attr: Allow multiple changes to an attribute on the same line.
[git/git.git] / attr.c
CommitLineData
06f33c17 1#define NO_THE_INDEX_COMPATIBILITY_MACROS
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2#include "cache.h"
3#include "attr.h"
4
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5const char git_attr__true[] = "(builtin)true";
6const char git_attr__false[] = "\0(builtin)false";
7static const char git_attr__unknown[] = "(builtin)unknown";
8#define ATTR__TRUE git_attr__true
9#define ATTR__FALSE git_attr__false
10#define ATTR__UNSET NULL
11#define ATTR__UNKNOWN git_attr__unknown
515106fa 12
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13/*
14 * The basic design decision here is that we are not going to have
15 * insanely large number of attributes.
16 *
17 * This is a randomly chosen prime.
18 */
19#define HASHSIZE 257
20
21#ifndef DEBUG_ATTR
22#define DEBUG_ATTR 0
23#endif
24
25struct git_attr {
26 struct git_attr *next;
27 unsigned h;
f48fd688 28 int attr_nr;
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29 char name[FLEX_ARRAY];
30};
f48fd688 31static int attr_nr;
d0bfd026 32
f48fd688 33static struct git_attr_check *check_all_attr;
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34static struct git_attr *(git_attr_hash[HASHSIZE]);
35
36static unsigned hash_name(const char *name, int namelen)
37{
48fb7deb 38 unsigned val = 0, c;
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39
40 while (namelen--) {
41 c = *name++;
42 val = ((val << 7) | (val >> 22)) ^ c;
43 }
44 return val;
45}
46
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47static int invalid_attr_name(const char *name, int namelen)
48{
49 /*
50 * Attribute name cannot begin with '-' and from
51 * [-A-Za-z0-9_.]. We'd specifically exclude '=' for now,
52 * as we might later want to allow non-binary value for
53 * attributes, e.g. "*.svg merge=special-merge-program-for-svg"
54 */
55 if (*name == '-')
56 return -1;
57 while (namelen--) {
58 char ch = *name++;
59 if (! (ch == '-' || ch == '.' || ch == '_' ||
60 ('0' <= ch && ch <= '9') ||
61 ('a' <= ch && ch <= 'z') ||
62 ('A' <= ch && ch <= 'Z')) )
63 return -1;
64 }
65 return 0;
66}
67
7fb0eaa2 68static struct git_attr *git_attr_internal(const char *name, int len)
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69{
70 unsigned hval = hash_name(name, len);
71 unsigned pos = hval % HASHSIZE;
72 struct git_attr *a;
73
74 for (a = git_attr_hash[pos]; a; a = a->next) {
75 if (a->h == hval &&
76 !memcmp(a->name, name, len) && !a->name[len])
77 return a;
78 }
79
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80 if (invalid_attr_name(name, len))
81 return NULL;
82
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83 a = xmalloc(sizeof(*a) + len + 1);
84 memcpy(a->name, name, len);
85 a->name[len] = 0;
86 a->h = hval;
87 a->next = git_attr_hash[pos];
f48fd688 88 a->attr_nr = attr_nr++;
d0bfd026 89 git_attr_hash[pos] = a;
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90
91 check_all_attr = xrealloc(check_all_attr,
92 sizeof(*check_all_attr) * attr_nr);
93 check_all_attr[a->attr_nr].attr = a;
515106fa 94 check_all_attr[a->attr_nr].value = ATTR__UNKNOWN;
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95 return a;
96}
97
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98struct git_attr *git_attr(const char *name)
99{
100 return git_attr_internal(name, strlen(name));
101}
102
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103/*
104 * .gitattributes file is one line per record, each of which is
105 *
106 * (1) glob pattern.
107 * (2) whitespace
108 * (3) whitespace separated list of attribute names, each of which
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109 * could be prefixed with '-' to mean "set to false", '!' to mean
110 * "unset".
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111 */
112
515106fa 113/* What does a matched pattern decide? */
d0bfd026 114struct attr_state {
d0bfd026 115 struct git_attr *attr;
a5e92abd 116 const char *setto;
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117};
118
119struct match_attr {
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120 union {
121 char *pattern;
122 struct git_attr *attr;
123 } u;
124 char is_macro;
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125 unsigned num_attr;
126 struct attr_state state[FLEX_ARRAY];
127};
128
129static const char blank[] = " \t\r\n";
130
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131static const char *parse_attr(const char *src, int lineno, const char *cp,
132 int *num_attr, struct match_attr *res)
133{
134 const char *ep, *equals;
135 int len;
136
137 ep = cp + strcspn(cp, blank);
138 equals = strchr(cp, '=');
139 if (equals && ep < equals)
140 equals = NULL;
141 if (equals)
142 len = equals - cp;
143 else
144 len = ep - cp;
145 if (!res) {
146 if (*cp == '-' || *cp == '!') {
147 cp++;
148 len--;
149 }
150 if (invalid_attr_name(cp, len)) {
151 fprintf(stderr,
152 "%.*s is not a valid attribute name: %s:%d\n",
153 len, cp, src, lineno);
154 return NULL;
155 }
156 } else {
157 struct attr_state *e;
158
159 e = &(res->state[*num_attr]);
160 if (*cp == '-' || *cp == '!') {
161 e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
162 cp++;
163 len--;
164 }
165 else if (!equals)
166 e->setto = ATTR__TRUE;
167 else {
182af834 168 e->setto = xmemdupz(equals + 1, ep - equals - 1);
515106fa 169 }
7fb0eaa2 170 e->attr = git_attr_internal(cp, len);
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171 }
172 (*num_attr)++;
173 return ep + strspn(ep, blank);
174}
175
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176static struct match_attr *parse_attr_line(const char *line, const char *src,
177 int lineno, int macro_ok)
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178{
179 int namelen;
180 int num_attr;
181 const char *cp, *name;
515106fa 182 struct match_attr *res = NULL;
d0bfd026 183 int pass;
f48fd688 184 int is_macro;
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185
186 cp = line + strspn(line, blank);
187 if (!*cp || *cp == '#')
188 return NULL;
189 name = cp;
190 namelen = strcspn(name, blank);
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191 if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
192 !prefixcmp(name, ATTRIBUTE_MACRO_PREFIX)) {
193 if (!macro_ok) {
194 fprintf(stderr, "%s not allowed: %s:%d\n",
195 name, src, lineno);
196 return NULL;
197 }
198 is_macro = 1;
199 name += strlen(ATTRIBUTE_MACRO_PREFIX);
200 name += strspn(name, blank);
201 namelen = strcspn(name, blank);
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202 if (invalid_attr_name(name, namelen)) {
203 fprintf(stderr,
204 "%.*s is not a valid attribute name: %s:%d\n",
205 namelen, name, src, lineno);
206 return NULL;
207 }
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208 }
209 else
210 is_macro = 0;
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211
212 for (pass = 0; pass < 2; pass++) {
213 /* pass 0 counts and allocates, pass 1 fills */
214 num_attr = 0;
215 cp = name + namelen;
216 cp = cp + strspn(cp, blank);
d7b0a093 217 while (*cp) {
515106fa 218 cp = parse_attr(src, lineno, cp, &num_attr, res);
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219 if (!cp)
220 return NULL;
221 }
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222 if (pass)
223 break;
224 res = xcalloc(1,
225 sizeof(*res) +
226 sizeof(struct attr_state) * num_attr +
f48fd688 227 (is_macro ? 0 : namelen + 1));
515106fa 228 if (is_macro)
7fb0eaa2 229 res->u.attr = git_attr_internal(name, namelen);
f48fd688 230 else {
4b25d091 231 res->u.pattern = (char *)&(res->state[num_attr]);
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232 memcpy(res->u.pattern, name, namelen);
233 res->u.pattern[namelen] = 0;
234 }
235 res->is_macro = is_macro;
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236 res->num_attr = num_attr;
237 }
238 return res;
239}
240
241/*
242 * Like info/exclude and .gitignore, the attribute information can
243 * come from many places.
244 *
245 * (1) .gitattribute file of the same directory;
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246 * (2) .gitattribute file of the parent directory if (1) does not have
247 * any match; this goes recursively upwards, just like .gitignore.
248 * (3) $GIT_DIR/info/attributes, which overrides both of the above.
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249 *
250 * In the same file, later entries override the earlier match, so in the
251 * global list, we would have entries from info/attributes the earliest
252 * (reading the file from top to bottom), .gitattribute of the root
253 * directory (again, reading the file from top to bottom) down to the
254 * current directory, and then scan the list backwards to find the first match.
255 * This is exactly the same as what excluded() does in dir.c to deal with
256 * .gitignore
257 */
258
259static struct attr_stack {
260 struct attr_stack *prev;
261 char *origin;
262 unsigned num_matches;
a4413118 263 unsigned alloc;
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264 struct match_attr **attrs;
265} *attr_stack;
266
267static void free_attr_elem(struct attr_stack *e)
268{
269 int i;
270 free(e->origin);
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271 for (i = 0; i < e->num_matches; i++) {
272 struct match_attr *a = e->attrs[i];
273 int j;
274 for (j = 0; j < a->num_attr; j++) {
a5e92abd 275 const char *setto = a->state[j].setto;
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276 if (setto == ATTR__TRUE ||
277 setto == ATTR__FALSE ||
278 setto == ATTR__UNSET ||
279 setto == ATTR__UNKNOWN)
280 ;
281 else
4b25d091 282 free((char *) setto);
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283 }
284 free(a);
285 }
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286 free(e);
287}
288
289static const char *builtin_attr[] = {
e4aee10a 290 "[attr]binary -diff -crlf",
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291 NULL,
292};
293
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294static void handle_attr_line(struct attr_stack *res,
295 const char *line,
296 const char *src,
297 int lineno,
298 int macro_ok)
299{
300 struct match_attr *a;
301
302 a = parse_attr_line(line, src, lineno, macro_ok);
303 if (!a)
304 return;
305 if (res->alloc <= res->num_matches) {
306 res->alloc = alloc_nr(res->num_matches);
307 res->attrs = xrealloc(res->attrs,
308 sizeof(struct match_attr *) *
309 res->alloc);
310 }
311 res->attrs[res->num_matches++] = a;
312}
313
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314static struct attr_stack *read_attr_from_array(const char **list)
315{
316 struct attr_stack *res;
317 const char *line;
f48fd688 318 int lineno = 0;
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319
320 res = xcalloc(1, sizeof(*res));
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321 while ((line = *(list++)) != NULL)
322 handle_attr_line(res, line, "[builtin]", ++lineno, 1);
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323 return res;
324}
325
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326static enum git_attr_direction direction;
327static struct index_state *use_index;
328
f48fd688 329static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
d0bfd026 330{
a4413118 331 FILE *fp = fopen(path, "r");
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332 struct attr_stack *res;
333 char buf[2048];
f48fd688 334 int lineno = 0;
d0bfd026 335
d0bfd026 336 if (!fp)
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337 return NULL;
338 res = xcalloc(1, sizeof(*res));
339 while (fgets(buf, sizeof(buf), fp))
340 handle_attr_line(res, buf, path, ++lineno, macro_ok);
341 fclose(fp);
342 return res;
343}
d0bfd026 344
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345static void *read_index_data(const char *path)
346{
347 int pos, len;
348 unsigned long sz;
349 enum object_type type;
350 void *data;
06f33c17 351 struct index_state *istate = use_index ? use_index : &the_index;
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352
353 len = strlen(path);
06f33c17 354 pos = index_name_pos(istate, path, len);
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355 if (pos < 0) {
356 /*
357 * We might be in the middle of a merge, in which
358 * case we would read stage #2 (ours).
359 */
360 int i;
361 for (i = -pos - 1;
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362 (pos < 0 && i < istate->cache_nr &&
363 !strcmp(istate->cache[i]->name, path));
1a9d7e9b 364 i++)
06f33c17 365 if (ce_stage(istate->cache[i]) == 2)
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366 pos = i;
367 }
368 if (pos < 0)
369 return NULL;
06f33c17 370 data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
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371 if (!data || type != OBJ_BLOB) {
372 free(data);
373 return NULL;
374 }
375 return data;
376}
377
06f33c17 378static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
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379{
380 struct attr_stack *res;
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381 char *buf, *sp;
382 int lineno = 0;
f48fd688 383
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384 buf = read_index_data(path);
385 if (!buf)
06f33c17 386 return NULL;
1a9d7e9b 387
06f33c17 388 res = xcalloc(1, sizeof(*res));
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389 for (sp = buf; *sp; ) {
390 char *ep;
391 int more;
392 for (ep = sp; *ep && *ep != '\n'; ep++)
393 ;
394 more = (*ep == '\n');
395 *ep = '\0';
396 handle_attr_line(res, sp, path, ++lineno, macro_ok);
397 sp = ep + more;
398 }
399 free(buf);
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400 return res;
401}
402
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403static struct attr_stack *read_attr(const char *path, int macro_ok)
404{
405 struct attr_stack *res;
406
407 if (direction == GIT_ATTR_CHECKOUT) {
408 res = read_attr_from_index(path, macro_ok);
409 if (!res)
410 res = read_attr_from_file(path, macro_ok);
411 }
4191e80a 412 else if (direction == GIT_ATTR_CHECKIN) {
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413 res = read_attr_from_file(path, macro_ok);
414 if (!res)
415 /*
416 * There is no checked out .gitattributes file there, but
417 * we might have it in the index. We allow operation in a
418 * sparsely checked out work tree, so read from it.
419 */
420 res = read_attr_from_index(path, macro_ok);
421 }
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422 else
423 res = read_attr_from_index(path, macro_ok);
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424 if (!res)
425 res = xcalloc(1, sizeof(*res));
426 return res;
427}
428
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429#if DEBUG_ATTR
430static void debug_info(const char *what, struct attr_stack *elem)
431{
432 fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()");
433}
cf94ccda 434static void debug_set(const char *what, const char *match, struct git_attr *attr, const void *v)
f48fd688 435{
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436 const char *value = v;
437
438 if (ATTR_TRUE(value))
439 value = "set";
440 else if (ATTR_FALSE(value))
441 value = "unset";
442 else if (ATTR_UNSET(value))
443 value = "unspecified";
444
445 fprintf(stderr, "%s: %s => %s (%s)\n",
446 what, attr->name, (char *) value, match);
f48fd688 447}
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448#define debug_push(a) debug_info("push", (a))
449#define debug_pop(a) debug_info("pop", (a))
450#else
451#define debug_push(a) do { ; } while (0)
452#define debug_pop(a) do { ; } while (0)
f48fd688 453#define debug_set(a,b,c,d) do { ; } while (0)
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454#endif
455
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456static void drop_attr_stack(void)
457{
458 while (attr_stack) {
459 struct attr_stack *elem = attr_stack;
460 attr_stack = elem->prev;
461 free_attr_elem(elem);
462 }
463}
464
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465static void bootstrap_attr_stack(void)
466{
467 if (!attr_stack) {
468 struct attr_stack *elem;
469
470 elem = read_attr_from_array(builtin_attr);
471 elem->origin = NULL;
472 elem->prev = attr_stack;
473 attr_stack = elem;
474
4191e80a 475 if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
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476 elem = read_attr(GITATTRIBUTES_FILE, 1);
477 elem->origin = strdup("");
478 elem->prev = attr_stack;
479 attr_stack = elem;
480 debug_push(elem);
481 }
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482
483 elem = read_attr_from_file(git_path(INFOATTRIBUTES_FILE), 1);
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484 if (!elem)
485 elem = xcalloc(1, sizeof(*elem));
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486 elem->origin = NULL;
487 elem->prev = attr_stack;
488 attr_stack = elem;
489 }
490}
491
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492static void prepare_attr_stack(const char *path, int dirlen)
493{
494 struct attr_stack *elem, *info;
495 int len;
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496 struct strbuf pathbuf;
497
498 strbuf_init(&pathbuf, dirlen+2+strlen(GITATTRIBUTES_FILE));
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499
500 /*
501 * At the bottom of the attribute stack is the built-in
502 * set of attribute definitions. Then, contents from
503 * .gitattribute files from directories closer to the
504 * root to the ones in deeper directories are pushed
505 * to the stack. Finally, at the very top of the stack
506 * we always keep the contents of $GIT_DIR/info/attributes.
507 *
508 * When checking, we use entries from near the top of the
509 * stack, preferring $GIT_DIR/info/attributes, then
510 * .gitattributes in deeper directories to shallower ones,
511 * and finally use the built-in set as the default.
512 */
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513 if (!attr_stack)
514 bootstrap_attr_stack();
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515
516 /*
517 * Pop the "info" one that is always at the top of the stack.
518 */
519 info = attr_stack;
520 attr_stack = info->prev;
521
522 /*
523 * Pop the ones from directories that are not the prefix of
524 * the path we are checking.
525 */
526 while (attr_stack && attr_stack->origin) {
527 int namelen = strlen(attr_stack->origin);
528
529 elem = attr_stack;
530 if (namelen <= dirlen &&
531 !strncmp(elem->origin, path, namelen))
532 break;
533
534 debug_pop(elem);
535 attr_stack = elem->prev;
536 free_attr_elem(elem);
537 }
538
539 /*
540 * Read from parent directories and push them down
541 */
4191e80a 542 if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
2d35d556
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543 while (1) {
544 char *cp;
545
546 len = strlen(attr_stack->origin);
547 if (dirlen <= len)
548 break;
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DP
549 strbuf_reset(&pathbuf);
550 strbuf_add(&pathbuf, path, dirlen);
551 strbuf_addch(&pathbuf, '/');
552 cp = strchr(pathbuf.buf + len + 1, '/');
2d35d556 553 strcpy(cp + 1, GITATTRIBUTES_FILE);
f66cf96d 554 elem = read_attr(pathbuf.buf, 0);
2d35d556 555 *cp = '\0';
f66cf96d 556 elem->origin = strdup(pathbuf.buf);
2d35d556
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557 elem->prev = attr_stack;
558 attr_stack = elem;
559 debug_push(elem);
560 }
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561 }
562
d4c98565
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563 strbuf_release(&pathbuf);
564
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565 /*
566 * Finally push the "info" one at the top of the stack.
567 */
568 info->prev = attr_stack;
569 attr_stack = info;
570}
571
572static int path_matches(const char *pathname, int pathlen,
573 const char *pattern,
574 const char *base, int baselen)
575{
576 if (!strchr(pattern, '/')) {
577 /* match basename */
578 const char *basename = strrchr(pathname, '/');
579 basename = basename ? basename + 1 : pathname;
580 return (fnmatch(pattern, basename, 0) == 0);
581 }
582 /*
583 * match with FNM_PATHNAME; the pattern has base implicitly
584 * in front of it.
585 */
586 if (*pattern == '/')
587 pattern++;
588 if (pathlen < baselen ||
cf94ccda 589 (baselen && pathname[baselen] != '/') ||
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590 strncmp(pathname, base, baselen))
591 return 0;
82881b38
MO
592 if (baselen != 0)
593 baselen++;
594 return fnmatch(pattern, pathname + baselen, FNM_PATHNAME) == 0;
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595}
596
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597static int fill_one(const char *what, struct match_attr *a, int rem)
598{
599 struct git_attr_check *check = check_all_attr;
600 int i;
601
969f9d73 602 for (i = a->num_attr - 1; 0 < rem && 0 <= i; i--) {
515106fa 603 struct git_attr *attr = a->state[i].attr;
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604 const char **n = &(check[attr->attr_nr].value);
605 const char *v = a->state[i].setto;
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606
607 if (*n == ATTR__UNKNOWN) {
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608 debug_set(what,
609 a->is_macro ? a->u.attr->name : a->u.pattern,
610 attr, v);
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611 *n = v;
612 rem--;
613 }
614 }
615 return rem;
616}
617
f48fd688 618static int fill(const char *path, int pathlen, struct attr_stack *stk, int rem)
d0bfd026 619{
515106fa 620 int i;
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621 const char *base = stk->origin ? stk->origin : "";
622
623 for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
624 struct match_attr *a = stk->attrs[i];
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625 if (a->is_macro)
626 continue;
d0bfd026 627 if (path_matches(path, pathlen,
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628 a->u.pattern, base, strlen(base)))
629 rem = fill_one("fill", a, rem);
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630 }
631 return rem;
632}
633
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634static int macroexpand(struct attr_stack *stk, int rem)
635{
515106fa 636 int i;
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637 struct git_attr_check *check = check_all_attr;
638
639 for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
640 struct match_attr *a = stk->attrs[i];
641 if (!a->is_macro)
642 continue;
515106fa 643 if (check[a->u.attr->attr_nr].value != ATTR__TRUE)
f48fd688 644 continue;
515106fa 645 rem = fill_one("expand", a, rem);
f48fd688
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646 }
647 return rem;
648}
649
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650int git_checkattr(const char *path, int num, struct git_attr_check *check)
651{
652 struct attr_stack *stk;
653 const char *cp;
654 int dirlen, pathlen, i, rem;
655
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656 bootstrap_attr_stack();
657 for (i = 0; i < attr_nr; i++)
515106fa 658 check_all_attr[i].value = ATTR__UNKNOWN;
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659
660 pathlen = strlen(path);
661 cp = strrchr(path, '/');
662 if (!cp)
663 dirlen = 0;
664 else
665 dirlen = cp - path;
666 prepare_attr_stack(path, dirlen);
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667 rem = attr_nr;
668 for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
669 rem = fill(path, pathlen, stk, rem);
670
d0bfd026 671 for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
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672 rem = macroexpand(stk, rem);
673
515106fa 674 for (i = 0; i < num; i++) {
a5e92abd 675 const char *value = check_all_attr[check[i].attr->attr_nr].value;
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676 if (value == ATTR__UNKNOWN)
677 value = ATTR__UNSET;
678 check[i].value = value;
679 }
f48fd688 680
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681 return 0;
682}
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683
684void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate)
685{
686 enum git_attr_direction old = direction;
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687
688 if (is_bare_repository() && new != GIT_ATTR_INDEX)
689 die("BUG: non-INDEX attr direction in a bare repo");
690
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691 direction = new;
692 if (new != old)
693 drop_attr_stack();
694 use_index = istate;
695}