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
;
163 e
->setto
= xmemdupz(equals
+ 1, ep
- equals
- 1);
165 e
->attr
= git_attr(cp
, len
);
168 return ep
+ strspn(ep
, blank
);
171 static struct match_attr
*parse_attr_line(const char *line
, const char *src
,
172 int lineno
, int macro_ok
)
176 const char *cp
, *name
;
177 struct match_attr
*res
= NULL
;
181 cp
= line
+ strspn(line
, blank
);
182 if (!*cp
|| *cp
== '#')
185 namelen
= strcspn(name
, blank
);
186 if (strlen(ATTRIBUTE_MACRO_PREFIX
) < namelen
&&
187 !prefixcmp(name
, ATTRIBUTE_MACRO_PREFIX
)) {
189 fprintf(stderr
, "%s not allowed: %s:%d\n",
194 name
+= strlen(ATTRIBUTE_MACRO_PREFIX
);
195 name
+= strspn(name
, blank
);
196 namelen
= strcspn(name
, blank
);
197 if (invalid_attr_name(name
, namelen
)) {
199 "%.*s is not a valid attribute name: %s:%d\n",
200 namelen
, name
, src
, lineno
);
207 for (pass
= 0; pass
< 2; pass
++) {
208 /* pass 0 counts and allocates, pass 1 fills */
211 cp
= cp
+ strspn(cp
, blank
);
213 cp
= parse_attr(src
, lineno
, cp
, &num_attr
, res
);
221 sizeof(struct attr_state
) * num_attr
+
222 (is_macro
? 0 : namelen
+ 1));
224 res
->u
.attr
= git_attr(name
, namelen
);
226 res
->u
.pattern
= (char*)&(res
->state
[num_attr
]);
227 memcpy(res
->u
.pattern
, name
, namelen
);
228 res
->u
.pattern
[namelen
] = 0;
230 res
->is_macro
= is_macro
;
231 res
->num_attr
= num_attr
;
237 * Like info/exclude and .gitignore, the attribute information can
238 * come from many places.
240 * (1) .gitattribute file of the same directory;
241 * (2) .gitattribute file of the parent directory if (1) does not have
242 * any match; this goes recursively upwards, just like .gitignore.
243 * (3) $GIT_DIR/info/attributes, which overrides both of the above.
245 * In the same file, later entries override the earlier match, so in the
246 * global list, we would have entries from info/attributes the earliest
247 * (reading the file from top to bottom), .gitattribute of the root
248 * directory (again, reading the file from top to bottom) down to the
249 * current directory, and then scan the list backwards to find the first match.
250 * This is exactly the same as what excluded() does in dir.c to deal with
254 static struct attr_stack
{
255 struct attr_stack
*prev
;
257 unsigned num_matches
;
259 struct match_attr
**attrs
;
262 static void free_attr_elem(struct attr_stack
*e
)
266 for (i
= 0; i
< e
->num_matches
; i
++) {
267 struct match_attr
*a
= e
->attrs
[i
];
269 for (j
= 0; j
< a
->num_attr
; j
++) {
270 const char *setto
= a
->state
[j
].setto
;
271 if (setto
== ATTR__TRUE
||
272 setto
== ATTR__FALSE
||
273 setto
== ATTR__UNSET
||
274 setto
== ATTR__UNKNOWN
)
284 static const char *builtin_attr
[] = {
285 "[attr]binary -diff -crlf",
289 static void handle_attr_line(struct attr_stack
*res
,
295 struct match_attr
*a
;
297 a
= parse_attr_line(line
, src
, lineno
, macro_ok
);
300 if (res
->alloc
<= res
->num_matches
) {
301 res
->alloc
= alloc_nr(res
->num_matches
);
302 res
->attrs
= xrealloc(res
->attrs
,
303 sizeof(struct match_attr
*) *
306 res
->attrs
[res
->num_matches
++] = a
;
309 static struct attr_stack
*read_attr_from_array(const char **list
)
311 struct attr_stack
*res
;
315 res
= xcalloc(1, sizeof(*res
));
316 while ((line
= *(list
++)) != NULL
)
317 handle_attr_line(res
, line
, "[builtin]", ++lineno
, 1);
321 static struct attr_stack
*read_attr_from_file(const char *path
, int macro_ok
)
323 FILE *fp
= fopen(path
, "r");
324 struct attr_stack
*res
;
330 res
= xcalloc(1, sizeof(*res
));
331 while (fgets(buf
, sizeof(buf
), fp
))
332 handle_attr_line(res
, buf
, path
, ++lineno
, macro_ok
);
337 static void *read_index_data(const char *path
)
341 enum object_type type
;
345 pos
= cache_name_pos(path
, len
);
348 * We might be in the middle of a merge, in which
349 * case we would read stage #2 (ours).
353 (pos
< 0 && i
< active_nr
&&
354 !strcmp(active_cache
[i
]->name
, path
));
356 if (ce_stage(active_cache
[i
]) == 2)
361 data
= read_sha1_file(active_cache
[pos
]->sha1
, &type
, &sz
);
362 if (!data
|| type
!= OBJ_BLOB
) {
369 static struct attr_stack
*read_attr(const char *path
, int macro_ok
)
371 struct attr_stack
*res
;
375 res
= read_attr_from_file(path
, macro_ok
);
379 res
= xcalloc(1, sizeof(*res
));
382 * There is no checked out .gitattributes file there, but
383 * we might have it in the index. We allow operation in a
384 * sparsely checked out work tree, so read from it.
386 buf
= read_index_data(path
);
390 for (sp
= buf
; *sp
; ) {
393 for (ep
= sp
; *ep
&& *ep
!= '\n'; ep
++)
395 more
= (*ep
== '\n');
397 handle_attr_line(res
, sp
, path
, ++lineno
, macro_ok
);
405 static void debug_info(const char *what
, struct attr_stack
*elem
)
407 fprintf(stderr
, "%s: %s\n", what
, elem
->origin
? elem
->origin
: "()");
409 static void debug_set(const char *what
, const char *match
, struct git_attr
*attr
, const void *v
)
411 const char *value
= v
;
413 if (ATTR_TRUE(value
))
415 else if (ATTR_FALSE(value
))
417 else if (ATTR_UNSET(value
))
418 value
= "unspecified";
420 fprintf(stderr
, "%s: %s => %s (%s)\n",
421 what
, attr
->name
, (char *) value
, match
);
423 #define debug_push(a) debug_info("push", (a))
424 #define debug_pop(a) debug_info("pop", (a))
426 #define debug_push(a) do { ; } while (0)
427 #define debug_pop(a) do { ; } while (0)
428 #define debug_set(a,b,c,d) do { ; } while (0)
431 static void bootstrap_attr_stack(void)
434 struct attr_stack
*elem
;
436 elem
= read_attr_from_array(builtin_attr
);
438 elem
->prev
= attr_stack
;
441 if (!is_bare_repository()) {
442 elem
= read_attr(GITATTRIBUTES_FILE
, 1);
443 elem
->origin
= strdup("");
444 elem
->prev
= attr_stack
;
449 elem
= read_attr_from_file(git_path(INFOATTRIBUTES_FILE
), 1);
451 elem
= xcalloc(1, sizeof(*elem
));
453 elem
->prev
= attr_stack
;
458 static void prepare_attr_stack(const char *path
, int dirlen
)
460 struct attr_stack
*elem
, *info
;
462 struct strbuf pathbuf
;
464 strbuf_init(&pathbuf
, dirlen
+2+strlen(GITATTRIBUTES_FILE
));
467 * At the bottom of the attribute stack is the built-in
468 * set of attribute definitions. Then, contents from
469 * .gitattribute files from directories closer to the
470 * root to the ones in deeper directories are pushed
471 * to the stack. Finally, at the very top of the stack
472 * we always keep the contents of $GIT_DIR/info/attributes.
474 * When checking, we use entries from near the top of the
475 * stack, preferring $GIT_DIR/info/attributes, then
476 * .gitattributes in deeper directories to shallower ones,
477 * and finally use the built-in set as the default.
480 bootstrap_attr_stack();
483 * Pop the "info" one that is always at the top of the stack.
486 attr_stack
= info
->prev
;
489 * Pop the ones from directories that are not the prefix of
490 * the path we are checking.
492 while (attr_stack
&& attr_stack
->origin
) {
493 int namelen
= strlen(attr_stack
->origin
);
496 if (namelen
<= dirlen
&&
497 !strncmp(elem
->origin
, path
, namelen
))
501 attr_stack
= elem
->prev
;
502 free_attr_elem(elem
);
506 * Read from parent directories and push them down
508 if (!is_bare_repository()) {
512 len
= strlen(attr_stack
->origin
);
515 strbuf_reset(&pathbuf
);
516 strbuf_add(&pathbuf
, path
, dirlen
);
517 strbuf_addch(&pathbuf
, '/');
518 cp
= strchr(pathbuf
.buf
+ len
+ 1, '/');
519 strcpy(cp
+ 1, GITATTRIBUTES_FILE
);
520 elem
= read_attr(pathbuf
.buf
, 0);
522 elem
->origin
= strdup(pathbuf
.buf
);
523 elem
->prev
= attr_stack
;
530 * Finally push the "info" one at the top of the stack.
532 info
->prev
= attr_stack
;
536 static int path_matches(const char *pathname
, int pathlen
,
538 const char *base
, int baselen
)
540 if (!strchr(pattern
, '/')) {
542 const char *basename
= strrchr(pathname
, '/');
543 basename
= basename
? basename
+ 1 : pathname
;
544 return (fnmatch(pattern
, basename
, 0) == 0);
547 * match with FNM_PATHNAME; the pattern has base implicitly
552 if (pathlen
< baselen
||
553 (baselen
&& pathname
[baselen
] != '/') ||
554 strncmp(pathname
, base
, baselen
))
558 return fnmatch(pattern
, pathname
+ baselen
, FNM_PATHNAME
) == 0;
561 static int fill_one(const char *what
, struct match_attr
*a
, int rem
)
563 struct git_attr_check
*check
= check_all_attr
;
566 for (i
= 0; 0 < rem
&& i
< a
->num_attr
; i
++) {
567 struct git_attr
*attr
= a
->state
[i
].attr
;
568 const char **n
= &(check
[attr
->attr_nr
].value
);
569 const char *v
= a
->state
[i
].setto
;
571 if (*n
== ATTR__UNKNOWN
) {
572 debug_set(what
, a
->u
.pattern
, attr
, v
);
580 static int fill(const char *path
, int pathlen
, struct attr_stack
*stk
, int rem
)
583 const char *base
= stk
->origin
? stk
->origin
: "";
585 for (i
= stk
->num_matches
- 1; 0 < rem
&& 0 <= i
; i
--) {
586 struct match_attr
*a
= stk
->attrs
[i
];
589 if (path_matches(path
, pathlen
,
590 a
->u
.pattern
, base
, strlen(base
)))
591 rem
= fill_one("fill", a
, rem
);
596 static int macroexpand(struct attr_stack
*stk
, int rem
)
599 struct git_attr_check
*check
= check_all_attr
;
601 for (i
= stk
->num_matches
- 1; 0 < rem
&& 0 <= i
; i
--) {
602 struct match_attr
*a
= stk
->attrs
[i
];
605 if (check
[a
->u
.attr
->attr_nr
].value
!= ATTR__TRUE
)
607 rem
= fill_one("expand", a
, rem
);
612 int git_checkattr(const char *path
, int num
, struct git_attr_check
*check
)
614 struct attr_stack
*stk
;
616 int dirlen
, pathlen
, i
, rem
;
618 bootstrap_attr_stack();
619 for (i
= 0; i
< attr_nr
; i
++)
620 check_all_attr
[i
].value
= ATTR__UNKNOWN
;
622 pathlen
= strlen(path
);
623 cp
= strrchr(path
, '/');
628 prepare_attr_stack(path
, dirlen
);
630 for (stk
= attr_stack
; 0 < rem
&& stk
; stk
= stk
->prev
)
631 rem
= fill(path
, pathlen
, stk
, rem
);
633 for (stk
= attr_stack
; 0 < rem
&& stk
; stk
= stk
->prev
)
634 rem
= macroexpand(stk
, rem
);
636 for (i
= 0; i
< num
; i
++) {
637 const char *value
= check_all_attr
[check
[i
].attr
->attr_nr
].value
;
638 if (value
== ATTR__UNKNOWN
)
640 check
[i
].value
= value
;