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