generator.c

   1 /* -*- c-file-style: "linux" -*-
   2
   3    rsync -- fast file replication program
   4
   5    Copyright (C) 1996-2000 by Andrew Tridgell
   6    Copyright (C) Paul Mackerras 1996
   7    Copyright (C) 2002 by Martin Pool <mbp@samba.org>
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "rsync.h"
  25
  26 extern int verbose;
  27 extern int dry_run;
  28 extern int relative_paths;
  29 extern int keep_dirlinks;
  30 extern int preserve_links;
  31 extern int am_root;
  32 extern int preserve_devices;
  33 extern int preserve_hard_links;
  34 extern int preserve_perms;
  35 extern int preserve_uid;
  36 extern int preserve_gid;
  37 extern int preserve_times;
  38 extern int omit_dir_times;
  39 extern int delete_during;
  40 extern int update_only;
  41 extern int opt_ignore_existing;
  42 extern int inplace;
  43 extern int make_backups;
  44 extern int csum_length;
  45 extern int ignore_times;
  46 extern int size_only;
  47 extern OFF_T max_size;
  48 extern int io_timeout;
  49 extern int protocol_version;
  50 extern int fuzzy_basis;
  51 extern int always_checksum;
  52 extern char *partial_dir;
  53 extern char *basis_dir[];
  54 extern int compare_dest;
  55 extern int link_dest;
  56 extern int whole_file;
  57 extern int local_server;
  58 extern int list_only;
  59 extern int read_batch;
  60 extern int only_existing;
  61 extern int orig_umask;
  62 extern int safe_symlinks;
  63 extern long block_size; /* "long" because popt can't set an int32. */
  64
  65 extern struct filter_list_struct server_filter_list;
  66
  67 static int unchanged_attrs(struct file_struct *file, STRUCT_STAT *st)
  68 {
  69         if (preserve_perms
  70          && (st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS))
  71                 return 0;
  72
  73         if (am_root && preserve_uid && st->st_uid != file->uid)
  74                 return 0;
  75
  76         if (preserve_gid && file->gid != GID_NONE && st->st_gid != file->gid)
  77                 return 0;
  78
  79         return 1;
  80 }
  81
  82 /* Perform our quick-check heuristic for determining if a file is unchanged. */
  83 static int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
  84 {
  85         if (st->st_size != file->length)
  86                 return 0;
  87
  88         /* if always checksum is set then we use the checksum instead
  89            of the file time to determine whether to sync */
  90         if (always_checksum && S_ISREG(st->st_mode)) {
  91                 char sum[MD4_SUM_LENGTH];
  92                 file_checksum(fn, sum, st->st_size);
  93                 return memcmp(sum, file->u.sum, protocol_version < 21 ? 2
  94                                                         : MD4_SUM_LENGTH) == 0;
  95         }
  96
  97         if (size_only)
  98                 return 1;
  99
 100         if (ignore_times)
 101                 return 0;
 102
 103         return cmp_modtime(st->st_mtime, file->modtime) == 0;
 104 }
 105
 106
 107 /*
 108  * set (initialize) the size entries in the per-file sum_struct
 109  * calculating dynamic block and checksum sizes.
 110  *
 111  * This is only called from generate_and_send_sums() but is a separate
 112  * function to encapsulate the logic.
 113  *
 114  * The block size is a rounded square root of file length.
 115  *
 116  * The checksum size is determined according to:
 117  *     blocksum_bits = BLOCKSUM_EXP + 2*log2(file_len) - log2(block_len)
 118  * provided by Donovan Baarda which gives a probability of rsync
 119  * algorithm corrupting data and falling back using the whole md4
 120  * checksums.
 121  *
 122  * This might be made one of several selectable heuristics.
 123  */
 124 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 125 {
 126         int32 blength;
 127         int s2length;
 128
 129         if (block_size)
 130                 blength = block_size;
 131         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 132                 blength = BLOCK_SIZE;
 133         else {
 134                 int32 c;
 135                 int64 l;
 136                 int cnt;
 137                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 138                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 139                         blength = MAX_BLOCK_SIZE;
 140                 else {
 141                     blength = 0;
 142                     do {
 143                             blength |= c;
 144                             if (len < (int64)blength * blength)
 145                                     blength &= ~c;
 146                             c >>= 1;
 147                     } while (c >= 8);   /* round to multiple of 8 */
 148                     blength = MAX(blength, BLOCK_SIZE);
 149                 }
 150         }
 151
 152         if (protocol_version < 27) {
 153                 s2length = csum_length;
 154         } else if (csum_length == SUM_LENGTH) {
 155                 s2length = SUM_LENGTH;
 156         } else {
 157                 int32 c;
 158                 int64 l;
 159                 int b = BLOCKSUM_BIAS;
 160                 for (l = len; l >>= 1; b += 2) {}
 161                 for (c = blength; c >>= 1 && b; b--) {}
 162                 /* add a bit, subtract rollsum, round up. */
 163                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 164                 s2length = MAX(s2length, csum_length);
 165                 s2length = MIN(s2length, SUM_LENGTH);
 166         }
 167
 168         sum->flength    = len;
 169         sum->blength    = blength;
 170         sum->s2length   = s2length;
 171         sum->count      = (len + (blength - 1)) / blength;
 172         sum->remainder  = (len % blength);
 173
 174         if (sum->count && verbose > 2) {
 175                 rprintf(FINFO,
 176                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 177                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 178                         sum->s2length, (double)sum->flength);
 179         }
 180 }
 181
 182
 183 /*
 184  * Generate and send a stream of signatures/checksums that describe a buffer
 185  *
 186  * Generate approximately one checksum every block_len bytes.
 187  */
 188 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 189 {
 190         int32 i;
 191         struct map_struct *mapbuf;
 192         struct sum_struct sum;
 193         OFF_T offset = 0;
 194
 195         sum_sizes_sqroot(&sum, len);
 196
 197         if (len > 0)
 198                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 199         else
 200                 mapbuf = NULL;
 201
 202         write_sum_head(f_out, &sum);
 203
 204         for (i = 0; i < sum.count; i++) {
 205                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 206                 char *map = map_ptr(mapbuf, offset, n1);
 207                 uint32 sum1 = get_checksum1(map, n1);
 208                 char sum2[SUM_LENGTH];
 209
 210                 if (f_copy >= 0)
 211                         full_write(f_copy, map, n1);
 212
 213                 get_checksum2(map, n1, sum2);
 214
 215                 if (verbose > 3) {
 216                         rprintf(FINFO,
 217                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 218                                 (double)i, (double)offset, (long)n1,
 219                                 (unsigned long)sum1);
 220                 }
 221                 write_int(f_out, sum1);
 222                 write_buf(f_out, sum2, sum.s2length);
 223                 len -= n1;
 224                 offset += n1;
 225         }
 226
 227         if (mapbuf)
 228                 unmap_file(mapbuf);
 229 }
 230
 231 /* Try to find a filename in the same dir as "fname" with a similar name. */
 232 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 233 {
 234         int fname_len, fname_suf_len;
 235         const char *fname_suf, *fname = file->basename;
 236         uint32 lowest_dist = 0x7FFFFFFF;
 237         int j, lowest_j = -1;
 238
 239         fname_len = strlen(fname);
 240         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 241
 242         for (j = 0; j < dirlist->count; j++) {
 243                 struct file_struct *fp = dirlist->files[j];
 244                 const char *suf, *name;
 245                 int len, suf_len;
 246                 uint32 dist;
 247
 248                 if (!S_ISREG(fp->mode) || !fp->length
 249                     || fp->flags & FLAG_NO_FUZZY)
 250                         continue;
 251
 252                 name = fp->basename;
 253
 254                 if (fp->length == file->length
 255                     && fp->modtime == file->modtime) {
 256                         if (verbose > 4) {
 257                                 rprintf(FINFO,
 258                                         "fuzzy size/modtime match for %s\n",
 259                                         name);
 260                         }
 261                         return j;
 262                 }
 263
 264                 len = strlen(name);
 265                 suf = find_filename_suffix(name, len, &suf_len);
 266
 267                 dist = fuzzy_distance(name, len, fname, fname_len);
 268                 /* Add some extra weight to how well the suffixes match. */
 269                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 270                       * 10;
 271                 if (verbose > 4) {
 272                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 273                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 274                 }
 275                 if (dist <= lowest_dist) {
 276                         lowest_dist = dist;
 277                         lowest_j = j;
 278                 }
 279         }
 280
 281         return lowest_j;
 282 }
 283
 284
 285 /* Acts on flist->file's ndx'th item, whose name is fname.  If a directory,
 286  * make sure it exists, and has the right permissions/timestamp info.  For
 287  * all other non-regular files (symlinks, etc.) we create them here.  For
 288  * regular files that have changed, we try to find a basis file and then
 289  * start sending checksums.
 290  *
 291  * Note that f_out is set to -1 when doing final directory-permission and
 292  * modification-time repair. */
 293 static void recv_generator(char *fname, struct file_list *flist,
 294                            struct file_struct *file, int ndx,
 295                            int f_out, int f_out_name)
 296 {
 297         static int missing_below = -1;
 298         static char *fuzzy_dirname = NULL;
 299         static struct file_list *fuzzy_dirlist = NULL;
 300         struct file_struct *fuzzy_file = NULL;
 301         int fd = -1, f_copy = -1;
 302         STRUCT_STAT st, partial_st;
 303         struct file_struct *back_file = NULL;
 304         int statret, stat_errno;
 305         char *fnamecmp, *partialptr, *backupptr = NULL;
 306         char fnamecmpbuf[MAXPATHLEN];
 307         uchar fnamecmp_type;
 308
 309         if (list_only)
 310                 return;
 311
 312         if (!fname) {
 313                 if (fuzzy_dirlist) {
 314                         flist_free(fuzzy_dirlist);
 315                         fuzzy_dirlist = NULL;
 316                         fuzzy_dirname = NULL;
 317                 }
 318                 if (missing_below >= 0) {
 319                         dry_run--;
 320                         missing_below = -1;
 321                 }
 322                 return;
 323         }
 324
 325         if (verbose > 2) {
 326                 rprintf(FINFO, "recv_generator(%s,%d)\n",
 327                         safe_fname(fname), ndx);
 328         }
 329
 330         if (server_filter_list.head
 331             && check_filter(&server_filter_list, fname,
 332                             S_ISDIR(file->mode)) < 0) {
 333                 if (verbose) {
 334                         rprintf(FINFO, "skipping server-excluded file \"%s\"\n",
 335                                 safe_fname(fname));
 336                 }
 337                 return;
 338         }
 339
 340         if (missing_below >= 0 && file->dir.depth <= missing_below) {
 341                 dry_run--;
 342                 missing_below = -1;
 343         }
 344         if (dry_run > 1) {
 345                 statret = -1;
 346                 stat_errno = ENOENT;
 347         } else {
 348                 if (fuzzy_basis && S_ISREG(file->mode)) {
 349                         char *dn = file->dirname ? file->dirname : ".";
 350                         /* Yes, identical dirnames are guaranteed to have
 351                          * identical pointers at this point. */
 352                         if (fuzzy_dirname != dn) {
 353                                 if (fuzzy_dirlist)
 354                                         flist_free(fuzzy_dirlist);
 355                                 fuzzy_dirname = dn;
 356                                 fuzzy_dirlist = get_dirlist(fuzzy_dirname, 1);
 357                         }
 358                 }
 359
 360                 statret = link_stat(fname, &st,
 361                                     keep_dirlinks && S_ISDIR(file->mode));
 362                 stat_errno = errno;
 363         }
 364
 365         if (only_existing && statret == -1 && stat_errno == ENOENT) {
 366                 /* we only want to update existing files */
 367                 if (verbose > 1) {
 368                         rprintf(FINFO, "not creating new file \"%s\"\n",
 369                                 safe_fname(fname));
 370                 }
 371                 return;
 372         }
 373
 374         if (statret == 0 && !preserve_perms
 375             && S_ISDIR(st.st_mode) == S_ISDIR(file->mode)) {
 376                 /* if the file exists already and we aren't perserving
 377                  * permissions then act as though the remote end sent
 378                  * us the file permissions we already have */
 379                 file->mode = (file->mode & ~CHMOD_BITS)
 380                            | (st.st_mode & CHMOD_BITS);
 381         }
 382
 383         if (S_ISDIR(file->mode)) {
 384                 /* The file to be received is a directory, so we need
 385                  * to prepare appropriately.  If there is already a
 386                  * file of that name and it is *not* a directory, then
 387                  * we need to delete it.  If it doesn't exist, then
 388                  * (perhaps recursively) create it. */
 389                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
 390                         delete_file(fname, DEL_TERSE);
 391                         statret = -1;
 392                 }
 393                 if (dry_run && statret != 0 && missing_below < 0) {
 394                         missing_below = file->dir.depth;
 395                         dry_run++;
 396                 }
 397                 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
 398                         if (!relative_paths || errno != ENOENT
 399                             || create_directory_path(fname, orig_umask) < 0
 400                             || do_mkdir(fname, file->mode) < 0) {
 401                                 rsyserr(FERROR, errno,
 402                                         "recv_generator: mkdir %s failed",
 403                                         full_fname(fname));
 404                         }
 405                 }
 406                 if (set_perms(fname, file, statret ? NULL : &st, 0)
 407                     && verbose && f_out != -1)
 408                         rprintf(FINFO, "%s/\n", safe_fname(fname));
 409                 if (delete_during && f_out != -1 && csum_length != SUM_LENGTH
 410                     && (file->flags & FLAG_DEL_HERE))
 411                         delete_in_dir(flist, fname, file);
 412                 return;
 413         } else if (max_size && file->length > max_size) {
 414                 if (verbose > 1) {
 415                         rprintf(FINFO, "%s is over max-size\n",
 416                                 safe_fname(fname));
 417                 }
 418                 return;
 419         }
 420
 421         if (preserve_links && S_ISLNK(file->mode)) {
 422 #ifdef SUPPORT_LINKS
 423                 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
 424                         if (verbose) {
 425                                 rprintf(FINFO,
 426                                         "ignoring unsafe symlink %s -> \"%s\"\n",
 427                                         full_fname(fname),
 428                                         safe_fname(file->u.link));
 429                         }
 430                         return;
 431                 }
 432                 if (statret == 0) {
 433                         int dflag = S_ISDIR(st.st_mode) ? DEL_DIR : 0;
 434                         char lnk[MAXPATHLEN];
 435                         int len;
 436
 437                         if (!dflag
 438                             && (len = readlink(fname, lnk, MAXPATHLEN-1)) > 0) {
 439                                 lnk[len] = 0;
 440                                 /* A link already pointing to the
 441                                  * right place -- no further action
 442                                  * required. */
 443                                 if (strcmp(lnk, file->u.link) == 0) {
 444                                         set_perms(fname, file, &st,
 445                                                   PERMS_REPORT);
 446                                         return;
 447                                 }
 448                         }
 449                         /* Not the right symlink (or not a symlink), so
 450                          * delete it. */
 451                         delete_file(fname, dflag | DEL_TERSE);
 452                 }
 453                 if (do_symlink(file->u.link,fname) != 0) {
 454                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
 455                                 full_fname(fname), safe_fname(file->u.link));
 456                 } else {
 457                         set_perms(fname,file,NULL,0);
 458                         if (verbose) {
 459                                 rprintf(FINFO, "%s -> %s\n", safe_fname(fname),
 460                                         safe_fname(file->u.link));
 461                         }
 462                 }
 463 #endif
 464                 return;
 465         }
 466
 467         if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
 468                 if (statret != 0 ||
 469                     st.st_mode != file->mode ||
 470                     st.st_rdev != file->u.rdev) {
 471                         int dflag = S_ISDIR(st.st_mode) ? DEL_DIR : 0;
 472                         delete_file(fname, dflag | DEL_TERSE);
 473                         if (verbose > 2) {
 474                                 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
 475                                         safe_fname(fname),
 476                                         (int)file->mode, (int)file->u.rdev);
 477                         }
 478                         if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
 479                                 rsyserr(FERROR, errno, "mknod %s failed",
 480                                         full_fname(fname));
 481                         } else {
 482                                 set_perms(fname,file,NULL,0);
 483                                 if (verbose) {
 484                                         rprintf(FINFO, "%s\n",
 485                                                 safe_fname(fname));
 486                                 }
 487                         }
 488                 } else {
 489                         set_perms(fname, file, &st, PERMS_REPORT);
 490                 }
 491                 return;
 492         }
 493
 494         if (preserve_hard_links && hard_link_check(file, HL_CHECK_MASTER))
 495                 return;
 496
 497         if (!S_ISREG(file->mode)) {
 498                 rprintf(FINFO, "skipping non-regular file \"%s\"\n",
 499                         safe_fname(fname));
 500                 return;
 501         }
 502
 503         fnamecmp = fname;
 504         fnamecmp_type = FNAMECMP_FNAME;
 505
 506         if (statret == -1 && basis_dir[0] != NULL) {
 507                 int fallback_match = -1;
 508                 int match_level = 0;
 509                 int i = 0;
 510                 do {
 511                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 512                                  basis_dir[i], fname);
 513                         if (link_stat(fnamecmpbuf, &st, 0) == 0
 514                             && S_ISREG(st.st_mode)) {
 515                                 statret = 0;
 516                                 if (link_dest) {
 517                                         if (!match_level) {
 518                                                 fallback_match = i;
 519                                                 match_level = 1;
 520                                         } else if (match_level == 2
 521                                             && !unchanged_attrs(file, &st))
 522                                                 continue;
 523                                         if (!unchanged_file(fnamecmpbuf, file, &st))
 524                                                 continue;
 525                                         fallback_match = i;
 526                                         match_level = 2;
 527                                         if (!unchanged_attrs(file, &st))
 528                                                 continue;
 529                                 }
 530                                 match_level = 3;
 531                                 break;
 532                         }
 533                 } while (basis_dir[++i] != NULL);
 534                 if (statret == 0) {
 535                         if (match_level < 3) {
 536                                 i = fallback_match;
 537                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 538                                          basis_dir[i], fname);
 539                         }
 540 #ifdef HAVE_LINK
 541                         if (link_dest && match_level == 3 && !dry_run) {
 542                                 if (do_link(fnamecmpbuf, fname) < 0) {
 543                                         if (verbose) {
 544                                                 rsyserr(FINFO, errno,
 545                                                         "link %s => %s",
 546                                                         full_fname(fnamecmpbuf),
 547                                                         safe_fname(fname));
 548                                         }
 549                                         fnamecmp = fnamecmpbuf;
 550                                         fnamecmp_type = i;
 551                                 }
 552                         } else
 553 #endif
 554                         {
 555                                 fnamecmp = fnamecmpbuf;
 556                                 fnamecmp_type = i;
 557                         }
 558                 }
 559         }
 560
 561         if (statret == 0 && !S_ISREG(st.st_mode)) {
 562                 int dflag = S_ISDIR(st.st_mode) ? DEL_DIR : 0;
 563                 if (delete_file(fname, dflag | DEL_TERSE) != 0)
 564                         return;
 565                 statret = -1;
 566                 stat_errno = ENOENT;
 567         }
 568
 569         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
 570             && link_stat(partialptr, &partial_st, 0) == 0
 571             && S_ISREG(partial_st.st_mode)) {
 572                 if (statret == -1)
 573                         goto prepare_to_open;
 574         } else
 575                 partialptr = NULL;
 576
 577         if (statret == -1 && fuzzy_basis && dry_run <= 1) {
 578                 int j = find_fuzzy(file, fuzzy_dirlist);
 579                 if (j >= 0) {
 580                         fuzzy_file = fuzzy_dirlist->files[j];
 581                         f_name_to(fuzzy_file, fnamecmpbuf);
 582                         if (verbose > 2) {
 583                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
 584                                         safe_fname(fname), safe_fname(fnamecmpbuf));
 585                         }
 586                         st.st_mode = fuzzy_file->mode;
 587                         st.st_size = fuzzy_file->length;
 588                         st.st_mtime = fuzzy_file->modtime;
 589                         statret = 0;
 590                         fnamecmp = fnamecmpbuf;
 591                         fnamecmp_type = FNAMECMP_FUZZY;
 592                 }
 593         }
 594
 595         if (statret == -1) {
 596                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 597                         return;
 598                 if (stat_errno == ENOENT)
 599                         goto notify_others;
 600                 if (verbose > 1) {
 601                         rsyserr(FERROR, stat_errno,
 602                                 "recv_generator: failed to stat %s",
 603                                 full_fname(fname));
 604                 }
 605                 return;
 606         }
 607
 608         if (opt_ignore_existing && fnamecmp_type == FNAMECMP_FNAME) {
 609                 if (verbose > 1)
 610                         rprintf(FINFO, "%s exists\n", safe_fname(fname));
 611                 return;
 612         }
 613
 614         if (update_only && fnamecmp_type == FNAMECMP_FNAME
 615             && cmp_modtime(st.st_mtime, file->modtime) > 0) {
 616                 if (verbose > 1)
 617                         rprintf(FINFO, "%s is newer\n", safe_fname(fname));
 618                 return;
 619         }
 620
 621         if (!compare_dest && fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
 622                 ;
 623         else if (fnamecmp_type == FNAMECMP_FUZZY)
 624                 ;
 625         else if (unchanged_file(fnamecmp, file, &st)) {
 626                 if (fnamecmp_type == FNAMECMP_FNAME)
 627                         set_perms(fname, file, &st, PERMS_REPORT);
 628                 return;
 629         }
 630
 631 prepare_to_open:
 632         if (partialptr) {
 633                 st = partial_st;
 634                 fnamecmp = partialptr;
 635                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
 636                 statret = 0;
 637         }
 638
 639         if (dry_run || read_batch)
 640                 goto notify_others;
 641         if (whole_file > 0) {
 642                 statret = -1;
 643                 goto notify_others;
 644         }
 645
 646         if (fuzzy_basis) {
 647                 int j = flist_find(fuzzy_dirlist, file);
 648                 if (j >= 0) /* don't use changing file as future fuzzy basis */
 649                         fuzzy_dirlist->files[j]->flags |= FLAG_NO_FUZZY;
 650         }
 651
 652         /* open the file */
 653         fd = do_open(fnamecmp, O_RDONLY, 0);
 654
 655         if (fd == -1) {
 656                 rsyserr(FERROR, errno, "failed to open %s, continuing",
 657                         full_fname(fnamecmp));
 658             pretend_missing:
 659                 /* pretend the file didn't exist */
 660                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 661                         return;
 662                 statret = -1;
 663                 goto notify_others;
 664         }
 665
 666         if (inplace && make_backups) {
 667                 if (!(backupptr = get_backup_name(fname))) {
 668                         close(fd);
 669                         return;
 670                 }
 671                 if (!(back_file = make_file(fname, NULL, NO_FILTERS))) {
 672                         close(fd);
 673                         goto pretend_missing;
 674                 }
 675                 if (robust_unlink(backupptr) && errno != ENOENT) {
 676                         rsyserr(FERROR, errno, "unlink %s",
 677                                 full_fname(backupptr));
 678                         free(back_file);
 679                         close(fd);
 680                         return;
 681                 }
 682                 if ((f_copy = do_open(backupptr,
 683                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
 684                         rsyserr(FERROR, errno, "open %s",
 685                                 full_fname(backupptr));
 686                         free(back_file);
 687                         close(fd);
 688                         return;
 689                 }
 690                 fnamecmp_type = FNAMECMP_BACKUP;
 691         }
 692
 693         if (verbose > 3) {
 694                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
 695                         safe_fname(fnamecmp), (double)st.st_size);
 696         }
 697
 698         if (verbose > 2)
 699                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
 700
 701 notify_others:
 702         write_int(f_out, ndx);
 703         if (protocol_version >= 29 && inplace && !read_batch)
 704                 write_byte(f_out, fnamecmp_type);
 705         if (f_out_name >= 0) {
 706                 write_byte(f_out_name, fnamecmp_type);
 707                 if (fnamecmp_type == FNAMECMP_FUZZY) {
 708                         uchar lenbuf[3], *lb = lenbuf;
 709                         int len = strlen(fuzzy_file->basename);
 710                         if (len > 0x7F) {
 711 #if MAXPATHLEN > 0x7FFF
 712                                 *lb++ = len / 0x10000 + 0x80;
 713                                 *lb++ = len / 0x100;
 714 #else
 715                                 *lb++ = len / 0x100 + 0x80;
 716 #endif
 717                         }
 718                         *lb = len;
 719                         write_buf(f_out_name, lenbuf, lb - lenbuf + 1);
 720                         write_buf(f_out_name, fuzzy_file->basename, len);
 721                 }
 722         }
 723
 724         if (dry_run || read_batch)
 725                 return;
 726
 727         if (statret == 0) {
 728                 generate_and_send_sums(fd, st.st_size, f_out, f_copy);
 729
 730                 if (f_copy >= 0) {
 731                         close(f_copy);
 732                         set_perms(backupptr, back_file, NULL, 0);
 733                         if (verbose > 1) {
 734                                 rprintf(FINFO, "backed up %s to %s\n",
 735                                         safe_fname(fname), safe_fname(backupptr));
 736                         }
 737                         free(back_file);
 738                 }
 739
 740                 close(fd);
 741         } else
 742                 write_sum_head(f_out, NULL);
 743 }
 744
 745
 746 void generate_files(int f_out, struct file_list *flist, char *local_name,
 747                     int f_out_name)
 748 {
 749         int i;
 750         int phase = 0;
 751         char fbuf[MAXPATHLEN];
 752         int need_retouch_dir_times = preserve_times && !omit_dir_times;
 753         int need_retouch_dir_perms = 0;
 754         int save_only_existing = only_existing;
 755         int save_opt_ignore_existing = opt_ignore_existing;
 756
 757         if (verbose > 2) {
 758                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
 759                         (long)getpid(), flist->count);
 760         }
 761
 762         if (verbose >= 2) {
 763                 rprintf(FINFO,
 764                         whole_file > 0
 765                         ? "delta-transmission disabled for local transfer or --whole-file\n"
 766                         : "delta transmission enabled\n");
 767         }
 768
 769         /* We expect to just sit around now, so don't exit on a timeout.
 770          * If we really get a timeout then the other process should exit. */
 771         io_timeout = 0;
 772
 773         for (i = 0; i < flist->count; i++) {
 774                 struct file_struct *file = flist->files[i];
 775                 struct file_struct copy;
 776
 777                 if (!file->basename)
 778                         continue;
 779
 780                 /* We need to ensure that any dirs we create have writeable
 781                  * permissions during the time we are putting files within
 782                  * them.  This is then fixed after the transfer is done. */
 783                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)) {
 784                         copy = *file;
 785                         copy.mode |= S_IWUSR; /* user write */
 786                         file = &copy;
 787                         need_retouch_dir_perms = 1;
 788                 }
 789
 790                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
 791                                flist, file, i, f_out, f_out_name);
 792         }
 793         recv_generator(NULL, NULL, NULL, 0, -1, -1);
 794         if (delete_during)
 795                 delete_in_dir(NULL, NULL, NULL);
 796
 797         phase++;
 798         csum_length = SUM_LENGTH;
 799         only_existing = max_size = opt_ignore_existing = 0;
 800         update_only = always_checksum = size_only = 0;
 801         ignore_times = 1;
 802
 803         if (verbose > 2)
 804                 rprintf(FINFO,"generate_files phase=%d\n",phase);
 805
 806         write_int(f_out, -1);
 807
 808         /* files can cycle through the system more than once
 809          * to catch initial checksum errors */
 810         while ((i = get_redo_num()) != -1) {
 811                 struct file_struct *file = flist->files[i];
 812                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
 813                                flist, file, i, f_out, f_out_name);
 814         }
 815
 816         phase++;
 817         only_existing = save_only_existing;
 818         opt_ignore_existing = save_opt_ignore_existing;
 819
 820         if (verbose > 2)
 821                 rprintf(FINFO,"generate_files phase=%d\n",phase);
 822
 823         write_int(f_out, -1);
 824
 825         /* Read post-redo-phase MSG_DONE and any prior messages. */
 826         get_redo_num();
 827
 828         if (preserve_hard_links)
 829                 do_hard_links();
 830
 831         if ((need_retouch_dir_perms || need_retouch_dir_times)
 832             && !list_only && !local_name && !dry_run) {
 833                 /* Now we need to fix any directory permissions that were
 834                  * modified during the transfer and/or re-set any tweaked
 835                  * modified-time values. */
 836                 for (i = 0; i < flist->count; i++) {
 837                         struct file_struct *file = flist->files[i];
 838                         if (!file->basename || !S_ISDIR(file->mode))
 839                                 continue;
 840                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
 841                                 continue;
 842                         recv_generator(local_name ? local_name : f_name(file),
 843                                        flist, file, i, -1, -1);
 844                 }
 845         }
 846         recv_generator(NULL, NULL, NULL, 0, -1, -1);
 847
 848         if (verbose > 2)
 849                 rprintf(FINFO,"generate_files finished\n");
 850 }