1#include "cache.h"
2#include "tag.h"
3#include "commit.h"
4#include "tree.h"
5#include "blob.h"
6#include "tree-walk.h"
7#include "refs.h"
8static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
10{
11 struct alternate_object_database *alt;
12 char hex[40];
13 int found = 0;
14 static struct alternate_object_database *fakeent;
15 if (!fakeent) {
17 const char *objdir = get_object_directory();
18 int objdir_len = strlen(objdir);
19 int entlen = objdir_len + 43;
20 fakeent = xmalloc(sizeof(*fakeent) + entlen);
21 memcpy(fakeent->base, objdir, objdir_len);
22 fakeent->name = fakeent->base + objdir_len + 1;
23 fakeent->name[-1] = '/';
24 }
25 fakeent->next = alt_odb_list;
26 sprintf(hex, "%.2s", name);
28 for (alt = fakeent; alt && found < 2; alt = alt->next) {
29 struct dirent *de;
30 DIR *dir;
31 sprintf(alt->name, "%.2s/", name);
32 dir = opendir(alt->base);
33 if (!dir)
34 continue;
35 while ((de = readdir(dir)) != NULL) {
36 if (strlen(de->d_name) != 38)
37 continue;
38 if (memcmp(de->d_name, name + 2, len - 2))
39 continue;
40 if (!found) {
41 memcpy(hex + 2, de->d_name, 38);
42 found++;
43 }
44 else if (memcmp(hex + 2, de->d_name, 38)) {
45 found = 2;
46 break;
47 }
48 }
49 closedir(dir);
50 }
51 if (found == 1)
52 return get_sha1_hex(hex, sha1) == 0;
53 return found;
54}
55static int match_sha(unsigned len, const unsigned char *a, const unsigned char *b)
57{
58 do {
59 if (*a != *b)
60 return 0;
61 a++;
62 b++;
63 len -= 2;
64 } while (len > 1);
65 if (len)
66 if ((*a ^ *b) & 0xf0)
67 return 0;
68 return 1;
69}
70static int find_short_packed_object(int len, const unsigned char *match, unsigned char *sha1)
72{
73 struct packed_git *p;
74 const unsigned char *found_sha1 = NULL;
75 int found = 0;
76 prepare_packed_git();
78 for (p = packed_git; p && found < 2; p = p->next) {
79 uint32_t num, last;
80 uint32_t first = 0;
81 open_pack_index(p);
82 num = p->num_objects;
83 last = num;
84 while (first < last) {
85 uint32_t mid = (first + last) / 2;
86 const unsigned char *now;
87 int cmp;
88 now = nth_packed_object_sha1(p, mid);
90 cmp = hashcmp(match, now);
91 if (!cmp) {
92 first = mid;
93 break;
94 }
95 if (cmp > 0) {
96 first = mid+1;
97 continue;
98 }
99 last = mid;
100 }
101 if (first < num) {
102 const unsigned char *now, *next;
103 now = nth_packed_object_sha1(p, first);
104 if (match_sha(len, match, now)) {
105 next = nth_packed_object_sha1(p, first+1);
106 if (!next|| !match_sha(len, match, next)) {
107 /* unique within this pack */
108 if (!found) {
109 found_sha1 = now;
110 found++;
111 }
112 else if (hashcmp(found_sha1, now)) {
113 found = 2;
114 break;
115 }
116 }
117 else {
118 /* not even unique within this pack */
119 found = 2;
120 break;
121 }
122 }
123 }
124 }
125 if (found == 1)
126 hashcpy(sha1, found_sha1);
127 return found;
128}
129#define SHORT_NAME_NOT_FOUND (-1)
131#define SHORT_NAME_AMBIGUOUS (-2)
132static int find_unique_short_object(int len, char *canonical,
134 unsigned char *res, unsigned char *sha1)
135{
136 int has_unpacked, has_packed;
137 unsigned char unpacked_sha1[20], packed_sha1[20];
138 prepare_alt_odb();
140 has_unpacked = find_short_object_filename(len, canonical, unpacked_sha1);
141 has_packed = find_short_packed_object(len, res, packed_sha1);
142 if (!has_unpacked && !has_packed)
143 return SHORT_NAME_NOT_FOUND;
144 if (1 < has_unpacked || 1 < has_packed)
145 return SHORT_NAME_AMBIGUOUS;
146 if (has_unpacked != has_packed) {
147 hashcpy(sha1, (has_packed ? packed_sha1 : unpacked_sha1));
148 return 0;
149 }
150 /* Both have unique ones -- do they match? */
151 if (hashcmp(packed_sha1, unpacked_sha1))
152 return SHORT_NAME_AMBIGUOUS;
153 hashcpy(sha1, packed_sha1);
154 return 0;
155}
156static int get_short_sha1(const char *name, int len, unsigned char *sha1,
158 int quietly)
159{
160 int i, status;
161 char canonical[40];
162 unsigned char res[20];
163 if (len < MINIMUM_ABBREV || len > 40)
165 return -1;
166 hashclr(res);
167 memset(canonical, 'x', 40);
168 for (i = 0; i < len ;i++) {
169 unsigned char c = name[i];
170 unsigned char val;
171 if (c >= '0' && c <= '9')
172 val = c - '0';
173 else if (c >= 'a' && c <= 'f')
174 val = c - 'a' + 10;
175 else if (c >= 'A' && c <='F') {
176 val = c - 'A' + 10;
177 c -= 'A' - 'a';
178 }
179 else
180 return -1;
181 canonical[i] = c;
182 if (!(i & 1))
183 val <<= 4;
184 res[i >> 1] |= val;
185 }
186 status = find_unique_short_object(i, canonical, res, sha1);
188 if (!quietly && (status == SHORT_NAME_AMBIGUOUS))
189 return error("short SHA1 %.*s is ambiguous.", len, canonical);
190 return status;
191}
192const char *find_unique_abbrev(const unsigned char *sha1, int len)
194{
195 int status, exists;
196 static char hex[41];
197 exists = has_sha1_file(sha1);
199 memcpy(hex, sha1_to_hex(sha1), 40);
200 if (len == 40 || !len)
201 return hex;
202 while (len < 40) {
203 unsigned char sha1_ret[20];
204 status = get_short_sha1(hex, len, sha1_ret, 1);
205 if (exists
206 ? !status
207 : status == SHORT_NAME_NOT_FOUND) {
208 hex[len] = 0;
209 return hex;
210 }
211 len++;
212 }
213 return hex;
214}
215static int ambiguous_path(const char *path, int len)
217{
218 int slash = 1;
219 int cnt;
220 for (cnt = 0; cnt < len; cnt++) {
222 switch (*path++) {
223 case '\0':
224 break;
225 case '/':
226 if (slash)
227 break;
228 slash = 1;
229 continue;
230 case '.':
231 continue;
232 default:
233 slash = 0;
234 continue;
235 }
236 break;
237 }
238 return slash;
239}
240/*
242 * *string and *len will only be substituted, and *string returned (for
243 * later free()ing) if the string passed in is of the form @{-<n>}.
244 */
245static char *substitute_branch_name(const char **string, int *len)
246{
247 struct strbuf buf = STRBUF_INIT;
248 int ret = interpret_branch_name(*string, &buf);
249 if (ret == *len) {
251 size_t size;
252 *string = strbuf_detach(&buf, &size);
253 *len = size;
254 return (char *)*string;
255 }
256 return NULL;
258}
259int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
261{
262 char *last_branch = substitute_branch_name(&str, &len);
263 const char **p, *r;
264 int refs_found = 0;
265 *ref = NULL;
267 for (p = ref_rev_parse_rules; *p; p++) {
268 char fullref[PATH_MAX];
269 unsigned char sha1_from_ref[20];
270 unsigned char *this_result;
271 int flag;
272 this_result = refs_found ? sha1_from_ref : sha1;
274 mksnpath(fullref, sizeof(fullref), *p, len, str);
275 r = resolve_ref(fullref, this_result, 1, &flag);
276 if (r) {
277 if (!refs_found++)
278 *ref = xstrdup(r);
279 if (!warn_ambiguous_refs)
280 break;
281 } else if ((flag & REF_ISSYMREF) &&
282 (len != 4 || strcmp(str, "HEAD")))
283 warning("ignoring dangling symref %s.", fullref);
284 }
285 free(last_branch);
286 return refs_found;
287}
288int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
290{
291 char *last_branch = substitute_branch_name(&str, &len);
292 const char **p;
293 int logs_found = 0;
294 *log = NULL;
296 for (p = ref_rev_parse_rules; *p; p++) {
297 struct stat st;
298 unsigned char hash[20];
299 char path[PATH_MAX];
300 const char *ref, *it;
301 mksnpath(path, sizeof(path), *p, len, str);
303 ref = resolve_ref(path, hash, 1, NULL);
304 if (!ref)
305 continue;
306 if (!stat(git_path("logs/%s", path), &st) &&
307 S_ISREG(st.st_mode))
308 it = path;
309 else if (strcmp(ref, path) &&
310 !stat(git_path("logs/%s", ref), &st) &&
311 S_ISREG(st.st_mode))
312 it = ref;
313 else
314 continue;
315 if (!logs_found++) {
316 *log = xstrdup(it);
317 hashcpy(sha1, hash);
318 }
319 if (!warn_ambiguous_refs)
320 break;
321 }
322 free(last_branch);
323 return logs_found;
324}
325static int get_sha1_1(const char *name, int len, unsigned char *sha1);
327static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
329{
330 static const char *warning = "warning: refname '%.*s' is ambiguous.\n";
331 char *real_ref = NULL;
332 int refs_found = 0;
333 int at, reflog_len;
334 if (len == 40 && !get_sha1_hex(str, sha1))
336 return 0;
337 /* basic@{time or number or -number} format to query ref-log */
339 reflog_len = at = 0;
340 if (len && str[len-1] == '}') {
341 for (at = len-2; at >= 0; at--) {
342 if (str[at] == '@' && str[at+1] == '{') {
343 reflog_len = (len-1) - (at+2);
344 len = at;
345 break;
346 }
347 }
348 }
349 /* Accept only unambiguous ref paths. */
351 if (len && ambiguous_path(str, len))
352 return -1;
353 if (!len && reflog_len) {
355 struct strbuf buf = STRBUF_INIT;
356 int ret;
357 /* try the @{-N} syntax for n-th checkout */
358 ret = interpret_branch_name(str+at, &buf);
359 if (ret > 0) {
360 /* substitute this branch name and restart */
361 return get_sha1_1(buf.buf, buf.len, sha1);
362 } else if (ret == 0) {
363 return -1;
364 }
365 /* allow "@{...}" to mean the current branch reflog */
366 refs_found = dwim_ref("HEAD", 4, sha1, &real_ref);
367 } else if (reflog_len)
368 refs_found = dwim_log(str, len, sha1, &real_ref);
369 else
370 refs_found = dwim_ref(str, len, sha1, &real_ref);
371 if (!refs_found)
373 return -1;
374 if (warn_ambiguous_refs && refs_found > 1)
376 fprintf(stderr, warning, len, str);
377 if (reflog_len) {
379 int nth, i;
380 unsigned long at_time;
381 unsigned long co_time;
382 int co_tz, co_cnt;
383 /* Is it asking for N-th entry, or approxidate? */
385 for (i = nth = 0; 0 <= nth && i < reflog_len; i++) {
386 char ch = str[at+2+i];
387 if ('0' <= ch && ch <= '9')
388 nth = nth * 10 + ch - '0';
389 else
390 nth = -1;
391 }
392 if (100000000 <= nth) {
393 at_time = nth;
394 nth = -1;
395 } else if (0 <= nth)
396 at_time = 0;
397 else {
398 char *tmp = xstrndup(str + at + 2, reflog_len);
399 at_time = approxidate(tmp);
400 free(tmp);
401 }
402 if (read_ref_at(real_ref, at_time, nth, sha1, NULL,
403 &co_time, &co_tz, &co_cnt)) {
404 if (at_time)
405 fprintf(stderr,
406 "warning: Log for '%.*s' only goes "
407 "back to %s.\n", len, str,
408 show_date(co_time, co_tz, DATE_RFC2822));
409 else
410 fprintf(stderr,
411 "warning: Log for '%.*s' only has "
412 "%d entries.\n", len, str, co_cnt);
413 }
414 }
415 free(real_ref);
417 return 0;
418}
419static int get_parent(const char *name, int len,
421 unsigned char *result, int idx)
422{
423 unsigned char sha1[20];
424 int ret = get_sha1_1(name, len, sha1);
425 struct commit *commit;
426 struct commit_list *p;
427 if (ret)
429 return ret;
430 commit = lookup_commit_reference(sha1);
431 if (!commit)
432 return -1;
433 if (parse_commit(commit))
434 return -1;
435 if (!idx) {
436 hashcpy(result, commit->object.sha1);
437 return 0;
438 }
439 p = commit->parents;
440 while (p) {
441 if (!--idx) {
442 hashcpy(result, p->item->object.sha1);
443 return 0;
444 }
445 p = p->next;
446 }
447 return -1;
448}
449static int get_nth_ancestor(const char *name, int len,
451 unsigned char *result, int generation)
452{
453 unsigned char sha1[20];
454 struct commit *commit;
455 int ret;
456 ret = get_sha1_1(name, len, sha1);
458 if (ret)
459 return ret;
460 commit = lookup_commit_reference(sha1);
461 if (!commit)
462 return -1;
463 while (generation--) {
465 if (parse_commit(commit) || !commit->parents)
466 return -1;
467 commit = commit->parents->item;
468 }
469 hashcpy(result, commit->object.sha1);
470 return 0;
471}
472struct object *peel_to_type(const char *name, int namelen,
474 struct object *o, enum object_type expected_type)
475{
476 if (name && !namelen)
477 namelen = strlen(name);
478 if (!o) {
479 unsigned char sha1[20];
480 if (get_sha1_1(name, namelen, sha1))
481 return NULL;
482 o = parse_object(sha1);
483 }
484 while (1) {
485 if (!o || (!o->parsed && !parse_object(o->sha1)))
486 return NULL;
487 if (o->type == expected_type)
488 return o;
489 if (o->type == OBJ_TAG)
490 o = ((struct tag*) o)->tagged;
491 else if (o->type == OBJ_COMMIT)
492 o = &(((struct commit *) o)->tree->object);
493 else {
494 if (name)
495 error("%.*s: expected %s type, but the object "
496 "dereferences to %s type",
497 namelen, name, typename(expected_type),
498 typename(o->type));
499 return NULL;
500 }
501 }
502}
503static int peel_onion(const char *name, int len, unsigned char *sha1)
505{
506 unsigned char outer[20];
507 const char *sp;
508 unsigned int expected_type = 0;
509 struct object *o;
510 /*
512 * "ref^{type}" dereferences ref repeatedly until you cannot
513 * dereference anymore, or you get an object of given type,
514 * whichever comes first. "ref^{}" means just dereference
515 * tags until you get a non-tag. "ref^0" is a shorthand for
516 * "ref^{commit}". "commit^{tree}" could be used to find the
517 * top-level tree of the given commit.
518 */
519 if (len < 4 || name[len-1] != '}')
520 return -1;
521 for (sp = name + len - 1; name <= sp; sp--) {
523 int ch = *sp;
524 if (ch == '{' && name < sp && sp[-1] == '^')
525 break;
526 }
527 if (sp <= name)
528 return -1;
529 sp++; /* beginning of type name, or closing brace for empty */
531 if (!strncmp(commit_type, sp, 6) && sp[6] == '}')
532 expected_type = OBJ_COMMIT;
533 else if (!strncmp(tree_type, sp, 4) && sp[4] == '}')
534 expected_type = OBJ_TREE;
535 else if (!strncmp(blob_type, sp, 4) && sp[4] == '}')
536 expected_type = OBJ_BLOB;
537 else if (sp[0] == '}')
538 expected_type = OBJ_NONE;
539 else
540 return -1;
541 if (get_sha1_1(name, sp - name - 2, outer))
543 return -1;
544 o = parse_object(outer);
546 if (!o)
547 return -1;
548 if (!expected_type) {
549 o = deref_tag(o, name, sp - name - 2);
550 if (!o || (!o->parsed && !parse_object(o->sha1)))
551 return -1;
552 hashcpy(sha1, o->sha1);
553 }
554 else {
555 /*
556 * At this point, the syntax look correct, so
557 * if we do not get the needed object, we should
558 * barf.
559 */
560 o = peel_to_type(name, len, o, expected_type);
561 if (o) {
562 hashcpy(sha1, o->sha1);
563 return 0;
564 }
565 return -1;
566 }
567 return 0;
568}
569static int get_describe_name(const char *name, int len, unsigned char *sha1)
571{
572 const char *cp;
573 for (cp = name + len - 1; name + 2 <= cp; cp--) {
575 char ch = *cp;
576 if (hexval(ch) & ~0377) {
577 /* We must be looking at g in "SOMETHING-g"
578 * for it to be describe output.
579 */
580 if (ch == 'g' && cp[-1] == '-') {
581 cp++;
582 len -= cp - name;
583 return get_short_sha1(cp, len, sha1, 1);
584 }
585 }
586 }
587 return -1;
588}
589static int get_sha1_1(const char *name, int len, unsigned char *sha1)
591{
592 int ret, has_suffix;
593 const char *cp;
594 /*
596 * "name~3" is "name^^^", "name~" is "name~1", and "name^" is "name^1".
597 */
598 has_suffix = 0;
599 for (cp = name + len - 1; name <= cp; cp--) {
600 int ch = *cp;
601 if ('0' <= ch && ch <= '9')
602 continue;
603 if (ch == '~' || ch == '^')
604 has_suffix = ch;
605 break;
606 }
607 if (has_suffix) {
609 int num = 0;
610 int len1 = cp - name;
611 cp++;
612 while (cp < name + len)
613 num = num * 10 + *cp++ - '0';
614 if (!num && len1 == len - 1)
615 num = 1;
616 if (has_suffix == '^')
617 return get_parent(name, len1, sha1, num);
618 /* else if (has_suffix == '~') -- goes without saying */
619 return get_nth_ancestor(name, len1, sha1, num);
620 }
621 ret = peel_onion(name, len, sha1);
623 if (!ret)
624 return 0;
625 ret = get_sha1_basic(name, len, sha1);
627 if (!ret)
628 return 0;
629 /* It could be describe output that is "SOMETHING-gXXXX" */
631 ret = get_describe_name(name, len, sha1);
632 if (!ret)
633 return 0;
634 return get_short_sha1(name, len, sha1, 0);
636}
637static int handle_one_ref(const char *path,
639 const unsigned char *sha1, int flag, void *cb_data)
640{
641 struct commit_list **list = cb_data;
642 struct object *object = parse_object(sha1);
643 if (!object)
644 return 0;
645 if (object->type == OBJ_TAG) {
646 object = deref_tag(object, path, strlen(path));
647 if (!object)
648 return 0;
649 }
650 if (object->type != OBJ_COMMIT)
651 return 0;
652 insert_by_date((struct commit *)object, list);
653 return 0;
654}
655/*
657 * This interprets names like ':/Initial revision of "git"' by searching
658 * through history and returning the first commit whose message starts
659 * with the given string.
660 *
661 * For future extension, ':/!' is reserved. If you want to match a message
662 * beginning with a '!', you have to repeat the exclamation mark.
663 */
664#define ONELINE_SEEN (1u<<20)
666static int get_sha1_oneline(const char *prefix, unsigned char *sha1)
667{
668 struct commit_list *list = NULL, *backup = NULL, *l;
669 int retval = -1;
670 char *temp_commit_buffer = NULL;
671 if (prefix[0] == '!') {
673 if (prefix[1] != '!')
674 die ("Invalid search pattern: %s", prefix);
675 prefix++;
676 }
677 for_each_ref(handle_one_ref, &list);
678 for (l = list; l; l = l->next)
679 commit_list_insert(l->item, &backup);
680 while (list) {
681 char *p;
682 struct commit *commit;
683 enum object_type type;
684 unsigned long size;
685 commit = pop_most_recent_commit(&list, ONELINE_SEEN);
687 if (!parse_object(commit->object.sha1))
688 continue;
689 free(temp_commit_buffer);
690 if (commit->buffer)
691 p = commit->buffer;
692 else {
693 p = read_sha1_file(commit->object.sha1, &type, &size);
694 if (!p)
695 continue;
696 temp_commit_buffer = p;
697 }
698 if (!(p = strstr(p, "\n\n")))
699 continue;
700 if (!prefixcmp(p + 2, prefix)) {
701 hashcpy(sha1, commit->object.sha1);
702 retval = 0;
703 break;
704 }
705 }
706 free(temp_commit_buffer);
707 free_commit_list(list);
708 for (l = backup; l; l = l->next)
709 clear_commit_marks(l->item, ONELINE_SEEN);
710 return retval;
711}
712struct grab_nth_branch_switch_cbdata {
714 long cnt, alloc;
715 struct strbuf *buf;
716};
717static int grab_nth_branch_switch(unsigned char *osha1, unsigned char *nsha1,
719 const char *email, unsigned long timestamp, int tz,
720 const char *message, void *cb_data)
721{
722 struct grab_nth_branch_switch_cbdata *cb = cb_data;
723 const char *match = NULL, *target = NULL;
724 size_t len;
725 int nth;
726 if (!prefixcmp(message, "checkout: moving from ")) {
728 match = message + strlen("checkout: moving from ");
729 target = strstr(match, " to ");
730 }
731 if (!match || !target)
733 return 0;
734 len = target - match;
736 nth = cb->cnt++ % cb->alloc;
737 strbuf_reset(&cb->buf[nth]);
738 strbuf_add(&cb->buf[nth], match, len);
739 return 0;
740}
741/*
743 * This reads "@{-N}" syntax, finds the name of the Nth previous
744 * branch we were on, and places the name of the branch in the given
745 * buf and returns the number of characters parsed if successful.
746 *
747 * If the input is not of the accepted format, it returns a negative
748 * number to signal an error.
749 *
750 * If the input was ok but there are not N branch switches in the
751 * reflog, it returns 0.
752 */
753int interpret_branch_name(const char *name, struct strbuf *buf)
754{
755 long nth;
756 int i, retval;
757 struct grab_nth_branch_switch_cbdata cb;
758 const char *brace;
759 char *num_end;
760 if (name[0] != '@' || name[1] != '{' || name[2] != '-')
762 return -1;
763 brace = strchr(name, '}');
764 if (!brace)
765 return -1;
766 nth = strtol(name+3, &num_end, 10);
767 if (num_end != brace)
768 return -1;
769 if (nth <= 0)
770 return -1;
771 cb.alloc = nth;
772 cb.buf = xmalloc(nth * sizeof(struct strbuf));
773 for (i = 0; i < nth; i++)
774 strbuf_init(&cb.buf[i], 20);
775 cb.cnt = 0;
776 retval = 0;
777 for_each_recent_reflog_ent("HEAD", grab_nth_branch_switch, 40960, &cb);
778 if (cb.cnt < nth) {
779 cb.cnt = 0;
780 for_each_reflog_ent("HEAD", grab_nth_branch_switch, &cb);
781 }
782 if (cb.cnt < nth)
783 goto release_return;
784 i = cb.cnt % nth;
785 strbuf_reset(buf);
786 strbuf_add(buf, cb.buf[i].buf, cb.buf[i].len);
787 retval = brace-name+1;
788release_return:
790 for (i = 0; i < nth; i++)
791 strbuf_release(&cb.buf[i]);
792 free(cb.buf);
793 return retval;
795}
796int get_sha1_mb(const char *name, unsigned char *sha1)
798{
799 struct commit *one, *two;
800 struct commit_list *mbs;
801 unsigned char sha1_tmp[20];
802 const char *dots;
803 int st;
804 dots = strstr(name, "...");
806 if (!dots)
807 return get_sha1(name, sha1);
808 if (dots == name)
809 st = get_sha1("HEAD", sha1_tmp);
810 else {
811 struct strbuf sb;
812 strbuf_init(&sb, dots - name);
813 strbuf_add(&sb, name, dots - name);
814 st = get_sha1(sb.buf, sha1_tmp);
815 strbuf_release(&sb);
816 }
817 if (st)
818 return st;
819 one = lookup_commit_reference_gently(sha1_tmp, 0);
820 if (!one)
821 return -1;
822 if (get_sha1(dots[3] ? (dots + 3) : "HEAD", sha1_tmp))
824 return -1;
825 two = lookup_commit_reference_gently(sha1_tmp, 0);
826 if (!two)
827 return -1;
828 mbs = get_merge_bases(one, two, 1);
829 if (!mbs || mbs->next)
830 st = -1;
831 else {
832 st = 0;
833 hashcpy(sha1, mbs->item->object.sha1);
834 }
835 free_commit_list(mbs);
836 return st;
837}
838/*
840 * This is like "get_sha1_basic()", except it allows "sha1 expressions",
841 * notably "xyz^" for "parent of xyz"
842 */
843int get_sha1(const char *name, unsigned char *sha1)
844{
845 unsigned unused;
846 return get_sha1_with_mode(name, sha1, &unused);
847}
848/* Must be called only when object_name:filename doesn't exist. */
850static void diagnose_invalid_sha1_path(const char *prefix,
851 const char *filename,
852 const unsigned char *tree_sha1,
853 const char *object_name)
854{
855 struct stat st;
856 unsigned char sha1[20];
857 unsigned mode;
858 if (!prefix)
860 prefix = "";
861 if (!lstat(filename, &st))
863 die("Path '%s' exists on disk, but not in '%s'.",
864 filename, object_name);
865 if (errno == ENOENT || errno == ENOTDIR) {
866 char *fullname = xmalloc(strlen(filename)
867 + strlen(prefix) + 1);
868 strcpy(fullname, prefix);
869 strcat(fullname, filename);
870 if (!get_tree_entry(tree_sha1, fullname,
872 sha1, &mode)) {
873 die("Path '%s' exists, but not '%s'.\n"
874 "Did you mean '%s:%s'?",
875 fullname,
876 filename,
877 object_name,
878 fullname);
879 }
880 die("Path '%s' does not exist in '%s'",
881 filename, object_name);
882 }
883}
884/* Must be called only when :stage:filename doesn't exist. */
886static void diagnose_invalid_index_path(int stage,
887 const char *prefix,
888 const char *filename)
889{
890 struct stat st;
891 struct cache_entry *ce;
892 int pos;
893 unsigned namelen = strlen(filename);
894 unsigned fullnamelen;
895 char *fullname;
896 if (!prefix)
898 prefix = "";
899 /* Wrong stage number? */
901 pos = cache_name_pos(filename, namelen);
902 if (pos < 0)
903 pos = -pos - 1;
904 ce = active_cache[pos];
905 if (ce_namelen(ce) == namelen &&
906 !memcmp(ce->name, filename, namelen))
907 die("Path '%s' is in the index, but not at stage %d.\n"
908 "Did you mean ':%d:%s'?",
909 filename, stage,
910 ce_stage(ce), filename);
911 /* Confusion between relative and absolute filenames? */
913 fullnamelen = namelen + strlen(prefix);
914 fullname = xmalloc(fullnamelen + 1);
915 strcpy(fullname, prefix);
916 strcat(fullname, filename);
917 pos = cache_name_pos(fullname, fullnamelen);
918 if (pos < 0)
919 pos = -pos - 1;
920 ce = active_cache[pos];
921 if (ce_namelen(ce) == fullnamelen &&
922 !memcmp(ce->name, fullname, fullnamelen))
923 die("Path '%s' is in the index, but not '%s'.\n"
924 "Did you mean ':%d:%s'?",
925 fullname, filename,
926 ce_stage(ce), fullname);
927 if (!lstat(filename, &st))
929 die("Path '%s' exists on disk, but not in the index.", filename);
930 if (errno == ENOENT || errno == ENOTDIR)
931 die("Path '%s' does not exist (neither on disk nor in the index).",
932 filename);
933 free(fullname);
935}
936int get_sha1_with_mode_1(const char *name, unsigned char *sha1, unsigned *mode, int gently, const char *prefix)
939{
940 int ret, bracket_depth;
941 int namelen = strlen(name);
942 const char *cp;
943 *mode = S_IFINVALID;
945 ret = get_sha1_1(name, namelen, sha1);
946 if (!ret)
947 return ret;
948 /* sha1:path --> object name of path in ent sha1
949 * :path -> object name of path in index
950 * :[0-3]:path -> object name of path in index at stage
951 */
952 if (name[0] == ':') {
953 int stage = 0;
954 struct cache_entry *ce;
955 int pos;
956 if (namelen > 2 && name[1] == '/')
957 return get_sha1_oneline(name + 2, sha1);
958 if (namelen < 3 ||
959 name[2] != ':' ||
960 name[1] < '0' || '3' < name[1])
961 cp = name + 1;
962 else {
963 stage = name[1] - '0';
964 cp = name + 3;
965 }
966 namelen = namelen - (cp - name);
967 if (!active_cache)
968 read_cache();
969 pos = cache_name_pos(cp, namelen);
970 if (pos < 0)
971 pos = -pos - 1;
972 while (pos < active_nr) {
973 ce = active_cache[pos];
974 if (ce_namelen(ce) != namelen ||
975 memcmp(ce->name, cp, namelen))
976 break;
977 if (ce_stage(ce) == stage) {
978 hashcpy(sha1, ce->sha1);
979 *mode = ce->ce_mode;
980 return 0;
981 }
982 pos++;
983 }
984 if (!gently)
985 diagnose_invalid_index_path(stage, prefix, cp);
986 return -1;
987 }
988 for (cp = name, bracket_depth = 0; *cp; cp++) {
989 if (*cp == '{')
990 bracket_depth++;
991 else if (bracket_depth && *cp == '}')
992 bracket_depth--;
993 else if (!bracket_depth && *cp == ':')
994 break;
995 }
996 if (*cp == ':') {
997 unsigned char tree_sha1[20];
998 char *object_name = NULL;
999 if (!gently) {
1000 object_name = xmalloc(cp-name+1);
1001 strncpy(object_name, name, cp-name);
1002 object_name[cp-name] = '\0';
1003 }
1004 if (!get_sha1_1(name, cp-name, tree_sha1)) {
1005 const char *filename = cp+1;
1006 ret = get_tree_entry(tree_sha1, filename, sha1, mode);
1007 if (!gently) {
1008 diagnose_invalid_sha1_path(prefix, filename,
1009 tree_sha1, object_name);
1010 free(object_name);
1011 }
1012 return ret;
1013 } else {
1014 if (!gently)
1015 die("Invalid object name '%s'.", object_name);
1016 }
1017 }
1018 return ret;
1019}