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Date:: Mon Sep 10 15:07:59 2018 UTC
Message:: read packed commits with privsep
Actions:: History | Blame | Raw File
1 /*
2  * Copyright (c) 2018 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 #include <sys/syslimits.h>
24 
25 #include <errno.h>
26 #include <fcntl.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <stdint.h>
31 #include <sha1.h>
32 #include <zlib.h>
33 #include <ctype.h>
34 #include <limits.h>
35 #include <imsg.h>
36 #include <time.h>
37 
38 #include "got_error.h"
39 #include "got_object.h"
40 #include "got_repository.h"
41 #include "got_opentemp.h"
42 
43 #include "got_lib_sha1.h"
44 #include "got_lib_delta.h"
45 #include "got_lib_pack.h"
46 #include "got_lib_path.h"
47 #include "got_lib_inflate.h"
48 #include "got_lib_object.h"
49 #include "got_lib_privsep.h"
50 #include "got_lib_object_parse.h"
51 #include "got_lib_repository.h"
52 
53 #ifndef MIN
54 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
55 #endif
56 
57 const struct got_error *
58 got_object_id_str(char **outbuf, struct got_object_id *id)
59 {
60 	static const size_t len = SHA1_DIGEST_STRING_LENGTH;
61 
62 	*outbuf = malloc(len);
63 	if (*outbuf == NULL)
64 		return got_error_from_errno();
65 
66 	if (got_sha1_digest_to_str(id->sha1, *outbuf, len) == NULL) {
67 		free(*outbuf);
68 		*outbuf = NULL;
69 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
70 	}
71 
72 	return NULL;
73 }
74 
75 int
76 got_object_id_cmp(struct got_object_id *id1, struct got_object_id *id2)
77 {
78 	return memcmp(id1->sha1, id2->sha1, SHA1_DIGEST_LENGTH);
79 }
80 
81 struct got_object_id *
82 got_object_id_dup(struct got_object_id *id1)
83 {
84 	struct got_object_id *id2;
85 
86 	id2 = malloc(sizeof(*id2));
87 	if (id2 == NULL)
88 		return NULL;
89 	memcpy(id2, id1, sizeof(*id2));
90 	return id2;
91 }
92 
93 struct got_object_id *
94 got_object_get_id(struct got_object *obj)
95 {
96 	return got_object_id_dup(&obj->id);
97 }
98 
99 const struct got_error *
100 got_object_get_id_str(char **outbuf, struct got_object *obj)
101 {
102 	return got_object_id_str(outbuf, &obj->id);
103 }
104 
105 int
106 got_object_get_type(struct got_object *obj)
107 {
108 	switch (obj->type) {
109 	case GOT_OBJ_TYPE_COMMIT:
110 	case GOT_OBJ_TYPE_TREE:
111 	case GOT_OBJ_TYPE_BLOB:
112 	case GOT_OBJ_TYPE_TAG:
113 		return obj->type;
114 	default:
115 		abort();
116 		break;
117 	}
118 
119 	/* not reached */
120 	return 0;
121 }
122 
123 static const struct got_error *
124 object_path(char **path, struct got_object_id *id, struct got_repository *repo)
125 {
126 	const struct got_error *err = NULL;
127 	char *hex = NULL;
128 	char *path_objects = got_repo_get_path_objects(repo);
129 
130 	*path = NULL;
131 
132 	if (path_objects == NULL)
133 		return got_error_from_errno();
134 
135 	err = got_object_id_str(&hex, id);
136 	if (err)
137 		goto done;
138 
139 	if (asprintf(path, "%s/%.2x/%s", path_objects,
140 	    id->sha1[0], hex + 2) == -1)
141 		err = got_error_from_errno();
142 
143 done:
144 	free(hex);
145 	free(path_objects);
146 	return err;
147 }
148 
149 static const struct got_error *
150 open_loose_object(int *fd, struct got_object *obj, struct got_repository *repo)
151 {
152 	const struct got_error *err = NULL;
153 	char *path;
154 
155 	err = object_path(&path, &obj->id, repo);
156 	if (err)
157 		return err;
158 	*fd = open(path, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
159 	if (*fd == -1) {
160 		err = got_error_from_errno();
161 		goto done;
162 	}
163 done:
164 	free(path);
165 	return err;
166 }
167 
168 static const struct got_error *
169 get_packfile_path(char **path_packfile, struct got_packidx *packidx)
170 {
171 	size_t size;
172 
173 	/* Packfile path contains ".pack" instead of ".idx", so add one byte. */
174 	size = strlen(packidx->path_packidx) + 2;
175 	if (size < GOT_PACKFILE_NAMELEN + 1)
176 		return got_error(GOT_ERR_BAD_PATH);
177 
178 	*path_packfile = calloc(size, sizeof(**path_packfile));
179 	if (*path_packfile == NULL)
180 		return got_error_from_errno();
181 
182 	/* Copy up to and excluding ".idx". */
183 	if (strlcpy(*path_packfile, packidx->path_packidx,
184 	    size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
185 		return got_error(GOT_ERR_NO_SPACE);
186 
187 	if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
188 		return got_error(GOT_ERR_NO_SPACE);
189 
190 	return NULL;
191 }
192 
193 static const struct got_error *
194 open_packed_object(struct got_object **obj, struct got_object_id *id,
195     struct got_repository *repo)
196 {
197 	const struct got_error *err = NULL;
198 	struct got_pack *pack = NULL;
199 	struct got_packidx *packidx = NULL;
200 	int idx;
201 	char *path_packfile;
202 
203 	err = got_repo_search_packidx(&packidx, &idx, repo, id);
204 	if (err)
205 		return err;
206 
207 	err = get_packfile_path(&path_packfile, packidx);
208 	if (err)
209 		return err;
210 
211 	pack = got_repo_get_cached_pack(repo, path_packfile);
212 	if (pack == NULL) {
213 		err = got_repo_cache_pack(&pack, repo, path_packfile, packidx);
214 		if (err)
215 			goto done;
216 	}
217 
218 	err = got_object_packed_read_privsep(obj, repo, pack, packidx, idx, id);
219 	if (err)
220 		goto done;
221 
222 	err = got_repo_cache_pack(NULL, repo, (*obj)->path_packfile, packidx);
223 done:
224 	free(path_packfile);
225 	return err;
226 }
227 
228 const struct got_error *
229 got_object_open(struct got_object **obj, struct got_repository *repo,
230     struct got_object_id *id)
231 {
232 	const struct got_error *err = NULL;
233 	char *path;
234 	int fd;
235 
236 	*obj = got_repo_get_cached_object(repo, id);
237 	if (*obj != NULL) {
238 		(*obj)->refcnt++;
239 		return NULL;
240 	}
241 
242 	err = object_path(&path, id, repo);
243 	if (err)
244 		return err;
245 
246 	fd = open(path, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
247 	if (fd == -1) {
248 		if (errno != ENOENT) {
249 			err = got_error_from_errno();
250 			goto done;
251 		}
252 		err = open_packed_object(obj, id, repo);
253 		if (err)
254 			goto done;
255 		if (*obj == NULL)
256 			err = got_error(GOT_ERR_NO_OBJ);
257 	} else {
258 		err = got_object_read_header_privsep(obj, repo, fd);
259 		if (err)
260 			goto done;
261 		memcpy((*obj)->id.sha1, id->sha1, SHA1_DIGEST_LENGTH);
262 	}
263 
264 	if (err == NULL) {
265 		(*obj)->refcnt++;
266 		err = got_repo_cache_object(repo, id, *obj);
267 	}
268 done:
269 	free(path);
270 	if (fd != -1)
271 		close(fd);
272 	return err;
273 
274 }
275 
276 const struct got_error *
277 got_object_open_by_id_str(struct got_object **obj, struct got_repository *repo,
278     const char *id_str)
279 {
280 	struct got_object_id id;
281 
282 	if (!got_parse_sha1_digest(id.sha1, id_str))
283 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
284 
285 	return got_object_open(obj, repo, &id);
286 }
287 
288 const struct got_error *
289 got_object_open_as_commit(struct got_commit_object **commit,
290     struct got_repository *repo, struct got_object_id *id)
291 {
292 	const struct got_error *err;
293 	struct got_object *obj;
294 
295 	*commit = NULL;
296 
297 	err = got_object_open(&obj, repo, id);
298 	if (err)
299 		return err;
300 	if (got_object_get_type(obj) != GOT_OBJ_TYPE_COMMIT) {
301 		err = got_error(GOT_ERR_OBJ_TYPE);
302 		goto done;
303 	}
304 
305 	err = got_object_commit_open(commit, repo, obj);
306 done:
307 	got_object_close(obj);
308 	return err;
309 }
310 
311 const struct got_error *
312 got_object_qid_alloc(struct got_object_qid **qid, struct got_object_id *id)
313 {
314 	const struct got_error *err = NULL;
315 
316 	*qid = calloc(1, sizeof(**qid));
317 	if (*qid == NULL)
318 		return got_error_from_errno();
319 
320 	(*qid)->id = got_object_id_dup(id);
321 	if ((*qid)->id == NULL) {
322 		err = got_error_from_errno();
323 		got_object_qid_free(*qid);
324 		*qid = NULL;
325 		return err;
326 	}
327 
328 	return NULL;
329 }
330 
331 static const struct got_error *
332 extract_packed_object_to_mem(uint8_t **buf, size_t *len,
333     struct got_object *obj, struct got_repository *repo)
334 {
335 	const struct got_error *err = NULL;
336 	struct got_pack *pack;
337 
338 	if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
339 		return got_error(GOT_ERR_OBJ_NOT_PACKED);
340 
341 	pack = got_repo_get_cached_pack(repo, obj->path_packfile);
342 	if (pack == NULL) {
343 		err = got_repo_cache_pack(&pack, repo,
344 		    obj->path_packfile, NULL);
345 		if (err)
346 			return err;
347 	}
348 
349 	return got_packfile_extract_object_to_mem(buf, len, obj, pack);
350 }
351 
352 const struct got_error *
353 got_object_commit_open(struct got_commit_object **commit,
354     struct got_repository *repo, struct got_object *obj)
355 {
356 	const struct got_error *err = NULL;
357 
358 	*commit = got_repo_get_cached_commit(repo, &obj->id);
359 	if (*commit != NULL) {
360 		(*commit)->refcnt++;
361 		return NULL;
362 	}
363 
364 	if (obj->type != GOT_OBJ_TYPE_COMMIT)
365 		return got_error(GOT_ERR_OBJ_TYPE);
366 
367 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
368 		struct got_pack *pack;
369 		pack = got_repo_get_cached_pack(repo, obj->path_packfile);
370 		if (pack == NULL) {
371 			err = got_repo_cache_pack(&pack, repo,
372 			    obj->path_packfile, NULL);
373 			if (err)
374 				return err;
375 		}
376 		err = got_object_read_packed_commit_privsep(commit, obj, pack);
377 	} else {
378 		int fd;
379 		err = open_loose_object(&fd, obj, repo);
380 		if (err)
381 			return err;
382 		err = got_object_read_commit_privsep(commit, obj, fd, repo);
383 		close(fd);
384 	}
385 
386 	if (err == NULL) {
387 		(*commit)->refcnt++;
388 		err = got_repo_cache_commit(repo, &obj->id, *commit);
389 	}
390 
391 	return err;
392 }
393 
394 const struct got_error *
395 got_object_tree_open(struct got_tree_object **tree,
396     struct got_repository *repo, struct got_object *obj)
397 {
398 	const struct got_error *err = NULL;
399 
400 	*tree = got_repo_get_cached_tree(repo, &obj->id);
401 	if (*tree != NULL) {
402 		(*tree)->refcnt++;
403 		return NULL;
404 	}
405 
406 	if (obj->type != GOT_OBJ_TYPE_TREE)
407 		return got_error(GOT_ERR_OBJ_TYPE);
408 
409 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
410 		uint8_t *buf;
411 		size_t len;
412 		err = extract_packed_object_to_mem(&buf, &len, obj, repo);
413 		if (err)
414 			return err;
415 		obj->size = len;
416 		err = got_object_parse_tree(tree, buf, len);
417 		free(buf);
418 	} else {
419 		int fd;
420 		err = open_loose_object(&fd, obj, repo);
421 		if (err)
422 			return err;
423 		err = got_object_read_tree_privsep(tree, obj, fd, repo);
424 		close(fd);
425 	}
426 
427 	if (err == NULL) {
428 		(*tree)->refcnt++;
429 		err = got_repo_cache_tree(repo, &obj->id, *tree);
430 	}
431 
432 	return err;
433 }
434 
435 const struct got_error *
436 got_object_open_as_tree(struct got_tree_object **tree,
437     struct got_repository *repo, struct got_object_id *id)
438 {
439 	const struct got_error *err;
440 	struct got_object *obj;
441 
442 	*tree = NULL;
443 
444 	err = got_object_open(&obj, repo, id);
445 	if (err)
446 		return err;
447 	if (got_object_get_type(obj) != GOT_OBJ_TYPE_TREE) {
448 		err = got_error(GOT_ERR_OBJ_TYPE);
449 		goto done;
450 	}
451 
452 	err = got_object_tree_open(tree, repo, obj);
453 done:
454 	got_object_close(obj);
455 	return err;
456 }
457 
458 const struct got_tree_entries *
459 got_object_tree_get_entries(struct got_tree_object *tree)
460 {
461 	return &tree->entries;
462 }
463 
464 static const struct got_error *
465 extract_packed_object(FILE **f, struct got_object *obj,
466     struct got_repository *repo)
467 {
468 	const struct got_error *err = NULL;
469 	struct got_pack *pack;
470 	int fd;
471 
472 	if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
473 		return got_error(GOT_ERR_OBJ_NOT_PACKED);
474 
475 	fd = got_opentempfd();
476 	if (fd == -1)
477 		return got_error_from_errno();
478 
479 	*f = fdopen(fd, "w+");
480 	if (*f == NULL) {
481 		err = got_error_from_errno();
482 		goto done;
483 	}
484 
485 	pack = got_repo_get_cached_pack(repo, obj->path_packfile);
486 	if (pack == NULL) {
487 		err = got_repo_cache_pack(&pack, repo,
488 		    obj->path_packfile, NULL);
489 		if (err)
490 			goto done;
491 	}
492 
493 	err = got_packfile_extract_object(pack, obj, *f);
494 done:
495 	if (err) {
496 		if (*f == NULL)
497 			close(fd);
498 		else
499 			fclose(*f);
500 		*f = NULL;
501 	}
502 	return err;
503 }
504 
505 const struct got_error *
506 got_object_blob_open(struct got_blob_object **blob,
507     struct got_repository *repo, struct got_object *obj, size_t blocksize)
508 {
509 	const struct got_error *err = NULL;
510 
511 	if (obj->type != GOT_OBJ_TYPE_BLOB)
512 		return got_error(GOT_ERR_OBJ_TYPE);
513 
514 	if (blocksize < obj->hdrlen)
515 		return got_error(GOT_ERR_NO_SPACE);
516 
517 	*blob = calloc(1, sizeof(**blob));
518 	if (*blob == NULL)
519 		return got_error_from_errno();
520 
521 	(*blob)->read_buf = malloc(blocksize);
522 	if ((*blob)->read_buf == NULL) {
523 		err = got_error_from_errno();
524 		goto done;
525 	}
526 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
527 		err = extract_packed_object(&((*blob)->f), obj, repo);
528 		if (err)
529 			goto done;
530 	} else {
531 		int infd, outfd;
532 		size_t size;
533 		struct stat sb;
534 
535 		err = open_loose_object(&infd, obj, repo);
536 		if (err)
537 			goto done;
538 
539 
540 		outfd = got_opentempfd();
541 		if (outfd == -1) {
542 			err = got_error_from_errno();
543 			close(infd);
544 			goto done;
545 		}
546 
547 		err = got_object_read_blob_privsep(&size, outfd, infd, repo);
548 		close(infd);
549 		if (err)
550 			goto done;
551 
552 		if (size != obj->hdrlen + obj->size) {
553 			err = got_error(GOT_ERR_PRIVSEP_LEN);
554 			close(outfd);
555 			goto done;
556 		}
557 
558 		if (fstat(outfd, &sb) == -1) {
559 			err = got_error_from_errno();
560 			close(outfd);
561 			goto done;
562 		}
563 
564 		if (sb.st_size != size) {
565 			err = got_error(GOT_ERR_PRIVSEP_LEN);
566 			close(outfd);
567 			goto done;
568 		}
569 
570 		(*blob)->f = fdopen(outfd, "rb");
571 		if ((*blob)->f == NULL) {
572 			err = got_error_from_errno();
573 			close(outfd);
574 			goto done;
575 		}
576 	}
577 
578 	(*blob)->hdrlen = obj->hdrlen;
579 	(*blob)->blocksize = blocksize;
580 	memcpy(&(*blob)->id.sha1, obj->id.sha1, SHA1_DIGEST_LENGTH);
581 
582 done:
583 	if (err && *blob) {
584 		if ((*blob)->f)
585 			fclose((*blob)->f);
586 		free((*blob)->read_buf);
587 		free(*blob);
588 		*blob = NULL;
589 	}
590 	return err;
591 }
592 
593 const struct got_error *
594 got_object_open_as_blob(struct got_blob_object **blob,
595     struct got_repository *repo, struct got_object_id *id,
596     size_t blocksize)
597 {
598 	const struct got_error *err;
599 	struct got_object *obj;
600 
601 	*blob = NULL;
602 
603 	err = got_object_open(&obj, repo, id);
604 	if (err)
605 		return err;
606 	if (got_object_get_type(obj) != GOT_OBJ_TYPE_BLOB) {
607 		err = got_error(GOT_ERR_OBJ_TYPE);
608 		goto done;
609 	}
610 
611 	err = got_object_blob_open(blob, repo, obj, blocksize);
612 done:
613 	got_object_close(obj);
614 	return err;
615 }
616 
617 void
618 got_object_blob_close(struct got_blob_object *blob)
619 {
620 	free(blob->read_buf);
621 	fclose(blob->f);
622 	free(blob);
623 }
624 
625 char *
626 got_object_blob_id_str(struct got_blob_object *blob, char *buf, size_t size)
627 {
628 	return got_sha1_digest_to_str(blob->id.sha1, buf, size);
629 }
630 
631 size_t
632 got_object_blob_get_hdrlen(struct got_blob_object *blob)
633 {
634 	return blob->hdrlen;
635 }
636 
637 const uint8_t *
638 got_object_blob_get_read_buf(struct got_blob_object *blob)
639 {
640 	return blob->read_buf;
641 }
642 
643 const struct got_error *
644 got_object_blob_read_block(size_t *outlenp, struct got_blob_object *blob)
645 {
646 	size_t n;
647 
648 	n = fread(blob->read_buf, 1, blob->blocksize, blob->f);
649 	if (n == 0 && ferror(blob->f))
650 		return got_ferror(blob->f, GOT_ERR_IO);
651 	*outlenp = n;
652 	return NULL;
653 }
654 
655 const struct got_error *
656 got_object_blob_dump_to_file(size_t *total_len, size_t *nlines,
657     FILE *outfile, struct got_blob_object *blob)
658 {
659 	const struct got_error *err = NULL;
660 	size_t len, hdrlen;
661 	const uint8_t *buf;
662 	int i;
663 
664 	if (total_len)
665 		*total_len = 0;
666 	if (nlines)
667 		*nlines = 0;
668 
669 	hdrlen = got_object_blob_get_hdrlen(blob);
670 	do {
671 		err = got_object_blob_read_block(&len, blob);
672 		if (err)
673 			return err;
674 		if (len == 0)
675 			break;
676 		if (total_len)
677 			*total_len += len;
678 		buf = got_object_blob_get_read_buf(blob);
679 		if (nlines) {
680 			for (i = 0; i < len; i++) {
681 				if (buf[i] == '\n')
682 					(*nlines)++;
683 			}
684 		}
685 		/* Skip blob object header first time around. */
686 		fwrite(buf + hdrlen, len - hdrlen, 1, outfile);
687 		hdrlen = 0;
688 	} while (len != 0);
689 
690 	fflush(outfile);
691 	rewind(outfile);
692 
693 	return NULL;
694 }
695 
696 static struct got_tree_entry *
697 find_entry_by_name(struct got_tree_object *tree, const char *name)
698 {
699 	struct got_tree_entry *te;
700 
701 	SIMPLEQ_FOREACH(te, &tree->entries.head, entry) {
702 		if (strcmp(te->name, name) == 0)
703 			return te;
704 	}
705 	return NULL;
706 }
707 
708 const struct got_error *
709 got_object_open_by_path(struct got_object **obj, struct got_repository *repo,
710     struct got_object_id *commit_id, const char *path)
711 {
712 	const struct got_error *err = NULL;
713 	struct got_commit_object *commit = NULL;
714 	struct got_tree_object *tree = NULL;
715 	struct got_tree_entry *te = NULL;
716 	char *seg, *s, *s0 = NULL;
717 	size_t len = strlen(path);
718 
719 	*obj = NULL;
720 
721 	/* We are expecting an absolute in-repository path. */
722 	if (path[0] != '/')
723 		return got_error(GOT_ERR_NOT_ABSPATH);
724 
725 	err = got_object_open_as_commit(&commit, repo, commit_id);
726 	if (err)
727 		goto done;
728 
729 	/* Handle opening of root of commit's tree. */
730 	if (path[1] == '\0') {
731 		err = got_object_open(obj, repo, commit->tree_id);
732 		goto done;
733 	}
734 
735 	err = got_object_open_as_tree(&tree, repo, commit->tree_id);
736 	if (err)
737 		goto done;
738 
739 	s0 = strdup(path);
740 	if (s0 == NULL) {
741 		err = got_error_from_errno();
742 		goto done;
743 	}
744 	err = got_canonpath(path, s0, len + 1);
745 	if (err)
746 		goto done;
747 
748 	s = s0;
749 	s++; /* skip leading '/' */
750 	len--;
751 	seg = s;
752 	while (len > 0) {
753 		struct got_tree_object *next_tree;
754 
755 		if (*s != '/') {
756 			s++;
757 			len--;
758 			if (*s)
759 				continue;
760 		}
761 
762 		/* end of path segment */
763 		*s = '\0';
764 
765 		te = find_entry_by_name(tree, seg);
766 		if (te == NULL) {
767 			err = got_error(GOT_ERR_NO_OBJ);
768 			goto done;
769 		}
770 
771 		if (len == 0)
772 			break;
773 
774 		seg = s + 1;
775 		s++;
776 		len--;
777 		if (*s) {
778 			err = got_object_open_as_tree(&next_tree, repo,
779 			    te->id);
780 			te = NULL;
781 			if (err)
782 				goto done;
783 			got_object_tree_close(tree);
784 			tree = next_tree;
785 		}
786 	}
787 
788 	if (te)
789 		err = got_object_open(obj, repo, te->id);
790 	else
791 		err = got_error(GOT_ERR_NO_OBJ);
792 done:
793 	free(s0);
794 	if (commit)
795 		got_object_commit_close(commit);
796 	if (tree)
797 		got_object_tree_close(tree);
798 	return err;
799 }