sha1-name.c: add repo_interpret_branch_name()
[git/git.git] / sha1-name.c
CommitLineData
9938af6a 1#include "cache.h"
b2141fc1 2#include "config.h"
5385f52d 3#include "tag.h"
9938af6a 4#include "commit.h"
5385f52d
JH
5#include "tree.h"
6#include "blob.h"
f3ab49db 7#include "tree-walk.h"
d556fae2 8#include "refs.h"
28fb8438 9#include "remote.h"
dbe44faa 10#include "dir.h"
fad6b9e5 11#include "sha1-array.h"
0317f455 12#include "packfile.h"
0d4a1321 13#include "object-store.h"
031dc927 14#include "repository.h"
8aac67a1 15#include "midx.h"
64043556 16#include "commit-reach.h"
9938af6a 17
e82caf38 18static int get_oid_oneline(const char *, struct object_id *, struct commit_list *);
32574b68 19
ef9b0370 20typedef int (*disambiguate_hint_fn)(struct repository *, const struct object_id *, void *);
a78fafe7
JH
21
22struct disambiguate_state {
0016043b 23 int len; /* length of prefix in hex chars */
dc01505f 24 char hex_pfx[GIT_MAX_HEXSZ + 1];
d2ee1185 25 struct object_id bin_pfx;
0016043b 26
ef9b0370 27 struct repository *repo;
a78fafe7
JH
28 disambiguate_hint_fn fn;
29 void *cb_data;
d2ee1185 30 struct object_id candidate;
a78fafe7
JH
31 unsigned candidate_exists:1;
32 unsigned candidate_checked:1;
33 unsigned candidate_ok:1;
34 unsigned disambiguate_fn_used:1;
35 unsigned ambiguous:1;
957d7406 36 unsigned always_call_fn:1;
a78fafe7
JH
37};
38
d2b7d9c7 39static void update_candidates(struct disambiguate_state *ds, const struct object_id *current)
a78fafe7 40{
957d7406 41 if (ds->always_call_fn) {
ef9b0370 42 ds->ambiguous = ds->fn(ds->repo, current, ds->cb_data) ? 1 : 0;
957d7406
JH
43 return;
44 }
a78fafe7
JH
45 if (!ds->candidate_exists) {
46 /* this is the first candidate */
d2b7d9c7 47 oidcpy(&ds->candidate, current);
a78fafe7
JH
48 ds->candidate_exists = 1;
49 return;
4a7e27e9 50 } else if (oideq(&ds->candidate, current)) {
a78fafe7
JH
51 /* the same as what we already have seen */
52 return;
53 }
54
55 if (!ds->fn) {
56 /* cannot disambiguate between ds->candidate and current */
57 ds->ambiguous = 1;
58 return;
59 }
60
61 if (!ds->candidate_checked) {
ef9b0370 62 ds->candidate_ok = ds->fn(ds->repo, &ds->candidate, ds->cb_data);
a78fafe7
JH
63 ds->disambiguate_fn_used = 1;
64 ds->candidate_checked = 1;
65 }
66
67 if (!ds->candidate_ok) {
749f763d 68 /* discard the candidate; we know it does not satisfy fn */
d2b7d9c7 69 oidcpy(&ds->candidate, current);
a78fafe7
JH
70 ds->candidate_checked = 0;
71 return;
72 }
73
74 /* if we reach this point, we know ds->candidate satisfies fn */
ef9b0370 75 if (ds->fn(ds->repo, current, ds->cb_data)) {
a78fafe7
JH
76 /*
77 * if both current and candidate satisfy fn, we cannot
78 * disambiguate.
79 */
80 ds->candidate_ok = 0;
81 ds->ambiguous = 1;
82 }
83
84 /* otherwise, current can be discarded and candidate is still good */
85}
86
cc817ca3
RS
87static int match_sha(unsigned, const unsigned char *, const unsigned char *);
88
0016043b 89static void find_short_object_filename(struct disambiguate_state *ds)
9938af6a 90{
263db403 91 struct object_directory *odb;
99a19b43 92
ef9b0370 93 for (odb = ds->repo->objects->odb; odb && !ds->ambiguous; odb = odb->next) {
cc817ca3 94 int pos;
0000d654 95 struct oid_array *loose_objects;
cc817ca3 96
0000d654
RS
97 loose_objects = odb_loose_cache(odb, &ds->bin_pfx);
98 pos = oid_array_lookup(loose_objects, &ds->bin_pfx);
cc817ca3
RS
99 if (pos < 0)
100 pos = -1 - pos;
0000d654 101 while (!ds->ambiguous && pos < loose_objects->nr) {
cc817ca3 102 const struct object_id *oid;
0000d654 103 oid = loose_objects->oid + pos;
cc817ca3
RS
104 if (!match_sha(ds->len, ds->bin_pfx.hash, oid->hash))
105 break;
106 update_candidates(ds, oid);
107 pos++;
9938af6a 108 }
9938af6a 109 }
9938af6a
JH
110}
111
112static int match_sha(unsigned len, const unsigned char *a, const unsigned char *b)
113{
114 do {
115 if (*a != *b)
116 return 0;
117 a++;
118 b++;
119 len -= 2;
120 } while (len > 1);
121 if (len)
122 if ((*a ^ *b) & 0xf0)
123 return 0;
124 return 1;
125}
126
8aac67a1
DS
127static void unique_in_midx(struct multi_pack_index *m,
128 struct disambiguate_state *ds)
129{
130 uint32_t num, i, first = 0;
131 const struct object_id *current = NULL;
132 num = m->num_objects;
133
134 if (!num)
135 return;
136
137 bsearch_midx(&ds->bin_pfx, m, &first);
138
139 /*
140 * At this point, "first" is the location of the lowest object
141 * with an object name that could match "bin_pfx". See if we have
142 * 0, 1 or more objects that actually match(es).
143 */
144 for (i = first; i < num && !ds->ambiguous; i++) {
145 struct object_id oid;
146 current = nth_midxed_object_oid(&oid, m, i);
147 if (!match_sha(ds->len, ds->bin_pfx.hash, current->hash))
148 break;
149 update_candidates(ds, current);
150 }
151}
152
0016043b 153static void unique_in_pack(struct packed_git *p,
a78fafe7 154 struct disambiguate_state *ds)
9938af6a 155{
902f5a21 156 uint32_t num, i, first = 0;
d2b7d9c7 157 const struct object_id *current = NULL;
f703e6ea 158
0e87b856
DS
159 if (open_pack_index(p) || !p->num_objects)
160 return;
161
f703e6ea 162 num = p->num_objects;
902f5a21 163 bsearch_pack(&ds->bin_pfx, p, &first);
f703e6ea
JH
164
165 /*
166 * At this point, "first" is the location of the lowest object
1703f9aa 167 * with an object name that could match "bin_pfx". See if we have
f703e6ea
JH
168 * 0, 1 or more objects that actually match(es).
169 */
a78fafe7 170 for (i = first; i < num && !ds->ambiguous; i++) {
d2b7d9c7 171 struct object_id oid;
172 current = nth_packed_object_oid(&oid, p, i);
173 if (!match_sha(ds->len, ds->bin_pfx.hash, current->hash))
f703e6ea 174 break;
a78fafe7 175 update_candidates(ds, current);
9938af6a 176 }
f703e6ea
JH
177}
178
0016043b 179static void find_short_packed_object(struct disambiguate_state *ds)
9938af6a 180{
8aac67a1 181 struct multi_pack_index *m;
9938af6a
JH
182 struct packed_git *p;
183
ef9b0370 184 for (m = get_multi_pack_index(ds->repo); m && !ds->ambiguous;
8aac67a1
DS
185 m = m->next)
186 unique_in_midx(m, ds);
ef9b0370 187 for (p = get_packed_git(ds->repo); p && !ds->ambiguous;
a80d72db 188 p = p->next)
0016043b 189 unique_in_pack(p, ds);
99a19b43
JH
190}
191
a78fafe7 192static int finish_object_disambiguation(struct disambiguate_state *ds,
e82caf38 193 struct object_id *oid)
99a19b43 194{
a78fafe7
JH
195 if (ds->ambiguous)
196 return SHORT_NAME_AMBIGUOUS;
99a19b43 197
a78fafe7 198 if (!ds->candidate_exists)
d1dd94b3 199 return MISSING_OBJECT;
a78fafe7
JH
200
201 if (!ds->candidate_checked)
202 /*
203 * If this is the only candidate, there is no point
204 * calling the disambiguation hint callback.
205 *
206 * On the other hand, if the current candidate
207 * replaced an earlier candidate that did _not_ pass
208 * the disambiguation hint callback, then we do have
209 * more than one objects that match the short name
210 * given, so we should make sure this one matches;
211 * otherwise, if we discovered this one and the one
212 * that we previously discarded in the reverse order,
213 * we would end up showing different results in the
214 * same repository!
215 */
216 ds->candidate_ok = (!ds->disambiguate_fn_used ||
ef9b0370 217 ds->fn(ds->repo, &ds->candidate, ds->cb_data));
a78fafe7
JH
218
219 if (!ds->candidate_ok)
013f276e 220 return SHORT_NAME_AMBIGUOUS;
a78fafe7 221
e82caf38 222 oidcpy(oid, &ds->candidate);
9938af6a
JH
223 return 0;
224}
225
ef9b0370
NTND
226static int disambiguate_commit_only(struct repository *r,
227 const struct object_id *oid,
228 void *cb_data_unused)
aa1dec9e 229{
ef9b0370 230 int kind = oid_object_info(r, oid, NULL);
aa1dec9e
JH
231 return kind == OBJ_COMMIT;
232}
233
ef9b0370
NTND
234static int disambiguate_committish_only(struct repository *r,
235 const struct object_id *oid,
236 void *cb_data_unused)
e2643617
JH
237{
238 struct object *obj;
239 int kind;
240
ef9b0370 241 kind = oid_object_info(r, oid, NULL);
e2643617
JH
242 if (kind == OBJ_COMMIT)
243 return 1;
244 if (kind != OBJ_TAG)
99a19b43 245 return 0;
e2643617
JH
246
247 /* We need to do this the hard way... */
ef9b0370 248 obj = deref_tag(r, parse_object(r, oid), NULL, 0);
e2643617
JH
249 if (obj && obj->type == OBJ_COMMIT)
250 return 1;
9938af6a
JH
251 return 0;
252}
253
ef9b0370
NTND
254static int disambiguate_tree_only(struct repository *r,
255 const struct object_id *oid,
256 void *cb_data_unused)
9938af6a 257{
ef9b0370 258 int kind = oid_object_info(r, oid, NULL);
daba53ae
JH
259 return kind == OBJ_TREE;
260}
9938af6a 261
ef9b0370
NTND
262static int disambiguate_treeish_only(struct repository *r,
263 const struct object_id *oid,
264 void *cb_data_unused)
daba53ae
JH
265{
266 struct object *obj;
267 int kind;
268
ef9b0370 269 kind = oid_object_info(r, oid, NULL);
daba53ae
JH
270 if (kind == OBJ_TREE || kind == OBJ_COMMIT)
271 return 1;
272 if (kind != OBJ_TAG)
273 return 0;
274
275 /* We need to do this the hard way... */
ef9b0370 276 obj = deref_tag(r, parse_object(r, oid), NULL, 0);
daba53ae
JH
277 if (obj && (obj->type == OBJ_TREE || obj->type == OBJ_COMMIT))
278 return 1;
279 return 0;
280}
281
ef9b0370
NTND
282static int disambiguate_blob_only(struct repository *r,
283 const struct object_id *oid,
284 void *cb_data_unused)
daba53ae 285{
ef9b0370 286 int kind = oid_object_info(r, oid, NULL);
daba53ae
JH
287 return kind == OBJ_BLOB;
288}
289
5b33cb1f
JK
290static disambiguate_hint_fn default_disambiguate_hint;
291
292int set_disambiguate_hint_config(const char *var, const char *value)
293{
294 static const struct {
295 const char *name;
296 disambiguate_hint_fn fn;
297 } hints[] = {
298 { "none", NULL },
299 { "commit", disambiguate_commit_only },
300 { "committish", disambiguate_committish_only },
301 { "tree", disambiguate_tree_only },
302 { "treeish", disambiguate_treeish_only },
303 { "blob", disambiguate_blob_only }
304 };
305 int i;
306
307 if (!value)
308 return config_error_nonbool(var);
309
310 for (i = 0; i < ARRAY_SIZE(hints); i++) {
311 if (!strcasecmp(value, hints[i].name)) {
312 default_disambiguate_hint = hints[i].fn;
313 return 0;
314 }
315 }
316
317 return error("unknown hint type for '%s': %s", var, value);
318}
319
ef9b0370
NTND
320static int init_object_disambiguation(struct repository *r,
321 const char *name, int len,
0016043b 322 struct disambiguate_state *ds)
9938af6a 323{
957d7406 324 int i;
9938af6a 325
7b38efad 326 if (len < MINIMUM_ABBREV || len > the_hash_algo->hexsz)
0016043b
JK
327 return -1;
328
329 memset(ds, 0, sizeof(*ds));
0016043b 330
af61c6e0 331 for (i = 0; i < len ;i++) {
9938af6a
JH
332 unsigned char c = name[i];
333 unsigned char val;
9938af6a
JH
334 if (c >= '0' && c <= '9')
335 val = c - '0';
336 else if (c >= 'a' && c <= 'f')
337 val = c - 'a' + 10;
338 else if (c >= 'A' && c <='F') {
339 val = c - 'A' + 10;
340 c -= 'A' - 'a';
341 }
342 else
343 return -1;
0016043b 344 ds->hex_pfx[i] = c;
9938af6a
JH
345 if (!(i & 1))
346 val <<= 4;
d2ee1185 347 ds->bin_pfx.hash[i >> 1] |= val;
9938af6a 348 }
0016043b
JK
349
350 ds->len = len;
59e4e34f 351 ds->hex_pfx[len] = '\0';
ef9b0370
NTND
352 ds->repo = r;
353 prepare_alt_odb(r);
957d7406
JH
354 return 0;
355}
356
1b7ba794 357static int show_ambiguous_object(const struct object_id *oid, void *data)
1ffa26c4
JK
358{
359 const struct disambiguate_state *ds = data;
360 struct strbuf desc = STRBUF_INIT;
361 int type;
362
ef9b0370 363 if (ds->fn && !ds->fn(ds->repo, oid, ds->cb_data))
1ffa26c4
JK
364 return 0;
365
ef9b0370 366 type = oid_object_info(ds->repo, oid, NULL);
1ffa26c4 367 if (type == OBJ_COMMIT) {
ef9b0370 368 struct commit *commit = lookup_commit(ds->repo, oid);
1ffa26c4
JK
369 if (commit) {
370 struct pretty_print_context pp = {0};
371 pp.date_mode.type = DATE_SHORT;
372 format_commit_message(commit, " %ad - %s", &desc, &pp);
373 }
374 } else if (type == OBJ_TAG) {
ef9b0370 375 struct tag *tag = lookup_tag(ds->repo, oid);
1ffa26c4
JK
376 if (!parse_tag(tag) && tag->tag)
377 strbuf_addf(&desc, " %s", tag->tag);
378 }
379
380 advise(" %s %s%s",
ef9b0370 381 repo_find_unique_abbrev(ds->repo, oid, DEFAULT_ABBREV),
debca9d2 382 type_name(type) ? type_name(type) : "unknown type",
1ffa26c4
JK
383 desc.buf);
384
385 strbuf_release(&desc);
386 return 0;
387}
388
a885c93b
ÆAB
389static int collect_ambiguous(const struct object_id *oid, void *data)
390{
391 oid_array_append(data, oid);
392 return 0;
393}
394
ef9b0370
NTND
395static int repo_collect_ambiguous(struct repository *r,
396 const struct object_id *oid,
397 void *data)
398{
399 return collect_ambiguous(oid, data);
400}
401
fae2ae45 402static struct repository *sort_ambiguous_repo;
5cc044e0
ÆAB
403static int sort_ambiguous(const void *a, const void *b)
404{
fae2ae45
NTND
405 int a_type = oid_object_info(sort_ambiguous_repo, a, NULL);
406 int b_type = oid_object_info(sort_ambiguous_repo, b, NULL);
5cc044e0
ÆAB
407 int a_type_sort;
408 int b_type_sort;
409
410 /*
411 * Sorts by hash within the same object type, just as
412 * oid_array_for_each_unique() would do.
413 */
414 if (a_type == b_type)
415 return oidcmp(a, b);
416
417 /*
418 * Between object types show tags, then commits, and finally
419 * trees and blobs.
420 *
421 * The object_type enum is commit, tree, blob, tag, but we
422 * want tag, commit, tree blob. Cleverly (perhaps too
423 * cleverly) do that with modulus, since the enum assigns 1 to
424 * commit, so tag becomes 0.
425 */
426 a_type_sort = a_type % 4;
427 b_type_sort = b_type % 4;
428 return a_type_sort > b_type_sort ? 1 : -1;
429}
430
fae2ae45
NTND
431static void sort_ambiguous_oid_array(struct repository *r, struct oid_array *a)
432{
433 /* mutex will be needed if this code is to be made thread safe */
434 sort_ambiguous_repo = r;
435 QSORT(a->oid, a->nr, sort_ambiguous);
436 sort_ambiguous_repo = NULL;
437}
438
c6c0235b
NTND
439static enum get_oid_result get_short_oid(struct repository *r,
440 const char *name, int len,
d1dd94b3
DT
441 struct object_id *oid,
442 unsigned flags)
957d7406
JH
443{
444 int status;
957d7406 445 struct disambiguate_state ds;
321c89bf 446 int quietly = !!(flags & GET_OID_QUIETLY);
957d7406 447
c6c0235b 448 if (init_object_disambiguation(r, name, len, &ds) < 0)
957d7406 449 return -1;
99a19b43 450
321c89bf 451 if (HAS_MULTI_BITS(flags & GET_OID_DISAMBIGUATORS))
033abf97 452 BUG("multiple get_short_oid disambiguator flags");
259942f5 453
321c89bf 454 if (flags & GET_OID_COMMIT)
aa1dec9e 455 ds.fn = disambiguate_commit_only;
321c89bf 456 else if (flags & GET_OID_COMMITTISH)
e2643617 457 ds.fn = disambiguate_committish_only;
321c89bf 458 else if (flags & GET_OID_TREE)
daba53ae 459 ds.fn = disambiguate_tree_only;
321c89bf 460 else if (flags & GET_OID_TREEISH)
daba53ae 461 ds.fn = disambiguate_treeish_only;
321c89bf 462 else if (flags & GET_OID_BLOB)
daba53ae 463 ds.fn = disambiguate_blob_only;
5b33cb1f
JK
464 else
465 ds.fn = default_disambiguate_hint;
aa1dec9e 466
0016043b
JK
467 find_short_object_filename(&ds);
468 find_short_packed_object(&ds);
e82caf38 469 status = finish_object_disambiguation(&ds, oid);
99a19b43 470
1ffa26c4 471 if (!quietly && (status == SHORT_NAME_AMBIGUOUS)) {
5cc044e0
ÆAB
472 struct oid_array collect = OID_ARRAY_INIT;
473
1ffa26c4
JK
474 error(_("short SHA1 %s is ambiguous"), ds.hex_pfx);
475
476 /*
477 * We may still have ambiguity if we simply saw a series of
478 * candidates that did not satisfy our hint function. In
479 * that case, we still want to show them, so disable the hint
480 * function entirely.
481 */
482 if (!ds.ambiguous)
483 ds.fn = NULL;
484
485 advise(_("The candidates are:"));
c6c0235b
NTND
486 repo_for_each_abbrev(r, ds.hex_pfx, collect_ambiguous, &collect);
487 sort_ambiguous_oid_array(r, &collect);
5cc044e0
ÆAB
488
489 if (oid_array_for_each(&collect, show_ambiguous_object, &ds))
490 BUG("show_ambiguous_object shouldn't return non-zero");
491 oid_array_clear(&collect);
1ffa26c4
JK
492 }
493
013f276e
JH
494 return status;
495}
496
4e99f2db
NTND
497int repo_for_each_abbrev(struct repository *r, const char *prefix,
498 each_abbrev_fn fn, void *cb_data)
957d7406 499{
910650d2 500 struct oid_array collect = OID_ARRAY_INIT;
957d7406 501 struct disambiguate_state ds;
fad6b9e5 502 int ret;
957d7406 503
4e99f2db 504 if (init_object_disambiguation(r, prefix, strlen(prefix), &ds) < 0)
957d7406 505 return -1;
957d7406 506
957d7406 507 ds.always_call_fn = 1;
ef9b0370 508 ds.fn = repo_collect_ambiguous;
fad6b9e5 509 ds.cb_data = &collect;
0016043b
JK
510 find_short_object_filename(&ds);
511 find_short_packed_object(&ds);
fad6b9e5 512
910650d2 513 ret = oid_array_for_each_unique(&collect, fn, cb_data);
514 oid_array_clear(&collect);
fad6b9e5 515 return ret;
957d7406
JH
516}
517
8e3f52d7
JK
518/*
519 * Return the slot of the most-significant bit set in "val". There are various
520 * ways to do this quickly with fls() or __builtin_clzl(), but speed is
521 * probably not a big deal here.
522 */
523static unsigned msb(unsigned long val)
524{
525 unsigned r = 0;
526 while (val >>= 1)
527 r++;
528 return r;
529}
530
5b20ace6
DS
531struct min_abbrev_data {
532 unsigned int init_len;
533 unsigned int cur_len;
534 char *hex;
7f07c033 535 struct repository *repo;
626fd982 536 const struct object_id *oid;
5b20ace6
DS
537};
538
a42d6fd2
DS
539static inline char get_hex_char_from_oid(const struct object_id *oid,
540 unsigned int pos)
541{
542 static const char hex[] = "0123456789abcdef";
543
544 if ((pos & 1) == 0)
545 return hex[oid->hash[pos >> 1] >> 4];
546 else
547 return hex[oid->hash[pos >> 1] & 0xf];
548}
549
5b20ace6 550static int extend_abbrev_len(const struct object_id *oid, void *cb_data)
013f276e 551{
5b20ace6 552 struct min_abbrev_data *mad = cb_data;
47dd0d59 553
5b20ace6 554 unsigned int i = mad->init_len;
a42d6fd2 555 while (mad->hex[i] && mad->hex[i] == get_hex_char_from_oid(oid, i))
5b20ace6
DS
556 i++;
557
558 if (i < GIT_MAX_RAWSZ && i >= mad->cur_len)
559 mad->cur_len = i + 1;
560
561 return 0;
562}
563
ef9b0370
NTND
564static int repo_extend_abbrev_len(struct repository *r,
565 const struct object_id *oid,
566 void *cb_data)
567{
568 return extend_abbrev_len(oid, cb_data);
569}
570
8aac67a1
DS
571static void find_abbrev_len_for_midx(struct multi_pack_index *m,
572 struct min_abbrev_data *mad)
573{
574 int match = 0;
575 uint32_t num, first = 0;
576 struct object_id oid;
577 const struct object_id *mad_oid;
578
579 if (!m->num_objects)
580 return;
581
582 num = m->num_objects;
583 mad_oid = mad->oid;
584 match = bsearch_midx(mad_oid, m, &first);
585
586 /*
587 * first is now the position in the packfile where we would insert
588 * mad->hash if it does not exist (or the position of mad->hash if
589 * it does exist). Hence, we consider a maximum of two objects
590 * nearby for the abbreviation length.
591 */
592 mad->init_len = 0;
593 if (!match) {
594 if (nth_midxed_object_oid(&oid, m, first))
595 extend_abbrev_len(&oid, mad);
596 } else if (first < num - 1) {
597 if (nth_midxed_object_oid(&oid, m, first + 1))
598 extend_abbrev_len(&oid, mad);
599 }
600 if (first > 0) {
601 if (nth_midxed_object_oid(&oid, m, first - 1))
602 extend_abbrev_len(&oid, mad);
603 }
604 mad->init_len = mad->cur_len;
605}
606
0e87b856
DS
607static void find_abbrev_len_for_pack(struct packed_git *p,
608 struct min_abbrev_data *mad)
013f276e 609{
0e87b856 610 int match = 0;
0aaf05b3 611 uint32_t num, first = 0;
0e87b856 612 struct object_id oid;
0aaf05b3 613 const struct object_id *mad_oid;
0e87b856
DS
614
615 if (open_pack_index(p) || !p->num_objects)
616 return;
617
618 num = p->num_objects;
0aaf05b3
DS
619 mad_oid = mad->oid;
620 match = bsearch_pack(mad_oid, p, &first);
0e87b856
DS
621
622 /*
623 * first is now the position in the packfile where we would insert
624 * mad->hash if it does not exist (or the position of mad->hash if
21abed50 625 * it does exist). Hence, we consider a maximum of two objects
0e87b856
DS
626 * nearby for the abbreviation length.
627 */
628 mad->init_len = 0;
629 if (!match) {
21abed50
DS
630 if (nth_packed_object_oid(&oid, p, first))
631 extend_abbrev_len(&oid, mad);
0e87b856 632 } else if (first < num - 1) {
21abed50
DS
633 if (nth_packed_object_oid(&oid, p, first + 1))
634 extend_abbrev_len(&oid, mad);
0e87b856
DS
635 }
636 if (first > 0) {
21abed50
DS
637 if (nth_packed_object_oid(&oid, p, first - 1))
638 extend_abbrev_len(&oid, mad);
0e87b856
DS
639 }
640 mad->init_len = mad->cur_len;
641}
642
643static void find_abbrev_len_packed(struct min_abbrev_data *mad)
644{
8aac67a1 645 struct multi_pack_index *m;
0e87b856
DS
646 struct packed_git *p;
647
7f07c033 648 for (m = get_multi_pack_index(mad->repo); m; m = m->next)
8aac67a1 649 find_abbrev_len_for_midx(m, mad);
7f07c033 650 for (p = get_packed_git(mad->repo); p; p = p->next)
0e87b856
DS
651 find_abbrev_len_for_pack(p, mad);
652}
653
8bb95572
NTND
654int repo_find_unique_abbrev_r(struct repository *r, char *hex,
655 const struct object_id *oid, int len)
5b20ace6
DS
656{
657 struct disambiguate_state ds;
658 struct min_abbrev_data mad;
659 struct object_id oid_ret;
8bb95572 660 const unsigned hexsz = r->hash_algo->hexsz;
7b38efad 661
e6c587c7 662 if (len < 0) {
8bb95572 663 unsigned long count = repo_approximate_object_count(r);
8e3f52d7
JK
664 /*
665 * Add one because the MSB only tells us the highest bit set,
666 * not including the value of all the _other_ bits (so "15"
667 * is only one off of 2^4, but the MSB is the 3rd bit.
668 */
669 len = msb(count) + 1;
670 /*
671 * We now know we have on the order of 2^len objects, which
672 * expects a collision at 2^(len/2). But we also care about hex
673 * chars, not bits, and there are 4 bits per hex. So all
42c78a21 674 * together we need to divide by 2 and round up.
8e3f52d7 675 */
42c78a21 676 len = DIV_ROUND_UP(len, 2);
8e3f52d7
JK
677 /*
678 * For very small repos, we stick with our regular fallback.
679 */
680 if (len < FALLBACK_DEFAULT_ABBREV)
681 len = FALLBACK_DEFAULT_ABBREV;
e6c587c7 682 }
8e3f52d7 683
aab9583f 684 oid_to_hex_r(hex, oid);
7b38efad 685 if (len == hexsz || !len)
686 return hexsz;
5b20ace6 687
8bb95572 688 mad.repo = r;
5b20ace6
DS
689 mad.init_len = len;
690 mad.cur_len = len;
691 mad.hex = hex;
626fd982 692 mad.oid = oid;
0e87b856
DS
693
694 find_abbrev_len_packed(&mad);
695
ef9b0370 696 if (init_object_disambiguation(r, hex, mad.cur_len, &ds) < 0)
0e87b856 697 return -1;
5b20ace6 698
ef9b0370 699 ds.fn = repo_extend_abbrev_len;
5b20ace6
DS
700 ds.always_call_fn = 1;
701 ds.cb_data = (void *)&mad;
702
703 find_short_object_filename(&ds);
5b20ace6
DS
704 (void)finish_object_disambiguation(&ds, &oid_ret);
705
706 hex[mad.cur_len] = 0;
707 return mad.cur_len;
af49c6d0
JK
708}
709
8bb95572
NTND
710const char *repo_find_unique_abbrev(struct repository *r,
711 const struct object_id *oid,
712 int len)
af49c6d0 713{
ef2ed501 714 static int bufno;
dc01505f 715 static char hexbuffer[4][GIT_MAX_HEXSZ + 1];
3e98919a
RS
716 char *hex = hexbuffer[bufno];
717 bufno = (bufno + 1) % ARRAY_SIZE(hexbuffer);
8bb95572 718 repo_find_unique_abbrev_r(r, hex, oid, len);
b66fde9a 719 return hex;
9938af6a
JH
720}
721
6677c466 722static int ambiguous_path(const char *path, int len)
af13cdf2
LT
723{
724 int slash = 1;
6677c466 725 int cnt;
af13cdf2 726
6677c466 727 for (cnt = 0; cnt < len; cnt++) {
af13cdf2
LT
728 switch (*path++) {
729 case '\0':
730 break;
731 case '/':
732 if (slash)
733 break;
734 slash = 1;
735 continue;
736 case '.':
737 continue;
738 default:
739 slash = 0;
740 continue;
741 }
c054d64e 742 break;
af13cdf2 743 }
6677c466 744 return slash;
af13cdf2
LT
745}
746
a1ad0eb0
JK
747static inline int at_mark(const char *string, int len,
748 const char **suffix, int nr)
ae0ba8e2 749{
ae0ba8e2
JH
750 int i;
751
a1ad0eb0 752 for (i = 0; i < nr; i++) {
ae0ba8e2
JH
753 int suffix_len = strlen(suffix[i]);
754 if (suffix_len <= len
244ea1b5 755 && !strncasecmp(string, suffix[i], suffix_len))
ae0ba8e2
JH
756 return suffix_len;
757 }
758 return 0;
759}
760
a1ad0eb0
JK
761static inline int upstream_mark(const char *string, int len)
762{
763 const char *suffix[] = { "@{upstream}", "@{u}" };
764 return at_mark(string, len, suffix, ARRAY_SIZE(suffix));
765}
766
adfe5d04
JK
767static inline int push_mark(const char *string, int len)
768{
769 const char *suffix[] = { "@{push}" };
770 return at_mark(string, len, suffix, ARRAY_SIZE(suffix));
771}
772
d1dd94b3 773static enum get_oid_result get_oid_1(const char *name, int len, struct object_id *oid, unsigned lookup_flags);
23a57129 774static int interpret_nth_prior_checkout(struct repository *r, const char *name, int namelen, struct strbuf *buf);
d18ba221 775
e82caf38 776static int get_oid_basic(const char *str, int len, struct object_id *oid,
c41a87dd 777 unsigned int flags)
e86eb666 778{
eedce784 779 static const char *warn_msg = "refname '%.*s' is ambiguous.";
798c35fc
NTND
780 static const char *object_name_msg = N_(
781 "Git normally never creates a ref that ends with 40 hex characters\n"
782 "because it will be ignored when you just specify 40-hex. These refs\n"
783 "may be created by mistake. For example,\n"
784 "\n"
785 " git checkout -b $br $(git rev-parse ...)\n"
786 "\n"
787 "where \"$br\" is somehow empty and a 40-hex ref is created. Please\n"
788 "examine these refs and maybe delete them. Turn this message off by\n"
8dc84fdc 789 "running \"git config advice.objectNameWarning false\"");
e82caf38 790 struct object_id tmp_oid;
ed378ec7 791 char *real_ref = NULL;
ab2a1a32 792 int refs_found = 0;
128fd54d 793 int at, reflog_len, nth_prior = 0;
9938af6a 794
7b38efad 795 if (len == the_hash_algo->hexsz && !get_oid_hex(str, oid)) {
832cf74c 796 if (warn_ambiguous_refs && warn_on_object_refname_ambiguity) {
cca5fa64 797 refs_found = dwim_ref(str, len, &tmp_oid, &real_ref);
832cf74c 798 if (refs_found > 0) {
25fba78d
JK
799 warning(warn_msg, len, str);
800 if (advice_object_name_warning)
801 fprintf(stderr, "%s\n", _(object_name_msg));
802 }
803 free(real_ref);
798c35fc 804 }
9938af6a 805 return 0;
798c35fc 806 }
9938af6a 807
d18ba221 808 /* basic@{time or number or -number} format to query ref-log */
694500ed 809 reflog_len = at = 0;
f265458f 810 if (len && str[len-1] == '}') {
e883a057 811 for (at = len-4; at >= 0; at--) {
ab2a1a32 812 if (str[at] == '@' && str[at+1] == '{') {
83d16bc7
RR
813 if (str[at+2] == '-') {
814 if (at != 0)
815 /* @{-N} not at start */
816 return -1;
128fd54d
FC
817 nth_prior = 1;
818 continue;
819 }
adfe5d04
JK
820 if (!upstream_mark(str + at, len - at) &&
821 !push_mark(str + at, len - at)) {
28fb8438
JS
822 reflog_len = (len-1) - (at+2);
823 len = at;
824 }
ab2a1a32
JH
825 break;
826 }
d556fae2
SP
827 }
828 }
829
af13cdf2 830 /* Accept only unambiguous ref paths. */
11cf8801 831 if (len && ambiguous_path(str, len))
af13cdf2
LT
832 return -1;
833
128fd54d 834 if (nth_prior) {
d18ba221 835 struct strbuf buf = STRBUF_INIT;
128fd54d
FC
836 int detached;
837
23a57129 838 if (interpret_nth_prior_checkout(the_repository, str, len, &buf) > 0) {
7b38efad 839 detached = (buf.len == the_hash_algo->hexsz && !get_oid_hex(buf.buf, oid));
128fd54d
FC
840 strbuf_release(&buf);
841 if (detached)
842 return 0;
d18ba221 843 }
128fd54d
FC
844 }
845
846 if (!len && reflog_len)
11cf8801 847 /* allow "@{...}" to mean the current branch reflog */
cca5fa64 848 refs_found = dwim_ref("HEAD", 4, oid, &real_ref);
128fd54d 849 else if (reflog_len)
334dc52f 850 refs_found = dwim_log(str, len, oid, &real_ref);
f2eba66d 851 else
cca5fa64 852 refs_found = dwim_ref(str, len, oid, &real_ref);
d556fae2
SP
853
854 if (!refs_found)
855 return -1;
856
321c89bf 857 if (warn_ambiguous_refs && !(flags & GET_OID_QUIETLY) &&
798c35fc 858 (refs_found > 1 ||
c6c0235b
NTND
859 !get_short_oid(the_repository,
860 str, len, &tmp_oid, GET_OID_QUIETLY)))
eedce784 861 warning(warn_msg, len, str);
d556fae2 862
ab2a1a32 863 if (reflog_len) {
ab2a1a32 864 int nth, i;
dddbad72
JS
865 timestamp_t at_time;
866 timestamp_t co_time;
16d7cc90
JH
867 int co_tz, co_cnt;
868
fe558516 869 /* Is it asking for N-th entry, or approxidate? */
ab2a1a32
JH
870 for (i = nth = 0; 0 <= nth && i < reflog_len; i++) {
871 char ch = str[at+2+i];
872 if ('0' <= ch && ch <= '9')
873 nth = nth * 10 + ch - '0';
874 else
875 nth = -1;
876 }
ea360dd0
SP
877 if (100000000 <= nth) {
878 at_time = nth;
879 nth = -1;
880 } else if (0 <= nth)
ab2a1a32 881 at_time = 0;
861f00e3 882 else {
93cfa7c7 883 int errors = 0;
861f00e3 884 char *tmp = xstrndup(str + at + 2, reflog_len);
93cfa7c7 885 at_time = approxidate_careful(tmp, &errors);
861f00e3 886 free(tmp);
28b35632
JK
887 if (errors) {
888 free(real_ref);
a5e10acb 889 return -1;
28b35632 890 }
861f00e3 891 }
7fdff474
NTND
892 if (read_ref_at(get_main_ref_store(the_repository),
893 real_ref, flags, at_time, nth, oid, NULL,
16d7cc90 894 &co_time, &co_tz, &co_cnt)) {
305ebea0 895 if (!len) {
59556548 896 if (starts_with(real_ref, "refs/heads/")) {
305ebea0
RR
897 str = real_ref + 11;
898 len = strlen(real_ref + 11);
899 } else {
900 /* detached HEAD */
901 str = "HEAD";
902 len = 4;
903 }
904 }
c41a87dd 905 if (at_time) {
321c89bf 906 if (!(flags & GET_OID_QUIETLY)) {
c41a87dd
DA
907 warning("Log for '%.*s' only goes "
908 "back to %s.", len, str,
a5481a6c 909 show_date(co_time, co_tz, DATE_MODE(RFC2822)));
c41a87dd
DA
910 }
911 } else {
321c89bf 912 if (flags & GET_OID_QUIETLY) {
c41a87dd
DA
913 exit(128);
914 }
e6eedc31
JS
915 die("Log for '%.*s' only has %d entries.",
916 len, str, co_cnt);
917 }
16d7cc90 918 }
d556fae2
SP
919 }
920
ed378ec7 921 free(real_ref);
d556fae2 922 return 0;
9938af6a
JH
923}
924
d1dd94b3
DT
925static enum get_oid_result get_parent(const char *name, int len,
926 struct object_id *result, int idx)
9938af6a 927{
1e43ed98 928 struct object_id oid;
d1dd94b3
DT
929 enum get_oid_result ret = get_oid_1(name, len, &oid,
930 GET_OID_COMMITTISH);
9938af6a
JH
931 struct commit *commit;
932 struct commit_list *p;
933
934 if (ret)
935 return ret;
2122f675 936 commit = lookup_commit_reference(the_repository, &oid);
9938af6a 937 if (parse_commit(commit))
d1dd94b3 938 return MISSING_OBJECT;
9938af6a 939 if (!idx) {
e82caf38 940 oidcpy(result, &commit->object.oid);
d1dd94b3 941 return FOUND;
9938af6a
JH
942 }
943 p = commit->parents;
944 while (p) {
945 if (!--idx) {
e82caf38 946 oidcpy(result, &p->item->object.oid);
d1dd94b3 947 return FOUND;
9938af6a
JH
948 }
949 p = p->next;
950 }
d1dd94b3 951 return MISSING_OBJECT;
9938af6a
JH
952}
953
d1dd94b3
DT
954static enum get_oid_result get_nth_ancestor(const char *name, int len,
955 struct object_id *result,
956 int generation)
4f7599ac 957{
1e43ed98 958 struct object_id oid;
621ff675
LT
959 struct commit *commit;
960 int ret;
961
321c89bf 962 ret = get_oid_1(name, len, &oid, GET_OID_COMMITTISH);
4f7599ac
JH
963 if (ret)
964 return ret;
2122f675 965 commit = lookup_commit_reference(the_repository, &oid);
621ff675 966 if (!commit)
d1dd94b3 967 return MISSING_OBJECT;
4f7599ac
JH
968
969 while (generation--) {
621ff675 970 if (parse_commit(commit) || !commit->parents)
d1dd94b3 971 return MISSING_OBJECT;
621ff675 972 commit = commit->parents->item;
4f7599ac 973 }
e82caf38 974 oidcpy(result, &commit->object.oid);
d1dd94b3 975 return FOUND;
4f7599ac
JH
976}
977
81776315
JH
978struct object *peel_to_type(const char *name, int namelen,
979 struct object *o, enum object_type expected_type)
980{
981 if (name && !namelen)
982 namelen = strlen(name);
81776315 983 while (1) {
109cd76d 984 if (!o || (!o->parsed && !parse_object(the_repository, &o->oid)))
81776315 985 return NULL;
a6a3f2cc 986 if (expected_type == OBJ_ANY || o->type == expected_type)
81776315
JH
987 return o;
988 if (o->type == OBJ_TAG)
989 o = ((struct tag*) o)->tagged;
990 else if (o->type == OBJ_COMMIT)
2e27bd77 991 o = &(get_commit_tree(((struct commit *)o))->object);
81776315
JH
992 else {
993 if (name)
994 error("%.*s: expected %s type, but the object "
995 "dereferences to %s type",
debca9d2
BW
996 namelen, name, type_name(expected_type),
997 type_name(o->type));
81776315
JH
998 return NULL;
999 }
1000 }
1001}
1002
e82caf38 1003static int peel_onion(const char *name, int len, struct object_id *oid,
8a10fea4 1004 unsigned lookup_flags)
5385f52d 1005{
de37d50d 1006 struct object_id outer;
5385f52d 1007 const char *sp;
885a86ab 1008 unsigned int expected_type = 0;
5385f52d
JH
1009 struct object *o;
1010
1011 /*
1012 * "ref^{type}" dereferences ref repeatedly until you cannot
1013 * dereference anymore, or you get an object of given type,
1014 * whichever comes first. "ref^{}" means just dereference
1015 * tags until you get a non-tag. "ref^0" is a shorthand for
1016 * "ref^{commit}". "commit^{tree}" could be used to find the
1017 * top-level tree of the given commit.
1018 */
1019 if (len < 4 || name[len-1] != '}')
1020 return -1;
1021
1022 for (sp = name + len - 1; name <= sp; sp--) {
1023 int ch = *sp;
1024 if (ch == '{' && name < sp && sp[-1] == '^')
1025 break;
1026 }
1027 if (sp <= name)
1028 return -1;
1029
1030 sp++; /* beginning of type name, or closing brace for empty */
59556548 1031 if (starts_with(sp, "commit}"))
1974632c 1032 expected_type = OBJ_COMMIT;
59556548 1033 else if (starts_with(sp, "tag}"))
75aa26d3 1034 expected_type = OBJ_TAG;
59556548 1035 else if (starts_with(sp, "tree}"))
1974632c 1036 expected_type = OBJ_TREE;
59556548 1037 else if (starts_with(sp, "blob}"))
1974632c 1038 expected_type = OBJ_BLOB;
59556548 1039 else if (starts_with(sp, "object}"))
a6a3f2cc 1040 expected_type = OBJ_ANY;
5385f52d 1041 else if (sp[0] == '}')
1974632c 1042 expected_type = OBJ_NONE;
32574b68
NTND
1043 else if (sp[0] == '/')
1044 expected_type = OBJ_COMMIT;
5385f52d
JH
1045 else
1046 return -1;
1047
321c89bf 1048 lookup_flags &= ~GET_OID_DISAMBIGUATORS;
e2643617 1049 if (expected_type == OBJ_COMMIT)
321c89bf 1050 lookup_flags |= GET_OID_COMMITTISH;
ed1ca602 1051 else if (expected_type == OBJ_TREE)
321c89bf 1052 lookup_flags |= GET_OID_TREEISH;
e2643617 1053
e82caf38 1054 if (get_oid_1(name, sp - name - 2, &outer, lookup_flags))
5385f52d
JH
1055 return -1;
1056
109cd76d 1057 o = parse_object(the_repository, &outer);
5385f52d
JH
1058 if (!o)
1059 return -1;
885a86ab 1060 if (!expected_type) {
a74093da 1061 o = deref_tag(the_repository, o, name, sp - name - 2);
109cd76d 1062 if (!o || (!o->parsed && !parse_object(the_repository, &o->oid)))
6e1c6c10 1063 return -1;
e82caf38 1064 oidcpy(oid, &o->oid);
32574b68 1065 return 0;
5385f52d 1066 }
32574b68
NTND
1067
1068 /*
1069 * At this point, the syntax look correct, so
1070 * if we do not get the needed object, we should
1071 * barf.
1072 */
1073 o = peel_to_type(name, len, o, expected_type);
1074 if (!o)
81776315 1075 return -1;
32574b68 1076
e82caf38 1077 oidcpy(oid, &o->oid);
32574b68
NTND
1078 if (sp[0] == '/') {
1079 /* "$commit^{/foo}" */
1080 char *prefix;
1081 int ret;
1082 struct commit_list *list = NULL;
1083
81776315 1084 /*
4322842a
NTND
1085 * $commit^{/}. Some regex implementation may reject.
1086 * We don't need regex anyway. '' pattern always matches.
5385f52d 1087 */
4322842a 1088 if (sp[1] == '}')
81776315 1089 return 0;
4322842a 1090
32574b68
NTND
1091 prefix = xstrndup(sp + 1, name + len - 1 - (sp + 1));
1092 commit_list_insert((struct commit *)o, &list);
e82caf38 1093 ret = get_oid_oneline(prefix, oid, list);
32574b68
NTND
1094 free(prefix);
1095 return ret;
5385f52d
JH
1096 }
1097 return 0;
1098}
1099
e82caf38 1100static int get_describe_name(const char *name, int len, struct object_id *oid)
7dd45e15
JH
1101{
1102 const char *cp;
321c89bf 1103 unsigned flags = GET_OID_QUIETLY | GET_OID_COMMIT;
7dd45e15
JH
1104
1105 for (cp = name + len - 1; name + 2 <= cp; cp--) {
1106 char ch = *cp;
6f75d45b 1107 if (!isxdigit(ch)) {
7dd45e15
JH
1108 /* We must be looking at g in "SOMETHING-g"
1109 * for it to be describe output.
1110 */
1111 if (ch == 'g' && cp[-1] == '-') {
1112 cp++;
1113 len -= cp - name;
c6c0235b
NTND
1114 return get_short_oid(the_repository,
1115 cp, len, oid, flags);
7dd45e15
JH
1116 }
1117 }
1118 }
1119 return -1;
1120}
1121
d1dd94b3
DT
1122static enum get_oid_result get_oid_1(const char *name, int len,
1123 struct object_id *oid,
1124 unsigned lookup_flags)
9938af6a 1125{
0601dbe1 1126 int ret, has_suffix;
4f7599ac 1127 const char *cp;
9938af6a 1128
621ff675
LT
1129 /*
1130 * "name~3" is "name^^^", "name~" is "name~1", and "name^" is "name^1".
4f7599ac 1131 */
0601dbe1 1132 has_suffix = 0;
4f7599ac
JH
1133 for (cp = name + len - 1; name <= cp; cp--) {
1134 int ch = *cp;
1135 if ('0' <= ch && ch <= '9')
1136 continue;
0601dbe1
JH
1137 if (ch == '~' || ch == '^')
1138 has_suffix = ch;
4f7599ac
JH
1139 break;
1140 }
0601dbe1
JH
1141
1142 if (has_suffix) {
1143 int num = 0;
4f7599ac
JH
1144 int len1 = cp - name;
1145 cp++;
1146 while (cp < name + len)
0601dbe1 1147 num = num * 10 + *cp++ - '0';
621ff675
LT
1148 if (!num && len1 == len - 1)
1149 num = 1;
1150 if (has_suffix == '^')
e82caf38 1151 return get_parent(name, len1, oid, num);
0601dbe1 1152 /* else if (has_suffix == '~') -- goes without saying */
e82caf38 1153 return get_nth_ancestor(name, len1, oid, num);
4f7599ac
JH
1154 }
1155
e82caf38 1156 ret = peel_onion(name, len, oid, lookup_flags);
5385f52d 1157 if (!ret)
d1dd94b3 1158 return FOUND;
5385f52d 1159
e82caf38 1160 ret = get_oid_basic(name, len, oid, lookup_flags);
9938af6a 1161 if (!ret)
d1dd94b3 1162 return FOUND;
7dd45e15
JH
1163
1164 /* It could be describe output that is "SOMETHING-gXXXX" */
e82caf38 1165 ret = get_describe_name(name, len, oid);
7dd45e15 1166 if (!ret)
d1dd94b3 1167 return FOUND;
7dd45e15 1168
c6c0235b 1169 return get_short_oid(the_repository, name, len, oid, lookup_flags);
9938af6a
JH
1170}
1171
f7bff003
JH
1172/*
1173 * This interprets names like ':/Initial revision of "git"' by searching
1174 * through history and returning the first commit whose message starts
3d045897 1175 * the given regular expression.
f7bff003 1176 *
0769854f
WP
1177 * For negative-matching, prefix the pattern-part with '!-', like: ':/!-WIP'.
1178 *
1179 * For a literal '!' character at the beginning of a pattern, you have to repeat
1180 * that, like: ':/!!foo'
1181 *
1182 * For future extension, all other sequences beginning with ':/!' are reserved.
f7bff003 1183 */
208acbfb
NTND
1184
1185/* Remember to update object flag allocation in object.h */
f7bff003
JH
1186#define ONELINE_SEEN (1u<<20)
1187
9c5fe0b8
MH
1188static int handle_one_ref(const char *path, const struct object_id *oid,
1189 int flag, void *cb_data)
28a4d940
JS
1190{
1191 struct commit_list **list = cb_data;
109cd76d 1192 struct object *object = parse_object(the_repository, oid);
28a4d940
JS
1193 if (!object)
1194 return 0;
affeef12 1195 if (object->type == OBJ_TAG) {
a74093da
SB
1196 object = deref_tag(the_repository, object, path,
1197 strlen(path));
affeef12
MK
1198 if (!object)
1199 return 0;
1200 }
28a4d940
JS
1201 if (object->type != OBJ_COMMIT)
1202 return 0;
e8d1dfe6 1203 commit_list_insert((struct commit *)object, list);
28a4d940
JS
1204 return 0;
1205}
1206
e82caf38 1207static int get_oid_oneline(const char *prefix, struct object_id *oid,
84baa31b 1208 struct commit_list *list)
28a4d940 1209{
84baa31b 1210 struct commit_list *backup = NULL, *l;
28042dbc 1211 int found = 0;
0769854f 1212 int negative = 0;
57895105 1213 regex_t regex;
28a4d940
JS
1214
1215 if (prefix[0] == '!') {
28a4d940 1216 prefix++;
0769854f
WP
1217
1218 if (prefix[0] == '-') {
1219 prefix++;
1220 negative = 1;
1221 } else if (prefix[0] != '!') {
e6a6a768 1222 return -1;
0769854f 1223 }
28a4d940 1224 }
57895105
LT
1225
1226 if (regcomp(&regex, prefix, REG_EXTENDED))
aac4fac1 1227 return -1;
57895105 1228
84baa31b
NTND
1229 for (l = list; l; l = l->next) {
1230 l->item->object.flags |= ONELINE_SEEN;
28a4d940 1231 commit_list_insert(l->item, &backup);
84baa31b 1232 }
ed8ad7e2 1233 while (list) {
ba41c1c9 1234 const char *p, *buf;
1358e7d6 1235 struct commit *commit;
28042dbc 1236 int matches;
ed8ad7e2
JM
1237
1238 commit = pop_most_recent_commit(&list, ONELINE_SEEN);
109cd76d 1239 if (!parse_object(the_repository, &commit->object.oid))
283cdbcf 1240 continue;
8597ea3a 1241 buf = get_commit_buffer(commit, NULL);
ba41c1c9 1242 p = strstr(buf, "\n\n");
0769854f 1243 matches = negative ^ (p && !regexec(&regex, p + 2, 0, NULL, 0));
ba41c1c9 1244 unuse_commit_buffer(commit, buf);
28042dbc
JH
1245
1246 if (matches) {
e82caf38 1247 oidcpy(oid, &commit->object.oid);
28042dbc 1248 found = 1;
28a4d940
JS
1249 break;
1250 }
1251 }
57895105 1252 regfree(&regex);
28a4d940
JS
1253 free_commit_list(list);
1254 for (l = backup; l; l = l->next)
1255 clear_commit_marks(l->item, ONELINE_SEEN);
28042dbc
JH
1256 free_commit_list(backup);
1257 return found ? 0 : -1;
28a4d940
JS
1258}
1259
ae5a6c36 1260struct grab_nth_branch_switch_cbdata {
98f85ff4
JH
1261 int remaining;
1262 struct strbuf buf;
ae5a6c36
JH
1263};
1264
9461d272 1265static int grab_nth_branch_switch(struct object_id *ooid, struct object_id *noid,
dddbad72 1266 const char *email, timestamp_t timestamp, int tz,
ae5a6c36
JH
1267 const char *message, void *cb_data)
1268{
1269 struct grab_nth_branch_switch_cbdata *cb = cb_data;
a884d0cb
TR
1270 const char *match = NULL, *target = NULL;
1271 size_t len;
1272
95b567c7 1273 if (skip_prefix(message, "checkout: moving from ", &match))
d7c03c1f 1274 target = strstr(match, " to ");
ae5a6c36 1275
c829774c 1276 if (!match || !target)
ae5a6c36 1277 return 0;
98f85ff4
JH
1278 if (--(cb->remaining) == 0) {
1279 len = target - match;
1280 strbuf_reset(&cb->buf);
1281 strbuf_add(&cb->buf, match, len);
1282 return 1; /* we are done */
1283 }
ae5a6c36
JH
1284 return 0;
1285}
1286
1287/*
ae0ba8e2
JH
1288 * Parse @{-N} syntax, return the number of characters parsed
1289 * if successful; otherwise signal an error with negative value.
ae5a6c36 1290 */
23a57129
NTND
1291static int interpret_nth_prior_checkout(struct repository *r,
1292 const char *name, int namelen,
8cd4249c 1293 struct strbuf *buf)
ae5a6c36 1294{
c2883e62 1295 long nth;
98f85ff4 1296 int retval;
ae5a6c36 1297 struct grab_nth_branch_switch_cbdata cb;
a884d0cb
TR
1298 const char *brace;
1299 char *num_end;
ae5a6c36 1300
8cd4249c
JK
1301 if (namelen < 4)
1302 return -1;
ae5a6c36
JH
1303 if (name[0] != '@' || name[1] != '{' || name[2] != '-')
1304 return -1;
8cd4249c 1305 brace = memchr(name, '}', namelen);
a884d0cb
TR
1306 if (!brace)
1307 return -1;
98f85ff4 1308 nth = strtol(name + 3, &num_end, 10);
a884d0cb 1309 if (num_end != brace)
ae5a6c36 1310 return -1;
c2883e62
JH
1311 if (nth <= 0)
1312 return -1;
98f85ff4
JH
1313 cb.remaining = nth;
1314 strbuf_init(&cb.buf, 20);
1315
23a57129
NTND
1316 retval = refs_for_each_reflog_ent_reverse(get_main_ref_store(r),
1317 "HEAD", grab_nth_branch_switch, &cb);
1318 if (0 < retval) {
98f85ff4 1319 strbuf_reset(buf);
e992d1eb 1320 strbuf_addbuf(buf, &cb.buf);
98f85ff4 1321 retval = brace - name + 1;
23a57129
NTND
1322 } else
1323 retval = 0;
a884d0cb 1324
98f85ff4 1325 strbuf_release(&cb.buf);
39765e59 1326 return retval;
ae5a6c36
JH
1327}
1328
151b2911 1329int get_oid_mb(const char *name, struct object_id *oid)
619a644d
JH
1330{
1331 struct commit *one, *two;
1332 struct commit_list *mbs;
151b2911 1333 struct object_id oid_tmp;
619a644d
JH
1334 const char *dots;
1335 int st;
1336
1337 dots = strstr(name, "...");
1338 if (!dots)
151b2911 1339 return get_oid(name, oid);
619a644d 1340 if (dots == name)
151b2911 1341 st = get_oid("HEAD", &oid_tmp);
619a644d
JH
1342 else {
1343 struct strbuf sb;
1344 strbuf_init(&sb, dots - name);
1345 strbuf_add(&sb, name, dots - name);
e82caf38 1346 st = get_oid_committish(sb.buf, &oid_tmp);
619a644d
JH
1347 strbuf_release(&sb);
1348 }
1349 if (st)
1350 return st;
21e1ee8f 1351 one = lookup_commit_reference_gently(the_repository, &oid_tmp, 0);
619a644d
JH
1352 if (!one)
1353 return -1;
1354
e82caf38 1355 if (get_oid_committish(dots[3] ? (dots + 3) : "HEAD", &oid_tmp))
619a644d 1356 return -1;
21e1ee8f 1357 two = lookup_commit_reference_gently(the_repository, &oid_tmp, 0);
619a644d
JH
1358 if (!two)
1359 return -1;
2ce406cc 1360 mbs = get_merge_bases(one, two);
619a644d
JH
1361 if (!mbs || mbs->next)
1362 st = -1;
1363 else {
1364 st = 0;
151b2911 1365 oidcpy(oid, &mbs->item->object.oid);
619a644d
JH
1366 }
1367 free_commit_list(mbs);
1368 return st;
1369}
1370
9ba89f48
FC
1371/* parse @something syntax, when 'something' is not {.*} */
1372static int interpret_empty_at(const char *name, int namelen, int len, struct strbuf *buf)
1373{
1374 const char *next;
1375
1376 if (len || name[1] == '{')
1377 return -1;
1378
1379 /* make sure it's a single @, or @@{.*}, not @foo */
8cd4249c 1380 next = memchr(name + len + 1, '@', namelen - len - 1);
9ba89f48
FC
1381 if (next && next[1] != '{')
1382 return -1;
1383 if (!next)
1384 next = name + namelen;
1385 if (next != name + 1)
1386 return -1;
1387
1388 strbuf_reset(buf);
1389 strbuf_add(buf, "HEAD", 4);
1390 return 1;
1391}
1392
71588ed2
NTND
1393static int reinterpret(struct repository *r,
1394 const char *name, int namelen, int len,
0e9f62da 1395 struct strbuf *buf, unsigned allowed)
7a0a49a7
FC
1396{
1397 /* we have extra data, which might need further processing */
1398 struct strbuf tmp = STRBUF_INIT;
1399 int used = buf->len;
1400 int ret;
1401
1402 strbuf_add(buf, name + len, namelen - len);
71588ed2 1403 ret = repo_interpret_branch_name(r, buf->buf, buf->len, &tmp, allowed);
7a0a49a7
FC
1404 /* that data was not interpreted, remove our cruft */
1405 if (ret < 0) {
1406 strbuf_setlen(buf, used);
1407 return len;
1408 }
1409 strbuf_reset(buf);
1410 strbuf_addbuf(buf, &tmp);
1411 strbuf_release(&tmp);
1412 /* tweak for size of {-N} versus expanded ref name */
1413 return ret - used + len;
1414}
1415
ea1c873c 1416static void set_shortened_ref(struct repository *r, struct strbuf *buf, const char *ref)
a39c14af 1417{
ea1c873c 1418 char *s = refs_shorten_unambiguous_ref(get_main_ref_store(r), ref, 0);
a39c14af
JK
1419 strbuf_reset(buf);
1420 strbuf_addstr(buf, s);
1421 free(s);
1422}
1423
0e9f62da
JK
1424static int branch_interpret_allowed(const char *refname, unsigned allowed)
1425{
1426 if (!allowed)
1427 return 1;
1428
1429 if ((allowed & INTERPRET_BRANCH_LOCAL) &&
1430 starts_with(refname, "refs/heads/"))
1431 return 1;
1432 if ((allowed & INTERPRET_BRANCH_REMOTE) &&
1433 starts_with(refname, "refs/remotes/"))
1434 return 1;
1435
1436 return 0;
1437}
1438
ea1c873c
NTND
1439static int interpret_branch_mark(struct repository *r,
1440 const char *name, int namelen,
48c58471
JK
1441 int at, struct strbuf *buf,
1442 int (*get_mark)(const char *, int),
1443 const char *(*get_data)(struct branch *,
0e9f62da
JK
1444 struct strbuf *),
1445 unsigned allowed)
a39c14af
JK
1446{
1447 int len;
48c58471
JK
1448 struct branch *branch;
1449 struct strbuf err = STRBUF_INIT;
1450 const char *value;
a39c14af 1451
48c58471 1452 len = get_mark(name + at, namelen - at);
a39c14af
JK
1453 if (!len)
1454 return -1;
1455
3f6eb30f
JK
1456 if (memchr(name, ':', at))
1457 return -1;
1458
48c58471
JK
1459 if (at) {
1460 char *name_str = xmemdupz(name, at);
1461 branch = branch_get(name_str);
1462 free(name_str);
1463 } else
1464 branch = branch_get(NULL);
1465
1466 value = get_data(branch, &err);
1467 if (!value)
1468 die("%s", err.buf);
1469
0e9f62da
JK
1470 if (!branch_interpret_allowed(value, allowed))
1471 return -1;
1472
ea1c873c 1473 set_shortened_ref(r, buf, value);
a39c14af
JK
1474 return len + at;
1475}
1476
8f56e9d4
NTND
1477int repo_interpret_branch_name(struct repository *r,
1478 const char *name, int namelen,
1479 struct strbuf *buf,
1480 unsigned allowed)
ae0ba8e2 1481{
f278f40f 1482 char *at;
9892d5d4 1483 const char *start;
13228c30 1484 int len;
ae0ba8e2 1485
cf99a761
FC
1486 if (!namelen)
1487 namelen = strlen(name);
1488
0e9f62da 1489 if (!allowed || (allowed & INTERPRET_BRANCH_LOCAL)) {
71588ed2 1490 len = interpret_nth_prior_checkout(r, name, namelen, buf);
0e9f62da
JK
1491 if (!len) {
1492 return len; /* syntax Ok, not enough switches */
1493 } else if (len > 0) {
1494 if (len == namelen)
1495 return len; /* consumed all */
1496 else
71588ed2 1497 return reinterpret(r, name, namelen, len, buf, allowed);
0e9f62da 1498 }
d46a8301
JK
1499 }
1500
9892d5d4
JK
1501 for (start = name;
1502 (at = memchr(start, '@', namelen - (start - name)));
1503 start = at + 1) {
9ba89f48 1504
0e9f62da
JK
1505 if (!allowed || (allowed & INTERPRET_BRANCH_HEAD)) {
1506 len = interpret_empty_at(name, namelen, at - name, buf);
1507 if (len > 0)
71588ed2 1508 return reinterpret(r, name, namelen, len, buf,
0e9f62da
JK
1509 allowed);
1510 }
9ba89f48 1511
71588ed2 1512 len = interpret_branch_mark(r, name, namelen, at - name, buf,
0e9f62da
JK
1513 upstream_mark, branch_get_upstream,
1514 allowed);
9892d5d4
JK
1515 if (len > 0)
1516 return len;
adfe5d04 1517
71588ed2 1518 len = interpret_branch_mark(r, name, namelen, at - name, buf,
0e9f62da
JK
1519 push_mark, branch_get_push,
1520 allowed);
9892d5d4
JK
1521 if (len > 0)
1522 return len;
bb0dab5d 1523 }
9ba89f48 1524
a39c14af 1525 return -1;
ae0ba8e2
JH
1526}
1527
0e9f62da 1528void strbuf_branchname(struct strbuf *sb, const char *name, unsigned allowed)
6bab74e7
JN
1529{
1530 int len = strlen(name);
0e9f62da 1531 int used = interpret_branch_name(name, len, sb, allowed);
84cf2466 1532
84cf2466
JH
1533 if (used < 0)
1534 used = 0;
1535 strbuf_add(sb, name + used, len - used);
6bab74e7
JN
1536}
1537
1538int strbuf_check_branch_ref(struct strbuf *sb, const char *name)
1539{
7c3f847a
JH
1540 if (startup_info->have_repository)
1541 strbuf_branchname(sb, name, INTERPRET_BRANCH_LOCAL);
1542 else
1543 strbuf_addstr(sb, name);
a625b092
JH
1544
1545 /*
1546 * This splice must be done even if we end up rejecting the
1547 * name; builtin/branch.c::copy_or_rename_branch() still wants
1548 * to see what the name expanded to so that "branch -m" can be
1549 * used as a tool to correct earlier mistakes.
1550 */
6bab74e7 1551 strbuf_splice(sb, 0, 0, "refs/heads/", 11);
a625b092
JH
1552
1553 if (*name == '-' ||
1554 !strcmp(sb->buf, "refs/heads/HEAD"))
1555 return -1;
1556
8d9c5010 1557 return check_refname_format(sb->buf, 0);
6bab74e7
JN
1558}
1559
9938af6a 1560/*
e82caf38 1561 * This is like "get_oid_basic()", except it allows "object ID expressions",
9938af6a
JH
1562 * notably "xyz^" for "parent of xyz"
1563 */
2764fd93 1564int get_oid(const char *name, struct object_id *oid)
1565{
e82caf38 1566 struct object_context unused;
3a7a698e 1567 return get_oid_with_context(the_repository, name, 0, oid, &unused);
2764fd93 1568}
1569
1570
cd74e473 1571/*
a8a5406a 1572 * Many callers know that the user meant to name a commit-ish by
cd74e473
JH
1573 * syntactical positions where the object name appears. Calling this
1574 * function allows the machinery to disambiguate shorter-than-unique
a8a5406a 1575 * abbreviated object names between commit-ish and others.
cd74e473
JH
1576 *
1577 * Note that this does NOT error out when the named object is not a
a8a5406a 1578 * commit-ish. It is merely to give a hint to the disambiguation
cd74e473
JH
1579 * machinery.
1580 */
e82caf38 1581int get_oid_committish(const char *name, struct object_id *oid)
cd74e473
JH
1582{
1583 struct object_context unused;
3a7a698e
NTND
1584 return get_oid_with_context(the_repository,
1585 name, GET_OID_COMMITTISH,
e82caf38 1586 oid, &unused);
cd74e473
JH
1587}
1588
e82caf38 1589int get_oid_treeish(const char *name, struct object_id *oid)
daba53ae
JH
1590{
1591 struct object_context unused;
3a7a698e
NTND
1592 return get_oid_with_context(the_repository,
1593 name, GET_OID_TREEISH,
e82caf38 1594 oid, &unused);
daba53ae
JH
1595}
1596
e82caf38 1597int get_oid_commit(const char *name, struct object_id *oid)
daba53ae
JH
1598{
1599 struct object_context unused;
3a7a698e
NTND
1600 return get_oid_with_context(the_repository,
1601 name, GET_OID_COMMIT,
e82caf38 1602 oid, &unused);
daba53ae
JH
1603}
1604
e82caf38 1605int get_oid_tree(const char *name, struct object_id *oid)
daba53ae
JH
1606{
1607 struct object_context unused;
3a7a698e
NTND
1608 return get_oid_with_context(the_repository,
1609 name, GET_OID_TREE,
e82caf38 1610 oid, &unused);
daba53ae
JH
1611}
1612
e82caf38 1613int get_oid_blob(const char *name, struct object_id *oid)
daba53ae
JH
1614{
1615 struct object_context unused;
3a7a698e
NTND
1616 return get_oid_with_context(the_repository,
1617 name, GET_OID_BLOB,
e82caf38 1618 oid, &unused);
a0cd87a5
MK
1619}
1620
009fee47 1621/* Must be called only when object_name:filename doesn't exist. */
e82caf38 1622static void diagnose_invalid_oid_path(const char *prefix,
1623 const char *filename,
1624 const struct object_id *tree_oid,
1625 const char *object_name,
1626 int object_name_len)
009fee47 1627{
e82caf38 1628 struct object_id oid;
009fee47
MM
1629 unsigned mode;
1630
1631 if (!prefix)
1632 prefix = "";
1633
dbe44faa 1634 if (file_exists(filename))
b2981d06
RS
1635 die("Path '%s' exists on disk, but not in '%.*s'.",
1636 filename, object_name_len, object_name);
c7054209 1637 if (is_missing_file_error(errno)) {
b2724c87 1638 char *fullname = xstrfmt("%s%s", prefix, filename);
009fee47 1639
916bc35b 1640 if (!get_tree_entry(tree_oid, fullname, &oid, &mode)) {
009fee47 1641 die("Path '%s' exists, but not '%s'.\n"
b2981d06 1642 "Did you mean '%.*s:%s' aka '%.*s:./%s'?",
009fee47
MM
1643 fullname,
1644 filename,
b2981d06 1645 object_name_len, object_name,
e41d718c 1646 fullname,
b2981d06 1647 object_name_len, object_name,
e41d718c 1648 filename);
009fee47 1649 }
b2981d06
RS
1650 die("Path '%s' does not exist in '%.*s'",
1651 filename, object_name_len, object_name);
009fee47
MM
1652 }
1653}
1654
1655/* Must be called only when :stage:filename doesn't exist. */
3a7a698e
NTND
1656static void diagnose_invalid_index_path(struct index_state *istate,
1657 int stage,
009fee47
MM
1658 const char *prefix,
1659 const char *filename)
1660{
9c5e6c80 1661 const struct cache_entry *ce;
009fee47
MM
1662 int pos;
1663 unsigned namelen = strlen(filename);
43bb66ae 1664 struct strbuf fullname = STRBUF_INIT;
009fee47
MM
1665
1666 if (!prefix)
1667 prefix = "";
1668
1669 /* Wrong stage number? */
3a7a698e 1670 pos = index_name_pos(istate, filename, namelen);
009fee47
MM
1671 if (pos < 0)
1672 pos = -pos - 1;
3a7a698e
NTND
1673 if (pos < istate->cache_nr) {
1674 ce = istate->cache[pos];
77e8466f
MH
1675 if (ce_namelen(ce) == namelen &&
1676 !memcmp(ce->name, filename, namelen))
1677 die("Path '%s' is in the index, but not at stage %d.\n"
1678 "Did you mean ':%d:%s'?",
1679 filename, stage,
1680 ce_stage(ce), filename);
1681 }
009fee47
MM
1682
1683 /* Confusion between relative and absolute filenames? */
43bb66ae
JK
1684 strbuf_addstr(&fullname, prefix);
1685 strbuf_addstr(&fullname, filename);
3a7a698e 1686 pos = index_name_pos(istate, fullname.buf, fullname.len);
009fee47
MM
1687 if (pos < 0)
1688 pos = -pos - 1;
3a7a698e
NTND
1689 if (pos < istate->cache_nr) {
1690 ce = istate->cache[pos];
43bb66ae
JK
1691 if (ce_namelen(ce) == fullname.len &&
1692 !memcmp(ce->name, fullname.buf, fullname.len))
77e8466f 1693 die("Path '%s' is in the index, but not '%s'.\n"
e41d718c 1694 "Did you mean ':%d:%s' aka ':%d:./%s'?",
43bb66ae
JK
1695 fullname.buf, filename,
1696 ce_stage(ce), fullname.buf,
e41d718c 1697 ce_stage(ce), filename);
77e8466f 1698 }
009fee47 1699
dbe44faa 1700 if (file_exists(filename))
009fee47 1701 die("Path '%s' exists on disk, but not in the index.", filename);
c7054209 1702 if (is_missing_file_error(errno))
009fee47
MM
1703 die("Path '%s' does not exist (neither on disk nor in the index).",
1704 filename);
1705
43bb66ae 1706 strbuf_release(&fullname);
009fee47
MM
1707}
1708
1709
979f7929
NTND
1710static char *resolve_relative_path(const char *rel)
1711{
59556548 1712 if (!starts_with(rel, "./") && !starts_with(rel, "../"))
979f7929
NTND
1713 return NULL;
1714
979f7929
NTND
1715 if (!is_inside_work_tree())
1716 die("relative path syntax can't be used outside working tree.");
1717
1718 /* die() inside prefix_path() if resolved path is outside worktree */
1719 return prefix_path(startup_info->prefix,
1720 startup_info->prefix ? strlen(startup_info->prefix) : 0,
1721 rel);
1722}
1723
7589e636 1724static enum get_oid_result get_oid_with_context_1(struct repository *repo,
3a7a698e 1725 const char *name,
e82caf38 1726 unsigned flags,
1727 const char *prefix,
1728 struct object_id *oid,
1729 struct object_context *oc)
a0cd87a5
MK
1730{
1731 int ret, bracket_depth;
73b0e5af
JH
1732 int namelen = strlen(name);
1733 const char *cp;
321c89bf 1734 int only_to_die = flags & GET_OID_ONLY_TO_DIE;
5119602a 1735
7243ffdd 1736 if (only_to_die)
321c89bf 1737 flags |= GET_OID_QUIETLY;
7243ffdd 1738
573285e5
CP
1739 memset(oc, 0, sizeof(*oc));
1740 oc->mode = S_IFINVALID;
d72cae12 1741 strbuf_init(&oc->symlink_path, 0);
e82caf38 1742 ret = get_oid_1(name, namelen, oid, flags);
73b0e5af
JH
1743 if (!ret)
1744 return ret;
33bd598c
JH
1745 /*
1746 * sha1:path --> object name of path in ent sha1
979f7929
NTND
1747 * :path -> object name of absolute path in index
1748 * :./path -> object name of path relative to cwd in index
73b0e5af 1749 * :[0-3]:path -> object name of path in index at stage
95ad6d2d 1750 * :/foo -> recent commit matching foo
73b0e5af
JH
1751 */
1752 if (name[0] == ':') {
1753 int stage = 0;
9c5e6c80 1754 const struct cache_entry *ce;
979f7929 1755 char *new_path = NULL;
73b0e5af 1756 int pos;
2e83b66c 1757 if (!only_to_die && namelen > 2 && name[1] == '/') {
84baa31b 1758 struct commit_list *list = NULL;
2b2a5be3 1759
84baa31b 1760 for_each_ref(handle_one_ref, &list);
6b3351e7 1761 head_ref(handle_one_ref, &list);
e8d1dfe6 1762 commit_list_sort_by_date(&list);
e82caf38 1763 return get_oid_oneline(name + 2, oid, list);
84baa31b 1764 }
73b0e5af
JH
1765 if (namelen < 3 ||
1766 name[2] != ':' ||
1767 name[1] < '0' || '3' < name[1])
1768 cp = name + 1;
1769 else {
1770 stage = name[1] - '0';
1771 cp = name + 3;
5119602a 1772 }
3d6e0f74
JH
1773 new_path = resolve_relative_path(cp);
1774 if (!new_path) {
1775 namelen = namelen - (cp - name);
1776 } else {
1777 cp = new_path;
1778 namelen = strlen(cp);
1779 }
573285e5 1780
321c89bf 1781 if (flags & GET_OID_RECORD_PATH)
dc944b65 1782 oc->path = xstrdup(cp);
573285e5 1783
3a7a698e 1784 if (!repo->index->cache)
e1ff0a32 1785 repo_read_index(the_repository);
3a7a698e 1786 pos = index_name_pos(repo->index, cp, namelen);
73b0e5af
JH
1787 if (pos < 0)
1788 pos = -pos - 1;
3a7a698e
NTND
1789 while (pos < repo->index->cache_nr) {
1790 ce = repo->index->cache[pos];
73b0e5af
JH
1791 if (ce_namelen(ce) != namelen ||
1792 memcmp(ce->name, cp, namelen))
1793 break;
1794 if (ce_stage(ce) == stage) {
e82caf38 1795 oidcpy(oid, &ce->oid);
90064710 1796 oc->mode = ce->ce_mode;
979f7929 1797 free(new_path);
73b0e5af
JH
1798 return 0;
1799 }
e7cef45f 1800 pos++;
73b0e5af 1801 }
2e83b66c 1802 if (only_to_die && name[1] && name[1] != '/')
3a7a698e 1803 diagnose_invalid_index_path(repo->index, stage, prefix, cp);
979f7929 1804 free(new_path);
73b0e5af
JH
1805 return -1;
1806 }
cce91a2c
SP
1807 for (cp = name, bracket_depth = 0; *cp; cp++) {
1808 if (*cp == '{')
1809 bracket_depth++;
1810 else if (bracket_depth && *cp == '}')
1811 bracket_depth--;
1812 else if (!bracket_depth && *cp == ':')
1813 break;
1814 }
1815 if (*cp == ':') {
e82caf38 1816 struct object_id tree_oid;
b2981d06 1817 int len = cp - name;
8a10fea4
JK
1818 unsigned sub_flags = flags;
1819
321c89bf 1820 sub_flags &= ~GET_OID_DISAMBIGUATORS;
1821 sub_flags |= GET_OID_TREEISH;
8a10fea4 1822
e82caf38 1823 if (!get_oid_1(name, len, &tree_oid, sub_flags)) {
009fee47 1824 const char *filename = cp+1;
979f7929
NTND
1825 char *new_filename = NULL;
1826
1827 new_filename = resolve_relative_path(filename);
1828 if (new_filename)
1829 filename = new_filename;
321c89bf 1830 if (flags & GET_OID_FOLLOW_SYMLINKS) {
3b683bcf 1831 ret = get_tree_entry_follow_symlinks(&tree_oid,
1832 filename, oid, &oc->symlink_path,
c4ec9677
DT
1833 &oc->mode);
1834 } else {
916bc35b 1835 ret = get_tree_entry(&tree_oid, filename, oid,
1836 &oc->mode);
c4ec9677 1837 if (ret && only_to_die) {
e82caf38 1838 diagnose_invalid_oid_path(prefix,
c4ec9677 1839 filename,
e82caf38 1840 &tree_oid,
c4ec9677
DT
1841 name, len);
1842 }
009fee47 1843 }
321c89bf 1844 if (flags & GET_OID_RECORD_PATH)
dc944b65 1845 oc->path = xstrdup(filename);
573285e5 1846
979f7929 1847 free(new_filename);
009fee47
MM
1848 return ret;
1849 } else {
2e83b66c 1850 if (only_to_die)
b2981d06 1851 die("Invalid object name '%.*s'.", len, name);
009fee47 1852 }
5119602a
LT
1853 }
1854 return ret;
9938af6a 1855}
f01cc14c 1856
8c135ea2
JH
1857/*
1858 * Call this function when you know "name" given by the end user must
1859 * name an object but it doesn't; the function _may_ die with a better
1860 * diagnostic message than "no such object 'name'", e.g. "Path 'doc' does not
1861 * exist in 'HEAD'" when given "HEAD:doc", or it may return in which case
1862 * you have a chance to diagnose the error further.
1863 */
1864void maybe_die_on_misspelt_object_name(const char *name, const char *prefix)
f01cc14c
JH
1865{
1866 struct object_context oc;
e82caf38 1867 struct object_id oid;
3a7a698e
NTND
1868 get_oid_with_context_1(the_repository, name, GET_OID_ONLY_TO_DIE,
1869 prefix, &oid, &oc);
8c135ea2
JH
1870}
1871
127b48f9
NTND
1872enum get_oid_result get_oid_with_context(struct repository *repo,
1873 const char *str,
1874 unsigned flags,
1875 struct object_id *oid,
1876 struct object_context *oc)
f01cc14c 1877{
321c89bf 1878 if (flags & GET_OID_FOLLOW_SYMLINKS && flags & GET_OID_ONLY_TO_DIE)
033abf97 1879 BUG("incompatible flags for get_sha1_with_context");
3a7a698e 1880 return get_oid_with_context_1(repo, str, flags, NULL, oid, oc);
f01cc14c 1881}