op public repos

Blob

Date:: Sat Jun 29 21:26:36 2019 UTC
Message:: disambiguate abbreviated object IDs based on object type
Actions:: History | Blame | Raw File
1 /*
2  * Copyright (c) 2018, 2019 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/socket.h>
22 #include <sys/syslimits.h>
23 #include <sys/wait.h>
24 
25 #include <errno.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <stdint.h>
30 #include <sha1.h>
31 #include <zlib.h>
32 #include <ctype.h>
33 #include <limits.h>
34 #include <imsg.h>
35 #include <time.h>
36 #include <unistd.h>
37 
38 #include "got_error.h"
39 #include "got_object.h"
40 #include "got_repository.h"
41 #include "got_opentemp.h"
42 #include "got_path.h"
43 
44 #include "got_lib_sha1.h"
45 #include "got_lib_delta.h"
46 #include "got_lib_inflate.h"
47 #include "got_lib_object.h"
48 #include "got_lib_object_cache.h"
49 #include "got_lib_pack.h"
50 #include "got_lib_privsep.h"
51 #include "got_lib_repository.h"
52 
53 #ifndef nitems
54 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
55 #endif
56 
57 int
58 got_object_id_cmp(const struct got_object_id *id1,
59     const struct got_object_id *id2)
60 {
61 	return memcmp(id1->sha1, id2->sha1, SHA1_DIGEST_LENGTH);
62 }
63 
64 const struct got_error *
65 got_object_qid_alloc_partial(struct got_object_qid **qid)
66 {
67 	const struct got_error *err = NULL;
68 
69 	*qid = malloc(sizeof(**qid));
70 	if (*qid == NULL)
71 		return got_error_from_errno("malloc");
72 
73 	(*qid)->id = malloc(sizeof(*((*qid)->id)));
74 	if ((*qid)->id == NULL) {
75 		err = got_error_from_errno("malloc");
76 		got_object_qid_free(*qid);
77 		*qid = NULL;
78 		return err;
79 	}
80 
81 	return NULL;
82 }
83 
84 const struct got_error *
85 got_object_id_str(char **outbuf, struct got_object_id *id)
86 {
87 	static const size_t len = SHA1_DIGEST_STRING_LENGTH;
88 
89 	*outbuf = malloc(len);
90 	if (*outbuf == NULL)
91 		return got_error_from_errno("malloc");
92 
93 	if (got_sha1_digest_to_str(id->sha1, *outbuf, len) == NULL) {
94 		free(*outbuf);
95 		*outbuf = NULL;
96 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
97 	}
98 
99 	return NULL;
100 }
101 
102 void
103 got_object_close(struct got_object *obj)
104 {
105 	if (obj->refcnt > 0) {
106 		obj->refcnt--;
107 		if (obj->refcnt > 0)
108 			return;
109 	}
110 
111 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
112 		struct got_delta *delta;
113 		while (!SIMPLEQ_EMPTY(&obj->deltas.entries)) {
114 			delta = SIMPLEQ_FIRST(&obj->deltas.entries);
115 			SIMPLEQ_REMOVE_HEAD(&obj->deltas.entries, entry);
116 			got_delta_close(delta);
117 		}
118 	}
119 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
120 		free(obj->path_packfile);
121 	free(obj);
122 }
123 
124 void
125 got_object_qid_free(struct got_object_qid *qid)
126 {
127 	free(qid->id);
128 	free(qid);
129 }
130 
131 void
132 got_object_id_queue_free(struct got_object_id_queue *ids)
133 {
134 	struct got_object_qid *qid;
135 
136 	while (!SIMPLEQ_EMPTY(ids)) {
137 		qid = SIMPLEQ_FIRST(ids);
138 		SIMPLEQ_REMOVE_HEAD(ids, entry);
139 		got_object_qid_free(qid);
140 	}
141 }
142 
143 const struct got_error *
144 got_object_parse_header(struct got_object **obj, char *buf, size_t len)
145 {
146 	const char *obj_labels[] = {
147 		GOT_OBJ_LABEL_COMMIT,
148 		GOT_OBJ_LABEL_TREE,
149 		GOT_OBJ_LABEL_BLOB,
150 		GOT_OBJ_LABEL_TAG,
151 	};
152 	const int obj_types[] = {
153 		GOT_OBJ_TYPE_COMMIT,
154 		GOT_OBJ_TYPE_TREE,
155 		GOT_OBJ_TYPE_BLOB,
156 		GOT_OBJ_TYPE_TAG,
157 	};
158 	int type = 0;
159 	size_t size = 0, hdrlen = 0;
160 	int i;
161 
162 	*obj = NULL;
163 
164 	hdrlen = strnlen(buf, len) + 1 /* '\0' */;
165 	if (hdrlen > len)
166 		return got_error(GOT_ERR_BAD_OBJ_HDR);
167 
168 	for (i = 0; i < nitems(obj_labels); i++) {
169 		const char *label = obj_labels[i];
170 		size_t label_len = strlen(label);
171 		const char *errstr;
172 
173 		if (strncmp(buf, label, label_len) != 0)
174 			continue;
175 
176 		type = obj_types[i];
177 		if (len <= label_len)
178 			return got_error(GOT_ERR_BAD_OBJ_HDR);
179 		size = strtonum(buf + label_len, 0, LONG_MAX, &errstr);
180 		if (errstr != NULL)
181 			return got_error(GOT_ERR_BAD_OBJ_HDR);
182 		break;
183 	}
184 
185 	if (type == 0)
186 		return got_error(GOT_ERR_BAD_OBJ_HDR);
187 
188 	*obj = calloc(1, sizeof(**obj));
189 	if (*obj == NULL)
190 		return got_error_from_errno("calloc");
191 	(*obj)->type = type;
192 	(*obj)->hdrlen = hdrlen;
193 	(*obj)->size = size;
194 	return NULL;
195 }
196 
197 const struct got_error *
198 got_object_read_header(struct got_object **obj, int fd)
199 {
200 	const struct got_error *err;
201 	struct got_inflate_buf zb;
202 	char *buf;
203 	const size_t zbsize = 64;
204 	size_t outlen, totlen;
205 	int nbuf = 1;
206 
207 	*obj = NULL;
208 
209 	buf = malloc(zbsize);
210 	if (buf == NULL)
211 		return got_error_from_errno("malloc");
212 
213 	err = got_inflate_init(&zb, buf, zbsize);
214 	if (err)
215 		return err;
216 
217 	totlen = 0;
218 	do {
219 		err = got_inflate_read_fd(&zb, fd, &outlen);
220 		if (err)
221 			goto done;
222 		if (outlen == 0)
223 			break;
224 		totlen += outlen;
225 		if (memchr(zb.outbuf, '\0', outlen) == NULL) {
226 			char *newbuf;
227 			nbuf++;
228 			newbuf = recallocarray(buf, nbuf - 1, nbuf, zbsize);
229 			if (newbuf == NULL) {
230 				err = got_error_from_errno("recallocarray");
231 				goto done;
232 			}
233 			buf = newbuf;
234 			zb.outbuf = newbuf + totlen;
235 			zb.outlen = (nbuf * zbsize) - totlen;
236 		}
237 	} while (memchr(zb.outbuf, '\0', outlen) == NULL);
238 
239 	err = got_object_parse_header(obj, buf, totlen);
240 done:
241 	free(buf);
242 	got_inflate_end(&zb);
243 	return err;
244 }
245 
246 struct got_commit_object *
247 got_object_commit_alloc_partial(void)
248 {
249 	struct got_commit_object *commit;
250 
251 	commit = calloc(1, sizeof(*commit));
252 	if (commit == NULL)
253 		return NULL;
254 	commit->tree_id = malloc(sizeof(*commit->tree_id));
255 	if (commit->tree_id == NULL) {
256 		free(commit);
257 		return NULL;
258 	}
259 
260 	SIMPLEQ_INIT(&commit->parent_ids);
261 
262 	return commit;
263 }
264 
265 const struct got_error *
266 got_object_commit_add_parent(struct got_commit_object *commit,
267     const char *id_str)
268 {
269 	const struct got_error *err = NULL;
270 	struct got_object_qid *qid;
271 
272 	err = got_object_qid_alloc_partial(&qid);
273 	if (err)
274 		return err;
275 
276 	if (!got_parse_sha1_digest(qid->id->sha1, id_str)) {
277 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
278 		free(qid->id);
279 		free(qid);
280 		return err;
281 	}
282 
283 	SIMPLEQ_INSERT_TAIL(&commit->parent_ids, qid, entry);
284 	commit->nparents++;
285 
286 	return NULL;
287 }
288 
289 static const struct got_error *
290 parse_gmtoff(time_t *gmtoff, const char *tzstr)
291 {
292 	int sign = 1;
293 	const char *p = tzstr;
294 	time_t h, m;
295 
296 	*gmtoff = 0;
297 
298 	if (*p == '-')
299 		sign = -1;
300 	else if (*p != '+')
301 		return got_error(GOT_ERR_BAD_OBJ_DATA);
302 	p++;
303 	if (!isdigit(*p) && !isdigit(*(p + 1)))
304 		return got_error(GOT_ERR_BAD_OBJ_DATA);
305 	h = (((*p - '0') * 10) + (*(p + 1) - '0'));
306 
307 	p += 2;
308 	if (!isdigit(*p) && !isdigit(*(p + 1)))
309 		return got_error(GOT_ERR_BAD_OBJ_DATA);
310 	m = ((*p - '0') * 10) + (*(p + 1) - '0');
311 
312 	*gmtoff = (h * 60 * 60 + m * 60) * sign;
313 	return NULL;
314 }
315 
316 static const struct got_error *
317 parse_commit_time(time_t *time, time_t *gmtoff, char *committer)
318 {
319 	const struct got_error *err = NULL;
320 	const char *errstr;
321 	char *space, *tzstr;
322 
323 	/* Parse and strip off trailing timezone indicator string. */
324 	space = strrchr(committer, ' ');
325 	if (space == NULL)
326 		return got_error(GOT_ERR_BAD_OBJ_DATA);
327 	tzstr = strdup(space + 1);
328 	if (tzstr == NULL)
329 		return got_error_from_errno("strdup");
330 	err = parse_gmtoff(gmtoff, tzstr);
331 	free(tzstr);
332 	if (err)
333 		return err;
334 	*space = '\0';
335 
336 	/* Timestamp is separated from committer name + email by space. */
337 	space = strrchr(committer, ' ');
338 	if (space == NULL)
339 		return got_error(GOT_ERR_BAD_OBJ_DATA);
340 
341 	/* Timestamp parsed here is expressed in comitter's local time. */
342 	*time = strtonum(space + 1, 0, INT64_MAX, &errstr);
343 	if (errstr)
344 		return got_error(GOT_ERR_BAD_OBJ_DATA);
345 
346 	/* Express the time stamp in UTC. */
347 	*time -= *gmtoff;
348 
349 	/* Strip off parsed time information, leaving just author and email. */
350 	*space = '\0';
351 
352 	return NULL;
353 }
354 
355 void
356 got_object_commit_close(struct got_commit_object *commit)
357 {
358 	if (commit->refcnt > 0) {
359 		commit->refcnt--;
360 		if (commit->refcnt > 0)
361 			return;
362 	}
363 
364 	got_object_id_queue_free(&commit->parent_ids);
365 	free(commit->tree_id);
366 	free(commit->author);
367 	free(commit->committer);
368 	free(commit->logmsg);
369 	free(commit);
370 }
371 
372 struct got_object_id *
373 got_object_commit_get_tree_id(struct got_commit_object *commit)
374 {
375 	return commit->tree_id;
376 }
377 
378 int
379 got_object_commit_get_nparents(struct got_commit_object *commit)
380 {
381 	return commit->nparents;
382 }
383 
384 const struct got_object_id_queue *
385 got_object_commit_get_parent_ids(struct got_commit_object *commit)
386 {
387 	return &commit->parent_ids;
388 }
389 
390 const char *
391 got_object_commit_get_author(struct got_commit_object *commit)
392 {
393 	return commit->author;
394 }
395 
396 time_t
397 got_object_commit_get_author_time(struct got_commit_object *commit)
398 {
399 	return commit->author_time;
400 }
401 
402 time_t got_object_commit_get_author_gmtoff(struct got_commit_object *commit)
403 {
404 	return commit->author_gmtoff;
405 }
406 
407 const char *
408 got_object_commit_get_committer(struct got_commit_object *commit)
409 {
410 	return commit->committer;
411 }
412 
413 time_t
414 got_object_commit_get_committer_time(struct got_commit_object *commit)
415 {
416 	return commit->committer_time;
417 }
418 
419 time_t
420 got_object_commit_get_committer_gmtoff(struct got_commit_object *commit)
421 {
422 	return commit->committer_gmtoff;
423 }
424 
425 const char *
426 got_object_commit_get_logmsg(struct got_commit_object *commit)
427 {
428 	return commit->logmsg;
429 }
430 
431 const struct got_error *
432 got_object_parse_commit(struct got_commit_object **commit, char *buf,
433     size_t len)
434 {
435 	const struct got_error *err = NULL;
436 	char *s = buf;
437 	size_t label_len;
438 	ssize_t remain = (ssize_t)len;
439 
440 	*commit = got_object_commit_alloc_partial();
441 	if (*commit == NULL)
442 		return got_error_from_errno("got_object_commit_alloc_partial");
443 
444 	label_len = strlen(GOT_COMMIT_LABEL_TREE);
445 	if (strncmp(s, GOT_COMMIT_LABEL_TREE, label_len) == 0) {
446 		remain -= label_len;
447 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
448 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
449 			goto done;
450 		}
451 		s += label_len;
452 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
453 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
454 			goto done;
455 		}
456 		remain -= SHA1_DIGEST_STRING_LENGTH;
457 		s += SHA1_DIGEST_STRING_LENGTH;
458 	} else {
459 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
460 		goto done;
461 	}
462 
463 	label_len = strlen(GOT_COMMIT_LABEL_PARENT);
464 	while (strncmp(s, GOT_COMMIT_LABEL_PARENT, label_len) == 0) {
465 		remain -= label_len;
466 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
467 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
468 			goto done;
469 		}
470 		s += label_len;
471 		err = got_object_commit_add_parent(*commit, s);
472 		if (err)
473 			goto done;
474 
475 		remain -= SHA1_DIGEST_STRING_LENGTH;
476 		s += SHA1_DIGEST_STRING_LENGTH;
477 	}
478 
479 	label_len = strlen(GOT_COMMIT_LABEL_AUTHOR);
480 	if (strncmp(s, GOT_COMMIT_LABEL_AUTHOR, label_len) == 0) {
481 		char *p;
482 		size_t slen;
483 
484 		remain -= label_len;
485 		if (remain <= 0) {
486 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
487 			goto done;
488 		}
489 		s += label_len;
490 		p = memchr(s, '\n', remain);
491 		if (p == NULL) {
492 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
493 			goto done;
494 		}
495 		*p = '\0';
496 		slen = strlen(s);
497 		err = parse_commit_time(&(*commit)->author_time,
498 		    &(*commit)->author_gmtoff, s);
499 		if (err)
500 			goto done;
501 		(*commit)->author = strdup(s);
502 		if ((*commit)->author == NULL) {
503 			err = got_error_from_errno("strdup");
504 			goto done;
505 		}
506 		s += slen + 1;
507 		remain -= slen + 1;
508 	}
509 
510 	label_len = strlen(GOT_COMMIT_LABEL_COMMITTER);
511 	if (strncmp(s, GOT_COMMIT_LABEL_COMMITTER, label_len) == 0) {
512 		char *p;
513 		size_t slen;
514 
515 		remain -= label_len;
516 		if (remain <= 0) {
517 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
518 			goto done;
519 		}
520 		s += label_len;
521 		p = memchr(s, '\n', remain);
522 		if (p == NULL) {
523 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
524 			goto done;
525 		}
526 		*p = '\0';
527 		slen = strlen(s);
528 		err = parse_commit_time(&(*commit)->committer_time,
529 		    &(*commit)->committer_gmtoff, s);
530 		if (err)
531 			goto done;
532 		(*commit)->committer = strdup(s);
533 		if ((*commit)->committer == NULL) {
534 			err = got_error_from_errno("strdup");
535 			goto done;
536 		}
537 		s += slen + 1;
538 		remain -= slen + 1;
539 	}
540 
541 	(*commit)->logmsg = strndup(s, remain);
542 	if ((*commit)->logmsg == NULL) {
543 		err = got_error_from_errno("strndup");
544 		goto done;
545 	}
546 done:
547 	if (err) {
548 		got_object_commit_close(*commit);
549 		*commit = NULL;
550 	}
551 	return err;
552 }
553 
554 void
555 got_object_tree_entry_close(struct got_tree_entry *te)
556 {
557 	free(te->id);
558 	free(te->name);
559 	free(te);
560 }
561 
562 void
563 got_object_tree_entries_close(struct got_tree_entries *entries)
564 {
565 	struct got_tree_entry *te;
566 
567 	while (!SIMPLEQ_EMPTY(&entries->head)) {
568 		te = SIMPLEQ_FIRST(&entries->head);
569 		SIMPLEQ_REMOVE_HEAD(&entries->head, entry);
570 		got_object_tree_entry_close(te);
571 	}
572 }
573 
574 void
575 got_object_tree_close(struct got_tree_object *tree)
576 {
577 	if (tree->refcnt > 0) {
578 		tree->refcnt--;
579 		if (tree->refcnt > 0)
580 			return;
581 	}
582 
583 	got_object_tree_entries_close(&tree->entries);
584 	free(tree);
585 }
586 
587 struct got_tree_entry *
588 got_alloc_tree_entry_partial(void)
589 {
590 	struct got_tree_entry *te;
591 
592 	te = malloc(sizeof(*te));
593 	if (te == NULL)
594 		return NULL;
595 
596 	te->id = malloc(sizeof(*te->id));
597 	if (te->id == NULL) {
598 		free(te);
599 		te = NULL;
600 	}
601 	return te;
602 }
603 
604 static const struct got_error *
605 parse_tree_entry(struct got_tree_entry **te, size_t *elen, char *buf,
606     size_t maxlen)
607 {
608 	char *p, *space;
609 	const struct got_error *err = NULL;
610 
611 	*te = got_alloc_tree_entry_partial();
612 	if (*te == NULL)
613 		return got_error_from_errno("got_alloc_tree_entry_partial");
614 
615 	*elen = strnlen(buf, maxlen) + 1;
616 	if (*elen > maxlen) {
617 		free(*te);
618 		*te = NULL;
619 		return got_error(GOT_ERR_BAD_OBJ_DATA);
620 	}
621 
622 	space = memchr(buf, ' ', *elen);
623 	if (space == NULL || space <= buf) {
624 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
625 		free(*te);
626 		*te = NULL;
627 		return err;
628 	}
629 	(*te)->mode = 0;
630 	p = buf;
631 	while (p < space) {
632 		if (*p < '0' && *p > '7') {
633 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
634 			goto done;
635 		}
636 		(*te)->mode <<= 3;
637 		(*te)->mode |= *p - '0';
638 		p++;
639 	}
640 
641 	(*te)->name = strdup(space + 1);
642 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
643 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
644 		goto done;
645 	}
646 	buf += *elen;
647 	memcpy((*te)->id->sha1, buf, SHA1_DIGEST_LENGTH);
648 	*elen += SHA1_DIGEST_LENGTH;
649 done:
650 	if (err) {
651 		got_object_tree_entry_close(*te);
652 		*te = NULL;
653 	}
654 	return err;
655 }
656 
657 const struct got_error *
658 got_object_parse_tree(struct got_tree_object **tree, uint8_t *buf, size_t len)
659 {
660 	const struct got_error *err;
661 	size_t remain = len;
662 	struct got_pathlist_head pathlist;
663 	struct got_pathlist_entry *pe;
664 
665 	TAILQ_INIT(&pathlist);
666 
667 	*tree = calloc(1, sizeof(**tree));
668 	if (*tree == NULL)
669 		return got_error_from_errno("calloc");
670 
671 	SIMPLEQ_INIT(&(*tree)->entries.head);
672 
673 	while (remain > 0) {
674 		struct got_tree_entry *te;
675 		struct got_pathlist_entry *new = NULL;
676 		size_t elen;
677 
678 		err = parse_tree_entry(&te, &elen, buf, remain);
679 		if (err)
680 			goto done;
681 		err = got_pathlist_insert(&new, &pathlist, te->name, te);
682 		if (err)
683 			goto done;
684 		if (new == NULL) {
685 			err = got_error(GOT_ERR_TREE_DUP_ENTRY);
686 			goto done;
687 		}
688 		buf += elen;
689 		remain -= elen;
690 	}
691 
692 	if (remain != 0) {
693 		got_object_tree_close(*tree);
694 		*tree = NULL;
695 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
696 		goto done;
697 	}
698 
699 	TAILQ_FOREACH(pe, &pathlist, entry) {
700 		struct got_tree_entry *te = pe->data;
701 		(*tree)->entries.nentries++;
702 		SIMPLEQ_INSERT_TAIL(&(*tree)->entries.head, te, entry);
703 	}
704 done:
705 	got_pathlist_free(&pathlist);
706 	return err;
707 }
708 
709 void
710 got_object_tag_close(struct got_tag_object *tag)
711 {
712 	free(tag->tag);
713 	free(tag->tagger);
714 	free(tag->tagmsg);
715 	free(tag);
716 }
717 
718 const struct got_error *
719 got_object_parse_tag(struct got_tag_object **tag, uint8_t *buf, size_t len)
720 {
721 	const struct got_error *err = NULL;
722 	size_t remain = len;
723 	char *s = buf;
724 	size_t label_len;
725 
726 	*tag = calloc(1, sizeof(**tag));
727 	if (*tag == NULL)
728 		return got_error_from_errno("calloc");
729 
730 	label_len = strlen(GOT_TAG_LABEL_OBJECT);
731 	if (strncmp(s, GOT_TAG_LABEL_OBJECT, label_len) == 0) {
732 		remain -= label_len;
733 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
734 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
735 			goto done;
736 		}
737 		s += label_len;
738 		if (!got_parse_sha1_digest((*tag)->id.sha1, s)) {
739 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
740 			goto done;
741 		}
742 		remain -= SHA1_DIGEST_STRING_LENGTH;
743 		s += SHA1_DIGEST_STRING_LENGTH;
744 	} else {
745 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
746 		goto done;
747 	}
748 
749 	if (remain <= 0) {
750 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
751 		goto done;
752 	}
753 
754 	label_len = strlen(GOT_TAG_LABEL_TYPE);
755 	if (strncmp(s, GOT_TAG_LABEL_TYPE, label_len) == 0) {
756 		remain -= label_len;
757 		if (remain <= 0) {
758 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
759 			goto done;
760 		}
761 		s += label_len;
762 		if (strncmp(s, GOT_OBJ_LABEL_COMMIT,
763 		    strlen(GOT_OBJ_LABEL_COMMIT)) == 0) {
764 			(*tag)->obj_type = GOT_OBJ_TYPE_COMMIT;
765 			label_len = strlen(GOT_OBJ_LABEL_COMMIT);
766 			s += label_len;
767 			remain -= label_len;
768 		} else if (strncmp(s, GOT_OBJ_LABEL_TREE,
769 		    strlen(GOT_OBJ_LABEL_TREE)) == 0) {
770 			(*tag)->obj_type = GOT_OBJ_TYPE_TREE;
771 			label_len = strlen(GOT_OBJ_LABEL_TREE);
772 			s += label_len;
773 			remain -= label_len;
774 		} else if (strncmp(s, GOT_OBJ_LABEL_BLOB,
775 		    strlen(GOT_OBJ_LABEL_BLOB)) == 0) {
776 			(*tag)->obj_type = GOT_OBJ_TYPE_BLOB;
777 			label_len = strlen(GOT_OBJ_LABEL_BLOB);
778 			s += label_len;
779 			remain -= label_len;
780 		} else if (strncmp(s, GOT_OBJ_LABEL_TAG,
781 		    strlen(GOT_OBJ_LABEL_TAG)) == 0) {
782 			(*tag)->obj_type = GOT_OBJ_TYPE_TAG;
783 			label_len = strlen(GOT_OBJ_LABEL_TAG);
784 			s += label_len;
785 			remain -= label_len;
786 		} else {
787 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
788 			goto done;
789 		}
790 
791 		if (remain <= 0 || *s != '\n') {
792 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
793 			goto done;
794 		}
795 		s++;
796 		remain--;
797 		if (remain <= 0) {
798 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
799 			goto done;
800 		}
801 	} else {
802 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
803 		goto done;
804 	}
805 
806 	label_len = strlen(GOT_TAG_LABEL_TAG);
807 	if (strncmp(s, GOT_TAG_LABEL_TAG, label_len) == 0) {
808 		char *p;
809 		size_t slen;
810 		remain -= label_len;
811 		if (remain <= 0) {
812 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
813 			goto done;
814 		}
815 		s += label_len;
816 		p = memchr(s, '\n', remain);
817 		if (p == NULL) {
818 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
819 			goto done;
820 		}
821 		*p = '\0';
822 		slen = strlen(s);
823 		(*tag)->tag = strndup(s, slen);
824 		if ((*tag)->tag == NULL) {
825 			err = got_error_from_errno("strndup");
826 			goto done;
827 		}
828 		s += slen + 1;
829 		remain -= slen + 1;
830 		if (remain <= 0) {
831 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
832 			goto done;
833 		}
834 	} else {
835 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
836 		goto done;
837 	}
838 
839 	label_len = strlen(GOT_TAG_LABEL_TAGGER);
840 	if (strncmp(s, GOT_TAG_LABEL_TAGGER, label_len) == 0) {
841 		char *p;
842 		size_t slen;
843 
844 		remain -= label_len;
845 		if (remain <= 0) {
846 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
847 			goto done;
848 		}
849 		s += label_len;
850 		p = memchr(s, '\n', remain);
851 		if (p == NULL) {
852 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
853 			goto done;
854 		}
855 		*p = '\0';
856 		slen = strlen(s);
857 		err = parse_commit_time(&(*tag)->tagger_time,
858 		    &(*tag)->tagger_gmtoff, s);
859 		if (err)
860 			goto done;
861 		(*tag)->tagger = strdup(s);
862 		if ((*tag)->tagger == NULL) {
863 			err = got_error_from_errno("strdup");
864 			goto done;
865 		}
866 		s += slen + 1;
867 		remain -= slen + 1;
868 		if (remain <= 0) {
869 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
870 			goto done;
871 		}
872 	} else {
873 		/* Some old tags in the Linux git repo have no tagger. */
874 		(*tag)->tagger = strdup("");
875 		if ((*tag)->tagger == NULL) {
876 			err = got_error_from_errno("strdup");
877 			goto done;
878 		}
879 	}
880 
881 	(*tag)->tagmsg = strndup(s, remain);
882 	if ((*tag)->tagmsg == NULL) {
883 		err = got_error_from_errno("strndup");
884 		goto done;
885 	}
886 done:
887 	if (err) {
888 		got_object_tag_close(*tag);
889 		*tag = NULL;
890 	}
891 	return err;
892 }
893 
894 const struct got_error *
895 got_read_file_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
896 {
897 	const struct got_error *err = NULL;
898 	static const size_t blocksize = 512;
899 	size_t n, total, remain;
900 	uint8_t *buf;
901 
902 	*outbuf = NULL;
903 	*outlen = 0;
904 
905 	buf = malloc(blocksize);
906 	if (buf == NULL)
907 		return got_error_from_errno("malloc");
908 
909 	remain = blocksize;
910 	total = 0;
911 	for (;;) {
912 		if (remain == 0) {
913 			uint8_t *newbuf;
914 			newbuf = reallocarray(buf, 1, total + blocksize);
915 			if (newbuf == NULL) {
916 				err = got_error_from_errno("reallocarray");
917 				goto done;
918 			}
919 			buf = newbuf;
920 			remain += blocksize;
921 		}
922 		n = fread(buf + total, 1, remain, f);
923 		if (n == 0) {
924 			if (ferror(f)) {
925 				err = got_ferror(f, GOT_ERR_IO);
926 				goto done;
927 			}
928 			break; /* EOF */
929 		}
930 		remain -= n;
931 		total += n;
932 	};
933 
934 done:
935 	if (err == NULL) {
936 		*outbuf = buf;
937 		*outlen = total;
938 	} else
939 		free(buf);
940 	return err;
941 }