1 /*
2  * Copyright (c) 2018, 2019 Ori Bernstein <ori@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/resource.h>
24 #include <sys/socket.h>
25 
26 #include <endian.h>
27 #include <errno.h>
28 #include <err.h>
29 #include <fcntl.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <stdint.h>
34 #include <sha1.h>
35 #include <unistd.h>
36 #include <zlib.h>
37 #include <ctype.h>
38 #include <limits.h>
39 #include <imsg.h>
40 #include <time.h>
41 #include <uuid.h>
42 #include <netdb.h>
43 #include <netinet/in.h>
44 
45 #include "got_error.h"
46 #include "got_reference.h"
47 #include "got_repository.h"
48 #include "got_path.h"
49 #include "got_cancel.h"
50 #include "got_worktree.h"
51 #include "got_object.h"
52 #include "got_opentemp.h"
53 #include "got_fetch.h"
54 
55 #include "got_lib_delta.h"
56 #include "got_lib_inflate.h"
57 #include "got_lib_object.h"
58 #include "got_lib_object_parse.h"
59 #include "got_lib_object_create.h"
60 #include "got_lib_pack.h"
61 #include "got_lib_sha1.h"
62 #include "got_lib_privsep.h"
63 #include "got_lib_object_cache.h"
64 #include "got_lib_repository.h"
65 
66 #ifndef nitems
67 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
68 #endif
69 
70 #ifndef ssizeof
71 #define ssizeof(_x) ((ssize_t)(sizeof(_x)))
72 #endif
73 
74 #ifndef MIN
75 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
76 #endif
77 
78 static int
79 hassuffix(char *base, char *suf)
80 {
81 	int nb, ns;
82 
83 	nb = strlen(base);
84 	ns = strlen(suf);
85 	if (ns <= nb && strcmp(base + (nb - ns), suf) == 0)
86 		return 1;
87 	return 0;
88 }
89 
90 static const struct got_error *
91 dial_ssh(pid_t *fetchpid, int *fetchfd, const char *host, const char *port,
92     const char *path, const char *direction, int verbosity)
93 {
94 	const struct got_error *error = NULL;
95 	int pid, pfd[2];
96 	char cmd[64];
97 	char *argv[11];
98 	int i = 0, j;
99 
100 	*fetchpid = -1;
101 	*fetchfd = -1;
102 
103 	argv[i++] = GOT_FETCH_PATH_SSH;
104 	if (port != NULL) {
105 		argv[i++] = "-p";
106 		argv[i++] = (char *)port;
107 	}
108 	if (verbosity == -1) {
109 		argv[i++] = "-q";
110 	} else {
111 		/* ssh(1) allows up to 3 "-v" options. */
112 		for (j = 0; j < MIN(3, verbosity); j++)
113 			argv[i++] = "-v";
114 	}
115 	argv[i++] = "--";
116 	argv[i++] = (char *)host;
117 	argv[i++] = (char *)cmd;
118 	argv[i++] = (char *)path;
119 	argv[i++] = NULL;
120 
121 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pfd) == -1)
122 		return got_error_from_errno("socketpair");
123 
124 	pid = fork();
125 	if (pid == -1) {
126 		error = got_error_from_errno("fork");
127 		close(pfd[0]);
128 		close(pfd[1]);
129 		return error;
130 	} else if (pid == 0) {
131 		int n;
132 		if (close(pfd[1]) == -1)
133 			err(1, "close");
134 		if (dup2(pfd[0], 0) == -1)
135 			err(1, "dup2");
136 		if (dup2(pfd[0], 1) == -1)
137 			err(1, "dup2");
138 		n = snprintf(cmd, sizeof(cmd), "git-%s-pack", direction);
139 		if (n < 0 || n >= ssizeof(cmd))
140 			err(1, "snprintf");
141 		if (execv(GOT_FETCH_PATH_SSH, argv) == -1)
142 			err(1, "execv");
143 		abort(); /* not reached */
144 	} else {
145 		if (close(pfd[0]) == -1)
146 			return got_error_from_errno("close");
147 		*fetchpid = pid;
148 		*fetchfd = pfd[1];
149 		return NULL;
150 	}
151 }
152 
153 static const struct got_error *
154 dial_git(int *fetchfd, const char *host, const char *port, const char *path,
155     const char *direction)
156 {
157 	const struct got_error *err = NULL;
158 	struct addrinfo hints, *servinfo, *p;
159 	char *cmd = NULL;
160 	int fd = -1, len, r, eaicode;
161 
162 	*fetchfd = -1;
163 
164 	if (port == NULL)
165 		port = GOT_DEFAULT_GIT_PORT_STR;
166 
167 	memset(&hints, 0, sizeof hints);
168 	hints.ai_family = AF_UNSPEC;
169 	hints.ai_socktype = SOCK_STREAM;
170 	eaicode = getaddrinfo(host, port, &hints, &servinfo);
171 	if (eaicode) {
172 		char msg[512];
173 		snprintf(msg, sizeof(msg), "%s: %s", host,
174 		    gai_strerror(eaicode));
175 		return got_error_msg(GOT_ERR_ADDRINFO, msg);
176 	}
177 
178 	for (p = servinfo; p != NULL; p = p->ai_next) {
179 		if ((fd = socket(p->ai_family, p->ai_socktype,
180 		    p->ai_protocol)) == -1)
181 			continue;
182 		if (connect(fd, p->ai_addr, p->ai_addrlen) == 0) {
183 			err = NULL;
184 			break;
185 		}
186 		err = got_error_from_errno("connect");
187 		close(fd);
188 	}
189 	if (p == NULL)
190 		goto done;
191 
192 	if (asprintf(&cmd, "git-%s-pack %s", direction, path) == -1) {
193 		err = got_error_from_errno("asprintf");
194 		goto done;
195 	}
196 	len = 4 + strlen(cmd) + 1 + strlen("host=") + strlen(host) + 1;
197 	r = dprintf(fd, "%04x%s%chost=%s%c", len, cmd, '\0', host, '\0');
198 	if (r < 0)
199 		err = got_error_from_errno("dprintf");
200 done:
201 	free(cmd);
202 	if (err) {
203 		if (fd != -1)
204 			close(fd);
205 	} else
206 		*fetchfd = fd;
207 	return err;
208 }
209 
210 const struct got_error *
211 got_fetch_connect(pid_t *fetchpid, int *fetchfd, const char *proto,
212     const char *host, const char *port, const char *server_path, int verbosity)
213 {
214 	const struct got_error *err = NULL;
215 
216 	*fetchpid = -1;
217 	*fetchfd = -1;
218 
219 	if (strcmp(proto, "ssh") == 0 || strcmp(proto, "git+ssh") == 0)
220 		err = dial_ssh(fetchpid, fetchfd, host, port, server_path,
221 		    "upload", verbosity);
222 	else if (strcmp(proto, "git") == 0)
223 		err = dial_git(fetchfd, host, port, server_path, "upload");
224 	else if (strcmp(proto, "http") == 0 || strcmp(proto, "git+http") == 0)
225 		err = got_error_path(proto, GOT_ERR_NOT_IMPL);
226 	else
227 		err = got_error_path(proto, GOT_ERR_BAD_PROTO);
228 	return err;
229 }
230 
231 const struct got_error *
232 got_fetch_parse_uri(char **proto, char **host, char **port,
233     char **server_path, char **repo_name, const char *uri)
234 {
235 	const struct got_error *err = NULL;
236 	char *s, *p, *q;
237 	int n;
238 
239 	*proto = *host = *port = *server_path = *repo_name = NULL;
240 
241 	p = strstr(uri, "://");
242 	if (!p) {
243 		/* Try parsing Git's "scp" style URL syntax. */
244 		*proto = strdup("ssh");
245 		if (proto == NULL) {
246 			err = got_error_from_errno("strdup");
247 			goto done;
248 		}
249 		s = (char *)uri;
250 		q = strchr(s, ':');
251 		if (q == NULL) {
252 			err = got_error(GOT_ERR_PARSE_URI);
253 			goto done;
254 		}
255 		/* No slashes allowed before first colon. */
256 		p = strchr(s, '/');
257 		if (p && q > p) {
258 			err = got_error(GOT_ERR_PARSE_URI);
259 			goto done;
260 		}
261 		*host = strndup(s, q - s);
262 		if (*host == NULL) {
263 			err = got_error_from_errno("strndup");
264 			goto done;
265 		}
266 		p = q + 1;
267 	} else {
268 		*proto = strndup(uri, p - uri);
269 		if (proto == NULL) {
270 			err = got_error_from_errno("strndup");
271 			goto done;
272 		}
273 		s = p + 3;
274 
275 		p = strstr(s, "/");
276 		if (p == NULL || strlen(p) == 1) {
277 			err = got_error(GOT_ERR_PARSE_URI);
278 			goto done;
279 		}
280 
281 		q = memchr(s, ':', p - s);
282 		if (q) {
283 			*host = strndup(s, q - s);
284 			if (*host == NULL) {
285 				err = got_error_from_errno("strndup");
286 				goto done;
287 			}
288 			*port = strndup(q + 1, p - (q + 1));
289 			if (*port == NULL) {
290 				err = got_error_from_errno("strndup");
291 				goto done;
292 			}
293 		} else {
294 			*host = strndup(s, p - s);
295 			if (*host == NULL) {
296 				err = got_error_from_errno("strndup");
297 				goto done;
298 			}
299 		}
300 	}
301 
302 	while (p[0] == '/' && p[1] == '/')
303 		p++;
304 	*server_path = strdup(p);
305 	if (*server_path == NULL) {
306 		err = got_error_from_errno("strdup");
307 		goto done;
308 	}
309 	got_path_strip_trailing_slashes(*server_path);
310 
311 	p = strrchr(p, '/');
312 	if (!p || strlen(p) <= 1) {
313 		err = got_error(GOT_ERR_PARSE_URI);
314 		goto done;
315 	}
316 	p++;
317 	n = strlen(p);
318 	if (n == 0) {
319 		err = got_error(GOT_ERR_PARSE_URI);
320 		goto done;
321 	}
322 	if (hassuffix(p, ".git"))
323 		n -= 4;
324 	*repo_name = strndup(p, (p + n) - p);
325 	if (*repo_name == NULL) {
326 		err = got_error_from_errno("strndup");
327 		goto done;
328 	}
329 done:
330 	if (err) {
331 		free(*proto);
332 		*proto = NULL;
333 		free(*host);
334 		*host = NULL;
335 		free(*port);
336 		*port = NULL;
337 		free(*server_path);
338 		*server_path = NULL;
339 		free(*repo_name);
340 		*repo_name = NULL;
341 	}
342 	return err;
343 }
344 
345 const struct got_error*
346 got_fetch_pack(struct got_object_id **pack_hash, struct got_pathlist_head *refs,
347     struct got_pathlist_head *symrefs, const char *remote_name,
348     int mirror_references, int fetch_all_branches,
349     struct got_pathlist_head *wanted_branches,
350     struct got_pathlist_head *wanted_refs, int list_refs_only, int verbosity,
351     int fetchfd, struct got_repository *repo,
352     got_fetch_progress_cb progress_cb, void *progress_arg)
353 {
354 	size_t i;
355 	int imsg_fetchfds[2], imsg_idxfds[2];
356 	int packfd = -1, npackfd = -1, idxfd = -1, nidxfd = -1, nfetchfd = -1;
357 	int tmpfds[3];
358 	int fetchstatus, idxstatus, done = 0;
359 	const struct got_error *err;
360 	struct imsgbuf fetchibuf, idxibuf;
361 	pid_t fetchpid, idxpid;
362 	char *tmppackpath = NULL, *tmpidxpath = NULL;
363 	char *packpath = NULL, *idxpath = NULL, *id_str = NULL;
364 	const char *repo_path = NULL;
365 	struct got_pathlist_head have_refs;
366 	struct got_pathlist_entry *pe;
367 	struct got_reflist_head my_refs;
368 	struct got_reflist_entry *re;
369 	off_t packfile_size = 0;
370 	struct got_packfile_hdr pack_hdr;
371 	uint32_t nobj = 0;
372 	char *ref_prefix = NULL;
373 	size_t ref_prefixlen = 0;
374 	char *path;
375 	char *progress = NULL;
376 
377 	*pack_hash = NULL;
378 
379 	/*
380 	 * Prevent fetching of references that won't make any
381 	 * sense outside of the remote repository's context.
382 	 */
383 	TAILQ_FOREACH(pe, wanted_refs, entry) {
384 		const char *refname = pe->path;
385 		if (strncmp(refname, "refs/got/", 9) == 0 ||
386 		    strncmp(refname, "got/", 4) == 0 ||
387 		    strncmp(refname, "refs/remotes/", 13) == 0 ||
388 		    strncmp(refname, "remotes/", 8) == 0)
389 			return got_error_path(refname, GOT_ERR_FETCH_BAD_REF);
390 	}
391 
392 	if (!list_refs_only)
393 		repo_path = got_repo_get_path_git_dir(repo);
394 
395 	for (i = 0; i < nitems(tmpfds); i++)
396 		tmpfds[i] = -1;
397 
398 	TAILQ_INIT(&have_refs);
399 	TAILQ_INIT(&my_refs);
400 
401 	if (!mirror_references) {
402 		if (asprintf(&ref_prefix, "refs/remotes/%s/",
403 		    remote_name) == -1)
404 			return got_error_from_errno("asprintf");
405 		ref_prefixlen = strlen(ref_prefix);
406 	}
407 
408 	if (!list_refs_only) {
409 		err = got_ref_list(&my_refs, repo, NULL,
410 		    got_ref_cmp_by_name, NULL);
411 		if (err)
412 			goto done;
413 	}
414 
415 	TAILQ_FOREACH(re, &my_refs, entry) {
416 		struct got_object_id *id;
417 		const char *refname;
418 
419 		if (got_ref_is_symbolic(re->ref))
420 			continue;
421 
422 		refname = got_ref_get_name(re->ref);
423 
424 		if (mirror_references) {
425 			char *name;
426 			err = got_ref_resolve(&id, repo, re->ref);
427 			if (err)
428 				goto done;
429 			name = strdup(refname);
430 			if (name == NULL) {
431 				err = got_error_from_errno("strdup");
432 				goto done;
433 			}
434 			err = got_pathlist_append(&have_refs, name, id);
435 			if (err)
436 				goto done;
437 			continue;
438 		}
439 
440 		if (strncmp("refs/tags/", refname, 10) == 0) {
441 			char *tagname;
442 
443 			err = got_ref_resolve(&id, repo, re->ref);
444 			if (err)
445 				goto done;
446 			tagname = strdup(refname);
447 			if (tagname == NULL) {
448 				err = got_error_from_errno("strdup");
449 				goto done;
450 			}
451 			err = got_pathlist_append(&have_refs, tagname, id);
452 			if (err) {
453 				free(tagname);
454 				goto done;
455 			}
456 		}
457 
458 		if (strncmp(ref_prefix, refname, ref_prefixlen) == 0) {
459 			char *branchname;
460 
461 			err = got_ref_resolve(&id, repo, re->ref);
462 			if (err)
463 				goto done;
464 
465 			if (asprintf(&branchname, "refs/heads/%s",
466 			    refname + ref_prefixlen) == -1) {
467 				err = got_error_from_errno("asprintf");
468 				goto done;
469 			}
470 			err = got_pathlist_append(&have_refs, branchname, id);
471 			if (err) {
472 				free(branchname);
473 				goto done;
474 			}
475 		}
476 	}
477 
478 	if (list_refs_only) {
479 		packfd = got_opentempfd();
480 		if (packfd == -1) {
481 			err = got_error_from_errno("got_opentempfd");
482 			goto done;
483 		}
484 	} else {
485 		if (asprintf(&path, "%s/%s/fetching.pack",
486 		    repo_path, GOT_OBJECTS_PACK_DIR) == -1) {
487 			err = got_error_from_errno("asprintf");
488 			goto done;
489 		}
490 		err = got_opentemp_named_fd(&tmppackpath, &packfd, path);
491 		free(path);
492 		if (err)
493 			goto done;
494 		if (fchmod(packfd, GOT_DEFAULT_FILE_MODE) != 0) {
495 			err = got_error_from_errno2("fchmod", tmppackpath);
496 			goto done;
497 		}
498 	}
499 	if (list_refs_only) {
500 		idxfd = got_opentempfd();
501 		if (idxfd == -1) {
502 			err = got_error_from_errno("got_opentempfd");
503 			goto done;
504 		}
505 	} else {
506 		if (asprintf(&path, "%s/%s/fetching.idx",
507 		    repo_path, GOT_OBJECTS_PACK_DIR) == -1) {
508 			err = got_error_from_errno("asprintf");
509 			goto done;
510 		}
511 		err = got_opentemp_named_fd(&tmpidxpath, &idxfd, path);
512 		free(path);
513 		if (err)
514 			goto done;
515 		if (fchmod(idxfd, GOT_DEFAULT_FILE_MODE) != 0) {
516 			err = got_error_from_errno2("fchmod", tmpidxpath);
517 			goto done;
518 		}
519 	}
520 	nidxfd = dup(idxfd);
521 	if (nidxfd == -1) {
522 		err = got_error_from_errno("dup");
523 		goto done;
524 	}
525 
526 	for (i = 0; i < nitems(tmpfds); i++) {
527 		tmpfds[i] = got_opentempfd();
528 		if (tmpfds[i] == -1) {
529 			err = got_error_from_errno("got_opentempfd");
530 			goto done;
531 		}
532 	}
533 
534 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fetchfds) == -1) {
535 		err = got_error_from_errno("socketpair");
536 		goto done;
537 	}
538 
539 	fetchpid = fork();
540 	if (fetchpid == -1) {
541 		err = got_error_from_errno("fork");
542 		goto done;
543 	} else if (fetchpid == 0){
544 		got_privsep_exec_child(imsg_fetchfds,
545 		    GOT_PATH_PROG_FETCH_PACK, tmppackpath);
546 	}
547 
548 	if (close(imsg_fetchfds[1]) == -1) {
549 		err = got_error_from_errno("close");
550 		goto done;
551 	}
552 	imsg_init(&fetchibuf, imsg_fetchfds[0]);
553 	nfetchfd = dup(fetchfd);
554 	if (nfetchfd == -1) {
555 		err = got_error_from_errno("dup");
556 		goto done;
557 	}
558 	err = got_privsep_send_fetch_req(&fetchibuf, nfetchfd, &have_refs,
559 	    fetch_all_branches, wanted_branches, wanted_refs,
560 	    list_refs_only, verbosity);
561 	if (err != NULL)
562 		goto done;
563 	nfetchfd = -1;
564 	npackfd = dup(packfd);
565 	if (npackfd == -1) {
566 		err = got_error_from_errno("dup");
567 		goto done;
568 	}
569 	err = got_privsep_send_fetch_outfd(&fetchibuf, npackfd);
570 	if (err != NULL)
571 		goto done;
572 	npackfd = -1;
573 
574 	packfile_size = 0;
575 	progress = calloc(GOT_FETCH_PKTMAX, 1);
576 	if (progress == NULL) {
577 		err = got_error_from_errno("calloc");
578 		goto done;
579 	}
580 
581 	*pack_hash = calloc(1, sizeof(**pack_hash));
582 	if (*pack_hash == NULL) {
583 		err = got_error_from_errno("calloc");
584 		goto done;
585 	}
586 
587 	while (!done) {
588 		struct got_object_id *id = NULL;
589 		char *refname = NULL;
590 		char *server_progress = NULL;
591 		off_t packfile_size_cur = 0;
592 
593 		err = got_privsep_recv_fetch_progress(&done,
594 		    &id, &refname, symrefs, &server_progress,
595 		    &packfile_size_cur, (*pack_hash)->sha1, &fetchibuf);
596 		if (err != NULL)
597 			goto done;
598 		if (!done && refname && id) {
599 			err = got_pathlist_insert(NULL, refs, refname, id);
600 			if (err)
601 				goto done;
602 		} else if (!done && server_progress) {
603 			char *p;
604 			/*
605 			 * XXX git-daemon tends to send batched output with
606 			 * lines spanning separate packets. Buffer progress
607 			 * output until we see a CR or LF to avoid giving
608 			 * partial lines of progress output to the callback.
609 			 */
610 			if (strlcat(progress, server_progress,
611 			    GOT_FETCH_PKTMAX) >= GOT_FETCH_PKTMAX) {
612 				progress[0] = '\0'; /* discard */
613 				continue;
614 			}
615 			while ((p = strchr(progress, '\r')) != NULL ||
616 			    (p = strchr(progress, '\n')) != NULL) {
617 				char *s;
618 				size_t n;
619 				char c = *p;
620 				*p = '\0';
621 				if (asprintf(&s, "%s%s", progress,
622 				    c == '\n' ? "\n" : "") == -1) {
623 					err = got_error_from_errno("asprintf");
624 					goto done;
625 				}
626 				err = progress_cb(progress_arg, s,
627 				    packfile_size_cur, 0, 0, 0, 0);
628 				free(s);
629 				if (err)
630 					break;
631 				n = strlen(progress);
632 				if (n < GOT_FETCH_PKTMAX - 1) {
633 					memmove(progress, &progress[n + 1],
634 					    GOT_FETCH_PKTMAX - n - 1);
635 				} else
636 					progress[0] = '\0';
637 			}
638 			free(server_progress);
639 			if (err)
640 				goto done;
641 		} else if (!done && packfile_size_cur != packfile_size) {
642 			err = progress_cb(progress_arg, NULL,
643 			    packfile_size_cur, 0, 0, 0, 0);
644 			if (err)
645 				break;
646 			packfile_size = packfile_size_cur;
647 		}
648 	}
649 	if (waitpid(fetchpid, &fetchstatus, 0) == -1) {
650 		err = got_error_from_errno("waitpid");
651 		goto done;
652 	}
653 
654 	if (lseek(packfd, 0, SEEK_SET) == -1) {
655 		err = got_error_from_errno("lseek");
656 		goto done;
657 	}
658 
659 	/* If zero data was fetched without error we are already up-to-date. */
660 	if (packfile_size == 0) {
661 		free(*pack_hash);
662 		*pack_hash = NULL;
663 		goto done;
664 	} else if (packfile_size < ssizeof(pack_hdr) + SHA1_DIGEST_LENGTH) {
665 		err = got_error_msg(GOT_ERR_BAD_PACKFILE, "short pack file");
666 		goto done;
667 	} else {
668 		ssize_t n;
669 
670 		n = read(packfd, &pack_hdr, ssizeof(pack_hdr));
671 		if (n == -1) {
672 			err = got_error_from_errno("read");
673 			goto done;
674 		}
675 		if (n != ssizeof(pack_hdr)) {
676 			err = got_error(GOT_ERR_IO);
677 			goto done;
678 		}
679 		if (pack_hdr.signature != htobe32(GOT_PACKFILE_SIGNATURE)) {
680 			err = got_error_msg(GOT_ERR_BAD_PACKFILE,
681 			    "bad pack file signature");
682 			goto done;
683 		}
684 		if (pack_hdr.version != htobe32(GOT_PACKFILE_VERSION)) {
685 			err = got_error_msg(GOT_ERR_BAD_PACKFILE,
686 			    "bad pack file version");
687 			goto done;
688 		}
689 		nobj = be32toh(pack_hdr.nobjects);
690 		if (nobj == 0 &&
691 		    packfile_size > ssizeof(pack_hdr) + SHA1_DIGEST_LENGTH)
692 			return got_error_msg(GOT_ERR_BAD_PACKFILE,
693 			    "bad pack file with zero objects");
694 		if (nobj != 0 &&
695 		    packfile_size <= ssizeof(pack_hdr) + SHA1_DIGEST_LENGTH)
696 			return got_error_msg(GOT_ERR_BAD_PACKFILE,
697 			    "empty pack file with non-zero object count");
698 	}
699 
700 	/*
701 	 * If the pack file contains no objects, we may only need to update
702 	 * references in our repository. The caller will take care of that.
703 	 */
704 	if (nobj == 0)
705 		goto done;
706 
707 	if (lseek(packfd, 0, SEEK_SET) == -1) {
708 		err = got_error_from_errno("lseek");
709 		goto done;
710 	}
711  
712 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_idxfds) == -1) {
713 		err = got_error_from_errno("socketpair");
714 		goto done;
715 	}
716 	idxpid = fork();
717 	if (idxpid == -1) {
718 		err= got_error_from_errno("fork");
719 		goto done;
720 	} else if (idxpid == 0)
721 		got_privsep_exec_child(imsg_idxfds,
722 		    GOT_PATH_PROG_INDEX_PACK, tmppackpath);
723 	if (close(imsg_idxfds[1]) == -1) {
724 		err = got_error_from_errno("close");
725 		goto done;
726 	}
727 	imsg_init(&idxibuf, imsg_idxfds[0]);
728 
729 	npackfd = dup(packfd);
730 	if (npackfd == -1) {
731 		err = got_error_from_errno("dup");
732 		goto done;
733 	}
734 	err = got_privsep_send_index_pack_req(&idxibuf, (*pack_hash)->sha1,
735 	    npackfd);
736 	if (err != NULL)
737 		goto done;
738 	npackfd = -1;
739 	err = got_privsep_send_index_pack_outfd(&idxibuf, nidxfd);
740 	if (err != NULL)
741 		goto done;
742 	nidxfd = -1;
743 	for (i = 0; i < nitems(tmpfds); i++) {
744 		err = got_privsep_send_tmpfd(&idxibuf, tmpfds[i]);
745 		if (err != NULL)
746 			goto done;
747 		tmpfds[i] = -1;
748 	}
749 	done = 0;
750 	while (!done) {
751 		int nobj_total, nobj_indexed, nobj_loose, nobj_resolved;
752 
753 		err = got_privsep_recv_index_progress(&done, &nobj_total,
754 		    &nobj_indexed, &nobj_loose, &nobj_resolved,
755 		    &idxibuf);
756 		if (err != NULL)
757 			goto done;
758 		if (nobj_indexed != 0) {
759 			err = progress_cb(progress_arg, NULL,
760 			    packfile_size, nobj_total,
761 			    nobj_indexed, nobj_loose, nobj_resolved);
762 			if (err)
763 				break;
764 		}
765 		imsg_clear(&idxibuf);
766 	}
767 	if (close(imsg_idxfds[0]) == -1) {
768 		err = got_error_from_errno("close");
769 		goto done;
770 	}
771 	if (waitpid(idxpid, &idxstatus, 0) == -1) {
772 		err = got_error_from_errno("waitpid");
773 		goto done;
774 	}
775 
776 	err = got_object_id_str(&id_str, *pack_hash);
777 	if (err)
778 		goto done;
779 	if (asprintf(&packpath, "%s/%s/pack-%s.pack",
780 	    repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
781 		err = got_error_from_errno("asprintf");
782 		goto done;
783 	}
784 
785 	if (asprintf(&idxpath, "%s/%s/pack-%s.idx",
786 	    repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
787 		err = got_error_from_errno("asprintf");
788 		goto done;
789 	}
790 
791 	if (rename(tmppackpath, packpath) == -1) {
792 		err = got_error_from_errno3("rename", tmppackpath, packpath);
793 		goto done;
794 	}
795 	free(tmppackpath);
796 	tmppackpath = NULL;
797 	if (rename(tmpidxpath, idxpath) == -1) {
798 		err = got_error_from_errno3("rename", tmpidxpath, idxpath);
799 		goto done;
800 	}
801 	free(tmpidxpath);
802 	tmpidxpath = NULL;
803 
804 done:
805 	if (tmppackpath && unlink(tmppackpath) == -1 && err == NULL)
806 		err = got_error_from_errno2("unlink", tmppackpath);
807 	if (tmpidxpath && unlink(tmpidxpath) == -1 && err == NULL)
808 		err = got_error_from_errno2("unlink", tmpidxpath);
809 	if (nfetchfd != -1 && close(nfetchfd) == -1 && err == NULL)
810 		err = got_error_from_errno("close");
811 	if (npackfd != -1 && close(npackfd) == -1 && err == NULL)
812 		err = got_error_from_errno("close");
813 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
814 		err = got_error_from_errno("close");
815 	if (idxfd != -1 && close(idxfd) == -1 && err == NULL)
816 		err = got_error_from_errno("close");
817 	for (i = 0; i < nitems(tmpfds); i++) {
818 		if (tmpfds[i] != -1 && close(tmpfds[i]) == -1 && err == NULL)
819 			err = got_error_from_errno("close");
820 	}
821 	free(tmppackpath);
822 	free(tmpidxpath);
823 	free(idxpath);
824 	free(packpath);
825 	free(ref_prefix);
826 	free(progress);
827 
828 	TAILQ_FOREACH(pe, &have_refs, entry) {
829 		free((char *)pe->path);
830 		free(pe->data);
831 	}
832 	got_pathlist_free(&have_refs);
833 	got_ref_list_free(&my_refs);
834 	if (err) {
835 		free(*pack_hash);
836 		*pack_hash = NULL;
837 		TAILQ_FOREACH(pe, refs, entry) {
838 			free((void *)pe->path);
839 			free(pe->data);
840 		}
841 		got_pathlist_free(refs);
842 		TAILQ_FOREACH(pe, symrefs, entry) {
843 			free((void *)pe->path);
844 			free(pe->data);
845 		}
846 		got_pathlist_free(symrefs);
847 	}
848 	return err;
849 }