Change bad_ref_char() to return a boolean value
[git/git.git] / sha1_name.c
CommitLineData
9938af6a 1#include "cache.h"
5385f52d 2#include "tag.h"
9938af6a 3#include "commit.h"
5385f52d
JH
4#include "tree.h"
5#include "blob.h"
f3ab49db 6#include "tree-walk.h"
d556fae2 7#include "refs.h"
28fb8438 8#include "remote.h"
9938af6a 9
32574b68
NTND
10static int get_sha1_oneline(const char *, unsigned char *, struct commit_list *);
11
9938af6a
JH
12static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
13{
99a19b43 14 struct alternate_object_database *alt;
9938af6a 15 char hex[40];
99a19b43
JH
16 int found = 0;
17 static struct alternate_object_database *fakeent;
18
19 if (!fakeent) {
20 const char *objdir = get_object_directory();
21 int objdir_len = strlen(objdir);
22 int entlen = objdir_len + 43;
23 fakeent = xmalloc(sizeof(*fakeent) + entlen);
24 memcpy(fakeent->base, objdir, objdir_len);
25 fakeent->name = fakeent->base + objdir_len + 1;
26 fakeent->name[-1] = '/';
27 }
28 fakeent->next = alt_odb_list;
9938af6a 29
9938af6a 30 sprintf(hex, "%.2s", name);
99a19b43 31 for (alt = fakeent; alt && found < 2; alt = alt->next) {
9938af6a 32 struct dirent *de;
99a19b43
JH
33 DIR *dir;
34 sprintf(alt->name, "%.2s/", name);
35 dir = opendir(alt->base);
36 if (!dir)
37 continue;
9938af6a
JH
38 while ((de = readdir(dir)) != NULL) {
39 if (strlen(de->d_name) != 38)
40 continue;
99a19b43 41 if (memcmp(de->d_name, name + 2, len - 2))
9938af6a 42 continue;
99a19b43
JH
43 if (!found) {
44 memcpy(hex + 2, de->d_name, 38);
45 found++;
46 }
47 else if (memcmp(hex + 2, de->d_name, 38)) {
48 found = 2;
9938af6a 49 break;
99a19b43 50 }
9938af6a
JH
51 }
52 closedir(dir);
53 }
54 if (found == 1)
55 return get_sha1_hex(hex, sha1) == 0;
99a19b43 56 return found;
9938af6a
JH
57}
58
59static int match_sha(unsigned len, const unsigned char *a, const unsigned char *b)
60{
61 do {
62 if (*a != *b)
63 return 0;
64 a++;
65 b++;
66 len -= 2;
67 } while (len > 1);
68 if (len)
69 if ((*a ^ *b) & 0xf0)
70 return 0;
71 return 1;
72}
73
74static int find_short_packed_object(int len, const unsigned char *match, unsigned char *sha1)
75{
76 struct packed_git *p;
d72308e0 77 const unsigned char *found_sha1 = NULL;
99a19b43 78 int found = 0;
9938af6a
JH
79
80 prepare_packed_git();
99a19b43 81 for (p = packed_git; p && found < 2; p = p->next) {
1055880e
JB
82 uint32_t num, last;
83 uint32_t first = 0;
84 open_pack_index(p);
85 num = p->num_objects;
86 last = num;
9938af6a 87 while (first < last) {
326bf396 88 uint32_t mid = (first + last) / 2;
d72308e0 89 const unsigned char *now;
9938af6a
JH
90 int cmp;
91
d72308e0 92 now = nth_packed_object_sha1(p, mid);
a89fccd2 93 cmp = hashcmp(match, now);
9938af6a
JH
94 if (!cmp) {
95 first = mid;
96 break;
97 }
98 if (cmp > 0) {
99 first = mid+1;
100 continue;
101 }
102 last = mid;
103 }
104 if (first < num) {
d72308e0
NP
105 const unsigned char *now, *next;
106 now = nth_packed_object_sha1(p, first);
9938af6a 107 if (match_sha(len, match, now)) {
d72308e0
NP
108 next = nth_packed_object_sha1(p, first+1);
109 if (!next|| !match_sha(len, match, next)) {
0bc45890
JH
110 /* unique within this pack */
111 if (!found) {
d72308e0 112 found_sha1 = now;
0bc45890
JH
113 found++;
114 }
a89fccd2 115 else if (hashcmp(found_sha1, now)) {
0bc45890
JH
116 found = 2;
117 break;
118 }
99a19b43 119 }
0bc45890
JH
120 else {
121 /* not even unique within this pack */
99a19b43
JH
122 found = 2;
123 break;
9938af6a
JH
124 }
125 }
126 }
127 }
99a19b43 128 if (found == 1)
e702496e 129 hashcpy(sha1, found_sha1);
99a19b43
JH
130 return found;
131}
132
013f276e
JH
133#define SHORT_NAME_NOT_FOUND (-1)
134#define SHORT_NAME_AMBIGUOUS (-2)
135
99a19b43
JH
136static int find_unique_short_object(int len, char *canonical,
137 unsigned char *res, unsigned char *sha1)
138{
139 int has_unpacked, has_packed;
140 unsigned char unpacked_sha1[20], packed_sha1[20];
141
693d2bc6 142 prepare_alt_odb();
99a19b43
JH
143 has_unpacked = find_short_object_filename(len, canonical, unpacked_sha1);
144 has_packed = find_short_packed_object(len, res, packed_sha1);
145 if (!has_unpacked && !has_packed)
013f276e 146 return SHORT_NAME_NOT_FOUND;
99a19b43 147 if (1 < has_unpacked || 1 < has_packed)
013f276e 148 return SHORT_NAME_AMBIGUOUS;
99a19b43 149 if (has_unpacked != has_packed) {
e702496e 150 hashcpy(sha1, (has_packed ? packed_sha1 : unpacked_sha1));
99a19b43
JH
151 return 0;
152 }
153 /* Both have unique ones -- do they match? */
a89fccd2 154 if (hashcmp(packed_sha1, unpacked_sha1))
e974c9ab 155 return SHORT_NAME_AMBIGUOUS;
e702496e 156 hashcpy(sha1, packed_sha1);
9938af6a
JH
157 return 0;
158}
159
013f276e
JH
160static int get_short_sha1(const char *name, int len, unsigned char *sha1,
161 int quietly)
9938af6a 162{
013f276e 163 int i, status;
9938af6a
JH
164 char canonical[40];
165 unsigned char res[20];
166
8a83157e 167 if (len < MINIMUM_ABBREV || len > 40)
af61c6e0 168 return -1;
a8e0d16d 169 hashclr(res);
9938af6a 170 memset(canonical, 'x', 40);
af61c6e0 171 for (i = 0; i < len ;i++) {
9938af6a
JH
172 unsigned char c = name[i];
173 unsigned char val;
9938af6a
JH
174 if (c >= '0' && c <= '9')
175 val = c - '0';
176 else if (c >= 'a' && c <= 'f')
177 val = c - 'a' + 10;
178 else if (c >= 'A' && c <='F') {
179 val = c - 'A' + 10;
180 c -= 'A' - 'a';
181 }
182 else
183 return -1;
184 canonical[i] = c;
185 if (!(i & 1))
186 val <<= 4;
187 res[i >> 1] |= val;
188 }
99a19b43 189
013f276e
JH
190 status = find_unique_short_object(i, canonical, res, sha1);
191 if (!quietly && (status == SHORT_NAME_AMBIGUOUS))
192 return error("short SHA1 %.*s is ambiguous.", len, canonical);
193 return status;
194}
195
196const char *find_unique_abbrev(const unsigned char *sha1, int len)
197{
b66fde9a 198 int status, exists;
013f276e 199 static char hex[41];
47dd0d59 200
b66fde9a 201 exists = has_sha1_file(sha1);
013f276e 202 memcpy(hex, sha1_to_hex(sha1), 40);
02c5cba2 203 if (len == 40 || !len)
47dd0d59 204 return hex;
013f276e
JH
205 while (len < 40) {
206 unsigned char sha1_ret[20];
207 status = get_short_sha1(hex, len, sha1_ret, 1);
b66fde9a
JH
208 if (exists
209 ? !status
210 : status == SHORT_NAME_NOT_FOUND) {
ea2c69ed 211 hex[len] = 0;
013f276e
JH
212 return hex;
213 }
013f276e
JH
214 len++;
215 }
b66fde9a 216 return hex;
9938af6a
JH
217}
218
6677c466 219static int ambiguous_path(const char *path, int len)
af13cdf2
LT
220{
221 int slash = 1;
6677c466 222 int cnt;
af13cdf2 223
6677c466 224 for (cnt = 0; cnt < len; cnt++) {
af13cdf2
LT
225 switch (*path++) {
226 case '\0':
227 break;
228 case '/':
229 if (slash)
230 break;
231 slash = 1;
232 continue;
233 case '.':
234 continue;
235 default:
236 slash = 0;
237 continue;
238 }
c054d64e 239 break;
af13cdf2 240 }
6677c466 241 return slash;
af13cdf2
LT
242}
243
aa9c55b6
JS
244/*
245 * *string and *len will only be substituted, and *string returned (for
ae0ba8e2
JH
246 * later free()ing) if the string passed in is a magic short-hand form
247 * to name a branch.
aa9c55b6 248 */
431b1969 249static char *substitute_branch_name(const char **string, int *len)
aa9c55b6
JS
250{
251 struct strbuf buf = STRBUF_INIT;
431b1969 252 int ret = interpret_branch_name(*string, &buf);
aa9c55b6
JS
253
254 if (ret == *len) {
255 size_t size;
256 *string = strbuf_detach(&buf, &size);
257 *len = size;
258 return (char *)*string;
259 }
260
261 return NULL;
262}
263
e86eb666 264int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
9938af6a 265{
431b1969 266 char *last_branch = substitute_branch_name(&str, &len);
e86eb666
JH
267 const char **p, *r;
268 int refs_found = 0;
269
270 *ref = NULL;
79803322 271 for (p = ref_rev_parse_rules; *p; p++) {
94cc3552 272 char fullref[PATH_MAX];
e86eb666
JH
273 unsigned char sha1_from_ref[20];
274 unsigned char *this_result;
057e7138 275 int flag;
e86eb666
JH
276
277 this_result = refs_found ? sha1_from_ref : sha1;
94cc3552 278 mksnpath(fullref, sizeof(fullref), *p, len, str);
057e7138 279 r = resolve_ref(fullref, this_result, 1, &flag);
e86eb666
JH
280 if (r) {
281 if (!refs_found++)
282 *ref = xstrdup(r);
283 if (!warn_ambiguous_refs)
284 break;
003c6abd 285 } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD"))
057e7138 286 warning("ignoring dangling symref %s.", fullref);
e86eb666 287 }
aa9c55b6 288 free(last_branch);
e86eb666
JH
289 return refs_found;
290}
291
eb3a4822 292int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
f2eba66d 293{
431b1969 294 char *last_branch = substitute_branch_name(&str, &len);
f2eba66d
NP
295 const char **p;
296 int logs_found = 0;
297
298 *log = NULL;
79803322 299 for (p = ref_rev_parse_rules; *p; p++) {
f2eba66d 300 struct stat st;
40facde0
JH
301 unsigned char hash[20];
302 char path[PATH_MAX];
303 const char *ref, *it;
304
94cc3552 305 mksnpath(path, sizeof(path), *p, len, str);
0c4cd7f4 306 ref = resolve_ref(path, hash, 1, NULL);
40facde0
JH
307 if (!ref)
308 continue;
f2eba66d 309 if (!stat(git_path("logs/%s", path), &st) &&
40facde0
JH
310 S_ISREG(st.st_mode))
311 it = path;
312 else if (strcmp(ref, path) &&
313 !stat(git_path("logs/%s", ref), &st) &&
314 S_ISREG(st.st_mode))
315 it = ref;
316 else
317 continue;
318 if (!logs_found++) {
319 *log = xstrdup(it);
320 hashcpy(sha1, hash);
f2eba66d 321 }
40facde0
JH
322 if (!warn_ambiguous_refs)
323 break;
f2eba66d 324 }
aa9c55b6 325 free(last_branch);
f2eba66d
NP
326 return logs_found;
327}
328
ae0ba8e2
JH
329static inline int upstream_mark(const char *string, int len)
330{
331 const char *suffix[] = { "@{upstream}", "@{u}" };
332 int i;
333
334 for (i = 0; i < ARRAY_SIZE(suffix); i++) {
335 int suffix_len = strlen(suffix[i]);
336 if (suffix_len <= len
337 && !memcmp(string, suffix[i], suffix_len))
338 return suffix_len;
339 }
340 return 0;
341}
342
d18ba221
TR
343static int get_sha1_1(const char *name, int len, unsigned char *sha1);
344
e86eb666
JH
345static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
346{
eedce784 347 static const char *warn_msg = "refname '%.*s' is ambiguous.";
ed378ec7 348 char *real_ref = NULL;
ab2a1a32
JH
349 int refs_found = 0;
350 int at, reflog_len;
9938af6a 351
3c3852e3 352 if (len == 40 && !get_sha1_hex(str, sha1))
9938af6a
JH
353 return 0;
354
d18ba221 355 /* basic@{time or number or -number} format to query ref-log */
694500ed 356 reflog_len = at = 0;
f265458f 357 if (len && str[len-1] == '}') {
aa9c55b6 358 for (at = len-2; at >= 0; at--) {
ab2a1a32 359 if (str[at] == '@' && str[at+1] == '{') {
ae0ba8e2 360 if (!upstream_mark(str + at, len - at)) {
28fb8438
JS
361 reflog_len = (len-1) - (at+2);
362 len = at;
363 }
ab2a1a32
JH
364 break;
365 }
d556fae2
SP
366 }
367 }
368
af13cdf2 369 /* Accept only unambiguous ref paths. */
11cf8801 370 if (len && ambiguous_path(str, len))
af13cdf2
LT
371 return -1;
372
11cf8801 373 if (!len && reflog_len) {
d18ba221
TR
374 struct strbuf buf = STRBUF_INIT;
375 int ret;
376 /* try the @{-N} syntax for n-th checkout */
431b1969 377 ret = interpret_branch_name(str+at, &buf);
d18ba221
TR
378 if (ret > 0) {
379 /* substitute this branch name and restart */
380 return get_sha1_1(buf.buf, buf.len, sha1);
381 } else if (ret == 0) {
382 return -1;
383 }
11cf8801
NP
384 /* allow "@{...}" to mean the current branch reflog */
385 refs_found = dwim_ref("HEAD", 4, sha1, &real_ref);
f2eba66d
NP
386 } else if (reflog_len)
387 refs_found = dwim_log(str, len, sha1, &real_ref);
388 else
11cf8801 389 refs_found = dwim_ref(str, len, sha1, &real_ref);
d556fae2
SP
390
391 if (!refs_found)
392 return -1;
393
394 if (warn_ambiguous_refs && refs_found > 1)
eedce784 395 warning(warn_msg, len, str);
d556fae2 396
ab2a1a32 397 if (reflog_len) {
ab2a1a32
JH
398 int nth, i;
399 unsigned long at_time;
16d7cc90
JH
400 unsigned long co_time;
401 int co_tz, co_cnt;
402
12a258c0
JK
403 /* a @{-N} placed anywhere except the start is an error */
404 if (str[at+2] == '-')
405 return -1;
406
fe558516 407 /* Is it asking for N-th entry, or approxidate? */
ab2a1a32
JH
408 for (i = nth = 0; 0 <= nth && i < reflog_len; i++) {
409 char ch = str[at+2+i];
410 if ('0' <= ch && ch <= '9')
411 nth = nth * 10 + ch - '0';
412 else
413 nth = -1;
414 }
ea360dd0
SP
415 if (100000000 <= nth) {
416 at_time = nth;
417 nth = -1;
418 } else if (0 <= nth)
ab2a1a32 419 at_time = 0;
861f00e3 420 else {
93cfa7c7 421 int errors = 0;
861f00e3 422 char *tmp = xstrndup(str + at + 2, reflog_len);
93cfa7c7 423 at_time = approxidate_careful(tmp, &errors);
861f00e3 424 free(tmp);
a5e10acb
JH
425 if (errors)
426 return -1;
861f00e3 427 }
16d7cc90
JH
428 if (read_ref_at(real_ref, at_time, nth, sha1, NULL,
429 &co_time, &co_tz, &co_cnt)) {
430 if (at_time)
eedce784
JS
431 warning("Log for '%.*s' only goes "
432 "back to %s.", len, str,
73013afd 433 show_date(co_time, co_tz, DATE_RFC2822));
e6eedc31
JS
434 else {
435 free(real_ref);
436 die("Log for '%.*s' only has %d entries.",
437 len, str, co_cnt);
438 }
16d7cc90 439 }
d556fae2
SP
440 }
441
ed378ec7 442 free(real_ref);
d556fae2 443 return 0;
9938af6a
JH
444}
445
9938af6a
JH
446static int get_parent(const char *name, int len,
447 unsigned char *result, int idx)
448{
449 unsigned char sha1[20];
450 int ret = get_sha1_1(name, len, sha1);
451 struct commit *commit;
452 struct commit_list *p;
453
454 if (ret)
455 return ret;
456 commit = lookup_commit_reference(sha1);
457 if (!commit)
458 return -1;
459 if (parse_commit(commit))
460 return -1;
461 if (!idx) {
e702496e 462 hashcpy(result, commit->object.sha1);
9938af6a
JH
463 return 0;
464 }
465 p = commit->parents;
466 while (p) {
467 if (!--idx) {
e702496e 468 hashcpy(result, p->item->object.sha1);
9938af6a
JH
469 return 0;
470 }
471 p = p->next;
472 }
473 return -1;
474}
475
4f7599ac
JH
476static int get_nth_ancestor(const char *name, int len,
477 unsigned char *result, int generation)
478{
479 unsigned char sha1[20];
621ff675
LT
480 struct commit *commit;
481 int ret;
482
483 ret = get_sha1_1(name, len, sha1);
4f7599ac
JH
484 if (ret)
485 return ret;
621ff675
LT
486 commit = lookup_commit_reference(sha1);
487 if (!commit)
488 return -1;
4f7599ac
JH
489
490 while (generation--) {
621ff675 491 if (parse_commit(commit) || !commit->parents)
4f7599ac 492 return -1;
621ff675 493 commit = commit->parents->item;
4f7599ac 494 }
621ff675 495 hashcpy(result, commit->object.sha1);
4f7599ac
JH
496 return 0;
497}
498
81776315
JH
499struct object *peel_to_type(const char *name, int namelen,
500 struct object *o, enum object_type expected_type)
501{
502 if (name && !namelen)
503 namelen = strlen(name);
504 if (!o) {
505 unsigned char sha1[20];
506 if (get_sha1_1(name, namelen, sha1))
507 return NULL;
508 o = parse_object(sha1);
509 }
510 while (1) {
511 if (!o || (!o->parsed && !parse_object(o->sha1)))
512 return NULL;
513 if (o->type == expected_type)
514 return o;
515 if (o->type == OBJ_TAG)
516 o = ((struct tag*) o)->tagged;
517 else if (o->type == OBJ_COMMIT)
518 o = &(((struct commit *) o)->tree->object);
519 else {
520 if (name)
521 error("%.*s: expected %s type, but the object "
522 "dereferences to %s type",
523 namelen, name, typename(expected_type),
524 typename(o->type));
525 return NULL;
526 }
527 }
528}
529
5385f52d
JH
530static int peel_onion(const char *name, int len, unsigned char *sha1)
531{
532 unsigned char outer[20];
533 const char *sp;
885a86ab 534 unsigned int expected_type = 0;
5385f52d
JH
535 struct object *o;
536
537 /*
538 * "ref^{type}" dereferences ref repeatedly until you cannot
539 * dereference anymore, or you get an object of given type,
540 * whichever comes first. "ref^{}" means just dereference
541 * tags until you get a non-tag. "ref^0" is a shorthand for
542 * "ref^{commit}". "commit^{tree}" could be used to find the
543 * top-level tree of the given commit.
544 */
545 if (len < 4 || name[len-1] != '}')
546 return -1;
547
548 for (sp = name + len - 1; name <= sp; sp--) {
549 int ch = *sp;
550 if (ch == '{' && name < sp && sp[-1] == '^')
551 break;
552 }
553 if (sp <= name)
554 return -1;
555
556 sp++; /* beginning of type name, or closing brace for empty */
557 if (!strncmp(commit_type, sp, 6) && sp[6] == '}')
1974632c 558 expected_type = OBJ_COMMIT;
5385f52d 559 else if (!strncmp(tree_type, sp, 4) && sp[4] == '}')
1974632c 560 expected_type = OBJ_TREE;
5385f52d 561 else if (!strncmp(blob_type, sp, 4) && sp[4] == '}')
1974632c 562 expected_type = OBJ_BLOB;
5385f52d 563 else if (sp[0] == '}')
1974632c 564 expected_type = OBJ_NONE;
32574b68
NTND
565 else if (sp[0] == '/')
566 expected_type = OBJ_COMMIT;
5385f52d
JH
567 else
568 return -1;
569
570 if (get_sha1_1(name, sp - name - 2, outer))
571 return -1;
572
573 o = parse_object(outer);
574 if (!o)
575 return -1;
885a86ab 576 if (!expected_type) {
9534f40b 577 o = deref_tag(o, name, sp - name - 2);
6e1c6c10
JH
578 if (!o || (!o->parsed && !parse_object(o->sha1)))
579 return -1;
e702496e 580 hashcpy(sha1, o->sha1);
32574b68 581 return 0;
5385f52d 582 }
32574b68
NTND
583
584 /*
585 * At this point, the syntax look correct, so
586 * if we do not get the needed object, we should
587 * barf.
588 */
589 o = peel_to_type(name, len, o, expected_type);
590 if (!o)
81776315 591 return -1;
32574b68
NTND
592
593 hashcpy(sha1, o->sha1);
594 if (sp[0] == '/') {
595 /* "$commit^{/foo}" */
596 char *prefix;
597 int ret;
598 struct commit_list *list = NULL;
599
81776315 600 /*
4322842a
NTND
601 * $commit^{/}. Some regex implementation may reject.
602 * We don't need regex anyway. '' pattern always matches.
5385f52d 603 */
4322842a 604 if (sp[1] == '}')
81776315 605 return 0;
4322842a 606
32574b68
NTND
607 prefix = xstrndup(sp + 1, name + len - 1 - (sp + 1));
608 commit_list_insert((struct commit *)o, &list);
609 ret = get_sha1_oneline(prefix, sha1, list);
610 free(prefix);
611 return ret;
5385f52d
JH
612 }
613 return 0;
614}
615
7dd45e15
JH
616static int get_describe_name(const char *name, int len, unsigned char *sha1)
617{
618 const char *cp;
619
620 for (cp = name + len - 1; name + 2 <= cp; cp--) {
621 char ch = *cp;
622 if (hexval(ch) & ~0377) {
623 /* We must be looking at g in "SOMETHING-g"
624 * for it to be describe output.
625 */
626 if (ch == 'g' && cp[-1] == '-') {
627 cp++;
628 len -= cp - name;
629 return get_short_sha1(cp, len, sha1, 1);
630 }
631 }
632 }
633 return -1;
634}
635
9938af6a
JH
636static int get_sha1_1(const char *name, int len, unsigned char *sha1)
637{
0601dbe1 638 int ret, has_suffix;
4f7599ac 639 const char *cp;
9938af6a 640
621ff675
LT
641 /*
642 * "name~3" is "name^^^", "name~" is "name~1", and "name^" is "name^1".
4f7599ac 643 */
0601dbe1 644 has_suffix = 0;
4f7599ac
JH
645 for (cp = name + len - 1; name <= cp; cp--) {
646 int ch = *cp;
647 if ('0' <= ch && ch <= '9')
648 continue;
0601dbe1
JH
649 if (ch == '~' || ch == '^')
650 has_suffix = ch;
4f7599ac
JH
651 break;
652 }
0601dbe1
JH
653
654 if (has_suffix) {
655 int num = 0;
4f7599ac
JH
656 int len1 = cp - name;
657 cp++;
658 while (cp < name + len)
0601dbe1 659 num = num * 10 + *cp++ - '0';
621ff675
LT
660 if (!num && len1 == len - 1)
661 num = 1;
662 if (has_suffix == '^')
0601dbe1 663 return get_parent(name, len1, sha1, num);
0601dbe1
JH
664 /* else if (has_suffix == '~') -- goes without saying */
665 return get_nth_ancestor(name, len1, sha1, num);
4f7599ac
JH
666 }
667
5385f52d
JH
668 ret = peel_onion(name, len, sha1);
669 if (!ret)
670 return 0;
671
9938af6a
JH
672 ret = get_sha1_basic(name, len, sha1);
673 if (!ret)
674 return 0;
7dd45e15
JH
675
676 /* It could be describe output that is "SOMETHING-gXXXX" */
677 ret = get_describe_name(name, len, sha1);
678 if (!ret)
679 return 0;
680
013f276e 681 return get_short_sha1(name, len, sha1, 0);
9938af6a
JH
682}
683
f7bff003
JH
684/*
685 * This interprets names like ':/Initial revision of "git"' by searching
686 * through history and returning the first commit whose message starts
3d045897 687 * the given regular expression.
f7bff003
JH
688 *
689 * For future extension, ':/!' is reserved. If you want to match a message
690 * beginning with a '!', you have to repeat the exclamation mark.
691 */
692#define ONELINE_SEEN (1u<<20)
693
28a4d940
JS
694static int handle_one_ref(const char *path,
695 const unsigned char *sha1, int flag, void *cb_data)
696{
697 struct commit_list **list = cb_data;
698 struct object *object = parse_object(sha1);
699 if (!object)
700 return 0;
affeef12 701 if (object->type == OBJ_TAG) {
28a4d940 702 object = deref_tag(object, path, strlen(path));
affeef12
MK
703 if (!object)
704 return 0;
705 }
28a4d940
JS
706 if (object->type != OBJ_COMMIT)
707 return 0;
47e44ed1 708 commit_list_insert_by_date((struct commit *)object, list);
28a4d940
JS
709 return 0;
710}
711
84baa31b
NTND
712static int get_sha1_oneline(const char *prefix, unsigned char *sha1,
713 struct commit_list *list)
28a4d940 714{
84baa31b 715 struct commit_list *backup = NULL, *l;
28042dbc 716 int found = 0;
57895105 717 regex_t regex;
28a4d940
JS
718
719 if (prefix[0] == '!') {
720 if (prefix[1] != '!')
721 die ("Invalid search pattern: %s", prefix);
722 prefix++;
723 }
57895105
LT
724
725 if (regcomp(&regex, prefix, REG_EXTENDED))
726 die("Invalid search pattern: %s", prefix);
727
84baa31b
NTND
728 for (l = list; l; l = l->next) {
729 l->item->object.flags |= ONELINE_SEEN;
28a4d940 730 commit_list_insert(l->item, &backup);
84baa31b 731 }
ed8ad7e2 732 while (list) {
28042dbc 733 char *p, *to_free = NULL;
1358e7d6 734 struct commit *commit;
364d3e65
JS
735 enum object_type type;
736 unsigned long size;
28042dbc 737 int matches;
ed8ad7e2
JM
738
739 commit = pop_most_recent_commit(&list, ONELINE_SEEN);
283cdbcf
MK
740 if (!parse_object(commit->object.sha1))
741 continue;
364d3e65
JS
742 if (commit->buffer)
743 p = commit->buffer;
744 else {
745 p = read_sha1_file(commit->object.sha1, &type, &size);
746 if (!p)
747 continue;
28042dbc 748 to_free = p;
364d3e65 749 }
28042dbc
JH
750
751 p = strstr(p, "\n\n");
752 matches = p && !regexec(&regex, p + 2, 0, NULL, 0);
753 free(to_free);
754
755 if (matches) {
28a4d940 756 hashcpy(sha1, commit->object.sha1);
28042dbc 757 found = 1;
28a4d940
JS
758 break;
759 }
760 }
57895105 761 regfree(&regex);
28a4d940
JS
762 free_commit_list(list);
763 for (l = backup; l; l = l->next)
764 clear_commit_marks(l->item, ONELINE_SEEN);
28042dbc
JH
765 free_commit_list(backup);
766 return found ? 0 : -1;
28a4d940
JS
767}
768
ae5a6c36 769struct grab_nth_branch_switch_cbdata {
c2883e62 770 long cnt, alloc;
ae5a6c36
JH
771 struct strbuf *buf;
772};
773
774static int grab_nth_branch_switch(unsigned char *osha1, unsigned char *nsha1,
775 const char *email, unsigned long timestamp, int tz,
776 const char *message, void *cb_data)
777{
778 struct grab_nth_branch_switch_cbdata *cb = cb_data;
a884d0cb
TR
779 const char *match = NULL, *target = NULL;
780 size_t len;
c2883e62 781 int nth;
a884d0cb
TR
782
783 if (!prefixcmp(message, "checkout: moving from ")) {
784 match = message + strlen("checkout: moving from ");
d7c03c1f 785 target = strstr(match, " to ");
ae5a6c36
JH
786 }
787
c829774c 788 if (!match || !target)
ae5a6c36
JH
789 return 0;
790
d7c03c1f 791 len = target - match;
c2883e62
JH
792 nth = cb->cnt++ % cb->alloc;
793 strbuf_reset(&cb->buf[nth]);
794 strbuf_add(&cb->buf[nth], match, len);
ae5a6c36
JH
795 return 0;
796}
797
798/*
ae0ba8e2
JH
799 * Parse @{-N} syntax, return the number of characters parsed
800 * if successful; otherwise signal an error with negative value.
ae5a6c36 801 */
ae0ba8e2 802static int interpret_nth_prior_checkout(const char *name, struct strbuf *buf)
ae5a6c36 803{
c2883e62 804 long nth;
39765e59 805 int i, retval;
ae5a6c36 806 struct grab_nth_branch_switch_cbdata cb;
a884d0cb
TR
807 const char *brace;
808 char *num_end;
ae5a6c36
JH
809
810 if (name[0] != '@' || name[1] != '{' || name[2] != '-')
811 return -1;
a884d0cb
TR
812 brace = strchr(name, '}');
813 if (!brace)
814 return -1;
815 nth = strtol(name+3, &num_end, 10);
816 if (num_end != brace)
ae5a6c36 817 return -1;
c2883e62
JH
818 if (nth <= 0)
819 return -1;
820 cb.alloc = nth;
821 cb.buf = xmalloc(nth * sizeof(struct strbuf));
822 for (i = 0; i < nth; i++)
823 strbuf_init(&cb.buf[i], 20);
824 cb.cnt = 0;
39765e59 825 retval = 0;
101d15e0
JH
826 for_each_recent_reflog_ent("HEAD", grab_nth_branch_switch, 40960, &cb);
827 if (cb.cnt < nth) {
828 cb.cnt = 0;
101d15e0
JH
829 for_each_reflog_ent("HEAD", grab_nth_branch_switch, &cb);
830 }
c2883e62 831 if (cb.cnt < nth)
39765e59 832 goto release_return;
c2883e62
JH
833 i = cb.cnt % nth;
834 strbuf_reset(buf);
835 strbuf_add(buf, cb.buf[i].buf, cb.buf[i].len);
39765e59
JH
836 retval = brace-name+1;
837
838release_return:
c2883e62
JH
839 for (i = 0; i < nth; i++)
840 strbuf_release(&cb.buf[i]);
841 free(cb.buf);
a884d0cb 842
39765e59 843 return retval;
ae5a6c36
JH
844}
845
619a644d
JH
846int get_sha1_mb(const char *name, unsigned char *sha1)
847{
848 struct commit *one, *two;
849 struct commit_list *mbs;
850 unsigned char sha1_tmp[20];
851 const char *dots;
852 int st;
853
854 dots = strstr(name, "...");
855 if (!dots)
856 return get_sha1(name, sha1);
857 if (dots == name)
858 st = get_sha1("HEAD", sha1_tmp);
859 else {
860 struct strbuf sb;
861 strbuf_init(&sb, dots - name);
862 strbuf_add(&sb, name, dots - name);
863 st = get_sha1(sb.buf, sha1_tmp);
864 strbuf_release(&sb);
865 }
866 if (st)
867 return st;
868 one = lookup_commit_reference_gently(sha1_tmp, 0);
869 if (!one)
870 return -1;
871
872 if (get_sha1(dots[3] ? (dots + 3) : "HEAD", sha1_tmp))
873 return -1;
874 two = lookup_commit_reference_gently(sha1_tmp, 0);
875 if (!two)
876 return -1;
877 mbs = get_merge_bases(one, two, 1);
878 if (!mbs || mbs->next)
879 st = -1;
880 else {
881 st = 0;
882 hashcpy(sha1, mbs->item->object.sha1);
883 }
884 free_commit_list(mbs);
885 return st;
886}
887
ae0ba8e2
JH
888/*
889 * This reads short-hand syntax that not only evaluates to a commit
890 * object name, but also can act as if the end user spelled the name
891 * of the branch from the command line.
892 *
893 * - "@{-N}" finds the name of the Nth previous branch we were on, and
894 * places the name of the branch in the given buf and returns the
895 * number of characters parsed if successful.
896 *
897 * - "<branch>@{upstream}" finds the name of the other ref that
898 * <branch> is configured to merge with (missing <branch> defaults
899 * to the current branch), and places the name of the branch in the
900 * given buf and returns the number of characters parsed if
901 * successful.
902 *
903 * If the input is not of the accepted format, it returns a negative
904 * number to signal an error.
905 *
906 * If the input was ok but there are not N branch switches in the
907 * reflog, it returns 0.
908 */
909int interpret_branch_name(const char *name, struct strbuf *buf)
910{
911 char *cp;
912 struct branch *upstream;
913 int namelen = strlen(name);
914 int len = interpret_nth_prior_checkout(name, buf);
915 int tmp_len;
916
917 if (!len)
918 return len; /* syntax Ok, not enough switches */
d46a8301
JK
919 if (0 < len && len == namelen)
920 return len; /* consumed all */
921 else if (0 < len) {
922 /* we have extra data, which might need further processing */
923 struct strbuf tmp = STRBUF_INIT;
924 int used = buf->len;
925 int ret;
926
927 strbuf_add(buf, name + len, namelen - len);
928 ret = interpret_branch_name(buf->buf, &tmp);
929 /* that data was not interpreted, remove our cruft */
930 if (ret < 0) {
931 strbuf_setlen(buf, used);
932 return len;
933 }
934 strbuf_reset(buf);
935 strbuf_addbuf(buf, &tmp);
936 strbuf_release(&tmp);
937 /* tweak for size of {-N} versus expanded ref name */
938 return ret - used + len;
939 }
940
ae0ba8e2
JH
941 cp = strchr(name, '@');
942 if (!cp)
943 return -1;
944 tmp_len = upstream_mark(cp, namelen - (cp - name));
945 if (!tmp_len)
946 return -1;
947 len = cp + tmp_len - name;
948 cp = xstrndup(name, cp - name);
949 upstream = branch_get(*cp ? cp : NULL);
950 if (!upstream
951 || !upstream->merge
952 || !upstream->merge[0]->dst)
953 return error("No upstream branch found for '%s'", cp);
954 free(cp);
955 cp = shorten_unambiguous_ref(upstream->merge[0]->dst, 0);
956 strbuf_reset(buf);
957 strbuf_addstr(buf, cp);
958 free(cp);
959 return len;
960}
961
6bab74e7
JN
962int strbuf_branchname(struct strbuf *sb, const char *name)
963{
964 int len = strlen(name);
965 if (interpret_branch_name(name, sb) == len)
966 return 0;
967 strbuf_add(sb, name, len);
968 return len;
969}
970
971int strbuf_check_branch_ref(struct strbuf *sb, const char *name)
972{
973 strbuf_branchname(sb, name);
974 if (name[0] == '-')
975 return CHECK_REF_FORMAT_ERROR;
976 strbuf_splice(sb, 0, 0, "refs/heads/", 11);
977 return check_ref_format(sb->buf);
978}
979
9938af6a
JH
980/*
981 * This is like "get_sha1_basic()", except it allows "sha1 expressions",
982 * notably "xyz^" for "parent of xyz"
983 */
984int get_sha1(const char *name, unsigned char *sha1)
985{
573285e5
CP
986 struct object_context unused;
987 return get_sha1_with_context(name, sha1, &unused);
a0cd87a5
MK
988}
989
009fee47
MM
990/* Must be called only when object_name:filename doesn't exist. */
991static void diagnose_invalid_sha1_path(const char *prefix,
992 const char *filename,
993 const unsigned char *tree_sha1,
994 const char *object_name)
995{
996 struct stat st;
997 unsigned char sha1[20];
998 unsigned mode;
999
1000 if (!prefix)
1001 prefix = "";
1002
1003 if (!lstat(filename, &st))
1004 die("Path '%s' exists on disk, but not in '%s'.",
1005 filename, object_name);
1006 if (errno == ENOENT || errno == ENOTDIR) {
1007 char *fullname = xmalloc(strlen(filename)
1008 + strlen(prefix) + 1);
1009 strcpy(fullname, prefix);
1010 strcat(fullname, filename);
1011
1012 if (!get_tree_entry(tree_sha1, fullname,
1013 sha1, &mode)) {
1014 die("Path '%s' exists, but not '%s'.\n"
e41d718c 1015 "Did you mean '%s:%s' aka '%s:./%s'?",
009fee47
MM
1016 fullname,
1017 filename,
1018 object_name,
e41d718c
MG
1019 fullname,
1020 object_name,
1021 filename);
009fee47
MM
1022 }
1023 die("Path '%s' does not exist in '%s'",
1024 filename, object_name);
1025 }
1026}
1027
1028/* Must be called only when :stage:filename doesn't exist. */
1029static void diagnose_invalid_index_path(int stage,
1030 const char *prefix,
1031 const char *filename)
1032{
1033 struct stat st;
1034 struct cache_entry *ce;
1035 int pos;
1036 unsigned namelen = strlen(filename);
1037 unsigned fullnamelen;
1038 char *fullname;
1039
1040 if (!prefix)
1041 prefix = "";
1042
1043 /* Wrong stage number? */
1044 pos = cache_name_pos(filename, namelen);
1045 if (pos < 0)
1046 pos = -pos - 1;
77e8466f
MH
1047 if (pos < active_nr) {
1048 ce = active_cache[pos];
1049 if (ce_namelen(ce) == namelen &&
1050 !memcmp(ce->name, filename, namelen))
1051 die("Path '%s' is in the index, but not at stage %d.\n"
1052 "Did you mean ':%d:%s'?",
1053 filename, stage,
1054 ce_stage(ce), filename);
1055 }
009fee47
MM
1056
1057 /* Confusion between relative and absolute filenames? */
1058 fullnamelen = namelen + strlen(prefix);
1059 fullname = xmalloc(fullnamelen + 1);
1060 strcpy(fullname, prefix);
1061 strcat(fullname, filename);
1062 pos = cache_name_pos(fullname, fullnamelen);
1063 if (pos < 0)
1064 pos = -pos - 1;
77e8466f
MH
1065 if (pos < active_nr) {
1066 ce = active_cache[pos];
1067 if (ce_namelen(ce) == fullnamelen &&
1068 !memcmp(ce->name, fullname, fullnamelen))
1069 die("Path '%s' is in the index, but not '%s'.\n"
e41d718c 1070 "Did you mean ':%d:%s' aka ':%d:./%s'?",
77e8466f 1071 fullname, filename,
e41d718c
MG
1072 ce_stage(ce), fullname,
1073 ce_stage(ce), filename);
77e8466f 1074 }
009fee47
MM
1075
1076 if (!lstat(filename, &st))
1077 die("Path '%s' exists on disk, but not in the index.", filename);
1078 if (errno == ENOENT || errno == ENOTDIR)
1079 die("Path '%s' does not exist (neither on disk nor in the index).",
1080 filename);
1081
1082 free(fullname);
1083}
1084
1085
2e83b66c
JH
1086int get_sha1_with_mode_1(const char *name, unsigned char *sha1, unsigned *mode,
1087 int only_to_die, const char *prefix)
573285e5
CP
1088{
1089 struct object_context oc;
1090 int ret;
2e83b66c 1091 ret = get_sha1_with_context_1(name, sha1, &oc, only_to_die, prefix);
573285e5
CP
1092 *mode = oc.mode;
1093 return ret;
1094}
1095
979f7929
NTND
1096static char *resolve_relative_path(const char *rel)
1097{
1098 if (prefixcmp(rel, "./") && prefixcmp(rel, "../"))
1099 return NULL;
1100
1101 if (!startup_info)
1102 die("BUG: startup_info struct is not initialized.");
1103
1104 if (!is_inside_work_tree())
1105 die("relative path syntax can't be used outside working tree.");
1106
1107 /* die() inside prefix_path() if resolved path is outside worktree */
1108 return prefix_path(startup_info->prefix,
1109 startup_info->prefix ? strlen(startup_info->prefix) : 0,
1110 rel);
1111}
1112
573285e5
CP
1113int get_sha1_with_context_1(const char *name, unsigned char *sha1,
1114 struct object_context *oc,
2e83b66c 1115 int only_to_die, const char *prefix)
a0cd87a5
MK
1116{
1117 int ret, bracket_depth;
73b0e5af
JH
1118 int namelen = strlen(name);
1119 const char *cp;
5119602a 1120
573285e5
CP
1121 memset(oc, 0, sizeof(*oc));
1122 oc->mode = S_IFINVALID;
73b0e5af
JH
1123 ret = get_sha1_1(name, namelen, sha1);
1124 if (!ret)
1125 return ret;
1126 /* sha1:path --> object name of path in ent sha1
979f7929
NTND
1127 * :path -> object name of absolute path in index
1128 * :./path -> object name of path relative to cwd in index
73b0e5af 1129 * :[0-3]:path -> object name of path in index at stage
95ad6d2d 1130 * :/foo -> recent commit matching foo
73b0e5af
JH
1131 */
1132 if (name[0] == ':') {
1133 int stage = 0;
1134 struct cache_entry *ce;
979f7929 1135 char *new_path = NULL;
73b0e5af 1136 int pos;
2e83b66c 1137 if (!only_to_die && namelen > 2 && name[1] == '/') {
84baa31b
NTND
1138 struct commit_list *list = NULL;
1139 for_each_ref(handle_one_ref, &list);
1140 return get_sha1_oneline(name + 2, sha1, list);
1141 }
73b0e5af
JH
1142 if (namelen < 3 ||
1143 name[2] != ':' ||
1144 name[1] < '0' || '3' < name[1])
1145 cp = name + 1;
1146 else {
1147 stage = name[1] - '0';
1148 cp = name + 3;
5119602a 1149 }
3d6e0f74
JH
1150 new_path = resolve_relative_path(cp);
1151 if (!new_path) {
1152 namelen = namelen - (cp - name);
1153 } else {
1154 cp = new_path;
1155 namelen = strlen(cp);
1156 }
573285e5
CP
1157
1158 strncpy(oc->path, cp,
1159 sizeof(oc->path));
1160 oc->path[sizeof(oc->path)-1] = '\0';
1161
73b0e5af
JH
1162 if (!active_cache)
1163 read_cache();
73b0e5af
JH
1164 pos = cache_name_pos(cp, namelen);
1165 if (pos < 0)
1166 pos = -pos - 1;
1167 while (pos < active_nr) {
1168 ce = active_cache[pos];
1169 if (ce_namelen(ce) != namelen ||
1170 memcmp(ce->name, cp, namelen))
1171 break;
1172 if (ce_stage(ce) == stage) {
e702496e 1173 hashcpy(sha1, ce->sha1);
90064710 1174 oc->mode = ce->ce_mode;
979f7929 1175 free(new_path);
73b0e5af
JH
1176 return 0;
1177 }
e7cef45f 1178 pos++;
73b0e5af 1179 }
2e83b66c 1180 if (only_to_die && name[1] && name[1] != '/')
009fee47 1181 diagnose_invalid_index_path(stage, prefix, cp);
979f7929 1182 free(new_path);
73b0e5af
JH
1183 return -1;
1184 }
cce91a2c
SP
1185 for (cp = name, bracket_depth = 0; *cp; cp++) {
1186 if (*cp == '{')
1187 bracket_depth++;
1188 else if (bracket_depth && *cp == '}')
1189 bracket_depth--;
1190 else if (!bracket_depth && *cp == ':')
1191 break;
1192 }
1193 if (*cp == ':') {
73b0e5af 1194 unsigned char tree_sha1[20];
009fee47 1195 char *object_name = NULL;
2e83b66c 1196 if (only_to_die) {
009fee47
MM
1197 object_name = xmalloc(cp-name+1);
1198 strncpy(object_name, name, cp-name);
1199 object_name[cp-name] = '\0';
1200 }
1201 if (!get_sha1_1(name, cp-name, tree_sha1)) {
1202 const char *filename = cp+1;
979f7929
NTND
1203 char *new_filename = NULL;
1204
1205 new_filename = resolve_relative_path(filename);
1206 if (new_filename)
1207 filename = new_filename;
573285e5 1208 ret = get_tree_entry(tree_sha1, filename, sha1, &oc->mode);
2e83b66c 1209 if (only_to_die) {
009fee47
MM
1210 diagnose_invalid_sha1_path(prefix, filename,
1211 tree_sha1, object_name);
1212 free(object_name);
1213 }
573285e5
CP
1214 hashcpy(oc->tree, tree_sha1);
1215 strncpy(oc->path, filename,
1216 sizeof(oc->path));
1217 oc->path[sizeof(oc->path)-1] = '\0';
1218
979f7929 1219 free(new_filename);
009fee47
MM
1220 return ret;
1221 } else {
2e83b66c 1222 if (only_to_die)
009fee47
MM
1223 die("Invalid object name '%s'.", object_name);
1224 }
5119602a
LT
1225 }
1226 return ret;
9938af6a 1227}