ls-files.c

   1 /*
   2  * This merges the file listing in the directory cache index
   3  * with the actual working directory list, and shows different
   4  * combinations of the two.
   5  *
   6  * Copyright (C) Linus Torvalds, 2005
   7  */
   8 #include <dirent.h>
   9 #include <fnmatch.h>
  10
  11 #include "cache.h"
  12 #include "quote.h"
  13
  14 static int show_deleted = 0;
  15 static int show_cached = 0;
  16 static int show_others = 0;
  17 static int show_ignored = 0;
  18 static int show_stage = 0;
  19 static int show_unmerged = 0;
  20 static int show_modified = 0;
  21 static int show_killed = 0;
  22 static int line_terminator = '\n';
  23
  24 static int prefix_len = 0, prefix_offset = 0;
  25 static const char *prefix = NULL;
  26 static const char **pathspec = NULL;
  27
  28 static const char *tag_cached = "";
  29 static const char *tag_unmerged = "";
  30 static const char *tag_removed = "";
  31 static const char *tag_other = "";
  32 static const char *tag_killed = "";
  33 static const char *tag_modified = "";
  34
  35 static const char *exclude_per_dir = NULL;
  36
  37 /* We maintain three exclude pattern lists:
  38  * EXC_CMDL lists patterns explicitly given on the command line.
  39  * EXC_DIRS lists patterns obtained from per-directory ignore files.
  40  * EXC_FILE lists patterns from fallback ignore files.
  41  */
  42 #define EXC_CMDL 0
  43 #define EXC_DIRS 1
  44 #define EXC_FILE 2
  45 static struct exclude_list {
  46         int nr;
  47         int alloc;
  48         struct exclude {
  49                 const char *pattern;
  50                 const char *base;
  51                 int baselen;
  52         } **excludes;
  53 } exclude_list[3];
  54
  55 static void add_exclude(const char *string, const char *base,
  56                         int baselen, struct exclude_list *which)
  57 {
  58         struct exclude *x = xmalloc(sizeof (*x));
  59
  60         x->pattern = string;
  61         x->base = base;
  62         x->baselen = baselen;
  63         if (which->nr == which->alloc) {
  64                 which->alloc = alloc_nr(which->alloc);
  65                 which->excludes = realloc(which->excludes,
  66                                           which->alloc * sizeof(x));
  67         }
  68         which->excludes[which->nr++] = x;
  69 }
  70
  71 static int add_excludes_from_file_1(const char *fname,
  72                                     const char *base,
  73                                     int baselen,
  74                                     struct exclude_list *which)
  75 {
  76         int fd, i;
  77         long size;
  78         char *buf, *entry;
  79
  80         fd = open(fname, O_RDONLY);
  81         if (fd < 0)
  82                 goto err;
  83         size = lseek(fd, 0, SEEK_END);
  84         if (size < 0)
  85                 goto err;
  86         lseek(fd, 0, SEEK_SET);
  87         if (size == 0) {
  88                 close(fd);
  89                 return 0;
  90         }
  91         buf = xmalloc(size);
  92         if (read(fd, buf, size) != size)
  93                 goto err;
  94         close(fd);
  95
  96         entry = buf;
  97         for (i = 0; i < size; i++) {
  98                 if (buf[i] == '\n') {
  99                         if (entry != buf + i && entry[0] != '#') {
 100                                 buf[i - (i && buf[i-1] == '\r')] = 0;
 101                                 add_exclude(entry, base, baselen, which);
 102                         }
 103                         entry = buf + i + 1;
 104                 }
 105         }
 106         return 0;
 107
 108  err:
 109         if (0 <= fd)
 110                 close(fd);
 111         return -1;
 112 }
 113
 114 static void add_excludes_from_file(const char *fname)
 115 {
 116         if (add_excludes_from_file_1(fname, "", 0,
 117                                      &exclude_list[EXC_FILE]) < 0)
 118                 die("cannot use %s as an exclude file", fname);
 119 }
 120
 121 static int push_exclude_per_directory(const char *base, int baselen)
 122 {
 123         char exclude_file[PATH_MAX];
 124         struct exclude_list *el = &exclude_list[EXC_DIRS];
 125         int current_nr = el->nr;
 126
 127         if (exclude_per_dir) {
 128                 memcpy(exclude_file, base, baselen);
 129                 strcpy(exclude_file + baselen, exclude_per_dir);
 130                 add_excludes_from_file_1(exclude_file, base, baselen, el);
 131         }
 132         return current_nr;
 133 }
 134
 135 static void pop_exclude_per_directory(int stk)
 136 {
 137         struct exclude_list *el = &exclude_list[EXC_DIRS];
 138
 139         while (stk < el->nr)
 140                 free(el->excludes[--el->nr]);
 141 }
 142
 143 /* Scan the list and let the last match determines the fate.
 144  * Return 1 for exclude, 0 for include and -1 for undecided.
 145  */
 146 static int excluded_1(const char *pathname,
 147                       int pathlen,
 148                       struct exclude_list *el)
 149 {
 150         int i;
 151
 152         if (el->nr) {
 153                 for (i = el->nr - 1; 0 <= i; i--) {
 154                         struct exclude *x = el->excludes[i];
 155                         const char *exclude = x->pattern;
 156                         int to_exclude = 1;
 157
 158                         if (*exclude == '!') {
 159                                 to_exclude = 0;
 160                                 exclude++;
 161                         }
 162
 163                         if (!strchr(exclude, '/')) {
 164                                 /* match basename */
 165                                 const char *basename = strrchr(pathname, '/');
 166                                 basename = (basename) ? basename+1 : pathname;
 167                                 if (fnmatch(exclude, basename, 0) == 0)
 168                                         return to_exclude;
 169                         }
 170                         else {
 171                                 /* match with FNM_PATHNAME:
 172                                  * exclude has base (baselen long) implicitly
 173                                  * in front of it.
 174                                  */
 175                                 int baselen = x->baselen;
 176                                 if (*exclude == '/')
 177                                         exclude++;
 178
 179                                 if (pathlen < baselen ||
 180                                     (baselen && pathname[baselen-1] != '/') ||
 181                                     strncmp(pathname, x->base, baselen))
 182                                     continue;
 183
 184                                 if (fnmatch(exclude, pathname+baselen,
 185                                             FNM_PATHNAME) == 0)
 186                                         return to_exclude;
 187                         }
 188                 }
 189         }
 190         return -1; /* undecided */
 191 }
 192
 193 static int excluded(const char *pathname)
 194 {
 195         int pathlen = strlen(pathname);
 196         int st;
 197
 198         for (st = EXC_CMDL; st <= EXC_FILE; st++) {
 199                 switch (excluded_1(pathname, pathlen, &exclude_list[st])) {
 200                 case 0:
 201                         return 0;
 202                 case 1:
 203                         return 1;
 204                 }
 205         }
 206         return 0;
 207 }
 208
 209 struct nond_on_fs {
 210         int len;
 211         char name[0];
 212 };
 213
 214 static struct nond_on_fs **dir;
 215 static int nr_dir;
 216 static int dir_alloc;
 217
 218 static void add_name(const char *pathname, int len)
 219 {
 220         struct nond_on_fs *ent;
 221
 222         if (cache_name_pos(pathname, len) >= 0)
 223                 return;
 224
 225         if (nr_dir == dir_alloc) {
 226                 dir_alloc = alloc_nr(dir_alloc);
 227                 dir = xrealloc(dir, dir_alloc*sizeof(ent));
 228         }
 229         ent = xmalloc(sizeof(*ent) + len + 1);
 230         ent->len = len;
 231         memcpy(ent->name, pathname, len);
 232         ent->name[len] = 0;
 233         dir[nr_dir++] = ent;
 234 }
 235
 236 /*
 237  * Read a directory tree. We currently ignore anything but
 238  * directories, regular files and symlinks. That's because git
 239  * doesn't handle them at all yet. Maybe that will change some
 240  * day.
 241  *
 242  * Also, we ignore the name ".git" (even if it is not a directory).
 243  * That likely will not change.
 244  */
 245 static void read_directory(const char *path, const char *base, int baselen)
 246 {
 247         DIR *dir = opendir(path);
 248
 249         if (dir) {
 250                 int exclude_stk;
 251                 struct dirent *de;
 252                 char fullname[MAXPATHLEN + 1];
 253                 memcpy(fullname, base, baselen);
 254
 255                 exclude_stk = push_exclude_per_directory(base, baselen);
 256
 257                 while ((de = readdir(dir)) != NULL) {
 258                         int len;
 259
 260                         if ((de->d_name[0] == '.') &&
 261                             (de->d_name[1] == 0 ||
 262                              !strcmp(de->d_name + 1, ".") ||
 263                              !strcmp(de->d_name + 1, "git")))
 264                                 continue;
 265                         len = strlen(de->d_name);
 266                         memcpy(fullname + baselen, de->d_name, len+1);
 267                         if (excluded(fullname) != show_ignored)
 268                                 continue;
 269
 270                         switch (DTYPE(de)) {
 271                         struct stat st;
 272                         default:
 273                                 continue;
 274                         case DT_UNKNOWN:
 275                                 if (lstat(fullname, &st))
 276                                         continue;
 277                                 if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 278                                         break;
 279                                 if (!S_ISDIR(st.st_mode))
 280                                         continue;
 281                                 /* fallthrough */
 282                         case DT_DIR:
 283                                 memcpy(fullname + baselen + len, "/", 2);
 284                                 read_directory(fullname, fullname,
 285                                                baselen + len + 1);
 286                                 continue;
 287                         case DT_REG:
 288                         case DT_LNK:
 289                                 break;
 290                         }
 291                         add_name(fullname, baselen + len);
 292                 }
 293                 closedir(dir);
 294
 295                 pop_exclude_per_directory(exclude_stk);
 296         }
 297 }
 298
 299 static int cmp_name(const void *p1, const void *p2)
 300 {
 301         const struct nond_on_fs *e1 = *(const struct nond_on_fs **)p1;
 302         const struct nond_on_fs *e2 = *(const struct nond_on_fs **)p2;
 303
 304         return cache_name_compare(e1->name, e1->len,
 305                                   e2->name, e2->len);
 306 }
 307
 308 /*
 309  * Match a pathspec against a filename. The first "len" characters
 310  * are the common prefix
 311  */
 312 static int match(const char **spec, const char *filename, int len)
 313 {
 314         const char *m;
 315
 316         while ((m = *spec++) != NULL) {
 317                 int matchlen = strlen(m + len);
 318
 319                 if (!matchlen)
 320                         return 1;
 321                 if (!strncmp(m + len, filename + len, matchlen)) {
 322                         if (m[len + matchlen - 1] == '/')
 323                                 return 1;
 324                         switch (filename[len + matchlen]) {
 325                         case '/': case '\0':
 326                                 return 1;
 327                         }
 328                 }
 329                 if (!fnmatch(m + len, filename + len, 0))
 330                         return 1;
 331         }
 332         return 0;
 333 }
 334
 335 static void show_dir_entry(const char *tag, struct nond_on_fs *ent)
 336 {
 337         int len = prefix_len;
 338         int offset = prefix_offset;
 339
 340         if (len >= ent->len)
 341                 die("git-ls-files: internal error - directory entry not superset of prefix");
 342
 343         if (pathspec && !match(pathspec, ent->name, len))
 344                 return;
 345
 346         fputs(tag, stdout);
 347         write_name_quoted("", 0, ent->name + offset, line_terminator, stdout);
 348         putchar(line_terminator);
 349 }
 350
 351 static void show_other_files(void)
 352 {
 353         int i;
 354         for (i = 0; i < nr_dir; i++) {
 355                 /* We should not have a matching entry, but we
 356                  * may have an unmerged entry for this path.
 357                  */
 358                 struct nond_on_fs *ent = dir[i];
 359                 int pos = cache_name_pos(ent->name, ent->len);
 360                 struct cache_entry *ce;
 361                 if (0 <= pos)
 362                         die("bug in show-other-files");
 363                 pos = -pos - 1;
 364                 if (pos < active_nr) {
 365                         ce = active_cache[pos];
 366                         if (ce_namelen(ce) == ent->len &&
 367                             !memcmp(ce->name, ent->name, ent->len))
 368                                 continue; /* Yup, this one exists unmerged */
 369                 }
 370                 show_dir_entry(tag_other, ent);
 371         }
 372 }
 373
 374 static void show_killed_files(void)
 375 {
 376         int i;
 377         for (i = 0; i < nr_dir; i++) {
 378                 struct nond_on_fs *ent = dir[i];
 379                 char *cp, *sp;
 380                 int pos, len, killed = 0;
 381
 382                 for (cp = ent->name; cp - ent->name < ent->len; cp = sp + 1) {
 383                         sp = strchr(cp, '/');
 384                         if (!sp) {
 385                                 /* If ent->name is prefix of an entry in the
 386                                  * cache, it will be killed.
 387                                  */
 388                                 pos = cache_name_pos(ent->name, ent->len);
 389                                 if (0 <= pos)
 390                                         die("bug in show-killed-files");
 391                                 pos = -pos - 1;
 392                                 while (pos < active_nr &&
 393                                        ce_stage(active_cache[pos]))
 394                                         pos++; /* skip unmerged */
 395                                 if (active_nr <= pos)
 396                                         break;
 397                                 /* pos points at a name immediately after
 398                                  * ent->name in the cache.  Does it expect
 399                                  * ent->name to be a directory?
 400                                  */
 401                                 len = ce_namelen(active_cache[pos]);
 402                                 if ((ent->len < len) &&
 403                                     !strncmp(active_cache[pos]->name,
 404                                              ent->name, ent->len) &&
 405                                     active_cache[pos]->name[ent->len] == '/')
 406                                         killed = 1;
 407                                 break;
 408                         }
 409                         if (0 <= cache_name_pos(ent->name, sp - ent->name)) {
 410                                 /* If any of the leading directories in
 411                                  * ent->name is registered in the cache,
 412                                  * ent->name will be killed.
 413                                  */
 414                                 killed = 1;
 415                                 break;
 416                         }
 417                 }
 418                 if (killed)
 419                         show_dir_entry(tag_killed, dir[i]);
 420         }
 421 }
 422
 423 static void show_ce_entry(const char *tag, struct cache_entry *ce)
 424 {
 425         int len = prefix_len;
 426         int offset = prefix_offset;
 427
 428         if (len >= ce_namelen(ce))
 429                 die("git-ls-files: internal error - cache entry not superset of prefix");
 430
 431         if (pathspec && !match(pathspec, ce->name, len))
 432                 return;
 433
 434         if (!show_stage) {
 435                 fputs(tag, stdout);
 436                 write_name_quoted("", 0, ce->name + offset,
 437                                   line_terminator, stdout);
 438                 putchar(line_terminator);
 439         }
 440         else {
 441                 printf("%s%06o %s %d\t",
 442                        tag,
 443                        ntohl(ce->ce_mode),
 444                        sha1_to_hex(ce->sha1),
 445                        ce_stage(ce));
 446                 write_name_quoted("", 0, ce->name + offset,
 447                                   line_terminator, stdout);
 448                 putchar(line_terminator);
 449         }
 450 }
 451
 452 static void show_files(void)
 453 {
 454         int i;
 455
 456         /* For cached/deleted files we don't need to even do the readdir */
 457         if (show_others || show_killed) {
 458                 const char *path = ".", *base = "";
 459                 int baselen = prefix_len;
 460
 461                 if (baselen)
 462                         path = base = prefix;
 463                 read_directory(path, base, baselen);
 464                 qsort(dir, nr_dir, sizeof(struct nond_on_fs *), cmp_name);
 465                 if (show_others)
 466                         show_other_files();
 467                 if (show_killed)
 468                         show_killed_files();
 469         }
 470         if (show_cached | show_stage) {
 471                 for (i = 0; i < active_nr; i++) {
 472                         struct cache_entry *ce = active_cache[i];
 473                         if (excluded(ce->name) != show_ignored)
 474                                 continue;
 475                         if (show_unmerged && !ce_stage(ce))
 476                                 continue;
 477                         show_ce_entry(ce_stage(ce) ? tag_unmerged : tag_cached, ce);
 478                 }
 479         }
 480         if (show_deleted | show_modified) {
 481                 for (i = 0; i < active_nr; i++) {
 482                         struct cache_entry *ce = active_cache[i];
 483                         struct stat st;
 484                         int err;
 485                         if (excluded(ce->name) != show_ignored)
 486                                 continue;
 487                         err = lstat(ce->name, &st);
 488                         if (show_deleted && err)
 489                                 show_ce_entry(tag_removed, ce);
 490                         if (show_modified && ce_modified(ce, &st))
 491                                 show_ce_entry(tag_modified, ce);
 492                 }
 493         }
 494 }
 495
 496 /*
 497  * Prune the index to only contain stuff starting with "prefix"
 498  */
 499 static void prune_cache(void)
 500 {
 501         int pos = cache_name_pos(prefix, prefix_len);
 502         unsigned int first, last;
 503
 504         if (pos < 0)
 505                 pos = -pos-1;
 506         active_cache += pos;
 507         active_nr -= pos;
 508         first = 0;
 509         last = active_nr;
 510         while (last > first) {
 511                 int next = (last + first) >> 1;
 512                 struct cache_entry *ce = active_cache[next];
 513                 if (!strncmp(ce->name, prefix, prefix_len)) {
 514                         first = next+1;
 515                         continue;
 516                 }
 517                 last = next;
 518         }
 519         active_nr = last;
 520 }
 521
 522 static void verify_pathspec(void)
 523 {
 524         const char **p, *n, *prev;
 525         char *real_prefix;
 526         unsigned long max;
 527
 528         prev = NULL;
 529         max = PATH_MAX;
 530         for (p = pathspec; (n = *p) != NULL; p++) {
 531                 int i, len = 0;
 532                 for (i = 0; i < max; i++) {
 533                         char c = n[i];
 534                         if (prev && prev[i] != c)
 535                                 break;
 536                         if (!c || c == '*' || c == '?')
 537                                 break;
 538                         if (c == '/')
 539                                 len = i+1;
 540                 }
 541                 prev = n;
 542                 if (len < max) {
 543                         max = len;
 544                         if (!max)
 545                                 break;
 546                 }
 547         }
 548
 549         if (prefix_offset > max || memcmp(prev, prefix, prefix_offset))
 550                 die("git-ls-files: cannot generate relative filenames containing '..'");
 551
 552         real_prefix = NULL;
 553         prefix_len = max;
 554         if (max) {
 555                 real_prefix = xmalloc(max + 1);
 556                 memcpy(real_prefix, prev, max);
 557                 real_prefix[max] = 0;
 558         }
 559         prefix = real_prefix;
 560 }
 561
 562 static const char ls_files_usage[] =
 563         "git-ls-files [-z] [-t] (--[cached|deleted|others|stage|unmerged|killed|modified])* "
 564         "[ --ignored ] [--exclude=<pattern>] [--exclude-from=<file>] "
 565         "[ --exclude-per-directory=<filename> ] [--full-name] [--] [<file>]*";
 566
 567 int main(int argc, const char **argv)
 568 {
 569         int i;
 570         int exc_given = 0;
 571
 572         prefix = setup_git_directory();
 573         if (prefix)
 574                 prefix_offset = strlen(prefix);
 575         git_config(git_default_config);
 576
 577         for (i = 1; i < argc; i++) {
 578                 const char *arg = argv[i];
 579
 580                 if (!strcmp(arg, "--")) {
 581                         i++;
 582                         break;
 583                 }
 584                 if (!strcmp(arg, "-z")) {
 585                         line_terminator = 0;
 586                         continue;
 587                 }
 588                 if (!strcmp(arg, "-t")) {
 589                         tag_cached = "H ";
 590                         tag_unmerged = "M ";
 591                         tag_removed = "R ";
 592                         tag_modified = "C ";
 593                         tag_other = "? ";
 594                         tag_killed = "K ";
 595                         continue;
 596                 }
 597                 if (!strcmp(arg, "-c") || !strcmp(arg, "--cached")) {
 598                         show_cached = 1;
 599                         continue;
 600                 }
 601                 if (!strcmp(arg, "-d") || !strcmp(arg, "--deleted")) {
 602                         show_deleted = 1;
 603                         continue;
 604                 }
 605                 if (!strcmp(arg, "-m") || !strcmp(arg, "--modified")) {
 606                         show_modified = 1;
 607                         continue;
 608                 }
 609                 if (!strcmp(arg, "-o") || !strcmp(arg, "--others")) {
 610                         show_others = 1;
 611                         continue;
 612                 }
 613                 if (!strcmp(arg, "-i") || !strcmp(arg, "--ignored")) {
 614                         show_ignored = 1;
 615                         continue;
 616                 }
 617                 if (!strcmp(arg, "-s") || !strcmp(arg, "--stage")) {
 618                         show_stage = 1;
 619                         continue;
 620                 }
 621                 if (!strcmp(arg, "-k") || !strcmp(arg, "--killed")) {
 622                         show_killed = 1;
 623                         continue;
 624                 }
 625                 if (!strcmp(arg, "-u") || !strcmp(arg, "--unmerged")) {
 626                         /* There's no point in showing unmerged unless
 627                          * you also show the stage information.
 628                          */
 629                         show_stage = 1;
 630                         show_unmerged = 1;
 631                         continue;
 632                 }
 633                 if (!strcmp(arg, "-x") && i+1 < argc) {
 634                         exc_given = 1;
 635                         add_exclude(argv[++i], "", 0, &exclude_list[EXC_CMDL]);
 636                         continue;
 637                 }
 638                 if (!strncmp(arg, "--exclude=", 10)) {
 639                         exc_given = 1;
 640                         add_exclude(arg+10, "", 0, &exclude_list[EXC_CMDL]);
 641                         continue;
 642                 }
 643                 if (!strcmp(arg, "-X") && i+1 < argc) {
 644                         exc_given = 1;
 645                         add_excludes_from_file(argv[++i]);
 646                         continue;
 647                 }
 648                 if (!strncmp(arg, "--exclude-from=", 15)) {
 649                         exc_given = 1;
 650                         add_excludes_from_file(arg+15);
 651                         continue;
 652                 }
 653                 if (!strncmp(arg, "--exclude-per-directory=", 24)) {
 654                         exc_given = 1;
 655                         exclude_per_dir = arg + 24;
 656                         continue;
 657                 }
 658                 if (!strcmp(arg, "--full-name")) {
 659                         prefix_offset = 0;
 660                         continue;
 661                 }
 662                 if (*arg == '-')
 663                         usage(ls_files_usage);
 664                 break;
 665         }
 666
 667         pathspec = get_pathspec(prefix, argv + i);
 668
 669         /* Verify that the pathspec matches the prefix */
 670         if (pathspec)
 671                 verify_pathspec();
 672
 673         if (show_ignored && !exc_given) {
 674                 fprintf(stderr, "%s: --ignored needs some exclude pattern\n",
 675                         argv[0]);
 676                 exit(1);
 677         }
 678
 679         /* With no flags, we default to showing the cached files */
 680         if (!(show_stage | show_deleted | show_others | show_unmerged |
 681               show_killed | show_modified))
 682                 show_cached = 1;
 683
 684         read_cache();
 685         if (prefix)
 686                 prune_cache();
 687         show_files();
 688         return 0;
 689 }