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Date:: Sat Feb 29 08:05:11 2020 UTC
Message:: remove GOT_ERR_NOT_ABSPATH and fix existing users to deal with absolute paths
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1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/queue.h>
19 #include <sys/uio.h>
20 #include <sys/time.h>
21 #include <sys/syslimits.h>
22 #include <sys/mman.h>
23 
24 #include <limits.h>
25 #include <signal.h>
26 #include <stdint.h>
27 #include <imsg.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <sha1.h>
32 #include <zlib.h>
33 
34 #include "got_error.h"
35 #include "got_object.h"
36 #include "got_path.h"
37 
38 #include "got_lib_delta.h"
39 #include "got_lib_delta_cache.h"
40 #include "got_lib_object.h"
41 #include "got_lib_object_cache.h"
42 #include "got_lib_object_parse.h"
43 #include "got_lib_privsep.h"
44 #include "got_lib_pack.h"
45 
46 static volatile sig_atomic_t sigint_received;
47 
48 static void
49 catch_sigint(int signo)
50 {
51 	sigint_received = 1;
52 }
53 
54 static const struct got_error *
55 open_object(struct got_object **obj, struct got_pack *pack,
56     struct got_packidx *packidx, int idx, struct got_object_id *id,
57     struct got_object_cache *objcache)
58 {
59 	const struct got_error *err;
60 
61 	err = got_packfile_open_object(obj, pack, packidx, idx, id);
62 	if (err)
63 		return err;
64 	(*obj)->refcnt++;
65 
66 	err = got_object_cache_add(objcache, id, *obj);
67 	if (err) {
68 		if (err->code == GOT_ERR_OBJ_EXISTS ||
69 		    err->code == GOT_ERR_OBJ_TOO_LARGE)
70 			err = NULL;
71 		return err;
72 	}
73 	(*obj)->refcnt++;
74 	return NULL;
75 }
76 
77 static const struct got_error *
78 object_request(struct imsg *imsg, struct imsgbuf *ibuf, struct got_pack *pack,
79     struct got_packidx *packidx, struct got_object_cache *objcache)
80 {
81 	const struct got_error *err = NULL;
82 	struct got_imsg_packed_object iobj;
83 	struct got_object *obj;
84 	struct got_object_id id;
85 	size_t datalen;
86 
87 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
88 	if (datalen != sizeof(iobj))
89 		return got_error(GOT_ERR_PRIVSEP_LEN);
90 	memcpy(&iobj, imsg->data, sizeof(iobj));
91 	memcpy(id.sha1, iobj.id, SHA1_DIGEST_LENGTH);
92 
93 	obj = got_object_cache_get(objcache, &id);
94 	if (obj) {
95 		obj->refcnt++;
96 	} else {
97 		err = open_object(&obj, pack, packidx, iobj.idx, &id,
98 		    objcache);
99 		if (err)
100 			goto done;
101 	}
102 
103 	err = got_privsep_send_obj(ibuf, obj);
104 done:
105 	got_object_close(obj);
106 	return err;
107 }
108 
109 const struct got_error *
110 open_commit(struct got_commit_object **commit, struct got_pack *pack,
111     struct got_packidx *packidx, int obj_idx, struct got_object_id *id,
112     struct got_object_cache *objcache)
113 {
114 	const struct got_error *err = NULL;
115 	struct got_object *obj = NULL;
116 	uint8_t *buf = NULL;
117 	size_t len;
118 
119 	*commit = NULL;
120 
121 	obj = got_object_cache_get(objcache, id);
122 	if (obj) {
123 		obj->refcnt++;
124 	} else {
125 		err = open_object(&obj, pack, packidx, obj_idx, id,
126 		    objcache);
127 		if (err)
128 			return err;
129 	}
130 
131 	err = got_packfile_extract_object_to_mem(&buf, &len, obj, pack);
132 	if (err)
133 		goto done;
134 
135 	obj->size = len;
136 
137 	err = got_object_parse_commit(commit, buf, len);
138 done:
139 	got_object_close(obj);
140 	free(buf);
141 	return err;
142 }
143 
144 static const struct got_error *
145 commit_request(struct imsg *imsg, struct imsgbuf *ibuf, struct got_pack *pack,
146     struct got_packidx *packidx, struct got_object_cache *objcache)
147 {
148 	const struct got_error *err = NULL;
149 	struct got_imsg_packed_object iobj;
150 	struct got_commit_object *commit = NULL;
151 	struct got_object_id id;
152 	size_t datalen;
153 
154 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
155 	if (datalen != sizeof(iobj))
156 		return got_error(GOT_ERR_PRIVSEP_LEN);
157 	memcpy(&iobj, imsg->data, sizeof(iobj));
158 	memcpy(id.sha1, iobj.id, SHA1_DIGEST_LENGTH);
159 
160 	err = open_commit(&commit, pack, packidx, iobj.idx, &id, objcache);
161 	if (err)
162 		goto done;
163 
164 	err = got_privsep_send_commit(ibuf, commit);
165 done:
166 	if (commit)
167 		got_object_commit_close(commit);
168 	if (err) {
169 		if (err->code == GOT_ERR_PRIVSEP_PIPE)
170 			err = NULL;
171 		else
172 			got_privsep_send_error(ibuf, err);
173 	}
174 
175 	return err;
176 }
177 
178 const struct got_error *
179 open_tree(uint8_t **buf, struct got_pathlist_head *entries, int *nentries,
180     struct got_pack *pack, struct got_packidx *packidx, int obj_idx,
181     struct got_object_id *id, struct got_object_cache *objcache)
182 {
183 	const struct got_error *err = NULL;
184 	struct got_object *obj = NULL;
185 	size_t len;
186 
187 	*buf = NULL;
188 	*nentries = 0;
189 
190 	obj = got_object_cache_get(objcache, id);
191 	if (obj) {
192 		obj->refcnt++;
193 	} else {
194 		err = open_object(&obj, pack, packidx, obj_idx, id,
195 		    objcache);
196 		if (err)
197 			return err;
198 	}
199 
200 	err = got_packfile_extract_object_to_mem(buf, &len, obj, pack);
201 	if (err)
202 		goto done;
203 
204 	obj->size = len;
205 
206 	err = got_object_parse_tree(entries, nentries, *buf, len);
207 done:
208 	got_object_close(obj);
209 	if (err) {
210 		free(*buf);
211 		*buf = NULL;
212 	}
213 	return err;
214 }
215 
216 static const struct got_error *
217 tree_request(struct imsg *imsg, struct imsgbuf *ibuf, struct got_pack *pack,
218     struct got_packidx *packidx, struct got_object_cache *objcache)
219 {
220 	const struct got_error *err = NULL;
221 	struct got_imsg_packed_object iobj;
222 	struct got_pathlist_head entries;
223 	int nentries = 0;
224 	uint8_t *buf = NULL;
225 	struct got_object_id id;
226 	size_t datalen;
227 
228 	TAILQ_INIT(&entries);
229 
230 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
231 	if (datalen != sizeof(iobj))
232 		return got_error(GOT_ERR_PRIVSEP_LEN);
233 	memcpy(&iobj, imsg->data, sizeof(iobj));
234 	memcpy(id.sha1, iobj.id, SHA1_DIGEST_LENGTH);
235 
236 	err = open_tree(&buf, &entries, &nentries, pack, packidx, iobj.idx,
237 	     &id, objcache);
238 	if (err)
239 		return err;
240 
241 	err = got_privsep_send_tree(ibuf, &entries, nentries);
242 	got_object_parsed_tree_entries_free(&entries);
243 	free(buf);
244 	if (err) {
245 		if (err->code == GOT_ERR_PRIVSEP_PIPE)
246 			err = NULL;
247 		else
248 			got_privsep_send_error(ibuf, err);
249 	}
250 
251 	return err;
252 }
253 
254 static const struct got_error *
255 receive_file(FILE **f, struct imsgbuf *ibuf, int imsg_code)
256 {
257 	const struct got_error *err;
258 	struct imsg imsg;
259 	size_t datalen;
260 
261 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
262 	if (err)
263 		return err;
264 
265 	if (imsg.hdr.type != imsg_code) {
266 		err = got_error(GOT_ERR_PRIVSEP_MSG);
267 		goto done;
268 	}
269 
270 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
271 	if (datalen != 0) {
272 		err = got_error(GOT_ERR_PRIVSEP_LEN);
273 		goto done;
274 	}
275 	if (imsg.fd == -1) {
276 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
277 		goto done;
278 	}
279 
280 	*f = fdopen(imsg.fd, "w+");
281 	if (*f == NULL) {
282 		err = got_error_from_errno("fdopen");
283 		close(imsg.fd);
284 		goto done;
285 	}
286 done:
287 	imsg_free(&imsg);
288 	return err;
289 }
290 
291 static const struct got_error *
292 blob_request(struct imsg *imsg, struct imsgbuf *ibuf, struct got_pack *pack,
293     struct got_packidx *packidx, struct got_object_cache *objcache)
294 {
295 	const struct got_error *err = NULL;
296 	struct got_imsg_packed_object iobj;
297 	struct got_object *obj = NULL;
298 	FILE *outfile = NULL, *basefile = NULL, *accumfile = NULL;
299 	struct got_object_id id;
300 	size_t datalen;
301 	uint64_t blob_size;
302 	uint8_t *buf = NULL;
303 
304 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
305 	if (datalen != sizeof(iobj))
306 		return got_error(GOT_ERR_PRIVSEP_LEN);
307 	memcpy(&iobj, imsg->data, sizeof(iobj));
308 	memcpy(id.sha1, iobj.id, SHA1_DIGEST_LENGTH);
309 
310 	obj = got_object_cache_get(objcache, &id);
311 	if (obj) {
312 		obj->refcnt++;
313 	} else {
314 		err = open_object(&obj, pack, packidx, iobj.idx, &id,
315 		    objcache);
316 		if (err)
317 			return err;
318 	}
319 
320 	err = receive_file(&outfile, ibuf, GOT_IMSG_BLOB_OUTFD);
321 	if (err)
322 		goto done;
323 	err = receive_file(&basefile, ibuf, GOT_IMSG_TMPFD);
324 	if (err)
325 		goto done;
326 	err = receive_file(&accumfile, ibuf, GOT_IMSG_TMPFD);
327 	if (err)
328 		goto done;
329 
330 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
331 		err = got_pack_get_max_delta_object_size(&blob_size, obj, pack);
332 		if (err)
333 			goto done;
334 	} else
335 		blob_size = obj->size;
336 
337 	if (blob_size <= GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
338 		err = got_packfile_extract_object_to_mem(&buf, &obj->size,
339 		    obj, pack);
340 	else
341 		err = got_packfile_extract_object(pack, obj, outfile, basefile,
342 		    accumfile);
343 	if (err)
344 		goto done;
345 
346 	err = got_privsep_send_blob(ibuf, obj->size, obj->hdrlen, buf);
347 done:
348 	free(buf);
349 	if (outfile && fclose(outfile) != 0 && err == NULL)
350 		err = got_error_from_errno("fclose");
351 	if (basefile && fclose(basefile) != 0 && err == NULL)
352 		err = got_error_from_errno("fclose");
353 	if (accumfile && fclose(accumfile) != 0 && err == NULL)
354 		err = got_error_from_errno("fclose");
355 	got_object_close(obj);
356 	if (err && err->code != GOT_ERR_PRIVSEP_PIPE)
357 		got_privsep_send_error(ibuf, err);
358 
359 	return err;
360 }
361 
362 static const struct got_error *
363 tag_request(struct imsg *imsg, struct imsgbuf *ibuf, struct got_pack *pack,
364     struct got_packidx *packidx, struct got_object_cache *objcache)
365 {
366 	const struct got_error *err = NULL;
367 	struct got_imsg_packed_object iobj;
368 	struct got_object *obj = NULL;
369 	struct got_tag_object *tag = NULL;
370 	uint8_t *buf = NULL;
371 	size_t len;
372 	struct got_object_id id;
373 	size_t datalen;
374 
375 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
376 	if (datalen != sizeof(iobj))
377 		return got_error(GOT_ERR_PRIVSEP_LEN);
378 	memcpy(&iobj, imsg->data, sizeof(iobj));
379 	memcpy(id.sha1, iobj.id, SHA1_DIGEST_LENGTH);
380 
381 	obj = got_object_cache_get(objcache, &id);
382 	if (obj) {
383 		obj->refcnt++;
384 	} else {
385 		err = open_object(&obj, pack, packidx, iobj.idx, &id,
386 		    objcache);
387 		if (err)
388 			return err;
389 	}
390 
391 	err = got_packfile_extract_object_to_mem(&buf, &len, obj, pack);
392 	if (err)
393 		goto done;
394 
395 	obj->size = len;
396 	err = got_object_parse_tag(&tag, buf, len);
397 	if (err)
398 		goto done;
399 
400 	err = got_privsep_send_tag(ibuf, tag);
401 done:
402 	free(buf);
403 	got_object_close(obj);
404 	if (tag)
405 		got_object_tag_close(tag);
406 	if (err) {
407 		if (err->code == GOT_ERR_PRIVSEP_PIPE)
408 			err = NULL;
409 		else
410 			got_privsep_send_error(ibuf, err);
411 	}
412 
413 	return err;
414 }
415 
416 static struct got_parsed_tree_entry *
417 find_entry_by_name(struct got_pathlist_head *entries, int nentries,
418     const char *name, size_t len)
419 {
420 	struct got_pathlist_entry *pe;
421 
422 	/* Note that tree entries are sorted in strncmp() order. */
423 	TAILQ_FOREACH(pe, entries, entry) {
424 		int cmp = strncmp(pe->path, name, len);
425 		if (cmp < 0)
426 			continue;
427 		if (cmp > 0)
428 			break;
429 		if (pe->path[len] == '\0')
430 			return (struct got_parsed_tree_entry *)pe->data;
431 	}
432 	return NULL;
433 }
434 
435 const struct got_error *
436 tree_path_changed(int *changed, uint8_t **buf1, uint8_t **buf2,
437     struct got_pathlist_head *entries1, int *nentries1,
438     struct got_pathlist_head *entries2, int *nentries2,
439     const char *path, struct got_pack *pack, struct got_packidx *packidx,
440     struct imsgbuf *ibuf, struct got_object_cache *objcache)
441 {
442 	const struct got_error *err = NULL;
443 	struct got_parsed_tree_entry *pte1 = NULL, *pte2 = NULL;
444 	const char *seg, *s;
445 	size_t seglen;
446 
447 	*changed = 0;
448 
449 	/* We not do support comparing the root path. */
450 	if (got_path_is_root_dir(path))
451 		return got_error_path(path, GOT_ERR_BAD_PATH);
452 
453 	s = path;
454 	while (*s == '/')
455 		s++;
456 	seg = s;
457 	seglen = 0;
458 	while (*s) {
459 		if (*s != '/') {
460 			s++;
461 			seglen++;
462 			if (*s)
463 				continue;
464 		}
465 
466 		pte1 = find_entry_by_name(entries1, *nentries1, seg, seglen);
467 		if (pte1 == NULL) {
468 			err = got_error(GOT_ERR_NO_OBJ);
469 			break;
470 		}
471 
472 		pte2 = find_entry_by_name(entries2, *nentries2, seg, seglen);
473 		if (pte2 == NULL) {
474 			*changed = 1;
475 			break;
476 		}
477 
478 		if (pte1->mode != pte2->mode) {
479 			*changed = 1;
480 			break;
481 		}
482 
483 		if (memcmp(pte1->id, pte2->id, SHA1_DIGEST_LENGTH) == 0) {
484 			*changed = 0;
485 			break;
486 		}
487 
488 		if (*s == '\0') { /* final path element */
489 			*changed = 1;
490 			break;
491 		}
492 
493 		seg = s + 1;
494 		s++;
495 		seglen = 0;
496 		if (*s) {
497 			struct got_object_id id1, id2;
498 			int idx;
499 
500 			idx = got_packidx_get_object_idx_sha1(packidx,
501 			    pte1->id);
502 			if (idx == -1) {
503 				err = got_error(GOT_ERR_NO_OBJ);
504 				break;
505 			}
506 			memcpy(id1.sha1, pte1->id, SHA1_DIGEST_LENGTH);
507 			got_object_parsed_tree_entries_free(entries1);
508 			*nentries1 = 0;
509 			free(*buf1);
510 			*buf1 = NULL;
511 			err = open_tree(buf1, entries1, nentries1, pack,
512 			    packidx, idx, &id1, objcache);
513 			pte1 = NULL;
514 			if (err)
515 				break;
516 
517 			idx = got_packidx_get_object_idx_sha1(packidx,
518 			    pte2->id);
519 			if (idx == -1) {
520 				err = got_error(GOT_ERR_NO_OBJ);
521 				break;
522 			}
523 			memcpy(id2.sha1, pte2->id, SHA1_DIGEST_LENGTH);
524 			got_object_parsed_tree_entries_free(entries2);
525 			*nentries2 = 0;
526 			free(*buf2);
527 			*buf2 = NULL;
528 			err = open_tree(buf2, entries2, nentries2, pack,
529 			    packidx, idx, &id2, objcache);
530 			pte2 = NULL;
531 			if (err)
532 				break;
533 		}
534 	}
535 
536 	return err;
537 }
538 
539 static const struct got_error *
540 commit_traversal_request(struct imsg *imsg, struct imsgbuf *ibuf,
541     struct got_pack *pack, struct got_packidx *packidx,
542     struct got_object_cache *objcache)
543 {
544 	const struct got_error *err = NULL;
545 	struct got_imsg_packed_object iobj;
546 	struct got_object_qid *pid;
547 	struct got_commit_object *commit = NULL, *pcommit = NULL;
548 	struct got_pathlist_head entries, pentries;
549 	int nentries = 0, pnentries = 0;
550 	struct got_object_id id;
551 	size_t datalen, path_len;
552 	char *path = NULL;
553 	const int min_alloc = 64;
554 	int changed = 0, ncommits = 0, nallocated = 0;
555 	struct got_object_id *commit_ids = NULL;
556 
557 	TAILQ_INIT(&entries);
558 	TAILQ_INIT(&pentries);
559 
560 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
561 	if (datalen < sizeof(iobj))
562 		return got_error(GOT_ERR_PRIVSEP_LEN);
563 	memcpy(&iobj, imsg->data, sizeof(iobj));
564 	memcpy(id.sha1, iobj.id, SHA1_DIGEST_LENGTH);
565 
566 	path_len = datalen - sizeof(iobj) - 1;
567 	if (path_len < 0)
568 		return got_error(GOT_ERR_PRIVSEP_LEN);
569 	if (path_len > 0) {
570 		path = imsg->data + sizeof(iobj);
571 		if (path[path_len] != '\0')
572 			return got_error(GOT_ERR_PRIVSEP_LEN);
573 	}
574 
575 	nallocated = min_alloc;
576 	commit_ids = reallocarray(NULL, nallocated, sizeof(*commit_ids));
577 	if (commit_ids == NULL)
578 		return got_error_from_errno("reallocarray");
579 
580 	do {
581 		const size_t max_datalen = MAX_IMSGSIZE - IMSG_HEADER_SIZE;
582 		int idx;
583 
584 		if (sigint_received) {
585 			err = got_error(GOT_ERR_CANCELLED);
586 			goto done;
587 		}
588 
589 		if (commit == NULL) {
590 			idx = got_packidx_get_object_idx(packidx, &id);
591 			if (idx == -1)
592 				break;
593 			err = open_commit(&commit, pack, packidx,
594 			    idx, &id, objcache);
595 			if (err) {
596 				if (err->code != GOT_ERR_NO_OBJ)
597 					goto done;
598 				err = NULL;
599 				break;
600 			}
601 		}
602 
603 		if (sizeof(struct got_imsg_traversed_commits) +
604 		    ncommits * SHA1_DIGEST_LENGTH >= max_datalen) {
605 			err = got_privsep_send_traversed_commits(commit_ids,
606 			    ncommits, ibuf);
607 			if (err)
608 				goto done;
609 			ncommits = 0;
610 		}
611 		ncommits++;
612 		if (ncommits > nallocated) {
613 			struct got_object_id *new;
614 			nallocated += min_alloc;
615 			new = reallocarray(commit_ids, nallocated,
616 			    sizeof(*commit_ids));
617 			if (new == NULL) {
618 				err = got_error_from_errno("reallocarray");
619 				goto done;
620 			}
621 			commit_ids = new;
622 		}
623 		memcpy(commit_ids[ncommits - 1].sha1, id.sha1,
624 		    SHA1_DIGEST_LENGTH);
625 
626 		pid = SIMPLEQ_FIRST(&commit->parent_ids);
627 		if (pid == NULL)
628 			break;
629 
630 		idx = got_packidx_get_object_idx(packidx, pid->id);
631 		if (idx == -1)
632 			break;
633 
634 		err = open_commit(&pcommit, pack, packidx, idx, pid->id,
635 		    objcache);
636 		if (err) {
637 			if (err->code != GOT_ERR_NO_OBJ)
638 				goto done;
639 			err = NULL;
640 			break;
641 		}
642 
643 		if (path[0] == '/' && path[1] == '\0') {
644 			if (got_object_id_cmp(pcommit->tree_id,
645 			    commit->tree_id) != 0) {
646 				changed = 1;
647 				break;
648 			}
649 		} else {
650 			int pidx;
651 			uint8_t *buf = NULL, *pbuf = NULL;
652 
653 			idx = got_packidx_get_object_idx(packidx,
654 			    commit->tree_id);
655 			if (idx == -1)
656 				break;
657 			pidx = got_packidx_get_object_idx(packidx,
658 			    pcommit->tree_id);
659 			if (pidx == -1)
660 				break;
661 
662 			err = open_tree(&buf, &entries, &nentries, pack,
663 			    packidx, idx, commit->tree_id, objcache);
664 			if (err)
665 				goto done;
666 			err = open_tree(&pbuf, &pentries, &pnentries, pack,
667 			    packidx, pidx, pcommit->tree_id, objcache);
668 			if (err) {
669 				free(buf);
670 				goto done;
671 			}
672 
673 			err = tree_path_changed(&changed, &buf, &pbuf,
674 			    &entries, &nentries, &pentries, &pnentries, path,
675 			    pack, packidx, ibuf, objcache);
676 
677 			got_object_parsed_tree_entries_free(&entries);
678 			nentries = 0;
679 			free(buf);
680 			got_object_parsed_tree_entries_free(&pentries);
681 			pnentries = 0;
682 			free(pbuf);
683 			if (err) {
684 				if (err->code != GOT_ERR_NO_OBJ)
685 					goto done;
686 				err = NULL;
687 				break;
688 			}
689 		}
690 
691 		if (!changed) {
692 			memcpy(id.sha1, pid->id->sha1, SHA1_DIGEST_LENGTH);
693 			got_object_commit_close(commit);
694 			commit = pcommit;
695 			pcommit = NULL;
696 		}
697 	} while (!changed);
698 
699 	if (ncommits > 0) {
700 		err = got_privsep_send_traversed_commits(commit_ids,
701 		    ncommits, ibuf);
702 		if (err)
703 			goto done;
704 
705 		if (changed) {
706 			err = got_privsep_send_commit(ibuf, commit);
707 			if (err)
708 				goto done;
709 		}
710 	}
711 	err = got_privsep_send_commit_traversal_done(ibuf);
712 done:
713 	free(commit_ids);
714 	if (commit)
715 		got_object_commit_close(commit);
716 	if (pcommit)
717 		got_object_commit_close(pcommit);
718 	if (nentries != 0)
719 		got_object_parsed_tree_entries_free(&entries);
720 	if (pnentries != 0)
721 		got_object_parsed_tree_entries_free(&pentries);
722 	if (err) {
723 		if (err->code == GOT_ERR_PRIVSEP_PIPE)
724 			err = NULL;
725 		else
726 			got_privsep_send_error(ibuf, err);
727 	}
728 
729 	return err;
730 }
731 
732 static const struct got_error *
733 receive_packidx(struct got_packidx **packidx, struct imsgbuf *ibuf)
734 {
735 	const struct got_error *err = NULL;
736 	struct imsg imsg;
737 	struct got_imsg_packidx ipackidx;
738 	size_t datalen;
739 	struct got_packidx *p;
740 
741 	*packidx = NULL;
742 
743 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
744 	if (err)
745 		return err;
746 
747 	p = calloc(1, sizeof(*p));
748 	if (p == NULL) {
749 		err = got_error_from_errno("calloc");
750 		goto done;
751 	}
752 
753 	if (imsg.hdr.type != GOT_IMSG_PACKIDX) {
754 		err = got_error(GOT_ERR_PRIVSEP_MSG);
755 		goto done;
756 	}
757 
758 	if (imsg.fd == -1) {
759 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
760 		goto done;
761 	}
762 
763 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
764 	if (datalen != sizeof(ipackidx)) {
765 		err = got_error(GOT_ERR_PRIVSEP_LEN);
766 		goto done;
767 	}
768 	memcpy(&ipackidx, imsg.data, sizeof(ipackidx));
769 
770 	p->len = ipackidx.len;
771 	p->fd = dup(imsg.fd);
772 	if (p->fd == -1) {
773 		err = got_error_from_errno("dup");
774 		goto done;
775 	}
776 	if (lseek(p->fd, 0, SEEK_SET) == -1) {
777 		err = got_error_from_errno("lseek");
778 		goto done;
779 	}
780 
781 #ifndef GOT_PACK_NO_MMAP
782 	p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
783 	if (p->map == MAP_FAILED)
784 		p->map = NULL; /* fall back to read(2) */
785 #endif
786 	err = got_packidx_init_hdr(p, 1);
787 done:
788 	if (err) {
789 		if (imsg.fd != -1)
790 			close(imsg.fd);
791 		got_packidx_close(p);
792 	} else
793 		*packidx = p;
794 	imsg_free(&imsg);
795 	return err;
796 }
797 
798 static const struct got_error *
799 receive_pack(struct got_pack **packp, struct imsgbuf *ibuf)
800 {
801 	const struct got_error *err = NULL;
802 	struct imsg imsg;
803 	struct got_imsg_pack ipack;
804 	size_t datalen;
805 	struct got_pack *pack;
806 
807 	*packp = NULL;
808 
809 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
810 	if (err)
811 		return err;
812 
813 	pack = calloc(1, sizeof(*pack));
814 	if (pack == NULL) {
815 		err = got_error_from_errno("calloc");
816 		goto done;
817 	}
818 
819 	if (imsg.hdr.type != GOT_IMSG_PACK) {
820 		err = got_error(GOT_ERR_PRIVSEP_MSG);
821 		goto done;
822 	}
823 
824 	if (imsg.fd == -1) {
825 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
826 		goto done;
827 	}
828 
829 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
830 	if (datalen != sizeof(ipack)) {
831 		err = got_error(GOT_ERR_PRIVSEP_LEN);
832 		goto done;
833 	}
834 	memcpy(&ipack, imsg.data, sizeof(ipack));
835 
836 	pack->filesize = ipack.filesize;
837 	pack->fd = dup(imsg.fd);
838 	if (pack->fd == -1) {
839 		err = got_error_from_errno("dup");
840 		goto done;
841 	}
842 	if (lseek(pack->fd, 0, SEEK_SET) == -1) {
843 		err = got_error_from_errno("lseek");
844 		goto done;
845 	}
846 	pack->path_packfile = strdup(ipack.path_packfile);
847 	if (pack->path_packfile == NULL) {
848 		err = got_error_from_errno("strdup");
849 		goto done;
850 	}
851 
852 	pack->delta_cache = got_delta_cache_alloc(100,
853 	    GOT_DELTA_RESULT_SIZE_CACHED_MAX);
854 	if (pack->delta_cache == NULL) {
855 		err = got_error_from_errno("got_delta_cache_alloc");
856 		goto done;
857 	}
858 
859 #ifndef GOT_PACK_NO_MMAP
860 	pack->map = mmap(NULL, pack->filesize, PROT_READ, MAP_PRIVATE,
861 	    pack->fd, 0);
862 	if (pack->map == MAP_FAILED)
863 		pack->map = NULL; /* fall back to read(2) */
864 #endif
865 done:
866 	if (err) {
867 		if (imsg.fd != -1)
868 			close(imsg.fd);
869 		free(pack);
870 	} else
871 		*packp = pack;
872 	imsg_free(&imsg);
873 	return err;
874 }
875 
876 int
877 main(int argc, char *argv[])
878 {
879 	const struct got_error *err = NULL;
880 	struct imsgbuf ibuf;
881 	struct imsg imsg;
882 	struct got_packidx *packidx = NULL;
883 	struct got_pack *pack = NULL;
884 	struct got_object_cache objcache;
885 
886 	//static int attached;
887 	//while (!attached) sleep(1);
888 
889 	signal(SIGINT, catch_sigint);
890 
891 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
892 
893 	err = got_object_cache_init(&objcache, GOT_OBJECT_CACHE_TYPE_OBJ);
894 	if (err) {
895 		err = got_error_from_errno("got_object_cache_init");
896 		got_privsep_send_error(&ibuf, err);
897 		return 1;
898 	}
899 
900 #ifndef PROFILE
901 	/* revoke access to most system calls */
902 	if (pledge("stdio recvfd", NULL) == -1) {
903 		err = got_error_from_errno("pledge");
904 		got_privsep_send_error(&ibuf, err);
905 		return 1;
906 	}
907 #endif
908 
909 	err = receive_packidx(&packidx, &ibuf);
910 	if (err) {
911 		got_privsep_send_error(&ibuf, err);
912 		return 1;
913 	}
914 
915 	err = receive_pack(&pack, &ibuf);
916 	if (err) {
917 		got_privsep_send_error(&ibuf, err);
918 		return 1;
919 	}
920 
921 	for (;;) {
922 		imsg.fd = -1;
923 
924 		if (sigint_received) {
925 			err = got_error(GOT_ERR_CANCELLED);
926 			break;
927 		}
928 
929 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
930 		if (err) {
931 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
932 				err = NULL;
933 			break;
934 		}
935 
936 		if (imsg.hdr.type == GOT_IMSG_STOP)
937 			break;
938 
939 		switch (imsg.hdr.type) {
940 		case GOT_IMSG_PACKED_OBJECT_REQUEST:
941 			err = object_request(&imsg, &ibuf, pack, packidx,
942 			    &objcache);
943 			break;
944 		case GOT_IMSG_COMMIT_REQUEST:
945 			err = commit_request(&imsg, &ibuf, pack, packidx,
946 			    &objcache);
947 			break;
948 		case GOT_IMSG_TREE_REQUEST:
949 			err = tree_request(&imsg, &ibuf, pack, packidx,
950 			   &objcache);
951 			break;
952 		case GOT_IMSG_BLOB_REQUEST:
953 			err = blob_request(&imsg, &ibuf, pack, packidx,
954 			   &objcache);
955 			break;
956 		case GOT_IMSG_TAG_REQUEST:
957 			err = tag_request(&imsg, &ibuf, pack, packidx,
958 			   &objcache);
959 			break;
960 		case GOT_IMSG_COMMIT_TRAVERSAL_REQUEST:
961 			err = commit_traversal_request(&imsg, &ibuf, pack,
962 			    packidx, &objcache);
963 			break;
964 		default:
965 			err = got_error(GOT_ERR_PRIVSEP_MSG);
966 			break;
967 		}
968 
969 		if (imsg.fd != -1 && close(imsg.fd) != 0 && err == NULL)
970 			err = got_error_from_errno("close");
971 		imsg_free(&imsg);
972 		if (err)
973 			break;
974 	}
975 
976 	if (packidx)
977 		got_packidx_close(packidx);
978 	if (pack)
979 		got_pack_close(pack);
980 	got_object_cache_close(&objcache);
981 	imsg_clear(&ibuf);
982 	if (err) {
983 		if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
984 			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
985 			got_privsep_send_error(&ibuf, err);
986 		}
987 	}
988 	if (close(GOT_IMSG_FD_CHILD) != 0 && err == NULL)
989 		err = got_error_from_errno("close");
990 	return err ? 1 : 0;
991 }