Improvements to `git checkout -h`
[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
JH
9
10static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
11{
99a19b43 12 struct alternate_object_database *alt;
9938af6a 13 char hex[40];
99a19b43
JH
14 int found = 0;
15 static struct alternate_object_database *fakeent;
16
17 if (!fakeent) {
18 const char *objdir = get_object_directory();
19 int objdir_len = strlen(objdir);
20 int entlen = objdir_len + 43;
21 fakeent = xmalloc(sizeof(*fakeent) + entlen);
22 memcpy(fakeent->base, objdir, objdir_len);
23 fakeent->name = fakeent->base + objdir_len + 1;
24 fakeent->name[-1] = '/';
25 }
26 fakeent->next = alt_odb_list;
9938af6a 27
9938af6a 28 sprintf(hex, "%.2s", name);
99a19b43 29 for (alt = fakeent; alt && found < 2; alt = alt->next) {
9938af6a 30 struct dirent *de;
99a19b43
JH
31 DIR *dir;
32 sprintf(alt->name, "%.2s/", name);
33 dir = opendir(alt->base);
34 if (!dir)
35 continue;
9938af6a
JH
36 while ((de = readdir(dir)) != NULL) {
37 if (strlen(de->d_name) != 38)
38 continue;
99a19b43 39 if (memcmp(de->d_name, name + 2, len - 2))
9938af6a 40 continue;
99a19b43
JH
41 if (!found) {
42 memcpy(hex + 2, de->d_name, 38);
43 found++;
44 }
45 else if (memcmp(hex + 2, de->d_name, 38)) {
46 found = 2;
9938af6a 47 break;
99a19b43 48 }
9938af6a
JH
49 }
50 closedir(dir);
51 }
52 if (found == 1)
53 return get_sha1_hex(hex, sha1) == 0;
99a19b43 54 return found;
9938af6a
JH
55}
56
57static int match_sha(unsigned len, const unsigned char *a, const unsigned char *b)
58{
59 do {
60 if (*a != *b)
61 return 0;
62 a++;
63 b++;
64 len -= 2;
65 } while (len > 1);
66 if (len)
67 if ((*a ^ *b) & 0xf0)
68 return 0;
69 return 1;
70}
71
72static int find_short_packed_object(int len, const unsigned char *match, unsigned char *sha1)
73{
74 struct packed_git *p;
d72308e0 75 const unsigned char *found_sha1 = NULL;
99a19b43 76 int found = 0;
9938af6a
JH
77
78 prepare_packed_git();
99a19b43 79 for (p = packed_git; p && found < 2; p = p->next) {
1055880e
JB
80 uint32_t num, last;
81 uint32_t first = 0;
82 open_pack_index(p);
83 num = p->num_objects;
84 last = num;
9938af6a 85 while (first < last) {
326bf396 86 uint32_t mid = (first + last) / 2;
d72308e0 87 const unsigned char *now;
9938af6a
JH
88 int cmp;
89
d72308e0 90 now = nth_packed_object_sha1(p, mid);
a89fccd2 91 cmp = hashcmp(match, now);
9938af6a
JH
92 if (!cmp) {
93 first = mid;
94 break;
95 }
96 if (cmp > 0) {
97 first = mid+1;
98 continue;
99 }
100 last = mid;
101 }
102 if (first < num) {
d72308e0
NP
103 const unsigned char *now, *next;
104 now = nth_packed_object_sha1(p, first);
9938af6a 105 if (match_sha(len, match, now)) {
d72308e0
NP
106 next = nth_packed_object_sha1(p, first+1);
107 if (!next|| !match_sha(len, match, next)) {
0bc45890
JH
108 /* unique within this pack */
109 if (!found) {
d72308e0 110 found_sha1 = now;
0bc45890
JH
111 found++;
112 }
a89fccd2 113 else if (hashcmp(found_sha1, now)) {
0bc45890
JH
114 found = 2;
115 break;
116 }
99a19b43 117 }
0bc45890
JH
118 else {
119 /* not even unique within this pack */
99a19b43
JH
120 found = 2;
121 break;
9938af6a
JH
122 }
123 }
124 }
125 }
99a19b43 126 if (found == 1)
e702496e 127 hashcpy(sha1, found_sha1);
99a19b43
JH
128 return found;
129}
130
013f276e
JH
131#define SHORT_NAME_NOT_FOUND (-1)
132#define SHORT_NAME_AMBIGUOUS (-2)
133
99a19b43
JH
134static int find_unique_short_object(int len, char *canonical,
135 unsigned char *res, unsigned char *sha1)
136{
137 int has_unpacked, has_packed;
138 unsigned char unpacked_sha1[20], packed_sha1[20];
139
693d2bc6 140 prepare_alt_odb();
99a19b43
JH
141 has_unpacked = find_short_object_filename(len, canonical, unpacked_sha1);
142 has_packed = find_short_packed_object(len, res, packed_sha1);
143 if (!has_unpacked && !has_packed)
013f276e 144 return SHORT_NAME_NOT_FOUND;
99a19b43 145 if (1 < has_unpacked || 1 < has_packed)
013f276e 146 return SHORT_NAME_AMBIGUOUS;
99a19b43 147 if (has_unpacked != has_packed) {
e702496e 148 hashcpy(sha1, (has_packed ? packed_sha1 : unpacked_sha1));
99a19b43
JH
149 return 0;
150 }
151 /* Both have unique ones -- do they match? */
a89fccd2 152 if (hashcmp(packed_sha1, unpacked_sha1))
e974c9ab 153 return SHORT_NAME_AMBIGUOUS;
e702496e 154 hashcpy(sha1, packed_sha1);
9938af6a
JH
155 return 0;
156}
157
013f276e
JH
158static int get_short_sha1(const char *name, int len, unsigned char *sha1,
159 int quietly)
9938af6a 160{
013f276e 161 int i, status;
9938af6a
JH
162 char canonical[40];
163 unsigned char res[20];
164
8a83157e 165 if (len < MINIMUM_ABBREV || len > 40)
af61c6e0 166 return -1;
a8e0d16d 167 hashclr(res);
9938af6a 168 memset(canonical, 'x', 40);
af61c6e0 169 for (i = 0; i < len ;i++) {
9938af6a
JH
170 unsigned char c = name[i];
171 unsigned char val;
9938af6a
JH
172 if (c >= '0' && c <= '9')
173 val = c - '0';
174 else if (c >= 'a' && c <= 'f')
175 val = c - 'a' + 10;
176 else if (c >= 'A' && c <='F') {
177 val = c - 'A' + 10;
178 c -= 'A' - 'a';
179 }
180 else
181 return -1;
182 canonical[i] = c;
183 if (!(i & 1))
184 val <<= 4;
185 res[i >> 1] |= val;
186 }
99a19b43 187
013f276e
JH
188 status = find_unique_short_object(i, canonical, res, sha1);
189 if (!quietly && (status == SHORT_NAME_AMBIGUOUS))
190 return error("short SHA1 %.*s is ambiguous.", len, canonical);
191 return status;
192}
193
194const char *find_unique_abbrev(const unsigned char *sha1, int len)
195{
b66fde9a 196 int status, exists;
013f276e 197 static char hex[41];
47dd0d59 198
b66fde9a 199 exists = has_sha1_file(sha1);
013f276e 200 memcpy(hex, sha1_to_hex(sha1), 40);
02c5cba2 201 if (len == 40 || !len)
47dd0d59 202 return hex;
013f276e
JH
203 while (len < 40) {
204 unsigned char sha1_ret[20];
205 status = get_short_sha1(hex, len, sha1_ret, 1);
b66fde9a
JH
206 if (exists
207 ? !status
208 : status == SHORT_NAME_NOT_FOUND) {
013f276e
JH
209 hex[len] = 0;
210 return hex;
211 }
013f276e
JH
212 len++;
213 }
b66fde9a 214 return hex;
9938af6a
JH
215}
216
6677c466 217static int ambiguous_path(const char *path, int len)
af13cdf2
LT
218{
219 int slash = 1;
6677c466 220 int cnt;
af13cdf2 221
6677c466 222 for (cnt = 0; cnt < len; cnt++) {
af13cdf2
LT
223 switch (*path++) {
224 case '\0':
225 break;
226 case '/':
227 if (slash)
228 break;
229 slash = 1;
230 continue;
231 case '.':
232 continue;
233 default:
234 slash = 0;
235 continue;
236 }
c054d64e 237 break;
af13cdf2 238 }
6677c466 239 return slash;
af13cdf2
LT
240}
241
aa9c55b6
JS
242/*
243 * *string and *len will only be substituted, and *string returned (for
ae0ba8e2
JH
244 * later free()ing) if the string passed in is a magic short-hand form
245 * to name a branch.
aa9c55b6 246 */
431b1969 247static char *substitute_branch_name(const char **string, int *len)
aa9c55b6
JS
248{
249 struct strbuf buf = STRBUF_INIT;
431b1969 250 int ret = interpret_branch_name(*string, &buf);
aa9c55b6
JS
251
252 if (ret == *len) {
253 size_t size;
254 *string = strbuf_detach(&buf, &size);
255 *len = size;
256 return (char *)*string;
257 }
258
259 return NULL;
260}
261
e86eb666 262int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
9938af6a 263{
431b1969 264 char *last_branch = substitute_branch_name(&str, &len);
e86eb666
JH
265 const char **p, *r;
266 int refs_found = 0;
267
268 *ref = NULL;
79803322 269 for (p = ref_rev_parse_rules; *p; p++) {
94cc3552 270 char fullref[PATH_MAX];
e86eb666
JH
271 unsigned char sha1_from_ref[20];
272 unsigned char *this_result;
057e7138 273 int flag;
e86eb666
JH
274
275 this_result = refs_found ? sha1_from_ref : sha1;
94cc3552 276 mksnpath(fullref, sizeof(fullref), *p, len, str);
057e7138 277 r = resolve_ref(fullref, this_result, 1, &flag);
e86eb666
JH
278 if (r) {
279 if (!refs_found++)
280 *ref = xstrdup(r);
281 if (!warn_ambiguous_refs)
282 break;
003c6abd 283 } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD"))
057e7138 284 warning("ignoring dangling symref %s.", fullref);
e86eb666 285 }
aa9c55b6 286 free(last_branch);
e86eb666
JH
287 return refs_found;
288}
289
eb3a4822 290int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
f2eba66d 291{
431b1969 292 char *last_branch = substitute_branch_name(&str, &len);
f2eba66d
NP
293 const char **p;
294 int logs_found = 0;
295
296 *log = NULL;
79803322 297 for (p = ref_rev_parse_rules; *p; p++) {
f2eba66d 298 struct stat st;
40facde0
JH
299 unsigned char hash[20];
300 char path[PATH_MAX];
301 const char *ref, *it;
302
94cc3552 303 mksnpath(path, sizeof(path), *p, len, str);
0c4cd7f4 304 ref = resolve_ref(path, hash, 1, NULL);
40facde0
JH
305 if (!ref)
306 continue;
f2eba66d 307 if (!stat(git_path("logs/%s", path), &st) &&
40facde0
JH
308 S_ISREG(st.st_mode))
309 it = path;
310 else if (strcmp(ref, path) &&
311 !stat(git_path("logs/%s", ref), &st) &&
312 S_ISREG(st.st_mode))
313 it = ref;
314 else
315 continue;
316 if (!logs_found++) {
317 *log = xstrdup(it);
318 hashcpy(sha1, hash);
f2eba66d 319 }
40facde0
JH
320 if (!warn_ambiguous_refs)
321 break;
f2eba66d 322 }
aa9c55b6 323 free(last_branch);
f2eba66d
NP
324 return logs_found;
325}
326
ae0ba8e2
JH
327static inline int upstream_mark(const char *string, int len)
328{
329 const char *suffix[] = { "@{upstream}", "@{u}" };
330 int i;
331
332 for (i = 0; i < ARRAY_SIZE(suffix); i++) {
333 int suffix_len = strlen(suffix[i]);
334 if (suffix_len <= len
335 && !memcmp(string, suffix[i], suffix_len))
336 return suffix_len;
337 }
338 return 0;
339}
340
d18ba221
TR
341static int get_sha1_1(const char *name, int len, unsigned char *sha1);
342
e86eb666
JH
343static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
344{
eedce784 345 static const char *warn_msg = "refname '%.*s' is ambiguous.";
ed378ec7 346 char *real_ref = NULL;
ab2a1a32
JH
347 int refs_found = 0;
348 int at, reflog_len;
9938af6a 349
3c3852e3 350 if (len == 40 && !get_sha1_hex(str, sha1))
9938af6a
JH
351 return 0;
352
d18ba221 353 /* basic@{time or number or -number} format to query ref-log */
694500ed 354 reflog_len = at = 0;
f265458f 355 if (len && str[len-1] == '}') {
aa9c55b6 356 for (at = len-2; at >= 0; at--) {
ab2a1a32 357 if (str[at] == '@' && str[at+1] == '{') {
ae0ba8e2 358 if (!upstream_mark(str + at, len - at)) {
28fb8438
JS
359 reflog_len = (len-1) - (at+2);
360 len = at;
361 }
ab2a1a32
JH
362 break;
363 }
d556fae2
SP
364 }
365 }
366
af13cdf2 367 /* Accept only unambiguous ref paths. */
11cf8801 368 if (len && ambiguous_path(str, len))
af13cdf2
LT
369 return -1;
370
11cf8801 371 if (!len && reflog_len) {
d18ba221
TR
372 struct strbuf buf = STRBUF_INIT;
373 int ret;
374 /* try the @{-N} syntax for n-th checkout */
431b1969 375 ret = interpret_branch_name(str+at, &buf);
d18ba221
TR
376 if (ret > 0) {
377 /* substitute this branch name and restart */
378 return get_sha1_1(buf.buf, buf.len, sha1);
379 } else if (ret == 0) {
380 return -1;
381 }
11cf8801
NP
382 /* allow "@{...}" to mean the current branch reflog */
383 refs_found = dwim_ref("HEAD", 4, sha1, &real_ref);
f2eba66d
NP
384 } else if (reflog_len)
385 refs_found = dwim_log(str, len, sha1, &real_ref);
386 else
11cf8801 387 refs_found = dwim_ref(str, len, sha1, &real_ref);
d556fae2
SP
388
389 if (!refs_found)
390 return -1;
391
392 if (warn_ambiguous_refs && refs_found > 1)
eedce784 393 warning(warn_msg, len, str);
d556fae2 394
ab2a1a32 395 if (reflog_len) {
ab2a1a32
JH
396 int nth, i;
397 unsigned long at_time;
16d7cc90
JH
398 unsigned long co_time;
399 int co_tz, co_cnt;
400
12a258c0
JK
401 /* a @{-N} placed anywhere except the start is an error */
402 if (str[at+2] == '-')
403 return -1;
404
fe558516 405 /* Is it asking for N-th entry, or approxidate? */
ab2a1a32
JH
406 for (i = nth = 0; 0 <= nth && i < reflog_len; i++) {
407 char ch = str[at+2+i];
408 if ('0' <= ch && ch <= '9')
409 nth = nth * 10 + ch - '0';
410 else
411 nth = -1;
412 }
ea360dd0
SP
413 if (100000000 <= nth) {
414 at_time = nth;
415 nth = -1;
416 } else if (0 <= nth)
ab2a1a32 417 at_time = 0;
861f00e3 418 else {
93cfa7c7 419 int errors = 0;
861f00e3 420 char *tmp = xstrndup(str + at + 2, reflog_len);
93cfa7c7 421 at_time = approxidate_careful(tmp, &errors);
861f00e3 422 free(tmp);
a5e10acb
JH
423 if (errors)
424 return -1;
861f00e3 425 }
16d7cc90
JH
426 if (read_ref_at(real_ref, at_time, nth, sha1, NULL,
427 &co_time, &co_tz, &co_cnt)) {
428 if (at_time)
eedce784
JS
429 warning("Log for '%.*s' only goes "
430 "back to %s.", len, str,
73013afd 431 show_date(co_time, co_tz, DATE_RFC2822));
e6eedc31
JS
432 else {
433 free(real_ref);
434 die("Log for '%.*s' only has %d entries.",
435 len, str, co_cnt);
436 }
16d7cc90 437 }
d556fae2
SP
438 }
439
ed378ec7 440 free(real_ref);
d556fae2 441 return 0;
9938af6a
JH
442}
443
9938af6a
JH
444static int get_parent(const char *name, int len,
445 unsigned char *result, int idx)
446{
447 unsigned char sha1[20];
448 int ret = get_sha1_1(name, len, sha1);
449 struct commit *commit;
450 struct commit_list *p;
451
452 if (ret)
453 return ret;
454 commit = lookup_commit_reference(sha1);
455 if (!commit)
456 return -1;
457 if (parse_commit(commit))
458 return -1;
459 if (!idx) {
e702496e 460 hashcpy(result, commit->object.sha1);
9938af6a
JH
461 return 0;
462 }
463 p = commit->parents;
464 while (p) {
465 if (!--idx) {
e702496e 466 hashcpy(result, p->item->object.sha1);
9938af6a
JH
467 return 0;
468 }
469 p = p->next;
470 }
471 return -1;
472}
473
4f7599ac
JH
474static int get_nth_ancestor(const char *name, int len,
475 unsigned char *result, int generation)
476{
477 unsigned char sha1[20];
621ff675
LT
478 struct commit *commit;
479 int ret;
480
481 ret = get_sha1_1(name, len, sha1);
4f7599ac
JH
482 if (ret)
483 return ret;
621ff675
LT
484 commit = lookup_commit_reference(sha1);
485 if (!commit)
486 return -1;
4f7599ac
JH
487
488 while (generation--) {
621ff675 489 if (parse_commit(commit) || !commit->parents)
4f7599ac 490 return -1;
621ff675 491 commit = commit->parents->item;
4f7599ac 492 }
621ff675 493 hashcpy(result, commit->object.sha1);
4f7599ac
JH
494 return 0;
495}
496
81776315
JH
497struct object *peel_to_type(const char *name, int namelen,
498 struct object *o, enum object_type expected_type)
499{
500 if (name && !namelen)
501 namelen = strlen(name);
502 if (!o) {
503 unsigned char sha1[20];
504 if (get_sha1_1(name, namelen, sha1))
505 return NULL;
506 o = parse_object(sha1);
507 }
508 while (1) {
509 if (!o || (!o->parsed && !parse_object(o->sha1)))
510 return NULL;
511 if (o->type == expected_type)
512 return o;
513 if (o->type == OBJ_TAG)
514 o = ((struct tag*) o)->tagged;
515 else if (o->type == OBJ_COMMIT)
516 o = &(((struct commit *) o)->tree->object);
517 else {
518 if (name)
519 error("%.*s: expected %s type, but the object "
520 "dereferences to %s type",
521 namelen, name, typename(expected_type),
522 typename(o->type));
523 return NULL;
524 }
525 }
526}
527
5385f52d
JH
528static int peel_onion(const char *name, int len, unsigned char *sha1)
529{
530 unsigned char outer[20];
531 const char *sp;
885a86ab 532 unsigned int expected_type = 0;
5385f52d
JH
533 struct object *o;
534
535 /*
536 * "ref^{type}" dereferences ref repeatedly until you cannot
537 * dereference anymore, or you get an object of given type,
538 * whichever comes first. "ref^{}" means just dereference
539 * tags until you get a non-tag. "ref^0" is a shorthand for
540 * "ref^{commit}". "commit^{tree}" could be used to find the
541 * top-level tree of the given commit.
542 */
543 if (len < 4 || name[len-1] != '}')
544 return -1;
545
546 for (sp = name + len - 1; name <= sp; sp--) {
547 int ch = *sp;
548 if (ch == '{' && name < sp && sp[-1] == '^')
549 break;
550 }
551 if (sp <= name)
552 return -1;
553
554 sp++; /* beginning of type name, or closing brace for empty */
555 if (!strncmp(commit_type, sp, 6) && sp[6] == '}')
1974632c 556 expected_type = OBJ_COMMIT;
5385f52d 557 else if (!strncmp(tree_type, sp, 4) && sp[4] == '}')
1974632c 558 expected_type = OBJ_TREE;
5385f52d 559 else if (!strncmp(blob_type, sp, 4) && sp[4] == '}')
1974632c 560 expected_type = OBJ_BLOB;
5385f52d 561 else if (sp[0] == '}')
1974632c 562 expected_type = OBJ_NONE;
5385f52d
JH
563 else
564 return -1;
565
566 if (get_sha1_1(name, sp - name - 2, outer))
567 return -1;
568
569 o = parse_object(outer);
570 if (!o)
571 return -1;
885a86ab 572 if (!expected_type) {
9534f40b 573 o = deref_tag(o, name, sp - name - 2);
6e1c6c10
JH
574 if (!o || (!o->parsed && !parse_object(o->sha1)))
575 return -1;
e702496e 576 hashcpy(sha1, o->sha1);
5385f52d
JH
577 }
578 else {
81776315
JH
579 /*
580 * At this point, the syntax look correct, so
5385f52d
JH
581 * if we do not get the needed object, we should
582 * barf.
583 */
81776315
JH
584 o = peel_to_type(name, len, o, expected_type);
585 if (o) {
586 hashcpy(sha1, o->sha1);
587 return 0;
5385f52d 588 }
81776315 589 return -1;
5385f52d
JH
590 }
591 return 0;
592}
593
7dd45e15
JH
594static int get_describe_name(const char *name, int len, unsigned char *sha1)
595{
596 const char *cp;
597
598 for (cp = name + len - 1; name + 2 <= cp; cp--) {
599 char ch = *cp;
600 if (hexval(ch) & ~0377) {
601 /* We must be looking at g in "SOMETHING-g"
602 * for it to be describe output.
603 */
604 if (ch == 'g' && cp[-1] == '-') {
605 cp++;
606 len -= cp - name;
607 return get_short_sha1(cp, len, sha1, 1);
608 }
609 }
610 }
611 return -1;
612}
613
9938af6a
JH
614static int get_sha1_1(const char *name, int len, unsigned char *sha1)
615{
0601dbe1 616 int ret, has_suffix;
4f7599ac 617 const char *cp;
9938af6a 618
621ff675
LT
619 /*
620 * "name~3" is "name^^^", "name~" is "name~1", and "name^" is "name^1".
4f7599ac 621 */
0601dbe1 622 has_suffix = 0;
4f7599ac
JH
623 for (cp = name + len - 1; name <= cp; cp--) {
624 int ch = *cp;
625 if ('0' <= ch && ch <= '9')
626 continue;
0601dbe1
JH
627 if (ch == '~' || ch == '^')
628 has_suffix = ch;
4f7599ac
JH
629 break;
630 }
0601dbe1
JH
631
632 if (has_suffix) {
633 int num = 0;
4f7599ac
JH
634 int len1 = cp - name;
635 cp++;
636 while (cp < name + len)
0601dbe1 637 num = num * 10 + *cp++ - '0';
621ff675
LT
638 if (!num && len1 == len - 1)
639 num = 1;
640 if (has_suffix == '^')
0601dbe1 641 return get_parent(name, len1, sha1, num);
0601dbe1
JH
642 /* else if (has_suffix == '~') -- goes without saying */
643 return get_nth_ancestor(name, len1, sha1, num);
4f7599ac
JH
644 }
645
5385f52d
JH
646 ret = peel_onion(name, len, sha1);
647 if (!ret)
648 return 0;
649
9938af6a
JH
650 ret = get_sha1_basic(name, len, sha1);
651 if (!ret)
652 return 0;
7dd45e15
JH
653
654 /* It could be describe output that is "SOMETHING-gXXXX" */
655 ret = get_describe_name(name, len, sha1);
656 if (!ret)
657 return 0;
658
013f276e 659 return get_short_sha1(name, len, sha1, 0);
9938af6a
JH
660}
661
f7bff003
JH
662/*
663 * This interprets names like ':/Initial revision of "git"' by searching
664 * through history and returning the first commit whose message starts
3d045897 665 * the given regular expression.
f7bff003
JH
666 *
667 * For future extension, ':/!' is reserved. If you want to match a message
668 * beginning with a '!', you have to repeat the exclamation mark.
669 */
670#define ONELINE_SEEN (1u<<20)
671
28a4d940
JS
672static int handle_one_ref(const char *path,
673 const unsigned char *sha1, int flag, void *cb_data)
674{
675 struct commit_list **list = cb_data;
676 struct object *object = parse_object(sha1);
677 if (!object)
678 return 0;
affeef12 679 if (object->type == OBJ_TAG) {
28a4d940 680 object = deref_tag(object, path, strlen(path));
affeef12
MK
681 if (!object)
682 return 0;
683 }
28a4d940
JS
684 if (object->type != OBJ_COMMIT)
685 return 0;
686 insert_by_date((struct commit *)object, list);
f7bff003 687 object->flags |= ONELINE_SEEN;
28a4d940
JS
688 return 0;
689}
690
1358e7d6 691static int get_sha1_oneline(const char *prefix, unsigned char *sha1)
28a4d940
JS
692{
693 struct commit_list *list = NULL, *backup = NULL, *l;
1358e7d6 694 int retval = -1;
364d3e65 695 char *temp_commit_buffer = NULL;
57895105 696 regex_t regex;
28a4d940
JS
697
698 if (prefix[0] == '!') {
699 if (prefix[1] != '!')
700 die ("Invalid search pattern: %s", prefix);
701 prefix++;
702 }
57895105
LT
703
704 if (regcomp(&regex, prefix, REG_EXTENDED))
705 die("Invalid search pattern: %s", prefix);
706
28a4d940
JS
707 for_each_ref(handle_one_ref, &list);
708 for (l = list; l; l = l->next)
709 commit_list_insert(l->item, &backup);
ed8ad7e2 710 while (list) {
28a4d940 711 char *p;
1358e7d6 712 struct commit *commit;
364d3e65
JS
713 enum object_type type;
714 unsigned long size;
ed8ad7e2
JM
715
716 commit = pop_most_recent_commit(&list, ONELINE_SEEN);
283cdbcf
MK
717 if (!parse_object(commit->object.sha1))
718 continue;
8e0f7003 719 free(temp_commit_buffer);
364d3e65
JS
720 if (commit->buffer)
721 p = commit->buffer;
722 else {
723 p = read_sha1_file(commit->object.sha1, &type, &size);
724 if (!p)
725 continue;
726 temp_commit_buffer = p;
727 }
728 if (!(p = strstr(p, "\n\n")))
28a4d940 729 continue;
57895105 730 if (!regexec(&regex, p + 2, 0, NULL, 0)) {
28a4d940 731 hashcpy(sha1, commit->object.sha1);
1358e7d6 732 retval = 0;
28a4d940
JS
733 break;
734 }
735 }
57895105 736 regfree(&regex);
8e0f7003 737 free(temp_commit_buffer);
28a4d940
JS
738 free_commit_list(list);
739 for (l = backup; l; l = l->next)
740 clear_commit_marks(l->item, ONELINE_SEEN);
1358e7d6 741 return retval;
28a4d940
JS
742}
743
ae5a6c36 744struct grab_nth_branch_switch_cbdata {
c2883e62 745 long cnt, alloc;
ae5a6c36
JH
746 struct strbuf *buf;
747};
748
749static int grab_nth_branch_switch(unsigned char *osha1, unsigned char *nsha1,
750 const char *email, unsigned long timestamp, int tz,
751 const char *message, void *cb_data)
752{
753 struct grab_nth_branch_switch_cbdata *cb = cb_data;
a884d0cb
TR
754 const char *match = NULL, *target = NULL;
755 size_t len;
c2883e62 756 int nth;
a884d0cb
TR
757
758 if (!prefixcmp(message, "checkout: moving from ")) {
759 match = message + strlen("checkout: moving from ");
d7c03c1f 760 target = strstr(match, " to ");
ae5a6c36
JH
761 }
762
c829774c 763 if (!match || !target)
ae5a6c36
JH
764 return 0;
765
d7c03c1f 766 len = target - match;
c2883e62
JH
767 nth = cb->cnt++ % cb->alloc;
768 strbuf_reset(&cb->buf[nth]);
769 strbuf_add(&cb->buf[nth], match, len);
ae5a6c36
JH
770 return 0;
771}
772
773/*
ae0ba8e2
JH
774 * Parse @{-N} syntax, return the number of characters parsed
775 * if successful; otherwise signal an error with negative value.
ae5a6c36 776 */
ae0ba8e2 777static int interpret_nth_prior_checkout(const char *name, struct strbuf *buf)
ae5a6c36 778{
c2883e62 779 long nth;
39765e59 780 int i, retval;
ae5a6c36 781 struct grab_nth_branch_switch_cbdata cb;
a884d0cb
TR
782 const char *brace;
783 char *num_end;
ae5a6c36
JH
784
785 if (name[0] != '@' || name[1] != '{' || name[2] != '-')
786 return -1;
a884d0cb
TR
787 brace = strchr(name, '}');
788 if (!brace)
789 return -1;
790 nth = strtol(name+3, &num_end, 10);
791 if (num_end != brace)
ae5a6c36 792 return -1;
c2883e62
JH
793 if (nth <= 0)
794 return -1;
795 cb.alloc = nth;
796 cb.buf = xmalloc(nth * sizeof(struct strbuf));
797 for (i = 0; i < nth; i++)
798 strbuf_init(&cb.buf[i], 20);
799 cb.cnt = 0;
39765e59 800 retval = 0;
101d15e0
JH
801 for_each_recent_reflog_ent("HEAD", grab_nth_branch_switch, 40960, &cb);
802 if (cb.cnt < nth) {
803 cb.cnt = 0;
101d15e0
JH
804 for_each_reflog_ent("HEAD", grab_nth_branch_switch, &cb);
805 }
c2883e62 806 if (cb.cnt < nth)
39765e59 807 goto release_return;
c2883e62
JH
808 i = cb.cnt % nth;
809 strbuf_reset(buf);
810 strbuf_add(buf, cb.buf[i].buf, cb.buf[i].len);
39765e59
JH
811 retval = brace-name+1;
812
813release_return:
c2883e62
JH
814 for (i = 0; i < nth; i++)
815 strbuf_release(&cb.buf[i]);
816 free(cb.buf);
a884d0cb 817
39765e59 818 return retval;
ae5a6c36
JH
819}
820
619a644d
JH
821int get_sha1_mb(const char *name, unsigned char *sha1)
822{
823 struct commit *one, *two;
824 struct commit_list *mbs;
825 unsigned char sha1_tmp[20];
826 const char *dots;
827 int st;
828
829 dots = strstr(name, "...");
830 if (!dots)
831 return get_sha1(name, sha1);
832 if (dots == name)
833 st = get_sha1("HEAD", sha1_tmp);
834 else {
835 struct strbuf sb;
836 strbuf_init(&sb, dots - name);
837 strbuf_add(&sb, name, dots - name);
838 st = get_sha1(sb.buf, sha1_tmp);
839 strbuf_release(&sb);
840 }
841 if (st)
842 return st;
843 one = lookup_commit_reference_gently(sha1_tmp, 0);
844 if (!one)
845 return -1;
846
847 if (get_sha1(dots[3] ? (dots + 3) : "HEAD", sha1_tmp))
848 return -1;
849 two = lookup_commit_reference_gently(sha1_tmp, 0);
850 if (!two)
851 return -1;
852 mbs = get_merge_bases(one, two, 1);
853 if (!mbs || mbs->next)
854 st = -1;
855 else {
856 st = 0;
857 hashcpy(sha1, mbs->item->object.sha1);
858 }
859 free_commit_list(mbs);
860 return st;
861}
862
ae0ba8e2
JH
863/*
864 * This reads short-hand syntax that not only evaluates to a commit
865 * object name, but also can act as if the end user spelled the name
866 * of the branch from the command line.
867 *
868 * - "@{-N}" finds the name of the Nth previous branch we were on, and
869 * places the name of the branch in the given buf and returns the
870 * number of characters parsed if successful.
871 *
872 * - "<branch>@{upstream}" finds the name of the other ref that
873 * <branch> is configured to merge with (missing <branch> defaults
874 * to the current branch), and places the name of the branch in the
875 * given buf and returns the number of characters parsed if
876 * successful.
877 *
878 * If the input is not of the accepted format, it returns a negative
879 * number to signal an error.
880 *
881 * If the input was ok but there are not N branch switches in the
882 * reflog, it returns 0.
883 */
884int interpret_branch_name(const char *name, struct strbuf *buf)
885{
886 char *cp;
887 struct branch *upstream;
888 int namelen = strlen(name);
889 int len = interpret_nth_prior_checkout(name, buf);
890 int tmp_len;
891
892 if (!len)
893 return len; /* syntax Ok, not enough switches */
d46a8301
JK
894 if (0 < len && len == namelen)
895 return len; /* consumed all */
896 else if (0 < len) {
897 /* we have extra data, which might need further processing */
898 struct strbuf tmp = STRBUF_INIT;
899 int used = buf->len;
900 int ret;
901
902 strbuf_add(buf, name + len, namelen - len);
903 ret = interpret_branch_name(buf->buf, &tmp);
904 /* that data was not interpreted, remove our cruft */
905 if (ret < 0) {
906 strbuf_setlen(buf, used);
907 return len;
908 }
909 strbuf_reset(buf);
910 strbuf_addbuf(buf, &tmp);
911 strbuf_release(&tmp);
912 /* tweak for size of {-N} versus expanded ref name */
913 return ret - used + len;
914 }
915
ae0ba8e2
JH
916 cp = strchr(name, '@');
917 if (!cp)
918 return -1;
919 tmp_len = upstream_mark(cp, namelen - (cp - name));
920 if (!tmp_len)
921 return -1;
922 len = cp + tmp_len - name;
923 cp = xstrndup(name, cp - name);
924 upstream = branch_get(*cp ? cp : NULL);
925 if (!upstream
926 || !upstream->merge
927 || !upstream->merge[0]->dst)
928 return error("No upstream branch found for '%s'", cp);
929 free(cp);
930 cp = shorten_unambiguous_ref(upstream->merge[0]->dst, 0);
931 strbuf_reset(buf);
932 strbuf_addstr(buf, cp);
933 free(cp);
934 return len;
935}
936
9938af6a
JH
937/*
938 * This is like "get_sha1_basic()", except it allows "sha1 expressions",
939 * notably "xyz^" for "parent of xyz"
940 */
941int get_sha1(const char *name, unsigned char *sha1)
942{
573285e5
CP
943 struct object_context unused;
944 return get_sha1_with_context(name, sha1, &unused);
a0cd87a5
MK
945}
946
009fee47
MM
947/* Must be called only when object_name:filename doesn't exist. */
948static void diagnose_invalid_sha1_path(const char *prefix,
949 const char *filename,
950 const unsigned char *tree_sha1,
951 const char *object_name)
952{
953 struct stat st;
954 unsigned char sha1[20];
955 unsigned mode;
956
957 if (!prefix)
958 prefix = "";
959
960 if (!lstat(filename, &st))
961 die("Path '%s' exists on disk, but not in '%s'.",
962 filename, object_name);
963 if (errno == ENOENT || errno == ENOTDIR) {
964 char *fullname = xmalloc(strlen(filename)
965 + strlen(prefix) + 1);
966 strcpy(fullname, prefix);
967 strcat(fullname, filename);
968
969 if (!get_tree_entry(tree_sha1, fullname,
970 sha1, &mode)) {
971 die("Path '%s' exists, but not '%s'.\n"
972 "Did you mean '%s:%s'?",
973 fullname,
974 filename,
975 object_name,
976 fullname);
977 }
978 die("Path '%s' does not exist in '%s'",
979 filename, object_name);
980 }
981}
982
983/* Must be called only when :stage:filename doesn't exist. */
984static void diagnose_invalid_index_path(int stage,
985 const char *prefix,
986 const char *filename)
987{
988 struct stat st;
989 struct cache_entry *ce;
990 int pos;
991 unsigned namelen = strlen(filename);
992 unsigned fullnamelen;
993 char *fullname;
994
995 if (!prefix)
996 prefix = "";
997
998 /* Wrong stage number? */
999 pos = cache_name_pos(filename, namelen);
1000 if (pos < 0)
1001 pos = -pos - 1;
77e8466f
MH
1002 if (pos < active_nr) {
1003 ce = active_cache[pos];
1004 if (ce_namelen(ce) == namelen &&
1005 !memcmp(ce->name, filename, namelen))
1006 die("Path '%s' is in the index, but not at stage %d.\n"
1007 "Did you mean ':%d:%s'?",
1008 filename, stage,
1009 ce_stage(ce), filename);
1010 }
009fee47
MM
1011
1012 /* Confusion between relative and absolute filenames? */
1013 fullnamelen = namelen + strlen(prefix);
1014 fullname = xmalloc(fullnamelen + 1);
1015 strcpy(fullname, prefix);
1016 strcat(fullname, filename);
1017 pos = cache_name_pos(fullname, fullnamelen);
1018 if (pos < 0)
1019 pos = -pos - 1;
77e8466f
MH
1020 if (pos < active_nr) {
1021 ce = active_cache[pos];
1022 if (ce_namelen(ce) == fullnamelen &&
1023 !memcmp(ce->name, fullname, fullnamelen))
1024 die("Path '%s' is in the index, but not '%s'.\n"
1025 "Did you mean ':%d:%s'?",
1026 fullname, filename,
1027 ce_stage(ce), fullname);
1028 }
009fee47
MM
1029
1030 if (!lstat(filename, &st))
1031 die("Path '%s' exists on disk, but not in the index.", filename);
1032 if (errno == ENOENT || errno == ENOTDIR)
1033 die("Path '%s' does not exist (neither on disk nor in the index).",
1034 filename);
1035
1036 free(fullname);
1037}
1038
1039
1040int get_sha1_with_mode_1(const char *name, unsigned char *sha1, unsigned *mode, int gently, const char *prefix)
573285e5
CP
1041{
1042 struct object_context oc;
1043 int ret;
1044 ret = get_sha1_with_context_1(name, sha1, &oc, gently, prefix);
1045 *mode = oc.mode;
1046 return ret;
1047}
1048
1049int get_sha1_with_context_1(const char *name, unsigned char *sha1,
1050 struct object_context *oc,
1051 int gently, const char *prefix)
a0cd87a5
MK
1052{
1053 int ret, bracket_depth;
73b0e5af
JH
1054 int namelen = strlen(name);
1055 const char *cp;
5119602a 1056
573285e5
CP
1057 memset(oc, 0, sizeof(*oc));
1058 oc->mode = S_IFINVALID;
73b0e5af
JH
1059 ret = get_sha1_1(name, namelen, sha1);
1060 if (!ret)
1061 return ret;
1062 /* sha1:path --> object name of path in ent sha1
1063 * :path -> object name of path in index
1064 * :[0-3]:path -> object name of path in index at stage
1065 */
1066 if (name[0] == ':') {
1067 int stage = 0;
1068 struct cache_entry *ce;
1069 int pos;
28a4d940
JS
1070 if (namelen > 2 && name[1] == '/')
1071 return get_sha1_oneline(name + 2, sha1);
73b0e5af
JH
1072 if (namelen < 3 ||
1073 name[2] != ':' ||
1074 name[1] < '0' || '3' < name[1])
1075 cp = name + 1;
1076 else {
1077 stage = name[1] - '0';
1078 cp = name + 3;
5119602a 1079 }
73b0e5af 1080 namelen = namelen - (cp - name);
573285e5
CP
1081
1082 strncpy(oc->path, cp,
1083 sizeof(oc->path));
1084 oc->path[sizeof(oc->path)-1] = '\0';
1085
73b0e5af
JH
1086 if (!active_cache)
1087 read_cache();
73b0e5af
JH
1088 pos = cache_name_pos(cp, namelen);
1089 if (pos < 0)
1090 pos = -pos - 1;
1091 while (pos < active_nr) {
1092 ce = active_cache[pos];
1093 if (ce_namelen(ce) != namelen ||
1094 memcmp(ce->name, cp, namelen))
1095 break;
1096 if (ce_stage(ce) == stage) {
e702496e 1097 hashcpy(sha1, ce->sha1);
73b0e5af
JH
1098 return 0;
1099 }
e7cef45f 1100 pos++;
73b0e5af 1101 }
009fee47
MM
1102 if (!gently)
1103 diagnose_invalid_index_path(stage, prefix, cp);
73b0e5af
JH
1104 return -1;
1105 }
cce91a2c
SP
1106 for (cp = name, bracket_depth = 0; *cp; cp++) {
1107 if (*cp == '{')
1108 bracket_depth++;
1109 else if (bracket_depth && *cp == '}')
1110 bracket_depth--;
1111 else if (!bracket_depth && *cp == ':')
1112 break;
1113 }
1114 if (*cp == ':') {
73b0e5af 1115 unsigned char tree_sha1[20];
009fee47
MM
1116 char *object_name = NULL;
1117 if (!gently) {
1118 object_name = xmalloc(cp-name+1);
1119 strncpy(object_name, name, cp-name);
1120 object_name[cp-name] = '\0';
1121 }
1122 if (!get_sha1_1(name, cp-name, tree_sha1)) {
1123 const char *filename = cp+1;
573285e5 1124 ret = get_tree_entry(tree_sha1, filename, sha1, &oc->mode);
009fee47
MM
1125 if (!gently) {
1126 diagnose_invalid_sha1_path(prefix, filename,
1127 tree_sha1, object_name);
1128 free(object_name);
1129 }
573285e5
CP
1130 hashcpy(oc->tree, tree_sha1);
1131 strncpy(oc->path, filename,
1132 sizeof(oc->path));
1133 oc->path[sizeof(oc->path)-1] = '\0';
1134
009fee47
MM
1135 return ret;
1136 } else {
1137 if (!gently)
1138 die("Invalid object name '%s'.", object_name);
1139 }
5119602a
LT
1140 }
1141 return ret;
9938af6a 1142}