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