convert.c

   1 #include "cache.h"
   2 #include "attr.h"
   3 #include "run-command.h"
   4
   5 /*
   6  * convert.c - convert a file when checking it out and checking it in.
   7  *
   8  * This should use the pathname to decide on whether it wants to do some
   9  * more interesting conversions (automatic gzip/unzip, general format
  10  * conversions etc etc), but by default it just does automatic CRLF<->LF
  11  * translation when the "text" attribute or "auto_crlf" option is set.
  12  */
  13
  14 enum action {
  15         CRLF_GUESS = -1,
  16         CRLF_BINARY = 0,
  17         CRLF_TEXT,
  18         CRLF_INPUT,
  19         CRLF_CRLF,
  20         CRLF_AUTO,
  21 };
  22
  23 struct text_stat {
  24         /* NUL, CR, LF and CRLF counts */
  25         unsigned nul, cr, lf, crlf;
  26
  27         /* These are just approximations! */
  28         unsigned printable, nonprintable;
  29 };
  30
  31 static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats)
  32 {
  33         unsigned long i;
  34
  35         memset(stats, 0, sizeof(*stats));
  36
  37         for (i = 0; i < size; i++) {
  38                 unsigned char c = buf[i];
  39                 if (c == '\r') {
  40                         stats->cr++;
  41                         if (i+1 < size && buf[i+1] == '\n')
  42                                 stats->crlf++;
  43                         continue;
  44                 }
  45                 if (c == '\n') {
  46                         stats->lf++;
  47                         continue;
  48                 }
  49                 if (c == 127)
  50                         /* DEL */
  51                         stats->nonprintable++;
  52                 else if (c < 32) {
  53                         switch (c) {
  54                                 /* BS, HT, ESC and FF */
  55                         case '\b': case '\t': case '\033': case '\014':
  56                                 stats->printable++;
  57                                 break;
  58                         case 0:
  59                                 stats->nul++;
  60                                 /* fall through */
  61                         default:
  62                                 stats->nonprintable++;
  63                         }
  64                 }
  65                 else
  66                         stats->printable++;
  67         }
  68
  69         /* If file ends with EOF then don't count this EOF as non-printable. */
  70         if (size >= 1 && buf[size-1] == '\032')
  71                 stats->nonprintable--;
  72 }
  73
  74 /*
  75  * The same heuristics as diff.c::mmfile_is_binary()
  76  */
  77 static int is_binary(unsigned long size, struct text_stat *stats)
  78 {
  79
  80         if (stats->nul)
  81                 return 1;
  82         if ((stats->printable >> 7) < stats->nonprintable)
  83                 return 1;
  84         /*
  85          * Other heuristics? Average line length might be relevant,
  86          * as might LF vs CR vs CRLF counts..
  87          *
  88          * NOTE! It might be normal to have a low ratio of CRLF to LF
  89          * (somebody starts with a LF-only file and edits it with an editor
  90          * that adds CRLF only to lines that are added..). But do  we
  91          * want to support CR-only? Probably not.
  92          */
  93         return 0;
  94 }
  95
  96 static enum eol determine_output_conversion(enum action action) {
  97         switch (action) {
  98         case CRLF_BINARY:
  99                 return EOL_UNSET;
 100         case CRLF_CRLF:
 101                 return EOL_CRLF;
 102         case CRLF_INPUT:
 103                 return EOL_LF;
 104         case CRLF_GUESS:
 105                 if (!auto_crlf)
 106                         return EOL_UNSET;
 107                 /* fall through */
 108         case CRLF_TEXT:
 109         case CRLF_AUTO:
 110                 if (auto_crlf == AUTO_CRLF_TRUE)
 111                         return EOL_CRLF;
 112                 else if (auto_crlf == AUTO_CRLF_INPUT)
 113                         return EOL_LF;
 114                 else if (eol == EOL_UNSET)
 115                         return EOL_NATIVE;
 116         }
 117         return eol;
 118 }
 119
 120 static void check_safe_crlf(const char *path, enum action action,
 121                             struct text_stat *stats, enum safe_crlf checksafe)
 122 {
 123         if (!checksafe)
 124                 return;
 125
 126         if (determine_output_conversion(action) == EOL_LF) {
 127                 /*
 128                  * CRLFs would not be restored by checkout:
 129                  * check if we'd remove CRLFs
 130                  */
 131                 if (stats->crlf) {
 132                         if (checksafe == SAFE_CRLF_WARN)
 133                                 warning("CRLF will be replaced by LF in %s.\nThe file will have its original line endings in your working directory.", path);
 134                         else /* i.e. SAFE_CRLF_FAIL */
 135                                 die("CRLF would be replaced by LF in %s.", path);
 136                 }
 137         } else if (determine_output_conversion(action) == EOL_CRLF) {
 138                 /*
 139                  * CRLFs would be added by checkout:
 140                  * check if we have "naked" LFs
 141                  */
 142                 if (stats->lf != stats->crlf) {
 143                         if (checksafe == SAFE_CRLF_WARN)
 144                                 warning("LF will be replaced by CRLF in %s.\nThe file will have its original line endings in your working directory.", path);
 145                         else /* i.e. SAFE_CRLF_FAIL */
 146                                 die("LF would be replaced by CRLF in %s", path);
 147                 }
 148         }
 149 }
 150
 151 static int has_cr_in_index(const char *path)
 152 {
 153         int pos, len;
 154         unsigned long sz;
 155         enum object_type type;
 156         void *data;
 157         int has_cr;
 158         struct index_state *istate = &the_index;
 159
 160         len = strlen(path);
 161         pos = index_name_pos(istate, path, len);
 162         if (pos < 0) {
 163                 /*
 164                  * We might be in the middle of a merge, in which
 165                  * case we would read stage #2 (ours).
 166                  */
 167                 int i;
 168                 for (i = -pos - 1;
 169                      (pos < 0 && i < istate->cache_nr &&
 170                       !strcmp(istate->cache[i]->name, path));
 171                      i++)
 172                         if (ce_stage(istate->cache[i]) == 2)
 173                                 pos = i;
 174         }
 175         if (pos < 0)
 176                 return 0;
 177         data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
 178         if (!data || type != OBJ_BLOB) {
 179                 free(data);
 180                 return 0;
 181         }
 182
 183         has_cr = memchr(data, '\r', sz) != NULL;
 184         free(data);
 185         return has_cr;
 186 }
 187
 188 static int crlf_to_git(const char *path, const char *src, size_t len,
 189                        struct strbuf *buf, enum action action, enum safe_crlf checksafe)
 190 {
 191         struct text_stat stats;
 192         char *dst;
 193
 194         if (action == CRLF_BINARY ||
 195             (action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE) || !len)
 196                 return 0;
 197
 198         gather_stats(src, len, &stats);
 199
 200         if (action == CRLF_AUTO || action == CRLF_GUESS) {
 201                 /*
 202                  * We're currently not going to even try to convert stuff
 203                  * that has bare CR characters. Does anybody do that crazy
 204                  * stuff?
 205                  */
 206                 if (stats.cr != stats.crlf)
 207                         return 0;
 208
 209                 /*
 210                  * And add some heuristics for binary vs text, of course...
 211                  */
 212                 if (is_binary(len, &stats))
 213                         return 0;
 214
 215                 if (action == CRLF_GUESS) {
 216                         /*
 217                          * If the file in the index has any CR in it, do not convert.
 218                          * This is the new safer autocrlf handling.
 219                          */
 220                         if (has_cr_in_index(path))
 221                                 return 0;
 222                 }
 223         }
 224
 225         check_safe_crlf(path, action, &stats, checksafe);
 226
 227         /* Optimization: No CR? Nothing to convert, regardless. */
 228         if (!stats.cr)
 229                 return 0;
 230
 231         /* only grow if not in place */
 232         if (strbuf_avail(buf) + buf->len < len)
 233                 strbuf_grow(buf, len - buf->len);
 234         dst = buf->buf;
 235         if (action == CRLF_AUTO || action == CRLF_GUESS) {
 236                 /*
 237                  * If we guessed, we already know we rejected a file with
 238                  * lone CR, and we can strip a CR without looking at what
 239                  * follow it.
 240                  */
 241                 do {
 242                         unsigned char c = *src++;
 243                         if (c != '\r')
 244                                 *dst++ = c;
 245                 } while (--len);
 246         } else {
 247                 do {
 248                         unsigned char c = *src++;
 249                         if (! (c == '\r' && (1 < len && *src == '\n')))
 250                                 *dst++ = c;
 251                 } while (--len);
 252         }
 253         strbuf_setlen(buf, dst - buf->buf);
 254         return 1;
 255 }
 256
 257 static int crlf_to_worktree(const char *path, const char *src, size_t len,
 258                             struct strbuf *buf, enum action action)
 259 {
 260         char *to_free = NULL;
 261         struct text_stat stats;
 262
 263         if (!len || determine_output_conversion(action) != EOL_CRLF)
 264                 return 0;
 265
 266         gather_stats(src, len, &stats);
 267
 268         /* No LF? Nothing to convert, regardless. */
 269         if (!stats.lf)
 270                 return 0;
 271
 272         /* Was it already in CRLF format? */
 273         if (stats.lf == stats.crlf)
 274                 return 0;
 275
 276         if (action == CRLF_AUTO || action == CRLF_GUESS) {
 277                 if (action == CRLF_GUESS) {
 278                         /* If we have any CR or CRLF line endings, we do not touch it */
 279                         /* This is the new safer autocrlf-handling */
 280                         if (stats.cr > 0 || stats.crlf > 0)
 281                                 return 0;
 282                 }
 283
 284                 /* If we have any bare CR characters, we're not going to touch it */
 285                 if (stats.cr != stats.crlf)
 286                         return 0;
 287
 288                 if (is_binary(len, &stats))
 289                         return 0;
 290         }
 291
 292         /* are we "faking" in place editing ? */
 293         if (src == buf->buf)
 294                 to_free = strbuf_detach(buf, NULL);
 295
 296         strbuf_grow(buf, len + stats.lf - stats.crlf);
 297         for (;;) {
 298                 const char *nl = memchr(src, '\n', len);
 299                 if (!nl)
 300                         break;
 301                 if (nl > src && nl[-1] == '\r') {
 302                         strbuf_add(buf, src, nl + 1 - src);
 303                 } else {
 304                         strbuf_add(buf, src, nl - src);
 305                         strbuf_addstr(buf, "\r\n");
 306                 }
 307                 len -= nl + 1 - src;
 308                 src  = nl + 1;
 309         }
 310         strbuf_add(buf, src, len);
 311
 312         free(to_free);
 313         return 1;
 314 }
 315
 316 struct filter_params {
 317         const char *src;
 318         unsigned long size;
 319         const char *cmd;
 320 };
 321
 322 static int filter_buffer(int in, int out, void *data)
 323 {
 324         /*
 325          * Spawn cmd and feed the buffer contents through its stdin.
 326          */
 327         struct child_process child_process;
 328         struct filter_params *params = (struct filter_params *)data;
 329         int write_err, status;
 330         const char *argv[] = { NULL, NULL };
 331
 332         argv[0] = params->cmd;
 333
 334         memset(&child_process, 0, sizeof(child_process));
 335         child_process.argv = argv;
 336         child_process.use_shell = 1;
 337         child_process.in = -1;
 338         child_process.out = out;
 339
 340         if (start_command(&child_process))
 341                 return error("cannot fork to run external filter %s", params->cmd);
 342
 343         write_err = (write_in_full(child_process.in, params->src, params->size) < 0);
 344         if (close(child_process.in))
 345                 write_err = 1;
 346         if (write_err)
 347                 error("cannot feed the input to external filter %s", params->cmd);
 348
 349         status = finish_command(&child_process);
 350         if (status)
 351                 error("external filter %s failed %d", params->cmd, status);
 352         return (write_err || status);
 353 }
 354
 355 static int apply_filter(const char *path, const char *src, size_t len,
 356                         struct strbuf *dst, const char *cmd)
 357 {
 358         /*
 359          * Create a pipeline to have the command filter the buffer's
 360          * contents.
 361          *
 362          * (child --> cmd) --> us
 363          */
 364         int ret = 1;
 365         struct strbuf nbuf = STRBUF_INIT;
 366         struct async async;
 367         struct filter_params params;
 368
 369         if (!cmd)
 370                 return 0;
 371
 372         memset(&async, 0, sizeof(async));
 373         async.proc = filter_buffer;
 374         async.data = &params;
 375         async.out = -1;
 376         params.src = src;
 377         params.size = len;
 378         params.cmd = cmd;
 379
 380         fflush(NULL);
 381         if (start_async(&async))
 382                 return 0;       /* error was already reported */
 383
 384         if (strbuf_read(&nbuf, async.out, len) < 0) {
 385                 error("read from external filter %s failed", cmd);
 386                 ret = 0;
 387         }
 388         if (close(async.out)) {
 389                 error("read from external filter %s failed", cmd);
 390                 ret = 0;
 391         }
 392         if (finish_async(&async)) {
 393                 error("external filter %s failed", cmd);
 394                 ret = 0;
 395         }
 396
 397         if (ret) {
 398                 strbuf_swap(dst, &nbuf);
 399         }
 400         strbuf_release(&nbuf);
 401         return ret;
 402 }
 403
 404 static struct convert_driver {
 405         const char *name;
 406         struct convert_driver *next;
 407         const char *smudge;
 408         const char *clean;
 409 } *user_convert, **user_convert_tail;
 410
 411 static int read_convert_config(const char *var, const char *value, void *cb)
 412 {
 413         const char *ep, *name;
 414         int namelen;
 415         struct convert_driver *drv;
 416
 417         /*
 418          * External conversion drivers are configured using
 419          * "filter.<name>.variable".
 420          */
 421         if (prefixcmp(var, "filter.") || (ep = strrchr(var, '.')) == var + 6)
 422                 return 0;
 423         name = var + 7;
 424         namelen = ep - name;
 425         for (drv = user_convert; drv; drv = drv->next)
 426                 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
 427                         break;
 428         if (!drv) {
 429                 drv = xcalloc(1, sizeof(struct convert_driver));
 430                 drv->name = xmemdupz(name, namelen);
 431                 *user_convert_tail = drv;
 432                 user_convert_tail = &(drv->next);
 433         }
 434
 435         ep++;
 436
 437         /*
 438          * filter.<name>.smudge and filter.<name>.clean specifies
 439          * the command line:
 440          *
 441          *      command-line
 442          *
 443          * The command-line will not be interpolated in any way.
 444          */
 445
 446         if (!strcmp("smudge", ep))
 447                 return git_config_string(&drv->smudge, var, value);
 448
 449         if (!strcmp("clean", ep))
 450                 return git_config_string(&drv->clean, var, value);
 451
 452         return 0;
 453 }
 454
 455 static void setup_convert_check(struct git_attr_check *check)
 456 {
 457         static struct git_attr *attr_text;
 458         static struct git_attr *attr_crlf;
 459         static struct git_attr *attr_eol;
 460         static struct git_attr *attr_ident;
 461         static struct git_attr *attr_filter;
 462
 463         if (!attr_text) {
 464                 attr_text = git_attr("text");
 465                 attr_crlf = git_attr("crlf");
 466                 attr_eol = git_attr("eol");
 467                 attr_ident = git_attr("ident");
 468                 attr_filter = git_attr("filter");
 469                 user_convert_tail = &user_convert;
 470                 git_config(read_convert_config, NULL);
 471         }
 472         check[0].attr = attr_crlf;
 473         check[1].attr = attr_ident;
 474         check[2].attr = attr_filter;
 475         check[3].attr = attr_eol;
 476         check[4].attr = attr_text;
 477 }
 478
 479 static int count_ident(const char *cp, unsigned long size)
 480 {
 481         /*
 482          * "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$"
 483          */
 484         int cnt = 0;
 485         char ch;
 486
 487         while (size) {
 488                 ch = *cp++;
 489                 size--;
 490                 if (ch != '$')
 491                         continue;
 492                 if (size < 3)
 493                         break;
 494                 if (memcmp("Id", cp, 2))
 495                         continue;
 496                 ch = cp[2];
 497                 cp += 3;
 498                 size -= 3;
 499                 if (ch == '$')
 500                         cnt++; /* $Id$ */
 501                 if (ch != ':')
 502                         continue;
 503
 504                 /*
 505                  * "$Id: ... "; scan up to the closing dollar sign and discard.
 506                  */
 507                 while (size) {
 508                         ch = *cp++;
 509                         size--;
 510                         if (ch == '$') {
 511                                 cnt++;
 512                                 break;
 513                         }
 514                         if (ch == '\n')
 515                                 break;
 516                 }
 517         }
 518         return cnt;
 519 }
 520
 521 static int ident_to_git(const char *path, const char *src, size_t len,
 522                         struct strbuf *buf, int ident)
 523 {
 524         char *dst, *dollar;
 525
 526         if (!ident || !count_ident(src, len))
 527                 return 0;
 528
 529         /* only grow if not in place */
 530         if (strbuf_avail(buf) + buf->len < len)
 531                 strbuf_grow(buf, len - buf->len);
 532         dst = buf->buf;
 533         for (;;) {
 534                 dollar = memchr(src, '$', len);
 535                 if (!dollar)
 536                         break;
 537                 memcpy(dst, src, dollar + 1 - src);
 538                 dst += dollar + 1 - src;
 539                 len -= dollar + 1 - src;
 540                 src  = dollar + 1;
 541
 542                 if (len > 3 && !memcmp(src, "Id:", 3)) {
 543                         dollar = memchr(src + 3, '$', len - 3);
 544                         if (!dollar)
 545                                 break;
 546                         if (memchr(src + 3, '\n', dollar - src - 3)) {
 547                                 /* Line break before the next dollar. */
 548                                 continue;
 549                         }
 550
 551                         memcpy(dst, "Id$", 3);
 552                         dst += 3;
 553                         len -= dollar + 1 - src;
 554                         src  = dollar + 1;
 555                 }
 556         }
 557         memcpy(dst, src, len);
 558         strbuf_setlen(buf, dst + len - buf->buf);
 559         return 1;
 560 }
 561
 562 static int ident_to_worktree(const char *path, const char *src, size_t len,
 563                              struct strbuf *buf, int ident)
 564 {
 565         unsigned char sha1[20];
 566         char *to_free = NULL, *dollar, *spc;
 567         int cnt;
 568
 569         if (!ident)
 570                 return 0;
 571
 572         cnt = count_ident(src, len);
 573         if (!cnt)
 574                 return 0;
 575
 576         /* are we "faking" in place editing ? */
 577         if (src == buf->buf)
 578                 to_free = strbuf_detach(buf, NULL);
 579         hash_sha1_file(src, len, "blob", sha1);
 580
 581         strbuf_grow(buf, len + cnt * 43);
 582         for (;;) {
 583                 /* step 1: run to the next '$' */
 584                 dollar = memchr(src, '$', len);
 585                 if (!dollar)
 586                         break;
 587                 strbuf_add(buf, src, dollar + 1 - src);
 588                 len -= dollar + 1 - src;
 589                 src  = dollar + 1;
 590
 591                 /* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */
 592                 if (len < 3 || memcmp("Id", src, 2))
 593                         continue;
 594
 595                 /* step 3: skip over Id$ or Id:xxxxx$ */
 596                 if (src[2] == '$') {
 597                         src += 3;
 598                         len -= 3;
 599                 } else if (src[2] == ':') {
 600                         /*
 601                          * It's possible that an expanded Id has crept its way into the
 602                          * repository, we cope with that by stripping the expansion out.
 603                          * This is probably not a good idea, since it will cause changes
 604                          * on checkout, which won't go away by stash, but let's keep it
 605                          * for git-style ids.
 606                          */
 607                         dollar = memchr(src + 3, '$', len - 3);
 608                         if (!dollar) {
 609                                 /* incomplete keyword, no more '$', so just quit the loop */
 610                                 break;
 611                         }
 612
 613                         if (memchr(src + 3, '\n', dollar - src - 3)) {
 614                                 /* Line break before the next dollar. */
 615                                 continue;
 616                         }
 617
 618                         spc = memchr(src + 4, ' ', dollar - src - 4);
 619                         if (spc && spc < dollar-1) {
 620                                 /* There are spaces in unexpected places.
 621                                  * This is probably an id from some other
 622                                  * versioning system. Keep it for now.
 623                                  */
 624                                 continue;
 625                         }
 626
 627                         len -= dollar + 1 - src;
 628                         src  = dollar + 1;
 629                 } else {
 630                         /* it wasn't a "Id$" or "Id:xxxx$" */
 631                         continue;
 632                 }
 633
 634                 /* step 4: substitute */
 635                 strbuf_addstr(buf, "Id: ");
 636                 strbuf_add(buf, sha1_to_hex(sha1), 40);
 637                 strbuf_addstr(buf, " $");
 638         }
 639         strbuf_add(buf, src, len);
 640
 641         free(to_free);
 642         return 1;
 643 }
 644
 645 static int git_path_check_crlf(const char *path, struct git_attr_check *check)
 646 {
 647         const char *value = check->value;
 648
 649         if (ATTR_TRUE(value))
 650                 return CRLF_TEXT;
 651         else if (ATTR_FALSE(value))
 652                 return CRLF_BINARY;
 653         else if (ATTR_UNSET(value))
 654                 ;
 655         else if (!strcmp(value, "input"))
 656                 return CRLF_INPUT;
 657         else if (!strcmp(value, "auto"))
 658                 return CRLF_AUTO;
 659         return CRLF_GUESS;
 660 }
 661
 662 static int git_path_check_eol(const char *path, struct git_attr_check *check)
 663 {
 664         const char *value = check->value;
 665
 666         if (ATTR_UNSET(value))
 667                 ;
 668         else if (!strcmp(value, "lf"))
 669                 return EOL_LF;
 670         else if (!strcmp(value, "crlf"))
 671                 return EOL_CRLF;
 672         return EOL_UNSET;
 673 }
 674
 675 static struct convert_driver *git_path_check_convert(const char *path,
 676                                              struct git_attr_check *check)
 677 {
 678         const char *value = check->value;
 679         struct convert_driver *drv;
 680
 681         if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
 682                 return NULL;
 683         for (drv = user_convert; drv; drv = drv->next)
 684                 if (!strcmp(value, drv->name))
 685                         return drv;
 686         return NULL;
 687 }
 688
 689 static int git_path_check_ident(const char *path, struct git_attr_check *check)
 690 {
 691         const char *value = check->value;
 692
 693         return !!ATTR_TRUE(value);
 694 }
 695
 696 enum action determine_action(enum action text_attr, enum eol eol_attr) {
 697         if (text_attr == CRLF_BINARY)
 698                 return CRLF_BINARY;
 699         if (eol_attr == EOL_LF)
 700                 return CRLF_INPUT;
 701         if (eol_attr == EOL_CRLF)
 702                 return CRLF_CRLF;
 703         return text_attr;
 704 }
 705
 706 int convert_to_git(const char *path, const char *src, size_t len,
 707                    struct strbuf *dst, enum safe_crlf checksafe)
 708 {
 709         struct git_attr_check check[5];
 710         enum action action = CRLF_GUESS;
 711         enum eol eol_attr = EOL_UNSET;
 712         int ident = 0, ret = 0;
 713         const char *filter = NULL;
 714
 715         setup_convert_check(check);
 716         if (!git_checkattr(path, ARRAY_SIZE(check), check)) {
 717                 struct convert_driver *drv;
 718                 action = git_path_check_crlf(path, check + 4);
 719                 if (action == CRLF_GUESS)
 720                         action = git_path_check_crlf(path, check + 0);
 721                 ident = git_path_check_ident(path, check + 1);
 722                 drv = git_path_check_convert(path, check + 2);
 723                 eol_attr = git_path_check_eol(path, check + 3);
 724                 if (drv && drv->clean)
 725                         filter = drv->clean;
 726         }
 727
 728         ret |= apply_filter(path, src, len, dst, filter);
 729         if (ret) {
 730                 src = dst->buf;
 731                 len = dst->len;
 732         }
 733         action = determine_action(action, eol_attr);
 734         ret |= crlf_to_git(path, src, len, dst, action, checksafe);
 735         if (ret) {
 736                 src = dst->buf;
 737                 len = dst->len;
 738         }
 739         return ret | ident_to_git(path, src, len, dst, ident);
 740 }
 741
 742 int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst)
 743 {
 744         struct git_attr_check check[5];
 745         enum action action = CRLF_GUESS;
 746         enum eol eol_attr = EOL_UNSET;
 747         int ident = 0, ret = 0;
 748         const char *filter = NULL;
 749
 750         setup_convert_check(check);
 751         if (!git_checkattr(path, ARRAY_SIZE(check), check)) {
 752                 struct convert_driver *drv;
 753                 action = git_path_check_crlf(path, check + 4);
 754                 if (action == CRLF_GUESS)
 755                         action = git_path_check_crlf(path, check + 0);
 756                 ident = git_path_check_ident(path, check + 1);
 757                 drv = git_path_check_convert(path, check + 2);
 758                 eol_attr = git_path_check_eol(path, check + 3);
 759                 if (drv && drv->smudge)
 760                         filter = drv->smudge;
 761         }
 762
 763         ret |= ident_to_worktree(path, src, len, dst, ident);
 764         if (ret) {
 765                 src = dst->buf;
 766                 len = dst->len;
 767         }
 768         action = determine_action(action, eol_attr);
 769         ret |= crlf_to_worktree(path, src, len, dst, action);
 770         if (ret) {
 771                 src = dst->buf;
 772                 len = dst->len;
 773         }
 774         return ret | apply_filter(path, src, len, dst, filter);
 775 }