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Date:: Thu Apr 20 20:07:14 2023 UTC
Message:: fix typo in gotd debug messages: receving -> receiving
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1 /*
2  * Copyright (c) 2022 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/queue.h>
18 #include <sys/types.h>
19 
20 #include <event.h>
21 #include <errno.h>
22 #include <imsg.h>
23 #include <signal.h>
24 #include <stdlib.h>
25 #include <limits.h>
26 #include <poll.h>
27 #include <sha1.h>
28 #include <sha2.h>
29 #include <siphash.h>
30 #include <stdio.h>
31 #include <string.h>
32 #include <unistd.h>
33 
34 #include "got_error.h"
35 #include "got_cancel.h"
36 #include "got_object.h"
37 #include "got_repository.h"
38 #include "got_reference.h"
39 #include "got_repository_admin.h"
40 #include "got_path.h"
41 
42 #include "got_lib_delta.h"
43 #include "got_lib_object.h"
44 #include "got_lib_object_idset.h"
45 #include "got_lib_hash.h"
46 #include "got_lib_pack.h"
47 #include "got_lib_ratelimit.h"
48 #include "got_lib_pack_create.h"
49 #include "got_lib_poll.h"
50 
51 #include "log.h"
52 #include "gotd.h"
53 #include "repo_read.h"
54 
55 #ifndef nitems
56 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
57 #endif
58 
59 static struct repo_read {
60 	pid_t pid;
61 	const char *title;
62 	struct got_repository *repo;
63 	int *pack_fds;
64 	int *temp_fds;
65 	int session_fd;
66 	struct gotd_imsgev session_iev;
67 } repo_read;
68 
69 static struct repo_read_client {
70 	uint32_t			 id;
71 	int				 fd;
72 	int				 delta_cache_fd;
73 	int				 report_progress;
74 	int				 pack_pipe;
75 	struct got_object_idset		*want_ids;
76 	struct got_object_idset		*have_ids;
77 } repo_read_client;
78 
79 static volatile sig_atomic_t sigint_received;
80 static volatile sig_atomic_t sigterm_received;
81 
82 static void
83 catch_sigint(int signo)
84 {
85 	sigint_received = 1;
86 }
87 
88 static void
89 catch_sigterm(int signo)
90 {
91 	sigterm_received = 1;
92 }
93 
94 static const struct got_error *
95 check_cancelled(void *arg)
96 {
97 	if (sigint_received || sigterm_received)
98 		return got_error(GOT_ERR_CANCELLED);
99 
100 	return NULL;
101 }
102 
103 static const struct got_error *
104 send_symref(struct got_reference *symref, struct got_object_id *target_id,
105     struct imsgbuf *ibuf)
106 {
107 	const struct got_error *err = NULL;
108 	struct gotd_imsg_symref isymref;
109 	const char *refname = got_ref_get_name(symref);
110 	const char *target = got_ref_get_symref_target(symref);
111 	size_t len;
112 	struct ibuf *wbuf;
113 
114 	memset(&isymref, 0, sizeof(isymref));
115 	isymref.name_len = strlen(refname);
116 	isymref.target_len = strlen(target);
117 	memcpy(isymref.target_id, target_id->sha1, sizeof(isymref.target_id));
118 
119 	len = sizeof(isymref) + isymref.name_len + isymref.target_len;
120 	if (len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
121 		err = got_error(GOT_ERR_NO_SPACE);
122 		goto done;
123 	}
124 
125 	wbuf = imsg_create(ibuf, GOTD_IMSG_SYMREF, 0, 0, len);
126 	if (wbuf == NULL) {
127 		err = got_error_from_errno("imsg_create SYMREF");
128 		goto done;
129 	}
130 
131 	if (imsg_add(wbuf, &isymref, sizeof(isymref)) == -1) {
132 		err = got_error_from_errno("imsg_add SYMREF");
133 		goto done;
134 	}
135 	if (imsg_add(wbuf, refname, isymref.name_len) == -1) {
136 		err = got_error_from_errno("imsg_add SYMREF");
137 		goto done;
138 	}
139 	if (imsg_add(wbuf, target, isymref.target_len) == -1) {
140 		err = got_error_from_errno("imsg_add SYMREF");
141 		goto done;
142 	}
143 
144 	wbuf->fd = -1;
145 	imsg_close(ibuf, wbuf);
146 done:
147 	free(target_id);
148 	return err;
149 }
150 
151 static const struct got_error *
152 send_peeled_tag_ref(struct got_reference *ref, struct got_object *obj,
153     struct imsgbuf *ibuf)
154 {
155 	const struct got_error *err = NULL;
156 	struct got_tag_object *tag;
157 	size_t namelen, len;
158 	char *peeled_refname = NULL;
159 	struct got_object_id *id;
160 	struct ibuf *wbuf;
161 
162 	err = got_object_tag_open(&tag, repo_read.repo, obj);
163 	if (err)
164 		return err;
165 
166 	if (asprintf(&peeled_refname, "%s^{}", got_ref_get_name(ref)) == -1) {
167 		err = got_error_from_errno("asprintf");
168 		goto done;
169 	}
170 
171 	id = got_object_tag_get_object_id(tag);
172 	namelen = strlen(peeled_refname);
173 
174 	len = sizeof(struct gotd_imsg_ref) + namelen;
175 	if (len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
176 		err = got_error(GOT_ERR_NO_SPACE);
177 		goto done;
178 	}
179 
180 	wbuf = imsg_create(ibuf, GOTD_IMSG_REF, PROC_REPO_READ,
181 	    repo_read.pid, len);
182 	if (wbuf == NULL) {
183 		err = got_error_from_errno("imsg_create MREF");
184 		goto done;
185 	}
186 
187 	/* Keep in sync with struct gotd_imsg_ref definition. */
188 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
189 		err = got_error_from_errno("imsg_add REF");
190 		goto done;
191 	}
192 	if (imsg_add(wbuf, &namelen, sizeof(namelen)) == -1) {
193 		err = got_error_from_errno("imsg_add REF");
194 		goto done;
195 	}
196 	if (imsg_add(wbuf, peeled_refname, namelen) == -1) {
197 		err = got_error_from_errno("imsg_add REF");
198 		goto done;
199 	}
200 
201 	wbuf->fd = -1;
202 	imsg_close(ibuf, wbuf);
203 done:
204 	got_object_tag_close(tag);
205 	return err;
206 }
207 
208 static const struct got_error *
209 send_ref(struct got_reference *ref, struct imsgbuf *ibuf)
210 {
211 	const struct got_error *err;
212 	const char *refname = got_ref_get_name(ref);
213 	size_t namelen;
214 	struct got_object_id *id = NULL;
215 	struct got_object *obj = NULL;
216 	size_t len;
217 	struct ibuf *wbuf;
218 
219 	namelen = strlen(refname);
220 
221 	len = sizeof(struct gotd_imsg_ref) + namelen;
222 	if (len > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
223 		return got_error(GOT_ERR_NO_SPACE);
224 
225 	err = got_ref_resolve(&id, repo_read.repo, ref);
226 	if (err)
227 		return err;
228 
229 	wbuf = imsg_create(ibuf, GOTD_IMSG_REF, PROC_REPO_READ,
230 	    repo_read.pid, len);
231 	if (wbuf == NULL) {
232 		err = got_error_from_errno("imsg_create REF");
233 		goto done;
234 	}
235 
236 	/* Keep in sync with struct gotd_imsg_ref definition. */
237 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
238 		return got_error_from_errno("imsg_add REF");
239 	if (imsg_add(wbuf, &namelen, sizeof(namelen)) == -1)
240 		return got_error_from_errno("imsg_add REF");
241 	if (imsg_add(wbuf, refname, namelen) == -1)
242 		return got_error_from_errno("imsg_add REF");
243 
244 	wbuf->fd = -1;
245 	imsg_close(ibuf, wbuf);
246 
247 	err = got_object_open(&obj, repo_read.repo, id);
248 	if (err)
249 		goto done;
250 	if (obj->type == GOT_OBJ_TYPE_TAG)
251 		err = send_peeled_tag_ref(ref, obj, ibuf);
252 done:
253 	if (obj)
254 		got_object_close(obj);
255 	free(id);
256 	return err;
257 }
258 
259 static const struct got_error *
260 list_refs(struct imsg *imsg)
261 {
262 	const struct got_error *err;
263 	struct repo_read_client *client = &repo_read_client;
264 	struct got_reflist_head refs;
265 	struct got_reflist_entry *re;
266 	struct gotd_imsg_list_refs_internal ireq;
267 	size_t datalen;
268 	struct gotd_imsg_reflist irefs;
269 	struct imsgbuf ibuf;
270 	int client_fd = imsg->fd;
271 	struct got_object_id *head_target_id = NULL;
272 
273 	TAILQ_INIT(&refs);
274 
275 	if (client_fd == -1)
276 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
277 
278 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
279 	if (datalen != sizeof(ireq))
280 		return got_error(GOT_ERR_PRIVSEP_LEN);
281 	memcpy(&ireq, imsg->data, sizeof(ireq));
282 
283 	if (ireq.client_id == 0)
284 		return got_error(GOT_ERR_CLIENT_ID);
285 	if (client->id != 0) {
286 		return got_error_msg(GOT_ERR_CLIENT_ID,
287 		    "duplicate list-refs request");
288 	}
289 	client->id = ireq.client_id;
290 	client->fd = client_fd;
291 
292 	imsg_init(&ibuf, client_fd);
293 
294 	err = got_ref_list(&refs, repo_read.repo, "",
295 	    got_ref_cmp_by_name, NULL);
296 	if (err)
297 		return err;
298 
299 	memset(&irefs, 0, sizeof(irefs));
300 	TAILQ_FOREACH(re, &refs, entry) {
301 		struct got_object_id *id;
302 		int obj_type;
303 
304 		if (got_ref_is_symbolic(re->ref)) {
305 			const char *refname = got_ref_get_name(re->ref);
306 			if (strcmp(refname, GOT_REF_HEAD) != 0)
307 				continue;
308 			err = got_ref_resolve(&head_target_id, repo_read.repo,
309 			    re->ref);
310 			if (err) {
311 				if (err->code != GOT_ERR_NOT_REF)
312 					return err;
313 				/*
314 				 * HEAD points to a non-existent branch.
315 				 * Do not advertise it.
316 				 * Matches git-daemon's behaviour.
317 				 */
318 				head_target_id = NULL;
319 				err = NULL;
320 			} else
321 				irefs.nrefs++;
322 			continue;
323 		}
324 
325 		irefs.nrefs++;
326 
327 		/* Account for a peeled tag refs. */
328 		err = got_ref_resolve(&id, repo_read.repo, re->ref);
329 		if (err)
330 			goto done;
331 		err = got_object_get_type(&obj_type, repo_read.repo, id);
332 		free(id);
333 		if (err)
334 			goto done;
335 		if (obj_type == GOT_OBJ_TYPE_TAG)
336 			irefs.nrefs++;
337 	}
338 
339 	if (imsg_compose(&ibuf, GOTD_IMSG_REFLIST, PROC_REPO_READ,
340 	    repo_read.pid, -1, &irefs, sizeof(irefs)) == -1) {
341 		err = got_error_from_errno("imsg_compose REFLIST");
342 		goto done;
343 	}
344 
345 	/*
346 	 * Send the HEAD symref first. In Git-protocol versions < 2
347 	 * the HEAD symref must be announced on the initial line of
348 	 * the server's ref advertisement.
349 	 * For now, we do not advertise symrefs other than HEAD.
350 	 */
351 	TAILQ_FOREACH(re, &refs, entry) {
352 		if (!got_ref_is_symbolic(re->ref) ||
353 		    strcmp(got_ref_get_name(re->ref), GOT_REF_HEAD) != 0 ||
354 		    head_target_id == NULL)
355 			continue;
356 		err = send_symref(re->ref, head_target_id, &ibuf);
357 		if (err)
358 			goto done;
359 		break;
360 	}
361 	TAILQ_FOREACH(re, &refs, entry) {
362 		if (got_ref_is_symbolic(re->ref))
363 			continue;
364 		err = send_ref(re->ref, &ibuf);
365 		if (err)
366 			goto done;
367 	}
368 
369 	err = gotd_imsg_flush(&ibuf);
370 done:
371 	got_ref_list_free(&refs);
372 	imsg_clear(&ibuf);
373 	return err;
374 }
375 
376 static const struct got_error *
377 append_object_id(struct got_object_id *id, void *data, void *arg)
378 {
379 	struct gotd_object_id_array *array = arg;
380 	const size_t alloc_chunksz = 256;
381 
382 	if (array->ids == NULL) {
383 		array->ids = reallocarray(NULL, alloc_chunksz,
384 		    sizeof(*array->ids));
385 		if (array->ids == NULL)
386 			return got_error_from_errno("reallocarray");
387 		array->nalloc = alloc_chunksz;
388 		array->nids = 0;
389 	} else if (array->nalloc <= array->nids) {
390 		struct got_object_id **new;
391 		new = recallocarray(array->ids, array->nalloc,
392 		    array->nalloc + alloc_chunksz, sizeof(*new));
393 		if (new == NULL)
394 			return got_error_from_errno("recallocarray");
395 		array->ids = new;
396 		array->nalloc += alloc_chunksz;
397 	}
398 
399 	array->ids[array->nids] = id;
400 	array->nids++;
401 	return NULL;
402 }
403 
404 static const struct got_error *
405 recv_want(struct imsg *imsg)
406 {
407 	const struct got_error *err;
408 	struct repo_read_client *client = &repo_read_client;
409 	struct gotd_imsg_want iwant;
410 	size_t datalen;
411 	char hex[SHA1_DIGEST_STRING_LENGTH];
412 	struct got_object_id id;
413 	int obj_type;
414 	struct imsgbuf ibuf;
415 
416 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
417 	if (datalen != sizeof(iwant))
418 		return got_error(GOT_ERR_PRIVSEP_LEN);
419 	memcpy(&iwant, imsg->data, sizeof(iwant));
420 
421 	memset(&id, 0, sizeof(id));
422 	memcpy(id.sha1, iwant.object_id, SHA1_DIGEST_LENGTH);
423 
424 	if (log_getverbose() > 0 &&
425 	    got_sha1_digest_to_str(id.sha1, hex, sizeof(hex)))
426 		log_debug("client wants %s", hex);
427 
428 	imsg_init(&ibuf, client->fd);
429 
430 	err = got_object_get_type(&obj_type, repo_read.repo, &id);
431 	if (err)
432 		return err;
433 
434 	if (obj_type != GOT_OBJ_TYPE_COMMIT &&
435 	    obj_type != GOT_OBJ_TYPE_TAG)
436 		return got_error(GOT_ERR_OBJ_TYPE);
437 
438 	if (!got_object_idset_contains(client->want_ids, &id)) {
439 		err = got_object_idset_add(client->want_ids, &id, NULL);
440 		if (err)
441 			return err;
442 	}
443 
444 	gotd_imsg_send_ack(&id, &ibuf, PROC_REPO_READ, repo_read.pid);
445 	imsg_clear(&ibuf);
446 	return err;
447 }
448 
449 static const struct got_error *
450 recv_have(struct imsg *imsg)
451 {
452 	const struct got_error *err;
453 	struct repo_read_client *client = &repo_read_client;
454 	struct gotd_imsg_have ihave;
455 	size_t datalen;
456 	char hex[SHA1_DIGEST_STRING_LENGTH];
457 	struct got_object_id id;
458 	int obj_type;
459 	struct imsgbuf ibuf;
460 
461 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
462 	if (datalen != sizeof(ihave))
463 		return got_error(GOT_ERR_PRIVSEP_LEN);
464 	memcpy(&ihave, imsg->data, sizeof(ihave));
465 
466 	memset(&id, 0, sizeof(id));
467 	memcpy(id.sha1, ihave.object_id, SHA1_DIGEST_LENGTH);
468 
469 	if (log_getverbose() > 0 &&
470 	    got_sha1_digest_to_str(id.sha1, hex, sizeof(hex)))
471 		log_debug("client has %s", hex);
472 
473 	imsg_init(&ibuf, client->fd);
474 
475 	err = got_object_get_type(&obj_type, repo_read.repo, &id);
476 	if (err) {
477 		if (err->code == GOT_ERR_NO_OBJ) {
478 			gotd_imsg_send_nak(&id, &ibuf,
479 			    PROC_REPO_READ, repo_read.pid);
480 			err = NULL;
481 		}
482 		goto done;
483 	}
484 
485 	if (obj_type != GOT_OBJ_TYPE_COMMIT &&
486 	    obj_type != GOT_OBJ_TYPE_TAG) {
487 		gotd_imsg_send_nak(&id, &ibuf, PROC_REPO_READ, repo_read.pid);
488 		err = got_error(GOT_ERR_OBJ_TYPE);
489 		goto done;
490 	}
491 
492 	if (!got_object_idset_contains(client->have_ids, &id)) {
493 		err = got_object_idset_add(client->have_ids, &id, NULL);
494 		if (err)
495 			goto done;
496 	}
497 
498 	gotd_imsg_send_ack(&id, &ibuf, PROC_REPO_READ, repo_read.pid);
499 done:
500 	imsg_clear(&ibuf);
501 	return err;
502 }
503 
504 struct repo_read_pack_progress_arg {
505 	int report_progress;
506 	struct imsgbuf *ibuf;
507 	int sent_ready;
508 };
509 
510 static const struct got_error *
511 pack_progress(void *arg, int ncolored, int nfound, int ntrees,
512     off_t packfile_size, int ncommits, int nobj_total, int nobj_deltify,
513     int nobj_written)
514 {
515 	struct repo_read_pack_progress_arg *a = arg;
516 	struct gotd_imsg_packfile_progress iprog;
517 	int ret;
518 
519 	if (!a->report_progress)
520 		return NULL;
521 	if (packfile_size > 0 && a->sent_ready)
522 		return NULL;
523 
524 	memset(&iprog, 0, sizeof(iprog));
525 	iprog.ncolored = ncolored;
526 	iprog.nfound = nfound;
527 	iprog.ntrees = ntrees;
528 	iprog.packfile_size = packfile_size;
529 	iprog.ncommits = ncommits;
530 	iprog.nobj_total = nobj_total;
531 	iprog.nobj_deltify = nobj_deltify;
532 	iprog.nobj_written = nobj_written;
533 
534 	/* Using synchronous writes since we are blocking the event loop. */
535 	if (packfile_size == 0) {
536 		ret = imsg_compose(a->ibuf, GOTD_IMSG_PACKFILE_PROGRESS,
537 		    PROC_REPO_READ, repo_read.pid, -1, &iprog, sizeof(iprog));
538 		if (ret == -1) {
539 			return got_error_from_errno("imsg compose "
540 			    "PACKFILE_PROGRESS");
541 		}
542 	} else {
543 		a->sent_ready = 1;
544 		ret = imsg_compose(a->ibuf, GOTD_IMSG_PACKFILE_READY,
545 		    PROC_REPO_READ, repo_read.pid, -1, &iprog, sizeof(iprog));
546 		if (ret == -1) {
547 			return got_error_from_errno("imsg compose "
548 			    "PACKFILE_READY");
549 		}
550 	}
551 
552 	return gotd_imsg_flush(a->ibuf);
553 }
554 
555 static const struct got_error *
556 receive_delta_cache_fd(struct imsg *imsg,
557     struct gotd_imsgev *iev)
558 {
559 	struct repo_read_client *client = &repo_read_client;
560 	struct gotd_imsg_send_packfile ireq;
561 	size_t datalen;
562 
563 	log_debug("receiving delta cache file");
564 
565 	if (imsg->fd == -1)
566 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
567 
568 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
569 	if (datalen != sizeof(ireq))
570 		return got_error(GOT_ERR_PRIVSEP_LEN);
571 	memcpy(&ireq, imsg->data, sizeof(ireq));
572 
573 	if (client->delta_cache_fd != -1)
574 		return got_error(GOT_ERR_PRIVSEP_MSG);
575 
576 	client->delta_cache_fd = imsg->fd;
577 	client->report_progress = ireq.report_progress;
578 	return NULL;
579 }
580 
581 static const struct got_error *
582 receive_pack_pipe(struct imsg *imsg, struct gotd_imsgev *iev)
583 {
584 	struct repo_read_client *client = &repo_read_client;
585 	struct gotd_imsg_packfile_pipe ireq;
586 	size_t datalen;
587 
588 	log_debug("receiving pack pipe descriptor");
589 
590 	if (imsg->fd == -1)
591 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
592 
593 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
594 	if (datalen != sizeof(ireq))
595 		return got_error(GOT_ERR_PRIVSEP_LEN);
596 	memcpy(&ireq, imsg->data, sizeof(ireq));
597 
598 	if (client->pack_pipe != -1)
599 		return got_error(GOT_ERR_PRIVSEP_MSG);
600 
601 	client->pack_pipe = imsg->fd;
602 	return NULL;
603 }
604 
605 static const struct got_error *
606 send_packfile(struct imsg *imsg, struct gotd_imsgev *iev)
607 {
608 	const struct got_error *err = NULL;
609 	struct repo_read_client *client = &repo_read_client;
610 	struct gotd_imsg_packfile_done idone;
611 	uint8_t packsha1[SHA1_DIGEST_LENGTH];
612 	char hex[SHA1_DIGEST_STRING_LENGTH];
613 	FILE *delta_cache = NULL;
614 	struct imsgbuf ibuf;
615 	struct repo_read_pack_progress_arg pa;
616 	struct got_ratelimit rl;
617 	struct gotd_object_id_array want_ids;
618 	struct gotd_object_id_array have_ids;
619 
620 	log_debug("packfile request received");
621 
622 	memset(&want_ids, 0, sizeof(want_ids));
623 	memset(&have_ids, 0, sizeof(have_ids));
624 
625 	got_ratelimit_init(&rl, 2, 0);
626 
627 	if (client->delta_cache_fd == -1 || client->pack_pipe == -1)
628 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
629 
630 	imsg_init(&ibuf, client->fd);
631 
632 	delta_cache = fdopen(client->delta_cache_fd, "w+");
633 	if (delta_cache == NULL) {
634 		err = got_error_from_errno("fdopen");
635 		goto done;
636 	}
637 	client->delta_cache_fd = -1;
638 
639 	memset(&pa, 0, sizeof(pa));
640 	pa.ibuf = &ibuf;
641 	pa.report_progress = client->report_progress;
642 
643 	err = got_object_idset_for_each(client->want_ids,
644 	    append_object_id, &want_ids);
645 	if (err)
646 		goto done;
647 	err = got_object_idset_for_each(client->have_ids,
648 	   append_object_id, &have_ids);
649 	if (err)
650 		goto done;
651 
652 	err = got_pack_create(packsha1, client->pack_pipe, delta_cache,
653 	    have_ids.ids, have_ids.nids, want_ids.ids, want_ids.nids,
654 	    repo_read.repo, 0, 1, 0, pack_progress, &pa, &rl,
655 	    check_cancelled, NULL);
656 	if (err)
657 		goto done;
658 
659 	if (log_getverbose() > 0 &&
660 	    got_sha1_digest_to_str(packsha1, hex, sizeof(hex)))
661 		log_debug("sent pack-%s.pack", hex);
662 
663 	memset(&idone, 0, sizeof(idone));
664 	idone.client_id = client->id;
665 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_PACKFILE_DONE,
666 	    PROC_REPO_READ, -1, &idone, sizeof(idone)) == -1)
667 		err = got_error_from_errno("imsg compose PACKFILE_DONE");
668 done:
669 	if (delta_cache != NULL && fclose(delta_cache) == EOF && err == NULL)
670 		err = got_error_from_errno("fclose");
671 	imsg_clear(&ibuf);
672 	free(want_ids.ids);
673 	free(have_ids.ids);
674 	return err;
675 }
676 
677 static void
678 repo_read_dispatch_session(int fd, short event, void *arg)
679 {
680 	const struct got_error *err = NULL;
681 	struct gotd_imsgev *iev = arg;
682 	struct imsgbuf *ibuf = &iev->ibuf;
683 	struct imsg imsg;
684 	ssize_t n;
685 	int shut = 0;
686 	struct repo_read_client *client = &repo_read_client;
687 
688 	if (event & EV_READ) {
689 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
690 			fatal("imsg_read error");
691 		if (n == 0)	/* Connection closed. */
692 			shut = 1;
693 	}
694 
695 	if (event & EV_WRITE) {
696 		n = msgbuf_write(&ibuf->w);
697 		if (n == -1 && errno != EAGAIN)
698 			fatal("msgbuf_write");
699 		if (n == 0)	/* Connection closed. */
700 			shut = 1;
701 	}
702 
703 	while (err == NULL && check_cancelled(NULL) == NULL) {
704 		if ((n = imsg_get(ibuf, &imsg)) == -1)
705 			fatal("%s: imsg_get", __func__);
706 		if (n == 0)	/* No more messages. */
707 			break;
708 
709 		if (imsg.hdr.type != GOTD_IMSG_LIST_REFS_INTERNAL &&
710 		    client->id == 0) {
711 			err = got_error(GOT_ERR_PRIVSEP_MSG);
712 			break;
713 		}
714 
715 		switch (imsg.hdr.type) {
716 		case GOTD_IMSG_LIST_REFS_INTERNAL:
717 			err = list_refs(&imsg);
718 			if (err)
719 				log_warnx("ls-refs: %s", err->msg);
720 			break;
721 		case GOTD_IMSG_WANT:
722 			err = recv_want(&imsg);
723 			if (err)
724 				log_warnx("want-line: %s", err->msg);
725 			break;
726 		case GOTD_IMSG_HAVE:
727 			err = recv_have(&imsg);
728 			if (err)
729 				log_warnx("have-line: %s", err->msg);
730 			break;
731 		case GOTD_IMSG_SEND_PACKFILE:
732 			err = receive_delta_cache_fd(&imsg, iev);
733 			if (err)
734 				log_warnx("receiving delta cache: %s",
735 				    err->msg);
736 			break;
737 		case GOTD_IMSG_PACKFILE_PIPE:
738 			err = receive_pack_pipe(&imsg, iev);
739 			if (err) {
740 				log_warnx("receiving pack pipe: %s", err->msg);
741 				break;
742 			}
743 			err = send_packfile(&imsg, iev);
744 			if (err)
745 				log_warnx("sending packfile: %s", err->msg);
746 			break;
747 		default:
748 			log_debug("unexpected imsg %d", imsg.hdr.type);
749 			break;
750 		}
751 
752 		imsg_free(&imsg);
753 	}
754 
755 	if (!shut && check_cancelled(NULL) == NULL) {
756 		if (err &&
757 		    gotd_imsg_send_error_event(iev, PROC_REPO_READ,
758 		        client->id, err) == -1) {
759 			log_warnx("could not send error to parent: %s",
760 			    err->msg);
761 		}
762 		gotd_imsg_event_add(iev);
763 	} else {
764 		/* This pipe is dead. Remove its event handler */
765 		event_del(&iev->ev);
766 		event_loopexit(NULL);
767 	}
768 }
769 
770 static const struct got_error *
771 recv_connect(struct imsg *imsg)
772 {
773 	struct gotd_imsgev *iev = &repo_read.session_iev;
774 	size_t datalen;
775 
776 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
777 	if (datalen != 0)
778 		return got_error(GOT_ERR_PRIVSEP_LEN);
779 	if (imsg->fd == -1)
780 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
781 
782 	if (repo_read.session_fd != -1)
783 		return got_error(GOT_ERR_PRIVSEP_MSG);
784 
785 	repo_read.session_fd = imsg->fd;
786 
787 	imsg_init(&iev->ibuf, repo_read.session_fd);
788 	iev->handler = repo_read_dispatch_session;
789 	iev->events = EV_READ;
790 	iev->handler_arg = NULL;
791 	event_set(&iev->ev, iev->ibuf.fd, EV_READ,
792 	    repo_read_dispatch_session, iev);
793 	gotd_imsg_event_add(iev);
794 
795 	return NULL;
796 }
797 
798 static void
799 repo_read_dispatch(int fd, short event, void *arg)
800 {
801 	const struct got_error *err = NULL;
802 	struct gotd_imsgev *iev = arg;
803 	struct imsgbuf *ibuf = &iev->ibuf;
804 	struct imsg imsg;
805 	ssize_t n;
806 	int shut = 0;
807 	struct repo_read_client *client = &repo_read_client;
808 
809 	if (event & EV_READ) {
810 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
811 			fatal("imsg_read error");
812 		if (n == 0)	/* Connection closed. */
813 			shut = 1;
814 	}
815 
816 	if (event & EV_WRITE) {
817 		n = msgbuf_write(&ibuf->w);
818 		if (n == -1 && errno != EAGAIN)
819 			fatal("msgbuf_write");
820 		if (n == 0)	/* Connection closed. */
821 			shut = 1;
822 	}
823 
824 	while (err == NULL && check_cancelled(NULL) == NULL) {
825 		if ((n = imsg_get(ibuf, &imsg)) == -1)
826 			fatal("%s: imsg_get", __func__);
827 		if (n == 0)	/* No more messages. */
828 			break;
829 
830 		switch (imsg.hdr.type) {
831 		case GOTD_IMSG_CONNECT_REPO_CHILD:
832 			err = recv_connect(&imsg);
833 			break;
834 		default:
835 			log_debug("unexpected imsg %d", imsg.hdr.type);
836 			break;
837 		}
838 
839 		imsg_free(&imsg);
840 	}
841 
842 	if (!shut && check_cancelled(NULL) == NULL) {
843 		if (err &&
844 		    gotd_imsg_send_error_event(iev, PROC_REPO_READ,
845 		        client->id, err) == -1) {
846 			log_warnx("could not send error to parent: %s",
847 			    err->msg);
848 		}
849 		gotd_imsg_event_add(iev);
850 	} else {
851 		/* This pipe is dead. Remove its event handler */
852 		event_del(&iev->ev);
853 		event_loopexit(NULL);
854 	}
855 }
856 
857 void
858 repo_read_main(const char *title, const char *repo_path,
859     int *pack_fds, int *temp_fds)
860 {
861 	const struct got_error *err = NULL;
862 	struct repo_read_client *client = &repo_read_client;
863 	struct gotd_imsgev iev;
864 
865 	client->fd = -1;
866 	client->delta_cache_fd = -1;
867 	client->pack_pipe = -1;
868 	client->have_ids = got_object_idset_alloc();
869 	if (client->have_ids == NULL) {
870 		err = got_error_from_errno("got_object_idset_alloc");
871 		goto done;
872 	}
873 	client->want_ids = got_object_idset_alloc();
874 	if (client->want_ids == NULL) {
875 		err = got_error_from_errno("got_object_idset_alloc");
876 		goto done;
877 	}
878 
879 	repo_read.title = title;
880 	repo_read.pid = getpid();
881 	repo_read.pack_fds = pack_fds;
882 	repo_read.temp_fds = temp_fds;
883 	repo_read.session_fd = -1;
884 	repo_read.session_iev.ibuf.fd = -1;
885 
886 	err = got_repo_open(&repo_read.repo, repo_path, NULL, pack_fds);
887 	if (err)
888 		goto done;
889 	if (!got_repo_is_bare(repo_read.repo)) {
890 		err = got_error_msg(GOT_ERR_NOT_GIT_REPO,
891 		    "bare git repository required");
892 		goto done;
893 	}
894 
895 	got_repo_temp_fds_set(repo_read.repo, temp_fds);
896 
897 	signal(SIGINT, catch_sigint);
898 	signal(SIGTERM, catch_sigterm);
899 	signal(SIGPIPE, SIG_IGN);
900 	signal(SIGHUP, SIG_IGN);
901 
902 	imsg_init(&iev.ibuf, GOTD_FILENO_MSG_PIPE);
903 	iev.handler = repo_read_dispatch;
904 	iev.events = EV_READ;
905 	iev.handler_arg = NULL;
906 	event_set(&iev.ev, iev.ibuf.fd, EV_READ, repo_read_dispatch, &iev);
907 
908 	if (gotd_imsg_compose_event(&iev, GOTD_IMSG_REPO_CHILD_READY,
909 	    PROC_REPO_READ, -1, NULL, 0) == -1) {
910 		err = got_error_from_errno("imsg compose REPO_CHILD_READY");
911 		goto done;
912 	}
913 
914 	event_dispatch();
915 done:
916 	if (err)
917 		log_warnx("%s: %s", title, err->msg);
918 	repo_read_shutdown();
919 }
920 
921 void
922 repo_read_shutdown(void)
923 {
924 	struct repo_read_client *client = &repo_read_client;
925 
926 	log_debug("shutting down");
927 
928 	if (client->have_ids)
929 		got_object_idset_free(client->have_ids);
930 	if (client->want_ids)
931 		got_object_idset_free(client->want_ids);
932 	if (client->fd != -1)
933 		close(client->fd);
934 	if (client->delta_cache_fd != -1)
935 		close(client->delta_cache_fd);
936 	if (client->pack_pipe != -1)
937 		close(client->pack_pipe);
938 
939 	if (repo_read.repo)
940 		got_repo_close(repo_read.repo);
941 	got_repo_pack_fds_close(repo_read.pack_fds);
942 	got_repo_temp_fds_close(repo_read.temp_fds);
943 	if (repo_read.session_fd != -1)
944 		close(repo_read.session_fd);
945 	exit(0);
946 }