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 SC_CHECKSUM_CHANGED (1<<0)
  85 #define SC_UPDATING (1<<1)
  86 #define SC_NO_DEST_AND_NO_UPDATE (1<<2)
  87 #define SC_SKIP_NL (1<<3)
  88
  89 static void showchg(const char *fname, struct file_struct *file, int statret,
  90                     STRUCT_STAT *st, int flags)
  91 {
  92         static char ch[] = "*Xcstpog";
  93         int keep_time;
  94         char *s;
  95
  96         ch[0] = flags & SC_UPDATING ? '*' : ' ';
  97         ch[1] = S_ISDIR(file->mode) ? 'd' : IS_DEVICE(file->mode) ? 'D'
  98               : S_ISLNK(file->mode) ? 'L' : 'f';
  99
 100         if (statret < 0) {
 101                 for (s = ch + 2; *s; ) *s++ = '+';
 102                 goto print_it;
 103         }
 104
 105         keep_time = !preserve_times ? 0
 106                 : S_ISDIR(file->mode) ? !omit_dir_times : !S_ISLNK(file->mode);
 107
 108         ch[2] = !(flags & SC_CHECKSUM_CHANGED) ? '-' : 'c';
 109         ch[3] = !S_ISREG(file->mode) || file->length == st->st_size ? '-' : 's';
 110         ch[4] = flags & SC_UPDATING && !keep_time ? 'T'
 111             : !keep_time || file->modtime == st->st_mtime ? '-' : 't';
 112         ch[5] = !preserve_perms || file->mode == st->st_mode ? '-' : 'p';
 113         ch[6] = !am_root || !preserve_uid || file->uid == st->st_uid ? '-' : 'o';
 114         ch[7] = preserve_gid && file->gid != GID_NONE && st->st_gid != file->gid  ? 'g' : '-';
 115
 116         if (flags & SC_NO_DEST_AND_NO_UPDATE)
 117             ch[4] = ch[5] = ch[6] = ch[7] = '-';
 118
 119         if (!(flags & SC_UPDATING)) {
 120                 for (s = ch + 2; *s == '-'; s++) {}
 121                 if (!*s)
 122                         return;
 123         }
 124
 125     print_it:
 126         rprintf(FINFO, "%s %s%s%s", ch, safe_fname(fname),
 127                 ch[1] == 'd' ? "/" : "",
 128                 flags & SC_SKIP_NL ? "" : "\n");
 129 }
 130
 131
 132 /* Perform our quick-check heuristic for determining if a file is unchanged. */
 133 static int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
 134 {
 135         if (st->st_size != file->length)
 136                 return 0;
 137
 138         /* if always checksum is set then we use the checksum instead
 139            of the file time to determine whether to sync */
 140         if (always_checksum && S_ISREG(st->st_mode)) {
 141                 char sum[MD4_SUM_LENGTH];
 142                 file_checksum(fn, sum, st->st_size);
 143                 return memcmp(sum, file->u.sum, protocol_version < 21 ? 2
 144                                                         : MD4_SUM_LENGTH) == 0;
 145         }
 146
 147         if (size_only)
 148                 return 1;
 149
 150         if (ignore_times)
 151                 return 0;
 152
 153         return cmp_modtime(st->st_mtime, file->modtime) == 0;
 154 }
 155
 156
 157 /*
 158  * set (initialize) the size entries in the per-file sum_struct
 159  * calculating dynamic block and checksum sizes.
 160  *
 161  * This is only called from generate_and_send_sums() but is a separate
 162  * function to encapsulate the logic.
 163  *
 164  * The block size is a rounded square root of file length.
 165  *
 166  * The checksum size is determined according to:
 167  *     blocksum_bits = BLOCKSUM_EXP + 2*log2(file_len) - log2(block_len)
 168  * provided by Donovan Baarda which gives a probability of rsync
 169  * algorithm corrupting data and falling back using the whole md4
 170  * checksums.
 171  *
 172  * This might be made one of several selectable heuristics.
 173  */
 174 static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
 175 {
 176         int32 blength;
 177         int s2length;
 178
 179         if (block_size)
 180                 blength = block_size;
 181         else if (len <= BLOCK_SIZE * BLOCK_SIZE)
 182                 blength = BLOCK_SIZE;
 183         else {
 184                 int32 c;
 185                 int64 l;
 186                 int cnt;
 187                 for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
 188                 if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
 189                         blength = MAX_BLOCK_SIZE;
 190                 else {
 191                     blength = 0;
 192                     do {
 193                             blength |= c;
 194                             if (len < (int64)blength * blength)
 195                                     blength &= ~c;
 196                             c >>= 1;
 197                     } while (c >= 8);   /* round to multiple of 8 */
 198                     blength = MAX(blength, BLOCK_SIZE);
 199                 }
 200         }
 201
 202         if (protocol_version < 27) {
 203                 s2length = csum_length;
 204         } else if (csum_length == SUM_LENGTH) {
 205                 s2length = SUM_LENGTH;
 206         } else {
 207                 int32 c;
 208                 int64 l;
 209                 int b = BLOCKSUM_BIAS;
 210                 for (l = len; l >>= 1; b += 2) {}
 211                 for (c = blength; c >>= 1 && b; b--) {}
 212                 /* add a bit, subtract rollsum, round up. */
 213                 s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
 214                 s2length = MAX(s2length, csum_length);
 215                 s2length = MIN(s2length, SUM_LENGTH);
 216         }
 217
 218         sum->flength    = len;
 219         sum->blength    = blength;
 220         sum->s2length   = s2length;
 221         sum->count      = (len + (blength - 1)) / blength;
 222         sum->remainder  = (len % blength);
 223
 224         if (sum->count && verbose > 2) {
 225                 rprintf(FINFO,
 226                         "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
 227                         (double)sum->count, (long)sum->remainder, (long)sum->blength,
 228                         sum->s2length, (double)sum->flength);
 229         }
 230 }
 231
 232
 233 /*
 234  * Generate and send a stream of signatures/checksums that describe a buffer
 235  *
 236  * Generate approximately one checksum every block_len bytes.
 237  */
 238 static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 239 {
 240         int32 i;
 241         struct map_struct *mapbuf;
 242         struct sum_struct sum;
 243         OFF_T offset = 0;
 244
 245         sum_sizes_sqroot(&sum, len);
 246
 247         if (len > 0)
 248                 mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
 249         else
 250                 mapbuf = NULL;
 251
 252         write_sum_head(f_out, &sum);
 253
 254         for (i = 0; i < sum.count; i++) {
 255                 int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
 256                 char *map = map_ptr(mapbuf, offset, n1);
 257                 uint32 sum1 = get_checksum1(map, n1);
 258                 char sum2[SUM_LENGTH];
 259
 260                 if (f_copy >= 0)
 261                         full_write(f_copy, map, n1);
 262
 263                 get_checksum2(map, n1, sum2);
 264
 265                 if (verbose > 3) {
 266                         rprintf(FINFO,
 267                                 "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
 268                                 (double)i, (double)offset, (long)n1,
 269                                 (unsigned long)sum1);
 270                 }
 271                 write_int(f_out, sum1);
 272                 write_buf(f_out, sum2, sum.s2length);
 273                 len -= n1;
 274                 offset += n1;
 275         }
 276
 277         if (mapbuf)
 278                 unmap_file(mapbuf);
 279 }
 280
 281
 282 /* Try to find a filename in the same dir as "fname" with a similar name. */
 283 static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
 284 {
 285         int fname_len, fname_suf_len;
 286         const char *fname_suf, *fname = file->basename;
 287         uint32 lowest_dist = 0x7FFFFFFF;
 288         int j, lowest_j = -1;
 289
 290         fname_len = strlen(fname);
 291         fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
 292
 293         for (j = 0; j < dirlist->count; j++) {
 294                 struct file_struct *fp = dirlist->files[j];
 295                 const char *suf, *name;
 296                 int len, suf_len;
 297                 uint32 dist;
 298
 299                 if (!S_ISREG(fp->mode) || !fp->length
 300                     || fp->flags & FLAG_NO_FUZZY)
 301                         continue;
 302
 303                 name = fp->basename;
 304
 305                 if (fp->length == file->length
 306                     && fp->modtime == file->modtime) {
 307                         if (verbose > 4) {
 308                                 rprintf(FINFO,
 309                                         "fuzzy size/modtime match for %s\n",
 310                                         name);
 311                         }
 312                         return j;
 313                 }
 314
 315                 len = strlen(name);
 316                 suf = find_filename_suffix(name, len, &suf_len);
 317
 318                 dist = fuzzy_distance(name, len, fname, fname_len);
 319                 /* Add some extra weight to how well the suffixes match. */
 320                 dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
 321                       * 10;
 322                 if (verbose > 4) {
 323                         rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
 324                                 name, (int)(dist>>16), (int)(dist&0xFFFF));
 325                 }
 326                 if (dist <= lowest_dist) {
 327                         lowest_dist = dist;
 328                         lowest_j = j;
 329                 }
 330         }
 331
 332         return lowest_j;
 333 }
 334
 335
 336 /* Acts on flist->file's ndx'th item, whose name is fname.  If a directory,
 337  * make sure it exists, and has the right permissions/timestamp info.  For
 338  * all other non-regular files (symlinks, etc.) we create them here.  For
 339  * regular files that have changed, we try to find a basis file and then
 340  * start sending checksums.
 341  *
 342  * Note that f_out is set to -1 when doing final directory-permission and
 343  * modification-time repair. */
 344 static void recv_generator(char *fname, struct file_list *flist,
 345                            struct file_struct *file, int ndx,
 346                            int f_out, int f_out_name)
 347 {
 348         static int missing_below = -1;
 349         static char *fuzzy_dirname = NULL;
 350         static struct file_list *fuzzy_dirlist = NULL;
 351         struct file_struct *fuzzy_file = NULL;
 352         int fd = -1, f_copy = -1;
 353         STRUCT_STAT st, partial_st;
 354         struct file_struct *back_file = NULL;
 355         int statret, stat_errno;
 356         char *fnamecmp, *partialptr, *backupptr = NULL;
 357         char fnamecmpbuf[MAXPATHLEN];
 358         uchar fnamecmp_type;
 359
 360         if (list_only)
 361                 return;
 362
 363         if (!fname) {
 364                 if (fuzzy_dirlist) {
 365                         flist_free(fuzzy_dirlist);
 366                         fuzzy_dirlist = NULL;
 367                         fuzzy_dirname = NULL;
 368                 }
 369                 if (missing_below >= 0) {
 370                         dry_run--;
 371                         missing_below = -1;
 372                 }
 373                 return;
 374         }
 375
 376         if (verbose > 2) {
 377                 rprintf(FINFO, "recv_generator(%s,%d)\n",
 378                         safe_fname(fname), ndx);
 379         }
 380
 381         if (server_filter_list.head
 382             && check_filter(&server_filter_list, fname,
 383                             S_ISDIR(file->mode)) < 0) {
 384                 if (verbose) {
 385                         rprintf(FINFO, "skipping server-excluded file \"%s\"\n",
 386                                 safe_fname(fname));
 387                 }
 388                 return;
 389         }
 390
 391         if (missing_below >= 0 && file->dir.depth <= missing_below) {
 392                 dry_run--;
 393                 missing_below = -1;
 394         }
 395         if (dry_run > 1) {
 396                 statret = -1;
 397                 stat_errno = ENOENT;
 398         } else {
 399                 if (fuzzy_basis && S_ISREG(file->mode)) {
 400                         char *dn = file->dirname ? file->dirname : ".";
 401                         /* Yes, identical dirnames are guaranteed to have
 402                          * identical pointers at this point. */
 403                         if (fuzzy_dirname != dn) {
 404                                 if (fuzzy_dirlist)
 405                                         flist_free(fuzzy_dirlist);
 406                                 fuzzy_dirname = dn;
 407                                 fuzzy_dirlist = get_dirlist(fuzzy_dirname, 1);
 408                         }
 409                 }
 410
 411                 statret = link_stat(fname, &st,
 412                                     keep_dirlinks && S_ISDIR(file->mode));
 413                 stat_errno = errno;
 414         }
 415
 416         if (only_existing && statret == -1 && stat_errno == ENOENT) {
 417                 /* we only want to update existing files */
 418                 if (verbose > 1) {
 419                         rprintf(FINFO, "not creating new file \"%s\"\n",
 420                                 safe_fname(fname));
 421                 }
 422                 return;
 423         }
 424
 425         if (statret == 0 && !preserve_perms
 426             && S_ISDIR(st.st_mode) == S_ISDIR(file->mode)) {
 427                 /* if the file exists already and we aren't perserving
 428                  * permissions then act as though the remote end sent
 429                  * us the file permissions we already have */
 430                 file->mode = (file->mode & ~CHMOD_BITS)
 431                            | (st.st_mode & CHMOD_BITS);
 432         }
 433
 434         if (S_ISDIR(file->mode)) {
 435                 /* The file to be received is a directory, so we need
 436                  * to prepare appropriately.  If there is already a
 437                  * file of that name and it is *not* a directory, then
 438                  * we need to delete it.  If it doesn't exist, then
 439                  * (perhaps recursively) create it. */
 440                 if (statret == 0 && !S_ISDIR(st.st_mode)) {
 441                         delete_file(fname, DEL_TERSE);
 442                         statret = -1;
 443                 }
 444                 if (dry_run && statret != 0 && missing_below < 0) {
 445                         missing_below = file->dir.depth;
 446                         dry_run++;
 447                 }
 448                 if (itemize_changes && f_out != -1)
 449                         showchg(fname, file, statret, &st, 0);
 450                 if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
 451                         if (!relative_paths || errno != ENOENT
 452                             || create_directory_path(fname, orig_umask) < 0
 453                             || do_mkdir(fname, file->mode) < 0) {
 454                                 rsyserr(FERROR, errno,
 455                                         "recv_generator: mkdir %s failed",
 456                                         full_fname(fname));
 457                         }
 458                 }
 459                 if (set_perms(fname, file, statret ? NULL : &st, 0)
 460                     && verbose && f_out != -1 && !itemize_changes)
 461                         rprintf(FINFO, "%s/\n", safe_fname(fname));
 462                 if (delete_during && f_out != -1 && csum_length != SUM_LENGTH
 463                     && (file->flags & FLAG_DEL_HERE))
 464                         delete_in_dir(flist, fname, file);
 465                 return;
 466         }
 467
 468         if (max_size && file->length > max_size) {
 469                 if (verbose > 1) {
 470                         rprintf(FINFO, "%s is over max-size\n",
 471                                 safe_fname(fname));
 472                 }
 473                 return;
 474         }
 475
 476         if (preserve_links && S_ISLNK(file->mode)) {
 477 #ifdef SUPPORT_LINKS
 478                 if (safe_symlinks && unsafe_symlink(file->u.link, fname)) {
 479                         if (verbose) {
 480                                 rprintf(FINFO,
 481                                         "ignoring unsafe symlink %s -> \"%s\"\n",
 482                                         full_fname(fname),
 483                                         safe_fname(file->u.link));
 484                         }
 485                         return;
 486                 }
 487                 if (statret == 0) {
 488                         int dflag = S_ISDIR(st.st_mode) ? DEL_DIR : 0;
 489                         char lnk[MAXPATHLEN];
 490                         int len;
 491
 492                         if (!dflag
 493                             && (len = readlink(fname, lnk, MAXPATHLEN-1)) > 0) {
 494                                 lnk[len] = 0;
 495                                 /* A link already pointing to the
 496                                  * right place -- no further action
 497                                  * required. */
 498                                 if (strcmp(lnk, file->u.link) == 0) {
 499                                         if (itemize_changes)
 500                                                 showchg(fname, file, 0, &st, 0);
 501                                         set_perms(fname, file, &st,
 502                                                   PERMS_REPORT);
 503                                         return;
 504                                 }
 505                         }
 506                         /* Not the right symlink (or not a symlink), so
 507                          * delete it. */
 508                         delete_file(fname, dflag | DEL_TERSE);
 509                 }
 510                 if (do_symlink(file->u.link,fname) != 0) {
 511                         rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
 512                                 full_fname(fname), safe_fname(file->u.link));
 513                 } else {
 514                         set_perms(fname,file,NULL,0);
 515                         if (itemize_changes) {
 516                                 showchg(fname, file, statret, &st,
 517                                         SC_UPDATING
 518                                         | (verbose ? SC_SKIP_NL : 0));
 519                         }
 520                         if (verbose) {
 521                                 rprintf(FINFO, "%s -> %s\n",
 522                                     itemize_changes ? "" : safe_fname(fname),
 523                                     safe_fname(file->u.link));
 524                         }
 525                 }
 526 #endif
 527                 return;
 528         }
 529
 530         if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
 531                 if (statret != 0 ||
 532                     st.st_mode != file->mode ||
 533                     st.st_rdev != file->u.rdev) {
 534                         int dflag = S_ISDIR(st.st_mode) ? DEL_DIR : 0;
 535                         if (itemize_changes)
 536                                 showchg(fname, file, statret, &st, SC_UPDATING);
 537                         delete_file(fname, dflag | DEL_TERSE);
 538                         if (verbose > 2) {
 539                                 rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
 540                                         safe_fname(fname),
 541                                         (int)file->mode, (int)file->u.rdev);
 542                         }
 543                         if (do_mknod(fname,file->mode,file->u.rdev) != 0) {
 544                                 rsyserr(FERROR, errno, "mknod %s failed",
 545                                         full_fname(fname));
 546                         } else {
 547                                 set_perms(fname,file,NULL,0);
 548                                 if (verbose && !itemize_changes) {
 549                                         rprintf(FINFO, "%s\n",
 550                                                 safe_fname(fname));
 551                                 }
 552                         }
 553                 } else {
 554                         if (itemize_changes)
 555                                 showchg(fname, file, statret, &st, 0);
 556                         set_perms(fname, file, &st, PERMS_REPORT);
 557                 }
 558                 return;
 559         }
 560
 561         if (preserve_hard_links && hard_link_check(file, HL_CHECK_MASTER))
 562                 return;
 563
 564         if (!S_ISREG(file->mode)) {
 565                 rprintf(FINFO, "skipping non-regular file \"%s\"\n",
 566                         safe_fname(fname));
 567                 return;
 568         }
 569
 570         fnamecmp = fname;
 571         fnamecmp_type = FNAMECMP_FNAME;
 572
 573         if (statret != 0 && basis_dir[0] != NULL) {
 574                 int fallback_match = -1;
 575                 int match_level = 0;
 576                 int i = 0;
 577                 do {
 578                         pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 579                                  basis_dir[i], fname);
 580                         if (link_stat(fnamecmpbuf, &st, 0) == 0
 581                             && S_ISREG(st.st_mode)) {
 582                                 statret = 0;
 583                                 if (link_dest) {
 584                                         if (!match_level) {
 585                                                 fallback_match = i;
 586                                                 match_level = 1;
 587                                         } else if (match_level == 2
 588                                             && !unchanged_attrs(file, &st))
 589                                                 continue;
 590                                         if (!unchanged_file(fnamecmpbuf, file, &st))
 591                                                 continue;
 592                                         fallback_match = i;
 593                                         match_level = 2;
 594                                         if (!unchanged_attrs(file, &st))
 595                                                 continue;
 596                                 }
 597                                 match_level = 3;
 598                                 break;
 599                         }
 600                 } while (basis_dir[++i] != NULL);
 601                 if (statret == 0) {
 602                         if (match_level < 3) {
 603                                 i = fallback_match;
 604                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 605                                          basis_dir[i], fname);
 606                         }
 607 #ifdef HAVE_LINK
 608                         if (link_dest && match_level == 3 && !dry_run) {
 609                                 if (do_link(fnamecmpbuf, fname) < 0) {
 610                                         if (verbose) {
 611                                                 rsyserr(FINFO, errno,
 612                                                         "link %s => %s",
 613                                                         full_fname(fnamecmpbuf),
 614                                                         safe_fname(fname));
 615                                         }
 616                                         fnamecmp = fnamecmpbuf;
 617                                         fnamecmp_type = i;
 618                                 }
 619                         } else
 620 #endif
 621                         {
 622                                 fnamecmp = fnamecmpbuf;
 623                                 fnamecmp_type = i;
 624                         }
 625                 }
 626         }
 627
 628         if (statret == 0 && !S_ISREG(st.st_mode)) {
 629                 int dflag = S_ISDIR(st.st_mode) ? DEL_DIR : 0;
 630                 if (delete_file(fname, dflag | DEL_TERSE) != 0)
 631                         return;
 632                 statret = -1;
 633                 stat_errno = ENOENT;
 634         }
 635
 636         if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
 637             && link_stat(partialptr, &partial_st, 0) == 0
 638             && S_ISREG(partial_st.st_mode)) {
 639                 if (statret != 0)
 640                         goto prepare_to_open;
 641         } else
 642                 partialptr = NULL;
 643
 644         if (statret != 0 && fuzzy_basis && dry_run <= 1) {
 645                 int j = find_fuzzy(file, fuzzy_dirlist);
 646                 if (j >= 0) {
 647                         fuzzy_file = fuzzy_dirlist->files[j];
 648                         f_name_to(fuzzy_file, fnamecmpbuf);
 649                         if (verbose > 2) {
 650                                 rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
 651                                         safe_fname(fname), safe_fname(fnamecmpbuf));
 652                         }
 653                         st.st_mode = fuzzy_file->mode;
 654                         st.st_size = fuzzy_file->length;
 655                         st.st_mtime = fuzzy_file->modtime;
 656                         statret = 0;
 657                         fnamecmp = fnamecmpbuf;
 658                         fnamecmp_type = FNAMECMP_FUZZY;
 659                 }
 660         }
 661
 662         if (statret != 0) {
 663                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 664                         return;
 665                 if (stat_errno == ENOENT)
 666                         goto notify_others;
 667                 if (verbose > 1) {
 668                         rsyserr(FERROR, stat_errno,
 669                                 "recv_generator: failed to stat %s",
 670                                 full_fname(fname));
 671                 }
 672                 return;
 673         }
 674
 675         if (opt_ignore_existing && fnamecmp_type == FNAMECMP_FNAME) {
 676                 if (verbose > 1)
 677                         rprintf(FINFO, "%s exists\n", safe_fname(fname));
 678                 return;
 679         }
 680
 681         if (update_only && fnamecmp_type == FNAMECMP_FNAME
 682             && cmp_modtime(st.st_mtime, file->modtime) > 0) {
 683                 if (verbose > 1)
 684                         rprintf(FINFO, "%s is newer\n", safe_fname(fname));
 685                 return;
 686         }
 687
 688         if (!compare_dest && fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
 689                 ;
 690         else if (fnamecmp_type == FNAMECMP_FUZZY)
 691                 ;
 692         else if (unchanged_file(fnamecmp, file, &st)) {
 693                 if (itemize_changes) {
 694                         showchg(fname, file, statret, &st,
 695                                 fnamecmp_type == FNAMECMP_FNAME ? 0
 696                                 : SC_NO_DEST_AND_NO_UPDATE);
 697                 }
 698                 if (fnamecmp_type == FNAMECMP_FNAME)
 699                         set_perms(fname, file, &st, PERMS_REPORT);
 700                 return;
 701         }
 702
 703 prepare_to_open:
 704         if (partialptr) {
 705                 st = partial_st;
 706                 fnamecmp = partialptr;
 707                 fnamecmp_type = FNAMECMP_PARTIAL_DIR;
 708                 statret = 0;
 709         }
 710
 711         if (dry_run || read_batch)
 712                 goto notify_others;
 713         if (whole_file > 0) {
 714                 if (statret == 0)
 715                         statret = 1;
 716                 goto notify_others;
 717         }
 718
 719         if (fuzzy_basis) {
 720                 int j = flist_find(fuzzy_dirlist, file);
 721                 if (j >= 0) /* don't use changing file as future fuzzy basis */
 722                         fuzzy_dirlist->files[j]->flags |= FLAG_NO_FUZZY;
 723         }
 724
 725         /* open the file */
 726         fd = do_open(fnamecmp, O_RDONLY, 0);
 727
 728         if (fd == -1) {
 729                 rsyserr(FERROR, errno, "failed to open %s, continuing",
 730                         full_fname(fnamecmp));
 731             pretend_missing:
 732                 /* pretend the file didn't exist */
 733                 if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 734                         return;
 735                 statret = -1;
 736                 goto notify_others;
 737         }
 738
 739         if (inplace && make_backups) {
 740                 if (!(backupptr = get_backup_name(fname))) {
 741                         close(fd);
 742                         return;
 743                 }
 744                 if (!(back_file = make_file(fname, NULL, NO_FILTERS))) {
 745                         close(fd);
 746                         goto pretend_missing;
 747                 }
 748                 if (robust_unlink(backupptr) && errno != ENOENT) {
 749                         rsyserr(FERROR, errno, "unlink %s",
 750                                 full_fname(backupptr));
 751                         free(back_file);
 752                         close(fd);
 753                         return;
 754                 }
 755                 if ((f_copy = do_open(backupptr,
 756                     O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
 757                         rsyserr(FERROR, errno, "open %s",
 758                                 full_fname(backupptr));
 759                         free(back_file);
 760                         close(fd);
 761                         return;
 762                 }
 763                 fnamecmp_type = FNAMECMP_BACKUP;
 764         }
 765
 766         if (verbose > 3) {
 767                 rprintf(FINFO, "gen mapped %s of size %.0f\n",
 768                         safe_fname(fnamecmp), (double)st.st_size);
 769         }
 770
 771         if (verbose > 2)
 772                 rprintf(FINFO, "generating and sending sums for %d\n", ndx);
 773
 774 notify_others:
 775         write_int(f_out, ndx);
 776         if (protocol_version >= 29 && inplace && !read_batch)
 777                 write_byte(f_out, fnamecmp_type);
 778         if (f_out_name >= 0) {
 779                 write_byte(f_out_name, fnamecmp_type);
 780                 if (fnamecmp_type == FNAMECMP_FUZZY) {
 781                         uchar lenbuf[3], *lb = lenbuf;
 782                         int len = strlen(fuzzy_file->basename);
 783                         if (len > 0x7F) {
 784 #if MAXPATHLEN > 0x7FFF
 785                                 *lb++ = len / 0x10000 + 0x80;
 786                                 *lb++ = len / 0x100;
 787 #else
 788                                 *lb++ = len / 0x100 + 0x80;
 789 #endif
 790                         }
 791                         *lb = len;
 792                         write_buf(f_out_name, lenbuf, lb - lenbuf + 1);
 793                         write_buf(f_out_name, fuzzy_file->basename, len);
 794                 }
 795         }
 796         if (itemize_changes) {
 797                 showchg(fname, file, statret, &st,
 798                         (always_checksum ? SC_CHECKSUM_CHANGED : 0)
 799                         | SC_UPDATING);
 800         }
 801
 802         if (dry_run || read_batch)
 803                 return;
 804
 805         if (statret == 0) {
 806                 generate_and_send_sums(fd, st.st_size, f_out, f_copy);
 807
 808                 if (f_copy >= 0) {
 809                         close(f_copy);
 810                         set_perms(backupptr, back_file, NULL, 0);
 811                         if (verbose > 1) {
 812                                 rprintf(FINFO, "backed up %s to %s\n",
 813                                         safe_fname(fname), safe_fname(backupptr));
 814                         }
 815                         free(back_file);
 816                 }
 817
 818                 close(fd);
 819         } else
 820                 write_sum_head(f_out, NULL);
 821 }
 822
 823
 824 void generate_files(int f_out, struct file_list *flist, char *local_name,
 825                     int f_out_name)
 826 {
 827         int i;
 828         int phase = 0;
 829         char fbuf[MAXPATHLEN];
 830         int need_retouch_dir_times = preserve_times && !omit_dir_times;
 831         int need_retouch_dir_perms = 0;
 832         int save_only_existing = only_existing;
 833         int save_opt_ignore_existing = opt_ignore_existing;
 834
 835         if (verbose > 2) {
 836                 rprintf(FINFO, "generator starting pid=%ld count=%d\n",
 837                         (long)getpid(), flist->count);
 838         }
 839
 840         if (verbose >= 2) {
 841                 rprintf(FINFO,
 842                         whole_file > 0
 843                         ? "delta-transmission disabled for local transfer or --whole-file\n"
 844                         : "delta transmission enabled\n");
 845         }
 846
 847         /* We expect to just sit around now, so don't exit on a timeout.
 848          * If we really get a timeout then the other process should exit. */
 849         io_timeout = 0;
 850
 851         for (i = 0; i < flist->count; i++) {
 852                 struct file_struct *file = flist->files[i];
 853                 struct file_struct copy;
 854
 855                 if (!file->basename)
 856                         continue;
 857
 858                 /* We need to ensure that any dirs we create have writeable
 859                  * permissions during the time we are putting files within
 860                  * them.  This is then fixed after the transfer is done. */
 861                 if (!am_root && S_ISDIR(file->mode) && !(file->mode & S_IWUSR)) {
 862                         copy = *file;
 863                         copy.mode |= S_IWUSR; /* user write */
 864                         file = &copy;
 865                         need_retouch_dir_perms = 1;
 866                 }
 867
 868                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
 869                                flist, file, i, f_out, f_out_name);
 870         }
 871         recv_generator(NULL, NULL, NULL, 0, -1, -1);
 872         if (delete_during)
 873                 delete_in_dir(NULL, NULL, NULL);
 874
 875         phase++;
 876         csum_length = SUM_LENGTH;
 877         only_existing = max_size = opt_ignore_existing = 0;
 878         update_only = always_checksum = size_only = 0;
 879         ignore_times = 1;
 880
 881         if (verbose > 2)
 882                 rprintf(FINFO,"generate_files phase=%d\n",phase);
 883
 884         write_int(f_out, -1);
 885
 886         /* files can cycle through the system more than once
 887          * to catch initial checksum errors */
 888         while ((i = get_redo_num()) != -1) {
 889                 struct file_struct *file = flist->files[i];
 890                 recv_generator(local_name ? local_name : f_name_to(file, fbuf),
 891                                flist, file, i, f_out, f_out_name);
 892         }
 893
 894         phase++;
 895         only_existing = save_only_existing;
 896         opt_ignore_existing = save_opt_ignore_existing;
 897
 898         if (verbose > 2)
 899                 rprintf(FINFO,"generate_files phase=%d\n",phase);
 900
 901         write_int(f_out, -1);
 902
 903         /* Read post-redo-phase MSG_DONE and any prior messages. */
 904         get_redo_num();
 905
 906         if (preserve_hard_links)
 907                 do_hard_links();
 908
 909         if ((need_retouch_dir_perms || need_retouch_dir_times)
 910             && !list_only && !local_name && !dry_run) {
 911                 /* Now we need to fix any directory permissions that were
 912                  * modified during the transfer and/or re-set any tweaked
 913                  * modified-time values. */
 914                 for (i = 0; i < flist->count; i++) {
 915                         struct file_struct *file = flist->files[i];
 916                         if (!file->basename || !S_ISDIR(file->mode))
 917                                 continue;
 918                         if (!need_retouch_dir_times && file->mode & S_IWUSR)
 919                                 continue;
 920                         recv_generator(local_name ? local_name : f_name(file),
 921                                        flist, file, i, -1, -1);
 922                 }
 923         }
 924         recv_generator(NULL, NULL, NULL, 0, -1, -1);
 925
 926         if (verbose > 2)
 927                 rprintf(FINFO,"generate_files finished\n");
 928 }