dir.c

   1 /*
   2  * This handles recursive filename detection with exclude
   3  * files, index knowledge etc..
   4  *
   5  * Copyright (C) Linus Torvalds, 2005-2006
   6  *               Junio Hamano, 2005-2006
   7  */
   8 #include "cache.h"
   9 #include "dir.h"
  10
  11 int common_prefix(const char **pathspec)
  12 {
  13         const char *path, *slash, *next;
  14         int prefix;
  15
  16         if (!pathspec)
  17                 return 0;
  18
  19         path = *pathspec;
  20         slash = strrchr(path, '/');
  21         if (!slash)
  22                 return 0;
  23
  24         prefix = slash - path + 1;
  25         while ((next = *++pathspec) != NULL) {
  26                 int len = strlen(next);
  27                 if (len >= prefix && !memcmp(path, next, len))
  28                         continue;
  29                 for (;;) {
  30                         if (!len)
  31                                 return 0;
  32                         if (next[--len] != '/')
  33                                 continue;
  34                         if (memcmp(path, next, len+1))
  35                                 continue;
  36                         prefix = len + 1;
  37                         break;
  38                 }
  39         }
  40         return prefix;
  41 }
  42
  43 /*
  44  * Does 'match' matches the given name?
  45  * A match is found if
  46  *
  47  * (1) the 'match' string is leading directory of 'name', or
  48  * (2) the 'match' string is a wildcard and matches 'name', or
  49  * (3) the 'match' string is exactly the same as 'name'.
  50  *
  51  * and the return value tells which case it was.
  52  *
  53  * It returns 0 when there is no match.
  54  */
  55 static int match_one(const char *match, const char *name, int namelen)
  56 {
  57         int matchlen;
  58
  59         /* If the match was just the prefix, we matched */
  60         matchlen = strlen(match);
  61         if (!matchlen)
  62                 return MATCHED_RECURSIVELY;
  63
  64         /*
  65          * If we don't match the matchstring exactly,
  66          * we need to match by fnmatch
  67          */
  68         if (strncmp(match, name, matchlen))
  69                 return !fnmatch(match, name, 0) ? MATCHED_FNMATCH : 0;
  70
  71         if (!name[matchlen])
  72                 return MATCHED_EXACTLY;
  73         if (match[matchlen-1] == '/' || name[matchlen] == '/')
  74                 return MATCHED_RECURSIVELY;
  75         return 0;
  76 }
  77
  78 /*
  79  * Given a name and a list of pathspecs, see if the name matches
  80  * any of the pathspecs.  The caller is also interested in seeing
  81  * all pathspec matches some names it calls this function with
  82  * (otherwise the user could have mistyped the unmatched pathspec),
  83  * and a mark is left in seen[] array for pathspec element that
  84  * actually matched anything.
  85  */
  86 int match_pathspec(const char **pathspec, const char *name, int namelen, int prefix, char *seen)
  87 {
  88         int retval;
  89         const char *match;
  90
  91         name += prefix;
  92         namelen -= prefix;
  93
  94         for (retval = 0; (match = *pathspec++) != NULL; seen++) {
  95                 int how;
  96                 if (retval && *seen == MATCHED_EXACTLY)
  97                         continue;
  98                 match += prefix;
  99                 how = match_one(match, name, namelen);
 100                 if (how) {
 101                         if (retval < how)
 102                                 retval = how;
 103                         if (*seen < how)
 104                                 *seen = how;
 105                 }
 106         }
 107         return retval;
 108 }
 109
 110 void add_exclude(const char *string, const char *base,
 111                  int baselen, struct exclude_list *which)
 112 {
 113         struct exclude *x = xmalloc(sizeof (*x));
 114
 115         x->pattern = string;
 116         x->base = base;
 117         x->baselen = baselen;
 118         if (which->nr == which->alloc) {
 119                 which->alloc = alloc_nr(which->alloc);
 120                 which->excludes = xrealloc(which->excludes,
 121                                            which->alloc * sizeof(x));
 122         }
 123         which->excludes[which->nr++] = x;
 124 }
 125
 126 static int add_excludes_from_file_1(const char *fname,
 127                                     const char *base,
 128                                     int baselen,
 129                                     struct exclude_list *which)
 130 {
 131         struct stat st;
 132         int fd, i;
 133         size_t size;
 134         char *buf, *entry;
 135
 136         fd = open(fname, O_RDONLY);
 137         if (fd < 0 || fstat(fd, &st) < 0)
 138                 goto err;
 139         size = xsize_t(st.st_size);
 140         if (size == 0) {
 141                 close(fd);
 142                 return 0;
 143         }
 144         buf = xmalloc(size+1);
 145         if (read_in_full(fd, buf, size) != size)
 146                 goto err;
 147         close(fd);
 148
 149         buf[size++] = '\n';
 150         entry = buf;
 151         for (i = 0; i < size; i++) {
 152                 if (buf[i] == '\n') {
 153                         if (entry != buf + i && entry[0] != '#') {
 154                                 buf[i - (i && buf[i-1] == '\r')] = 0;
 155                                 add_exclude(entry, base, baselen, which);
 156                         }
 157                         entry = buf + i + 1;
 158                 }
 159         }
 160         return 0;
 161
 162  err:
 163         if (0 <= fd)
 164                 close(fd);
 165         return -1;
 166 }
 167
 168 void add_excludes_from_file(struct dir_struct *dir, const char *fname)
 169 {
 170         if (add_excludes_from_file_1(fname, "", 0,
 171                                      &dir->exclude_list[EXC_FILE]) < 0)
 172                 die("cannot use %s as an exclude file", fname);
 173 }
 174
 175 int push_exclude_per_directory(struct dir_struct *dir, const char *base, int baselen)
 176 {
 177         char exclude_file[PATH_MAX];
 178         struct exclude_list *el = &dir->exclude_list[EXC_DIRS];
 179         int current_nr = el->nr;
 180
 181         if (dir->exclude_per_dir) {
 182                 memcpy(exclude_file, base, baselen);
 183                 strcpy(exclude_file + baselen, dir->exclude_per_dir);
 184                 add_excludes_from_file_1(exclude_file, base, baselen, el);
 185         }
 186         return current_nr;
 187 }
 188
 189 void pop_exclude_per_directory(struct dir_struct *dir, int stk)
 190 {
 191         struct exclude_list *el = &dir->exclude_list[EXC_DIRS];
 192
 193         while (stk < el->nr)
 194                 free(el->excludes[--el->nr]);
 195 }
 196
 197 /* Scan the list and let the last match determines the fate.
 198  * Return 1 for exclude, 0 for include and -1 for undecided.
 199  */
 200 static int excluded_1(const char *pathname,
 201                       int pathlen,
 202                       struct exclude_list *el)
 203 {
 204         int i;
 205
 206         if (el->nr) {
 207                 for (i = el->nr - 1; 0 <= i; i--) {
 208                         struct exclude *x = el->excludes[i];
 209                         const char *exclude = x->pattern;
 210                         int to_exclude = 1;
 211
 212                         if (*exclude == '!') {
 213                                 to_exclude = 0;
 214                                 exclude++;
 215                         }
 216
 217                         if (!strchr(exclude, '/')) {
 218                                 /* match basename */
 219                                 const char *basename = strrchr(pathname, '/');
 220                                 basename = (basename) ? basename+1 : pathname;
 221                                 if (fnmatch(exclude, basename, 0) == 0)
 222                                         return to_exclude;
 223                         }
 224                         else {
 225                                 /* match with FNM_PATHNAME:
 226                                  * exclude has base (baselen long) implicitly
 227                                  * in front of it.
 228                                  */
 229                                 int baselen = x->baselen;
 230                                 if (*exclude == '/')
 231                                         exclude++;
 232
 233                                 if (pathlen < baselen ||
 234                                     (baselen && pathname[baselen-1] != '/') ||
 235                                     strncmp(pathname, x->base, baselen))
 236                                     continue;
 237
 238                                 if (fnmatch(exclude, pathname+baselen,
 239                                             FNM_PATHNAME) == 0)
 240                                         return to_exclude;
 241                         }
 242                 }
 243         }
 244         return -1; /* undecided */
 245 }
 246
 247 int excluded(struct dir_struct *dir, const char *pathname)
 248 {
 249         int pathlen = strlen(pathname);
 250         int st;
 251
 252         for (st = EXC_CMDL; st <= EXC_FILE; st++) {
 253                 switch (excluded_1(pathname, pathlen, &dir->exclude_list[st])) {
 254                 case 0:
 255                         return 0;
 256                 case 1:
 257                         return 1;
 258                 }
 259         }
 260         return 0;
 261 }
 262
 263 struct dir_entry *dir_add_name(struct dir_struct *dir, const char *pathname, int len)
 264 {
 265         struct dir_entry *ent;
 266
 267         if (cache_name_pos(pathname, len) >= 0)
 268                 return NULL;
 269
 270         if (dir->nr == dir->alloc) {
 271                 int alloc = alloc_nr(dir->alloc);
 272                 dir->alloc = alloc;
 273                 dir->entries = xrealloc(dir->entries, alloc*sizeof(ent));
 274         }
 275         ent = xmalloc(sizeof(*ent) + len + 1);
 276         ent->ignored = ent->ignored_dir = 0;
 277         ent->len = len;
 278         memcpy(ent->name, pathname, len);
 279         ent->name[len] = 0;
 280         dir->entries[dir->nr++] = ent;
 281         return ent;
 282 }
 283
 284 static int dir_exists(const char *dirname, int len)
 285 {
 286         int pos = cache_name_pos(dirname, len);
 287         if (pos >= 0)
 288                 return 1;
 289         pos = -pos-1;
 290         if (pos >= active_nr) /* can't */
 291                 return 0;
 292         return !strncmp(active_cache[pos]->name, dirname, len);
 293 }
 294
 295 /*
 296  * Read a directory tree. We currently ignore anything but
 297  * directories, regular files and symlinks. That's because git
 298  * doesn't handle them at all yet. Maybe that will change some
 299  * day.
 300  *
 301  * Also, we ignore the name ".git" (even if it is not a directory).
 302  * That likely will not change.
 303  */
 304 static int read_directory_recursive(struct dir_struct *dir, const char *path, const char *base, int baselen, int check_only)
 305 {
 306         DIR *fdir = opendir(path);
 307         int contents = 0;
 308
 309         if (fdir) {
 310                 int exclude_stk;
 311                 struct dirent *de;
 312                 char fullname[PATH_MAX + 1];
 313                 memcpy(fullname, base, baselen);
 314
 315                 exclude_stk = push_exclude_per_directory(dir, base, baselen);
 316
 317                 while ((de = readdir(fdir)) != NULL) {
 318                         int len;
 319
 320                         if ((de->d_name[0] == '.') &&
 321                             (de->d_name[1] == 0 ||
 322                              !strcmp(de->d_name + 1, ".") ||
 323                              !strcmp(de->d_name + 1, "git")))
 324                                 continue;
 325                         len = strlen(de->d_name);
 326                         memcpy(fullname + baselen, de->d_name, len+1);
 327                         if (excluded(dir, fullname) != dir->show_ignored) {
 328                                 if (!dir->show_ignored || DTYPE(de) != DT_DIR) {
 329                                         continue;
 330                                 }
 331                         }
 332
 333                         switch (DTYPE(de)) {
 334                         struct stat st;
 335                         default:
 336                                 continue;
 337                         case DT_UNKNOWN:
 338                                 if (lstat(fullname, &st))
 339                                         continue;
 340                                 if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 341                                         break;
 342                                 if (!S_ISDIR(st.st_mode))
 343                                         continue;
 344                                 /* fallthrough */
 345                         case DT_DIR:
 346                                 memcpy(fullname + baselen + len, "/", 2);
 347                                 len++;
 348                                 if (dir->show_other_directories &&
 349                                     !dir_exists(fullname, baselen + len)) {
 350                                         if (dir->hide_empty_directories &&
 351                                             !read_directory_recursive(dir,
 352                                                     fullname, fullname,
 353                                                     baselen + len, 1))
 354                                                 continue;
 355                                         break;
 356                                 }
 357
 358                                 contents += read_directory_recursive(dir,
 359                                         fullname, fullname, baselen + len, 0);
 360                                 continue;
 361                         case DT_REG:
 362                         case DT_LNK:
 363                                 break;
 364                         }
 365                         contents++;
 366                         if (check_only)
 367                                 goto exit_early;
 368                         else
 369                                 dir_add_name(dir, fullname, baselen + len);
 370                 }
 371 exit_early:
 372                 closedir(fdir);
 373
 374                 pop_exclude_per_directory(dir, exclude_stk);
 375         }
 376
 377         return contents;
 378 }
 379
 380 static int cmp_name(const void *p1, const void *p2)
 381 {
 382         const struct dir_entry *e1 = *(const struct dir_entry **)p1;
 383         const struct dir_entry *e2 = *(const struct dir_entry **)p2;
 384
 385         return cache_name_compare(e1->name, e1->len,
 386                                   e2->name, e2->len);
 387 }
 388
 389 int read_directory(struct dir_struct *dir, const char *path, const char *base, int baselen)
 390 {
 391         /*
 392          * Make sure to do the per-directory exclude for all the
 393          * directories leading up to our base.
 394          */
 395         if (baselen) {
 396                 if (dir->exclude_per_dir) {
 397                         char *p, *pp = xmalloc(baselen+1);
 398                         memcpy(pp, base, baselen+1);
 399                         p = pp;
 400                         while (1) {
 401                                 char save = *p;
 402                                 *p = 0;
 403                                 push_exclude_per_directory(dir, pp, p-pp);
 404                                 *p++ = save;
 405                                 if (!save)
 406                                         break;
 407                                 p = strchr(p, '/');
 408                                 if (p)
 409                                         p++;
 410                                 else
 411                                         p = pp + baselen;
 412                         }
 413                         free(pp);
 414                 }
 415         }
 416
 417         read_directory_recursive(dir, path, base, baselen, 0);
 418         qsort(dir->entries, dir->nr, sizeof(struct dir_entry *), cmp_name);
 419         return dir->nr;
 420 }
 421
 422 int
 423 file_exists(const char *f)
 424 {
 425   struct stat sb;
 426   return stat(f, &sb) == 0;
 427 }