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 itemize_changes;
  29 extern int relative_paths;
  30 extern int keep_dirlinks;
  31 extern int preserve_links;
  32 extern int am_root;
  33 extern int preserve_devices;
  34 extern int preserve_hard_links;
  35 extern int preserve_perms;
  36 extern int preserve_uid;
  37 extern int preserve_gid;
  38 extern int preserve_times;
  39 extern int omit_dir_times;
  40 extern int delete_during;
  41 extern int update_only;
  42 extern int opt_ignore_existing;
  43 extern int inplace;
  44 extern int make_backups;
  45 extern int csum_length;
  46 extern int ignore_times;
  47 extern int size_only;
  48 extern OFF_T max_size;
  49 extern int io_timeout;
  50 extern int protocol_version;
  51 extern int fuzzy_basis;
  52 extern int always_checksum;
  53 extern char *partial_dir;
  54 extern char *basis_dir[];
  55 extern int compare_dest;
  56 extern int link_dest;
  57 extern int whole_file;
  58 extern int local_server;
  59 extern int list_only;
  60 extern int read_batch;
  61 extern int only_existing;
  62 extern int orig_umask;
  63 extern int safe_symlinks;
  64 extern long block_size; /* "long" because popt can't set an int32. */
  65
  66 extern struct filter_list_struct server_filter_list;
  67
  68 static int unchanged_attrs(struct file_struct *file, STRUCT_STAT *st)
  69 {
  70         if (preserve_perms
  71          && (st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS))
  72                 return 0;
  73
  74         if (am_root && preserve_uid && st->st_uid != file->uid)
  75                 return 0;
  76
  77         if (preserve_gid && file->gid != GID_NONE && st->st_gid != file->gid)
  78                 return 0;
  79
  80         return 1;
  81 }
  82
  83
  84 #define SID_UPDATING              ITEM_UPDATING
  85 #define SID_REPORT_CHECKSUM       ITEM_REPORT_CHECKSUM
  86 #define SID_NO_DEST_AND_NO_UPDATE (1<<16)
  87
  88 static void itemize(struct file_struct *file, int statret, STRUCT_STAT *st,
  89                     int32 sflags, int f_out, int ndx)
  90 {
  91         int iflags = sflags & (SID_UPDATING | SID_REPORT_CHECKSUM);
  92
  93         if (statret >= 0) {
  94                 if (S_ISREG(file->mode) && file->length != st->st_size)
  95                         iflags |= ITEM_REPORT_SIZE;
  96                 if (!(sflags & SID_NO_DEST_AND_NO_UPDATE)) {
  97                         int keep_time = !preserve_times ? 0
  98                             : S_ISDIR(file->mode) ? !omit_dir_times
  99                             : !S_ISLNK(file->mode);
 100
 101                         if ((iflags & ITEM_UPDATING && !keep_time)
 102                             || (keep_time && file->modtime != st->st_mtime))
 103                                 iflags |= ITEM_REPORT_TIME;
 104                         if (preserve_perms && file->mode != st->st_mode)
 105                                 iflags |= ITEM_REPORT_PERMS;
 106                         if (preserve_uid && am_root && file->uid != st->st_uid)
 107                                 iflags |= ITEM_REPORT_OWNER;
 108                         if (preserve_gid && file->gid != GID_NONE
 109                             && st->st_gid != file->gid)
 110                                 iflags |= ITEM_REPORT_GROUP;
 111                 }
 112         } else
 113                 iflags |= ITEM_IS_NEW | ITEM_UPDATING;
 114
 115         if ((iflags || verbose > 1) && !read_batch) {
 116                 if (ndx >= 0)
 117                         write_int(f_out, ndx);
 118                 write_shortint(f_out, iflags);
 119         }
 120 }
 121
 122
 123 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 124 static int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 125 {
 126         if (st->st_size != file->length)
 127                 return 0;
 128
 129         /* if always checksum is set then we use the checksum instead
 130            of the file time to determine whether to sync */
 131         if (always_checksum && S_ISREG(st->st_mode)) {
 132                 char sum[MD4_SUM_LENGTH];
 133                 file_checksum(fn, sum, st->st_size);
 134                 return memcmp(sum, file->u.sum, protocol_version < 21 ? 2
 135                                                         : MD4_SUM_LENGTH) == 0;
 136         }
 137
 138         if (size_only)
 139                 return 1;
 140
 141         if (ignore_times)
 142                 return 0;
 143
 144         return cmp_modtime(st->st_mtime, file->modtime) == 0;
 145 }
 146
 147
 148 /*
 149  * set (initialize) the size entries in the per-file sum_struct
 150  * calculating dynamic block and checksum sizes.
 151  *
 152  * This is only called from generate_and_send_sums() but is a separate
 153  * function to encapsulate the logic.
 154  *
 155  * The block size is a rounded square root of file length.
 156  *
 157  * The checksum size is determined according to:
 158  *     blocksum_bits = BLOCKSUM_EXP + 2*log2(file_len) - log2(block_len)
 159  * provided by Donovan Baarda which gives a probability of rsync
 160  * algorithm corrupting data and falling back using the whole md4
 161  * checksums.
 162  *
 163  * This might be made one of several selectable heuristics.
 164  */
 165 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 166 {
 167         int32 blength;
 168         int s2length;
 169
 170         if (block_size)
 171                 blength = block_size;
 172         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 173                 blength = BLOCK_SIZE;
 174         else {
 175                 int32 c;
 176                 int64 l;
 177                 int cnt;
 178                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 179                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 180                         blength = MAX_BLOCK_SIZE;
 181                 else {
 182                     blength = 0;
 183                     do {
 184                             blength |= c;
 185                             if (len < (int64)blength * blength)
 186                                     blength &= ~c;
 187                             c >>= 1;
 188                     } while (c >= 8);   /* round to multiple of 8 */
 189                     blength = MAX(blength, BLOCK_SIZE);
 190                 }
 191         }
 192
 193         if (protocol_version < 27) {
 194                 s2length = csum_length;
 195         } else if (csum_length == SUM_LENGTH) {
 196                 s2length = SUM_LENGTH;
 197         } else {
 198                 int32 c;
 199                 int64 l;
 200                 int b = BLOCKSUM_BIAS;
 201                 for (l = len; l >>= 1; b += 2) {}
 202                 for (c = blength; c >>= 1 && b; b--) {}
 203                 /* add a bit, subtract rollsum, round up. */
 204                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 205                 s2length = MAX(s2length, csum_length);
 206                 s2length = MIN(s2length, SUM_LENGTH);
 207         }
 208
 209         sum->flength    = len;
 210         sum->blength    = blength;
 211         sum->s2length   = s2length;
 212         sum->count      = (len + (blength - 1)) / blength;
 213         sum->remainder  = (len % blength);
 214
 215         if (sum->count && verbose > 2) {
 216                 rprintf(FINFO,
 217                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 218                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 219                         sum->s2length, (double)sum->flength);
 220         }
 221 }
 222
 223
 224 /*
 225  * Generate and send a stream of signatures/checksums that describe a buffer
 226  *
 227  * Generate approximately one checksum every block_len bytes.
 228  */
 229 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 230 {
 231         int32 i;
 232         struct map_struct *mapbuf;
 233         struct sum_struct sum;
 234         OFF_T offset = 0;
 235
 236         sum_sizes_sqroot(&sum, len);
 237
 238         if (len > 0)
 239                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 240         else
 241                 mapbuf = NULL;
 242
 243         write_sum_head(f_out, &sum);
 244
 245         for (i = 0; i < sum.count; i++) {
 246                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 247                 char *map = map_ptr(mapbuf, offset, n1);
 248                 uint32 sum1 = get_checksum1(map, n1);
 249                 char sum2[SUM_LENGTH];
 250
 251                 if (f_copy >= 0)
 252                         full_write(f_copy, map, n1);
 253
 254                 get_checksum2(map, n1, sum2);
 255
 256                 if (verbose > 3) {
 257                         rprintf(FINFO,
 258                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 259                                 (double)i, (double)offset, (long)n1,
 260                                 (unsigned long)sum1);
 261                 }
 262                 write_int(f_out, sum1);
 263                 write_buf(f_out, sum2, sum.s2length);
 264                 len -= n1;
 265                 offset += n1;
 266         }
 267
 268         if (mapbuf)
 269                 unmap_file(mapbuf);
 270 }
 271
 272
 273 /* Try to find a filename in the same dir as "fname" with a similar name. */
 274 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 275 {
 276         int fname_len, fname_suf_len;
 277         const char *fname_suf, *fname = file->basename;
 278         uint32 lowest_dist = 0x7FFFFFFF;
 279         int j, lowest_j = -1;
 280
 281         fname_len = strlen(fname);
 282         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 283
 284         for (j = 0; j < dirlist->count; j++) {
 285                 struct file_struct *fp = dirlist->files[j];
 286                 const char *suf, *name;
 287                 int len, suf_len;
 288                 uint32 dist;
 289
 290                 if (!S_ISREG(fp->mode) || !fp->length
 291                     || fp->flags & FLAG_NO_FUZZY)
 292                         continue;
 293
 294                 name = fp->basename;
 295
 296                 if (fp->length == file->length
 297                     && fp->modtime == file->modtime) {
 298                         if (verbose > 4) {
 299                                 rprintf(FINFO,
 300                                         "fuzzy size/modtime match for %s\n",
 301                                         name);
 302                         }
 303                         return j;
 304                 }
 305
 306                 len = strlen(name);
 307                 suf = find_filename_suffix(name, len, &suf_len);
 308
 309                 dist = fuzzy_distance(name, len, fname, fname_len);
 310                 /* Add some extra weight to how well the suffixes match. */
 311                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 312                       * 10;
 313                 if (verbose > 4) {
 314                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 315                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 316                 }
 317                 if (dist <= lowest_dist) {
 318                         lowest_dist = dist;
 319                         lowest_j = j;
 320                 }
 321         }
 322
 323         return lowest_j;
 324 }
 325
 326
 327 /* Acts on flist->file's ndx'th item, whose name is fname.  If a directory,
 328  * make sure it exists, and has the right permissions/timestamp info.  For
 329  * all other non-regular files (symlinks, etc.) we create them here.  For
 330  * regular files that have changed, we try to find a basis file and then
 331  * start sending checksums.
 332  *
 333  * Note that f_out is set to -1 when doing final directory-permission and
 334  * modification-time repair. */
 335 static void recv_generator(char *fname, struct file_list *flist,
 336                            struct file_struct *file, int ndx,
 337                            int f_out, int f_out_name)
 338 {
 339         static int missing_below = -1;
 340         static char *fuzzy_dirname = NULL;
 341         static struct file_list *fuzzy_dirlist = NULL;
 342         struct file_struct *fuzzy_file = NULL;
 343         int fd = -1, f_copy = -1;
 344         STRUCT_STAT st, partial_st;
 345         struct file_struct *back_file = NULL;
 346         int statret, stat_errno;
 347         char *fnamecmp, *partialptr, *backupptr = NULL;
 348         char fnamecmpbuf[MAXPATHLEN];
 349         uchar fnamecmp_type;
 350         int maybe_DEL_TERSE = itemize_changes ? 0 : DEL_TERSE;
 351         int maybe_PERMS_REPORT = itemize_changes ? 0 : PERMS_REPORT;
 352
 353         if (list_only)
 354                 return;
 355
 356         if (!fname) {
 357                 if (fuzzy_dirlist) {
 358                         flist_free(fuzzy_dirlist);
 359                         fuzzy_dirlist = NULL;
 360                         fuzzy_dirname = NULL;
 361                 }
 362                 if (missing_below >= 0) {
 363                         dry_run--;
 364                         missing_below = -1;
 365                 }
 366                 return;
 367         }
 368
 369         if (verbose > 2) {
 370                 rprintf(FINFO, "recv_generator(%s,%d)\n",
 371                         safe_fname(fname), ndx);
 372         }
 373
 374         if (server_filter_list.head
 375             && check_filter(&server_filter_list, fname,
 376                             S_ISDIR(file->mode)) < 0) {
 377                 if (verbose) {
 378                         rprintf(FINFO, "skipping server-excluded file \"%s\"\n",
 379                                 safe_fname(fname));
 380                 }
 381                 return;
 382         }
 383
 384         if (missing_below >= 0 && file->dir.depth <= missing_below) {
 385                 dry_run--;
 386                 missing_below = -1;
 387         }
 388         if (dry_run > 1) {
 389                 statret = -1;
 390                 stat_errno = ENOENT;
 391         } else {
 392                 if (fuzzy_basis && S_ISREG(file->mode)) {
 393                         char *dn = file->dirname ? file->dirname : ".";
 394                         /* Yes, identical dirnames are guaranteed to have
 395                          * identical pointers at this point. */
 396                         if (fuzzy_dirname != dn) {
 397                                 if (fuzzy_dirlist)
 398                                         flist_free(fuzzy_dirlist);
 399                                 fuzzy_dirname = dn;
 400                                 fuzzy_dirlist = get_dirlist(fuzzy_dirname, 1);
 401                         }
 402                 }
 403
 404                 statret = link_stat(fname, &st,
 405                                     keep_dirlinks && S_ISDIR(file->mode));
 406                 stat_errno = errno;
 407         }
 408
 409         if (only_existing && statret == -1 && stat_errno == ENOENT) {
 410                 /* we only want to update existing files */
 411                 if (verbose > 1) {
 412                         rprintf(FINFO, "not creating new file \"%s\"\n",
 413                                 safe_fname(fname));
 414                 }
 415                 return;
 416         }
 417
 418         if (statret == 0 && !preserve_perms
 419             && S_ISDIR(st.st_mode) == S_ISDIR(file->mode)) {
 420                 /* if the file exists already and we aren't perserving
 421                  * permissions then act as though the remote end sent
 422                  * us the file permissions we already have */
 423                 file->mode = (file->mode & ~CHMOD_BITS)
 424                            | (st.st_mode & CHMOD_BITS);
 425         }
 426
 427         if (S_ISDIR(file->mode)) {
 428                 /* The file to be received is a directory, so we need
 429                  * to prepare appropriately.  If there is already a
 430                  * file of that name and it is *not* a directory, then
 431                  * we need to delete it.  If it doesn't exist, then
 432                  * (perhaps recursively) create it. */
 433                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
 434                         delete_file(fname, st.st_mode, maybe_DEL_TERSE);
 435                         statret = -1;
 436                 }
 437                 if (dry_run && statret != 0 && missing_below < 0) {
 438                         missing_below = file->dir.depth;
 439                         dry_run++;
 440                 }
 441                 if (protocol_version >= 29 && f_out != -1)
 442                         itemize(file, statret, &st, 0, f_out, ndx);
 443                 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
 444                         if (!relative_paths || errno != ENOENT
 445                             || create_directory_path(fname, orig_umask) < 0
 446                             || do_mkdir(fname, file->mode) < 0) {
 447                                 rsyserr(FERROR, errno,
 448                                         "recv_generator: mkdir %s failed",
 449                                         full_fname(fname));
 450                         }
 451                 }
 452                 if (set_perms(fname, file, statret ? NULL : &st, 0)
 453                     && verbose && protocol_version < 29 && f_out != -1)
 454                         rprintf(FINFO, "%s/\n", safe_fname(fname));
 455                 if (delete_during && f_out != -1 && csum_length != SUM_LENGTH
 456                     && (file->flags & FLAG_DEL_HERE))
 457                         delete_in_dir(flist, fname, file);
 458                 return;
 459         }
 460
 461         if (max_size && file->length > max_size) {
 462                 if (verbose > 1) {
 463                         rprintf(FINFO, "%s is over max-size\n",
 464                                 safe_fname(fname));
 465                 }
 466                 return;
 467         }
 468
 469         if (preserve_links && S_ISLNK(file->mode)) {
 470 #ifdef SUPPORT_LINKS
 471                 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
 472                         if (verbose) {
 473                                 rprintf(FINFO,
 474                                         "ignoring unsafe symlink %s -> \"%s\"\n",
 475                                         full_fname(fname),
 476                                         safe_fname(file->u.link));
 477                         }
 478                         return;
 479                 }
 480                 if (statret == 0) {
 481                         char lnk[MAXPATHLEN];
 482                         int len;
 483
 484                         if (!S_ISDIR(st.st_mode)
 485                             && (len = readlink(fname, lnk, MAXPATHLEN-1)) > 0) {
 486                                 lnk[len] = 0;
 487                                 /* A link already pointing to the
 488                                  * right place -- no further action
 489                                  * required. */
 490                                 if (strcmp(lnk, file->u.link) == 0) {
 491                                         if (protocol_version >= 29) {
 492                                                 itemize(file, 0, &st, 0,
 493                                                         f_out, ndx);
 494                                         }
 495                                         set_perms(fname, file, &st,
 496                                                   maybe_PERMS_REPORT);
 497                                         return;
 498                                 }
 499                         }
 500                         /* Not the right symlink (or not a symlink), so
 501                          * delete it. */
 502                         if (S_ISLNK(st.st_mode))
 503                                 delete_file(fname, st.st_mode, DEL_TERSE);
 504                         else {
 505                                 delete_file(fname, st.st_mode, maybe_DEL_TERSE);
 506                                 statret = -1;
 507                         }
 508                 }
 509                 if (do_symlink(file->u.link,fname) != 0) {
 510                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
 511                                 full_fname(fname), safe_fname(file->u.link));
 512                 } else {
 513                         set_perms(fname,file,NULL,0);
 514                         if (protocol_version >= 29) {
 515                                 itemize(file, statret, &st, SID_UPDATING,
 516                                         f_out, ndx);
 517                         } else if (verbose) {
 518                                 rprintf(FINFO, "%s -> %s\n", safe_fname(fname),
 519                                         safe_fname(file->u.link));
 520                         }
 521                 }
 522 #endif
 523                 return;
 524         }
 525
 526         if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
 527                 if (statret != 0 ||
 528                     st.st_mode != file->mode ||
 529                     st.st_rdev != file->u.rdev) {
 530                         if (IS_DEVICE(st.st_mode))
 531                                 delete_file(fname, st.st_mode, DEL_TERSE);
 532                         else {
 533                                 delete_file(fname, st.st_mode, maybe_DEL_TERSE);
 534                                 statret = -1;
 535                         }
 536                         if (verbose > 2) {
 537                                 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
 538                                         safe_fname(fname),
 539                                         (int)file->mode, (int)file->u.rdev);
 540                         }
 541                         if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
 542                                 rsyserr(FERROR, errno, "mknod %s failed",
 543                                         full_fname(fname));
 544                         } else {
 545                                 set_perms(fname,file,NULL,0);
 546                                 if (protocol_version >= 29) {
 547                                         itemize(file, statret, &st, SID_UPDATING,
 548                                                 f_out, ndx);
 549                                 } else if (verbose) {
 550                                         rprintf(FINFO, "%s\n",
 551                                                 safe_fname(fname));
 552                                 }
 553                         }
 554                 } else {
 555                         if (protocol_version >= 29) {
 556                                 itemize(file, statret, &st, 0,
 557                                         f_out, ndx);
 558                         }
 559                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 560                 }
 561                 return;
 562         }
 563
 564         if (preserve_hard_links && hard_link_check(file, HL_CHECK_MASTER))
 565                 return;
 566
 567         if (!S_ISREG(file->mode)) {
 568                 rprintf(FINFO, "skipping non-regular file \"%s\"\n",
 569                         safe_fname(fname));
 570                 return;
 571         }
 572
 573         fnamecmp = fname;
 574         fnamecmp_type = FNAMECMP_FNAME;
 575
 576         if (statret != 0 && basis_dir[0] != NULL) {
 577                 int fallback_match = -1;
 578                 int match_level = 0;
 579                 int i = 0;
 580                 do {
 581                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 582                                  basis_dir[i], fname);
 583                         if (link_stat(fnamecmpbuf, &st, 0) == 0
 584                             && S_ISREG(st.st_mode)) {
 585                                 statret = 0;
 586                                 if (link_dest) {
 587                                         if (!match_level) {
 588                                                 fallback_match = i;
 589                                                 match_level = 1;
 590                                         } else if (match_level == 2
 591                                             && !unchanged_attrs(file, &st))
 592                                                 continue;
 593                                         if (!unchanged_file(fnamecmpbuf, file, &st))
 594                                                 continue;
 595                                         fallback_match = i;
 596                                         match_level = 2;
 597                                         if (!unchanged_attrs(file, &st))
 598                                                 continue;
 599                                 }
 600                                 match_level = 3;
 601                                 break;
 602                         }
 603                 } while (basis_dir[++i] != NULL);
 604                 if (statret == 0) {
 605                         if (match_level < 3) {
 606                                 i = fallback_match;
 607                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 608                                          basis_dir[i], fname);
 609                         }
 610 #ifdef HAVE_LINK
 611                         if (link_dest && match_level == 3 && !dry_run) {
 612                                 if (do_link(fnamecmpbuf, fname) < 0) {
 613                                         if (verbose) {
 614                                                 rsyserr(FINFO, errno,
 615                                                         "link %s => %s",
 616                                                         full_fname(fnamecmpbuf),
 617                                                         safe_fname(fname));
 618                                         }
 619                                         fnamecmp = fnamecmpbuf;
 620                                         fnamecmp_type = i;
 621                                 }
 622                         } else
 623 #endif
 624                         {
 625                                 fnamecmp = fnamecmpbuf;
 626                                 fnamecmp_type = i;
 627                         }
 628                 }
 629         }
 630
 631         if (statret == 0 && !S_ISREG(st.st_mode)) {
 632                 if (delete_file(fname, st.st_mode, maybe_DEL_TERSE) != 0)
 633                         return;
 634                 statret = -1;
 635                 stat_errno = ENOENT;
 636         }
 637
 638         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
 639             && link_stat(partialptr, &partial_st, 0) == 0
 640             && S_ISREG(partial_st.st_mode)) {
 641                 if (statret != 0)
 642                         goto prepare_to_open;
 643         } else
 644                 partialptr = NULL;
 645
 646         if (statret != 0 && fuzzy_basis && dry_run <= 1) {
 647                 int j = find_fuzzy(file, fuzzy_dirlist);
 648                 if (j >= 0) {
 649                         fuzzy_file = fuzzy_dirlist->files[j];
 650                         f_name_to(fuzzy_file, fnamecmpbuf);
 651                         if (verbose > 2) {
 652                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
 653                                         safe_fname(fname), safe_fname(fnamecmpbuf));
 654                         }
 655                         st.st_mode = fuzzy_file->mode;
 656                         st.st_size = fuzzy_file->length;
 657                         st.st_mtime = fuzzy_file->modtime;
 658                         statret = 0;
 659                         fnamecmp = fnamecmpbuf;
 660                         fnamecmp_type = FNAMECMP_FUZZY;
 661                 }
 662         }
 663
 664         if (statret != 0) {
 665                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 666                         return;
 667                 if (stat_errno == ENOENT)
 668                         goto notify_others;
 669                 if (verbose > 1) {
 670                         rsyserr(FERROR, stat_errno,
 671                                 "recv_generator: failed to stat %s",
 672                                 full_fname(fname));
 673                 }
 674                 return;
 675         }
 676
 677         if (opt_ignore_existing && fnamecmp_type == FNAMECMP_FNAME) {
 678                 if (verbose > 1)
 679                         rprintf(FINFO, "%s exists\n", safe_fname(fname));
 680                 return;
 681         }
 682
 683         if (update_only && fnamecmp_type == FNAMECMP_FNAME
 684             && cmp_modtime(st.st_mtime, file->modtime) > 0) {
 685                 if (verbose > 1)
 686                         rprintf(FINFO, "%s is newer\n", safe_fname(fname));
 687                 return;
 688         }
 689
 690         if (!compare_dest && fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
 691                 ;
 692         else if (fnamecmp_type == FNAMECMP_FUZZY)
 693                 ;
 694         else if (unchanged_file(fnamecmp, file, &st)) {
 695                 if (protocol_version >= 29) {
 696                         itemize(file, statret, &st,
 697                                 fnamecmp_type == FNAMECMP_FNAME
 698                                                ? 0 : SID_NO_DEST_AND_NO_UPDATE,
 699                                 f_out, ndx);
 700                 }
 701                 if (fnamecmp_type == FNAMECMP_FNAME)
 702                         set_perms(fname, file, &st, maybe_PERMS_REPORT);
 703                 return;
 704         }
 705
 706 prepare_to_open:
 707         if (partialptr) {
 708                 st = partial_st;
 709                 fnamecmp = partialptr;
 710                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
 711                 statret = 0;
 712         }
 713
 714         if (dry_run || read_batch)
 715                 goto notify_others;
 716         if (whole_file > 0) {
 717                 if (statret == 0)
 718                         statret = 1;
 719                 goto notify_others;
 720         }
 721
 722         if (fuzzy_basis) {
 723                 int j = flist_find(fuzzy_dirlist, file);
 724                 if (j >= 0) /* don't use changing file as future fuzzy basis */
 725                         fuzzy_dirlist->files[j]->flags |= FLAG_NO_FUZZY;
 726         }
 727
 728         /* open the file */
 729         fd = do_open(fnamecmp, O_RDONLY, 0);
 730
 731         if (fd == -1) {
 732                 rsyserr(FERROR, errno, "failed to open %s, continuing",
 733                         full_fname(fnamecmp));
 734             pretend_missing:
 735                 /* pretend the file didn't exist */
 736                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 737                         return;
 738                 statret = -1;
 739                 goto notify_others;
 740         }
 741
 742         if (inplace && make_backups) {
 743                 if (!(backupptr = get_backup_name(fname))) {
 744                         close(fd);
 745                         return;
 746                 }
 747                 if (!(back_file = make_file(fname, NULL, NO_FILTERS))) {
 748                         close(fd);
 749                         goto pretend_missing;
 750                 }
 751                 if (robust_unlink(backupptr) && errno != ENOENT) {
 752                         rsyserr(FERROR, errno, "unlink %s",
 753                                 full_fname(backupptr));
 754                         free(back_file);
 755                         close(fd);
 756                         return;
 757                 }
 758                 if ((f_copy = do_open(backupptr,
 759                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
 760                         rsyserr(FERROR, errno, "open %s",
 761                                 full_fname(backupptr));
 762                         free(back_file);
 763                         close(fd);
 764                         return;
 765                 }
 766                 fnamecmp_type = FNAMECMP_BACKUP;
 767         }
 768
 769         if (verbose > 3) {
 770                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
 771                         safe_fname(fnamecmp), (double)st.st_size);
 772         }
 773
 774         if (verbose > 2)
 775                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
 776
 777 notify_others:
 778         write_int(f_out, ndx);
 779         if (protocol_version >= 29) {
 780                 itemize(file, statret, &st, SID_UPDATING
 781                         | (always_checksum ? SID_REPORT_CHECKSUM : 0),
 782                         f_out, -1);
 783                 if (inplace && !read_batch)
 784                         write_byte(f_out, fnamecmp_type);
 785         }
 786         if (f_out_name >= 0) {
 787                 write_byte(f_out_name, fnamecmp_type);
 788                 if (fnamecmp_type == FNAMECMP_FUZZY) {
 789                         uchar lenbuf[3], *lb = lenbuf;
 790                         int len = strlen(fuzzy_file->basename);
 791                         if (len > 0x7F) {
 792 #if MAXPATHLEN > 0x7FFF
 793                                 *lb++ = len / 0x10000 + 0x80;
 794                                 *lb++ = len / 0x100;
 795 #else
 796                                 *lb++ = len / 0x100 + 0x80;
 797 #endif
 798                         }
 799                         *lb = len;
 800                         write_buf(f_out_name, lenbuf, lb - lenbuf + 1);
 801                         write_buf(f_out_name, fuzzy_file->basename, len);
 802                 }
 803         }
 804
 805         if (dry_run || read_batch)
 806                 return;
 807
 808         if (statret == 0) {
 809                 generate_and_send_sums(fd, st.st_size, f_out, f_copy);
 810
 811                 if (f_copy >= 0) {
 812                         close(f_copy);
 813                         set_perms(backupptr, back_file, NULL, 0);
 814                         if (verbose > 1) {
 815                                 rprintf(FINFO, "backed up %s to %s\n",
 816                                         safe_fname(fname), safe_fname(backupptr));
 817                         }
 818                         free(back_file);
 819                 }
 820
 821                 close(fd);
 822         } else
 823                 write_sum_head(f_out, NULL);
 824 }
 825
 826
 827 void generate_files(int f_out, struct file_list *flist, char *local_name,
 828                     int f_out_name)
 829 {
 830         int i;
 831         int phase = 0;
 832         char fbuf[MAXPATHLEN];
 833         int need_retouch_dir_times = preserve_times && !omit_dir_times;
 834         int need_retouch_dir_perms = 0;
 835         int save_only_existing = only_existing;
 836         int save_opt_ignore_existing = opt_ignore_existing;
 837
 838         if (verbose > 2) {
 839                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
 840                         (long)getpid(), flist->count);
 841         }
 842
 843         if (verbose >= 2) {
 844                 rprintf(FINFO,
 845                         whole_file > 0
 846                         ? "delta-transmission disabled for local transfer or --whole-file\n"
 847                         : "delta transmission enabled\n");
 848         }
 849
 850         /* We expect to just sit around now, so don't exit on a timeout.
 851          * If we really get a timeout then the other process should exit. */
 852         io_timeout = 0;
 853
 854         for (i = 0; i < flist->count; i++) {
 855                 struct file_struct *file = flist->files[i];
 856                 struct file_struct copy;
 857
 858                 if (!file->basename)
 859                         continue;
 860
 861                 /* We need to ensure that any dirs we create have writeable
 862                  * permissions during the time we are putting files within
 863                  * them.  This is then fixed after the transfer is done. */
 864                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)) {
 865                         copy = *file;
 866                         copy.mode |= S_IWUSR; /* user write */
 867                         file = &copy;
 868                         need_retouch_dir_perms = 1;
 869                 }
 870
 871                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
 872                                flist, file, i, f_out, f_out_name);
 873         }
 874         recv_generator(NULL, NULL, NULL, 0, -1, -1);
 875         if (delete_during)
 876                 delete_in_dir(NULL, NULL, NULL);
 877
 878         phase++;
 879         csum_length = SUM_LENGTH;
 880         only_existing = max_size = opt_ignore_existing = 0;
 881         update_only = always_checksum = size_only = 0;
 882         ignore_times = 1;
 883
 884         if (verbose > 2)
 885                 rprintf(FINFO,"generate_files phase=%d\n",phase);
 886
 887         write_int(f_out, -1);
 888
 889         /* files can cycle through the system more than once
 890          * to catch initial checksum errors */
 891         while ((i = get_redo_num()) != -1) {
 892                 struct file_struct *file = flist->files[i];
 893                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
 894                                flist, file, i, f_out, f_out_name);
 895         }
 896
 897         phase++;
 898         only_existing = save_only_existing;
 899         opt_ignore_existing = save_opt_ignore_existing;
 900
 901         if (verbose > 2)
 902                 rprintf(FINFO,"generate_files phase=%d\n",phase);
 903
 904         write_int(f_out, -1);
 905
 906         /* Read post-redo-phase MSG_DONE and any prior messages. */
 907         get_redo_num();
 908
 909         if (preserve_hard_links)
 910                 do_hard_links();
 911
 912         if ((need_retouch_dir_perms || need_retouch_dir_times)
 913             && !list_only && !local_name && !dry_run) {
 914                 /* Now we need to fix any directory permissions that were
 915                  * modified during the transfer and/or re-set any tweaked
 916                  * modified-time values. */
 917                 for (i = 0; i < flist->count; i++) {
 918                         struct file_struct *file = flist->files[i];
 919                         if (!file->basename || !S_ISDIR(file->mode))
 920                                 continue;
 921                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
 922                                 continue;
 923                         recv_generator(local_name ? local_name : f_name(file),
 924                                        flist, file, i, -1, -1);
 925                 }
 926         }
 927         recv_generator(NULL, NULL, NULL, 0, -1, -1);
 928
 929         if (verbose > 2)
 930                 rprintf(FINFO,"generate_files finished\n");
 931 }