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 show_other_directories = 0;
  23 static int line_terminator = '\n';
  24
  25 static int prefix_len = 0, prefix_offset = 0;
  26 static const char *prefix = NULL;
  27 static const char **pathspec = NULL;
  28
  29 static const char *tag_cached = "";
  30 static const char *tag_unmerged = "";
  31 static const char *tag_removed = "";
  32 static const char *tag_other = "";
  33 static const char *tag_killed = "";
  34 static const char *tag_modified = "";
  35
  36 static const char *exclude_per_dir = NULL;
  37
  38 /* We maintain three exclude pattern lists:
  39  * EXC_CMDL lists patterns explicitly given on the command line.
  40  * EXC_DIRS lists patterns obtained from per-directory ignore files.
  41  * EXC_FILE lists patterns from fallback ignore files.
  42  */
  43 #define EXC_CMDL 0
  44 #define EXC_DIRS 1
  45 #define EXC_FILE 2
  46 static struct exclude_list {
  47         int nr;
  48         int alloc;
  49         struct exclude {
  50                 const char *pattern;
  51                 const char *base;
  52                 int baselen;
  53         } **excludes;
  54 } exclude_list[3];
  55
  56 static void add_exclude(const char *string, const char *base,
  57                         int baselen, struct exclude_list *which)
  58 {
  59         struct exclude *x = xmalloc(sizeof (*x));
  60
  61         x->pattern = string;
  62         x->base = base;
  63         x->baselen = baselen;
  64         if (which->nr == which->alloc) {
  65                 which->alloc = alloc_nr(which->alloc);
  66                 which->excludes = realloc(which->excludes,
  67                                           which->alloc * sizeof(x));
  68         }
  69         which->excludes[which->nr++] = x;
  70 }
  71
  72 static int add_excludes_from_file_1(const char *fname,
  73                                     const char *base,
  74                                     int baselen,
  75                                     struct exclude_list *which)
  76 {
  77         int fd, i;
  78         long size;
  79         char *buf, *entry;
  80
  81         fd = open(fname, O_RDONLY);
  82         if (fd < 0)
  83                 goto err;
  84         size = lseek(fd, 0, SEEK_END);
  85         if (size < 0)
  86                 goto err;
  87         lseek(fd, 0, SEEK_SET);
  88         if (size == 0) {
  89                 close(fd);
  90                 return 0;
  91         }
  92         buf = xmalloc(size);
  93         if (read(fd, buf, size) != size)
  94                 goto err;
  95         close(fd);
  96
  97         entry = buf;
  98         for (i = 0; i < size; i++) {
  99                 if (buf[i] == '\n') {
 100                         if (entry != buf + i && entry[0] != '#') {
 101                                 buf[i - (i && buf[i-1] == '\r')] = 0;
 102                                 add_exclude(entry, base, baselen, which);
 103                         }
 104                         entry = buf + i + 1;
 105                 }
 106         }
 107         return 0;
 108
 109  err:
 110         if (0 <= fd)
 111                 close(fd);
 112         return -1;
 113 }
 114
 115 static void add_excludes_from_file(const char *fname)
 116 {
 117         if (add_excludes_from_file_1(fname, "", 0,
 118                                      &exclude_list[EXC_FILE]) < 0)
 119                 die("cannot use %s as an exclude file", fname);
 120 }
 121
 122 static int push_exclude_per_directory(const char *base, int baselen)
 123 {
 124         char exclude_file[PATH_MAX];
 125         struct exclude_list *el = &exclude_list[EXC_DIRS];
 126         int current_nr = el->nr;
 127
 128         if (exclude_per_dir) {
 129                 memcpy(exclude_file, base, baselen);
 130                 strcpy(exclude_file + baselen, exclude_per_dir);
 131                 add_excludes_from_file_1(exclude_file, base, baselen, el);
 132         }
 133         return current_nr;
 134 }
 135
 136 static void pop_exclude_per_directory(int stk)
 137 {
 138         struct exclude_list *el = &exclude_list[EXC_DIRS];
 139
 140         while (stk < el->nr)
 141                 free(el->excludes[--el->nr]);
 142 }
 143
 144 /* Scan the list and let the last match determines the fate.
 145  * Return 1 for exclude, 0 for include and -1 for undecided.
 146  */
 147 static int excluded_1(const char *pathname,
 148                       int pathlen,
 149                       struct exclude_list *el)
 150 {
 151         int i;
 152
 153         if (el->nr) {
 154                 for (i = el->nr - 1; 0 <= i; i--) {
 155                         struct exclude *x = el->excludes[i];
 156                         const char *exclude = x->pattern;
 157                         int to_exclude = 1;
 158
 159                         if (*exclude == '!') {
 160                                 to_exclude = 0;
 161                                 exclude++;
 162                         }
 163
 164                         if (!strchr(exclude, '/')) {
 165                                 /* match basename */
 166                                 const char *basename = strrchr(pathname, '/');
 167                                 basename = (basename) ? basename+1 : pathname;
 168                                 if (fnmatch(exclude, basename, 0) == 0)
 169                                         return to_exclude;
 170                         }
 171                         else {
 172                                 /* match with FNM_PATHNAME:
 173                                  * exclude has base (baselen long) implicitly
 174                                  * in front of it.
 175                                  */
 176                                 int baselen = x->baselen;
 177                                 if (*exclude == '/')
 178                                         exclude++;
 179
 180                                 if (pathlen < baselen ||
 181                                     (baselen && pathname[baselen-1] != '/') ||
 182                                     strncmp(pathname, x->base, baselen))
 183                                     continue;
 184
 185                                 if (fnmatch(exclude, pathname+baselen,
 186                                             FNM_PATHNAME) == 0)
 187                                         return to_exclude;
 188                         }
 189                 }
 190         }
 191         return -1; /* undecided */
 192 }
 193
 194 static int excluded(const char *pathname)
 195 {
 196         int pathlen = strlen(pathname);
 197         int st;
 198
 199         for (st = EXC_CMDL; st <= EXC_FILE; st++) {
 200                 switch (excluded_1(pathname, pathlen, &exclude_list[st])) {
 201                 case 0:
 202                         return 0;
 203                 case 1:
 204                         return 1;
 205                 }
 206         }
 207         return 0;
 208 }
 209
 210 struct nond_on_fs {
 211         int len;
 212         char name[0];
 213 };
 214
 215 static struct nond_on_fs **dir;
 216 static int nr_dir;
 217 static int dir_alloc;
 218
 219 static void add_name(const char *pathname, int len)
 220 {
 221         struct nond_on_fs *ent;
 222
 223         if (cache_name_pos(pathname, len) >= 0)
 224                 return;
 225
 226         if (nr_dir == dir_alloc) {
 227                 dir_alloc = alloc_nr(dir_alloc);
 228                 dir = xrealloc(dir, dir_alloc*sizeof(ent));
 229         }
 230         ent = xmalloc(sizeof(*ent) + len + 1);
 231         ent->len = len;
 232         memcpy(ent->name, pathname, len);
 233         ent->name[len] = 0;
 234         dir[nr_dir++] = ent;
 235 }
 236
 237 static int dir_exists(const char *dirname, int len)
 238 {
 239         int pos = cache_name_pos(dirname, len);
 240         if (pos >= 0)
 241                 return 1;
 242         pos = -pos-1;
 243         if (pos >= active_nr) /* can't */
 244                 return 0;
 245         return !strncmp(active_cache[pos]->name, dirname, len);
 246 }
 247
 248 /*
 249  * Read a directory tree. We currently ignore anything but
 250  * directories, regular files and symlinks. That's because git
 251  * doesn't handle them at all yet. Maybe that will change some
 252  * day.
 253  *
 254  * Also, we ignore the name ".git" (even if it is not a directory).
 255  * That likely will not change.
 256  */
 257 static void read_directory(const char *path, const char *base, int baselen)
 258 {
 259         DIR *dir = opendir(path);
 260
 261         if (dir) {
 262                 int exclude_stk;
 263                 struct dirent *de;
 264                 char fullname[MAXPATHLEN + 1];
 265                 memcpy(fullname, base, baselen);
 266
 267                 exclude_stk = push_exclude_per_directory(base, baselen);
 268
 269                 while ((de = readdir(dir)) != NULL) {
 270                         int len;
 271
 272                         if ((de->d_name[0] == '.') &&
 273                             (de->d_name[1] == 0 ||
 274                              !strcmp(de->d_name + 1, ".") ||
 275                              !strcmp(de->d_name + 1, "git")))
 276                                 continue;
 277                         len = strlen(de->d_name);
 278                         memcpy(fullname + baselen, de->d_name, len+1);
 279                         if (excluded(fullname) != show_ignored)
 280                                 continue;
 281
 282                         switch (DTYPE(de)) {
 283                         struct stat st;
 284                         default:
 285                                 continue;
 286                         case DT_UNKNOWN:
 287                                 if (lstat(fullname, &st))
 288                                         continue;
 289                                 if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 290                                         break;
 291                                 if (!S_ISDIR(st.st_mode))
 292                                         continue;
 293                                 /* fallthrough */
 294                         case DT_DIR:
 295                                 memcpy(fullname + baselen + len, "/", 2);
 296                                 if (show_other_directories &&
 297                                     !dir_exists(fullname, baselen + len + 1))
 298                                         break;
 299                                 read_directory(fullname, fullname,
 300                                                baselen + len + 1);
 301                                 continue;
 302                         case DT_REG:
 303                         case DT_LNK:
 304                                 break;
 305                         }
 306                         add_name(fullname, baselen + len);
 307                 }
 308                 closedir(dir);
 309
 310                 pop_exclude_per_directory(exclude_stk);
 311         }
 312 }
 313
 314 static int cmp_name(const void *p1, const void *p2)
 315 {
 316         const struct nond_on_fs *e1 = *(const struct nond_on_fs **)p1;
 317         const struct nond_on_fs *e2 = *(const struct nond_on_fs **)p2;
 318
 319         return cache_name_compare(e1->name, e1->len,
 320                                   e2->name, e2->len);
 321 }
 322
 323 /*
 324  * Match a pathspec against a filename. The first "len" characters
 325  * are the common prefix
 326  */
 327 static int match(const char **spec, const char *filename, int len)
 328 {
 329         const char *m;
 330
 331         while ((m = *spec++) != NULL) {
 332                 int matchlen = strlen(m + len);
 333
 334                 if (!matchlen)
 335                         return 1;
 336                 if (!strncmp(m + len, filename + len, matchlen)) {
 337                         if (m[len + matchlen - 1] == '/')
 338                                 return 1;
 339                         switch (filename[len + matchlen]) {
 340                         case '/': case '\0':
 341                                 return 1;
 342                         }
 343                 }
 344                 if (!fnmatch(m + len, filename + len, 0))
 345                         return 1;
 346         }
 347         return 0;
 348 }
 349
 350 static void show_dir_entry(const char *tag, struct nond_on_fs *ent)
 351 {
 352         int len = prefix_len;
 353         int offset = prefix_offset;
 354
 355         if (len >= ent->len)
 356                 die("git-ls-files: internal error - directory entry not superset of prefix");
 357
 358         if (pathspec && !match(pathspec, ent->name, len))
 359                 return;
 360
 361         fputs(tag, stdout);
 362         write_name_quoted("", 0, ent->name + offset, line_terminator, stdout);
 363         putchar(line_terminator);
 364 }
 365
 366 static void show_other_files(void)
 367 {
 368         int i;
 369         for (i = 0; i < nr_dir; i++) {
 370                 /* We should not have a matching entry, but we
 371                  * may have an unmerged entry for this path.
 372                  */
 373                 struct nond_on_fs *ent = dir[i];
 374                 int pos = cache_name_pos(ent->name, ent->len);
 375                 struct cache_entry *ce;
 376                 if (0 <= pos)
 377                         die("bug in show-other-files");
 378                 pos = -pos - 1;
 379                 if (pos < active_nr) {
 380                         ce = active_cache[pos];
 381                         if (ce_namelen(ce) == ent->len &&
 382                             !memcmp(ce->name, ent->name, ent->len))
 383                                 continue; /* Yup, this one exists unmerged */
 384                 }
 385                 show_dir_entry(tag_other, ent);
 386         }
 387 }
 388
 389 static void show_killed_files(void)
 390 {
 391         int i;
 392         for (i = 0; i < nr_dir; i++) {
 393                 struct nond_on_fs *ent = dir[i];
 394                 char *cp, *sp;
 395                 int pos, len, killed = 0;
 396
 397                 for (cp = ent->name; cp - ent->name < ent->len; cp = sp + 1) {
 398                         sp = strchr(cp, '/');
 399                         if (!sp) {
 400                                 /* If ent->name is prefix of an entry in the
 401                                  * cache, it will be killed.
 402                                  */
 403                                 pos = cache_name_pos(ent->name, ent->len);
 404                                 if (0 <= pos)
 405                                         die("bug in show-killed-files");
 406                                 pos = -pos - 1;
 407                                 while (pos < active_nr &&
 408                                        ce_stage(active_cache[pos]))
 409                                         pos++; /* skip unmerged */
 410                                 if (active_nr <= pos)
 411                                         break;
 412                                 /* pos points at a name immediately after
 413                                  * ent->name in the cache.  Does it expect
 414                                  * ent->name to be a directory?
 415                                  */
 416                                 len = ce_namelen(active_cache[pos]);
 417                                 if ((ent->len < len) &&
 418                                     !strncmp(active_cache[pos]->name,
 419                                              ent->name, ent->len) &&
 420                                     active_cache[pos]->name[ent->len] == '/')
 421                                         killed = 1;
 422                                 break;
 423                         }
 424                         if (0 <= cache_name_pos(ent->name, sp - ent->name)) {
 425                                 /* If any of the leading directories in
 426                                  * ent->name is registered in the cache,
 427                                  * ent->name will be killed.
 428                                  */
 429                                 killed = 1;
 430                                 break;
 431                         }
 432                 }
 433                 if (killed)
 434                         show_dir_entry(tag_killed, dir[i]);
 435         }
 436 }
 437
 438 static void show_ce_entry(const char *tag, struct cache_entry *ce)
 439 {
 440         int len = prefix_len;
 441         int offset = prefix_offset;
 442
 443         if (len >= ce_namelen(ce))
 444                 die("git-ls-files: internal error - cache entry not superset of prefix");
 445
 446         if (pathspec && !match(pathspec, ce->name, len))
 447                 return;
 448
 449         if (!show_stage) {
 450                 fputs(tag, stdout);
 451                 write_name_quoted("", 0, ce->name + offset,
 452                                   line_terminator, stdout);
 453                 putchar(line_terminator);
 454         }
 455         else {
 456                 printf("%s%06o %s %d\t",
 457                        tag,
 458                        ntohl(ce->ce_mode),
 459                        sha1_to_hex(ce->sha1),
 460                        ce_stage(ce));
 461                 write_name_quoted("", 0, ce->name + offset,
 462                                   line_terminator, stdout);
 463                 putchar(line_terminator);
 464         }
 465 }
 466
 467 static void show_files(void)
 468 {
 469         int i;
 470
 471         /* For cached/deleted files we don't need to even do the readdir */
 472         if (show_others || show_killed) {
 473                 const char *path = ".", *base = "";
 474                 int baselen = prefix_len;
 475
 476                 if (baselen)
 477                         path = base = prefix;
 478                 read_directory(path, base, baselen);
 479                 qsort(dir, nr_dir, sizeof(struct nond_on_fs *), cmp_name);
 480                 if (show_others)
 481                         show_other_files();
 482                 if (show_killed)
 483                         show_killed_files();
 484         }
 485         if (show_cached | show_stage) {
 486                 for (i = 0; i < active_nr; i++) {
 487                         struct cache_entry *ce = active_cache[i];
 488                         if (excluded(ce->name) != show_ignored)
 489                                 continue;
 490                         if (show_unmerged && !ce_stage(ce))
 491                                 continue;
 492                         show_ce_entry(ce_stage(ce) ? tag_unmerged : tag_cached, ce);
 493                 }
 494         }
 495         if (show_deleted | show_modified) {
 496                 for (i = 0; i < active_nr; i++) {
 497                         struct cache_entry *ce = active_cache[i];
 498                         struct stat st;
 499                         int err;
 500                         if (excluded(ce->name) != show_ignored)
 501                                 continue;
 502                         err = lstat(ce->name, &st);
 503                         if (show_deleted && err)
 504                                 show_ce_entry(tag_removed, ce);
 505                         if (show_modified && ce_modified(ce, &st))
 506                                 show_ce_entry(tag_modified, ce);
 507                 }
 508         }
 509 }
 510
 511 /*
 512  * Prune the index to only contain stuff starting with "prefix"
 513  */
 514 static void prune_cache(void)
 515 {
 516         int pos = cache_name_pos(prefix, prefix_len);
 517         unsigned int first, last;
 518
 519         if (pos < 0)
 520                 pos = -pos-1;
 521         active_cache += pos;
 522         active_nr -= pos;
 523         first = 0;
 524         last = active_nr;
 525         while (last > first) {
 526                 int next = (last + first) >> 1;
 527                 struct cache_entry *ce = active_cache[next];
 528                 if (!strncmp(ce->name, prefix, prefix_len)) {
 529                         first = next+1;
 530                         continue;
 531                 }
 532                 last = next;
 533         }
 534         active_nr = last;
 535 }
 536
 537 static void verify_pathspec(void)
 538 {
 539         const char **p, *n, *prev;
 540         char *real_prefix;
 541         unsigned long max;
 542
 543         prev = NULL;
 544         max = PATH_MAX;
 545         for (p = pathspec; (n = *p) != NULL; p++) {
 546                 int i, len = 0;
 547                 for (i = 0; i < max; i++) {
 548                         char c = n[i];
 549                         if (prev && prev[i] != c)
 550                                 break;
 551                         if (!c || c == '*' || c == '?')
 552                                 break;
 553                         if (c == '/')
 554                                 len = i+1;
 555                 }
 556                 prev = n;
 557                 if (len < max) {
 558                         max = len;
 559                         if (!max)
 560                                 break;
 561                 }
 562         }
 563
 564         if (prefix_offset > max || memcmp(prev, prefix, prefix_offset))
 565                 die("git-ls-files: cannot generate relative filenames containing '..'");
 566
 567         real_prefix = NULL;
 568         prefix_len = max;
 569         if (max) {
 570                 real_prefix = xmalloc(max + 1);
 571                 memcpy(real_prefix, prev, max);
 572                 real_prefix[max] = 0;
 573         }
 574         prefix = real_prefix;
 575 }
 576
 577 static const char ls_files_usage[] =
 578         "git-ls-files [-z] [-t] (--[cached|deleted|others|stage|unmerged|killed|modified])* "
 579         "[ --ignored ] [--exclude=<pattern>] [--exclude-from=<file>] "
 580         "[ --exclude-per-directory=<filename> ] [--full-name] [--] [<file>]*";
 581
 582 int main(int argc, const char **argv)
 583 {
 584         int i;
 585         int exc_given = 0;
 586
 587         prefix = setup_git_directory();
 588         if (prefix)
 589                 prefix_offset = strlen(prefix);
 590         git_config(git_default_config);
 591
 592         for (i = 1; i < argc; i++) {
 593                 const char *arg = argv[i];
 594
 595                 if (!strcmp(arg, "--")) {
 596                         i++;
 597                         break;
 598                 }
 599                 if (!strcmp(arg, "-z")) {
 600                         line_terminator = 0;
 601                         continue;
 602                 }
 603                 if (!strcmp(arg, "-t")) {
 604                         tag_cached = "H ";
 605                         tag_unmerged = "M ";
 606                         tag_removed = "R ";
 607                         tag_modified = "C ";
 608                         tag_other = "? ";
 609                         tag_killed = "K ";
 610                         continue;
 611                 }
 612                 if (!strcmp(arg, "-c") || !strcmp(arg, "--cached")) {
 613                         show_cached = 1;
 614                         continue;
 615                 }
 616                 if (!strcmp(arg, "-d") || !strcmp(arg, "--deleted")) {
 617                         show_deleted = 1;
 618                         continue;
 619                 }
 620                 if (!strcmp(arg, "-m") || !strcmp(arg, "--modified")) {
 621                         show_modified = 1;
 622                         continue;
 623                 }
 624                 if (!strcmp(arg, "-o") || !strcmp(arg, "--others")) {
 625                         show_others = 1;
 626                         continue;
 627                 }
 628                 if (!strcmp(arg, "-i") || !strcmp(arg, "--ignored")) {
 629                         show_ignored = 1;
 630                         continue;
 631                 }
 632                 if (!strcmp(arg, "-s") || !strcmp(arg, "--stage")) {
 633                         show_stage = 1;
 634                         continue;
 635                 }
 636                 if (!strcmp(arg, "-k") || !strcmp(arg, "--killed")) {
 637                         show_killed = 1;
 638                         continue;
 639                 }
 640                 if (!strcmp(arg, "--directory")) {
 641                         show_other_directories = 1;
 642                         continue;
 643                 }
 644                 if (!strcmp(arg, "-u") || !strcmp(arg, "--unmerged")) {
 645                         /* There's no point in showing unmerged unless
 646                          * you also show the stage information.
 647                          */
 648                         show_stage = 1;
 649                         show_unmerged = 1;
 650                         continue;
 651                 }
 652                 if (!strcmp(arg, "-x") && i+1 < argc) {
 653                         exc_given = 1;
 654                         add_exclude(argv[++i], "", 0, &exclude_list[EXC_CMDL]);
 655                         continue;
 656                 }
 657                 if (!strncmp(arg, "--exclude=", 10)) {
 658                         exc_given = 1;
 659                         add_exclude(arg+10, "", 0, &exclude_list[EXC_CMDL]);
 660                         continue;
 661                 }
 662                 if (!strcmp(arg, "-X") && i+1 < argc) {
 663                         exc_given = 1;
 664                         add_excludes_from_file(argv[++i]);
 665                         continue;
 666                 }
 667                 if (!strncmp(arg, "--exclude-from=", 15)) {
 668                         exc_given = 1;
 669                         add_excludes_from_file(arg+15);
 670                         continue;
 671                 }
 672                 if (!strncmp(arg, "--exclude-per-directory=", 24)) {
 673                         exc_given = 1;
 674                         exclude_per_dir = arg + 24;
 675                         continue;
 676                 }
 677                 if (!strcmp(arg, "--full-name")) {
 678                         prefix_offset = 0;
 679                         continue;
 680                 }
 681                 if (*arg == '-')
 682                         usage(ls_files_usage);
 683                 break;
 684         }
 685
 686         pathspec = get_pathspec(prefix, argv + i);
 687
 688         /* Verify that the pathspec matches the prefix */
 689         if (pathspec)
 690                 verify_pathspec();
 691
 692         if (show_ignored && !exc_given) {
 693                 fprintf(stderr, "%s: --ignored needs some exclude pattern\n",
 694                         argv[0]);
 695                 exit(1);
 696         }
 697
 698         /* With no flags, we default to showing the cached files */
 699         if (!(show_stage | show_deleted | show_others | show_unmerged |
 700               show_killed | show_modified))
 701                 show_cached = 1;
 702
 703         read_cache();
 704         if (prefix)
 705                 prune_cache();
 706         show_files();
 707         return 0;
 708 }