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Date:: Fri Oct 4 11:13:22 2019 UTC
Message:: handle empty trees during 'import' and 'checkout'; spotted by sthen@
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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 			free(delta->delta_buf);
117 			free(delta);
118 		}
119 	}
120 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
121 		free(obj->path_packfile);
122 	free(obj);
123 }
124 
125 void
126 got_object_qid_free(struct got_object_qid *qid)
127 {
128 	free(qid->id);
129 	free(qid);
130 }
131 
132 void
133 got_object_id_queue_free(struct got_object_id_queue *ids)
134 {
135 	struct got_object_qid *qid;
136 
137 	while (!SIMPLEQ_EMPTY(ids)) {
138 		qid = SIMPLEQ_FIRST(ids);
139 		SIMPLEQ_REMOVE_HEAD(ids, entry);
140 		got_object_qid_free(qid);
141 	}
142 }
143 
144 const struct got_error *
145 got_object_parse_header(struct got_object **obj, char *buf, size_t len)
146 {
147 	const char *obj_labels[] = {
148 		GOT_OBJ_LABEL_COMMIT,
149 		GOT_OBJ_LABEL_TREE,
150 		GOT_OBJ_LABEL_BLOB,
151 		GOT_OBJ_LABEL_TAG,
152 	};
153 	const int obj_types[] = {
154 		GOT_OBJ_TYPE_COMMIT,
155 		GOT_OBJ_TYPE_TREE,
156 		GOT_OBJ_TYPE_BLOB,
157 		GOT_OBJ_TYPE_TAG,
158 	};
159 	int type = 0;
160 	size_t size = 0, hdrlen = 0;
161 	int i;
162 
163 	*obj = NULL;
164 
165 	hdrlen = strnlen(buf, len) + 1 /* '\0' */;
166 	if (hdrlen > len)
167 		return got_error(GOT_ERR_BAD_OBJ_HDR);
168 
169 	for (i = 0; i < nitems(obj_labels); i++) {
170 		const char *label = obj_labels[i];
171 		size_t label_len = strlen(label);
172 		const char *errstr;
173 
174 		if (strncmp(buf, label, label_len) != 0)
175 			continue;
176 
177 		type = obj_types[i];
178 		if (len <= label_len)
179 			return got_error(GOT_ERR_BAD_OBJ_HDR);
180 		size = strtonum(buf + label_len, 0, LONG_MAX, &errstr);
181 		if (errstr != NULL)
182 			return got_error(GOT_ERR_BAD_OBJ_HDR);
183 		break;
184 	}
185 
186 	if (type == 0)
187 		return got_error(GOT_ERR_BAD_OBJ_HDR);
188 
189 	*obj = calloc(1, sizeof(**obj));
190 	if (*obj == NULL)
191 		return got_error_from_errno("calloc");
192 	(*obj)->type = type;
193 	(*obj)->hdrlen = hdrlen;
194 	(*obj)->size = size;
195 	return NULL;
196 }
197 
198 const struct got_error *
199 got_object_read_header(struct got_object **obj, int fd)
200 {
201 	const struct got_error *err;
202 	struct got_inflate_buf zb;
203 	char *buf;
204 	const size_t zbsize = 64;
205 	size_t outlen, totlen;
206 	int nbuf = 1;
207 
208 	*obj = NULL;
209 
210 	buf = malloc(zbsize);
211 	if (buf == NULL)
212 		return got_error_from_errno("malloc");
213 
214 	err = got_inflate_init(&zb, buf, zbsize);
215 	if (err)
216 		return err;
217 
218 	totlen = 0;
219 	do {
220 		err = got_inflate_read_fd(&zb, fd, &outlen);
221 		if (err)
222 			goto done;
223 		if (outlen == 0)
224 			break;
225 		totlen += outlen;
226 		if (memchr(zb.outbuf, '\0', outlen) == NULL) {
227 			char *newbuf;
228 			nbuf++;
229 			newbuf = recallocarray(buf, nbuf - 1, nbuf, zbsize);
230 			if (newbuf == NULL) {
231 				err = got_error_from_errno("recallocarray");
232 				goto done;
233 			}
234 			buf = newbuf;
235 			zb.outbuf = newbuf + totlen;
236 			zb.outlen = (nbuf * zbsize) - totlen;
237 		}
238 	} while (memchr(zb.outbuf, '\0', outlen) == NULL);
239 
240 	err = got_object_parse_header(obj, buf, totlen);
241 done:
242 	free(buf);
243 	got_inflate_end(&zb);
244 	return err;
245 }
246 
247 struct got_commit_object *
248 got_object_commit_alloc_partial(void)
249 {
250 	struct got_commit_object *commit;
251 
252 	commit = calloc(1, sizeof(*commit));
253 	if (commit == NULL)
254 		return NULL;
255 	commit->tree_id = malloc(sizeof(*commit->tree_id));
256 	if (commit->tree_id == NULL) {
257 		free(commit);
258 		return NULL;
259 	}
260 
261 	SIMPLEQ_INIT(&commit->parent_ids);
262 
263 	return commit;
264 }
265 
266 const struct got_error *
267 got_object_commit_add_parent(struct got_commit_object *commit,
268     const char *id_str)
269 {
270 	const struct got_error *err = NULL;
271 	struct got_object_qid *qid;
272 
273 	err = got_object_qid_alloc_partial(&qid);
274 	if (err)
275 		return err;
276 
277 	if (!got_parse_sha1_digest(qid->id->sha1, id_str)) {
278 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
279 		got_object_qid_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 as UNIX timestamp (UTC). */
342 	*time = strtonum(space + 1, 0, INT64_MAX, &errstr);
343 	if (errstr)
344 		return got_error(GOT_ERR_BAD_OBJ_DATA);
345 
346 	/* Strip off parsed time information, leaving just author and email. */
347 	*space = '\0';
348 
349 	return NULL;
350 }
351 
352 void
353 got_object_commit_close(struct got_commit_object *commit)
354 {
355 	if (commit->refcnt > 0) {
356 		commit->refcnt--;
357 		if (commit->refcnt > 0)
358 			return;
359 	}
360 
361 	got_object_id_queue_free(&commit->parent_ids);
362 	free(commit->tree_id);
363 	free(commit->author);
364 	free(commit->committer);
365 	free(commit->logmsg);
366 	free(commit);
367 }
368 
369 struct got_object_id *
370 got_object_commit_get_tree_id(struct got_commit_object *commit)
371 {
372 	return commit->tree_id;
373 }
374 
375 int
376 got_object_commit_get_nparents(struct got_commit_object *commit)
377 {
378 	return commit->nparents;
379 }
380 
381 const struct got_object_id_queue *
382 got_object_commit_get_parent_ids(struct got_commit_object *commit)
383 {
384 	return &commit->parent_ids;
385 }
386 
387 const char *
388 got_object_commit_get_author(struct got_commit_object *commit)
389 {
390 	return commit->author;
391 }
392 
393 time_t
394 got_object_commit_get_author_time(struct got_commit_object *commit)
395 {
396 	return commit->author_time;
397 }
398 
399 time_t got_object_commit_get_author_gmtoff(struct got_commit_object *commit)
400 {
401 	return commit->author_gmtoff;
402 }
403 
404 const char *
405 got_object_commit_get_committer(struct got_commit_object *commit)
406 {
407 	return commit->committer;
408 }
409 
410 time_t
411 got_object_commit_get_committer_time(struct got_commit_object *commit)
412 {
413 	return commit->committer_time;
414 }
415 
416 time_t
417 got_object_commit_get_committer_gmtoff(struct got_commit_object *commit)
418 {
419 	return commit->committer_gmtoff;
420 }
421 
422 const struct got_error *
423 got_object_commit_get_logmsg(char **logmsg, struct got_commit_object *commit)
424 {
425 	const struct got_error *err = NULL;
426 	char *msg0, *msg, *line, *s;
427 	size_t len;
428 	int headers = 1;
429 
430 	*logmsg = NULL;
431 
432 	msg0 = strdup(commit->logmsg);
433 	if (msg0 == NULL)
434 		return got_error_from_errno("strdup");
435 
436 	/* Copy log message line by line to strip out unusual headers... */
437 	msg = msg0;
438 	do {
439 		if ((line = strsep(&msg, "\n")) == NULL)
440 			break;
441 
442 		if (headers == 1) {
443 			if (line[0] != '\0' &&
444 			    strncmp(line, GOT_COMMIT_LABEL_TREE,
445 			        strlen(GOT_COMMIT_LABEL_TREE)) != 0 &&
446 			    strncmp(line, GOT_COMMIT_LABEL_AUTHOR,
447 			        strlen(GOT_COMMIT_LABEL_AUTHOR)) != 0 &&
448 			    strncmp(line, GOT_COMMIT_LABEL_PARENT,
449 			        strlen(GOT_COMMIT_LABEL_PARENT)) != 0 &&
450 			    strncmp(line, GOT_COMMIT_LABEL_COMMITTER,
451 			        strlen(GOT_COMMIT_LABEL_COMMITTER)) != 0)
452 				continue;
453 
454 			if (line[0] == '\0')
455 				headers = 0;
456 		}
457 
458 		if (asprintf(&s, "%s%s\n",
459 		    *logmsg ? *logmsg : "", line) == -1) {
460 			err = got_error_from_errno("asprintf");
461 			goto done;
462 		}
463 		free(*logmsg);
464 		*logmsg = s;
465 
466 	} while (line);
467 
468 	/* Trim redundant trailing whitespace. */
469 	len = strlen(*logmsg);
470 	while (len > 1 && isspace((unsigned char)(*logmsg)[len - 2]) &&
471 	    isspace((unsigned char)(*logmsg)[len - 1])) {
472 		(*logmsg)[len - 1] = '\0';
473 		len--;
474 	}
475 done:
476 	free(msg0);
477 	if (err) {
478 		free(*logmsg);
479 		*logmsg = NULL;
480 	}
481 	return err;
482 }
483 
484 const char *
485 got_object_commit_get_logmsg_raw(struct got_commit_object *commit)
486 {
487 	return commit->logmsg;
488 }
489 
490 const struct got_error *
491 got_object_parse_commit(struct got_commit_object **commit, char *buf,
492     size_t len)
493 {
494 	const struct got_error *err = NULL;
495 	char *s = buf;
496 	size_t label_len;
497 	ssize_t remain = (ssize_t)len;
498 
499 	if (remain == 0)
500 		return got_error(GOT_ERR_BAD_OBJ_DATA);
501 
502 	*commit = got_object_commit_alloc_partial();
503 	if (*commit == NULL)
504 		return got_error_from_errno("got_object_commit_alloc_partial");
505 
506 	label_len = strlen(GOT_COMMIT_LABEL_TREE);
507 	if (strncmp(s, GOT_COMMIT_LABEL_TREE, label_len) == 0) {
508 		remain -= label_len;
509 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
510 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
511 			goto done;
512 		}
513 		s += label_len;
514 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
515 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
516 			goto done;
517 		}
518 		remain -= SHA1_DIGEST_STRING_LENGTH;
519 		s += SHA1_DIGEST_STRING_LENGTH;
520 	} else {
521 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
522 		goto done;
523 	}
524 
525 	label_len = strlen(GOT_COMMIT_LABEL_PARENT);
526 	while (strncmp(s, GOT_COMMIT_LABEL_PARENT, label_len) == 0) {
527 		remain -= label_len;
528 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
529 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
530 			goto done;
531 		}
532 		s += label_len;
533 		err = got_object_commit_add_parent(*commit, s);
534 		if (err)
535 			goto done;
536 
537 		remain -= SHA1_DIGEST_STRING_LENGTH;
538 		s += SHA1_DIGEST_STRING_LENGTH;
539 	}
540 
541 	label_len = strlen(GOT_COMMIT_LABEL_AUTHOR);
542 	if (strncmp(s, GOT_COMMIT_LABEL_AUTHOR, label_len) == 0) {
543 		char *p;
544 		size_t slen;
545 
546 		remain -= label_len;
547 		if (remain <= 0) {
548 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
549 			goto done;
550 		}
551 		s += label_len;
552 		p = memchr(s, '\n', remain);
553 		if (p == NULL) {
554 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
555 			goto done;
556 		}
557 		*p = '\0';
558 		slen = strlen(s);
559 		err = parse_commit_time(&(*commit)->author_time,
560 		    &(*commit)->author_gmtoff, s);
561 		if (err)
562 			goto done;
563 		(*commit)->author = strdup(s);
564 		if ((*commit)->author == NULL) {
565 			err = got_error_from_errno("strdup");
566 			goto done;
567 		}
568 		s += slen + 1;
569 		remain -= slen + 1;
570 	}
571 
572 	label_len = strlen(GOT_COMMIT_LABEL_COMMITTER);
573 	if (strncmp(s, GOT_COMMIT_LABEL_COMMITTER, label_len) == 0) {
574 		char *p;
575 		size_t slen;
576 
577 		remain -= label_len;
578 		if (remain <= 0) {
579 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
580 			goto done;
581 		}
582 		s += label_len;
583 		p = memchr(s, '\n', remain);
584 		if (p == NULL) {
585 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
586 			goto done;
587 		}
588 		*p = '\0';
589 		slen = strlen(s);
590 		err = parse_commit_time(&(*commit)->committer_time,
591 		    &(*commit)->committer_gmtoff, s);
592 		if (err)
593 			goto done;
594 		(*commit)->committer = strdup(s);
595 		if ((*commit)->committer == NULL) {
596 			err = got_error_from_errno("strdup");
597 			goto done;
598 		}
599 		s += slen + 1;
600 		remain -= slen + 1;
601 	}
602 
603 	(*commit)->logmsg = strndup(s, remain);
604 	if ((*commit)->logmsg == NULL) {
605 		err = got_error_from_errno("strndup");
606 		goto done;
607 	}
608 done:
609 	if (err) {
610 		got_object_commit_close(*commit);
611 		*commit = NULL;
612 	}
613 	return err;
614 }
615 
616 void
617 got_object_tree_entry_close(struct got_tree_entry *te)
618 {
619 	free(te->id);
620 	free(te->name);
621 	free(te);
622 }
623 
624 void
625 got_object_tree_entries_close(struct got_tree_entries *entries)
626 {
627 	struct got_tree_entry *te;
628 
629 	while (!SIMPLEQ_EMPTY(&entries->head)) {
630 		te = SIMPLEQ_FIRST(&entries->head);
631 		SIMPLEQ_REMOVE_HEAD(&entries->head, entry);
632 		got_object_tree_entry_close(te);
633 	}
634 }
635 
636 void
637 got_object_tree_close(struct got_tree_object *tree)
638 {
639 	if (tree->refcnt > 0) {
640 		tree->refcnt--;
641 		if (tree->refcnt > 0)
642 			return;
643 	}
644 
645 	got_object_tree_entries_close(&tree->entries);
646 	free(tree);
647 }
648 
649 struct got_tree_entry *
650 got_alloc_tree_entry_partial(void)
651 {
652 	struct got_tree_entry *te;
653 
654 	te = malloc(sizeof(*te));
655 	if (te == NULL)
656 		return NULL;
657 
658 	te->id = malloc(sizeof(*te->id));
659 	if (te->id == NULL) {
660 		free(te);
661 		te = NULL;
662 	}
663 	return te;
664 }
665 
666 static const struct got_error *
667 parse_tree_entry(struct got_tree_entry **te, size_t *elen, char *buf,
668     size_t maxlen)
669 {
670 	char *p, *space;
671 	const struct got_error *err = NULL;
672 
673 	*elen = 0;
674 
675 	*te = got_alloc_tree_entry_partial();
676 	if (*te == NULL)
677 		return got_error_from_errno("got_alloc_tree_entry_partial");
678 
679 	*elen = strnlen(buf, maxlen) + 1;
680 	if (*elen > maxlen) {
681 		free(*te);
682 		*te = NULL;
683 		return got_error(GOT_ERR_BAD_OBJ_DATA);
684 	}
685 
686 	space = memchr(buf, ' ', *elen);
687 	if (space == NULL || space <= buf) {
688 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
689 		free(*te);
690 		*te = NULL;
691 		return err;
692 	}
693 	(*te)->mode = 0;
694 	p = buf;
695 	while (p < space) {
696 		if (*p < '0' && *p > '7') {
697 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
698 			goto done;
699 		}
700 		(*te)->mode <<= 3;
701 		(*te)->mode |= *p - '0';
702 		p++;
703 	}
704 
705 	(*te)->name = strdup(space + 1);
706 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
707 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
708 		goto done;
709 	}
710 	buf += *elen;
711 	memcpy((*te)->id->sha1, buf, SHA1_DIGEST_LENGTH);
712 	*elen += SHA1_DIGEST_LENGTH;
713 done:
714 	if (err) {
715 		got_object_tree_entry_close(*te);
716 		*te = NULL;
717 	}
718 	return err;
719 }
720 
721 const struct got_error *
722 got_object_parse_tree(struct got_tree_object **tree, uint8_t *buf, size_t len)
723 {
724 	const struct got_error *err;
725 	size_t remain = len;
726 	struct got_pathlist_head pathlist;
727 	struct got_pathlist_entry *pe;
728 
729 	TAILQ_INIT(&pathlist);
730 
731 	*tree = calloc(1, sizeof(**tree));
732 	if (*tree == NULL)
733 		return got_error_from_errno("calloc");
734 
735 	SIMPLEQ_INIT(&(*tree)->entries.head);
736 
737 	if (remain == 0)
738 		return NULL; /* tree is empty */
739 
740 	while (remain > 0) {
741 		struct got_tree_entry *te;
742 		struct got_pathlist_entry *new = NULL;
743 		size_t elen;
744 
745 		err = parse_tree_entry(&te, &elen, buf, remain);
746 		if (err)
747 			goto done;
748 		err = got_pathlist_insert(&new, &pathlist, te->name, te);
749 		if (err)
750 			goto done;
751 		if (new == NULL) {
752 			err = got_error(GOT_ERR_TREE_DUP_ENTRY);
753 			goto done;
754 		}
755 		buf += elen;
756 		remain -= elen;
757 	}
758 
759 	if (remain != 0) {
760 		got_object_tree_close(*tree);
761 		*tree = NULL;
762 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
763 		goto done;
764 	}
765 
766 	TAILQ_FOREACH(pe, &pathlist, entry) {
767 		struct got_tree_entry *te = pe->data;
768 		(*tree)->entries.nentries++;
769 		SIMPLEQ_INSERT_TAIL(&(*tree)->entries.head, te, entry);
770 	}
771 done:
772 	got_pathlist_free(&pathlist);
773 	return err;
774 }
775 
776 void
777 got_object_tag_close(struct got_tag_object *tag)
778 {
779 	if (tag->refcnt > 0) {
780 		tag->refcnt--;
781 		if (tag->refcnt > 0)
782 			return;
783 	}
784 
785 	free(tag->tag);
786 	free(tag->tagger);
787 	free(tag->tagmsg);
788 	free(tag);
789 }
790 
791 const struct got_error *
792 got_object_parse_tag(struct got_tag_object **tag, uint8_t *buf, size_t len)
793 {
794 	const struct got_error *err = NULL;
795 	size_t remain = len;
796 	char *s = buf;
797 	size_t label_len;
798 
799 	if (remain == 0)
800 		return got_error(GOT_ERR_BAD_OBJ_DATA);
801 
802 	*tag = calloc(1, sizeof(**tag));
803 	if (*tag == NULL)
804 		return got_error_from_errno("calloc");
805 
806 	label_len = strlen(GOT_TAG_LABEL_OBJECT);
807 	if (strncmp(s, GOT_TAG_LABEL_OBJECT, label_len) == 0) {
808 		remain -= label_len;
809 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
810 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
811 			goto done;
812 		}
813 		s += label_len;
814 		if (!got_parse_sha1_digest((*tag)->id.sha1, s)) {
815 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
816 			goto done;
817 		}
818 		remain -= SHA1_DIGEST_STRING_LENGTH;
819 		s += SHA1_DIGEST_STRING_LENGTH;
820 	} else {
821 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
822 		goto done;
823 	}
824 
825 	if (remain <= 0) {
826 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
827 		goto done;
828 	}
829 
830 	label_len = strlen(GOT_TAG_LABEL_TYPE);
831 	if (strncmp(s, GOT_TAG_LABEL_TYPE, label_len) == 0) {
832 		remain -= label_len;
833 		if (remain <= 0) {
834 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
835 			goto done;
836 		}
837 		s += label_len;
838 		if (strncmp(s, GOT_OBJ_LABEL_COMMIT,
839 		    strlen(GOT_OBJ_LABEL_COMMIT)) == 0) {
840 			(*tag)->obj_type = GOT_OBJ_TYPE_COMMIT;
841 			label_len = strlen(GOT_OBJ_LABEL_COMMIT);
842 			s += label_len;
843 			remain -= label_len;
844 		} else if (strncmp(s, GOT_OBJ_LABEL_TREE,
845 		    strlen(GOT_OBJ_LABEL_TREE)) == 0) {
846 			(*tag)->obj_type = GOT_OBJ_TYPE_TREE;
847 			label_len = strlen(GOT_OBJ_LABEL_TREE);
848 			s += label_len;
849 			remain -= label_len;
850 		} else if (strncmp(s, GOT_OBJ_LABEL_BLOB,
851 		    strlen(GOT_OBJ_LABEL_BLOB)) == 0) {
852 			(*tag)->obj_type = GOT_OBJ_TYPE_BLOB;
853 			label_len = strlen(GOT_OBJ_LABEL_BLOB);
854 			s += label_len;
855 			remain -= label_len;
856 		} else if (strncmp(s, GOT_OBJ_LABEL_TAG,
857 		    strlen(GOT_OBJ_LABEL_TAG)) == 0) {
858 			(*tag)->obj_type = GOT_OBJ_TYPE_TAG;
859 			label_len = strlen(GOT_OBJ_LABEL_TAG);
860 			s += label_len;
861 			remain -= label_len;
862 		} else {
863 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
864 			goto done;
865 		}
866 
867 		if (remain <= 0 || *s != '\n') {
868 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
869 			goto done;
870 		}
871 		s++;
872 		remain--;
873 		if (remain <= 0) {
874 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
875 			goto done;
876 		}
877 	} else {
878 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
879 		goto done;
880 	}
881 
882 	label_len = strlen(GOT_TAG_LABEL_TAG);
883 	if (strncmp(s, GOT_TAG_LABEL_TAG, label_len) == 0) {
884 		char *p;
885 		size_t slen;
886 		remain -= label_len;
887 		if (remain <= 0) {
888 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
889 			goto done;
890 		}
891 		s += label_len;
892 		p = memchr(s, '\n', remain);
893 		if (p == NULL) {
894 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
895 			goto done;
896 		}
897 		*p = '\0';
898 		slen = strlen(s);
899 		(*tag)->tag = strndup(s, slen);
900 		if ((*tag)->tag == NULL) {
901 			err = got_error_from_errno("strndup");
902 			goto done;
903 		}
904 		s += slen + 1;
905 		remain -= slen + 1;
906 		if (remain <= 0) {
907 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
908 			goto done;
909 		}
910 	} else {
911 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
912 		goto done;
913 	}
914 
915 	label_len = strlen(GOT_TAG_LABEL_TAGGER);
916 	if (strncmp(s, GOT_TAG_LABEL_TAGGER, label_len) == 0) {
917 		char *p;
918 		size_t slen;
919 
920 		remain -= label_len;
921 		if (remain <= 0) {
922 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
923 			goto done;
924 		}
925 		s += label_len;
926 		p = memchr(s, '\n', remain);
927 		if (p == NULL) {
928 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
929 			goto done;
930 		}
931 		*p = '\0';
932 		slen = strlen(s);
933 		err = parse_commit_time(&(*tag)->tagger_time,
934 		    &(*tag)->tagger_gmtoff, s);
935 		if (err)
936 			goto done;
937 		(*tag)->tagger = strdup(s);
938 		if ((*tag)->tagger == NULL) {
939 			err = got_error_from_errno("strdup");
940 			goto done;
941 		}
942 		s += slen + 1;
943 		remain -= slen + 1;
944 		if (remain <= 0) {
945 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
946 			goto done;
947 		}
948 	} else {
949 		/* Some old tags in the Linux git repo have no tagger. */
950 		(*tag)->tagger = strdup("");
951 		if ((*tag)->tagger == NULL) {
952 			err = got_error_from_errno("strdup");
953 			goto done;
954 		}
955 	}
956 
957 	(*tag)->tagmsg = strndup(s, remain);
958 	if ((*tag)->tagmsg == NULL) {
959 		err = got_error_from_errno("strndup");
960 		goto done;
961 	}
962 done:
963 	if (err) {
964 		got_object_tag_close(*tag);
965 		*tag = NULL;
966 	}
967 	return err;
968 }
969 
970 const struct got_error *
971 got_read_file_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
972 {
973 	const struct got_error *err = NULL;
974 	static const size_t blocksize = 512;
975 	size_t n, total, remain;
976 	uint8_t *buf;
977 
978 	*outbuf = NULL;
979 	*outlen = 0;
980 
981 	buf = malloc(blocksize);
982 	if (buf == NULL)
983 		return got_error_from_errno("malloc");
984 
985 	remain = blocksize;
986 	total = 0;
987 	for (;;) {
988 		if (remain == 0) {
989 			uint8_t *newbuf;
990 			newbuf = reallocarray(buf, 1, total + blocksize);
991 			if (newbuf == NULL) {
992 				err = got_error_from_errno("reallocarray");
993 				goto done;
994 			}
995 			buf = newbuf;
996 			remain += blocksize;
997 		}
998 		n = fread(buf + total, 1, remain, f);
999 		if (n == 0) {
1000 			if (ferror(f)) {
1001 				err = got_ferror(f, GOT_ERR_IO);
1002 				goto done;
1003 			}
1004 			break; /* EOF */
1005 		}
1006 		remain -= n;
1007 		total += n;
1008 	};
1009 
1010 done:
1011 	if (err == NULL) {
1012 		*outbuf = buf;
1013 		*outlen = total;
1014 	} else
1015 		free(buf);
1016 	return err;
1017 }