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