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"
10int common_prefix(const char **pathspec)
12{
13 const char *path, *slash, *next;
14 int prefix;
15 if (!pathspec)
17 return 0;
18 path = *pathspec;
20 slash = strrchr(path, '/');
21 if (!slash)
22 return 0;
23 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/*
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 */
55static int match_one(const char *match, const char *name, int namelen)
56{
57 int matchlen;
58 /* If the match was just the prefix, we matched */
60 matchlen = strlen(match);
61 if (!matchlen)
62 return MATCHED_RECURSIVELY;
63 /*
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 if (!name[matchlen])
72 return MATCHED_EXACTLY;
73 if (match[matchlen-1] == '/' || name[matchlen] == '/')
74 return MATCHED_RECURSIVELY;
75 return 0;
76}
77/*
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 */
86int match_pathspec(const char **pathspec, const char *name, int namelen, int prefix, char *seen)
87{
88 int retval;
89 const char *match;
90 name += prefix;
92 namelen -= prefix;
93 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}
109void add_exclude(const char *string, const char *base,
111 int baselen, struct exclude_list *which)
112{
113 struct exclude *x = xmalloc(sizeof (*x));
114 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}
125static 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 long size;
134 char *buf, *entry;
135 fd = open(fname, O_RDONLY);
137 if (fd < 0 || fstat(fd, &st) < 0)
138 goto err;
139 size = st.st_size;
140 if (size == 0) {
141 close(fd);
142 return 0;
143 }
144 buf = xmalloc(size+1);
145 if (read(fd, buf, size) != size)
146 goto err;
147 close(fd);
148 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 err:
163 if (0 <= fd)
164 close(fd);
165 return -1;
166}
167void 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}
174int 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 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}
188void pop_exclude_per_directory(struct dir_struct *dir, int stk)
190{
191 struct exclude_list *el = &dir->exclude_list[EXC_DIRS];
192 while (stk < el->nr)
194 free(el->excludes[--el->nr]);
195}
196/* Scan the list and let the last match determines the fate.
198 * Return 1 for exclude, 0 for include and -1 for undecided.
199 */
200static int excluded_1(const char *pathname,
201 int pathlen,
202 struct exclude_list *el)
203{
204 int i;
205 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 if (*exclude == '!') {
213 to_exclude = 0;
214 exclude++;
215 }
216 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 if (pathlen < baselen ||
234 (baselen && pathname[baselen-1] != '/') ||
235 strncmp(pathname, x->base, baselen))
236 continue;
237 if (fnmatch(exclude, pathname+baselen,
239 FNM_PATHNAME) == 0)
240 return to_exclude;
241 }
242 }
243 }
244 return -1; /* undecided */
245}
246int excluded(struct dir_struct *dir, const char *pathname)
248{
249 int pathlen = strlen(pathname);
250 int st;
251 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}
262struct dir_entry *dir_add_name(struct dir_struct *dir, const char *pathname, int len)
264{
265 struct dir_entry *ent;
266 if (cache_name_pos(pathname, len) >= 0)
268 return NULL;
269 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}
283static 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/*
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 */
304static 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 if (fdir) {
310 int exclude_stk;
311 struct dirent *de;
312 char fullname[PATH_MAX + 1];
313 memcpy(fullname, base, baselen);
314 exclude_stk = push_exclude_per_directory(dir, base, baselen);
316 while ((de = readdir(fdir)) != NULL) {
318 int len;
319 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 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 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 }
371exit_early:
372 closedir(fdir);
373 pop_exclude_per_directory(dir, exclude_stk);
375 }
376 return contents;
378}
379static 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 return cache_name_compare(e1->name, e1->len,
386 e2->name, e2->len);
387}
388int 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 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}
421int
423file_exists(const char *f)
424{
425 struct stat sb;
426 return stat(f, &sb) == 0;
427}