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 	got_path_strip_trailing_slashes(*server_path);
316 
317 	p = strrchr(p, '/');
318 	if (!p || strlen(p) <= 1) {
319 		err = got_error(GOT_ERR_PARSE_URI);
320 		goto done;
321 	}
322 	p++;
323 	n = strlen(p);
324 	if (n == 0) {
325 		err = got_error(GOT_ERR_PARSE_URI);
326 		goto done;
327 	}
328 	if (hassuffix(p, ".git"))
329 		n -= 4;
330 	*repo_name = strndup(p, (p + n) - p);
331 	if (*repo_name == NULL) {
332 		err = got_error_from_errno("strndup");
333 		goto done;
334 	}
335 done:
336 	if (err) {
337 		free(*proto);
338 		*proto = NULL;
339 		free(*host);
340 		*host = NULL;
341 		free(*port);
342 		*port = NULL;
343 		free(*server_path);
344 		*server_path = NULL;
345 		free(*repo_name);
346 		*repo_name = NULL;
347 	}
348 	return err;
349 }
350 
351 const struct got_error*
352 got_fetch_pack(struct got_object_id **pack_hash, struct got_pathlist_head *refs,
353     struct got_pathlist_head *symrefs, const char *remote_name,
354     int mirror_references, int fetch_all_branches,
355     struct got_pathlist_head *wanted_branches,
356     struct got_pathlist_head *wanted_refs, int list_refs_only, int verbosity,
357     int fetchfd, struct got_repository *repo,
358     got_fetch_progress_cb progress_cb, void *progress_arg)
359 {
360 	int imsg_fetchfds[2], imsg_idxfds[2];
361 	int packfd = -1, npackfd = -1, idxfd = -1, nidxfd = -1, nfetchfd = -1;
362 	int tmpfds[3], i;
363 	int fetchstatus, idxstatus, done = 0;
364 	const struct got_error *err;
365 	struct imsgbuf fetchibuf, idxibuf;
366 	pid_t fetchpid, idxpid;
367 	char *tmppackpath = NULL, *tmpidxpath = NULL;
368 	char *packpath = NULL, *idxpath = NULL, *id_str = NULL;
369 	const char *repo_path = NULL;
370 	struct got_pathlist_head have_refs;
371 	struct got_pathlist_entry *pe;
372 	struct got_reflist_head my_refs;
373 	struct got_reflist_entry *re;
374 	off_t packfile_size = 0;
375 	struct got_packfile_hdr pack_hdr;
376 	uint32_t nobj = 0;
377 	char *ref_prefix = NULL;
378 	size_t ref_prefixlen = 0;
379 	char *path;
380 	char *progress = NULL;
381 
382 	*pack_hash = NULL;
383 
384 	/*
385 	 * Prevent fetching of references that won't make any
386 	 * sense outside of the remote repository's context.
387 	 */
388 	TAILQ_FOREACH(pe, wanted_refs, entry) {
389 		const char *refname = pe->path;
390 		if (strncmp(refname, "refs/got/", 9) == 0 ||
391 		    strncmp(refname, "got/", 4) == 0 ||
392 		    strncmp(refname, "refs/remotes/", 13) == 0 ||
393 		    strncmp(refname, "remotes/", 8) == 0)
394 			return got_error_path(refname, GOT_ERR_FETCH_BAD_REF);
395 	}
396 
397 	if (!list_refs_only)
398 		repo_path = got_repo_get_path_git_dir(repo);
399 
400 	for (i = 0; i < nitems(tmpfds); i++)
401 		tmpfds[i] = -1;
402 
403 	TAILQ_INIT(&have_refs);
404 	SIMPLEQ_INIT(&my_refs);
405 
406 	if (!mirror_references) {
407 		if (asprintf(&ref_prefix, "refs/remotes/%s/",
408 		    remote_name) == -1)
409 			return got_error_from_errno("asprintf");
410 		ref_prefixlen = strlen(ref_prefix);
411 	}
412 
413 	if (!list_refs_only) {
414 		err = got_ref_list(&my_refs, repo, NULL,
415 		    got_ref_cmp_by_name, NULL);
416 		if (err)
417 			goto done;
418 	}
419 
420 	SIMPLEQ_FOREACH(re, &my_refs, entry) {
421 		struct got_object_id *id;
422 		const char *refname;
423 
424 		if (got_ref_is_symbolic(re->ref))
425 			continue;
426 
427 		refname = got_ref_get_name(re->ref);
428 
429 		if (mirror_references) {
430 			char *name;
431 			err = got_ref_resolve(&id, repo, re->ref);
432 			if (err)
433 				goto done;
434 			name = strdup(refname);
435 			if (name == NULL) {
436 				err = got_error_from_errno("strdup");
437 				goto done;
438 			}
439 			err = got_pathlist_append(&have_refs, name, id);
440 			if (err)
441 				goto done;
442 			continue;
443 		}
444 
445 		if (strncmp("refs/tags/", refname, 10) == 0) {
446 			char *tagname;
447 
448 			err = got_ref_resolve(&id, repo, re->ref);
449 			if (err)
450 				goto done;
451 			tagname = strdup(refname);
452 			if (tagname == NULL) {
453 				err = got_error_from_errno("strdup");
454 				goto done;
455 			}
456 			err = got_pathlist_append(&have_refs, tagname, id);
457 			if (err) {
458 				free(tagname);
459 				goto done;
460 			}
461 		}
462 
463 		if (strncmp(ref_prefix, refname, ref_prefixlen) == 0) {
464 			char *branchname;
465 
466 			err = got_ref_resolve(&id, repo, re->ref);
467 			if (err)
468 				goto done;
469 
470 			if (asprintf(&branchname, "refs/heads/%s",
471 			    refname + ref_prefixlen) == -1) {
472 				err = got_error_from_errno("asprintf");
473 				goto done;
474 			}
475 			err = got_pathlist_append(&have_refs, branchname, id);
476 			if (err) {
477 				free(branchname);
478 				goto done;
479 			}
480 		}
481 	}
482 
483 	if (list_refs_only) {
484 		packfd = got_opentempfd();
485 		if (packfd == -1) {
486 			err = got_error_from_errno("got_opentempfd");
487 			goto done;
488 		}
489 	} else {
490 		if (asprintf(&path, "%s/%s/fetching.pack",
491 		    repo_path, GOT_OBJECTS_PACK_DIR) == -1) {
492 			err = got_error_from_errno("asprintf");
493 			goto done;
494 		}
495 		err = got_opentemp_named_fd(&tmppackpath, &packfd, path);
496 		free(path);
497 		if (err)
498 			goto done;
499 	}
500 	if (list_refs_only) {
501 		idxfd = got_opentempfd();
502 		if (idxfd == -1) {
503 			err = got_error_from_errno("got_opentempfd");
504 			goto done;
505 		}
506 	} else {
507 		if (asprintf(&path, "%s/%s/fetching.idx",
508 		    repo_path, GOT_OBJECTS_PACK_DIR) == -1) {
509 			err = got_error_from_errno("asprintf");
510 			goto done;
511 		}
512 		err = got_opentemp_named_fd(&tmpidxpath, &idxfd, path);
513 		free(path);
514 		if (err)
515 			goto done;
516 	}
517 	nidxfd = dup(idxfd);
518 	if (nidxfd == -1) {
519 		err = got_error_from_errno("dup");
520 		goto done;
521 	}
522 
523 	for (i = 0; i < nitems(tmpfds); i++) {
524 		tmpfds[i] = got_opentempfd();
525 		if (tmpfds[i] == -1) {
526 			err = got_error_from_errno("got_opentempfd");
527 			goto done;
528 		}
529 	}
530 
531 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fetchfds) == -1) {
532 		err = got_error_from_errno("socketpair");
533 		goto done;
534 	}
535 
536 	fetchpid = fork();
537 	if (fetchpid == -1) {
538 		err = got_error_from_errno("fork");
539 		goto done;
540 	} else if (fetchpid == 0){
541 		got_privsep_exec_child(imsg_fetchfds,
542 		    GOT_PATH_PROG_FETCH_PACK, tmppackpath);
543 	}
544 
545 	if (close(imsg_fetchfds[1]) != 0) {
546 		err = got_error_from_errno("close");
547 		goto done;
548 	}
549 	imsg_init(&fetchibuf, imsg_fetchfds[0]);
550 	nfetchfd = dup(fetchfd);
551 	if (nfetchfd == -1) {
552 		err = got_error_from_errno("dup");
553 		goto done;
554 	}
555 	err = got_privsep_send_fetch_req(&fetchibuf, nfetchfd, &have_refs,
556 	    fetch_all_branches, wanted_branches, wanted_refs,
557 	    list_refs_only, verbosity);
558 	if (err != NULL)
559 		goto done;
560 	nfetchfd = -1;
561 	npackfd = dup(packfd);
562 	if (npackfd == -1) {
563 		err = got_error_from_errno("dup");
564 		goto done;
565 	}
566 	err = got_privsep_send_fetch_outfd(&fetchibuf, npackfd);
567 	if (err != NULL)
568 		goto done;
569 	npackfd = -1;
570 
571 	packfile_size = 0;
572 	progress = calloc(GOT_FETCH_PKTMAX, 1);
573 	if (progress == NULL) {
574 		err = got_error_from_errno("calloc");
575 		goto done;
576 	}
577 
578 	*pack_hash = calloc(1, sizeof(**pack_hash));
579 	if (*pack_hash == NULL) {
580 		err = got_error_from_errno("calloc");
581 		goto done;
582 	}
583 
584 	while (!done) {
585 		struct got_object_id *id = NULL;
586 		char *refname = NULL;
587 		char *server_progress = NULL;
588 		off_t packfile_size_cur = 0;
589 
590 		err = got_privsep_recv_fetch_progress(&done,
591 		    &id, &refname, symrefs, &server_progress,
592 		    &packfile_size_cur, (*pack_hash)->sha1, &fetchibuf);
593 		if (err != NULL)
594 			goto done;
595 		if (!done && refname && id) {
596 			err = got_pathlist_insert(NULL, refs, refname, id);
597 			if (err)
598 				goto done;
599 		} else if (!done && server_progress) {
600 			char *p;
601 			/*
602 			 * XXX git-daemon tends to send batched output with
603 			 * lines spanning separate packets. Buffer progress
604 			 * output until we see a CR or LF to avoid giving
605 			 * partial lines of progress output to the callback.
606 			 */
607 			if (strlcat(progress, server_progress,
608 			    GOT_FETCH_PKTMAX) >= GOT_FETCH_PKTMAX) {
609 				progress[0] = '\0'; /* discard */
610 				continue;
611 			}
612 			while ((p = strchr(progress, '\r')) != NULL ||
613 			    (p = strchr(progress, '\n')) != NULL) {
614 				char *s;
615 				size_t n;
616 				char c = *p;
617 				*p = '\0';
618 				if (asprintf(&s, "%s%s", progress,
619 				    c == '\n' ? "\n" : "") == -1) {
620 					err = got_error_from_errno("asprintf");
621 					goto done;
622 				}
623 				err = progress_cb(progress_arg, s,
624 				    packfile_size_cur, 0, 0, 0, 0);
625 				free(s);
626 				if (err)
627 					break;
628 				n = strlen(progress);
629 				if (n < GOT_FETCH_PKTMAX - 1) {
630 					memmove(progress, &progress[n + 1],
631 					    GOT_FETCH_PKTMAX - n - 1);
632 				} else
633 					progress[0] = '\0';
634 			}
635 			free(server_progress);
636 			if (err)
637 				goto done;
638 		} else if (!done && packfile_size_cur != packfile_size) {
639 			err = progress_cb(progress_arg, NULL,
640 			    packfile_size_cur, 0, 0, 0, 0);
641 			if (err)
642 				break;
643 			packfile_size = packfile_size_cur;
644 		}
645 	}
646 	if (waitpid(fetchpid, &fetchstatus, 0) == -1) {
647 		err = got_error_from_errno("waitpid");
648 		goto done;
649 	}
650 
651 	if (lseek(packfd, 0, SEEK_SET) == -1) {
652 		err = got_error_from_errno("lseek");
653 		goto done;
654 	}
655 
656 	/* If zero data was fetched without error we are already up-to-date. */
657 	if (packfile_size == 0) {
658 		free(*pack_hash);
659 		*pack_hash = NULL;
660 		goto done;
661 	} else if (packfile_size < sizeof(pack_hdr) + SHA1_DIGEST_LENGTH) {
662 		err = got_error_msg(GOT_ERR_BAD_PACKFILE, "short pack file");
663 		goto done;
664 	} else {
665 		ssize_t n;
666 
667 		n = read(packfd, &pack_hdr, sizeof(pack_hdr));
668 		if (n == -1) {
669 			err = got_error_from_errno("read");
670 			goto done;
671 		}
672 		if (n != sizeof(pack_hdr)) {
673 			err = got_error(GOT_ERR_IO);
674 			goto done;
675 		}
676 		if (pack_hdr.signature != htobe32(GOT_PACKFILE_SIGNATURE)) {
677 			err = got_error_msg(GOT_ERR_BAD_PACKFILE,
678 			    "bad pack file signature");
679 			goto done;
680 		}
681 		if (pack_hdr.version != htobe32(GOT_PACKFILE_VERSION)) {
682 			err = got_error_msg(GOT_ERR_BAD_PACKFILE,
683 			    "bad pack file version");
684 			goto done;
685 		}
686 		nobj = be32toh(pack_hdr.nobjects);
687 		if (nobj == 0 &&
688 		    packfile_size > sizeof(pack_hdr) + SHA1_DIGEST_LENGTH)
689 			return got_error_msg(GOT_ERR_BAD_PACKFILE,
690 			    "bad pack file with zero objects");
691 		if (nobj != 0 &&
692 		    packfile_size <= sizeof(pack_hdr) + SHA1_DIGEST_LENGTH)
693 			return got_error_msg(GOT_ERR_BAD_PACKFILE,
694 			    "empty pack file with non-zero object count");
695 	}
696 
697 	/*
698 	 * If the pack file contains no objects, we may only need to update
699 	 * references in our repository. The caller will take care of that.
700 	 */
701 	if (nobj == 0)
702 		goto done;
703 
704 	if (lseek(packfd, 0, SEEK_SET) == -1) {
705 		err = got_error_from_errno("lseek");
706 		goto done;
707 	}
708  
709 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_idxfds) == -1) {
710 		err = got_error_from_errno("socketpair");
711 		goto done;
712 	}
713 	idxpid = fork();
714 	if (idxpid == -1) {
715 		err= got_error_from_errno("fork");
716 		goto done;
717 	} else if (idxpid == 0)
718 		got_privsep_exec_child(imsg_idxfds,
719 		    GOT_PATH_PROG_INDEX_PACK, tmppackpath);
720 	if (close(imsg_idxfds[1]) != 0) {
721 		err = got_error_from_errno("close");
722 		goto done;
723 	}
724 	imsg_init(&idxibuf, imsg_idxfds[0]);
725 
726 	npackfd = dup(packfd);
727 	if (npackfd == -1) {
728 		err = got_error_from_errno("dup");
729 		goto done;
730 	}
731 	err = got_privsep_send_index_pack_req(&idxibuf, (*pack_hash)->sha1,
732 	    npackfd);
733 	if (err != NULL)
734 		goto done;
735 	npackfd = -1;
736 	err = got_privsep_send_index_pack_outfd(&idxibuf, nidxfd);
737 	if (err != NULL)
738 		goto done;
739 	nidxfd = -1;
740 	for (i = 0; i < nitems(tmpfds); i++) {
741 		err = got_privsep_send_tmpfd(&idxibuf, tmpfds[i]);
742 		if (err != NULL)
743 			goto done;
744 		tmpfds[i] = -1;
745 	}
746 	done = 0;
747 	while (!done) {
748 		int nobj_total, nobj_indexed, nobj_loose, nobj_resolved;
749 
750 		err = got_privsep_recv_index_progress(&done, &nobj_total,
751 		    &nobj_indexed, &nobj_loose, &nobj_resolved,
752 		    &idxibuf);
753 		if (err != NULL)
754 			goto done;
755 		if (nobj_indexed != 0) {
756 			err = progress_cb(progress_arg, NULL,
757 			    packfile_size, nobj_total,
758 			    nobj_indexed, nobj_loose, nobj_resolved);
759 			if (err)
760 				break;
761 		}
762 		imsg_clear(&idxibuf);
763 	}
764 	if (close(imsg_idxfds[0]) == -1) {
765 		err = got_error_from_errno("close");
766 		goto done;
767 	}
768 	if (waitpid(idxpid, &idxstatus, 0) == -1) {
769 		err = got_error_from_errno("waitpid");
770 		goto done;
771 	}
772 
773 	err = got_object_id_str(&id_str, *pack_hash);
774 	if (err)
775 		goto done;
776 	if (asprintf(&packpath, "%s/%s/pack-%s.pack",
777 	    repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
778 		err = got_error_from_errno("asprintf");
779 		goto done;
780 	}
781 
782 	if (asprintf(&idxpath, "%s/%s/pack-%s.idx",
783 	    repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
784 		err = got_error_from_errno("asprintf");
785 		goto done;
786 	}
787 
788 	if (rename(tmppackpath, packpath) == -1) {
789 		err = got_error_from_errno3("rename", tmppackpath, packpath);
790 		goto done;
791 	}
792 	free(tmppackpath);
793 	tmppackpath = NULL;
794 	if (rename(tmpidxpath, idxpath) == -1) {
795 		err = got_error_from_errno3("rename", tmpidxpath, idxpath);
796 		goto done;
797 	}
798 	free(tmpidxpath);
799 	tmpidxpath = NULL;
800 
801 done:
802 	if (tmppackpath && unlink(tmppackpath) == -1 && err == NULL)
803 		err = got_error_from_errno2("unlink", tmppackpath);
804 	if (tmpidxpath && unlink(tmpidxpath) == -1 && err == NULL)
805 		err = got_error_from_errno2("unlink", tmpidxpath);
806 	if (nfetchfd != -1 && close(nfetchfd) == -1 && err == NULL)
807 		err = got_error_from_errno("close");
808 	if (npackfd != -1 && close(npackfd) == -1 && err == NULL)
809 		err = got_error_from_errno("close");
810 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
811 		err = got_error_from_errno("close");
812 	if (idxfd != -1 && close(idxfd) == -1 && err == NULL)
813 		err = got_error_from_errno("close");
814 	for (i = 0; i < nitems(tmpfds); i++) {
815 		if (tmpfds[i] != -1 && close(tmpfds[i]) == -1 && err == NULL)
816 			err = got_error_from_errno("close");
817 	}
818 	free(tmppackpath);
819 	free(tmpidxpath);
820 	free(idxpath);
821 	free(packpath);
822 	free(ref_prefix);
823 	free(progress);
824 
825 	TAILQ_FOREACH(pe, &have_refs, entry) {
826 		free((char *)pe->path);
827 		free(pe->data);
828 	}
829 	got_pathlist_free(&have_refs);
830 	got_ref_list_free(&my_refs);
831 	if (err) {
832 		free(*pack_hash);
833 		*pack_hash = NULL;
834 		TAILQ_FOREACH(pe, refs, entry) {
835 			free((void *)pe->path);
836 			free(pe->data);
837 		}
838 		got_pathlist_free(refs);
839 		TAILQ_FOREACH(pe, symrefs, entry) {
840 			free((void *)pe->path);
841 			free(pe->data);
842 		}
843 		got_pathlist_free(symrefs);
844 	}
845 	return err;
846 }