1 /*
2  * Copyright (c) 2020 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/types.h>
20 #include <sys/queue.h>
21 #include <sys/uio.h>
22 #include <sys/stat.h>
23 #include <sys/socket.h>
24 #include <sys/wait.h>
25 
26 #include <dirent.h>
27 #include <errno.h>
28 #include <fcntl.h>
29 #include <stdint.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <limits.h>
34 #include <unistd.h>
35 
36 #include "got_error.h"
37 #include "got_cancel.h"
38 #include "got_object.h"
39 #include "got_reference.h"
40 #include "got_repository.h"
41 #include "got_repository_admin.h"
42 #include "got_opentemp.h"
43 #include "got_path.h"
44 
45 #include "got_lib_delta.h"
46 #include "got_lib_object.h"
47 #include "got_lib_object_idset.h"
48 #include "got_lib_object_cache.h"
49 #include "got_lib_pack.h"
50 #include "got_lib_privsep.h"
51 #include "got_lib_repository.h"
52 #include "got_lib_ratelimit.h"
53 #include "got_lib_pack_create.h"
54 #include "got_lib_hash.h"
55 #include "got_lib_lockfile.h"
56 
57 #ifndef nitems
58 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
59 #endif
60 
61 static const struct got_error *
62 get_reflist_object_ids(struct got_object_id ***ids, int *nobjects,
63     unsigned int wanted_obj_type_mask, struct got_reflist_head *refs,
64     struct got_repository *repo,
65     got_cancel_cb cancel_cb, void *cancel_arg)
66 {
67 	const struct got_error *err = NULL;
68 	const size_t alloc_chunksz = 256;
69 	size_t nalloc;
70 	struct got_reflist_entry *re;
71 	int i;
72 
73 	*ids = NULL;
74 	*nobjects = 0;
75 
76 	err = got_reflist_sort(refs,
77 	    got_ref_cmp_by_commit_timestamp_descending, repo);
78 	if (err)
79 		return err;
80 
81 	*ids = reallocarray(NULL, alloc_chunksz, sizeof(struct got_object_id *));
82 	if (*ids == NULL)
83 		return got_error_from_errno("reallocarray");
84 	nalloc = alloc_chunksz;
85 
86 	TAILQ_FOREACH(re, refs, entry) {
87 		struct got_object_id *id;
88 
89 		if (cancel_cb) {
90 			err = cancel_cb(cancel_arg);
91 			if (err)
92 				goto done;
93 		}
94 
95 		err = got_ref_resolve(&id, repo, re->ref);
96 		if (err)
97 			goto done;
98 
99 		if (wanted_obj_type_mask != GOT_OBJ_TYPE_ANY) {
100 			int obj_type;
101 			err = got_object_get_type(&obj_type, repo, id);
102 			if (err)
103 				goto done;
104 			if ((wanted_obj_type_mask & (1 << obj_type)) == 0) {
105 				free(id);
106 				id = NULL;
107 				continue;
108 			}
109 		}
110 
111 		if (nalloc <= *nobjects) {
112 			struct got_object_id **new;
113 			new = recallocarray(*ids, nalloc,
114 			    nalloc + alloc_chunksz,
115 			    sizeof(struct got_object_id *));
116 			if (new == NULL) {
117 				err = got_error_from_errno(
118 				    "recallocarray");
119 				goto done;
120 			}
121 			*ids = new;
122 			nalloc += alloc_chunksz;
123 		}
124 		(*ids)[*nobjects] = id;
125 		if ((*ids)[*nobjects] == NULL) {
126 			err = got_error_from_errno("got_object_id_dup");
127 			goto done;
128 		}
129 		(*nobjects)++;
130 	}
131 done:
132 	if (err) {
133 		for (i = 0; i < *nobjects; i++)
134 			free((*ids)[i]);
135 		free(*ids);
136 		*ids = NULL;
137 		*nobjects = 0;
138 	}
139 	return err;
140 }
141 
142 const struct got_error *
143 got_repo_pack_objects(FILE **packfile, struct got_object_id **pack_hash,
144     struct got_reflist_head *include_refs,
145     struct got_reflist_head *exclude_refs, struct got_repository *repo,
146     int loose_obj_only, int force_refdelta,
147     got_pack_progress_cb progress_cb, void *progress_arg,
148     got_cancel_cb cancel_cb, void *cancel_arg)
149 {
150 	const struct got_error *err = NULL;
151 	struct got_object_id **ours = NULL, **theirs = NULL;
152 	int nours = 0, ntheirs = 0, packfd = -1, i;
153 	char *tmpfile_path = NULL, *path = NULL, *packfile_path = NULL;
154 	char *sha1_str = NULL;
155 	FILE *delta_cache = NULL;
156 	struct got_ratelimit rl;
157 
158 	*packfile = NULL;
159 	*pack_hash = NULL;
160 
161 	got_ratelimit_init(&rl, 0, 500);
162 
163 	if (asprintf(&path, "%s/%s/packing.pack",
164 	    got_repo_get_path_git_dir(repo), GOT_OBJECTS_PACK_DIR) == -1) {
165 		err = got_error_from_errno("asprintf");
166 		goto done;
167 	}
168 	err = got_opentemp_named_fd(&tmpfile_path, &packfd, path, "");
169 	if (err)
170 		goto done;
171 
172 	if (fchmod(packfd, GOT_DEFAULT_PACK_MODE) == -1) {
173 		err = got_error_from_errno2("fchmod", tmpfile_path);
174 		goto done;
175 	}
176 
177 	delta_cache = got_opentemp();
178 	if (delta_cache == NULL) {
179 		err = got_error_from_errno("got_opentemp");
180 		goto done;
181 	}
182 
183 	err = get_reflist_object_ids(&ours, &nours,
184 	    (1 << GOT_OBJ_TYPE_COMMIT) | (1 << GOT_OBJ_TYPE_TAG),
185 	    include_refs, repo, cancel_cb, cancel_arg);
186 	if (err)
187 		goto done;
188 
189 	if (nours == 0) {
190 		err = got_error(GOT_ERR_CANNOT_PACK);
191 		goto done;
192 	}
193 
194 	if (!TAILQ_EMPTY(exclude_refs)) {
195 		err = get_reflist_object_ids(&theirs, &ntheirs,
196 		    (1 << GOT_OBJ_TYPE_COMMIT) | (1 << GOT_OBJ_TYPE_TAG),
197 		    exclude_refs, repo,
198 		    cancel_cb, cancel_arg);
199 		if (err)
200 			goto done;
201 	}
202 
203 	*pack_hash = calloc(1, sizeof(**pack_hash));
204 	if (*pack_hash == NULL) {
205 		err = got_error_from_errno("calloc");
206 		goto done;
207 	}
208 
209 	err = got_pack_create((*pack_hash)->sha1, packfd, delta_cache,
210 	    theirs, ntheirs, ours, nours, repo, loose_obj_only,
211 	    0, force_refdelta, progress_cb, progress_arg, &rl,
212 	    cancel_cb, cancel_arg);
213 	if (err)
214 		goto done;
215 
216 	err = got_object_id_str(&sha1_str, *pack_hash);
217 	if (err)
218 		goto done;
219 	if (asprintf(&packfile_path, "%s/%s/pack-%s.pack",
220 	    got_repo_get_path_git_dir(repo), GOT_OBJECTS_PACK_DIR,
221 	    sha1_str) == -1) {
222 		err = got_error_from_errno("asprintf");
223 		goto done;
224 	}
225 
226 	if (lseek(packfd, 0L, SEEK_SET) == -1) {
227 		err = got_error_from_errno("lseek");
228 		goto done;
229 	}
230 	if (rename(tmpfile_path, packfile_path) == -1) {
231 		err = got_error_from_errno3("rename", tmpfile_path,
232 		    packfile_path);
233 		goto done;
234 	}
235 	free(tmpfile_path);
236 	tmpfile_path = NULL;
237 
238 	*packfile = fdopen(packfd, "w");
239 	if (*packfile == NULL) {
240 		err = got_error_from_errno2("fdopen", tmpfile_path);
241 		goto done;
242 	}
243 	packfd = -1;
244 done:
245 	for (i = 0; i < nours; i++)
246 		free(ours[i]);
247 	free(ours);
248 	for (i = 0; i < ntheirs; i++)
249 		free(theirs[i]);
250 	free(theirs);
251 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
252 		err = got_error_from_errno2("close", packfile_path);
253 	if (delta_cache && fclose(delta_cache) == EOF && err == NULL)
254 		err = got_error_from_errno("fclose");
255 	if (tmpfile_path && unlink(tmpfile_path) == -1 && err == NULL)
256 		err = got_error_from_errno2("unlink", tmpfile_path);
257 	free(tmpfile_path);
258 	free(packfile_path);
259 	free(sha1_str);
260 	free(path);
261 	if (err) {
262 		free(*pack_hash);
263 		*pack_hash = NULL;
264 		if (*packfile)
265 			fclose(*packfile);
266 		*packfile = NULL;
267 	}
268 	return err;
269 }
270 
271 const struct got_error *
272 got_repo_index_pack(FILE *packfile, struct got_object_id *pack_hash,
273     struct got_repository *repo,
274     got_pack_index_progress_cb progress_cb, void *progress_arg,
275     got_cancel_cb cancel_cb, void *cancel_arg)
276 {
277 	size_t i;
278 	char *path;
279 	int imsg_idxfds[2];
280 	int npackfd = -1, idxfd = -1, nidxfd = -1;
281 	int tmpfds[3];
282 	int idxstatus, done = 0;
283 	const struct got_error *err;
284 	struct imsgbuf idxibuf;
285 	pid_t idxpid;
286 	char *tmpidxpath = NULL;
287 	char *packfile_path = NULL, *idxpath = NULL, *id_str = NULL;
288 	const char *repo_path = got_repo_get_path_git_dir(repo);
289 	struct stat sb;
290 
291 	for (i = 0; i < nitems(tmpfds); i++)
292 		tmpfds[i] = -1;
293 
294 	if (asprintf(&path, "%s/%s/indexing.idx",
295 	    repo_path, GOT_OBJECTS_PACK_DIR) == -1) {
296 		err = got_error_from_errno("asprintf");
297 		goto done;
298 	}
299 	err = got_opentemp_named_fd(&tmpidxpath, &idxfd, path, "");
300 	free(path);
301 	if (err)
302 		goto done;
303 	if (fchmod(idxfd, GOT_DEFAULT_PACK_MODE) == -1) {
304 		err = got_error_from_errno2("fchmod", tmpidxpath);
305 		goto done;
306 	}
307 
308 	nidxfd = dup(idxfd);
309 	if (nidxfd == -1) {
310 		err = got_error_from_errno("dup");
311 		goto done;
312 	}
313 
314 	for (i = 0; i < nitems(tmpfds); i++) {
315 		tmpfds[i] = got_opentempfd();
316 		if (tmpfds[i] == -1) {
317 			err = got_error_from_errno("got_opentempfd");
318 			goto done;
319 		}
320 	}
321 
322 	err = got_object_id_str(&id_str, pack_hash);
323 	if (err)
324 		goto done;
325 
326 	if (asprintf(&packfile_path, "%s/%s/pack-%s.pack",
327 	    repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
328 		err = got_error_from_errno("asprintf");
329 		goto done;
330 	}
331 
332 	if (fstat(fileno(packfile), &sb) == -1) {
333 		err = got_error_from_errno2("fstat", packfile_path);
334 		goto done;
335 	}
336 
337 	if (asprintf(&idxpath, "%s/%s/pack-%s.idx",
338 	    repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
339 		err = got_error_from_errno("asprintf");
340 		goto done;
341 	}
342 
343 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_idxfds) == -1) {
344 		err = got_error_from_errno("socketpair");
345 		goto done;
346 	}
347 	idxpid = fork();
348 	if (idxpid == -1) {
349 		err= got_error_from_errno("fork");
350 		goto done;
351 	} else if (idxpid == 0)
352 		got_privsep_exec_child(imsg_idxfds,
353 		    GOT_PATH_PROG_INDEX_PACK, packfile_path);
354 	if (close(imsg_idxfds[1]) == -1) {
355 		err = got_error_from_errno("close");
356 		goto done;
357 	}
358 	imsg_init(&idxibuf, imsg_idxfds[0]);
359 
360 	npackfd = dup(fileno(packfile));
361 	if (npackfd == -1) {
362 		err = got_error_from_errno("dup");
363 		goto done;
364 	}
365 	err = got_privsep_send_index_pack_req(&idxibuf, pack_hash->sha1,
366 	    npackfd);
367 	if (err != NULL)
368 		goto done;
369 	npackfd = -1;
370 	err = got_privsep_send_index_pack_outfd(&idxibuf, nidxfd);
371 	if (err != NULL)
372 		goto done;
373 	nidxfd = -1;
374 	for (i = 0; i < nitems(tmpfds); i++) {
375 		err = got_privsep_send_tmpfd(&idxibuf, tmpfds[i]);
376 		if (err != NULL)
377 			goto done;
378 		tmpfds[i] = -1;
379 	}
380 	done = 0;
381 	while (!done) {
382 		int nobj_total, nobj_indexed, nobj_loose, nobj_resolved;
383 
384 		if (cancel_cb) {
385 			err = cancel_cb(cancel_arg);
386 			if (err)
387 				goto done;
388 		}
389 
390 		err = got_privsep_recv_index_progress(&done, &nobj_total,
391 		    &nobj_indexed, &nobj_loose, &nobj_resolved,
392 		    &idxibuf);
393 		if (err != NULL)
394 			goto done;
395 		if (nobj_indexed != 0) {
396 			err = progress_cb(progress_arg, sb.st_size,
397 			    nobj_total, nobj_indexed, nobj_loose,
398 			    nobj_resolved);
399 			if (err)
400 				break;
401 		}
402 	}
403 	if (close(imsg_idxfds[0]) == -1) {
404 		err = got_error_from_errno("close");
405 		goto done;
406 	}
407 	if (waitpid(idxpid, &idxstatus, 0) == -1) {
408 		err = got_error_from_errno("waitpid");
409 		goto done;
410 	}
411 
412 	if (rename(tmpidxpath, idxpath) == -1) {
413 		err = got_error_from_errno3("rename", tmpidxpath, idxpath);
414 		goto done;
415 	}
416 	free(tmpidxpath);
417 	tmpidxpath = NULL;
418 
419 done:
420 	if (tmpidxpath && unlink(tmpidxpath) == -1 && err == NULL)
421 		err = got_error_from_errno2("unlink", tmpidxpath);
422 	if (npackfd != -1 && close(npackfd) == -1 && err == NULL)
423 		err = got_error_from_errno("close");
424 	if (idxfd != -1 && close(idxfd) == -1 && err == NULL)
425 		err = got_error_from_errno("close");
426 	for (i = 0; i < nitems(tmpfds); i++) {
427 		if (tmpfds[i] != -1 && close(tmpfds[i]) == -1 && err == NULL)
428 			err = got_error_from_errno("close");
429 	}
430 	free(tmpidxpath);
431 	free(idxpath);
432 	free(packfile_path);
433 	return err;
434 }
435 
436 const struct got_error *
437 got_repo_find_pack(FILE **packfile, struct got_object_id **pack_hash,
438     struct got_repository *repo, const char *packfile_path)
439 {
440 	const struct got_error *err = NULL;
441 	const char *packdir_path = NULL;
442 	char *packfile_name = NULL, *p, *dot;
443 	struct got_object_id id;
444 	int packfd = -1;
445 
446 	*packfile = NULL;
447 	*pack_hash = NULL;
448 
449 	packdir_path = got_repo_get_path_objects_pack(repo);
450 	if (packdir_path == NULL)
451 		return got_error_from_errno("got_repo_get_path_objects_pack");
452 
453 	if (!got_path_is_child(packfile_path, packdir_path,
454 	    strlen(packdir_path))) {
455 		err = got_error_path(packfile_path, GOT_ERR_BAD_PATH);
456 		goto done;
457 
458 	}
459 
460 	err = got_path_basename(&packfile_name, packfile_path);
461 	if (err)
462 		goto done;
463 	p = packfile_name;
464 
465 	if (strncmp(p, "pack-", 5) != 0) {
466 		err = got_error_fmt(GOT_ERR_BAD_PATH,
467 		    "'%s' is not a valid pack file name",
468 		    packfile_name);
469 		goto done;
470 	}
471 	p += 5;
472 	dot = strchr(p, '.');
473 	if (dot == NULL) {
474 		err = got_error_fmt(GOT_ERR_BAD_PATH,
475 		    "'%s' is not a valid pack file name",
476 		    packfile_name);
477 		goto done;
478 	}
479 	if (strcmp(dot + 1, "pack") != 0) {
480 		err = got_error_fmt(GOT_ERR_BAD_PATH,
481 		    "'%s' is not a valid pack file name",
482 		    packfile_name);
483 		goto done;
484 	}
485 	*dot = '\0';
486 	if (!got_parse_object_id(&id, p, repo->algo)) {
487 		err = got_error_fmt(GOT_ERR_BAD_PATH,
488 		    "'%s' is not a valid pack file name",
489 		    packfile_name);
490 		goto done;
491 	}
492 
493 	*pack_hash = got_object_id_dup(&id);
494 	if (*pack_hash == NULL) {
495 		err = got_error_from_errno("got_object_id_dup");
496 		goto done;
497 	}
498 
499 	packfd = open(packfile_path, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
500 	if (packfd == -1) {
501 		err = got_error_from_errno2("open", packfile_path);
502 		goto done;
503 	}
504 
505 	*packfile = fdopen(packfd, "r");
506 	if (*packfile == NULL) {
507 		err = got_error_from_errno2("fdopen", packfile_path);
508 		goto done;
509 	}
510 	packfd = -1;
511 done:
512 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
513 		err = got_error_from_errno2("close", packfile_path);
514 	free(packfile_name);
515 	if (err) {
516 		free(*pack_hash);
517 		*pack_hash = NULL;
518 	}
519 	return err;
520 }
521 
522 const struct got_error *
523 got_repo_list_pack(FILE *packfile, struct got_object_id *pack_hash,
524     struct got_repository *repo, got_pack_list_cb list_cb, void *list_arg,
525     got_cancel_cb cancel_cb, void *cancel_arg)
526 {
527 	const struct got_error *err = NULL;
528 	char *id_str = NULL, *idxpath = NULL, *packpath = NULL;
529 	struct got_packidx *packidx = NULL;
530 	struct got_pack *pack = NULL;
531 	uint32_t nobj, i;
532 
533 	err = got_object_id_str(&id_str, pack_hash);
534 	if (err)
535 		goto done;
536 
537 	if (asprintf(&packpath, "%s/pack-%s.pack",
538 	    GOT_OBJECTS_PACK_DIR, id_str) == -1) {
539 		err = got_error_from_errno("asprintf");
540 		goto done;
541 	}
542 	if (asprintf(&idxpath, "%s/pack-%s.idx",
543 	    GOT_OBJECTS_PACK_DIR, id_str) == -1) {
544 		err = got_error_from_errno("asprintf");
545 		goto done;
546 	}
547 
548 	err = got_packidx_open(&packidx, got_repo_get_fd(repo), idxpath, 1);
549 	if (err)
550 		goto done;
551 
552 	err = got_repo_cache_pack(&pack, repo, packpath, packidx);
553 	if (err)
554 		goto done;
555 
556 	nobj = be32toh(packidx->hdr.fanout_table[0xff]);
557 	for (i = 0; i < nobj; i++) {
558 		struct got_packidx_object_id *oid;
559 		struct got_object_id id, base_id;
560 		off_t offset, base_offset = 0;
561 		uint8_t type;
562 		uint64_t size;
563 		size_t tslen, len;
564 
565 		if (cancel_cb) {
566 			err = cancel_cb(cancel_arg);
567 			if (err)
568 				break;
569 		}
570 		oid = &packidx->hdr.sorted_ids[i];
571 		memcpy(id.sha1, oid->sha1, SHA1_DIGEST_LENGTH);
572 
573 		offset = got_packidx_get_object_offset(packidx, i);
574 		if (offset == -1) {
575 			err = got_error(GOT_ERR_BAD_PACKIDX);
576 			goto done;
577 		}
578 
579 		err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
580 		    pack, offset);
581 		if (err)
582 			goto done;
583 
584 		switch (type) {
585 		case GOT_OBJ_TYPE_OFFSET_DELTA:
586 			err = got_pack_parse_offset_delta(&base_offset, &len,
587 			    pack, offset, tslen);
588 			if (err)
589 				goto done;
590 			break;
591 		case GOT_OBJ_TYPE_REF_DELTA:
592 			err = got_pack_parse_ref_delta(&base_id,
593 			    pack, offset, tslen);
594 			if (err)
595 				goto done;
596 			break;
597 		}
598 		err = (*list_cb)(list_arg, &id, type, offset, size,
599 		    base_offset, &base_id);
600 		if (err)
601 			goto done;
602 	}
603 
604 done:
605 	free(id_str);
606 	free(idxpath);
607 	free(packpath);
608 	if (packidx)
609 		got_packidx_close(packidx);
610 	return err;
611 }
612 
613 static const struct got_error *
614 repo_cleanup_lock(struct got_repository *repo, struct got_lockfile **lk)
615 {
616 	const struct got_error *err;
617 	char myname[_POSIX_HOST_NAME_MAX + 1];
618 
619 	if (gethostname(myname, sizeof(myname)) == -1)
620 		return got_error_from_errno("gethostname");
621 
622 	err = got_lockfile_lock(lk, "gc.pid", got_repo_get_fd(repo));
623 	if (err)
624 		return err;
625 
626 	/*
627 	 * Git uses these info to provide some verbiage when finds a
628 	 * lock during `git gc --force' so don't try too hard to avoid
629 	 * short writes and don't care if a race happens between the
630 	 * lockfile creation and the write itself.
631 	 */
632 	if (dprintf((*lk)->fd, "%d %s", getpid(), myname) < 0)
633 		return got_error_from_errno("dprintf");
634 
635 	return NULL;
636 }
637 
638 static const struct got_error *
639 report_cleanup_progress(got_cleanup_progress_cb progress_cb,
640     void *progress_arg, struct got_ratelimit *rl,
641     int ncommits, int nloose, int npurged, int nredundant)
642 {
643 	const struct got_error *err;
644 	int elapsed;
645 
646 	if (progress_cb == NULL)
647 		return NULL;
648 
649 	err = got_ratelimit_check(&elapsed, rl);
650 	if (err || !elapsed)
651 		return err;
652 
653 	return progress_cb(progress_arg, ncommits, nloose, npurged,
654 	    nredundant);
655 }
656 
657 static const struct got_error *
658 get_loose_object_ids(struct got_object_idset **loose_ids,
659     off_t *ondisk_size, int ncommits,
660     got_cleanup_progress_cb progress_cb, void *progress_arg,
661     struct got_ratelimit *rl, struct got_repository *repo)
662 {
663 	const struct got_error *err = NULL;
664 	char *path_objects = NULL, *path = NULL;
665 	DIR *dir = NULL;
666 	struct got_object *obj = NULL;
667 	struct got_object_id id;
668 	int i, fd = -1;
669 	struct stat sb;
670 
671 	*ondisk_size = 0;
672 	*loose_ids = got_object_idset_alloc();
673 	if (*loose_ids == NULL)
674 		return got_error_from_errno("got_object_idset_alloc");
675 
676 	path_objects = got_repo_get_path_objects(repo);
677 	if (path_objects == NULL) {
678 		err = got_error_from_errno("got_repo_get_path_objects");
679 		goto done;
680 	}
681 
682 	for (i = 0; i <= 0xff; i++) {
683 		struct dirent *dent;
684 
685 		if (asprintf(&path, "%s/%.2x", path_objects, i) == -1) {
686 			err = got_error_from_errno("asprintf");
687 			break;
688 		}
689 
690 		dir = opendir(path);
691 		if (dir == NULL) {
692 			if (errno == ENOENT) {
693 				err = NULL;
694 				continue;
695 			}
696 			err = got_error_from_errno2("opendir", path);
697 			break;
698 		}
699 
700 		while ((dent = readdir(dir)) != NULL) {
701 			char *id_str;
702 
703 			if (strcmp(dent->d_name, ".") == 0 ||
704 			    strcmp(dent->d_name, "..") == 0)
705 				continue;
706 
707 			if (asprintf(&id_str, "%.2x%s", i, dent->d_name) == -1) {
708 				err = got_error_from_errno("asprintf");
709 				goto done;
710 			}
711 
712 			if (!got_parse_object_id(&id, id_str, repo->algo)) {
713 				free(id_str);
714 				continue;
715 			}
716 			free(id_str);
717 
718 			err = got_object_open_loose_fd(&fd, &id, repo);
719 			if (err)
720 				goto done;
721 			if (fstat(fd, &sb) == -1) {
722 				err = got_error_from_errno("fstat");
723 				goto done;
724 			}
725 			err = got_object_read_header_privsep(&obj, &id, repo,
726 			    fd);
727 			if (err)
728 				goto done;
729 			fd = -1; /* already closed */
730 
731 			switch (obj->type) {
732 			case GOT_OBJ_TYPE_COMMIT:
733 			case GOT_OBJ_TYPE_TREE:
734 			case GOT_OBJ_TYPE_BLOB:
735 			case GOT_OBJ_TYPE_TAG:
736 				break;
737 			default:
738 				err = got_error_fmt(GOT_ERR_OBJ_TYPE,
739 				    "%d", obj->type);
740 				goto done;
741 			}
742 			got_object_close(obj);
743 			obj = NULL;
744 			(*ondisk_size) += sb.st_size;
745 			err = got_object_idset_add(*loose_ids, &id, NULL);
746 			if (err)
747 				goto done;
748 			err = report_cleanup_progress(progress_cb,
749 			    progress_arg, rl, ncommits,
750 			    got_object_idset_num_elements(*loose_ids),
751 			    -1, -1);
752 			if (err)
753 				goto done;
754 		}
755 
756 		if (closedir(dir) != 0) {
757 			err = got_error_from_errno("closedir");
758 			goto done;
759 		}
760 		dir = NULL;
761 
762 		free(path);
763 		path = NULL;
764 	}
765 done:
766 	if (dir && closedir(dir) != 0 && err == NULL)
767 		err = got_error_from_errno("closedir");
768 	if (fd != -1 && close(fd) == -1 && err == NULL)
769 		err = got_error_from_errno("close");
770 	if (err) {
771 		got_object_idset_free(*loose_ids);
772 		*loose_ids = NULL;
773 	}
774 	if (obj)
775 		got_object_close(obj);
776 	free(path_objects);
777 	free(path);
778 	return err;
779 }
780 
781 static const struct got_error *
782 load_tree_entries(struct got_object_id_queue *ids,
783     struct got_object_idset *traversed_ids, struct got_object_id *tree_id,
784     const char *dpath, struct got_repository *repo,
785     got_cancel_cb cancel_cb, void *cancel_arg)
786 {
787 	const struct got_error *err;
788 	struct got_tree_object *tree;
789 	char *p = NULL;
790 	int i;
791 
792 	err = got_object_open_as_tree(&tree, repo, tree_id);
793 	if (err)
794 		return err;
795 
796 	for (i = 0; i < got_object_tree_get_nentries(tree); i++) {
797 		struct got_tree_entry *e = got_object_tree_get_entry(tree, i);
798 		struct got_object_id *id = got_tree_entry_get_id(e);
799 		mode_t mode = got_tree_entry_get_mode(e);
800 
801 		if (cancel_cb) {
802 			err = (*cancel_cb)(cancel_arg);
803 			if (err)
804 				break;
805 		}
806 
807 		if (got_object_tree_entry_is_symlink(e) ||
808 		    got_object_tree_entry_is_submodule(e) ||
809 		    got_object_idset_contains(traversed_ids, id))
810 			continue;
811 
812 		if (asprintf(&p, "%s%s%s", dpath, dpath[0] != '\0' ? "/" : "",
813 		    got_tree_entry_get_name(e)) == -1) {
814 			err = got_error_from_errno("asprintf");
815 			break;
816 		}
817 
818 		if (S_ISDIR(mode)) {
819 			struct got_object_qid *qid;
820 			err = got_object_qid_alloc(&qid, id);
821 			if (err)
822 				break;
823 			STAILQ_INSERT_TAIL(ids, qid, entry);
824 		} else if (S_ISREG(mode)) {
825 			/* This blob is referenced. */
826 			err = got_object_idset_add(traversed_ids, id, NULL);
827 			if (err)
828 				break;
829 		}
830 		free(p);
831 		p = NULL;
832 	}
833 
834 	got_object_tree_close(tree);
835 	free(p);
836 	return err;
837 }
838 
839 static const struct got_error *
840 load_tree(struct got_object_idset *traversed_ids,
841     struct got_object_id *tree_id,
842     const char *dpath, struct got_repository *repo,
843     got_cancel_cb cancel_cb, void *cancel_arg)
844 {
845 	const struct got_error *err = NULL;
846 	struct got_object_id_queue tree_ids;
847 	struct got_object_qid *qid;
848 
849 	err = got_object_qid_alloc(&qid, tree_id);
850 	if (err)
851 		return err;
852 
853 	STAILQ_INIT(&tree_ids);
854 	STAILQ_INSERT_TAIL(&tree_ids, qid, entry);
855 
856 	while (!STAILQ_EMPTY(&tree_ids)) {
857 		if (cancel_cb) {
858 			err = (*cancel_cb)(cancel_arg);
859 			if (err)
860 				break;
861 		}
862 
863 		qid = STAILQ_FIRST(&tree_ids);
864 		STAILQ_REMOVE_HEAD(&tree_ids, entry);
865 
866 		if (got_object_idset_contains(traversed_ids, &qid->id)) {
867 			got_object_qid_free(qid);
868 			continue;
869 		}
870 
871 		err = got_object_idset_add(traversed_ids, &qid->id, NULL);
872 		if (err) {
873 			got_object_qid_free(qid);
874 			break;
875 		}
876 
877 		err = load_tree_entries(&tree_ids, traversed_ids,
878 		    &qid->id, dpath, repo, cancel_cb, cancel_arg);
879 		got_object_qid_free(qid);
880 		if (err)
881 			break;
882 	}
883 
884 	got_object_id_queue_free(&tree_ids);
885 	return err;
886 }
887 
888 static const struct got_error *
889 load_commit_or_tag(int *ncommits, struct got_object_idset *traversed_ids,
890     struct got_object_id *id, struct got_repository *repo,
891     got_cleanup_progress_cb progress_cb, void *progress_arg,
892     struct got_ratelimit *rl, got_cancel_cb cancel_cb, void *cancel_arg)
893 {
894 	const struct got_error *err;
895 	struct got_commit_object *commit = NULL;
896 	struct got_tag_object *tag = NULL;
897 	struct got_object_id *tree_id = NULL;
898 	struct got_object_id_queue ids;
899 	struct got_object_qid *qid;
900 	int obj_type;
901 
902 	err = got_object_qid_alloc(&qid, id);
903 	if (err)
904 		return err;
905 
906 	STAILQ_INIT(&ids);
907 	STAILQ_INSERT_TAIL(&ids, qid, entry);
908 
909 	while (!STAILQ_EMPTY(&ids)) {
910 		if (cancel_cb) {
911 			err = (*cancel_cb)(cancel_arg);
912 			if (err)
913 				break;
914 		}
915 
916 		qid = STAILQ_FIRST(&ids);
917 		STAILQ_REMOVE_HEAD(&ids, entry);
918 
919 		if (got_object_idset_contains(traversed_ids, &qid->id)) {
920 			got_object_qid_free(qid);
921 			qid = NULL;
922 			continue;
923 		}
924 
925 		err = got_object_idset_add(traversed_ids, &qid->id, NULL);
926 		if (err)
927 			break;
928 
929 		err = got_object_get_type(&obj_type, repo, &qid->id);
930 		if (err)
931 			break;
932 		switch (obj_type) {
933 		case GOT_OBJ_TYPE_COMMIT:
934 			err = got_object_open_as_commit(&commit, repo,
935 			    &qid->id);
936 			if (err)
937 				goto done;
938 			break;
939 		case GOT_OBJ_TYPE_TAG:
940 			err = got_object_open_as_tag(&tag, repo, &qid->id);
941 			if (err)
942 				goto done;
943 			break;
944 		default:
945 			/* should not happen */
946 			err = got_error(GOT_ERR_OBJ_TYPE);
947 			goto done;
948 		}
949 
950 		/* Find a tree object to scan. */
951 		if (commit) {
952 			tree_id = got_object_commit_get_tree_id(commit);
953 		} else if (tag) {
954 			obj_type = got_object_tag_get_object_type(tag);
955 			switch (obj_type) {
956 			case GOT_OBJ_TYPE_COMMIT:
957 				err = got_object_open_as_commit(&commit, repo,
958 				    got_object_tag_get_object_id(tag));
959 				if (err)
960 					goto done;
961 				tree_id = got_object_commit_get_tree_id(commit);
962 				break;
963 			case GOT_OBJ_TYPE_TREE:
964 				tree_id = got_object_tag_get_object_id(tag);
965 				break;
966 			default:
967 				/*
968 				 * Tag points at something other than a
969 				 * commit or tree. Leave this weird tag object
970 				 * and the object it points to.
971 				 */
972 				if (got_object_idset_contains(traversed_ids,
973 				    got_object_tag_get_object_id(tag)))
974 					break;
975 				err = got_object_idset_add(traversed_ids,
976 				    got_object_tag_get_object_id(tag), NULL);
977 				if (err)
978 					goto done;
979 				break;
980 			}
981 		}
982 
983 		if (tree_id) {
984 			err = load_tree(traversed_ids, tree_id, "",
985 			    repo, cancel_cb, cancel_arg);
986 			if (err)
987 				break;
988 		}
989 
990 		if (commit || tag)
991 			(*ncommits)++; /* scanned tags are counted as commits */
992 
993 		err = report_cleanup_progress(progress_cb, progress_arg, rl,
994 		    *ncommits, -1, -1, -1);
995 		if (err)
996 			break;
997 
998 		if (commit) {
999 			/* Find parent commits to scan. */
1000 			const struct got_object_id_queue *parent_ids;
1001 			parent_ids = got_object_commit_get_parent_ids(commit);
1002 			err = got_object_id_queue_copy(parent_ids, &ids);
1003 			if (err)
1004 				break;
1005 			got_object_commit_close(commit);
1006 			commit = NULL;
1007 		}
1008 		if (tag) {
1009 			got_object_tag_close(tag);
1010 			tag = NULL;
1011 		}
1012 		got_object_qid_free(qid);
1013 		qid = NULL;
1014 	}
1015 done:
1016 	if (qid)
1017 		got_object_qid_free(qid);
1018 	if (commit)
1019 		got_object_commit_close(commit);
1020 	if (tag)
1021 		got_object_tag_close(tag);
1022 	got_object_id_queue_free(&ids);
1023 	return err;
1024 }
1025 
1026 static const struct got_error *
1027 is_object_packed(int *packed, struct got_repository *repo,
1028     struct got_object_id *id)
1029 {
1030 	const struct got_error *err;
1031 	struct got_object *obj;
1032 
1033 	*packed = 0;
1034 
1035 	err = got_object_open_packed(&obj, id, repo);
1036 	if (err) {
1037 		if (err->code == GOT_ERR_NO_OBJ)
1038 			err = NULL;
1039 		return err;
1040 	}
1041 	got_object_close(obj);
1042 	*packed = 1;
1043 	return NULL;
1044 }
1045 
1046 struct purge_loose_object_arg {
1047 	struct got_repository *repo;
1048 	got_cleanup_progress_cb progress_cb;
1049 	void *progress_arg;
1050 	struct got_ratelimit *rl;
1051 	struct got_object_idset *traversed_ids;
1052 	int nloose;
1053 	int ncommits;
1054 	int npacked;
1055 	int npurged;
1056 	off_t size_purged;
1057 	int dry_run;
1058 	time_t max_mtime;
1059 	int ignore_mtime;
1060 };
1061 
1062 static const struct got_error *
1063 purge_loose_object(struct got_object_id *id, void *data, void *arg)
1064 {
1065 	struct purge_loose_object_arg *a = arg;
1066 	const struct got_error *err, *unlock_err = NULL;
1067 	char *path = NULL;
1068 	int packed, fd = -1;
1069 	struct stat sb;
1070 	struct got_lockfile *lf = NULL;
1071 
1072 	err = is_object_packed(&packed, a->repo, id);
1073 	if (err)
1074 		return err;
1075 
1076 	if (!packed && got_object_idset_contains(a->traversed_ids, id))
1077 		return NULL;
1078 
1079 	if (packed)
1080 		a->npacked++;
1081 
1082 	err = got_object_get_path(&path, id, a->repo);
1083 	if (err)
1084 		return err;
1085 
1086 	err = got_object_open_loose_fd(&fd, id, a->repo);
1087 	if (err)
1088 		goto done;
1089 
1090 	if (fstat(fd, &sb) == -1) {
1091 		err = got_error_from_errno("fstat");
1092 		goto done;
1093 	}
1094 
1095 	/*
1096 	 * Do not delete objects which are younger than our maximum
1097 	 * modification time threshold. This prevents a race where
1098 	 * new objects which are being added to the repository
1099 	 * concurrently would be deleted.
1100 	 */
1101 	if (a->ignore_mtime || sb.st_mtime <= a->max_mtime) {
1102 		if (!a->dry_run) {
1103 			err = got_lockfile_lock(&lf, path, -1);
1104 			if (err)
1105 				goto done;
1106 			if (unlink(path) == -1) {
1107 				err = got_error_from_errno2("unlink", path);
1108 				goto done;
1109 			}
1110 		}
1111 
1112 		a->npurged++;
1113 		a->size_purged += sb.st_size;
1114 		err = report_cleanup_progress(a->progress_cb, a->progress_arg,
1115 		    a->rl, a->ncommits, a->nloose, a->npurged, -1);
1116 		if (err)
1117 			goto done;
1118 	}
1119 done:
1120 	if (fd != -1 && close(fd) == -1 && err == NULL)
1121 		err = got_error_from_errno("close");
1122 	free(path);
1123 	if (lf)
1124 		unlock_err = got_lockfile_unlock(lf, -1);
1125 	return err ? err : unlock_err;
1126 }
1127 
1128 static const struct got_error *
1129 repo_purge_unreferenced_loose_objects(struct got_repository *repo,
1130     struct got_object_idset *traversed_ids,
1131     off_t *size_before, off_t *size_after, int ncommits, int *nloose,
1132     int *npacked, int *npurged, int dry_run, int ignore_mtime,
1133     time_t max_mtime, struct got_ratelimit *rl,
1134     got_cleanup_progress_cb progress_cb, void *progress_arg,
1135     got_cancel_cb cancel_cb, void *cancel_arg)
1136 {
1137 	const struct got_error *err;
1138 	struct got_object_idset *loose_ids;
1139 	struct purge_loose_object_arg arg;
1140 
1141 	err = get_loose_object_ids(&loose_ids, size_before, ncommits,
1142 	    progress_cb, progress_arg, rl, repo);
1143 	if (err)
1144 		return err;
1145 	*nloose = got_object_idset_num_elements(loose_ids);
1146 	if (*nloose == 0) {
1147 		got_object_idset_free(loose_ids);
1148 		if (progress_cb) {
1149 			err = progress_cb(progress_arg, 0, 0, 0, -1);
1150 			if (err)
1151 				return err;
1152 		}
1153 		return NULL;
1154 	}
1155 
1156 	memset(&arg, 0, sizeof(arg));
1157 	arg.repo = repo;
1158 	arg.progress_arg = progress_arg;
1159 	arg.progress_cb = progress_cb;
1160 	arg.rl = rl;
1161 	arg.traversed_ids = traversed_ids;
1162 	arg.nloose = *nloose;
1163 	arg.npacked = 0;
1164 	arg.npurged = 0;
1165 	arg.size_purged = 0;
1166 	arg.dry_run = dry_run;
1167 	arg.max_mtime = max_mtime;
1168 	arg.ignore_mtime = ignore_mtime;
1169 	err = got_object_idset_for_each(loose_ids, purge_loose_object, &arg);
1170 	if (err)
1171 		goto done;
1172 
1173 	*size_after = *size_before - arg.size_purged;
1174 	*npacked = arg.npacked;
1175 	*npurged = arg.npurged;
1176 
1177 	/* Produce a final progress report. */
1178 	if (progress_cb) {
1179 		err = progress_cb(progress_arg, ncommits, *nloose,
1180 		    arg.npurged, -1);
1181 		if (err)
1182 			goto done;
1183 	}
1184 done:
1185 	got_object_idset_free(loose_ids);
1186 	return err;
1187 }
1188 
1189 static const struct got_error *
1190 purge_redundant_pack(struct got_repository *repo, const char *packidx_path,
1191     int dry_run, int ignore_mtime, time_t max_mtime,
1192     int *remove, off_t *size_before, off_t *size_after)
1193 {
1194 	static const char *ext[] = {".idx", ".pack", ".rev", ".bitmap",
1195 	    ".promisor", ".mtimes"};
1196 	struct stat sb;
1197 	char *dot, path[PATH_MAX];
1198 	size_t i;
1199 
1200 	if (strlcpy(path, packidx_path, sizeof(path)) >= sizeof(path))
1201 		return got_error(GOT_ERR_NO_SPACE);
1202 
1203 	/*
1204 	 * Do not delete pack files which are younger than our maximum
1205 	 * modification time threshold.  This prevents a race where a
1206 	 * new pack file which is being added to the repository
1207 	 * concurrently would be deleted.
1208 	 */
1209 	if (fstatat(got_repo_get_fd(repo), path, &sb, 0) == -1) {
1210 		if (errno == ENOENT)
1211 			return NULL;
1212 		return got_error_from_errno2("fstatat", path);
1213 	}
1214 	if (!ignore_mtime && sb.st_mtime > max_mtime)
1215 		*remove = 0;
1216 
1217 	/*
1218 	 * For compatibility with Git, if a matching .keep file exist
1219 	 * don't delete the packfile.
1220 	 */
1221 	dot = strrchr(path, '.');
1222 	*dot = '\0';
1223 	if (strlcat(path, ".keep", sizeof(path)) >= sizeof(path))
1224 		return got_error(GOT_ERR_NO_SPACE);
1225 	if (faccessat(got_repo_get_fd(repo), path, F_OK, 0) == 0)
1226 		*remove = 0;
1227 
1228 	for (i = 0; i < nitems(ext); ++i) {
1229 		*dot = '\0';
1230 
1231 		if (strlcat(path, ext[i], sizeof(path)) >=
1232 		    sizeof(path))
1233 			return got_error(GOT_ERR_NO_SPACE);
1234 
1235 		if (fstatat(got_repo_get_fd(repo), path, &sb, 0) ==
1236 		    -1) {
1237 			if (errno == ENOENT)
1238 				continue;
1239 			return got_error_from_errno2("fstatat", path);
1240 		}
1241 
1242 		*size_before += sb.st_size;
1243 		if (!*remove) {
1244 			*size_after += sb.st_size;
1245 			continue;
1246 		}
1247 
1248 		if (dry_run)
1249 			continue;
1250 
1251 		if (unlinkat(got_repo_get_fd(repo), path, 0) == -1) {
1252 			if (errno == ENOENT)
1253 				continue;
1254 			return got_error_from_errno2("unlinkat",
1255 			    path);
1256 		}
1257 	}
1258 
1259 	return NULL;
1260 }
1261 
1262 static const struct got_error *
1263 pack_is_redundant(int *redundant, struct got_repository *repo,
1264     struct got_object_idset *traversed_ids,
1265     const char *packidx_path, struct got_object_idset *idset)
1266 {
1267 	const struct got_error *err;
1268 	struct got_packidx *packidx;
1269 	struct got_packidx_object_id *pid;
1270 	struct got_object_id id;
1271 	size_t i, nobjects;
1272 
1273 	*redundant = 1;
1274 
1275 	err = got_repo_get_packidx(&packidx, packidx_path, repo);
1276 	if (err)
1277 		return err;
1278 
1279 	nobjects = be32toh(packidx->hdr.fanout_table[0xff]);
1280 	for (i = 0; i < nobjects; ++i) {
1281 		pid = &packidx->hdr.sorted_ids[i];
1282 
1283 		memset(&id, 0, sizeof(id));
1284 		memcpy(&id.sha1, pid->sha1, sizeof(id.sha1));
1285 
1286 		if (got_object_idset_contains(idset, &id))
1287 			continue;
1288 
1289 		if (!got_object_idset_contains(traversed_ids, &id))
1290 			continue;
1291 
1292 		*redundant = 0;
1293 		err = got_object_idset_add(idset, &id, NULL);
1294 		if (err)
1295 			return err;
1296 	}
1297 
1298 	return NULL;
1299 }
1300 
1301 struct pack_info {
1302 	const char	*path;
1303 	size_t		 nobjects;
1304 };
1305 
1306 static int
1307 pack_info_cmp(const void *a, const void *b)
1308 {
1309 	const struct pack_info	*pa, *pb;
1310 
1311 	pa = a;
1312 	pb = b;
1313 	if (pa->nobjects == pb->nobjects)
1314 		return strcmp(pa->path, pb->path);
1315 	if (pa->nobjects > pb->nobjects)
1316 		return -1;
1317 	return 1;
1318 }
1319 
1320 static const struct got_error *
1321 repo_purge_redundant_packfiles(struct got_repository *repo,
1322     struct got_object_idset *traversed_ids,
1323     off_t *size_before, off_t *size_after, int dry_run, int ignore_mtime,
1324     time_t max_mtime, int nloose, int ncommits, int npurged,
1325     struct got_ratelimit *rl,
1326     got_cleanup_progress_cb progress_cb, void *progress_arg,
1327     got_cancel_cb cancel_cb, void *cancel_arg)
1328 {
1329 	const struct got_error *err;
1330 	struct pack_info *pinfo, *sorted = NULL;
1331 	struct got_packidx *packidx;
1332 	struct got_object_idset *idset = NULL;
1333 	struct got_pathlist_entry *pe;
1334 	size_t i, npacks;
1335 	int remove, redundant_packs = 0;
1336 
1337 	npacks = 0;
1338 	TAILQ_FOREACH(pe, &repo->packidx_paths, entry)
1339 		npacks++;
1340 
1341 	if (npacks == 0)
1342 		return NULL;
1343 
1344 	sorted = calloc(npacks, sizeof(*sorted));
1345 	if (sorted == NULL)
1346 		return got_error_from_errno("calloc");
1347 
1348 	i = 0;
1349 	TAILQ_FOREACH(pe, &repo->packidx_paths, entry) {
1350 		err = got_repo_get_packidx(&packidx, pe->path, repo);
1351 		if (err)
1352 			goto done;
1353 
1354 		pinfo = &sorted[i++];
1355 		pinfo->path = pe->path;
1356 		pinfo->nobjects = be32toh(packidx->hdr.fanout_table[0xff]);
1357 	}
1358 	qsort(sorted, npacks, sizeof(*sorted), pack_info_cmp);
1359 
1360 	idset = got_object_idset_alloc();
1361 	if (idset == NULL) {
1362 		err = got_error_from_errno("got_object_idset_alloc");
1363 		goto done;
1364 	}
1365 
1366 	for (i = 0; i < npacks; ++i) {
1367 		if (cancel_cb) {
1368 			err = (*cancel_cb)(cancel_arg);
1369 			if (err)
1370 				break;
1371 		}
1372 
1373 		err = pack_is_redundant(&remove, repo, traversed_ids,
1374 		    sorted[i].path, idset);
1375 		if (err)
1376 			goto done;
1377 		err = purge_redundant_pack(repo, sorted[i].path, dry_run,
1378 		    ignore_mtime, max_mtime, &remove, size_before, size_after);
1379 		if (err)
1380 			goto done;
1381 		if (!remove)
1382 			continue;
1383 		err = report_cleanup_progress(progress_cb, progress_arg,
1384 		    rl, ncommits, nloose, npurged, ++redundant_packs);
1385 		if (err)
1386 			goto done;
1387 	}
1388 
1389 	/* Produce a final progress report. */
1390 	if (progress_cb) {
1391 		err = progress_cb(progress_arg, ncommits, nloose, npurged,
1392 		    redundant_packs);
1393 		if (err)
1394 			goto done;
1395 	}
1396  done:
1397 	free(sorted);
1398 	if (idset)
1399 		got_object_idset_free(idset);
1400 	return err;
1401 }
1402 
1403 const struct got_error *
1404 got_repo_cleanup(struct got_repository *repo,
1405     off_t *loose_before, off_t *loose_after,
1406     off_t *pack_before, off_t *pack_after,
1407     int *ncommits, int *nloose, int *npacked, int dry_run, int ignore_mtime,
1408     got_cleanup_progress_cb progress_cb, void *progress_arg,
1409     got_cancel_cb cancel_cb, void *cancel_arg)
1410 {
1411 	const struct got_error *unlock_err, *err = NULL;
1412 	struct got_lockfile *lk = NULL;
1413 	struct got_ratelimit rl;
1414 	struct got_reflist_head refs;
1415 	struct got_object_idset *traversed_ids = NULL;
1416 	struct got_reflist_entry *re;
1417 	struct got_object_id **referenced_ids;
1418 	int i, nreferenced;
1419 	int npurged = 0;
1420 	time_t max_mtime = 0;
1421 
1422 	TAILQ_INIT(&refs);
1423 	got_ratelimit_init(&rl, 0, 500);
1424 
1425 	*loose_before = 0;
1426 	*loose_after = 0;
1427 	*pack_before = 0;
1428 	*pack_after = 0;
1429 	*ncommits = 0;
1430 	*nloose = 0;
1431 	*npacked = 0;
1432 
1433 	err = repo_cleanup_lock(repo, &lk);
1434 	if (err)
1435 		return err;
1436 
1437 	traversed_ids = got_object_idset_alloc();
1438 	if (traversed_ids == NULL) {
1439 		err = got_error_from_errno("got_object_idset_alloc");
1440 		goto done;
1441 	}
1442 
1443 	err = got_ref_list(&refs, repo, "", got_ref_cmp_by_name, NULL);
1444 	if (err)
1445 		goto done;
1446 	if (!ignore_mtime) {
1447 		TAILQ_FOREACH(re, &refs, entry) {
1448 			time_t mtime = got_ref_get_mtime(re->ref);
1449 			if (mtime > max_mtime)
1450 				max_mtime = mtime;
1451 		}
1452 		/*
1453 		 * For safety, keep objects created within 10 minutes
1454 		 * before the youngest reference was created.
1455 		 */
1456 		if (max_mtime >= 600)
1457 			max_mtime -= 600;
1458 	}
1459 
1460 	err = get_reflist_object_ids(&referenced_ids, &nreferenced,
1461 	    (1 << GOT_OBJ_TYPE_COMMIT) | (1 << GOT_OBJ_TYPE_TAG),
1462 	    &refs, repo, cancel_cb, cancel_arg);
1463 	if (err)
1464 		goto done;
1465 
1466 	for (i = 0; i < nreferenced; i++) {
1467 		struct got_object_id *id = referenced_ids[i];
1468 		err = load_commit_or_tag(ncommits, traversed_ids,
1469 		    id, repo, progress_cb, progress_arg, &rl,
1470 		    cancel_cb, cancel_arg);
1471 		if (err)
1472 			goto done;
1473 	}
1474 
1475 	err = repo_purge_unreferenced_loose_objects(repo, traversed_ids,
1476 	    loose_before, loose_after, *ncommits, nloose, npacked, &npurged,
1477 	    dry_run, ignore_mtime, max_mtime, &rl, progress_cb, progress_arg,
1478 	    cancel_cb, cancel_arg);
1479 	if (err)
1480 		goto done;
1481 
1482 	err = repo_purge_redundant_packfiles(repo, traversed_ids,
1483 	    pack_before, pack_after, dry_run, ignore_mtime, max_mtime,
1484 	    *nloose, *ncommits, npurged, &rl, progress_cb, progress_arg,
1485 	    cancel_cb, cancel_arg);
1486 	if (err)
1487 		goto done;
1488 
1489  done:
1490 	if (lk) {
1491 		unlock_err = got_lockfile_unlock(lk, got_repo_get_fd(repo));
1492 		if (err == NULL)
1493 			err = unlock_err;
1494 	}
1495 	if (traversed_ids)
1496 		got_object_idset_free(traversed_ids);
1497 	return err;
1498 }
1499 
1500 const struct got_error *
1501 got_repo_remove_lonely_packidx(struct got_repository *repo, int dry_run,
1502     got_lonely_packidx_progress_cb progress_cb, void *progress_arg,
1503     got_cancel_cb cancel_cb, void *cancel_arg)
1504 {
1505 	const struct got_error *err = NULL;
1506 	DIR *packdir = NULL;
1507 	struct dirent *dent;
1508 	char *pack_relpath = NULL;
1509 	int packdir_fd;
1510 	struct stat sb;
1511 
1512 	packdir_fd = openat(got_repo_get_fd(repo),
1513 	    GOT_OBJECTS_PACK_DIR, O_DIRECTORY | O_CLOEXEC);
1514 	if (packdir_fd == -1) {
1515 		if (errno == ENOENT)
1516 			return NULL;
1517 		return got_error_from_errno_fmt("openat: %s/%s",
1518 		    got_repo_get_path_git_dir(repo),
1519 		    GOT_OBJECTS_PACK_DIR);
1520 	}
1521 
1522 	packdir = fdopendir(packdir_fd);
1523 	if (packdir == NULL) {
1524 		err = got_error_from_errno("fdopendir");
1525 		close(packdir_fd);
1526 		goto done;
1527 	}
1528 
1529 	while ((dent = readdir(packdir)) != NULL) {
1530 		if (cancel_cb) {
1531 			err = cancel_cb(cancel_arg);
1532 			if (err)
1533 				goto done;
1534 		}
1535 
1536 		if (!got_repo_is_packidx_filename(dent->d_name,
1537 		    strlen(dent->d_name)))
1538 			continue;
1539 
1540 		err = got_packidx_get_packfile_path(&pack_relpath,
1541 		    dent->d_name);
1542 		if (err)
1543 			goto done;
1544 
1545 		if (fstatat(packdir_fd, pack_relpath, &sb, 0) != -1) {
1546 			free(pack_relpath);
1547 			pack_relpath = NULL;
1548 			continue;
1549 		}
1550 		if (errno != ENOENT) {
1551 			err = got_error_from_errno_fmt("fstatat: %s/%s/%s",
1552 			    got_repo_get_path_git_dir(repo),
1553 			    GOT_OBJECTS_PACK_DIR,
1554 			    pack_relpath);
1555 			goto done;
1556 		}
1557 
1558 		if (!dry_run) {
1559 			if (unlinkat(packdir_fd, dent->d_name, 0) == -1) {
1560 				err = got_error_from_errno("unlinkat");
1561 				goto done;
1562 			}
1563 		}
1564 		if (progress_cb) {
1565 			char *path;
1566 			if (asprintf(&path, "%s/%s/%s",
1567 			    got_repo_get_path_git_dir(repo),
1568 			    GOT_OBJECTS_PACK_DIR,
1569 			    dent->d_name) == -1) {
1570 				err = got_error_from_errno("asprintf");
1571 				goto done;
1572 			}
1573 			err = progress_cb(progress_arg, path);
1574 			free(path);
1575 			if (err)
1576 				goto done;
1577 		}
1578 		free(pack_relpath);
1579 		pack_relpath = NULL;
1580 	}
1581 done:
1582 	if (packdir && closedir(packdir) != 0 && err == NULL)
1583 		err = got_error_from_errno("closedir");
1584 	free(pack_relpath);
1585 	return err;
1586 }