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Date:: Sat Mar 30 17:21:23 2024 UTC
Message:: display process title in syslog when a gotd child process exits
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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 "got_compat.h"
18 
19 #include <sys/queue.h>
20 #include <sys/types.h>
21 
22 #include <event.h>
23 #include <errno.h>
24 #include <imsg.h>
25 #include <signal.h>
26 #include <stdlib.h>
27 #include <limits.h>
28 #include <poll.h>
29 #include <stdio.h>
30 #include <string.h>
31 #include <unistd.h>
32 
33 #include "got_error.h"
34 #include "got_cancel.h"
35 #include "got_object.h"
36 #include "got_repository.h"
37 #include "got_reference.h"
38 #include "got_repository_admin.h"
39 #include "got_path.h"
40 
41 #include "got_lib_delta.h"
42 #include "got_lib_object.h"
43 #include "got_lib_object_idset.h"
44 #include "got_lib_hash.h"
45 #include "got_lib_pack.h"
46 #include "got_lib_ratelimit.h"
47 #include "got_lib_pack_create.h"
48 #include "got_lib_poll.h"
49 
50 #include "log.h"
51 #include "gotd.h"
52 #include "repo_read.h"
53 
54 #ifndef nitems
55 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
56 #endif
57 
58 static struct repo_read {
59 	pid_t pid;
60 	const char *title;
61 	struct got_repository *repo;
62 	int *pack_fds;
63 	int *temp_fds;
64 	int session_fd;
65 	struct gotd_imsgev session_iev;
66 	int refs_listed;
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 	imsg_close(ibuf, wbuf);
145 done:
146 	free(target_id);
147 	return err;
148 }
149 
150 static const struct got_error *
151 send_peeled_tag_ref(struct got_reference *ref, struct got_object *obj,
152     struct imsgbuf *ibuf)
153 {
154 	const struct got_error *err = NULL;
155 	struct got_tag_object *tag;
156 	size_t namelen, len;
157 	char *peeled_refname = NULL;
158 	struct got_object_id *id;
159 	struct ibuf *wbuf;
160 
161 	err = got_object_tag_open(&tag, repo_read.repo, obj);
162 	if (err)
163 		return err;
164 
165 	if (asprintf(&peeled_refname, "%s^{}", got_ref_get_name(ref)) == -1) {
166 		err = got_error_from_errno("asprintf");
167 		goto done;
168 	}
169 
170 	id = got_object_tag_get_object_id(tag);
171 	namelen = strlen(peeled_refname);
172 
173 	len = sizeof(struct gotd_imsg_ref) + namelen;
174 	if (len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
175 		err = got_error(GOT_ERR_NO_SPACE);
176 		goto done;
177 	}
178 
179 	wbuf = imsg_create(ibuf, GOTD_IMSG_REF, PROC_REPO_READ,
180 	    repo_read.pid, len);
181 	if (wbuf == NULL) {
182 		err = got_error_from_errno("imsg_create MREF");
183 		goto done;
184 	}
185 
186 	/* Keep in sync with struct gotd_imsg_ref definition. */
187 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
188 		err = got_error_from_errno("imsg_add REF");
189 		goto done;
190 	}
191 	if (imsg_add(wbuf, &namelen, sizeof(namelen)) == -1) {
192 		err = got_error_from_errno("imsg_add REF");
193 		goto done;
194 	}
195 	if (imsg_add(wbuf, peeled_refname, namelen) == -1) {
196 		err = got_error_from_errno("imsg_add REF");
197 		goto done;
198 	}
199 
200 	imsg_close(ibuf, wbuf);
201 done:
202 	got_object_tag_close(tag);
203 	return err;
204 }
205 
206 static const struct got_error *
207 send_ref(struct got_reference *ref, struct imsgbuf *ibuf)
208 {
209 	const struct got_error *err;
210 	const char *refname = got_ref_get_name(ref);
211 	size_t namelen;
212 	struct got_object_id *id = NULL;
213 	struct got_object *obj = NULL;
214 	size_t len;
215 	struct ibuf *wbuf;
216 
217 	namelen = strlen(refname);
218 
219 	len = sizeof(struct gotd_imsg_ref) + namelen;
220 	if (len > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
221 		return got_error(GOT_ERR_NO_SPACE);
222 
223 	err = got_ref_resolve(&id, repo_read.repo, ref);
224 	if (err)
225 		return err;
226 
227 	wbuf = imsg_create(ibuf, GOTD_IMSG_REF, PROC_REPO_READ,
228 	    repo_read.pid, len);
229 	if (wbuf == NULL) {
230 		err = got_error_from_errno("imsg_create REF");
231 		goto done;
232 	}
233 
234 	/* Keep in sync with struct gotd_imsg_ref definition. */
235 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
236 		return got_error_from_errno("imsg_add REF");
237 	if (imsg_add(wbuf, &namelen, sizeof(namelen)) == -1)
238 		return got_error_from_errno("imsg_add REF");
239 	if (imsg_add(wbuf, refname, namelen) == -1)
240 		return got_error_from_errno("imsg_add REF");
241 
242 	imsg_close(ibuf, wbuf);
243 
244 	err = got_object_open(&obj, repo_read.repo, id);
245 	if (err)
246 		goto done;
247 	if (obj->type == GOT_OBJ_TYPE_TAG)
248 		err = send_peeled_tag_ref(ref, obj, ibuf);
249 done:
250 	if (obj)
251 		got_object_close(obj);
252 	free(id);
253 	return err;
254 }
255 
256 static const struct got_error *
257 list_refs(struct imsg *imsg)
258 {
259 	const struct got_error *err;
260 	struct repo_read_client *client = &repo_read_client;
261 	struct got_reflist_head refs;
262 	struct got_reflist_entry *re;
263 	size_t datalen;
264 	struct gotd_imsg_reflist irefs;
265 	struct imsgbuf ibuf;
266 	int client_fd;
267 	struct got_object_id *head_target_id = NULL;
268 
269 	TAILQ_INIT(&refs);
270 
271 	client_fd = imsg_get_fd(imsg);
272 	if (client_fd == -1)
273 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
274 
275 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
276 	if (datalen != 0)
277 		return got_error(GOT_ERR_PRIVSEP_LEN);
278 
279 	if (repo_read.refs_listed) {
280 		return got_error_msg(GOT_ERR_CLIENT_ID,
281 		    "duplicate list-refs request");
282 	}
283 	repo_read.refs_listed = 1;
284 
285 	client->fd = client_fd;
286 
287 	imsg_init(&ibuf, client_fd);
288 
289 	err = got_ref_list(&refs, repo_read.repo, "",
290 	    got_ref_cmp_by_name, NULL);
291 	if (err)
292 		return err;
293 
294 	memset(&irefs, 0, sizeof(irefs));
295 	TAILQ_FOREACH(re, &refs, entry) {
296 		struct got_object_id *id;
297 		int obj_type;
298 
299 		if (got_ref_is_symbolic(re->ref)) {
300 			const char *refname = got_ref_get_name(re->ref);
301 			if (strcmp(refname, GOT_REF_HEAD) != 0)
302 				continue;
303 			err = got_ref_resolve(&head_target_id, repo_read.repo,
304 			    re->ref);
305 			if (err) {
306 				if (err->code != GOT_ERR_NOT_REF)
307 					return err;
308 				/*
309 				 * HEAD points to a non-existent branch.
310 				 * Do not advertise it.
311 				 * Matches git-daemon's behaviour.
312 				 */
313 				head_target_id = NULL;
314 				err = NULL;
315 			} else
316 				irefs.nrefs++;
317 			continue;
318 		}
319 
320 		irefs.nrefs++;
321 
322 		/* Account for a peeled tag refs. */
323 		err = got_ref_resolve(&id, repo_read.repo, re->ref);
324 		if (err)
325 			goto done;
326 		err = got_object_get_type(&obj_type, repo_read.repo, id);
327 		free(id);
328 		if (err)
329 			goto done;
330 		if (obj_type == GOT_OBJ_TYPE_TAG)
331 			irefs.nrefs++;
332 	}
333 
334 	if (imsg_compose(&ibuf, GOTD_IMSG_REFLIST, PROC_REPO_READ,
335 	    repo_read.pid, -1, &irefs, sizeof(irefs)) == -1) {
336 		err = got_error_from_errno("imsg_compose REFLIST");
337 		goto done;
338 	}
339 
340 	/*
341 	 * Send the HEAD symref first. In Git-protocol versions < 2
342 	 * the HEAD symref must be announced on the initial line of
343 	 * the server's ref advertisement.
344 	 * For now, we do not advertise symrefs other than HEAD.
345 	 */
346 	TAILQ_FOREACH(re, &refs, entry) {
347 		if (!got_ref_is_symbolic(re->ref) ||
348 		    strcmp(got_ref_get_name(re->ref), GOT_REF_HEAD) != 0 ||
349 		    head_target_id == NULL)
350 			continue;
351 		err = send_symref(re->ref, head_target_id, &ibuf);
352 		if (err)
353 			goto done;
354 		break;
355 	}
356 	TAILQ_FOREACH(re, &refs, entry) {
357 		if (got_ref_is_symbolic(re->ref))
358 			continue;
359 		err = send_ref(re->ref, &ibuf);
360 		if (err)
361 			goto done;
362 	}
363 
364 	err = gotd_imsg_flush(&ibuf);
365 done:
366 	got_ref_list_free(&refs);
367 	imsg_clear(&ibuf);
368 	return err;
369 }
370 
371 static const struct got_error *
372 append_object_id(struct got_object_id *id, void *data, void *arg)
373 {
374 	struct gotd_object_id_array *array = arg;
375 	const size_t alloc_chunksz = 256;
376 
377 	if (array->ids == NULL) {
378 		array->ids = reallocarray(NULL, alloc_chunksz,
379 		    sizeof(*array->ids));
380 		if (array->ids == NULL)
381 			return got_error_from_errno("reallocarray");
382 		array->nalloc = alloc_chunksz;
383 		array->nids = 0;
384 	} else if (array->nalloc <= array->nids) {
385 		struct got_object_id **new;
386 		new = recallocarray(array->ids, array->nalloc,
387 		    array->nalloc + alloc_chunksz, sizeof(*new));
388 		if (new == NULL)
389 			return got_error_from_errno("recallocarray");
390 		array->ids = new;
391 		array->nalloc += alloc_chunksz;
392 	}
393 
394 	array->ids[array->nids] = id;
395 	array->nids++;
396 	return NULL;
397 }
398 
399 static const struct got_error *
400 recv_want(struct imsg *imsg)
401 {
402 	const struct got_error *err;
403 	struct repo_read_client *client = &repo_read_client;
404 	struct gotd_imsg_want iwant;
405 	size_t datalen;
406 	char hex[SHA1_DIGEST_STRING_LENGTH];
407 	struct got_object_id id;
408 	int obj_type;
409 	struct imsgbuf ibuf;
410 
411 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
412 	if (datalen != sizeof(iwant))
413 		return got_error(GOT_ERR_PRIVSEP_LEN);
414 	memcpy(&iwant, imsg->data, sizeof(iwant));
415 
416 	memset(&id, 0, sizeof(id));
417 	memcpy(id.sha1, iwant.object_id, SHA1_DIGEST_LENGTH);
418 
419 	if (log_getverbose() > 0 &&
420 	    got_sha1_digest_to_str(id.sha1, hex, sizeof(hex)))
421 		log_debug("client wants %s", hex);
422 
423 	imsg_init(&ibuf, client->fd);
424 
425 	err = got_object_get_type(&obj_type, repo_read.repo, &id);
426 	if (err)
427 		return err;
428 
429 	if (obj_type != GOT_OBJ_TYPE_COMMIT &&
430 	    obj_type != GOT_OBJ_TYPE_TAG)
431 		return got_error(GOT_ERR_OBJ_TYPE);
432 
433 	if (!got_object_idset_contains(client->want_ids, &id)) {
434 		err = got_object_idset_add(client->want_ids, &id, NULL);
435 		if (err)
436 			return err;
437 	}
438 
439 	gotd_imsg_send_ack(&id, &ibuf, PROC_REPO_READ, repo_read.pid);
440 	imsg_clear(&ibuf);
441 	return err;
442 }
443 
444 static const struct got_error *
445 recv_have(struct imsg *imsg)
446 {
447 	const struct got_error *err;
448 	struct repo_read_client *client = &repo_read_client;
449 	struct gotd_imsg_have ihave;
450 	size_t datalen;
451 	char hex[SHA1_DIGEST_STRING_LENGTH];
452 	struct got_object_id id;
453 	int obj_type;
454 	struct imsgbuf ibuf;
455 
456 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
457 	if (datalen != sizeof(ihave))
458 		return got_error(GOT_ERR_PRIVSEP_LEN);
459 	memcpy(&ihave, imsg->data, sizeof(ihave));
460 
461 	memset(&id, 0, sizeof(id));
462 	memcpy(id.sha1, ihave.object_id, SHA1_DIGEST_LENGTH);
463 
464 	if (log_getverbose() > 0 &&
465 	    got_sha1_digest_to_str(id.sha1, hex, sizeof(hex)))
466 		log_debug("client has %s", hex);
467 
468 	imsg_init(&ibuf, client->fd);
469 
470 	err = got_object_get_type(&obj_type, repo_read.repo, &id);
471 	if (err) {
472 		if (err->code == GOT_ERR_NO_OBJ) {
473 			gotd_imsg_send_nak(&id, &ibuf,
474 			    PROC_REPO_READ, repo_read.pid);
475 			err = NULL;
476 		}
477 		goto done;
478 	}
479 
480 	if (obj_type != GOT_OBJ_TYPE_COMMIT &&
481 	    obj_type != GOT_OBJ_TYPE_TAG) {
482 		gotd_imsg_send_nak(&id, &ibuf, PROC_REPO_READ, repo_read.pid);
483 		err = got_error(GOT_ERR_OBJ_TYPE);
484 		goto done;
485 	}
486 
487 	if (!got_object_idset_contains(client->have_ids, &id)) {
488 		err = got_object_idset_add(client->have_ids, &id, NULL);
489 		if (err)
490 			goto done;
491 	}
492 
493 	gotd_imsg_send_ack(&id, &ibuf, PROC_REPO_READ, repo_read.pid);
494 done:
495 	imsg_clear(&ibuf);
496 	return err;
497 }
498 
499 struct repo_read_pack_progress_arg {
500 	int report_progress;
501 	struct imsgbuf *ibuf;
502 	int sent_ready;
503 };
504 
505 static const struct got_error *
506 pack_progress(void *arg, int ncolored, int nfound, int ntrees,
507     off_t packfile_size, int ncommits, int nobj_total, int nobj_deltify,
508     int nobj_written)
509 {
510 	struct repo_read_pack_progress_arg *a = arg;
511 	struct gotd_imsg_packfile_progress iprog;
512 	int ret;
513 
514 	if (!a->report_progress)
515 		return NULL;
516 	if (packfile_size > 0 && a->sent_ready)
517 		return NULL;
518 
519 	memset(&iprog, 0, sizeof(iprog));
520 	iprog.ncolored = ncolored;
521 	iprog.nfound = nfound;
522 	iprog.ntrees = ntrees;
523 	iprog.packfile_size = packfile_size;
524 	iprog.ncommits = ncommits;
525 	iprog.nobj_total = nobj_total;
526 	iprog.nobj_deltify = nobj_deltify;
527 	iprog.nobj_written = nobj_written;
528 
529 	/* Using synchronous writes since we are blocking the event loop. */
530 	if (packfile_size == 0) {
531 		ret = imsg_compose(a->ibuf, GOTD_IMSG_PACKFILE_PROGRESS,
532 		    PROC_REPO_READ, repo_read.pid, -1, &iprog, sizeof(iprog));
533 		if (ret == -1) {
534 			return got_error_from_errno("imsg compose "
535 			    "PACKFILE_PROGRESS");
536 		}
537 	} else {
538 		a->sent_ready = 1;
539 		ret = imsg_compose(a->ibuf, GOTD_IMSG_PACKFILE_READY,
540 		    PROC_REPO_READ, repo_read.pid, -1, &iprog, sizeof(iprog));
541 		if (ret == -1) {
542 			return got_error_from_errno("imsg compose "
543 			    "PACKFILE_READY");
544 		}
545 	}
546 
547 	return gotd_imsg_flush(a->ibuf);
548 }
549 
550 static const struct got_error *
551 receive_delta_cache_fd(struct imsg *imsg,
552     struct gotd_imsgev *iev)
553 {
554 	struct repo_read_client *client = &repo_read_client;
555 	struct gotd_imsg_send_packfile ireq;
556 	size_t datalen;
557 
558 	log_debug("receiving delta cache file");
559 
560 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
561 	if (datalen != sizeof(ireq))
562 		return got_error(GOT_ERR_PRIVSEP_LEN);
563 	memcpy(&ireq, imsg->data, sizeof(ireq));
564 
565 	if (client->delta_cache_fd != -1)
566 		return got_error(GOT_ERR_PRIVSEP_MSG);
567 
568 	client->delta_cache_fd = imsg_get_fd(imsg);
569 	if (client->delta_cache_fd == -1)
570 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
571 
572 	client->report_progress = ireq.report_progress;
573 	return NULL;
574 }
575 
576 static const struct got_error *
577 receive_pack_pipe(struct imsg *imsg, struct gotd_imsgev *iev)
578 {
579 	struct repo_read_client *client = &repo_read_client;
580 	size_t datalen;
581 
582 	log_debug("receiving pack pipe descriptor");
583 
584 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
585 	if (datalen != 0)
586 		return got_error(GOT_ERR_PRIVSEP_LEN);
587 
588 	if (client->pack_pipe != -1)
589 		return got_error(GOT_ERR_PRIVSEP_MSG);
590 
591 	client->pack_pipe = imsg_get_fd(imsg);
592 	if (client->pack_pipe == -1)
593 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
594 
595 	return NULL;
596 }
597 
598 static const struct got_error *
599 send_packfile(struct imsg *imsg, struct gotd_imsgev *iev)
600 {
601 	const struct got_error *err = NULL;
602 	struct repo_read_client *client = &repo_read_client;
603 	uint8_t packsha1[SHA1_DIGEST_LENGTH];
604 	char hex[SHA1_DIGEST_STRING_LENGTH];
605 	FILE *delta_cache = NULL;
606 	struct imsgbuf ibuf;
607 	struct repo_read_pack_progress_arg pa;
608 	struct got_ratelimit rl;
609 	struct gotd_object_id_array want_ids;
610 	struct gotd_object_id_array have_ids;
611 
612 	log_debug("packfile request received");
613 
614 	memset(&want_ids, 0, sizeof(want_ids));
615 	memset(&have_ids, 0, sizeof(have_ids));
616 
617 	got_ratelimit_init(&rl, 2, 0);
618 
619 	if (client->delta_cache_fd == -1 || client->pack_pipe == -1)
620 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
621 
622 	imsg_init(&ibuf, client->fd);
623 
624 	delta_cache = fdopen(client->delta_cache_fd, "w+");
625 	if (delta_cache == NULL) {
626 		err = got_error_from_errno("fdopen");
627 		goto done;
628 	}
629 	client->delta_cache_fd = -1;
630 
631 	memset(&pa, 0, sizeof(pa));
632 	pa.ibuf = &ibuf;
633 	pa.report_progress = client->report_progress;
634 
635 	err = got_object_idset_for_each(client->want_ids,
636 	    append_object_id, &want_ids);
637 	if (err)
638 		goto done;
639 	err = got_object_idset_for_each(client->have_ids,
640 	   append_object_id, &have_ids);
641 	if (err)
642 		goto done;
643 
644 	err = got_pack_create(packsha1, client->pack_pipe, delta_cache,
645 	    have_ids.ids, have_ids.nids, want_ids.ids, want_ids.nids,
646 	    repo_read.repo, 0, 1, 0, pack_progress, &pa, &rl,
647 	    check_cancelled, NULL);
648 	if (err)
649 		goto done;
650 
651 	if (log_getverbose() > 0 &&
652 	    got_sha1_digest_to_str(packsha1, hex, sizeof(hex)))
653 		log_debug("sent pack-%s.pack", hex);
654 
655 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_PACKFILE_DONE,
656 	    PROC_REPO_READ, -1, NULL, 0) == -1)
657 		err = got_error_from_errno("imsg compose PACKFILE_DONE");
658 done:
659 	if (client->delta_cache_fd != -1 &&
660 	    close(client->delta_cache_fd) == -1 && err == NULL)
661 		err = got_error_from_errno("close");
662 	client->delta_cache_fd = -1;
663 	if (delta_cache != NULL && fclose(delta_cache) == EOF && err == NULL)
664 		err = got_error_from_errno("fclose");
665 	imsg_clear(&ibuf);
666 	free(want_ids.ids);
667 	free(have_ids.ids);
668 	return err;
669 }
670 
671 static void
672 repo_read_dispatch_session(int fd, short event, void *arg)
673 {
674 	const struct got_error *err = NULL;
675 	struct gotd_imsgev *iev = arg;
676 	struct imsgbuf *ibuf = &iev->ibuf;
677 	struct imsg imsg;
678 	ssize_t n;
679 	int shut = 0;
680 	struct repo_read_client *client = &repo_read_client;
681 
682 	if (event & EV_READ) {
683 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
684 			fatal("imsg_read error");
685 		if (n == 0)	/* Connection closed. */
686 			shut = 1;
687 	}
688 
689 	if (event & EV_WRITE) {
690 		n = msgbuf_write(&ibuf->w);
691 		if (n == -1 && errno != EAGAIN)
692 			fatal("msgbuf_write");
693 		if (n == 0)	/* Connection closed. */
694 			shut = 1;
695 	}
696 
697 	while (err == NULL && check_cancelled(NULL) == NULL) {
698 		if ((n = imsg_get(ibuf, &imsg)) == -1)
699 			fatal("%s: imsg_get", __func__);
700 		if (n == 0)	/* No more messages. */
701 			break;
702 
703 		if (imsg.hdr.type != GOTD_IMSG_LIST_REFS_INTERNAL &&
704 		    !repo_read.refs_listed) {
705 			err = got_error(GOT_ERR_PRIVSEP_MSG);
706 			break;
707 		}
708 
709 		switch (imsg.hdr.type) {
710 		case GOTD_IMSG_LIST_REFS_INTERNAL:
711 			err = list_refs(&imsg);
712 			if (err)
713 				log_warnx("ls-refs: %s", err->msg);
714 			break;
715 		case GOTD_IMSG_WANT:
716 			err = recv_want(&imsg);
717 			if (err)
718 				log_warnx("want-line: %s", err->msg);
719 			break;
720 		case GOTD_IMSG_HAVE:
721 			err = recv_have(&imsg);
722 			if (err)
723 				log_warnx("have-line: %s", err->msg);
724 			break;
725 		case GOTD_IMSG_SEND_PACKFILE:
726 			err = receive_delta_cache_fd(&imsg, iev);
727 			if (err)
728 				log_warnx("receiving delta cache: %s",
729 				    err->msg);
730 			break;
731 		case GOTD_IMSG_PACKFILE_PIPE:
732 			err = receive_pack_pipe(&imsg, iev);
733 			if (err) {
734 				log_warnx("receiving pack pipe: %s", err->msg);
735 				break;
736 			}
737 			err = send_packfile(&imsg, iev);
738 			if (err)
739 				log_warnx("sending packfile: %s", err->msg);
740 			break;
741 		default:
742 			log_debug("unexpected imsg %d", imsg.hdr.type);
743 			break;
744 		}
745 
746 		imsg_free(&imsg);
747 	}
748 
749 	if (!shut && check_cancelled(NULL) == NULL) {
750 		if (err &&
751 		    gotd_imsg_send_error_event(iev, PROC_REPO_READ,
752 		        client->id, err) == -1) {
753 			log_warnx("could not send error to parent: %s",
754 			    err->msg);
755 		}
756 		gotd_imsg_event_add(iev);
757 	} else {
758 		/* This pipe is dead. Remove its event handler */
759 		event_del(&iev->ev);
760 		event_loopexit(NULL);
761 	}
762 }
763 
764 static const struct got_error *
765 recv_connect(struct imsg *imsg)
766 {
767 	struct gotd_imsgev *iev = &repo_read.session_iev;
768 	size_t datalen;
769 
770 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
771 	if (datalen != 0)
772 		return got_error(GOT_ERR_PRIVSEP_LEN);
773 
774 	if (repo_read.session_fd != -1)
775 		return got_error(GOT_ERR_PRIVSEP_MSG);
776 
777 	repo_read.session_fd = imsg_get_fd(imsg);
778 	if (repo_read.session_fd == -1)
779 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
780 
781 	imsg_init(&iev->ibuf, repo_read.session_fd);
782 	iev->handler = repo_read_dispatch_session;
783 	iev->events = EV_READ;
784 	iev->handler_arg = NULL;
785 	event_set(&iev->ev, iev->ibuf.fd, EV_READ,
786 	    repo_read_dispatch_session, iev);
787 	gotd_imsg_event_add(iev);
788 
789 	return NULL;
790 }
791 
792 static void
793 repo_read_dispatch(int fd, short event, void *arg)
794 {
795 	const struct got_error *err = NULL;
796 	struct gotd_imsgev *iev = arg;
797 	struct imsgbuf *ibuf = &iev->ibuf;
798 	struct imsg imsg;
799 	ssize_t n;
800 	int shut = 0;
801 	struct repo_read_client *client = &repo_read_client;
802 
803 	if (event & EV_READ) {
804 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
805 			fatal("imsg_read error");
806 		if (n == 0)	/* Connection closed. */
807 			shut = 1;
808 	}
809 
810 	if (event & EV_WRITE) {
811 		n = msgbuf_write(&ibuf->w);
812 		if (n == -1 && errno != EAGAIN)
813 			fatal("msgbuf_write");
814 		if (n == 0)	/* Connection closed. */
815 			shut = 1;
816 	}
817 
818 	while (err == NULL && check_cancelled(NULL) == NULL) {
819 		if ((n = imsg_get(ibuf, &imsg)) == -1)
820 			fatal("%s: imsg_get", __func__);
821 		if (n == 0)	/* No more messages. */
822 			break;
823 
824 		switch (imsg.hdr.type) {
825 		case GOTD_IMSG_CONNECT_REPO_CHILD:
826 			err = recv_connect(&imsg);
827 			break;
828 		default:
829 			log_debug("unexpected imsg %d", imsg.hdr.type);
830 			break;
831 		}
832 
833 		imsg_free(&imsg);
834 	}
835 
836 	if (!shut && check_cancelled(NULL) == NULL) {
837 		if (err &&
838 		    gotd_imsg_send_error_event(iev, PROC_REPO_READ,
839 		        client->id, err) == -1) {
840 			log_warnx("could not send error to parent: %s",
841 			    err->msg);
842 		}
843 		gotd_imsg_event_add(iev);
844 	} else {
845 		/* This pipe is dead. Remove its event handler */
846 		event_del(&iev->ev);
847 		event_loopexit(NULL);
848 	}
849 }
850 
851 void
852 repo_read_main(const char *title, const char *repo_path,
853     int *pack_fds, int *temp_fds)
854 {
855 	const struct got_error *err = NULL;
856 	struct repo_read_client *client = &repo_read_client;
857 	struct gotd_imsgev iev;
858 
859 	client->fd = -1;
860 	client->delta_cache_fd = -1;
861 	client->pack_pipe = -1;
862 	client->have_ids = got_object_idset_alloc();
863 	if (client->have_ids == NULL) {
864 		err = got_error_from_errno("got_object_idset_alloc");
865 		goto done;
866 	}
867 	client->want_ids = got_object_idset_alloc();
868 	if (client->want_ids == NULL) {
869 		err = got_error_from_errno("got_object_idset_alloc");
870 		goto done;
871 	}
872 
873 	repo_read.title = title;
874 	repo_read.pid = getpid();
875 	repo_read.pack_fds = pack_fds;
876 	repo_read.temp_fds = temp_fds;
877 	repo_read.session_fd = -1;
878 	repo_read.session_iev.ibuf.fd = -1;
879 
880 	err = got_repo_open(&repo_read.repo, repo_path, NULL, pack_fds);
881 	if (err)
882 		goto done;
883 	if (!got_repo_is_bare(repo_read.repo)) {
884 		err = got_error_msg(GOT_ERR_NOT_GIT_REPO,
885 		    "bare git repository required");
886 		goto done;
887 	}
888 
889 	got_repo_temp_fds_set(repo_read.repo, temp_fds);
890 
891 	signal(SIGINT, catch_sigint);
892 	signal(SIGTERM, catch_sigterm);
893 	signal(SIGPIPE, SIG_IGN);
894 	signal(SIGHUP, SIG_IGN);
895 
896 	imsg_init(&iev.ibuf, GOTD_FILENO_MSG_PIPE);
897 	iev.handler = repo_read_dispatch;
898 	iev.events = EV_READ;
899 	iev.handler_arg = NULL;
900 	event_set(&iev.ev, iev.ibuf.fd, EV_READ, repo_read_dispatch, &iev);
901 
902 	if (gotd_imsg_compose_event(&iev, GOTD_IMSG_REPO_CHILD_READY,
903 	    PROC_REPO_READ, -1, NULL, 0) == -1) {
904 		err = got_error_from_errno("imsg compose REPO_CHILD_READY");
905 		goto done;
906 	}
907 
908 	event_dispatch();
909 done:
910 	if (err)
911 		log_warnx("%s: %s", title, err->msg);
912 	repo_read_shutdown();
913 }
914 
915 void
916 repo_read_shutdown(void)
917 {
918 	struct repo_read_client *client = &repo_read_client;
919 
920 	log_debug("%s: shutting down", repo_read.title);
921 
922 	if (client->have_ids)
923 		got_object_idset_free(client->have_ids);
924 	if (client->want_ids)
925 		got_object_idset_free(client->want_ids);
926 	if (client->fd != -1)
927 		close(client->fd);
928 	if (client->delta_cache_fd != -1)
929 		close(client->delta_cache_fd);
930 	if (client->pack_pipe != -1)
931 		close(client->pack_pipe);
932 
933 	if (repo_read.repo)
934 		got_repo_close(repo_read.repo);
935 	got_repo_pack_fds_close(repo_read.pack_fds);
936 	got_repo_temp_fds_close(repo_read.temp_fds);
937 	if (repo_read.session_fd != -1)
938 		close(repo_read.session_fd);
939 	exit(0);
940 }