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/wait.h>
23 #include <sys/syslimits.h>
24 #include <sys/resource.h>
25 
26 #include <errno.h>
27 #include <fcntl.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <stdint.h>
32 #include <sha1.h>
33 #include <zlib.h>
34 #include <ctype.h>
35 #include <limits.h>
36 #include <imsg.h>
37 #include <time.h>
38 
39 #include "got_error.h"
40 #include "got_object.h"
41 #include "got_repository.h"
42 #include "got_opentemp.h"
43 #include "got_path.h"
44 
45 #include "got_lib_sha1.h"
46 #include "got_lib_delta.h"
47 #include "got_lib_inflate.h"
48 #include "got_lib_object.h"
49 #include "got_lib_privsep.h"
50 #include "got_lib_object_idcache.h"
51 #include "got_lib_object_cache.h"
52 #include "got_lib_object_parse.h"
53 #include "got_lib_pack.h"
54 #include "got_lib_fetch.h"
55 #include "got_lib_repository.h"
56 
57 #ifndef MIN
58 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
59 #endif
60 
61 struct got_object_id *
62 got_object_get_id(struct got_object *obj)
63 {
64 	return &obj->id;
65 }
66 
67 const struct got_error *
68 got_object_get_id_str(char **outbuf, struct got_object *obj)
69 {
70 	return got_object_id_str(outbuf, &obj->id);
71 }
72 
73 const struct got_error *
74 got_object_get_type(int *type, struct got_repository *repo,
75     struct got_object_id *id)
76 {
77 	const struct got_error *err = NULL;
78 	struct got_object *obj;
79 
80 	err = got_object_open(&obj, repo, id);
81 	if (err)
82 		return err;
83 
84 	switch (obj->type) {
85 	case GOT_OBJ_TYPE_COMMIT:
86 	case GOT_OBJ_TYPE_TREE:
87 	case GOT_OBJ_TYPE_BLOB:
88 	case GOT_OBJ_TYPE_TAG:
89 		*type = obj->type;
90 		break;
91 	default:
92 		err = got_error(GOT_ERR_OBJ_TYPE);
93 		break;
94 	}
95 
96 	got_object_close(obj);
97 	return err;
98 }
99 
100 const struct got_error *
101 got_object_get_path(char **path, struct got_object_id *id,
102     struct got_repository *repo)
103 {
104 	const struct got_error *err = NULL;
105 	char *hex = NULL;
106 	char *path_objects;
107 
108 	*path = NULL;
109 
110 	path_objects = got_repo_get_path_objects(repo);
111 	if (path_objects == NULL)
112 		return got_error_from_errno("got_repo_get_path_objects");
113 
114 	err = got_object_id_str(&hex, id);
115 	if (err)
116 		goto done;
117 
118 	if (asprintf(path, "%s/%.2x/%s", path_objects,
119 	    id->sha1[0], hex + 2) == -1)
120 		err = got_error_from_errno("asprintf");
121 
122 done:
123 	free(hex);
124 	free(path_objects);
125 	return err;
126 }
127 
128 static const struct got_error *
129 open_loose_object(int *fd, struct got_object_id *id,
130     struct got_repository *repo)
131 {
132 	const struct got_error *err = NULL;
133 	char *path;
134 
135 	err = got_object_get_path(&path, id, repo);
136 	if (err)
137 		return err;
138 	*fd = open(path, O_RDONLY | O_NOFOLLOW);
139 	if (*fd == -1) {
140 		err = got_error_from_errno2("open", path);
141 		goto done;
142 	}
143 done:
144 	free(path);
145 	return err;
146 }
147 
148 static const struct got_error *
149 get_packfile_path(char **path_packfile, struct got_packidx *packidx)
150 {
151 	size_t size;
152 
153 	/* Packfile path contains ".pack" instead of ".idx", so add one byte. */
154 	size = strlen(packidx->path_packidx) + 2;
155 	if (size < GOT_PACKFILE_NAMELEN + 1)
156 		return got_error_path(packidx->path_packidx, GOT_ERR_BAD_PATH);
157 
158 	*path_packfile = malloc(size);
159 	if (*path_packfile == NULL)
160 		return got_error_from_errno("malloc");
161 
162 	/* Copy up to and excluding ".idx". */
163 	if (strlcpy(*path_packfile, packidx->path_packidx,
164 	    size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
165 		return got_error(GOT_ERR_NO_SPACE);
166 
167 	if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
168 		return got_error(GOT_ERR_NO_SPACE);
169 
170 	return NULL;
171 }
172 
173 static const struct got_error *
174 request_packed_object(struct got_object **obj, struct got_pack *pack, int idx,
175     struct got_object_id *id)
176 {
177 	const struct got_error *err = NULL;
178 	struct imsgbuf *ibuf = pack->privsep_child->ibuf;
179 
180 	err = got_privsep_send_packed_obj_req(ibuf, idx, id);
181 	if (err)
182 		return err;
183 
184 	err = got_privsep_recv_obj(obj, ibuf);
185 	if (err)
186 		return err;
187 
188 	memcpy(&(*obj)->id, id, sizeof((*obj)->id));
189 
190 	return NULL;
191 }
192 
193 static void
194 set_max_datasize(void)
195 {
196 	struct rlimit rl;
197 
198 	if (getrlimit(RLIMIT_DATA, &rl) != 0)
199 		return;
200 
201 	rl.rlim_cur = rl.rlim_max;
202 	setrlimit(RLIMIT_DATA, &rl);
203 }
204 
205 static const struct got_error *
206 start_pack_privsep_child(struct got_pack *pack, struct got_packidx *packidx)
207 {
208 	const struct got_error *err = NULL;
209 	int imsg_fds[2];
210 	pid_t pid;
211 	struct imsgbuf *ibuf;
212 
213 	ibuf = calloc(1, sizeof(*ibuf));
214 	if (ibuf == NULL)
215 		return got_error_from_errno("calloc");
216 
217 	pack->privsep_child = calloc(1, sizeof(*pack->privsep_child));
218 	if (pack->privsep_child == NULL) {
219 		err = got_error_from_errno("calloc");
220 		free(ibuf);
221 		return err;
222 	}
223 
224 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
225 		err = got_error_from_errno("socketpair");
226 		goto done;
227 	}
228 
229 	pid = fork();
230 	if (pid == -1) {
231 		err = got_error_from_errno("fork");
232 		goto done;
233 	} else if (pid == 0) {
234 		set_max_datasize();
235 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_PACK,
236 		    pack->path_packfile);
237 		/* not reached */
238 	}
239 
240 	if (close(imsg_fds[1]) != 0)
241 		return got_error_from_errno("close");
242 	pack->privsep_child->imsg_fd = imsg_fds[0];
243 	pack->privsep_child->pid = pid;
244 	imsg_init(ibuf, imsg_fds[0]);
245 	pack->privsep_child->ibuf = ibuf;
246 
247 	err = got_privsep_init_pack_child(ibuf, pack, packidx);
248 	if (err) {
249 		const struct got_error *child_err;
250 		err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
251 		child_err = got_privsep_wait_for_child(
252 		    pack->privsep_child->pid);
253 		if (child_err && err == NULL)
254 			err = child_err;
255 	}
256 done:
257 	if (err) {
258 		free(ibuf);
259 		free(pack->privsep_child);
260 		pack->privsep_child = NULL;
261 	}
262 	return err;
263 }
264 
265 static const struct got_error *
266 read_packed_object_privsep(struct got_object **obj,
267     struct got_repository *repo, struct got_pack *pack,
268     struct got_packidx *packidx, int idx, struct got_object_id *id)
269 {
270 	const struct got_error *err = NULL;
271 
272 	if (pack->privsep_child)
273 		return request_packed_object(obj, pack, idx, id);
274 
275 	err = start_pack_privsep_child(pack, packidx);
276 	if (err)
277 		return err;
278 
279 	return request_packed_object(obj, pack, idx, id);
280 }
281 
282 
283 static const struct got_error *
284 open_packed_object(struct got_object **obj, struct got_object_id *id,
285     struct got_repository *repo)
286 {
287 	const struct got_error *err = NULL;
288 	struct got_pack *pack = NULL;
289 	struct got_packidx *packidx = NULL;
290 	int idx;
291 	char *path_packfile;
292 
293 	err = got_repo_search_packidx(&packidx, &idx, repo, id);
294 	if (err)
295 		return err;
296 
297 	err = get_packfile_path(&path_packfile, packidx);
298 	if (err)
299 		return err;
300 
301 	pack = got_repo_get_cached_pack(repo, path_packfile);
302 	if (pack == NULL) {
303 		err = got_repo_cache_pack(&pack, repo, path_packfile, packidx);
304 		if (err)
305 			goto done;
306 	}
307 
308 	err = read_packed_object_privsep(obj, repo, pack, packidx, idx, id);
309 	if (err)
310 		goto done;
311 done:
312 	free(path_packfile);
313 	return err;
314 }
315 
316 static const struct got_error *
317 request_object(struct got_object **obj, struct got_repository *repo, int fd)
318 {
319 	const struct got_error *err = NULL;
320 	struct imsgbuf *ibuf;
321 
322 	ibuf = repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_OBJECT].ibuf;
323 
324 	err = got_privsep_send_obj_req(ibuf, fd);
325 	if (err)
326 		return err;
327 
328 	return got_privsep_recv_obj(obj, ibuf);
329 }
330 
331 static const struct got_error *
332 read_object_header_privsep(struct got_object **obj, struct got_repository *repo,
333     int obj_fd)
334 {
335 	const struct got_error *err;
336 	int imsg_fds[2];
337 	pid_t pid;
338 	struct imsgbuf *ibuf;
339 
340 	if (repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_OBJECT].imsg_fd != -1)
341 		return request_object(obj, repo, obj_fd);
342 
343 	ibuf = calloc(1, sizeof(*ibuf));
344 	if (ibuf == NULL)
345 		return got_error_from_errno("calloc");
346 
347 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
348 		err = got_error_from_errno("socketpair");
349 		free(ibuf);
350 		return err;
351 	}
352 
353 	pid = fork();
354 	if (pid == -1) {
355 		err = got_error_from_errno("fork");
356 		free(ibuf);
357 		return err;
358 	}
359 	else if (pid == 0) {
360 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_OBJECT,
361 		    repo->path);
362 		/* not reached */
363 	}
364 
365 	if (close(imsg_fds[1]) != 0) {
366 		err = got_error_from_errno("close");
367 		free(ibuf);
368 		return err;
369 	}
370 	repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_OBJECT].imsg_fd =
371 	    imsg_fds[0];
372 	repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_OBJECT].pid = pid;
373 	imsg_init(ibuf, imsg_fds[0]);
374 	repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_OBJECT].ibuf = ibuf;
375 
376 	return request_object(obj, repo, obj_fd);
377 }
378 
379 
380 const struct got_error *
381 got_object_open(struct got_object **obj, struct got_repository *repo,
382     struct got_object_id *id)
383 {
384 	const struct got_error *err = NULL;
385 	char *path;
386 	int fd;
387 
388 	*obj = got_repo_get_cached_object(repo, id);
389 	if (*obj != NULL) {
390 		(*obj)->refcnt++;
391 		return NULL;
392 	}
393 
394 	err = open_packed_object(obj, id, repo);
395 	if (err && err->code != GOT_ERR_NO_OBJ)
396 		return err;
397 	if (*obj) {
398 		(*obj)->refcnt++;
399 		return got_repo_cache_object(repo, id, *obj);
400 	}
401 
402 	err = got_object_get_path(&path, id, repo);
403 	if (err)
404 		return err;
405 
406 	fd = open(path, O_RDONLY | O_NOFOLLOW);
407 	if (fd == -1) {
408 		if (errno == ENOENT)
409 			err = got_error_no_obj(id);
410 		else
411 			err = got_error_from_errno2("open", path);
412 		goto done;
413 	} else {
414 		err = read_object_header_privsep(obj, repo, fd);
415 		if (err)
416 			goto done;
417 		memcpy((*obj)->id.sha1, id->sha1, SHA1_DIGEST_LENGTH);
418 	}
419 
420 	(*obj)->refcnt++;
421 	err = got_repo_cache_object(repo, id, *obj);
422 done:
423 	free(path);
424 	return err;
425 
426 }
427 
428 const struct got_error *
429 got_object_open_by_id_str(struct got_object **obj, struct got_repository *repo,
430     const char *id_str)
431 {
432 	struct got_object_id id;
433 
434 	if (!got_parse_sha1_digest(id.sha1, id_str))
435 		return got_error_path(id_str, GOT_ERR_BAD_OBJ_ID_STR);
436 
437 	return got_object_open(obj, repo, &id);
438 }
439 
440 const struct got_error *
441 got_object_resolve_id_str(struct got_object_id **id,
442     struct got_repository *repo, const char *id_str)
443 {
444 	const struct got_error *err = NULL;
445 	struct got_object *obj;
446 
447 	err = got_object_open_by_id_str(&obj, repo, id_str);
448 	if (err)
449 		return err;
450 
451 	*id = got_object_id_dup(got_object_get_id(obj));
452 	got_object_close(obj);
453 	if (*id == NULL)
454 		return got_error_from_errno("got_object_id_dup");
455 
456 	return NULL;
457 }
458 
459 static const struct got_error *
460 request_packed_commit(struct got_commit_object **commit, struct got_pack *pack,
461     int pack_idx, struct got_object_id *id)
462 {
463 	const struct got_error *err = NULL;
464 
465 	err = got_privsep_send_commit_req(pack->privsep_child->ibuf, -1, id,
466 	    pack_idx);
467 	if (err)
468 		return err;
469 
470 	err = got_privsep_recv_commit(commit, pack->privsep_child->ibuf);
471 	if (err)
472 		return err;
473 
474 	(*commit)->flags |= GOT_COMMIT_FLAG_PACKED;
475 	return NULL;
476 }
477 
478 static const struct got_error *
479 read_packed_commit_privsep(struct got_commit_object **commit,
480     struct got_pack *pack, struct got_packidx *packidx, int idx,
481     struct got_object_id *id)
482 {
483 	const struct got_error *err = NULL;
484 
485 	if (pack->privsep_child)
486 		return request_packed_commit(commit, pack, idx, id);
487 
488 	err = start_pack_privsep_child(pack, packidx);
489 	if (err)
490 		return err;
491 
492 	return request_packed_commit(commit, pack, idx, id);
493 }
494 
495 static const struct got_error *
496 request_commit(struct got_commit_object **commit, struct got_repository *repo,
497     int fd)
498 {
499 	const struct got_error *err = NULL;
500 	struct imsgbuf *ibuf;
501 
502 	ibuf = repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_COMMIT].ibuf;
503 
504 	err = got_privsep_send_commit_req(ibuf, fd, NULL, -1);
505 	if (err)
506 		return err;
507 
508 	return got_privsep_recv_commit(commit, ibuf);
509 }
510 
511 static const struct got_error *
512 read_commit_privsep(struct got_commit_object **commit, int obj_fd,
513     struct got_repository *repo)
514 {
515 	const struct got_error *err;
516 	int imsg_fds[2];
517 	pid_t pid;
518 	struct imsgbuf *ibuf;
519 
520 	if (repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_COMMIT].imsg_fd != -1)
521 		return request_commit(commit, repo, obj_fd);
522 
523 	ibuf = calloc(1, sizeof(*ibuf));
524 	if (ibuf == NULL)
525 		return got_error_from_errno("calloc");
526 
527 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
528 		err = got_error_from_errno("socketpair");
529 		free(ibuf);
530 		return err;
531 	}
532 
533 	pid = fork();
534 	if (pid == -1) {
535 		err = got_error_from_errno("fork");
536 		free(ibuf);
537 		return err;
538 	}
539 	else if (pid == 0) {
540 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_COMMIT,
541 		    repo->path);
542 		/* not reached */
543 	}
544 
545 	if (close(imsg_fds[1]) != 0) {
546 		err = got_error_from_errno("close");
547 		free(ibuf);
548 		return err;
549 	}
550 	repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_COMMIT].imsg_fd =
551 	    imsg_fds[0];
552 	repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_COMMIT].pid = pid;
553 	imsg_init(ibuf, imsg_fds[0]);
554 	repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_COMMIT].ibuf = ibuf;
555 
556 	return request_commit(commit, repo, obj_fd);
557 }
558 
559 
560 static const struct got_error *
561 open_commit(struct got_commit_object **commit,
562     struct got_repository *repo, struct got_object_id *id, int check_cache)
563 {
564 	const struct got_error *err = NULL;
565 	struct got_packidx *packidx = NULL;
566 	int idx;
567 	char *path_packfile = NULL;
568 
569 	if (check_cache) {
570 		*commit = got_repo_get_cached_commit(repo, id);
571 		if (*commit != NULL) {
572 			(*commit)->refcnt++;
573 			return NULL;
574 		}
575 	} else
576 		*commit = NULL;
577 
578 	err = got_repo_search_packidx(&packidx, &idx, repo, id);
579 	if (err == NULL) {
580 		struct got_pack *pack = NULL;
581 
582 		err = get_packfile_path(&path_packfile, packidx);
583 		if (err)
584 			return err;
585 
586 		pack = got_repo_get_cached_pack(repo, path_packfile);
587 		if (pack == NULL) {
588 			err = got_repo_cache_pack(&pack, repo, path_packfile,
589 			    packidx);
590 			if (err)
591 				goto done;
592 		}
593 		err = read_packed_commit_privsep(commit, pack,
594 		    packidx, idx, id);
595 	} else if (err->code == GOT_ERR_NO_OBJ) {
596 		int fd;
597 
598 		err = open_loose_object(&fd, id, repo);
599 		if (err)
600 			return err;
601 		err = read_commit_privsep(commit, fd, repo);
602 	}
603 
604 	if (err == NULL) {
605 		(*commit)->refcnt++;
606 		err = got_repo_cache_commit(repo, id, *commit);
607 	}
608 done:
609 	free(path_packfile);
610 	return err;
611 }
612 
613 const struct got_error *
614 got_object_open_as_commit(struct got_commit_object **commit,
615     struct got_repository *repo, struct got_object_id *id)
616 {
617 	*commit = got_repo_get_cached_commit(repo, id);
618 	if (*commit != NULL) {
619 		(*commit)->refcnt++;
620 		return NULL;
621 	}
622 
623 	return open_commit(commit, repo, id, 0);
624 }
625 
626 const struct got_error *
627 got_object_commit_open(struct got_commit_object **commit,
628     struct got_repository *repo, struct got_object *obj)
629 {
630 	return open_commit(commit, repo, got_object_get_id(obj), 1);
631 }
632 
633 const struct got_error *
634 got_object_qid_alloc(struct got_object_qid **qid, struct got_object_id *id)
635 {
636 	const struct got_error *err = NULL;
637 
638 	*qid = calloc(1, sizeof(**qid));
639 	if (*qid == NULL)
640 		return got_error_from_errno("calloc");
641 
642 	(*qid)->id = got_object_id_dup(id);
643 	if ((*qid)->id == NULL) {
644 		err = got_error_from_errno("got_object_id_dup");
645 		got_object_qid_free(*qid);
646 		*qid = NULL;
647 		return err;
648 	}
649 
650 	return NULL;
651 }
652 
653 static const struct got_error *
654 request_packed_tree(struct got_tree_object **tree, struct got_pack *pack,
655     int pack_idx, struct got_object_id *id)
656 {
657 	const struct got_error *err = NULL;
658 
659 	err = got_privsep_send_tree_req(pack->privsep_child->ibuf, -1, id,
660 	    pack_idx);
661 	if (err)
662 		return err;
663 
664 	return got_privsep_recv_tree(tree, pack->privsep_child->ibuf);
665 }
666 
667 static const struct got_error *
668 read_packed_tree_privsep(struct got_tree_object **tree,
669     struct got_pack *pack, struct got_packidx *packidx, int idx,
670     struct got_object_id *id)
671 {
672 	const struct got_error *err = NULL;
673 
674 	if (pack->privsep_child)
675 		return request_packed_tree(tree, pack, idx, id);
676 
677 	err = start_pack_privsep_child(pack, packidx);
678 	if (err)
679 		return err;
680 
681 	return request_packed_tree(tree, pack, idx, id);
682 }
683 
684 static const struct got_error *
685 request_tree(struct got_tree_object **tree, struct got_repository *repo,
686     int fd)
687 {
688 	const struct got_error *err = NULL;
689 	struct imsgbuf *ibuf;
690 
691 	ibuf = repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_TREE].ibuf;
692 
693 	err = got_privsep_send_tree_req(ibuf, fd, NULL, -1);
694 	if (err)
695 		return err;
696 
697 	return got_privsep_recv_tree(tree, ibuf);
698 }
699 
700 const struct got_error *
701 read_tree_privsep(struct got_tree_object **tree, int obj_fd,
702     struct got_repository *repo)
703 {
704 	const struct got_error *err;
705 	int imsg_fds[2];
706 	pid_t pid;
707 	struct imsgbuf *ibuf;
708 
709 	if (repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_TREE].imsg_fd != -1)
710 		return request_tree(tree, repo, obj_fd);
711 
712 	ibuf = calloc(1, sizeof(*ibuf));
713 	if (ibuf == NULL)
714 		return got_error_from_errno("calloc");
715 
716 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
717 		err = got_error_from_errno("socketpair");
718 		free(ibuf);
719 		return err;
720 	}
721 
722 	pid = fork();
723 	if (pid == -1) {
724 		err = got_error_from_errno("fork");
725 		free(ibuf);
726 		return err;
727 	}
728 	else if (pid == 0) {
729 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_TREE,
730 		    repo->path);
731 		/* not reached */
732 	}
733 
734 	if (close(imsg_fds[1]) != 0) {
735 		err = got_error_from_errno("close");
736 		free(ibuf);
737 		return err;
738 	}
739 	repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_TREE].imsg_fd =
740 	    imsg_fds[0];
741 	repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_TREE].pid = pid;
742 	imsg_init(ibuf, imsg_fds[0]);
743 	repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_TREE].ibuf = ibuf;
744 
745 
746 	return request_tree(tree, repo, obj_fd);
747 }
748 
749 static const struct got_error *
750 open_tree(struct got_tree_object **tree, struct got_repository *repo,
751     struct got_object_id *id, int check_cache)
752 {
753 	const struct got_error *err = NULL;
754 	struct got_packidx *packidx = NULL;
755 	int idx;
756 	char *path_packfile = NULL;
757 
758 	if (check_cache) {
759 		*tree = got_repo_get_cached_tree(repo, id);
760 		if (*tree != NULL) {
761 			(*tree)->refcnt++;
762 			return NULL;
763 		}
764 	} else
765 		*tree = NULL;
766 
767 	err = got_repo_search_packidx(&packidx, &idx, repo, id);
768 	if (err == NULL) {
769 		struct got_pack *pack = NULL;
770 
771 		err = get_packfile_path(&path_packfile, packidx);
772 		if (err)
773 			return err;
774 
775 		pack = got_repo_get_cached_pack(repo, path_packfile);
776 		if (pack == NULL) {
777 			err = got_repo_cache_pack(&pack, repo, path_packfile,
778 			    packidx);
779 			if (err)
780 				goto done;
781 		}
782 		err = read_packed_tree_privsep(tree, pack,
783 		    packidx, idx, id);
784 	} else if (err->code == GOT_ERR_NO_OBJ) {
785 		int fd;
786 
787 		err = open_loose_object(&fd, id, repo);
788 		if (err)
789 			return err;
790 		err = read_tree_privsep(tree, fd, repo);
791 	}
792 
793 	if (err == NULL) {
794 		(*tree)->refcnt++;
795 		err = got_repo_cache_tree(repo, id, *tree);
796 	}
797 done:
798 	free(path_packfile);
799 	return err;
800 }
801 
802 const struct got_error *
803 got_object_open_as_tree(struct got_tree_object **tree,
804     struct got_repository *repo, struct got_object_id *id)
805 {
806 	*tree = got_repo_get_cached_tree(repo, id);
807 	if (*tree != NULL) {
808 		(*tree)->refcnt++;
809 		return NULL;
810 	}
811 
812 	return open_tree(tree, repo, id, 0);
813 }
814 
815 const struct got_error *
816 got_object_tree_open(struct got_tree_object **tree,
817     struct got_repository *repo, struct got_object *obj)
818 {
819 	return open_tree(tree, repo, got_object_get_id(obj), 1);
820 }
821 
822 int
823 got_object_tree_get_nentries(struct got_tree_object *tree)
824 {
825 	return tree->nentries;
826 }
827 
828 struct got_tree_entry *
829 got_object_tree_get_first_entry(struct got_tree_object *tree)
830 {
831 	return got_object_tree_get_entry(tree, 0);
832 }
833 
834 struct got_tree_entry *
835 got_object_tree_get_last_entry(struct got_tree_object *tree)
836 {
837 	return got_object_tree_get_entry(tree, tree->nentries - 1);
838 }
839 
840 struct got_tree_entry *
841 got_object_tree_get_entry(struct got_tree_object *tree, int i)
842 {
843 	if (i < 0 || i >= tree->nentries)
844 		return NULL;
845 	return &tree->entries[i];
846 }
847 
848 mode_t
849 got_tree_entry_get_mode(struct got_tree_entry *te)
850 {
851 	return te->mode;
852 }
853 
854 const char *
855 got_tree_entry_get_name(struct got_tree_entry *te)
856 {
857 	return &te->name[0];
858 }
859 
860 struct got_object_id *
861 got_tree_entry_get_id(struct got_tree_entry *te)
862 {
863 	return &te->id;
864 }
865 
866 int
867 got_tree_entry_get_index(struct got_tree_entry *te)
868 {
869 	return te->idx;
870 }
871 
872 struct got_tree_entry *
873 got_tree_entry_get_next(struct got_tree_object *tree,
874     struct got_tree_entry *te)
875 {
876 	return got_object_tree_get_entry(tree, te->idx + 1);
877 }
878 
879 struct got_tree_entry *
880 got_tree_entry_get_prev(struct got_tree_object *tree,
881     struct got_tree_entry *te)
882 {
883 	return got_object_tree_get_entry(tree, te->idx - 1);
884 }
885 
886 static const struct got_error *
887 request_packed_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen, int outfd,
888     struct got_pack *pack, struct got_packidx *packidx, int idx,
889     struct got_object_id *id)
890 {
891 	const struct got_error *err = NULL;
892 	int outfd_child;
893 	int basefd, accumfd; /* temporary files for delta application */
894 
895 	basefd = got_opentempfd();
896 	if (basefd == -1)
897 		return got_error_from_errno("got_opentempfd");
898 	accumfd = got_opentempfd();
899 	if (accumfd == -1)
900 		return got_error_from_errno("got_opentempfd");
901 
902 	outfd_child = dup(outfd);
903 	if (outfd_child == -1)
904 		return got_error_from_errno("dup");
905 
906 	err = got_privsep_send_blob_req(pack->privsep_child->ibuf, -1, id, idx);
907 	if (err)
908 		return err;
909 
910 	err = got_privsep_send_blob_outfd(pack->privsep_child->ibuf,
911 	    outfd_child);
912 	if (err) {
913 		close(basefd);
914 		close(accumfd);
915 		return err;
916 	}
917 
918 	err = got_privsep_send_tmpfd(pack->privsep_child->ibuf,
919 	    basefd);
920 	if (err) {
921 		close(accumfd);
922 		return err;
923 	}
924 
925 	err = got_privsep_send_tmpfd(pack->privsep_child->ibuf,
926 	    accumfd);
927 	if (err)
928 		return err;
929 
930 	err = got_privsep_recv_blob(outbuf, size, hdrlen,
931 	    pack->privsep_child->ibuf);
932 	if (err)
933 		return err;
934 
935 	if (lseek(outfd, SEEK_SET, 0) == -1)
936 		err = got_error_from_errno("lseek");
937 
938 	return err;
939 }
940 
941 static const struct got_error *
942 read_packed_blob_privsep(uint8_t **outbuf, size_t *size, size_t *hdrlen,
943     int outfd, struct got_pack *pack, struct got_packidx *packidx, int idx,
944     struct got_object_id *id)
945 {
946 	const struct got_error *err = NULL;
947 
948 	if (pack->privsep_child == NULL) {
949 		err = start_pack_privsep_child(pack, packidx);
950 		if (err)
951 			return err;
952 	}
953 
954 	return request_packed_blob(outbuf, size, hdrlen, outfd, pack, packidx,
955 	    idx, id);
956 }
957 
958 static const struct got_error *
959 request_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen, int outfd,
960     int infd, struct imsgbuf *ibuf)
961 {
962 	const struct got_error *err = NULL;
963 	int outfd_child;
964 
965 	outfd_child = dup(outfd);
966 	if (outfd_child == -1)
967 		return got_error_from_errno("dup");
968 
969 	err = got_privsep_send_blob_req(ibuf, infd, NULL, -1);
970 	if (err)
971 		return err;
972 
973 	err = got_privsep_send_blob_outfd(ibuf, outfd_child);
974 	if (err)
975 		return err;
976 
977 	err = got_privsep_recv_blob(outbuf, size, hdrlen, ibuf);
978 	if (err)
979 		return err;
980 
981 	if (lseek(outfd, SEEK_SET, 0) == -1)
982 		return got_error_from_errno("lseek");
983 
984 	return err;
985 }
986 
987 static const struct got_error *
988 read_blob_privsep(uint8_t **outbuf, size_t *size, size_t *hdrlen,
989     int outfd, int infd, struct got_repository *repo)
990 {
991 	const struct got_error *err;
992 	int imsg_fds[2];
993 	pid_t pid;
994 	struct imsgbuf *ibuf;
995 
996 	if (repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_BLOB].imsg_fd != -1) {
997 		ibuf = repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_BLOB].ibuf;
998 		return request_blob(outbuf, size, hdrlen, outfd, infd, ibuf);
999 	}
1000 
1001 	ibuf = calloc(1, sizeof(*ibuf));
1002 	if (ibuf == NULL)
1003 		return got_error_from_errno("calloc");
1004 
1005 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
1006 		err = got_error_from_errno("socketpair");
1007 		free(ibuf);
1008 		return err;
1009 	}
1010 
1011 	pid = fork();
1012 	if (pid == -1) {
1013 		err = got_error_from_errno("fork");
1014 		free(ibuf);
1015 		return err;
1016 	}
1017 	else if (pid == 0) {
1018 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_BLOB,
1019 		    repo->path);
1020 		/* not reached */
1021 	}
1022 
1023 	if (close(imsg_fds[1]) != 0) {
1024 		err = got_error_from_errno("close");
1025 		free(ibuf);
1026 		return err;
1027 	}
1028 	repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_BLOB].imsg_fd =
1029 	    imsg_fds[0];
1030 	repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_BLOB].pid = pid;
1031 	imsg_init(ibuf, imsg_fds[0]);
1032 	repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_BLOB].ibuf = ibuf;
1033 
1034 	return request_blob(outbuf, size, hdrlen, outfd, infd, ibuf);
1035 }
1036 
1037 static const struct got_error *
1038 open_blob(struct got_blob_object **blob, struct got_repository *repo,
1039     struct got_object_id *id, size_t blocksize)
1040 {
1041 	const struct got_error *err = NULL;
1042 	struct got_packidx *packidx = NULL;
1043 	int idx;
1044 	char *path_packfile = NULL;
1045 	uint8_t *outbuf;
1046 	int outfd;
1047 	size_t size, hdrlen;
1048 	struct stat sb;
1049 
1050 	*blob = calloc(1, sizeof(**blob));
1051 	if (*blob == NULL)
1052 		return got_error_from_errno("calloc");
1053 
1054 	outfd = got_opentempfd();
1055 	if (outfd == -1)
1056 		return got_error_from_errno("got_opentempfd");
1057 
1058 	(*blob)->read_buf = malloc(blocksize);
1059 	if ((*blob)->read_buf == NULL) {
1060 		err = got_error_from_errno("malloc");
1061 		goto done;
1062 	}
1063 
1064 	err = got_repo_search_packidx(&packidx, &idx, repo, id);
1065 	if (err == NULL) {
1066 		struct got_pack *pack = NULL;
1067 
1068 		err = get_packfile_path(&path_packfile, packidx);
1069 		if (err)
1070 			goto done;
1071 
1072 		pack = got_repo_get_cached_pack(repo, path_packfile);
1073 		if (pack == NULL) {
1074 			err = got_repo_cache_pack(&pack, repo, path_packfile,
1075 			    packidx);
1076 			if (err)
1077 				goto done;
1078 		}
1079 		err = read_packed_blob_privsep(&outbuf, &size, &hdrlen, outfd,
1080 		    pack, packidx, idx, id);
1081 	} else if (err->code == GOT_ERR_NO_OBJ) {
1082 		int infd;
1083 
1084 		err = open_loose_object(&infd, id, repo);
1085 		if (err)
1086 			goto done;
1087 		err = read_blob_privsep(&outbuf, &size, &hdrlen, outfd, infd,
1088 		    repo);
1089 	}
1090 	if (err)
1091 		goto done;
1092 
1093 	if (hdrlen > size) {
1094 		err = got_error(GOT_ERR_BAD_OBJ_HDR);
1095 		goto done;
1096 	}
1097 
1098 	if (outbuf) {
1099 		if (close(outfd) != 0 && err == NULL)
1100 			err = got_error_from_errno("close");
1101 		outfd = -1;
1102 		(*blob)->f = fmemopen(outbuf, size, "rb");
1103 		if ((*blob)->f == NULL) {
1104 			err = got_error_from_errno("fmemopen");
1105 			free(outbuf);
1106 			goto done;
1107 		}
1108 		(*blob)->data = outbuf;
1109 	} else {
1110 		if (fstat(outfd, &sb) == -1) {
1111 			err = got_error_from_errno("fstat");
1112 			goto done;
1113 		}
1114 
1115 		if (sb.st_size != size) {
1116 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1117 			goto done;
1118 		}
1119 
1120 		(*blob)->f = fdopen(outfd, "rb");
1121 		if ((*blob)->f == NULL) {
1122 			err = got_error_from_errno("fdopen");
1123 			close(outfd);
1124 			outfd = -1;
1125 			goto done;
1126 		}
1127 	}
1128 
1129 	(*blob)->hdrlen = hdrlen;
1130 	(*blob)->blocksize = blocksize;
1131 	memcpy(&(*blob)->id.sha1, id->sha1, SHA1_DIGEST_LENGTH);
1132 
1133 done:
1134 	free(path_packfile);
1135 	if (err) {
1136 		if (*blob) {
1137 			got_object_blob_close(*blob);
1138 			*blob = NULL;
1139 		} else if (outfd != -1)
1140 			close(outfd);
1141 	}
1142 	return err;
1143 }
1144 
1145 const struct got_error *
1146 got_object_open_as_blob(struct got_blob_object **blob,
1147     struct got_repository *repo, struct got_object_id *id,
1148     size_t blocksize)
1149 {
1150 	return open_blob(blob, repo, id, blocksize);
1151 }
1152 
1153 const struct got_error *
1154 got_object_blob_open(struct got_blob_object **blob,
1155     struct got_repository *repo, struct got_object *obj, size_t blocksize)
1156 {
1157 	return open_blob(blob, repo, got_object_get_id(obj), blocksize);
1158 }
1159 
1160 const struct got_error *
1161 got_object_blob_close(struct got_blob_object *blob)
1162 {
1163 	const struct got_error *err = NULL;
1164 	free(blob->read_buf);
1165 	if (blob->f && fclose(blob->f) != 0)
1166 		err = got_error_from_errno("fclose");
1167 	free(blob->data);
1168 	free(blob);
1169 	return err;
1170 }
1171 
1172 char *
1173 got_object_blob_id_str(struct got_blob_object *blob, char *buf, size_t size)
1174 {
1175 	return got_sha1_digest_to_str(blob->id.sha1, buf, size);
1176 }
1177 
1178 size_t
1179 got_object_blob_get_hdrlen(struct got_blob_object *blob)
1180 {
1181 	return blob->hdrlen;
1182 }
1183 
1184 const uint8_t *
1185 got_object_blob_get_read_buf(struct got_blob_object *blob)
1186 {
1187 	return blob->read_buf;
1188 }
1189 
1190 const struct got_error *
1191 got_object_blob_read_block(size_t *outlenp, struct got_blob_object *blob)
1192 {
1193 	size_t n;
1194 
1195 	n = fread(blob->read_buf, 1, blob->blocksize, blob->f);
1196 	if (n == 0 && ferror(blob->f))
1197 		return got_ferror(blob->f, GOT_ERR_IO);
1198 	*outlenp = n;
1199 	return NULL;
1200 }
1201 
1202 const struct got_error *
1203 got_object_blob_dump_to_file(size_t *filesize, int *nlines,
1204     off_t **line_offsets, FILE *outfile, struct got_blob_object *blob)
1205 {
1206 	const struct got_error *err = NULL;
1207 	size_t n, len, hdrlen;
1208 	const uint8_t *buf;
1209 	int i;
1210 	size_t noffsets = 0;
1211 	off_t off = 0, total_len = 0;
1212 
1213 	if (line_offsets)
1214 		*line_offsets = NULL;
1215 	if (filesize)
1216 		*filesize = 0;
1217 	if (nlines)
1218 		*nlines = 0;
1219 
1220 	hdrlen = got_object_blob_get_hdrlen(blob);
1221 	do {
1222 		err = got_object_blob_read_block(&len, blob);
1223 		if (err)
1224 			return err;
1225 		if (len == 0)
1226 			break;
1227 		buf = got_object_blob_get_read_buf(blob);
1228 		i = hdrlen;
1229 		if (line_offsets && nlines) {
1230 			if (*line_offsets == NULL) {
1231 				/* Have some data but perhaps no '\n'. */
1232 				noffsets = 1;
1233 				*nlines = 1;
1234 				*line_offsets = calloc(1, sizeof(**line_offsets));
1235 				if (*line_offsets == NULL)
1236 					return got_error_from_errno("calloc");
1237 
1238 				/* Skip forward over end of first line. */
1239 				while (i < len) {
1240 					if (buf[i] == '\n')
1241 						break;
1242 					i++;
1243 				}
1244 			}
1245 			/* Scan '\n' offsets in remaining chunk of data. */
1246 			while (i < len) {
1247 				if (buf[i] != '\n') {
1248 					i++;
1249 					continue;
1250 				}
1251 				(*nlines)++;
1252 				if (noffsets < *nlines) {
1253 					off_t *o = recallocarray(*line_offsets,
1254 					    noffsets, *nlines,
1255 					    sizeof(**line_offsets));
1256 					if (o == NULL) {
1257 						free(*line_offsets);
1258 						*line_offsets = NULL;
1259 						return got_error_from_errno(
1260 						    "recallocarray");
1261 					}
1262 					*line_offsets = o;
1263 					noffsets = *nlines;
1264 				}
1265 				off = total_len + i - hdrlen + 1;
1266 				(*line_offsets)[*nlines - 1] = off;
1267 				i++;
1268 			}
1269 		}
1270 		/* Skip blob object header first time around. */
1271 		n = fwrite(buf + hdrlen, 1, len - hdrlen, outfile);
1272 		if (n != len - hdrlen)
1273 			return got_ferror(outfile, GOT_ERR_IO);
1274 		total_len += len - hdrlen;
1275 		hdrlen = 0;
1276 	} while (len != 0);
1277 
1278 	if (fflush(outfile) != 0)
1279 		return got_error_from_errno("fflush");
1280 	rewind(outfile);
1281 
1282 	if (filesize)
1283 		*filesize = total_len;
1284 
1285 	return NULL;
1286 }
1287 
1288 static const struct got_error *
1289 request_packed_tag(struct got_tag_object **tag, struct got_pack *pack,
1290     int pack_idx, struct got_object_id *id)
1291 {
1292 	const struct got_error *err = NULL;
1293 
1294 	err = got_privsep_send_tag_req(pack->privsep_child->ibuf, -1, id,
1295 	    pack_idx);
1296 	if (err)
1297 		return err;
1298 
1299 	return got_privsep_recv_tag(tag, pack->privsep_child->ibuf);
1300 }
1301 
1302 static const struct got_error *
1303 read_packed_tag_privsep(struct got_tag_object **tag,
1304     struct got_pack *pack, struct got_packidx *packidx, int idx,
1305     struct got_object_id *id)
1306 {
1307 	const struct got_error *err = NULL;
1308 
1309 	if (pack->privsep_child)
1310 		return request_packed_tag(tag, pack, idx, id);
1311 
1312 	err = start_pack_privsep_child(pack, packidx);
1313 	if (err)
1314 		return err;
1315 
1316 	return request_packed_tag(tag, pack, idx, id);
1317 }
1318 
1319 static const struct got_error *
1320 request_tag(struct got_tag_object **tag, struct got_repository *repo,
1321     int fd)
1322 {
1323 	const struct got_error *err = NULL;
1324 	struct imsgbuf *ibuf;
1325 
1326 	ibuf = repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_TAG].ibuf;
1327 
1328 	err = got_privsep_send_tag_req(ibuf, fd, NULL, -1);
1329 	if (err)
1330 		return err;
1331 
1332 	return got_privsep_recv_tag(tag, ibuf);
1333 }
1334 
1335 static const struct got_error *
1336 read_tag_privsep(struct got_tag_object **tag, int obj_fd,
1337     struct got_repository *repo)
1338 {
1339 	const struct got_error *err;
1340 	int imsg_fds[2];
1341 	pid_t pid;
1342 	struct imsgbuf *ibuf;
1343 
1344 	if (repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_TAG].imsg_fd != -1)
1345 		return request_tag(tag, repo, obj_fd);
1346 
1347 	ibuf = calloc(1, sizeof(*ibuf));
1348 	if (ibuf == NULL)
1349 		return got_error_from_errno("calloc");
1350 
1351 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
1352 		err = got_error_from_errno("socketpair");
1353 		free(ibuf);
1354 		return err;
1355 	}
1356 
1357 	pid = fork();
1358 	if (pid == -1) {
1359 		err = got_error_from_errno("fork");
1360 		free(ibuf);
1361 		return err;
1362 	}
1363 	else if (pid == 0) {
1364 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_TAG,
1365 		    repo->path);
1366 		/* not reached */
1367 	}
1368 
1369 	if (close(imsg_fds[1]) != 0) {
1370 		err = got_error_from_errno("close");
1371 		free(ibuf);
1372 		return err;
1373 	}
1374 	repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_TAG].imsg_fd =
1375 	    imsg_fds[0];
1376 	repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_TAG].pid = pid;
1377 	imsg_init(ibuf, imsg_fds[0]);
1378 	repo->privsep_children[GOT_REPO_PRIVSEP_CHILD_TAG].ibuf = ibuf;
1379 
1380 	return request_tag(tag, repo, obj_fd);
1381 }
1382 
1383 static const struct got_error *
1384 open_tag(struct got_tag_object **tag, struct got_repository *repo,
1385     struct got_object_id *id, int check_cache)
1386 {
1387 	const struct got_error *err = NULL;
1388 	struct got_packidx *packidx = NULL;
1389 	int idx;
1390 	char *path_packfile = NULL;
1391 	struct got_object *obj = NULL;
1392 	int obj_type = GOT_OBJ_TYPE_ANY;
1393 
1394 	if (check_cache) {
1395 		*tag = got_repo_get_cached_tag(repo, id);
1396 		if (*tag != NULL) {
1397 			(*tag)->refcnt++;
1398 			return NULL;
1399 		}
1400 	} else
1401 		*tag = NULL;
1402 
1403 	err = got_repo_search_packidx(&packidx, &idx, repo, id);
1404 	if (err == NULL) {
1405 		struct got_pack *pack = NULL;
1406 
1407 		err = get_packfile_path(&path_packfile, packidx);
1408 		if (err)
1409 			return err;
1410 
1411 		pack = got_repo_get_cached_pack(repo, path_packfile);
1412 		if (pack == NULL) {
1413 			err = got_repo_cache_pack(&pack, repo, path_packfile,
1414 			    packidx);
1415 			if (err)
1416 				goto done;
1417 		}
1418 
1419 		/* Beware of "lightweight" tags: Check object type first. */
1420 		err = read_packed_object_privsep(&obj, repo, pack, packidx,
1421 		    idx, id);
1422 		if (err)
1423 			goto done;
1424 		obj_type = obj->type;
1425 		got_object_close(obj);
1426 		if (obj_type != GOT_OBJ_TYPE_TAG) {
1427 			err = got_error(GOT_ERR_OBJ_TYPE);
1428 			goto done;
1429 		}
1430 		err = read_packed_tag_privsep(tag, pack, packidx, idx, id);
1431 	} else if (err->code == GOT_ERR_NO_OBJ) {
1432 		int fd;
1433 
1434 		err = open_loose_object(&fd, id, repo);
1435 		if (err)
1436 			return err;
1437 		err = read_object_header_privsep(&obj, repo, fd);
1438 		if (err)
1439 			return err;
1440 		obj_type = obj->type;
1441 		got_object_close(obj);
1442 		if (obj_type != GOT_OBJ_TYPE_TAG)
1443 			return got_error(GOT_ERR_OBJ_TYPE);
1444 
1445 		err = open_loose_object(&fd, id, repo);
1446 		if (err)
1447 			return err;
1448 		err = read_tag_privsep(tag, fd, repo);
1449 	}
1450 
1451 	if (err == NULL) {
1452 		(*tag)->refcnt++;
1453 		err = got_repo_cache_tag(repo, id, *tag);
1454 	}
1455 done:
1456 	free(path_packfile);
1457 	return err;
1458 }
1459 
1460 const struct got_error *
1461 got_object_open_as_tag(struct got_tag_object **tag,
1462     struct got_repository *repo, struct got_object_id *id)
1463 {
1464 	*tag = got_repo_get_cached_tag(repo, id);
1465 	if (*tag != NULL) {
1466 		(*tag)->refcnt++;
1467 		return NULL;
1468 	}
1469 
1470 	return open_tag(tag, repo, id, 0);
1471 }
1472 
1473 const struct got_error *
1474 got_object_tag_open(struct got_tag_object **tag,
1475     struct got_repository *repo, struct got_object *obj)
1476 {
1477 	return open_tag(tag, repo, got_object_get_id(obj), 1);
1478 }
1479 
1480 const char *
1481 got_object_tag_get_name(struct got_tag_object *tag)
1482 {
1483 	return tag->tag;
1484 }
1485 
1486 int
1487 got_object_tag_get_object_type(struct got_tag_object *tag)
1488 {
1489 	return tag->obj_type;
1490 }
1491 
1492 struct got_object_id *
1493 got_object_tag_get_object_id(struct got_tag_object *tag)
1494 {
1495 	return &tag->id;
1496 }
1497 
1498 time_t
1499 got_object_tag_get_tagger_time(struct got_tag_object *tag)
1500 {
1501 	return tag->tagger_time;
1502 }
1503 
1504 time_t
1505 got_object_tag_get_tagger_gmtoff(struct got_tag_object *tag)
1506 {
1507 	return tag->tagger_gmtoff;
1508 }
1509 
1510 const char *
1511 got_object_tag_get_tagger(struct got_tag_object *tag)
1512 {
1513 	return tag->tagger;
1514 }
1515 
1516 const char *
1517 got_object_tag_get_message(struct got_tag_object *tag)
1518 {
1519 	return tag->tagmsg;
1520 }
1521 
1522 static struct got_tree_entry *
1523 find_entry_by_name(struct got_tree_object *tree, const char *name, size_t len)
1524 {
1525 	int i;
1526 
1527 	/* Note that tree entries are sorted in strncmp() order. */
1528 	for (i = 0; i < tree->nentries; i++) {
1529 		struct got_tree_entry *te = &tree->entries[i];
1530 		int cmp = strncmp(te->name, name, len);
1531 		if (cmp < 0)
1532 			continue;
1533 		if (cmp > 0)
1534 			break;
1535 		if (te->name[len] == '\0')
1536 			return te;
1537 	}
1538 	return NULL;
1539 }
1540 
1541 struct got_tree_entry *
1542 got_object_tree_find_entry(struct got_tree_object *tree, const char *name)
1543 {
1544 	return find_entry_by_name(tree, name, strlen(name));
1545 }
1546 
1547 const struct got_error *
1548 got_object_id_by_path(struct got_object_id **id, struct got_repository *repo,
1549     struct got_object_id *commit_id, const char *path)
1550 {
1551 	const struct got_error *err = NULL;
1552 	struct got_commit_object *commit = NULL;
1553 	struct got_tree_object *tree = NULL;
1554 	struct got_tree_entry *te = NULL;
1555 	const char *seg, *s;
1556 	size_t seglen;
1557 
1558 	*id = NULL;
1559 
1560 	err = got_object_open_as_commit(&commit, repo, commit_id);
1561 	if (err)
1562 		goto done;
1563 
1564 	/* Handle opening of root of commit's tree. */
1565 	if (got_path_is_root_dir(path)) {
1566 		*id = got_object_id_dup(commit->tree_id);
1567 		if (*id == NULL)
1568 			err = got_error_from_errno("got_object_id_dup");
1569 		goto done;
1570 	}
1571 
1572 	err = got_object_open_as_tree(&tree, repo, commit->tree_id);
1573 	if (err)
1574 		goto done;
1575 
1576 	s = path;
1577 	while (s[0] == '/')
1578 		s++;
1579 	seg = s;
1580 	seglen = 0;
1581 	while (*s) {
1582 		struct got_tree_object *next_tree;
1583 
1584 		if (*s != '/') {
1585 			s++;
1586 			seglen++;
1587 			if (*s)
1588 				continue;
1589 		}
1590 
1591 		te = find_entry_by_name(tree, seg, seglen);
1592 		if (te == NULL) {
1593 			err = got_error(GOT_ERR_NO_TREE_ENTRY);
1594 			goto done;
1595 		}
1596 
1597 		if (*s == '\0')
1598 			break;
1599 
1600 		seg = s + 1;
1601 		seglen = 0;
1602 		s++;
1603 		if (*s) {
1604 			err = got_object_open_as_tree(&next_tree, repo,
1605 			    &te->id);
1606 			te = NULL;
1607 			if (err)
1608 				goto done;
1609 			got_object_tree_close(tree);
1610 			tree = next_tree;
1611 		}
1612 	}
1613 
1614 	if (te) {
1615 		*id = got_object_id_dup(&te->id);
1616 		if (*id == NULL)
1617 			return got_error_from_errno("got_object_id_dup");
1618 	} else
1619 		err = got_error(GOT_ERR_NO_TREE_ENTRY);
1620 done:
1621 	if (commit)
1622 		got_object_commit_close(commit);
1623 	if (tree)
1624 		got_object_tree_close(tree);
1625 	return err;
1626 }
1627 
1628 const struct got_error *
1629 got_object_tree_path_changed(int *changed,
1630     struct got_tree_object *tree01, struct got_tree_object *tree02,
1631     const char *path, struct got_repository *repo)
1632 {
1633 	const struct got_error *err = NULL;
1634 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
1635 	struct got_tree_entry *te1 = NULL, *te2 = NULL;
1636 	const char *seg, *s;
1637 	size_t seglen;
1638 
1639 	*changed = 0;
1640 
1641 	/* We not do support comparing the root path. */
1642 	if (got_path_is_root_dir(path))
1643 		return got_error_path(path, GOT_ERR_BAD_PATH);
1644 
1645 	tree1 = tree01;
1646 	tree2 = tree02;
1647 	s = path;
1648 	while (*s == '/')
1649 		s++;
1650 	seg = s;
1651 	seglen = 0;
1652 	while (*s) {
1653 		struct got_tree_object *next_tree1, *next_tree2;
1654 
1655 		if (*s != '/') {
1656 			s++;
1657 			seglen++;
1658 			if (*s)
1659 				continue;
1660 		}
1661 
1662 		te1 = find_entry_by_name(tree1, seg, seglen);
1663 		if (te1 == NULL) {
1664 			err = got_error(GOT_ERR_NO_OBJ);
1665 			goto done;
1666 		}
1667 
1668 		te2 = find_entry_by_name(tree2, seg, seglen);
1669 		if (te2 == NULL) {
1670 			*changed = 1;
1671 			goto done;
1672 		}
1673 
1674 		if (te1->mode != te2->mode) {
1675 			*changed = 1;
1676 			goto done;
1677 		}
1678 
1679 		if (got_object_id_cmp(&te1->id, &te2->id) == 0) {
1680 			*changed = 0;
1681 			goto done;
1682 		}
1683 
1684 		if (*s == '\0') { /* final path element */
1685 			*changed = 1;
1686 			goto done;
1687 		}
1688 
1689 		seg = s + 1;
1690 		s++;
1691 		seglen = 0;
1692 		if (*s) {
1693 			err = got_object_open_as_tree(&next_tree1, repo,
1694 			    &te1->id);
1695 			te1 = NULL;
1696 			if (err)
1697 				goto done;
1698 			if (tree1 != tree01)
1699 				got_object_tree_close(tree1);
1700 			tree1 = next_tree1;
1701 
1702 			err = got_object_open_as_tree(&next_tree2, repo,
1703 			    &te2->id);
1704 			te2 = NULL;
1705 			if (err)
1706 				goto done;
1707 			if (tree2 != tree02)
1708 				got_object_tree_close(tree2);
1709 			tree2 = next_tree2;
1710 		}
1711 	}
1712 done:
1713 	if (tree1 && tree1 != tree01)
1714 		got_object_tree_close(tree1);
1715 	if (tree2 && tree2 != tree02)
1716 		got_object_tree_close(tree2);
1717 	return err;
1718 }
1719 
1720 const struct got_error *
1721 got_object_tree_entry_dup(struct got_tree_entry **new_te,
1722     struct got_tree_entry *te)
1723 {
1724 	const struct got_error *err = NULL;
1725 
1726 	*new_te = calloc(1, sizeof(**new_te));
1727 	if (*new_te == NULL)
1728 		return got_error_from_errno("calloc");
1729 
1730 	(*new_te)->mode = te->mode;
1731 	memcpy((*new_te)->name, te->name, sizeof((*new_te)->name));
1732 	memcpy(&(*new_te)->id, &te->id, sizeof((*new_te)->id));
1733 	return err;
1734 }
1735 
1736 int
1737 got_object_tree_entry_is_submodule(struct got_tree_entry *te)
1738 {
1739 	return (te->mode & S_IFMT) == (S_IFDIR | S_IFLNK);
1740 }
1741 
1742 const struct got_error *
1743 got_traverse_packed_commits(struct got_object_id_queue *traversed_commits,
1744     struct got_object_id *commit_id, const char *path,
1745     struct got_repository *repo)
1746 {
1747 	const struct got_error *err = NULL;
1748 	struct got_pack *pack = NULL;
1749 	struct got_packidx *packidx = NULL;
1750 	char *path_packfile = NULL;
1751 	struct got_commit_object *changed_commit = NULL;
1752 	struct got_object_id *changed_commit_id = NULL;
1753 	int idx;
1754 
1755 	err = got_repo_search_packidx(&packidx, &idx, repo, commit_id);
1756 	if (err) {
1757 		if (err->code != GOT_ERR_NO_OBJ)
1758 			return err;
1759 		return NULL;
1760 	}
1761 
1762 	err = get_packfile_path(&path_packfile, packidx);
1763 	if (err)
1764 		return err;
1765 
1766 	pack = got_repo_get_cached_pack(repo, path_packfile);
1767 	if (pack == NULL) {
1768 		err = got_repo_cache_pack(&pack, repo, path_packfile, packidx);
1769 		if (err)
1770 			goto done;
1771 	}
1772 
1773 	if (pack->privsep_child == NULL) {
1774 		err = start_pack_privsep_child(pack, packidx);
1775 		if (err)
1776 			goto done;
1777 	}
1778 
1779 	err = got_privsep_send_commit_traversal_request(
1780 	    pack->privsep_child->ibuf, commit_id, idx, path);
1781 	if (err)
1782 		goto done;
1783 
1784 	err = got_privsep_recv_traversed_commits(&changed_commit,
1785 	    &changed_commit_id, traversed_commits, pack->privsep_child->ibuf);
1786 	if (err)
1787 		goto done;
1788 
1789 	if (changed_commit) {
1790 		/*
1791 		 * Cache the commit in which the path was changed.
1792 		 * This commit might be opened again soon.
1793 		 */
1794 		changed_commit->refcnt++;
1795 		err = got_repo_cache_commit(repo, changed_commit_id,
1796 		    changed_commit);
1797 		got_object_commit_close(changed_commit);
1798 	}
1799 done:
1800 	free(path_packfile);
1801 	free(changed_commit_id);
1802 	return err;
1803 }