4
const char git_attr__true[] = "(builtin)true";
5
const char git_attr__false[] = "\0(builtin)false";
6
static const char git_attr__unknown[] = "(builtin)unknown";
7
#define ATTR__TRUE git_attr__true
8
#define ATTR__FALSE git_attr__false
9
#define ATTR__UNSET NULL
10
#define ATTR__UNKNOWN git_attr__unknown
13
* The basic design decision here is that we are not going to have
14
* insanely large number of attributes.
16
* This is a randomly chosen prime.
25
struct git_attr *next;
28
char name[FLEX_ARRAY];
32
static struct git_attr_check *check_all_attr;
33
static struct git_attr *(git_attr_hash[HASHSIZE]);
35
static unsigned hash_name(const char *name, int namelen)
42
val = ((val << 7) | (val >> 22)) ^ c;
47
static int invalid_attr_name(const char *name, int namelen)
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"
59
if (! (ch == '-' || ch == '.' || ch == '_' ||
60
('0' <= ch && ch <= '9') ||
61
('a' <= ch && ch <= 'z') ||
62
('A' <= ch && ch <= 'Z')) )
68
struct git_attr *git_attr(const char *name, int len)
70
unsigned hval = hash_name(name, len);
71
unsigned pos = hval % HASHSIZE;
74
for (a = git_attr_hash[pos]; a; a = a->next) {
76
!memcmp(a->name, name, len) && !a->name[len])
80
if (invalid_attr_name(name, len))
83
a = xmalloc(sizeof(*a) + len + 1);
84
memcpy(a->name, name, len);
87
a->next = git_attr_hash[pos];
88
a->attr_nr = attr_nr++;
89
git_attr_hash[pos] = a;
91
check_all_attr = xrealloc(check_all_attr,
92
sizeof(*check_all_attr) * attr_nr);
93
check_all_attr[a->attr_nr].attr = a;
94
check_all_attr[a->attr_nr].value = ATTR__UNKNOWN;
99
* .gitattributes file is one line per record, each of which is
103
* (3) whitespace separated list of attribute names, each of which
104
* could be prefixed with '-' to mean "set to false", '!' to mean
108
/* What does a matched pattern decide? */
110
struct git_attr *attr;
117
struct git_attr *attr;
121
struct attr_state state[FLEX_ARRAY];
124
static const char blank[] = " \t\r\n";
126
static const char *parse_attr(const char *src, int lineno, const char *cp,
127
int *num_attr, struct match_attr *res)
129
const char *ep, *equals;
132
ep = cp + strcspn(cp, blank);
133
equals = strchr(cp, '=');
134
if (equals && ep < equals)
141
if (*cp == '-' || *cp == '!') {
145
if (invalid_attr_name(cp, len)) {
147
"%.*s is not a valid attribute name: %s:%d\n",
148
len, cp, src, lineno);
152
struct attr_state *e;
154
e = &(res->state[*num_attr]);
155
if (*cp == '-' || *cp == '!') {
156
e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
161
e->setto = ATTR__TRUE;
164
int vallen = ep - equals;
165
value = xmalloc(vallen);
166
memcpy(value, equals+1, vallen-1);
170
e->attr = git_attr(cp, len);
173
return ep + strspn(ep, blank);
176
static struct match_attr *parse_attr_line(const char *line, const char *src,
177
int lineno, int macro_ok)
181
const char *cp, *name;
182
struct match_attr *res = NULL;
186
cp = line + strspn(line, blank);
187
if (!*cp || *cp == '#')
190
namelen = strcspn(name, blank);
191
if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
192
!prefixcmp(name, ATTRIBUTE_MACRO_PREFIX)) {
194
fprintf(stderr, "%s not allowed: %s:%d\n",
199
name += strlen(ATTRIBUTE_MACRO_PREFIX);
200
name += strspn(name, blank);
201
namelen = strcspn(name, blank);
202
if (invalid_attr_name(name, namelen)) {
204
"%.*s is not a valid attribute name: %s:%d\n",
205
namelen, name, src, lineno);
212
for (pass = 0; pass < 2; pass++) {
213
/* pass 0 counts and allocates, pass 1 fills */
216
cp = cp + strspn(cp, blank);
218
cp = parse_attr(src, lineno, cp, &num_attr, res);
223
sizeof(struct attr_state) * num_attr +
224
(is_macro ? 0 : namelen + 1));
226
res->u.attr = git_attr(name, namelen);
228
res->u.pattern = (char*)&(res->state[num_attr]);
229
memcpy(res->u.pattern, name, namelen);
230
res->u.pattern[namelen] = 0;
232
res->is_macro = is_macro;
233
res->num_attr = num_attr;
239
* Like info/exclude and .gitignore, the attribute information can
240
* come from many places.
242
* (1) .gitattribute file of the same directory;
243
* (2) .gitattribute file of the parent directory if (1) does not have
244
* any match; this goes recursively upwards, just like .gitignore.
245
* (3) $GIT_DIR/info/attributes, which overrides both of the above.
247
* In the same file, later entries override the earlier match, so in the
248
* global list, we would have entries from info/attributes the earliest
249
* (reading the file from top to bottom), .gitattribute of the root
250
* directory (again, reading the file from top to bottom) down to the
251
* current directory, and then scan the list backwards to find the first match.
252
* This is exactly the same as what excluded() does in dir.c to deal with
256
static struct attr_stack {
257
struct attr_stack *prev;
259
unsigned num_matches;
260
struct match_attr **attrs;
263
static void free_attr_elem(struct attr_stack *e)
267
for (i = 0; i < e->num_matches; i++) {
268
struct match_attr *a = e->attrs[i];
270
for (j = 0; j < a->num_attr; j++) {
271
const char *setto = a->state[j].setto;
272
if (setto == ATTR__TRUE ||
273
setto == ATTR__FALSE ||
274
setto == ATTR__UNSET ||
275
setto == ATTR__UNKNOWN)
285
static const char *builtin_attr[] = {
286
"[attr]binary -diff -crlf",
290
static struct attr_stack *read_attr_from_array(const char **list)
292
struct attr_stack *res;
296
res = xcalloc(1, sizeof(*res));
297
while ((line = *(list++)) != NULL) {
298
struct match_attr *a;
300
a = parse_attr_line(line, "[builtin]", ++lineno, 1);
303
res->attrs = xrealloc(res->attrs,
304
sizeof(struct match_attr *) * (res->num_matches + 1));
305
res->attrs[res->num_matches++] = a;
310
static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
313
struct attr_stack *res;
317
res = xcalloc(1, sizeof(*res));
318
fp = fopen(path, "r");
322
while (fgets(buf, sizeof(buf), fp)) {
323
struct match_attr *a;
325
a = parse_attr_line(buf, path, ++lineno, macro_ok);
328
res->attrs = xrealloc(res->attrs,
329
sizeof(struct match_attr *) * (res->num_matches + 1));
330
res->attrs[res->num_matches++] = a;
337
static void debug_info(const char *what, struct attr_stack *elem)
339
fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()");
341
static void debug_set(const char *what, const char *match, struct git_attr *attr, void *v)
343
const char *value = v;
345
if (ATTR_TRUE(value))
347
else if (ATTR_FALSE(value))
349
else if (ATTR_UNSET(value))
350
value = "unspecified";
352
fprintf(stderr, "%s: %s => %s (%s)\n",
353
what, attr->name, (char *) value, match);
355
#define debug_push(a) debug_info("push", (a))
356
#define debug_pop(a) debug_info("pop", (a))
358
#define debug_push(a) do { ; } while (0)
359
#define debug_pop(a) do { ; } while (0)
360
#define debug_set(a,b,c,d) do { ; } while (0)
363
static void bootstrap_attr_stack(void)
366
struct attr_stack *elem;
368
elem = read_attr_from_array(builtin_attr);
370
elem->prev = attr_stack;
373
elem = read_attr_from_file(GITATTRIBUTES_FILE, 1);
374
elem->origin = strdup("");
375
elem->prev = attr_stack;
379
elem = read_attr_from_file(git_path(INFOATTRIBUTES_FILE), 1);
381
elem->prev = attr_stack;
386
static void prepare_attr_stack(const char *path, int dirlen)
388
struct attr_stack *elem, *info;
390
char pathbuf[PATH_MAX];
393
* At the bottom of the attribute stack is the built-in
394
* set of attribute definitions. Then, contents from
395
* .gitattribute files from directories closer to the
396
* root to the ones in deeper directories are pushed
397
* to the stack. Finally, at the very top of the stack
398
* we always keep the contents of $GIT_DIR/info/attributes.
400
* When checking, we use entries from near the top of the
401
* stack, preferring $GIT_DIR/info/attributes, then
402
* .gitattributes in deeper directories to shallower ones,
403
* and finally use the built-in set as the default.
406
bootstrap_attr_stack();
409
* Pop the "info" one that is always at the top of the stack.
412
attr_stack = info->prev;
415
* Pop the ones from directories that are not the prefix of
416
* the path we are checking.
418
while (attr_stack && attr_stack->origin) {
419
int namelen = strlen(attr_stack->origin);
422
if (namelen <= dirlen &&
423
!strncmp(elem->origin, path, namelen))
427
attr_stack = elem->prev;
428
free_attr_elem(elem);
432
* Read from parent directories and push them down
437
len = strlen(attr_stack->origin);
440
memcpy(pathbuf, path, dirlen);
441
memcpy(pathbuf + dirlen, "/", 2);
442
cp = strchr(pathbuf + len + 1, '/');
443
strcpy(cp + 1, GITATTRIBUTES_FILE);
444
elem = read_attr_from_file(pathbuf, 0);
446
elem->origin = strdup(pathbuf);
447
elem->prev = attr_stack;
453
* Finally push the "info" one at the top of the stack.
455
info->prev = attr_stack;
459
static int path_matches(const char *pathname, int pathlen,
461
const char *base, int baselen)
463
if (!strchr(pattern, '/')) {
465
const char *basename = strrchr(pathname, '/');
466
basename = basename ? basename + 1 : pathname;
467
return (fnmatch(pattern, basename, 0) == 0);
470
* match with FNM_PATHNAME; the pattern has base implicitly
475
if (pathlen < baselen ||
476
(baselen && pathname[baselen - 1] != '/') ||
477
strncmp(pathname, base, baselen))
479
return fnmatch(pattern, pathname + baselen, FNM_PATHNAME) == 0;
482
static int fill_one(const char *what, struct match_attr *a, int rem)
484
struct git_attr_check *check = check_all_attr;
487
for (i = 0; 0 < rem && i < a->num_attr; i++) {
488
struct git_attr *attr = a->state[i].attr;
489
const char **n = &(check[attr->attr_nr].value);
490
const char *v = a->state[i].setto;
492
if (*n == ATTR__UNKNOWN) {
493
debug_set(what, a->u.pattern, attr, v);
501
static int fill(const char *path, int pathlen, struct attr_stack *stk, int rem)
504
const char *base = stk->origin ? stk->origin : "";
506
for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
507
struct match_attr *a = stk->attrs[i];
510
if (path_matches(path, pathlen,
511
a->u.pattern, base, strlen(base)))
512
rem = fill_one("fill", a, rem);
517
static int macroexpand(struct attr_stack *stk, int rem)
520
struct git_attr_check *check = check_all_attr;
522
for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
523
struct match_attr *a = stk->attrs[i];
526
if (check[a->u.attr->attr_nr].value != ATTR__TRUE)
528
rem = fill_one("expand", a, rem);
533
int git_checkattr(const char *path, int num, struct git_attr_check *check)
535
struct attr_stack *stk;
537
int dirlen, pathlen, i, rem;
539
bootstrap_attr_stack();
540
for (i = 0; i < attr_nr; i++)
541
check_all_attr[i].value = ATTR__UNKNOWN;
543
pathlen = strlen(path);
544
cp = strrchr(path, '/');
549
prepare_attr_stack(path, dirlen);
551
for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
552
rem = fill(path, pathlen, stk, rem);
554
for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
555
rem = macroexpand(stk, rem);
557
for (i = 0; i < num; i++) {
558
const char *value = check_all_attr[check[i].attr->attr_nr].value;
559
if (value == ATTR__UNKNOWN)
561
check[i].value = value;