9 static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
11 struct alternate_object_database *alt;
14 static struct alternate_object_database *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] = '/';
25 fakeent->next = alt_odb_list;
27 sprintf(hex, "%.2s", name);
28 for (alt = fakeent; alt && found < 2; alt = alt->next) {
31 sprintf(alt->name, "%.2s/", name);
32 dir = opendir(alt->base);
35 while ((de = readdir(dir)) != NULL) {
36 if (strlen(de->d_name) != 38)
38 if (memcmp(de->d_name, name + 2, len - 2))
41 memcpy(hex + 2, de->d_name, 38);
44 else if (memcmp(hex + 2, de->d_name, 38)) {
52 return get_sha1_hex(hex, sha1) == 0;
56 static int match_sha(unsigned len, const unsigned char *a, const unsigned char *b)
71 static int find_short_packed_object(int len, const unsigned char *match, unsigned char *sha1)
74 unsigned char found_sha1[20];
78 for (p = packed_git; p && found < 2; p = p->next) {
79 unsigned num = num_packed_objects(p);
80 unsigned first = 0, last = num;
81 while (first < last) {
82 unsigned mid = (first + last) / 2;
83 unsigned char now[20];
86 nth_packed_object_sha1(p, mid, now);
87 cmp = memcmp(match, now, 20);
99 unsigned char now[20], next[20];
100 nth_packed_object_sha1(p, first, now);
101 if (match_sha(len, match, now)) {
102 if (nth_packed_object_sha1(p, first+1, next) ||
103 !match_sha(len, match, next)) {
104 /* unique within this pack */
106 memcpy(found_sha1, now, 20);
109 else if (memcmp(found_sha1, now, 20)) {
115 /* not even unique within this pack */
123 memcpy(sha1, found_sha1, 20);
127 #define SHORT_NAME_NOT_FOUND (-1)
128 #define SHORT_NAME_AMBIGUOUS (-2)
130 static int find_unique_short_object(int len, char *canonical,
131 unsigned char *res, unsigned char *sha1)
133 int has_unpacked, has_packed;
134 unsigned char unpacked_sha1[20], packed_sha1[20];
136 has_unpacked = find_short_object_filename(len, canonical, unpacked_sha1);
137 has_packed = find_short_packed_object(len, res, packed_sha1);
138 if (!has_unpacked && !has_packed)
139 return SHORT_NAME_NOT_FOUND;
140 if (1 < has_unpacked || 1 < has_packed)
141 return SHORT_NAME_AMBIGUOUS;
142 if (has_unpacked != has_packed) {
143 memcpy(sha1, (has_packed ? packed_sha1 : unpacked_sha1), 20);
146 /* Both have unique ones -- do they match? */
147 if (memcmp(packed_sha1, unpacked_sha1, 20))
148 return SHORT_NAME_AMBIGUOUS;
149 memcpy(sha1, packed_sha1, 20);
153 static int get_short_sha1(const char *name, int len, unsigned char *sha1,
158 unsigned char res[20];
160 if (len < MINIMUM_ABBREV)
163 memset(canonical, 'x', 40);
164 for (i = 0; i < len ;i++) {
165 unsigned char c = name[i];
167 if (c >= '0' && c <= '9')
169 else if (c >= 'a' && c <= 'f')
171 else if (c >= 'A' && c <='F') {
183 status = find_unique_short_object(i, canonical, res, sha1);
184 if (!quietly && (status == SHORT_NAME_AMBIGUOUS))
185 return error("short SHA1 %.*s is ambiguous.", len, canonical);
189 const char *find_unique_abbrev(const unsigned char *sha1, int len)
194 is_null = !memcmp(sha1, null_sha1, 20);
195 memcpy(hex, sha1_to_hex(sha1), 40);
199 unsigned char sha1_ret[20];
200 status = get_short_sha1(hex, len, sha1_ret, 1);
202 (is_null && status != SHORT_NAME_AMBIGUOUS)) {
206 if (status != SHORT_NAME_AMBIGUOUS)
213 static int ambiguous_path(const char *path, int len)
218 for (cnt = 0; cnt < len; cnt++) {
238 static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
240 static const char *fmt[] = {
246 "refs/remotes/%.*s/HEAD",
249 static const char *warning = "warning: refname '%.*s' is ambiguous.\n";
250 const char **p, *pathname;
251 char *real_path = NULL;
252 int refs_found = 0, am;
253 unsigned long at_time = (unsigned long)-1;
254 unsigned char *this_result;
255 unsigned char sha1_from_ref[20];
257 if (len == 40 && !get_sha1_hex(str, sha1))
260 /* At a given period of time? "@{2 hours ago}" */
261 for (am = 1; am < len - 1; am++) {
262 if (str[am] == '@' && str[am+1] == '{' && str[len-1] == '}') {
263 int date_len = len - am - 3;
264 char *date_spec = xmalloc(date_len + 1);
265 strncpy(date_spec, str + am + 2, date_len);
266 date_spec[date_len] = 0;
267 at_time = approxidate(date_spec);
274 /* Accept only unambiguous ref paths. */
275 if (ambiguous_path(str, len))
278 for (p = fmt; *p; p++) {
279 this_result = refs_found ? sha1_from_ref : sha1;
280 pathname = resolve_ref(git_path(*p, len, str), this_result, 1);
283 real_path = strdup(pathname);
284 if (!warn_ambiguous_refs)
292 if (warn_ambiguous_refs && refs_found > 1)
293 fprintf(stderr, warning, len, str);
295 if (at_time != (unsigned long)-1) {
297 real_path + strlen(git_path(".")) - 1,
306 static int get_sha1_1(const char *name, int len, unsigned char *sha1);
308 static int get_parent(const char *name, int len,
309 unsigned char *result, int idx)
311 unsigned char sha1[20];
312 int ret = get_sha1_1(name, len, sha1);
313 struct commit *commit;
314 struct commit_list *p;
318 commit = lookup_commit_reference(sha1);
321 if (parse_commit(commit))
324 memcpy(result, commit->object.sha1, 20);
330 memcpy(result, p->item->object.sha1, 20);
338 static int get_nth_ancestor(const char *name, int len,
339 unsigned char *result, int generation)
341 unsigned char sha1[20];
342 int ret = get_sha1_1(name, len, sha1);
346 while (generation--) {
347 struct commit *commit = lookup_commit_reference(sha1);
349 if (!commit || parse_commit(commit) || !commit->parents)
351 memcpy(sha1, commit->parents->item->object.sha1, 20);
353 memcpy(result, sha1, 20);
357 static int peel_onion(const char *name, int len, unsigned char *sha1)
359 unsigned char outer[20];
361 const char *type_string = NULL;
365 * "ref^{type}" dereferences ref repeatedly until you cannot
366 * dereference anymore, or you get an object of given type,
367 * whichever comes first. "ref^{}" means just dereference
368 * tags until you get a non-tag. "ref^0" is a shorthand for
369 * "ref^{commit}". "commit^{tree}" could be used to find the
370 * top-level tree of the given commit.
372 if (len < 4 || name[len-1] != '}')
375 for (sp = name + len - 1; name <= sp; sp--) {
377 if (ch == '{' && name < sp && sp[-1] == '^')
383 sp++; /* beginning of type name, or closing brace for empty */
384 if (!strncmp(commit_type, sp, 6) && sp[6] == '}')
385 type_string = commit_type;
386 else if (!strncmp(tree_type, sp, 4) && sp[4] == '}')
387 type_string = tree_type;
388 else if (!strncmp(blob_type, sp, 4) && sp[4] == '}')
389 type_string = blob_type;
390 else if (sp[0] == '}')
395 if (get_sha1_1(name, sp - name - 2, outer))
398 o = parse_object(outer);
402 o = deref_tag(o, name, sp - name - 2);
403 if (!o || (!o->parsed && !parse_object(o->sha1)))
405 memcpy(sha1, o->sha1, 20);
408 /* At this point, the syntax look correct, so
409 * if we do not get the needed object, we should
414 if (!o || (!o->parsed && !parse_object(o->sha1)))
416 if (o->type == type_string) {
417 memcpy(sha1, o->sha1, 20);
420 if (o->type == tag_type)
421 o = ((struct tag*) o)->tagged;
422 else if (o->type == commit_type)
423 o = &(((struct commit *) o)->tree->object);
425 return error("%.*s: expected %s type, but the object dereferences to %s type",
426 len, name, type_string,
429 parse_object(o->sha1);
435 static int get_sha1_1(const char *name, int len, unsigned char *sha1)
440 /* "name~3" is "name^^^",
441 * "name~" and "name~0" are name -- not "name^0"!
442 * "name^" is not "name^0"; it is "name^1".
445 for (cp = name + len - 1; name <= cp; cp--) {
447 if ('0' <= ch && ch <= '9')
449 if (ch == '~' || ch == '^')
456 int len1 = cp - name;
458 while (cp < name + len)
459 num = num * 10 + *cp++ - '0';
460 if (has_suffix == '^') {
461 if (!num && len1 == len - 1)
463 return get_parent(name, len1, sha1, num);
465 /* else if (has_suffix == '~') -- goes without saying */
466 return get_nth_ancestor(name, len1, sha1, num);
469 ret = peel_onion(name, len, sha1);
473 ret = get_sha1_basic(name, len, sha1);
476 return get_short_sha1(name, len, sha1, 0);
480 * This is like "get_sha1_basic()", except it allows "sha1 expressions",
481 * notably "xyz^" for "parent of xyz"
483 int get_sha1(const char *name, unsigned char *sha1)
485 int ret, bracket_depth;
487 int namelen = strlen(name);
491 ret = get_sha1_1(name, namelen, sha1);
494 /* sha1:path --> object name of path in ent sha1
495 * :path -> object name of path in index
496 * :[0-3]:path -> object name of path in index at stage
498 if (name[0] == ':') {
500 struct cache_entry *ce;
504 name[1] < '0' || '3' < name[1])
507 stage = name[1] - '0';
510 namelen = namelen - (cp - name);
515 pos = cache_name_pos(cp, namelen);
518 while (pos < active_nr) {
519 ce = active_cache[pos];
520 if (ce_namelen(ce) != namelen ||
521 memcmp(ce->name, cp, namelen))
523 if (ce_stage(ce) == stage) {
524 memcpy(sha1, ce->sha1, 20);
531 for (cp = name, bracket_depth = 0; *cp; cp++) {
534 else if (bracket_depth && *cp == '}')
536 else if (!bracket_depth && *cp == ':')
540 unsigned char tree_sha1[20];
541 if (!get_sha1_1(name, cp-name, tree_sha1))
542 return get_tree_entry(tree_sha1, cp+1, sha1,