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ac250c56 BS |
1 | /* |
2 | * Copyright (C) 2009-2012 the libgit2 contributors | |
3 | * | |
4 | * This file is part of libgit2, distributed under the GNU GPL v2 with | |
5 | * a Linking Exception. For full terms see the included COPYING file. | |
6 | */ | |
7 | ||
8 | #include <assert.h> | |
9 | ||
10 | #include "common.h" | |
11 | #include "buffer.h" | |
244d2f6b | 12 | #include "tree.h" |
ac250c56 | 13 | |
a346992f | 14 | #include "git2.h" |
ac250c56 | 15 | |
cab65c2b | 16 | static int revspec_error(const char *revspec) |
023c6f69 | 17 | { |
cab65c2b | 18 | giterr_set(GITERR_INVALID, "Failed to parse revision specifier - Invalid pattern '%s'", revspec); |
19 | return -1; | |
023c6f69 BS |
20 | } |
21 | ||
e7279381 | 22 | static int disambiguate_refname(git_reference **out, git_repository *repo, const char *refname) |
ac250c56 | 23 | { |
e7279381 | 24 | int error, i; |
25 | bool fallbackmode = true; | |
26 | git_reference *ref; | |
27 | git_buf refnamebuf = GIT_BUF_INIT, name = GIT_BUF_INIT; | |
28 | ||
e28dd29b | 29 | static const char* formatters[] = { |
e7279381 | 30 | "%s", |
74a24005 | 31 | GIT_REFS_DIR "%s", |
32 | GIT_REFS_TAGS_DIR "%s", | |
33 | GIT_REFS_HEADS_DIR "%s", | |
34 | GIT_REFS_REMOTES_DIR "%s", | |
35 | GIT_REFS_REMOTES_DIR "%s/" GIT_HEAD_FILE, | |
e28dd29b | 36 | NULL |
37 | }; | |
e7279381 | 38 | |
39 | if (*refname) | |
40 | git_buf_puts(&name, refname); | |
41 | else { | |
b8748c12 | 42 | git_buf_puts(&name, GIT_HEAD_FILE); |
e7279381 | 43 | fallbackmode = false; |
44 | } | |
45 | ||
46 | for (i = 0; formatters[i] && (fallbackmode || i == 0); i++) { | |
47 | ||
48 | git_buf_clear(&refnamebuf); | |
49 | ||
50 | if ((error = git_buf_printf(&refnamebuf, formatters[i], git_buf_cstr(&name))) < 0) | |
51 | goto cleanup; | |
52 | ||
77e06d7e | 53 | if (!git_reference_is_valid_name(git_buf_cstr(&refnamebuf))) { |
54 | error = GIT_ENOTFOUND; | |
55 | continue; | |
56 | } | |
57 | ||
e7279381 | 58 | error = git_reference_lookup_resolved(&ref, repo, git_buf_cstr(&refnamebuf), -1); |
59 | ||
60 | if (!error) { | |
61 | *out = ref; | |
62 | error = 0; | |
63 | goto cleanup; | |
64 | } | |
65 | ||
66 | if (error != GIT_ENOTFOUND) | |
67 | goto cleanup; | |
68 | } | |
69 | ||
70 | cleanup: | |
71 | git_buf_free(&name); | |
72 | git_buf_free(&refnamebuf); | |
73 | return error; | |
74 | } | |
75 | ||
8f17ed80 | 76 | static int maybe_sha_or_abbrev(git_object**out, git_repository *repo, const char *spec) |
77 | { | |
78 | git_oid oid; | |
79 | size_t speclen = strlen(spec); | |
80 | ||
81 | if (git_oid_fromstrn(&oid, spec, speclen) < 0) | |
82 | return GIT_ENOTFOUND; | |
83 | ||
84 | return git_object_lookup_prefix(out, repo, &oid, speclen, GIT_OBJ_ANY); | |
85 | } | |
3e82d6c6 | 86 | |
b8748c12 | 87 | static int build_regex(regex_t *regex, const char *pattern) |
88 | { | |
89 | int error; | |
90 | ||
91 | if (*pattern == '\0') { | |
92 | giterr_set(GITERR_REGEX, "Empty pattern"); | |
93 | return -1; | |
94 | } | |
95 | ||
96 | error = regcomp(regex, pattern, REG_EXTENDED); | |
97 | if (!error) | |
98 | return 0; | |
99 | ||
100 | giterr_set_regex(regex, error); | |
101 | regfree(regex); | |
102 | ||
103 | return -1; | |
104 | } | |
105 | ||
3e82d6c6 | 106 | static int maybe_describe(git_object**out, git_repository *repo, const char *spec) |
e7279381 | 107 | { |
e28dd29b | 108 | const char *substr; |
b8748c12 | 109 | int error; |
110 | regex_t regex; | |
e28dd29b | 111 | |
e28dd29b | 112 | substr = strstr(spec, "-g"); |
e28dd29b | 113 | |
3e82d6c6 | 114 | if (substr == NULL) |
115 | return GIT_ENOTFOUND; | |
116 | ||
b8748c12 | 117 | if (build_regex(®ex, ".+-[0-9]+-g[0-9a-fA-F]+") < 0) |
118 | return -1; | |
3e82d6c6 | 119 | |
b8748c12 | 120 | error = regexec(®ex, spec, 0, NULL, 0); |
121 | regfree(®ex); | |
122 | ||
123 | if (error) | |
3e82d6c6 | 124 | return GIT_ENOTFOUND; |
125 | ||
8f17ed80 | 126 | return maybe_sha_or_abbrev(out, repo, substr+2); |
3e82d6c6 | 127 | } |
128 | ||
8f17ed80 | 129 | static int revparse_lookup_object(git_object **out, git_repository *repo, const char *spec) |
3e82d6c6 | 130 | { |
131 | int error; | |
132 | git_reference *ref; | |
133 | ||
134 | error = maybe_describe(out, repo, spec); | |
135 | if (!error) | |
136 | return 0; | |
137 | ||
138 | if (error < 0 && error != GIT_ENOTFOUND) | |
139 | return error; | |
140 | ||
e7279381 | 141 | error = disambiguate_refname(&ref, repo, spec); |
142 | if (!error) { | |
143 | error = git_object_lookup(out, repo, git_reference_oid(ref), GIT_OBJ_ANY); | |
144 | git_reference_free(ref); | |
b5f90115 | 145 | return error; |
e28dd29b | 146 | } |
147 | ||
d1b7921a | 148 | if (error < 0 && error != GIT_ENOTFOUND) |
149 | return error; | |
150 | ||
151 | error = maybe_sha_or_abbrev(out, repo, spec); | |
152 | if (!error) | |
153 | return 0; | |
154 | ||
3e82d6c6 | 155 | if (error < 0 && error != GIT_ENOTFOUND) |
e7279381 | 156 | return error; |
e28dd29b | 157 | |
158 | giterr_set(GITERR_REFERENCE, "Refspec '%s' not found.", spec); | |
4de89ce7 | 159 | return GIT_ENOTFOUND; |
ac250c56 BS |
160 | } |
161 | ||
b8748c12 | 162 | static int try_parse_numeric(int *n, const char *curly_braces_content) |
a346992f | 163 | { |
b8748c12 | 164 | int content; |
165 | const char *end_ptr; | |
166 | ||
167 | if (git__strtol32(&content, curly_braces_content, &end_ptr, 10) < 0) | |
168 | return -1; | |
29f72aa6 | 169 | |
b8748c12 | 170 | if (*end_ptr != '\0') |
171 | return -1; | |
29f72aa6 | 172 | |
b8748c12 | 173 | *n = content; |
174 | return 0; | |
a346992f BS |
175 | } |
176 | ||
b8748c12 | 177 | static int retrieve_previously_checked_out_branch_or_revision(git_object **out, git_reference **base_ref, git_repository *repo, const char *spec, const char *identifier, unsigned int position) |
ac250c56 | 178 | { |
b8748c12 | 179 | git_reference *ref = NULL; |
e28dd29b | 180 | git_reflog *reflog = NULL; |
b8748c12 | 181 | regex_t preg; |
182 | int numentries, i, cur, error = -1; | |
e28dd29b | 183 | const git_reflog_entry *entry; |
b8748c12 | 184 | const char *msg; |
185 | regmatch_t regexmatches[2]; | |
e28dd29b | 186 | git_buf buf = GIT_BUF_INIT; |
e28dd29b | 187 | |
b8748c12 | 188 | cur = position; |
e28dd29b | 189 | |
b8748c12 | 190 | if (*identifier != '\0' || *base_ref != NULL) |
191 | return revspec_error(spec); | |
e28dd29b | 192 | |
b8748c12 | 193 | if (build_regex(&preg, "checkout: moving from (.*) to .*") < 0) |
194 | return -1; | |
cab65c2b | 195 | |
b8748c12 | 196 | if (git_reference_lookup(&ref, repo, GIT_HEAD_FILE) < 0) |
197 | goto cleanup; | |
e28dd29b | 198 | |
b8748c12 | 199 | if (git_reflog_read(&reflog, ref) < 0) |
200 | goto cleanup; | |
201 | ||
202 | numentries = git_reflog_entrycount(reflog); | |
203 | ||
204 | for (i = numentries - 1; i >= 0; i--) { | |
205 | entry = git_reflog_entry_byindex(reflog, i); | |
206 | msg = git_reflog_entry_msg(entry); | |
207 | ||
208 | if (regexec(&preg, msg, 2, regexmatches, 0)) | |
209 | continue; | |
210 | ||
211 | cur--; | |
212 | ||
213 | if (cur > 0) | |
214 | continue; | |
215 | ||
216 | git_buf_put(&buf, msg+regexmatches[1].rm_so, regexmatches[1].rm_eo - regexmatches[1].rm_so); | |
217 | ||
218 | if ((error = disambiguate_refname(base_ref, repo, git_buf_cstr(&buf))) == 0) | |
219 | goto cleanup; | |
220 | ||
221 | if (error < 0 && error != GIT_ENOTFOUND) | |
222 | goto cleanup; | |
223 | ||
224 | error = maybe_sha_or_abbrev(out, repo, git_buf_cstr(&buf)); | |
225 | ||
226 | goto cleanup; | |
227 | } | |
228 | ||
229 | error = GIT_ENOTFOUND; | |
230 | ||
231 | cleanup: | |
232 | git_reference_free(ref); | |
233 | git_buf_free(&buf); | |
234 | regfree(&preg); | |
235 | git_reflog_free(reflog); | |
236 | return error; | |
237 | } | |
238 | ||
239 | static int retrieve_oid_from_reflog(git_oid *oid, git_reference *ref, unsigned int identifier) | |
240 | { | |
241 | git_reflog *reflog; | |
242 | int error = -1; | |
243 | unsigned int numentries; | |
244 | const git_reflog_entry *entry; | |
245 | bool search_by_pos = (identifier <= 100000000); | |
246 | ||
247 | if (git_reflog_read(&reflog, ref) < 0) | |
248 | return -1; | |
249 | ||
250 | numentries = git_reflog_entrycount(reflog); | |
251 | ||
252 | if (search_by_pos) { | |
253 | if (numentries < identifier + 1) { | |
254 | giterr_set( | |
255 | GITERR_REFERENCE, | |
256 | "Reflog for '%s' has only %d entries, asked for %d", | |
257 | git_reference_name(ref), | |
258 | numentries, | |
259 | identifier); | |
260 | ||
261 | error = GIT_ENOTFOUND; | |
262 | goto cleanup; | |
e28dd29b | 263 | } |
b8748c12 | 264 | |
265 | entry = git_reflog_entry_byindex(reflog, identifier); | |
266 | git_oid_cpy(oid, git_reflog_entry_oidold(entry)); | |
267 | error = 0; | |
268 | goto cleanup; | |
269 | ||
e28dd29b | 270 | } else { |
b8748c12 | 271 | int i; |
272 | git_time commit_time; | |
e28dd29b | 273 | |
b8748c12 | 274 | for (i = numentries - 1; i >= 0; i--) { |
275 | entry = git_reflog_entry_byindex(reflog, i); | |
276 | commit_time = git_reflog_entry_committer(entry)->when; | |
277 | ||
278 | if (commit_time.time - identifier > 0) | |
279 | continue; | |
e7279381 | 280 | |
b8748c12 | 281 | git_oid_cpy(oid, git_reflog_entry_oidnew(entry)); |
282 | error = 0; | |
e7279381 | 283 | goto cleanup; |
284 | } | |
285 | ||
b8748c12 | 286 | error = GIT_ENOTFOUND; |
287 | } | |
e28dd29b | 288 | |
b8748c12 | 289 | cleanup: |
290 | git_reflog_free(reflog); | |
291 | return error; | |
292 | } | |
e28dd29b | 293 | |
b8748c12 | 294 | static int retrieve_revobject_from_reflog(git_object **out, git_reference **base_ref, git_repository *repo, const char *identifier, unsigned int position) |
295 | { | |
296 | git_reference *ref; | |
297 | git_oid oid; | |
298 | int error = -1; | |
e28dd29b | 299 | |
b8748c12 | 300 | if (*base_ref == NULL) { |
301 | if ((error = disambiguate_refname(&ref, repo, identifier)) < 0) | |
302 | return error; | |
303 | } else { | |
304 | ref = *base_ref; | |
305 | *base_ref = NULL; | |
306 | } | |
e28dd29b | 307 | |
b8748c12 | 308 | if (position == 0) { |
309 | error = git_object_lookup(out, repo, git_reference_oid(ref), GIT_OBJ_ANY); | |
310 | goto cleanup; | |
311 | } | |
e28dd29b | 312 | |
b8748c12 | 313 | if ((error = retrieve_oid_from_reflog(&oid, ref, position)) < 0) |
314 | goto cleanup; | |
e28dd29b | 315 | |
b8748c12 | 316 | error = git_object_lookup(out, repo, &oid, GIT_OBJ_ANY); |
317 | ||
318 | cleanup: | |
319 | git_reference_free(ref); | |
320 | return error; | |
321 | } | |
322 | ||
323 | static int retrieve_remote_tracking_reference(git_reference **base_ref, const char *identifier, git_repository *repo) | |
324 | { | |
325 | git_reference *tracking, *ref; | |
326 | int error = -1; | |
327 | ||
328 | if (*base_ref == NULL) { | |
329 | if ((error = disambiguate_refname(&ref, repo, identifier)) < 0) | |
330 | return error; | |
331 | } else { | |
332 | ref = *base_ref; | |
333 | *base_ref = NULL; | |
e28dd29b | 334 | } |
335 | ||
fb910281 | 336 | if ((error = git_branch_tracking(&tracking, ref)) < 0) |
b8748c12 | 337 | goto cleanup; |
338 | ||
339 | *base_ref = tracking; | |
340 | ||
e7279381 | 341 | cleanup: |
b8748c12 | 342 | git_reference_free(ref); |
343 | return error; | |
344 | } | |
345 | ||
b8457baa | 346 | static int handle_at_syntax(git_object **out, git_reference **ref, const char *spec, size_t identifier_len, git_repository* repo, const char *curly_braces_content) |
b8748c12 | 347 | { |
348 | bool is_numeric; | |
7e48635d | 349 | int parsed = 0, error = -1; |
b8748c12 | 350 | git_buf identifier = GIT_BUF_INIT; |
351 | git_time_t timestamp; | |
352 | ||
353 | assert(*out == NULL); | |
354 | ||
355 | if (git_buf_put(&identifier, spec, identifier_len) < 0) | |
356 | return -1; | |
357 | ||
358 | is_numeric = !try_parse_numeric(&parsed, curly_braces_content); | |
359 | ||
360 | if (*curly_braces_content == '-' && (!is_numeric || parsed == 0)) { | |
361 | error = revspec_error(spec); | |
362 | goto cleanup; | |
363 | } | |
364 | ||
365 | if (is_numeric) { | |
366 | if (parsed < 0) | |
367 | error = retrieve_previously_checked_out_branch_or_revision(out, ref, repo, spec, git_buf_cstr(&identifier), -parsed); | |
368 | else | |
369 | error = retrieve_revobject_from_reflog(out, ref, repo, git_buf_cstr(&identifier), parsed); | |
370 | ||
371 | goto cleanup; | |
372 | } | |
373 | ||
374 | if (!strcmp(curly_braces_content, "u") || !strcmp(curly_braces_content, "upstream")) { | |
375 | error = retrieve_remote_tracking_reference(ref, git_buf_cstr(&identifier), repo); | |
376 | ||
377 | goto cleanup; | |
378 | } | |
379 | ||
380 | if (git__date_parse(×tamp, curly_braces_content) < 0) | |
381 | goto cleanup; | |
382 | ||
383 | error = retrieve_revobject_from_reflog(out, ref, repo, git_buf_cstr(&identifier), (unsigned int)timestamp); | |
384 | ||
385 | cleanup: | |
386 | git_buf_free(&identifier); | |
387 | return error; | |
023c6f69 BS |
388 | } |
389 | ||
9d7bdf71 BS |
390 | static git_otype parse_obj_type(const char *str) |
391 | { | |
b8748c12 | 392 | if (!strcmp(str, "commit")) |
393 | return GIT_OBJ_COMMIT; | |
394 | ||
395 | if (!strcmp(str, "tree")) | |
396 | return GIT_OBJ_TREE; | |
397 | ||
398 | if (!strcmp(str, "blob")) | |
399 | return GIT_OBJ_BLOB; | |
400 | ||
401 | if (!strcmp(str, "tag")) | |
402 | return GIT_OBJ_TAG; | |
403 | ||
e28dd29b | 404 | return GIT_OBJ_BAD; |
9d7bdf71 BS |
405 | } |
406 | ||
b8748c12 | 407 | static int dereference_to_non_tag(git_object **out, git_object *obj) |
023c6f69 | 408 | { |
b8748c12 | 409 | if (git_object_type(obj) == GIT_OBJ_TAG) |
410 | return git_tag_peel(out, (git_tag *)obj); | |
e28dd29b | 411 | |
b8748c12 | 412 | return git_object__dup(out, obj); |
413 | } | |
e28dd29b | 414 | |
b8748c12 | 415 | static int handle_caret_parent_syntax(git_object **out, git_object *obj, int n) |
416 | { | |
417 | git_object *temp_commit = NULL; | |
418 | int error; | |
e28dd29b | 419 | |
e2c81fca | 420 | if (git_object_peel(&temp_commit, obj, GIT_OBJ_COMMIT) < 0) |
b8748c12 | 421 | return -1; |
e28dd29b | 422 | |
e28dd29b | 423 | if (n == 0) { |
b8748c12 | 424 | *out = temp_commit; |
e28dd29b | 425 | return 0; |
426 | } | |
427 | ||
b8748c12 | 428 | error = git_commit_parent((git_commit **)out, (git_commit*)temp_commit, n - 1); |
e28dd29b | 429 | |
b8748c12 | 430 | git_object_free(temp_commit); |
431 | return error; | |
023c6f69 | 432 | } |
ac250c56 | 433 | |
b8748c12 | 434 | static int handle_linear_syntax(git_object **out, git_object *obj, int n) |
38533d5a | 435 | { |
b8748c12 | 436 | git_object *temp_commit = NULL; |
437 | int error; | |
e28dd29b | 438 | |
e2c81fca | 439 | if (git_object_peel(&temp_commit, obj, GIT_OBJ_COMMIT) < 0) |
b8748c12 | 440 | return -1; |
e28dd29b | 441 | |
b8748c12 | 442 | error = git_commit_nth_gen_ancestor((git_commit **)out, (git_commit*)temp_commit, n); |
e28dd29b | 443 | |
b8748c12 | 444 | git_object_free(temp_commit); |
445 | return error; | |
38533d5a BS |
446 | } |
447 | ||
b8748c12 | 448 | static int handle_colon_syntax( |
449 | git_object **out, | |
e28dd29b | 450 | git_object *obj, |
451 | const char *path) | |
244d2f6b | 452 | { |
b8748c12 | 453 | git_object *tree; |
bb89cf94 | 454 | int error = -1; |
455 | git_tree_entry *entry = NULL; | |
244d2f6b | 456 | |
e2c81fca | 457 | if (git_object_peel(&tree, obj, GIT_OBJ_TREE) < 0) |
b8748c12 | 458 | return -1; |
244d2f6b | 459 | |
b8748c12 | 460 | if (*path == '\0') { |
461 | *out = tree; | |
462 | return 0; | |
463 | } | |
053b5096 | 464 | |
bb89cf94 | 465 | /* |
466 | * TODO: Handle the relative path syntax | |
467 | * (:./relative/path and :../relative/path) | |
468 | */ | |
469 | if ((error = git_tree_entry_bypath(&entry, (git_tree *)tree, path)) < 0) | |
470 | goto cleanup; | |
471 | ||
b8748c12 | 472 | error = git_tree_entry_to_object(out, git_object_owner(tree), entry); |
053b5096 | 473 | |
bb89cf94 | 474 | cleanup: |
475 | git_tree_entry_free(entry); | |
b8748c12 | 476 | git_object_free(tree); |
bb89cf94 | 477 | |
478 | return error; | |
244d2f6b BS |
479 | } |
480 | ||
b8748c12 | 481 | static int walk_and_search(git_object **out, git_revwalk *walk, regex_t *regex) |
734efe4b | 482 | { |
b8748c12 | 483 | int error; |
484 | git_oid oid; | |
485 | git_object *obj; | |
486 | ||
487 | while (!(error = git_revwalk_next(&oid, walk))) { | |
e28dd29b | 488 | |
b8748c12 | 489 | if ((error = git_object_lookup(&obj, git_revwalk_repository(walk), &oid, GIT_OBJ_COMMIT) < 0) && |
490 | (error != GIT_ENOTFOUND)) | |
491 | return -1; | |
492 | ||
493 | if (!regexec(regex, git_commit_message((git_commit*)obj), 0, NULL, 0)) { | |
494 | *out = obj; | |
495 | return 0; | |
496 | } | |
497 | ||
498 | git_object_free(obj); | |
e28dd29b | 499 | } |
500 | ||
f335ecd6 | 501 | if (error < 0 && error == GIT_ITEROVER) |
b8748c12 | 502 | error = GIT_ENOTFOUND; |
503 | ||
504 | return error; | |
505 | } | |
506 | ||
507 | static int handle_grep_syntax(git_object **out, git_repository *repo, const git_oid *spec_oid, const char *pattern) | |
508 | { | |
509 | regex_t preg; | |
510 | git_revwalk *walk = NULL; | |
511 | int error = -1; | |
512 | ||
513 | if (build_regex(&preg, pattern) < 0) | |
514 | return -1; | |
515 | ||
516 | if (git_revwalk_new(&walk, repo) < 0) | |
517 | goto cleanup; | |
518 | ||
519 | git_revwalk_sorting(walk, GIT_SORT_TIME); | |
520 | ||
521 | if (spec_oid == NULL) { | |
522 | // TODO: @carlosmn: The glob should be refs/* but this makes git_revwalk_next() fails | |
74a24005 | 523 | if (git_revwalk_push_glob(walk, GIT_REFS_HEADS_DIR "*") < 0) |
b8748c12 | 524 | goto cleanup; |
525 | } else if (git_revwalk_push(walk, spec_oid) < 0) | |
526 | goto cleanup; | |
527 | ||
528 | error = walk_and_search(out, walk, &preg); | |
529 | ||
530 | cleanup: | |
531 | regfree(&preg); | |
532 | git_revwalk_free(walk); | |
533 | ||
534 | return error; | |
535 | } | |
536 | ||
537 | static int handle_caret_curly_syntax(git_object **out, git_object *obj, const char *curly_braces_content) | |
538 | { | |
539 | git_otype expected_type; | |
540 | ||
541 | if (*curly_braces_content == '\0') | |
542 | return dereference_to_non_tag(out, obj); | |
543 | ||
544 | if (*curly_braces_content == '/') | |
545 | return handle_grep_syntax(out, git_object_owner(obj), git_object_id(obj), curly_braces_content + 1); | |
546 | ||
547 | expected_type = parse_obj_type(curly_braces_content); | |
548 | ||
549 | if (expected_type == GIT_OBJ_BAD) | |
550 | return -1; | |
551 | ||
e2c81fca | 552 | return git_object_peel(out, obj, expected_type); |
b8748c12 | 553 | } |
554 | ||
b8457baa | 555 | static int extract_curly_braces_content(git_buf *buf, const char *spec, size_t *pos) |
b8748c12 | 556 | { |
557 | git_buf_clear(buf); | |
558 | ||
559 | assert(spec[*pos] == '^' || spec[*pos] == '@'); | |
560 | ||
561 | (*pos)++; | |
562 | ||
563 | if (spec[*pos] == '\0' || spec[*pos] != '{') | |
564 | return revspec_error(spec); | |
565 | ||
566 | (*pos)++; | |
567 | ||
568 | while (spec[*pos] != '}') { | |
569 | if (spec[*pos] == '\0') | |
570 | return revspec_error(spec); | |
571 | ||
572 | git_buf_putc(buf, spec[(*pos)++]); | |
573 | } | |
574 | ||
575 | (*pos)++; | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
b8457baa | 580 | static int extract_path(git_buf *buf, const char *spec, size_t *pos) |
b8748c12 | 581 | { |
582 | git_buf_clear(buf); | |
583 | ||
584 | assert(spec[*pos] == ':'); | |
585 | ||
586 | (*pos)++; | |
587 | ||
588 | if (git_buf_puts(buf, spec + *pos) < 0) | |
589 | return -1; | |
590 | ||
591 | *pos += git_buf_len(buf); | |
592 | ||
593 | return 0; | |
594 | } | |
595 | ||
b8457baa | 596 | static int extract_how_many(int *n, const char *spec, size_t *pos) |
b8748c12 | 597 | { |
598 | const char *end_ptr; | |
599 | int parsed, accumulated; | |
600 | char kind = spec[*pos]; | |
601 | ||
602 | assert(spec[*pos] == '^' || spec[*pos] == '~'); | |
603 | ||
604 | accumulated = 0; | |
605 | ||
606 | do { | |
607 | do { | |
608 | (*pos)++; | |
609 | accumulated++; | |
610 | } while (spec[(*pos)] == kind && kind == '~'); | |
611 | ||
612 | if (git__isdigit(spec[*pos])) { | |
613 | if ((git__strtol32(&parsed, spec + *pos, &end_ptr, 10) < 0) < 0) | |
614 | return revspec_error(spec); | |
615 | ||
616 | accumulated += (parsed - 1); | |
617 | *pos = end_ptr - spec; | |
e28dd29b | 618 | } |
b8748c12 | 619 | |
620 | } while (spec[(*pos)] == kind && kind == '~'); | |
621 | ||
622 | *n = accumulated; | |
623 | ||
624 | return 0; | |
625 | } | |
626 | ||
627 | static int object_from_reference(git_object **object, git_reference *reference) | |
628 | { | |
629 | git_reference *resolved = NULL; | |
630 | int error; | |
631 | ||
632 | if (git_reference_resolve(&resolved, reference) < 0) | |
633 | return -1; | |
634 | ||
635 | error = git_object_lookup(object, reference->owner, git_reference_oid(resolved), GIT_OBJ_ANY); | |
636 | git_reference_free(resolved); | |
637 | ||
638 | return error; | |
639 | } | |
640 | ||
b8457baa | 641 | static int ensure_base_rev_loaded(git_object **object, git_reference **reference, const char *spec, size_t identifier_len, git_repository *repo, bool allow_empty_identifier) |
b8748c12 | 642 | { |
643 | int error; | |
644 | git_buf identifier = GIT_BUF_INIT; | |
645 | ||
646 | if (*object != NULL) | |
647 | return 0; | |
648 | ||
649 | if (*reference != NULL) { | |
650 | if ((error = object_from_reference(object, *reference)) < 0) | |
651 | return error; | |
652 | ||
653 | git_reference_free(*reference); | |
654 | *reference = NULL; | |
655 | return 0; | |
e28dd29b | 656 | } |
657 | ||
b8748c12 | 658 | if (!allow_empty_identifier && identifier_len == 0) |
659 | return revspec_error(spec); | |
660 | ||
661 | if (git_buf_put(&identifier, spec, identifier_len) < 0) | |
662 | return -1; | |
663 | ||
664 | error = revparse_lookup_object(object, repo, git_buf_cstr(&identifier)); | |
665 | git_buf_free(&identifier); | |
666 | ||
667 | return error; | |
668 | } | |
669 | ||
670 | static int ensure_base_rev_is_not_known_yet(git_object *object, const char *spec) | |
671 | { | |
672 | if (object == NULL) | |
673 | return 0; | |
674 | ||
675 | return revspec_error(spec); | |
676 | } | |
677 | ||
b8457baa | 678 | static bool any_left_hand_identifier(git_object *object, git_reference *reference, size_t identifier_len) |
b8748c12 | 679 | { |
680 | if (object != NULL) | |
681 | return true; | |
682 | ||
683 | if (reference != NULL) | |
684 | return true; | |
685 | ||
686 | if (identifier_len > 0) | |
687 | return true; | |
688 | ||
689 | return false; | |
690 | } | |
691 | ||
692 | static int ensure_left_hand_identifier_is_not_known_yet(git_object *object, git_reference *reference, const char *spec) | |
693 | { | |
694 | if (!ensure_base_rev_is_not_known_yet(object, spec) && reference == NULL) | |
695 | return 0; | |
696 | ||
697 | return revspec_error(spec); | |
734efe4b BS |
698 | } |
699 | ||
ac250c56 BS |
700 | int git_revparse_single(git_object **out, git_repository *repo, const char *spec) |
701 | { | |
b8457baa | 702 | size_t pos = 0, identifier_len = 0; |
b8748c12 | 703 | int error = -1, n; |
704 | git_buf buf = GIT_BUF_INIT; | |
705 | ||
706 | git_reference *reference = NULL; | |
707 | git_object *base_rev = NULL; | |
e28dd29b | 708 | |
709 | assert(out && repo && spec); | |
710 | ||
b8748c12 | 711 | *out = NULL; |
e28dd29b | 712 | |
279b45b0 | 713 | while (spec[pos]) { |
b8748c12 | 714 | switch (spec[pos]) { |
715 | case '^': | |
716 | if ((error = ensure_base_rev_loaded(&base_rev, &reference, spec, identifier_len, repo, false)) < 0) | |
717 | goto cleanup; | |
e28dd29b | 718 | |
b8748c12 | 719 | if (spec[pos+1] == '{') { |
720 | git_object *temp_object = NULL; | |
e28dd29b | 721 | |
b8748c12 | 722 | if ((error = extract_curly_braces_content(&buf, spec, &pos)) < 0) |
723 | goto cleanup; | |
e28dd29b | 724 | |
b8748c12 | 725 | if ((error = handle_caret_curly_syntax(&temp_object, base_rev, git_buf_cstr(&buf))) < 0) |
726 | goto cleanup; | |
727 | ||
728 | git_object_free(base_rev); | |
729 | base_rev = temp_object; | |
e28dd29b | 730 | } else { |
b8748c12 | 731 | git_object *temp_object = NULL; |
732 | ||
733 | if ((error = extract_how_many(&n, spec, &pos)) < 0) | |
734 | goto cleanup; | |
735 | ||
736 | if ((error = handle_caret_parent_syntax(&temp_object, base_rev, n)) < 0) | |
737 | goto cleanup; | |
738 | ||
739 | git_object_free(base_rev); | |
740 | base_rev = temp_object; | |
e28dd29b | 741 | } |
e28dd29b | 742 | break; |
743 | ||
b8748c12 | 744 | case '~': |
745 | { | |
746 | git_object *temp_object = NULL; | |
747 | ||
748 | if ((error = extract_how_many(&n, spec, &pos)) < 0) | |
749 | goto cleanup; | |
750 | ||
751 | if ((error = ensure_base_rev_loaded(&base_rev, &reference, spec, identifier_len, repo, false)) < 0) | |
752 | goto cleanup; | |
753 | ||
754 | if ((error = handle_linear_syntax(&temp_object, base_rev, n)) < 0) | |
755 | goto cleanup; | |
756 | ||
757 | git_object_free(base_rev); | |
758 | base_rev = temp_object; | |
e28dd29b | 759 | break; |
b8748c12 | 760 | } |
e28dd29b | 761 | |
b8748c12 | 762 | case ':': |
763 | { | |
764 | git_object *temp_object = NULL; | |
765 | ||
766 | if ((error = extract_path(&buf, spec, &pos)) < 0) | |
767 | goto cleanup; | |
768 | ||
769 | if (any_left_hand_identifier(base_rev, reference, identifier_len)) { | |
770 | if ((error = ensure_base_rev_loaded(&base_rev, &reference, spec, identifier_len, repo, true)) < 0) | |
771 | goto cleanup; | |
772 | ||
773 | if ((error = handle_colon_syntax(&temp_object, base_rev, git_buf_cstr(&buf))) < 0) | |
774 | goto cleanup; | |
e28dd29b | 775 | } else { |
b8748c12 | 776 | if (*git_buf_cstr(&buf) == '/') { |
777 | if ((error = handle_grep_syntax(&temp_object, repo, NULL, git_buf_cstr(&buf) + 1)) < 0) | |
778 | goto cleanup; | |
779 | } else { | |
780 | ||
781 | /* | |
782 | * TODO: support merge-stage path lookup (":2:Makefile") | |
783 | * and plain index blob lookup (:i-am/a/blob) | |
784 | */ | |
785 | giterr_set(GITERR_INVALID, "Unimplemented"); | |
786 | error = GIT_ERROR; | |
787 | goto cleanup; | |
788 | } | |
e28dd29b | 789 | } |
b8748c12 | 790 | |
791 | git_object_free(base_rev); | |
792 | base_rev = temp_object; | |
e28dd29b | 793 | break; |
b8748c12 | 794 | } |
795 | ||
796 | case '@': | |
797 | { | |
798 | git_object *temp_object = NULL; | |
e28dd29b | 799 | |
b8748c12 | 800 | if ((error = extract_curly_braces_content(&buf, spec, &pos)) < 0) |
801 | goto cleanup; | |
802 | ||
803 | if ((error = ensure_base_rev_is_not_known_yet(base_rev, spec)) < 0) | |
804 | goto cleanup; | |
805 | ||
806 | if ((error = handle_at_syntax(&temp_object, &reference, spec, identifier_len, repo, git_buf_cstr(&buf))) < 0) | |
807 | goto cleanup; | |
808 | ||
809 | if (temp_object != NULL) | |
810 | base_rev = temp_object; | |
e28dd29b | 811 | break; |
812 | } | |
813 | ||
b8748c12 | 814 | default: |
815 | if ((error = ensure_left_hand_identifier_is_not_known_yet(base_rev, reference, spec)) < 0) | |
816 | goto cleanup; | |
817 | ||
818 | pos++; | |
819 | identifier_len++; | |
e28dd29b | 820 | } |
279b45b0 | 821 | } |
e28dd29b | 822 | |
279b45b0 | 823 | if ((error = ensure_base_rev_loaded(&base_rev, &reference, spec, identifier_len, repo, false)) < 0) |
b8748c12 | 824 | goto cleanup; |
825 | ||
826 | *out = base_rev; | |
827 | error = 0; | |
e28dd29b | 828 | |
b8748c12 | 829 | cleanup: |
830 | if (error) | |
831 | git_object_free(base_rev); | |
832 | git_reference_free(reference); | |
833 | git_buf_free(&buf); | |
834 | return error; | |
ac250c56 | 835 | } |