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Date:: Mon Sep 10 10:30:47 2018 UTC
Message:: start reading pack files with privsep; still WIP
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 		uint8_t *buf;
369 		size_t len;
370 		err = extract_packed_object_to_mem(&buf, &len, obj, repo);
371 		if (err)
372 			return err;
373 		obj->size = len;
374 		err = got_object_parse_commit(commit, buf, len);
375 		free(buf);
376 	} else {
377 		int fd;
378 		err = open_loose_object(&fd, obj, repo);
379 		if (err)
380 			return err;
381 		err = got_object_read_commit_privsep(commit, obj, fd, repo);
382 		close(fd);
383 	}
384 
385 	if (err == NULL) {
386 		(*commit)->refcnt++;
387 		err = got_repo_cache_commit(repo, &obj->id, *commit);
388 	}
389 
390 	return err;
391 }
392 
393 const struct got_error *
394 got_object_tree_open(struct got_tree_object **tree,
395     struct got_repository *repo, struct got_object *obj)
396 {
397 	const struct got_error *err = NULL;
398 
399 	*tree = got_repo_get_cached_tree(repo, &obj->id);
400 	if (*tree != NULL) {
401 		(*tree)->refcnt++;
402 		return NULL;
403 	}
404 
405 	if (obj->type != GOT_OBJ_TYPE_TREE)
406 		return got_error(GOT_ERR_OBJ_TYPE);
407 
408 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
409 		uint8_t *buf;
410 		size_t len;
411 		err = extract_packed_object_to_mem(&buf, &len, obj, repo);
412 		if (err)
413 			return err;
414 		obj->size = len;
415 		err = got_object_parse_tree(tree, buf, len);
416 		free(buf);
417 	} else {
418 		int fd;
419 		err = open_loose_object(&fd, obj, repo);
420 		if (err)
421 			return err;
422 		err = got_object_read_tree_privsep(tree, obj, fd, repo);
423 		close(fd);
424 	}
425 
426 	if (err == NULL) {
427 		(*tree)->refcnt++;
428 		err = got_repo_cache_tree(repo, &obj->id, *tree);
429 	}
430 
431 	return err;
432 }
433 
434 const struct got_error *
435 got_object_open_as_tree(struct got_tree_object **tree,
436     struct got_repository *repo, struct got_object_id *id)
437 {
438 	const struct got_error *err;
439 	struct got_object *obj;
440 
441 	*tree = NULL;
442 
443 	err = got_object_open(&obj, repo, id);
444 	if (err)
445 		return err;
446 	if (got_object_get_type(obj) != GOT_OBJ_TYPE_TREE) {
447 		err = got_error(GOT_ERR_OBJ_TYPE);
448 		goto done;
449 	}
450 
451 	err = got_object_tree_open(tree, repo, obj);
452 done:
453 	got_object_close(obj);
454 	return err;
455 }
456 
457 const struct got_tree_entries *
458 got_object_tree_get_entries(struct got_tree_object *tree)
459 {
460 	return &tree->entries;
461 }
462 
463 static const struct got_error *
464 extract_packed_object(FILE **f, struct got_object *obj,
465     struct got_repository *repo)
466 {
467 	const struct got_error *err = NULL;
468 	struct got_pack *pack;
469 	int fd;
470 
471 	if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
472 		return got_error(GOT_ERR_OBJ_NOT_PACKED);
473 
474 	fd = got_opentempfd();
475 	if (fd == -1)
476 		return got_error_from_errno();
477 
478 	*f = fdopen(fd, "w+");
479 	if (*f == NULL) {
480 		err = got_error_from_errno();
481 		goto done;
482 	}
483 
484 	pack = got_repo_get_cached_pack(repo, obj->path_packfile);
485 	if (pack == NULL) {
486 		err = got_repo_cache_pack(&pack, repo,
487 		    obj->path_packfile, NULL);
488 		if (err)
489 			goto done;
490 	}
491 
492 	err = got_packfile_extract_object(pack, obj, *f);
493 done:
494 	if (err) {
495 		if (*f == NULL)
496 			close(fd);
497 		else
498 			fclose(*f);
499 		*f = NULL;
500 	}
501 	return err;
502 }
503 
504 const struct got_error *
505 got_object_blob_open(struct got_blob_object **blob,
506     struct got_repository *repo, struct got_object *obj, size_t blocksize)
507 {
508 	const struct got_error *err = NULL;
509 
510 	if (obj->type != GOT_OBJ_TYPE_BLOB)
511 		return got_error(GOT_ERR_OBJ_TYPE);
512 
513 	if (blocksize < obj->hdrlen)
514 		return got_error(GOT_ERR_NO_SPACE);
515 
516 	*blob = calloc(1, sizeof(**blob));
517 	if (*blob == NULL)
518 		return got_error_from_errno();
519 
520 	(*blob)->read_buf = malloc(blocksize);
521 	if ((*blob)->read_buf == NULL) {
522 		err = got_error_from_errno();
523 		goto done;
524 	}
525 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
526 		err = extract_packed_object(&((*blob)->f), obj, repo);
527 		if (err)
528 			goto done;
529 	} else {
530 		int infd, outfd;
531 		size_t size;
532 		struct stat sb;
533 
534 		err = open_loose_object(&infd, obj, repo);
535 		if (err)
536 			goto done;
537 
538 
539 		outfd = got_opentempfd();
540 		if (outfd == -1) {
541 			err = got_error_from_errno();
542 			close(infd);
543 			goto done;
544 		}
545 
546 		err = got_object_read_blob_privsep(&size, outfd, infd, repo);
547 		close(infd);
548 		if (err)
549 			goto done;
550 
551 		if (size != obj->hdrlen + obj->size) {
552 			err = got_error(GOT_ERR_PRIVSEP_LEN);
553 			close(outfd);
554 			goto done;
555 		}
556 
557 		if (fstat(outfd, &sb) == -1) {
558 			err = got_error_from_errno();
559 			close(outfd);
560 			goto done;
561 		}
562 
563 		if (sb.st_size != size) {
564 			err = got_error(GOT_ERR_PRIVSEP_LEN);
565 			close(outfd);
566 			goto done;
567 		}
568 
569 		(*blob)->f = fdopen(outfd, "rb");
570 		if ((*blob)->f == NULL) {
571 			err = got_error_from_errno();
572 			close(outfd);
573 			goto done;
574 		}
575 	}
576 
577 	(*blob)->hdrlen = obj->hdrlen;
578 	(*blob)->blocksize = blocksize;
579 	memcpy(&(*blob)->id.sha1, obj->id.sha1, SHA1_DIGEST_LENGTH);
580 
581 done:
582 	if (err && *blob) {
583 		if ((*blob)->f)
584 			fclose((*blob)->f);
585 		free((*blob)->read_buf);
586 		free(*blob);
587 		*blob = NULL;
588 	}
589 	return err;
590 }
591 
592 const struct got_error *
593 got_object_open_as_blob(struct got_blob_object **blob,
594     struct got_repository *repo, struct got_object_id *id,
595     size_t blocksize)
596 {
597 	const struct got_error *err;
598 	struct got_object *obj;
599 
600 	*blob = NULL;
601 
602 	err = got_object_open(&obj, repo, id);
603 	if (err)
604 		return err;
605 	if (got_object_get_type(obj) != GOT_OBJ_TYPE_BLOB) {
606 		err = got_error(GOT_ERR_OBJ_TYPE);
607 		goto done;
608 	}
609 
610 	err = got_object_blob_open(blob, repo, obj, blocksize);
611 done:
612 	got_object_close(obj);
613 	return err;
614 }
615 
616 void
617 got_object_blob_close(struct got_blob_object *blob)
618 {
619 	free(blob->read_buf);
620 	fclose(blob->f);
621 	free(blob);
622 }
623 
624 char *
625 got_object_blob_id_str(struct got_blob_object *blob, char *buf, size_t size)
626 {
627 	return got_sha1_digest_to_str(blob->id.sha1, buf, size);
628 }
629 
630 size_t
631 got_object_blob_get_hdrlen(struct got_blob_object *blob)
632 {
633 	return blob->hdrlen;
634 }
635 
636 const uint8_t *
637 got_object_blob_get_read_buf(struct got_blob_object *blob)
638 {
639 	return blob->read_buf;
640 }
641 
642 const struct got_error *
643 got_object_blob_read_block(size_t *outlenp, struct got_blob_object *blob)
644 {
645 	size_t n;
646 
647 	n = fread(blob->read_buf, 1, blob->blocksize, blob->f);
648 	if (n == 0 && ferror(blob->f))
649 		return got_ferror(blob->f, GOT_ERR_IO);
650 	*outlenp = n;
651 	return NULL;
652 }
653 
654 const struct got_error *
655 got_object_blob_dump_to_file(size_t *total_len, size_t *nlines,
656     FILE *outfile, struct got_blob_object *blob)
657 {
658 	const struct got_error *err = NULL;
659 	size_t len, hdrlen;
660 	const uint8_t *buf;
661 	int i;
662 
663 	if (total_len)
664 		*total_len = 0;
665 	if (nlines)
666 		*nlines = 0;
667 
668 	hdrlen = got_object_blob_get_hdrlen(blob);
669 	do {
670 		err = got_object_blob_read_block(&len, blob);
671 		if (err)
672 			return err;
673 		if (len == 0)
674 			break;
675 		if (total_len)
676 			*total_len += len;
677 		buf = got_object_blob_get_read_buf(blob);
678 		if (nlines) {
679 			for (i = 0; i < len; i++) {
680 				if (buf[i] == '\n')
681 					(*nlines)++;
682 			}
683 		}
684 		/* Skip blob object header first time around. */
685 		fwrite(buf + hdrlen, len - hdrlen, 1, outfile);
686 		hdrlen = 0;
687 	} while (len != 0);
688 
689 	fflush(outfile);
690 	rewind(outfile);
691 
692 	return NULL;
693 }
694 
695 static struct got_tree_entry *
696 find_entry_by_name(struct got_tree_object *tree, const char *name)
697 {
698 	struct got_tree_entry *te;
699 
700 	SIMPLEQ_FOREACH(te, &tree->entries.head, entry) {
701 		if (strcmp(te->name, name) == 0)
702 			return te;
703 	}
704 	return NULL;
705 }
706 
707 const struct got_error *
708 got_object_open_by_path(struct got_object **obj, struct got_repository *repo,
709     struct got_object_id *commit_id, const char *path)
710 {
711 	const struct got_error *err = NULL;
712 	struct got_commit_object *commit = NULL;
713 	struct got_tree_object *tree = NULL;
714 	struct got_tree_entry *te = NULL;
715 	char *seg, *s, *s0 = NULL;
716 	size_t len = strlen(path);
717 
718 	*obj = NULL;
719 
720 	/* We are expecting an absolute in-repository path. */
721 	if (path[0] != '/')
722 		return got_error(GOT_ERR_NOT_ABSPATH);
723 
724 	err = got_object_open_as_commit(&commit, repo, commit_id);
725 	if (err)
726 		goto done;
727 
728 	/* Handle opening of root of commit's tree. */
729 	if (path[1] == '\0') {
730 		err = got_object_open(obj, repo, commit->tree_id);
731 		goto done;
732 	}
733 
734 	err = got_object_open_as_tree(&tree, repo, commit->tree_id);
735 	if (err)
736 		goto done;
737 
738 	s0 = strdup(path);
739 	if (s0 == NULL) {
740 		err = got_error_from_errno();
741 		goto done;
742 	}
743 	err = got_canonpath(path, s0, len + 1);
744 	if (err)
745 		goto done;
746 
747 	s = s0;
748 	s++; /* skip leading '/' */
749 	len--;
750 	seg = s;
751 	while (len > 0) {
752 		struct got_tree_object *next_tree;
753 
754 		if (*s != '/') {
755 			s++;
756 			len--;
757 			if (*s)
758 				continue;
759 		}
760 
761 		/* end of path segment */
762 		*s = '\0';
763 
764 		te = find_entry_by_name(tree, seg);
765 		if (te == NULL) {
766 			err = got_error(GOT_ERR_NO_OBJ);
767 			goto done;
768 		}
769 
770 		if (len == 0)
771 			break;
772 
773 		seg = s + 1;
774 		s++;
775 		len--;
776 		if (*s) {
777 			err = got_object_open_as_tree(&next_tree, repo,
778 			    te->id);
779 			te = NULL;
780 			if (err)
781 				goto done;
782 			got_object_tree_close(tree);
783 			tree = next_tree;
784 		}
785 	}
786 
787 	if (te)
788 		err = got_object_open(obj, repo, te->id);
789 	else
790 		err = got_error(GOT_ERR_NO_OBJ);
791 done:
792 	free(s0);
793 	if (commit)
794 		got_object_commit_close(commit);
795 	if (tree)
796 		got_object_tree_close(tree);
797 	return err;
798 }