tests/fssum.c

   1 /*
   2  * Copyright (C) 2012 STRATO AG.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #include "kerncompat.h"
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <unistd.h>
  23 #include <string.h>
  24 #include <fcntl.h>
  25 #include <dirent.h>
  26 #include <errno.h>
  27 #include <sys/sysmacros.h>
  28 #include <sys/stat.h>
  29 #include <assert.h>
  30 #include <time.h>
  31 #include <stdint.h>
  32 #include "tests/sha.h"
  33
  34 #define CS_SIZE 32
  35 #define CHUNKS  128
  36
  37 #ifndef SEEK_DATA
  38 #define SEEK_DATA 3
  39 #define SEEK_HOLE 4
  40 #endif
  41
  42 /* TODO: add hardlink recognition */
  43 /* TODO: add xattr/acl */
  44
  45 struct excludes {
  46         char *path;
  47         int len;
  48 };
  49
  50 typedef struct _sum {
  51         SHA256Context   sha;
  52         unsigned char   out[CS_SIZE];
  53 } sum_t;
  54
  55 typedef int (*sum_file_data_t)(int fd, sum_t *dst);
  56
  57 int gen_manifest = 0;
  58 int in_manifest = 0;
  59 char *checksum = NULL;
  60 struct excludes *excludes;
  61 int n_excludes = 0;
  62 int verbose = 0;
  63 FILE *out_fp;
  64 FILE *in_fp;
  65
  66 enum _flags {
  67         FLAG_UID,
  68         FLAG_GID,
  69         FLAG_MODE,
  70         FLAG_ATIME,
  71         FLAG_MTIME,
  72         FLAG_CTIME,
  73         FLAG_DATA,
  74         FLAG_OPEN_ERROR,
  75         FLAG_STRUCTURE,
  76         NUM_FLAGS
  77 };
  78
  79 const char flchar[] = "ugoamcdes";
  80 char line[65536];
  81
  82 int flags[NUM_FLAGS] = {1, 1, 1, 1, 1, 0, 1, 0, 0};
  83
  84 char *
  85 getln(char *buf, int size, FILE *fp)
  86 {
  87         char *p;
  88         int l;
  89
  90         p = fgets(buf, size, fp);
  91         if (!p)
  92                 return NULL;
  93
  94         l = strlen(p);
  95         while(l > 0  && (p[l - 1] == '\n' || p[l - 1] == '\r'))
  96                 p[--l] = 0;
  97
  98         return p;
  99 }
 100
 101 void
 102 parse_flag(int c)
 103 {
 104         int i;
 105         int is_upper = 0;
 106
 107         if (c >= 'A' && c <= 'Z') {
 108                 is_upper = 1;
 109                 c += 'a' - 'A';
 110         }
 111         for (i = 0; flchar[i]; ++i) {
 112                 if (flchar[i] == c) {
 113                         flags[i] = is_upper ? 0 : 1;
 114                         return;
 115                 }
 116         }
 117         fprintf(stderr, "unrecognized flag %c\n", c);
 118         exit(-1);
 119 }
 120
 121 void
 122 parse_flags(char *p)
 123 {
 124         while (*p)
 125                 parse_flag(*p++);
 126 }
 127
 128 void
 129 usage(void)
 130 {
 131         fprintf(stderr, "usage: fssum <options> <path>\n");
 132         fprintf(stderr, "  options:\n");
 133         fprintf(stderr, "    -f          : write out a full manifest file\n");
 134         fprintf(stderr, "    -w <file>   : send output to file\n");
 135         fprintf(stderr, "    -v          : verbose mode (debugging only)\n");
 136         fprintf(stderr,
 137                 "    -r <file>   : read checksum or manifest from file\n");
 138         fprintf(stderr, "    -[ugoamcde] : specify which fields to include in checksum calculation.\n");
 139         fprintf(stderr, "         u      : include uid\n");
 140         fprintf(stderr, "         g      : include gid\n");
 141         fprintf(stderr, "         o      : include mode\n");
 142         fprintf(stderr, "         m      : include mtime\n");
 143         fprintf(stderr, "         a      : include atime\n");
 144         fprintf(stderr, "         c      : include ctime\n");
 145         fprintf(stderr, "         d      : include file data\n");
 146         fprintf(stderr, "         e      : include open errors (aborts otherwise)\n");
 147         fprintf(stderr, "         s      : include block structure (holes)\n");
 148         fprintf(stderr, "    -[UGOAMCDES]: exclude respective field from calculation\n");
 149         fprintf(stderr, "    -n          : reset all flags\n");
 150         fprintf(stderr, "    -N          : set all flags\n");
 151         fprintf(stderr, "    -x path     : exclude path when building checksum (multiple ok)\n");
 152         fprintf(stderr, "    -h          : this help\n\n");
 153         fprintf(stderr, "The default field mask is ugoamCdES. If the checksum/manifest is read from a\n");
 154         fprintf(stderr, "file, the mask is taken from there and the values given on the command line\n");
 155         fprintf(stderr, "are ignored.\n");
 156         exit(-1);
 157 }
 158
 159 static char buf[65536];
 160
 161 void *
 162 alloc(size_t sz)
 163 {
 164         void *p = malloc(sz);
 165
 166         if (!p) {
 167                 fprintf(stderr, "malloc failed\n");
 168                 exit(-1);
 169         }
 170
 171         return p;
 172 }
 173
 174 void
 175 sum_init(sum_t *cs)
 176 {
 177         SHA256Reset(&cs->sha);
 178 }
 179
 180 void
 181 sum_fini(sum_t *cs)
 182 {
 183         SHA256Result(&cs->sha, cs->out);
 184 }
 185
 186 void
 187 sum_add(sum_t *cs, void *buf, int size)
 188 {
 189         SHA256Input(&cs->sha, buf, size);
 190 }
 191
 192 void
 193 sum_add_sum(sum_t *dst, sum_t *src)
 194 {
 195         sum_add(dst, src->out, sizeof(src->out));
 196 }
 197
 198 void
 199 sum_add_u64(sum_t *dst, uint64_t val)
 200 {
 201         uint64_t v = cpu_to_le64(val);
 202         sum_add(dst, &v, sizeof(v));
 203 }
 204
 205 void
 206 sum_add_time(sum_t *dst, time_t t)
 207 {
 208         sum_add_u64(dst, t);
 209 }
 210
 211 char *
 212 sum_to_string(sum_t *dst)
 213 {
 214         int i;
 215         char *s = alloc(CS_SIZE * 2 + 1);
 216
 217         for (i = 0; i < CS_SIZE; ++i)
 218                 sprintf(s + i * 2, "%02x", dst->out[i]);
 219
 220         return s;
 221 }
 222
 223 int
 224 sum_file_data_permissive(int fd, sum_t *dst)
 225 {
 226         int ret;
 227         off_t pos;
 228         off_t old;
 229         int i;
 230         uint64_t zeros = 0;
 231
 232         pos = lseek(fd, 0, SEEK_CUR);
 233         if (pos == (off_t)-1)
 234                 return errno == ENXIO ? 0 : -2;
 235
 236         while (1) {
 237                 old = pos;
 238                 pos = lseek(fd, pos, SEEK_DATA);
 239                 if (pos == (off_t)-1) {
 240                         if (errno == ENXIO) {
 241                                 ret = 0;
 242                                 pos = lseek(fd, 0, SEEK_END);
 243                                 if (pos != (off_t)-1)
 244                                         zeros += pos - old;
 245                         } else {
 246                                 ret = -2;
 247                         }
 248                         break;
 249                 }
 250                 ret = read(fd, buf, sizeof(buf));
 251                 assert(ret); /* eof found by lseek */
 252                 if (ret <= 0)
 253                         break;
 254                 if (old < pos) /* hole */
 255                         zeros += pos - old;
 256                 for (i = 0; i < ret; ++i) {
 257                         for (old = i; buf[i] == 0 && i < ret; ++i)
 258                                 ;
 259                         if (old < i) /* code like a hole */
 260                                 zeros += i - old;
 261                         if (i == ret)
 262                                 break;
 263                         if (zeros) {
 264                                 if (verbose >= 2)
 265                                         fprintf(stderr,
 266                                                 "adding %llu zeros to sum\n",
 267                                                 (unsigned long long)zeros);
 268                                 sum_add_u64(dst, 0);
 269                                 sum_add_u64(dst, zeros);
 270                                 zeros = 0;
 271                         }
 272                         for (old = i; buf[i] != 0 && i < ret; ++i)
 273                                 ;
 274                         if (verbose >= 2)
 275                                 fprintf(stderr, "adding %u non-zeros to sum\n",
 276                                         i - (int)old);
 277                         sum_add(dst, buf + old, i - old);
 278                 }
 279                 pos += ret;
 280         }
 281
 282         if (zeros) {
 283                 if (verbose >= 2)
 284                         fprintf(stderr,
 285                                 "adding %llu zeros to sum (finishing)\n",
 286                                 (unsigned long long)zeros);
 287                 sum_add_u64(dst, 0);
 288                 sum_add_u64(dst, zeros);
 289         }
 290
 291         return ret;
 292 }
 293
 294 int
 295 sum_file_data_strict(int fd, sum_t *dst)
 296 {
 297         int ret;
 298         off_t pos;
 299
 300         pos = lseek(fd, 0, SEEK_CUR);
 301         if (pos == (off_t)-1)
 302                 return errno == ENXIO ? 0 : -2;
 303
 304         while (1) {
 305                 pos = lseek(fd, pos, SEEK_DATA);
 306                 if (pos == (off_t)-1)
 307                         return errno == ENXIO ? 0 : -2;
 308                 ret = read(fd, buf, sizeof(buf));
 309                 assert(ret); /* eof found by lseek */
 310                 if (ret <= 0)
 311                         return ret;
 312                 if (verbose >= 2)
 313                         fprintf(stderr,
 314                                 "adding to sum at file offset %llu, %d bytes\n",
 315                                 (unsigned long long)pos, ret);
 316                 sum_add_u64(dst, (uint64_t)pos);
 317                 sum_add(dst, buf, ret);
 318                 pos += ret;
 319         }
 320 }
 321
 322 char *
 323 escape(char *in)
 324 {
 325         char *out = alloc(strlen(in) * 3 + 1);
 326         char *src = in;
 327         char *dst = out;
 328
 329         for (; *src; ++src) {
 330                 if (*src >= 32 && *src < 127 && *src != '\\') {
 331                         *dst++ = *src;
 332                 } else {
 333                         sprintf(dst, "\\%02x", (unsigned char)*src);
 334                         dst += 3;
 335                 }
 336         }
 337         *dst = 0;
 338
 339         return out;
 340 }
 341
 342 void
 343 excess_file(const char *fn)
 344 {
 345         printf("only in local fs: %s\n", fn);
 346 }
 347
 348 void
 349 missing_file(const char *fn)
 350 {
 351         printf("only in remote fs: %s\n", fn);
 352 }
 353
 354 int
 355 pathcmp(const char *a, const char *b)
 356 {
 357         int len_a = strlen(a);
 358         int len_b = strlen(b);
 359
 360         /*
 361          * as the containing directory is sent after the files, it has to
 362          * come out bigger in the comparison.
 363          */
 364         if (len_a < len_b && a[len_a - 1] == '/' && strncmp(a, b, len_a) == 0)
 365                 return 1;
 366         if (len_a > len_b && b[len_b - 1] == '/' && strncmp(a, b, len_b) == 0)
 367                 return -1;
 368
 369         return strcmp(a, b);
 370 }
 371
 372 void
 373 check_match(char *fn, char *local_m, char *remote_m,
 374             char *local_c, char *remote_c)
 375 {
 376         int match_m = !strcmp(local_m, remote_m);
 377         int match_c = !strcmp(local_c, remote_c);
 378
 379         if (match_m && !match_c) {
 380                 printf("data mismatch in %s\n", fn);
 381         } else if (!match_m && match_c) {
 382                 printf("metadata mismatch in %s\n", fn);
 383         } else if (!match_m && !match_c) {
 384                 printf("metadata and data mismatch in %s\n", fn);
 385         }
 386 }
 387
 388 char *prev_fn;
 389 char *prev_m;
 390 char *prev_c;
 391 void
 392 check_manifest(char *fn, char *m, char *c, int last_call)
 393 {
 394         char *rem_m;
 395         char *rem_c;
 396         char *l;
 397         int cmp;
 398
 399         if (prev_fn) {
 400                 if (last_call)
 401                         cmp = -1;
 402                 else
 403                         cmp = pathcmp(prev_fn, fn);
 404                 if (cmp > 0) {
 405                         excess_file(fn);
 406                         return;
 407                 } else if (cmp < 0) {
 408                         missing_file(prev_fn);
 409                 } else {
 410                         check_match(fn, m, prev_m, c, prev_c);
 411                 }
 412                 free(prev_fn);
 413                 free(prev_m);
 414                 free(prev_c);
 415                 prev_fn = NULL;
 416                 prev_m = NULL;
 417                 prev_c = NULL;
 418                 if (cmp == 0)
 419                         return;
 420         }
 421         while ((l = getln(line, sizeof(line), in_fp))) {
 422                 rem_c = strrchr(l, ' ');
 423                 if (!rem_c) {
 424                         if (checksum)
 425                                 free(checksum);
 426
 427                         /* final cs */
 428                         checksum = strdup(l);
 429                         break;
 430                 }
 431                 if (rem_c == l) {
 432 malformed:
 433                         fprintf(stderr, "malformed input\n");
 434                         exit(-1);
 435                 }
 436                 *rem_c++ = 0;
 437                 rem_m = strrchr(l, ' ');
 438                 if (!rem_m)
 439                         goto malformed;
 440                 *rem_m++ = 0;
 441
 442                 if (last_call)
 443                         cmp = -1;
 444                 else
 445                         cmp = pathcmp(l, fn);
 446                 if (cmp == 0) {
 447                         check_match(fn, m, rem_m, c, rem_c);
 448                         return;
 449                 } else if (cmp > 0) {
 450                         excess_file(fn);
 451                         prev_fn = strdup(l);
 452                         prev_m = strdup(rem_m);
 453                         prev_c = strdup(rem_c);
 454                         return;
 455                 }
 456                 missing_file(l);
 457         }
 458         if (!last_call)
 459                 excess_file(fn);
 460 }
 461
 462 int
 463 namecmp(const void *aa, const void *bb)
 464 {
 465         char * const *a = aa;
 466         char * const *b = bb;
 467
 468         return strcmp(*a, *b);
 469 }
 470
 471 void
 472 sum(int dirfd, int level, sum_t *dircs, char *path_prefix, char *path_in)
 473 {
 474         DIR *d;
 475         struct dirent *de;
 476         char **namelist = NULL;
 477         int alloclen = 0;
 478         int entries = 0;
 479         int i;
 480         int ret;
 481         int fd;
 482         int excl;
 483         sum_file_data_t sum_file_data = flags[FLAG_STRUCTURE] ?
 484                         sum_file_data_strict : sum_file_data_permissive;
 485
 486         d = fdopendir(dirfd);
 487         if (!d) {
 488                 perror("opendir");
 489                 exit(-1);
 490         }
 491         while((de = readdir(d))) {
 492                 if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
 493                         continue;
 494                 if (entries == alloclen) {
 495                         alloclen += CHUNKS;
 496                         namelist = realloc(namelist,
 497                                            alloclen * sizeof(*namelist));
 498                         if (!namelist) {
 499                                 fprintf(stderr, "malloc failed\n");
 500                                 exit(-1);
 501                         }
 502                 }
 503                 namelist[entries] = strdup(de->d_name);
 504                 if (!namelist[entries]) {
 505                         fprintf(stderr, "malloc failed\n");
 506                         exit(-1);
 507                 }
 508                 ++entries;
 509         }
 510
 511         qsort(namelist, entries, sizeof(*namelist), namecmp);
 512         for (i = 0; i < entries; ++i) {
 513                 struct stat64 st;
 514                 sum_t cs;
 515                 sum_t meta;
 516                 char *path;
 517
 518                 sum_init(&cs);
 519                 sum_init(&meta);
 520                 path = alloc(strlen(path_in) + strlen(namelist[i]) + 3);
 521                 sprintf(path, "%s/%s", path_in, namelist[i]);
 522                 for (excl = 0; excl < n_excludes; ++excl) {
 523                         if (strncmp(excludes[excl].path, path,
 524                             excludes[excl].len) == 0)
 525                                 goto next;
 526                 }
 527
 528                 ret = fchdir(dirfd);
 529                 if (ret == -1) {
 530                         perror("fchdir");
 531                         exit(-1);
 532                 }
 533                 ret = lstat64(namelist[i], &st);
 534                 if (ret) {
 535                         fprintf(stderr, "stat failed for %s/%s: %s\n",
 536                                 path_prefix, path, strerror(errno));
 537                         exit(-1);
 538                 }
 539                 sum_add_u64(&meta, level);
 540                 sum_add(&meta, namelist[i], strlen(namelist[i]));
 541                 if (!S_ISDIR(st.st_mode))
 542                         sum_add_u64(&meta, st.st_nlink);
 543                 if (flags[FLAG_UID])
 544                         sum_add_u64(&meta, st.st_uid);
 545                 if (flags[FLAG_GID])
 546                         sum_add_u64(&meta, st.st_gid);
 547                 if (flags[FLAG_MODE])
 548                         sum_add_u64(&meta, st.st_mode);
 549                 if (flags[FLAG_ATIME])
 550                         sum_add_time(&meta, st.st_atime);
 551                 if (flags[FLAG_MTIME])
 552                         sum_add_time(&meta, st.st_mtime);
 553                 if (flags[FLAG_CTIME])
 554                         sum_add_time(&meta, st.st_ctime);
 555                 if (S_ISDIR(st.st_mode)) {
 556                         fd = openat(dirfd, namelist[i], 0);
 557                         if (fd == -1 && flags[FLAG_OPEN_ERROR]) {
 558                                 sum_add_u64(&meta, errno);
 559                         } else if (fd == -1) {
 560                                 fprintf(stderr, "open failed for %s/%s: %s\n",
 561                                         path_prefix, path, strerror(errno));
 562                                 exit(-1);
 563                         } else {
 564                                 sum(fd, level + 1, &cs, path_prefix, path);
 565                                 close(fd);
 566                         }
 567                 } else if (S_ISREG(st.st_mode)) {
 568                         sum_add_u64(&meta, st.st_size);
 569                         if (flags[FLAG_DATA]) {
 570                                 if (verbose)
 571                                         fprintf(stderr, "file %s\n",
 572                                                 namelist[i]);
 573                                 fd = openat(dirfd, namelist[i], 0);
 574                                 if (fd == -1 && flags[FLAG_OPEN_ERROR]) {
 575                                         sum_add_u64(&meta, errno);
 576                                 } else if (fd == -1) {
 577                                         fprintf(stderr,
 578                                                 "open failed for %s/%s: %s\n",
 579                                                 path_prefix, path,
 580                                                 strerror(errno));
 581                                         exit(-1);
 582                                 }
 583                                 if (fd != -1) {
 584                                         ret = sum_file_data(fd, &cs);
 585                                         if (ret < 0) {
 586                                                 fprintf(stderr,
 587                                                         "read failed for "
 588                                                         "%s/%s: %s\n",
 589                                                         path_prefix, path,
 590                                                         strerror(errno));
 591                                                 exit(-1);
 592                                         }
 593                                         close(fd);
 594                                 }
 595                         }
 596                 } else if (S_ISLNK(st.st_mode)) {
 597                         ret = readlink(namelist[i], buf, sizeof(buf));
 598                         if (ret == -1) {
 599                                 perror("readlink");
 600                                 exit(-1);
 601                         }
 602                         sum_add(&cs, buf, ret);
 603                 } else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
 604                         sum_add_u64(&cs, major(st.st_rdev));
 605                         sum_add_u64(&cs, minor(st.st_rdev));
 606                 }
 607                 sum_fini(&cs);
 608                 sum_fini(&meta);
 609                 if (gen_manifest || in_manifest) {
 610                         char *fn;
 611                         char *m;
 612                         char *c;
 613
 614                         if (S_ISDIR(st.st_mode))
 615                                 strcat(path, "/");
 616                         fn = escape(path);
 617                         m = sum_to_string(&meta);
 618                         c = sum_to_string(&cs);
 619
 620                         if (gen_manifest)
 621                                 fprintf(out_fp, "%s %s %s\n", fn, m, c);
 622                         if (in_manifest)
 623                                 check_manifest(fn, m, c, 0);
 624                         free(c);
 625                         free(m);
 626                         free(fn);
 627                 }
 628                 sum_add_sum(dircs, &cs);
 629                 sum_add_sum(dircs, &meta);
 630 next:
 631                 free(path);
 632                 free(namelist[i]);
 633         }
 634
 635         free(namelist);
 636         closedir(d);
 637 }
 638
 639 int
 640 main(int argc, char *argv[])
 641 {
 642         extern char *optarg;
 643         extern int optind;
 644         int     c;
 645         char *path;
 646         int fd;
 647         sum_t cs;
 648         char *sumstring;
 649         char flagstring[sizeof(flchar)];
 650         int ret = 0;
 651         int i;
 652         int plen;
 653         int elen;
 654         int n_flags = 0;
 655         const char *allopts = "heEfuUgGoOaAmMcCdDsSnNw:r:vx:";
 656
 657         out_fp = stdout;
 658         while ((c = getopt(argc, argv, allopts)) != EOF) {
 659                 switch(c) {
 660                 case 'f':
 661                         gen_manifest = 1;
 662                         break;
 663                 case 'u':
 664                 case 'U':
 665                 case 'g':
 666                 case 'G':
 667                 case 'o':
 668                 case 'O':
 669                 case 'a':
 670                 case 'A':
 671                 case 'm':
 672                 case 'M':
 673                 case 'c':
 674                 case 'C':
 675                 case 'd':
 676                 case 'D':
 677                 case 'e':
 678                 case 'E':
 679                 case 's':
 680                 case 'S':
 681                         ++n_flags;
 682                         parse_flag(c);
 683                         break;
 684                 case 'n':
 685                         for (i = 0; i < NUM_FLAGS; ++i)
 686                                 flags[i] = 0;
 687                         break;
 688                 case 'N':
 689                         for (i = 0; i < NUM_FLAGS; ++i)
 690                                 flags[i] = 1;
 691                         break;
 692                 case 'w':
 693                         out_fp = fopen(optarg, "w");
 694                         if (!out_fp) {
 695                                 fprintf(stderr,
 696                                         "failed to open output file: %s\n",
 697                                         strerror(errno));
 698                                 exit(-1);
 699                         }
 700                         break;
 701                 case 'r':
 702                         in_fp = fopen(optarg, "r");
 703                         if (!in_fp) {
 704                                 fprintf(stderr,
 705                                         "failed to open input file: %s\n",
 706                                         strerror(errno));
 707                                 exit(-1);
 708                         }
 709                         break;
 710                 case 'x':
 711                         ++n_excludes;
 712                         excludes = realloc(excludes,
 713                                            sizeof(*excludes) * n_excludes);
 714                         if (!excludes) {
 715                                 fprintf(stderr,
 716                                         "failed to alloc exclude space\n");
 717                                 exit(-1);
 718                         }
 719                         excludes[n_excludes - 1].path = optarg;
 720                         break;
 721                 case 'v':
 722                         ++verbose;
 723                         break;
 724                 case 'h':
 725                 case '?':
 726                         usage();
 727                 }
 728         }
 729
 730         if (optind + 1 != argc) {
 731                 fprintf(stderr, "missing path\n");
 732                 usage();
 733         }
 734
 735         if (in_fp) {
 736                 char *l = getln(line, sizeof(line), in_fp);
 737                 char *p;
 738
 739                 if (l == NULL) {
 740                         fprintf(stderr, "failed to read line from input\n");
 741                         exit(-1);
 742                 }
 743                 if (strncmp(l, "Flags: ", 7) == 0) {
 744                         l += 7;
 745                         in_manifest = 1;
 746                         parse_flags(l);
 747                 } else if ((p = strchr(l, ':'))) {
 748                         *p++ = 0;
 749                         parse_flags(l);
 750
 751                         if (checksum)
 752                                 free(checksum);
 753                         checksum = strdup(p);
 754                 } else {
 755                         fprintf(stderr, "invalid input file format\n");
 756                         exit(-1);
 757                 }
 758                 if (n_flags)
 759                         fprintf(stderr, "warning: "
 760                                 "command line flags ignored in -r mode\n");
 761         }
 762         strcpy(flagstring, flchar);
 763         for (i = 0; i < NUM_FLAGS; ++i) {
 764                 if (flags[i] == 0)
 765                         flagstring[i] -= 'a' - 'A';
 766         }
 767
 768         path = argv[optind];
 769         plen = strlen(path);
 770         if (path[plen - 1] == '/') {
 771                 --plen;
 772                 path[plen] = '\0';
 773         }
 774
 775         for (i = 0; i < n_excludes; ++i) {
 776                 if (strncmp(path, excludes[i].path, plen) != 0)
 777                         fprintf(stderr,
 778                                 "warning: exclude %s outside of path %s\n",
 779                                 excludes[i].path, path);
 780                 else
 781                         excludes[i].path += plen;
 782                 elen = strlen(excludes[i].path);
 783                 if (excludes[i].path[elen - 1] == '/')
 784                         --elen;
 785                 excludes[i].path[elen] = '\0';
 786                 excludes[i].len = elen;
 787         }
 788
 789         fd = open(path, O_RDONLY);
 790         if (fd == -1) {
 791                 fprintf(stderr, "failed to open %s: %s\n", path,
 792                         strerror(errno));
 793                 exit(-1);
 794         }
 795
 796         if (gen_manifest)
 797                 fprintf(out_fp, "Flags: %s\n", flagstring);
 798
 799         sum_init(&cs);
 800         sum(fd, 1, &cs, path, "");
 801         sum_fini(&cs);
 802
 803         close(fd);
 804         if (in_manifest)
 805                 check_manifest("", "", "", 1);
 806
 807         if (!checksum) {
 808                 if (in_manifest) {
 809                         fprintf(stderr, "malformed input\n");
 810                         exit(-1);
 811                 }
 812                 if (!gen_manifest)
 813                         fprintf(out_fp, "%s:", flagstring);
 814
 815                 sumstring = sum_to_string(&cs);
 816                 fprintf(out_fp, "%s\n", sumstring);
 817                 free(sumstring);
 818         } else {
 819                 sumstring = sum_to_string(&cs);
 820                 if (strcmp(checksum, sumstring) == 0) {
 821                         printf("OK\n");
 822                         ret = 0;
 823                 } else {
 824                         printf("FAIL\n");
 825                         ret = 1;
 826                 }
 827
 828                 free(checksum);
 829                 free(sumstring);
 830         }
 831
 832         if (in_fp)
 833                 fclose(in_fp);
 834
 835         if (out_fp != stdout)
 836                 fclose(out_fp);
 837
 838         exit(ret);
 839 }