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Date:: Thu Feb 4 11:11:25 2021 UTC
Message:: tolerate tag objects which lack tagger timestamp information Fixes interop with repos such as git://github.com/steveicarus/iverilog.git Found by + ok naddy
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1 /*
2  * Copyright (c) 2018, 2019, 2020 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/wait.h>
23 
24 #include <errno.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <stdint.h>
29 #include <sha1.h>
30 #include <zlib.h>
31 #include <ctype.h>
32 #include <limits.h>
33 #include <imsg.h>
34 #include <time.h>
35 #include <unistd.h>
36 
37 #include "got_error.h"
38 #include "got_object.h"
39 #include "got_repository.h"
40 #include "got_opentemp.h"
41 #include "got_path.h"
42 
43 #include "got_lib_sha1.h"
44 #include "got_lib_delta.h"
45 #include "got_lib_inflate.h"
46 #include "got_lib_object.h"
47 #include "got_lib_object_parse.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 struct got_object_id *
58 got_object_id_dup(struct got_object_id *id1)
59 {
60 	struct got_object_id *id2;
61 
62 	id2 = malloc(sizeof(*id2));
63 	if (id2 == NULL)
64 		return NULL;
65 	memcpy(id2, id1, sizeof(*id2));
66 	return id2;
67 }
68 
69 int
70 got_object_id_cmp(const struct got_object_id *id1,
71     const struct got_object_id *id2)
72 {
73 	return memcmp(id1->sha1, id2->sha1, SHA1_DIGEST_LENGTH);
74 }
75 
76 const struct got_error *
77 got_object_qid_alloc_partial(struct got_object_qid **qid)
78 {
79 	const struct got_error *err = NULL;
80 
81 	*qid = malloc(sizeof(**qid));
82 	if (*qid == NULL)
83 		return got_error_from_errno("malloc");
84 
85 	(*qid)->id = malloc(sizeof(*((*qid)->id)));
86 	if ((*qid)->id == NULL) {
87 		err = got_error_from_errno("malloc");
88 		got_object_qid_free(*qid);
89 		*qid = NULL;
90 		return err;
91 	}
92 
93 	return NULL;
94 }
95 
96 const struct got_error *
97 got_object_id_str(char **outbuf, struct got_object_id *id)
98 {
99 	static const size_t len = SHA1_DIGEST_STRING_LENGTH;
100 
101 	*outbuf = malloc(len);
102 	if (*outbuf == NULL)
103 		return got_error_from_errno("malloc");
104 
105 	if (got_sha1_digest_to_str(id->sha1, *outbuf, len) == NULL) {
106 		free(*outbuf);
107 		*outbuf = NULL;
108 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
109 	}
110 
111 	return NULL;
112 }
113 
114 void
115 got_object_close(struct got_object *obj)
116 {
117 	if (obj->refcnt > 0) {
118 		obj->refcnt--;
119 		if (obj->refcnt > 0)
120 			return;
121 	}
122 
123 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
124 		struct got_delta *delta;
125 		while (!SIMPLEQ_EMPTY(&obj->deltas.entries)) {
126 			delta = SIMPLEQ_FIRST(&obj->deltas.entries);
127 			SIMPLEQ_REMOVE_HEAD(&obj->deltas.entries, entry);
128 			free(delta);
129 		}
130 	}
131 	free(obj);
132 }
133 
134 void
135 got_object_qid_free(struct got_object_qid *qid)
136 {
137 	free(qid->id);
138 	free(qid);
139 }
140 
141 void
142 got_object_id_queue_free(struct got_object_id_queue *ids)
143 {
144 	struct got_object_qid *qid;
145 
146 	while (!SIMPLEQ_EMPTY(ids)) {
147 		qid = SIMPLEQ_FIRST(ids);
148 		SIMPLEQ_REMOVE_HEAD(ids, entry);
149 		got_object_qid_free(qid);
150 	}
151 }
152 
153 const struct got_error *
154 got_object_parse_header(struct got_object **obj, char *buf, size_t len)
155 {
156 	const char *obj_labels[] = {
157 		GOT_OBJ_LABEL_COMMIT,
158 		GOT_OBJ_LABEL_TREE,
159 		GOT_OBJ_LABEL_BLOB,
160 		GOT_OBJ_LABEL_TAG,
161 	};
162 	const int obj_types[] = {
163 		GOT_OBJ_TYPE_COMMIT,
164 		GOT_OBJ_TYPE_TREE,
165 		GOT_OBJ_TYPE_BLOB,
166 		GOT_OBJ_TYPE_TAG,
167 	};
168 	int type = 0;
169 	size_t size = 0, hdrlen = 0;
170 	size_t i;
171 
172 	*obj = NULL;
173 
174 	hdrlen = strnlen(buf, len) + 1 /* '\0' */;
175 	if (hdrlen > len)
176 		return got_error(GOT_ERR_BAD_OBJ_HDR);
177 
178 	for (i = 0; i < nitems(obj_labels); i++) {
179 		const char *label = obj_labels[i];
180 		size_t label_len = strlen(label);
181 		const char *errstr;
182 
183 		if (strncmp(buf, label, label_len) != 0)
184 			continue;
185 
186 		type = obj_types[i];
187 		if (len <= label_len)
188 			return got_error(GOT_ERR_BAD_OBJ_HDR);
189 		size = strtonum(buf + label_len, 0, LONG_MAX, &errstr);
190 		if (errstr != NULL)
191 			return got_error(GOT_ERR_BAD_OBJ_HDR);
192 		break;
193 	}
194 
195 	if (type == 0)
196 		return got_error(GOT_ERR_BAD_OBJ_HDR);
197 
198 	*obj = calloc(1, sizeof(**obj));
199 	if (*obj == NULL)
200 		return got_error_from_errno("calloc");
201 	(*obj)->type = type;
202 	(*obj)->hdrlen = hdrlen;
203 	(*obj)->size = size;
204 	return NULL;
205 }
206 
207 const struct got_error *
208 got_object_read_header(struct got_object **obj, int fd)
209 {
210 	const struct got_error *err;
211 	struct got_inflate_buf zb;
212 	char *buf;
213 	const size_t zbsize = 64;
214 	size_t outlen, totlen;
215 	int nbuf = 1;
216 
217 	*obj = NULL;
218 
219 	buf = malloc(zbsize);
220 	if (buf == NULL)
221 		return got_error_from_errno("malloc");
222 
223 	err = got_inflate_init(&zb, buf, zbsize, NULL);
224 	if (err)
225 		return err;
226 
227 	totlen = 0;
228 	do {
229 		err = got_inflate_read_fd(&zb, fd, &outlen, NULL);
230 		if (err)
231 			goto done;
232 		if (outlen == 0)
233 			break;
234 		totlen += outlen;
235 		if (memchr(zb.outbuf, '\0', outlen) == NULL) {
236 			char *newbuf;
237 			nbuf++;
238 			newbuf = recallocarray(buf, nbuf - 1, nbuf, zbsize);
239 			if (newbuf == NULL) {
240 				err = got_error_from_errno("recallocarray");
241 				goto done;
242 			}
243 			buf = newbuf;
244 			zb.outbuf = newbuf + totlen;
245 			zb.outlen = (nbuf * zbsize) - totlen;
246 		}
247 	} while (memchr(zb.outbuf, '\0', outlen) == NULL);
248 
249 	err = got_object_parse_header(obj, buf, totlen);
250 done:
251 	free(buf);
252 	got_inflate_end(&zb);
253 	return err;
254 }
255 
256 struct got_commit_object *
257 got_object_commit_alloc_partial(void)
258 {
259 	struct got_commit_object *commit;
260 
261 	commit = calloc(1, sizeof(*commit));
262 	if (commit == NULL)
263 		return NULL;
264 	commit->tree_id = malloc(sizeof(*commit->tree_id));
265 	if (commit->tree_id == NULL) {
266 		free(commit);
267 		return NULL;
268 	}
269 
270 	SIMPLEQ_INIT(&commit->parent_ids);
271 
272 	return commit;
273 }
274 
275 const struct got_error *
276 got_object_commit_add_parent(struct got_commit_object *commit,
277     const char *id_str)
278 {
279 	const struct got_error *err = NULL;
280 	struct got_object_qid *qid;
281 
282 	err = got_object_qid_alloc_partial(&qid);
283 	if (err)
284 		return err;
285 
286 	if (!got_parse_sha1_digest(qid->id->sha1, id_str)) {
287 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
288 		got_object_qid_free(qid);
289 		return err;
290 	}
291 
292 	SIMPLEQ_INSERT_TAIL(&commit->parent_ids, qid, entry);
293 	commit->nparents++;
294 
295 	return NULL;
296 }
297 
298 static const struct got_error *
299 parse_gmtoff(time_t *gmtoff, const char *tzstr)
300 {
301 	int sign = 1;
302 	const char *p = tzstr;
303 	time_t h, m;
304 
305 	*gmtoff = 0;
306 
307 	if (*p == '-')
308 		sign = -1;
309 	else if (*p != '+')
310 		return got_error(GOT_ERR_BAD_OBJ_DATA);
311 	p++;
312 	if (!isdigit(*p) && !isdigit(*(p + 1)))
313 		return got_error(GOT_ERR_BAD_OBJ_DATA);
314 	h = (((*p - '0') * 10) + (*(p + 1) - '0'));
315 
316 	p += 2;
317 	if (!isdigit(*p) && !isdigit(*(p + 1)))
318 		return got_error(GOT_ERR_BAD_OBJ_DATA);
319 	m = ((*p - '0') * 10) + (*(p + 1) - '0');
320 
321 	*gmtoff = (h * 60 * 60 + m * 60) * sign;
322 	return NULL;
323 }
324 
325 static const struct got_error *
326 parse_commit_time(time_t *time, time_t *gmtoff, char *committer)
327 {
328 	const struct got_error *err = NULL;
329 	const char *errstr;
330 	char *space, *tzstr;
331 
332 	/* Parse and strip off trailing timezone indicator string. */
333 	space = strrchr(committer, ' ');
334 	if (space == NULL)
335 		return got_error(GOT_ERR_BAD_OBJ_DATA);
336 	tzstr = strdup(space + 1);
337 	if (tzstr == NULL)
338 		return got_error_from_errno("strdup");
339 	err = parse_gmtoff(gmtoff, tzstr);
340 	free(tzstr);
341 	if (err) { 
342 		if (err->code != GOT_ERR_BAD_OBJ_DATA)
343 			return err;
344 		/* Old versions of Git omitted the timestamp. */
345 		*time = 0;
346 		*gmtoff = 0;
347 		return NULL;
348 	}
349 	*space = '\0';
350 
351 	/* Timestamp is separated from committer name + email by space. */
352 	space = strrchr(committer, ' ');
353 	if (space == NULL)
354 		return got_error(GOT_ERR_BAD_OBJ_DATA);
355 
356 	/* Timestamp parsed here is expressed as UNIX timestamp (UTC). */
357 	*time = strtonum(space + 1, 0, INT64_MAX, &errstr);
358 	if (errstr)
359 		return got_error(GOT_ERR_BAD_OBJ_DATA);
360 
361 	/* Strip off parsed time information, leaving just author and email. */
362 	*space = '\0';
363 
364 	return NULL;
365 }
366 
367 void
368 got_object_commit_close(struct got_commit_object *commit)
369 {
370 	if (commit->refcnt > 0) {
371 		commit->refcnt--;
372 		if (commit->refcnt > 0)
373 			return;
374 	}
375 
376 	got_object_id_queue_free(&commit->parent_ids);
377 	free(commit->tree_id);
378 	free(commit->author);
379 	free(commit->committer);
380 	free(commit->logmsg);
381 	free(commit);
382 }
383 
384 struct got_object_id *
385 got_object_commit_get_tree_id(struct got_commit_object *commit)
386 {
387 	return commit->tree_id;
388 }
389 
390 int
391 got_object_commit_get_nparents(struct got_commit_object *commit)
392 {
393 	return commit->nparents;
394 }
395 
396 const struct got_object_id_queue *
397 got_object_commit_get_parent_ids(struct got_commit_object *commit)
398 {
399 	return &commit->parent_ids;
400 }
401 
402 const char *
403 got_object_commit_get_author(struct got_commit_object *commit)
404 {
405 	return commit->author;
406 }
407 
408 time_t
409 got_object_commit_get_author_time(struct got_commit_object *commit)
410 {
411 	return commit->author_time;
412 }
413 
414 time_t got_object_commit_get_author_gmtoff(struct got_commit_object *commit)
415 {
416 	return commit->author_gmtoff;
417 }
418 
419 const char *
420 got_object_commit_get_committer(struct got_commit_object *commit)
421 {
422 	return commit->committer;
423 }
424 
425 time_t
426 got_object_commit_get_committer_time(struct got_commit_object *commit)
427 {
428 	return commit->committer_time;
429 }
430 
431 time_t
432 got_object_commit_get_committer_gmtoff(struct got_commit_object *commit)
433 {
434 	return commit->committer_gmtoff;
435 }
436 
437 const struct got_error *
438 got_object_commit_get_logmsg(char **logmsg, struct got_commit_object *commit)
439 {
440 	const struct got_error *err = NULL;
441 	char *msg0, *msg, *line, *s;
442 	size_t len;
443 	int headers = 1;
444 
445 	*logmsg = NULL;
446 
447 	msg0 = strdup(commit->logmsg);
448 	if (msg0 == NULL)
449 		return got_error_from_errno("strdup");
450 
451 	/* Copy log message line by line to strip out unusual headers... */
452 	msg = msg0;
453 	do {
454 		if ((line = strsep(&msg, "\n")) == NULL)
455 			break;
456 
457 		if (headers == 1) {
458 			if (line[0] != '\0' &&
459 			    strncmp(line, GOT_COMMIT_LABEL_TREE,
460 			        strlen(GOT_COMMIT_LABEL_TREE)) != 0 &&
461 			    strncmp(line, GOT_COMMIT_LABEL_AUTHOR,
462 			        strlen(GOT_COMMIT_LABEL_AUTHOR)) != 0 &&
463 			    strncmp(line, GOT_COMMIT_LABEL_PARENT,
464 			        strlen(GOT_COMMIT_LABEL_PARENT)) != 0 &&
465 			    strncmp(line, GOT_COMMIT_LABEL_COMMITTER,
466 			        strlen(GOT_COMMIT_LABEL_COMMITTER)) != 0)
467 				continue;
468 
469 			if (line[0] == '\0')
470 				headers = 0;
471 		}
472 
473 		if (asprintf(&s, "%s%s\n",
474 		    *logmsg ? *logmsg : "", line) == -1) {
475 			err = got_error_from_errno("asprintf");
476 			goto done;
477 		}
478 		free(*logmsg);
479 		*logmsg = s;
480 
481 	} while (line);
482 
483 	if (*logmsg == NULL) {
484 		/* log message does not contain \n */
485 		*logmsg = strdup(commit->logmsg);
486 		if (*logmsg == NULL) {
487 			err = got_error_from_errno("strdup");
488 			goto done;
489 		}
490 	}
491 
492 	/* Trim redundant trailing whitespace. */
493 	len = strlen(*logmsg);
494 	while (len > 1 && isspace((unsigned char)(*logmsg)[len - 2]) &&
495 	    isspace((unsigned char)(*logmsg)[len - 1])) {
496 		(*logmsg)[len - 1] = '\0';
497 		len--;
498 	}
499 done:
500 	free(msg0);
501 	if (err) {
502 		free(*logmsg);
503 		*logmsg = NULL;
504 	}
505 	return err;
506 }
507 
508 const char *
509 got_object_commit_get_logmsg_raw(struct got_commit_object *commit)
510 {
511 	return commit->logmsg;
512 }
513 
514 const struct got_error *
515 got_object_parse_commit(struct got_commit_object **commit, char *buf,
516     size_t len)
517 {
518 	const struct got_error *err = NULL;
519 	char *s = buf;
520 	size_t label_len;
521 	ssize_t remain = (ssize_t)len;
522 
523 	if (remain == 0)
524 		return got_error(GOT_ERR_BAD_OBJ_DATA);
525 
526 	*commit = got_object_commit_alloc_partial();
527 	if (*commit == NULL)
528 		return got_error_from_errno("got_object_commit_alloc_partial");
529 
530 	label_len = strlen(GOT_COMMIT_LABEL_TREE);
531 	if (strncmp(s, GOT_COMMIT_LABEL_TREE, label_len) == 0) {
532 		remain -= label_len;
533 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
534 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
535 			goto done;
536 		}
537 		s += label_len;
538 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
539 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
540 			goto done;
541 		}
542 		remain -= SHA1_DIGEST_STRING_LENGTH;
543 		s += SHA1_DIGEST_STRING_LENGTH;
544 	} else {
545 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
546 		goto done;
547 	}
548 
549 	label_len = strlen(GOT_COMMIT_LABEL_PARENT);
550 	while (strncmp(s, GOT_COMMIT_LABEL_PARENT, label_len) == 0) {
551 		remain -= label_len;
552 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
553 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
554 			goto done;
555 		}
556 		s += label_len;
557 		err = got_object_commit_add_parent(*commit, s);
558 		if (err)
559 			goto done;
560 
561 		remain -= SHA1_DIGEST_STRING_LENGTH;
562 		s += SHA1_DIGEST_STRING_LENGTH;
563 	}
564 
565 	label_len = strlen(GOT_COMMIT_LABEL_AUTHOR);
566 	if (strncmp(s, GOT_COMMIT_LABEL_AUTHOR, label_len) == 0) {
567 		char *p;
568 		size_t slen;
569 
570 		remain -= label_len;
571 		if (remain <= 0) {
572 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
573 			goto done;
574 		}
575 		s += label_len;
576 		p = memchr(s, '\n', remain);
577 		if (p == NULL) {
578 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
579 			goto done;
580 		}
581 		*p = '\0';
582 		slen = strlen(s);
583 		err = parse_commit_time(&(*commit)->author_time,
584 		    &(*commit)->author_gmtoff, s);
585 		if (err)
586 			goto done;
587 		(*commit)->author = strdup(s);
588 		if ((*commit)->author == NULL) {
589 			err = got_error_from_errno("strdup");
590 			goto done;
591 		}
592 		s += slen + 1;
593 		remain -= slen + 1;
594 	}
595 
596 	label_len = strlen(GOT_COMMIT_LABEL_COMMITTER);
597 	if (strncmp(s, GOT_COMMIT_LABEL_COMMITTER, label_len) == 0) {
598 		char *p;
599 		size_t slen;
600 
601 		remain -= label_len;
602 		if (remain <= 0) {
603 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
604 			goto done;
605 		}
606 		s += label_len;
607 		p = memchr(s, '\n', remain);
608 		if (p == NULL) {
609 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
610 			goto done;
611 		}
612 		*p = '\0';
613 		slen = strlen(s);
614 		err = parse_commit_time(&(*commit)->committer_time,
615 		    &(*commit)->committer_gmtoff, s);
616 		if (err)
617 			goto done;
618 		(*commit)->committer = strdup(s);
619 		if ((*commit)->committer == NULL) {
620 			err = got_error_from_errno("strdup");
621 			goto done;
622 		}
623 		s += slen + 1;
624 		remain -= slen + 1;
625 	}
626 
627 	(*commit)->logmsg = strndup(s, remain);
628 	if ((*commit)->logmsg == NULL) {
629 		err = got_error_from_errno("strndup");
630 		goto done;
631 	}
632 done:
633 	if (err) {
634 		got_object_commit_close(*commit);
635 		*commit = NULL;
636 	}
637 	return err;
638 }
639 
640 void
641 got_object_tree_close(struct got_tree_object *tree)
642 {
643 	if (tree->refcnt > 0) {
644 		tree->refcnt--;
645 		if (tree->refcnt > 0)
646 			return;
647 	}
648 
649 	free(tree->entries);
650 	free(tree);
651 }
652 
653 static const struct got_error *
654 parse_tree_entry(struct got_parsed_tree_entry **pte, const char **name,
655     size_t *elen, char *buf,
656     size_t maxlen)
657 {
658 	char *p, *space;
659 	const struct got_error *err = NULL;
660 
661 	*name = NULL;
662 	*elen = 0;
663 
664 	*pte = malloc(sizeof(**pte));
665 	if (*pte == NULL)
666 		return got_error_from_errno("malloc");
667 
668 	*elen = strnlen(buf, maxlen) + 1;
669 	if (*elen > maxlen) {
670 		free(*pte);
671 		*pte = NULL;
672 		return got_error(GOT_ERR_BAD_OBJ_DATA);
673 	}
674 
675 	space = memchr(buf, ' ', *elen);
676 	if (space == NULL || space <= buf) {
677 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
678 		free(*pte);
679 		*pte = NULL;
680 		return err;
681 	}
682 	(*pte)->mode = 0;
683 	p = buf;
684 	while (p < space) {
685 		if (*p < '0' && *p > '7') {
686 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
687 			goto done;
688 		}
689 		(*pte)->mode <<= 3;
690 		(*pte)->mode |= *p - '0';
691 		p++;
692 	}
693 
694 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
695 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
696 		goto done;
697 	}
698 	*name = space + 1;
699 	buf += *elen;
700 	(*pte)->id = buf;
701 	*elen += SHA1_DIGEST_LENGTH;
702 done:
703 	if (err) {
704 		free(*pte);
705 		*pte = NULL;
706 	}
707 	return err;
708 }
709 
710 const struct got_error *
711 got_object_parse_tree(struct got_pathlist_head *entries, int *nentries,
712     uint8_t *buf, size_t len)
713 {
714 	const struct got_error *err = NULL;
715 	size_t remain = len;
716 
717 	*nentries = 0;
718 	if (remain == 0)
719 		return NULL; /* tree is empty */
720 
721 	while (remain > 0) {
722 		struct got_parsed_tree_entry *pte;
723 		struct got_pathlist_entry *new = NULL;
724 		const char *name;
725 		size_t elen;
726 
727 		err = parse_tree_entry(&pte, &name, &elen, buf, remain);
728 		if (err)
729 			goto done;
730 		err = got_pathlist_insert(&new, entries, name, pte);
731 		if (err)
732 			goto done;
733 		if (new == NULL) {
734 			err = got_error(GOT_ERR_TREE_DUP_ENTRY);
735 			goto done;
736 		}
737 		buf += elen;
738 		remain -= elen;
739 		(*nentries)++;
740 	}
741 
742 	if (remain != 0) {
743 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
744 		goto done;
745 	}
746 done:
747 	if (err) {
748 		got_object_parsed_tree_entries_free(entries);
749 		*nentries = 0;
750 	}
751 	return err;
752 }
753 
754 void
755 got_object_parsed_tree_entries_free(struct got_pathlist_head *entries)
756 {
757 	struct got_pathlist_entry *pe;
758 
759 	TAILQ_FOREACH(pe, entries, entry) {
760 		struct got_parsed_tree_entry *pte = pe->data;
761 		free(pte);
762 	}
763 	got_pathlist_free(entries);
764 }
765 
766 void
767 got_object_tag_close(struct got_tag_object *tag)
768 {
769 	if (tag->refcnt > 0) {
770 		tag->refcnt--;
771 		if (tag->refcnt > 0)
772 			return;
773 	}
774 
775 	free(tag->tag);
776 	free(tag->tagger);
777 	free(tag->tagmsg);
778 	free(tag);
779 }
780 
781 const struct got_error *
782 got_object_parse_tag(struct got_tag_object **tag, uint8_t *buf, size_t len)
783 {
784 	const struct got_error *err = NULL;
785 	size_t remain = len;
786 	char *s = buf;
787 	size_t label_len;
788 
789 	if (remain == 0)
790 		return got_error(GOT_ERR_BAD_OBJ_DATA);
791 
792 	*tag = calloc(1, sizeof(**tag));
793 	if (*tag == NULL)
794 		return got_error_from_errno("calloc");
795 
796 	label_len = strlen(GOT_TAG_LABEL_OBJECT);
797 	if (strncmp(s, GOT_TAG_LABEL_OBJECT, label_len) == 0) {
798 		remain -= label_len;
799 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
800 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
801 			goto done;
802 		}
803 		s += label_len;
804 		if (!got_parse_sha1_digest((*tag)->id.sha1, s)) {
805 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
806 			goto done;
807 		}
808 		remain -= SHA1_DIGEST_STRING_LENGTH;
809 		s += SHA1_DIGEST_STRING_LENGTH;
810 	} else {
811 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
812 		goto done;
813 	}
814 
815 	if (remain <= 0) {
816 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
817 		goto done;
818 	}
819 
820 	label_len = strlen(GOT_TAG_LABEL_TYPE);
821 	if (strncmp(s, GOT_TAG_LABEL_TYPE, label_len) == 0) {
822 		remain -= label_len;
823 		if (remain <= 0) {
824 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
825 			goto done;
826 		}
827 		s += label_len;
828 		if (strncmp(s, GOT_OBJ_LABEL_COMMIT,
829 		    strlen(GOT_OBJ_LABEL_COMMIT)) == 0) {
830 			(*tag)->obj_type = GOT_OBJ_TYPE_COMMIT;
831 			label_len = strlen(GOT_OBJ_LABEL_COMMIT);
832 			s += label_len;
833 			remain -= label_len;
834 		} else if (strncmp(s, GOT_OBJ_LABEL_TREE,
835 		    strlen(GOT_OBJ_LABEL_TREE)) == 0) {
836 			(*tag)->obj_type = GOT_OBJ_TYPE_TREE;
837 			label_len = strlen(GOT_OBJ_LABEL_TREE);
838 			s += label_len;
839 			remain -= label_len;
840 		} else if (strncmp(s, GOT_OBJ_LABEL_BLOB,
841 		    strlen(GOT_OBJ_LABEL_BLOB)) == 0) {
842 			(*tag)->obj_type = GOT_OBJ_TYPE_BLOB;
843 			label_len = strlen(GOT_OBJ_LABEL_BLOB);
844 			s += label_len;
845 			remain -= label_len;
846 		} else if (strncmp(s, GOT_OBJ_LABEL_TAG,
847 		    strlen(GOT_OBJ_LABEL_TAG)) == 0) {
848 			(*tag)->obj_type = GOT_OBJ_TYPE_TAG;
849 			label_len = strlen(GOT_OBJ_LABEL_TAG);
850 			s += label_len;
851 			remain -= label_len;
852 		} else {
853 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
854 			goto done;
855 		}
856 
857 		if (remain <= 0 || *s != '\n') {
858 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
859 			goto done;
860 		}
861 		s++;
862 		remain--;
863 		if (remain <= 0) {
864 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
865 			goto done;
866 		}
867 	} else {
868 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
869 		goto done;
870 	}
871 
872 	label_len = strlen(GOT_TAG_LABEL_TAG);
873 	if (strncmp(s, GOT_TAG_LABEL_TAG, label_len) == 0) {
874 		char *p;
875 		size_t slen;
876 		remain -= label_len;
877 		if (remain <= 0) {
878 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
879 			goto done;
880 		}
881 		s += label_len;
882 		p = memchr(s, '\n', remain);
883 		if (p == NULL) {
884 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
885 			goto done;
886 		}
887 		*p = '\0';
888 		slen = strlen(s);
889 		(*tag)->tag = strndup(s, slen);
890 		if ((*tag)->tag == NULL) {
891 			err = got_error_from_errno("strndup");
892 			goto done;
893 		}
894 		s += slen + 1;
895 		remain -= slen + 1;
896 		if (remain <= 0) {
897 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
898 			goto done;
899 		}
900 	} else {
901 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
902 		goto done;
903 	}
904 
905 	label_len = strlen(GOT_TAG_LABEL_TAGGER);
906 	if (strncmp(s, GOT_TAG_LABEL_TAGGER, label_len) == 0) {
907 		char *p;
908 		size_t slen;
909 
910 		remain -= label_len;
911 		if (remain <= 0) {
912 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
913 			goto done;
914 		}
915 		s += label_len;
916 		p = memchr(s, '\n', remain);
917 		if (p == NULL) {
918 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
919 			goto done;
920 		}
921 		*p = '\0';
922 		slen = strlen(s);
923 		err = parse_commit_time(&(*tag)->tagger_time,
924 		    &(*tag)->tagger_gmtoff, s);
925 		if (err)
926 			goto done;
927 		(*tag)->tagger = strdup(s);
928 		if ((*tag)->tagger == NULL) {
929 			err = got_error_from_errno("strdup");
930 			goto done;
931 		}
932 		s += slen + 1;
933 		remain -= slen + 1;
934 		if (remain < 0) {
935 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
936 			goto done;
937 		}
938 	} else {
939 		/* Some old tags in the Linux git repo have no tagger. */
940 		(*tag)->tagger = strdup("");
941 		if ((*tag)->tagger == NULL) {
942 			err = got_error_from_errno("strdup");
943 			goto done;
944 		}
945 	}
946 
947 	(*tag)->tagmsg = strndup(s, remain);
948 	if ((*tag)->tagmsg == NULL) {
949 		err = got_error_from_errno("strndup");
950 		goto done;
951 	}
952 done:
953 	if (err) {
954 		got_object_tag_close(*tag);
955 		*tag = NULL;
956 	}
957 	return err;
958 }
959 
960 const struct got_error *
961 got_read_file_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
962 {
963 	const struct got_error *err = NULL;
964 	static const size_t blocksize = 512;
965 	size_t n, total, remain;
966 	uint8_t *buf;
967 
968 	*outbuf = NULL;
969 	*outlen = 0;
970 
971 	buf = malloc(blocksize);
972 	if (buf == NULL)
973 		return got_error_from_errno("malloc");
974 
975 	remain = blocksize;
976 	total = 0;
977 	for (;;) {
978 		if (remain == 0) {
979 			uint8_t *newbuf;
980 			newbuf = reallocarray(buf, 1, total + blocksize);
981 			if (newbuf == NULL) {
982 				err = got_error_from_errno("reallocarray");
983 				goto done;
984 			}
985 			buf = newbuf;
986 			remain += blocksize;
987 		}
988 		n = fread(buf + total, 1, remain, f);
989 		if (n == 0) {
990 			if (ferror(f)) {
991 				err = got_ferror(f, GOT_ERR_IO);
992 				goto done;
993 			}
994 			break; /* EOF */
995 		}
996 		remain -= n;
997 		total += n;
998 	};
999 
1000 done:
1001 	if (err == NULL) {
1002 		*outbuf = buf;
1003 		*outlen = total;
1004 	} else
1005 		free(buf);
1006 	return err;
1007 }