |
| 566 | + |
| 567 | dit(bf(--compare-dest=DIR)) This option instructs rsync to use em(DIR) on |
| 568 | the destination machine as an additional hierarchy to compare destination |
| 569 | files against doing transfers (if the files are missing in the destination |
| 570 | --- old/util.c |
| 571 | +++ new/util.c |
| 572 | @@ -997,6 +997,32 @@ int handle_partial_dir(const char *fname |
| 573 | return 1; |
| 574 | } |
| 575 | |
| 576 | +/* We need to supply our own strcmp function for file list comparisons |
| 577 | + * to ensure that signed/unsigned usage is consistent between machines. */ |
| 578 | +int u_strcmp(const char *p1, const char *p2) |
| 579 | +{ |
| 580 | + for ( ; *p1; p1++, p2++) { |
| 581 | + if (*p1 != *p2) |
| 582 | + break; |
| 583 | + } |
| 584 | + |
| 585 | + return (int)*(uchar*)p1 - (int)*(uchar*)p2; |
| 586 | +} |
| 587 | + |
| 588 | +/* We need a memcmp function compares unsigned-byte values. */ |
| 589 | +int u_memcmp(const void *p1, const void *p2, size_t len) |
| 590 | +{ |
| 591 | + const uchar *u1 = p1; |
| 592 | + const uchar *u2 = p2; |
| 593 | + |
| 594 | + while (len--) { |
| 595 | + if (*u1 != *u2) |
| 596 | + return (int)*u1 - (int)*u2; |
| 597 | + } |
| 598 | + |
| 599 | + return 0; |
| 600 | +} |
| 601 | + |
| 602 | /** |
| 603 | * Determine if a symlink points outside the current directory tree. |
| 604 | * This is considered "unsafe" because e.g. when mirroring somebody |