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 <sys/types.h>
18 #include <sys/queue.h>
19 #include <sys/tree.h>
20 #include <sys/uio.h>
21 #include <sys/stat.h>
22 #include <sys/socket.h>
23 #include <sys/wait.h>
24 
25 #include <dirent.h>
26 #include <endian.h>
27 #include <errno.h>
28 #include <fcntl.h>
29 #include <stdint.h>
30 #include <sha1.h>
31 #include <sha2.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <limits.h>
36 #include <unistd.h>
37 #include <imsg.h>
38 
39 #include "got_error.h"
40 #include "got_cancel.h"
41 #include "got_object.h"
42 #include "got_reference.h"
43 #include "got_repository.h"
44 #include "got_repository_admin.h"
45 #include "got_opentemp.h"
46 #include "got_path.h"
47 
48 #include "got_lib_delta.h"
49 #include "got_lib_object.h"
50 #include "got_lib_object_idset.h"
51 #include "got_lib_object_cache.h"
52 #include "got_lib_pack.h"
53 #include "got_lib_privsep.h"
54 #include "got_lib_repository.h"
55 #include "got_lib_ratelimit.h"
56 #include "got_lib_pack_create.h"
57 #include "got_lib_hash.h"
58 #include "got_lib_lockfile.h"
59 
60 #ifndef nitems
61 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
62 #endif
63 
64 static const struct got_error *
65 get_reflist_object_ids(struct got_object_id ***ids, int *nobjects,
66     unsigned int wanted_obj_type_mask, struct got_reflist_head *refs,
67     struct got_repository *repo,
68     got_cancel_cb cancel_cb, void *cancel_arg)
69 {
70 	const struct got_error *err = NULL;
71 	const size_t alloc_chunksz = 256;
72 	size_t nalloc;
73 	struct got_reflist_entry *re;
74 	int i;
75 
76 	*ids = NULL;
77 	*nobjects = 0;
78 
79 	err = got_reflist_sort(refs,
80 	    got_ref_cmp_by_commit_timestamp_descending, repo);
81 	if (err)
82 		return err;
83 
84 	*ids = reallocarray(NULL, alloc_chunksz, sizeof(struct got_object_id *));
85 	if (*ids == NULL)
86 		return got_error_from_errno("reallocarray");
87 	nalloc = alloc_chunksz;
88 
89 	TAILQ_FOREACH(re, refs, entry) {
90 		struct got_object_id *id;
91 
92 		if (cancel_cb) {
93 			err = cancel_cb(cancel_arg);
94 			if (err)
95 				goto done;
96 		}
97 
98 		err = got_ref_resolve(&id, repo, re->ref);
99 		if (err)
100 			goto done;
101 
102 		if (wanted_obj_type_mask != GOT_OBJ_TYPE_ANY) {
103 			int obj_type;
104 			err = got_object_get_type(&obj_type, repo, id);
105 			if (err)
106 				goto done;
107 			if ((wanted_obj_type_mask & (1 << obj_type)) == 0) {
108 				free(id);
109 				id = NULL;
110 				continue;
111 			}
112 		}
113 
114 		if (nalloc <= *nobjects) {
115 			struct got_object_id **new;
116 			new = recallocarray(*ids, nalloc,
117 			    nalloc + alloc_chunksz,
118 			    sizeof(struct got_object_id *));
119 			if (new == NULL) {
120 				err = got_error_from_errno(
121 				    "recallocarray");
122 				goto done;
123 			}
124 			*ids = new;
125 			nalloc += alloc_chunksz;
126 		}
127 		(*ids)[*nobjects] = id;
128 		if ((*ids)[*nobjects] == NULL) {
129 			err = got_error_from_errno("got_object_id_dup");
130 			goto done;
131 		}
132 		(*nobjects)++;
133 	}
134 done:
135 	if (err) {
136 		for (i = 0; i < *nobjects; i++)
137 			free((*ids)[i]);
138 		free(*ids);
139 		*ids = NULL;
140 		*nobjects = 0;
141 	}
142 	return err;
143 }
144 
145 const struct got_error *
146 got_repo_pack_objects(FILE **packfile, struct got_object_id **pack_hash,
147     struct got_reflist_head *include_refs,
148     struct got_reflist_head *exclude_refs, struct got_repository *repo,
149     int loose_obj_only, int force_refdelta,
150     got_pack_progress_cb progress_cb, void *progress_arg,
151     got_cancel_cb cancel_cb, void *cancel_arg)
152 {
153 	const struct got_error *err = NULL;
154 	struct got_object_id **ours = NULL, **theirs = NULL;
155 	int nours = 0, ntheirs = 0, packfd = -1, i;
156 	char *tmpfile_path = NULL, *path = NULL, *packfile_path = NULL;
157 	char *sha1_str = NULL;
158 	FILE *delta_cache = NULL;
159 	struct got_ratelimit rl;
160 
161 	*packfile = NULL;
162 	*pack_hash = NULL;
163 
164 	got_ratelimit_init(&rl, 0, 500);
165 
166 	if (asprintf(&path, "%s/%s/packing.pack",
167 	    got_repo_get_path_git_dir(repo), GOT_OBJECTS_PACK_DIR) == -1) {
168 		err = got_error_from_errno("asprintf");
169 		goto done;
170 	}
171 	err = got_opentemp_named_fd(&tmpfile_path, &packfd, path, "");
172 	if (err)
173 		goto done;
174 
175 	if (fchmod(packfd, GOT_DEFAULT_PACK_MODE) == -1) {
176 		err = got_error_from_errno2("fchmod", tmpfile_path);
177 		goto done;
178 	}
179 
180 	delta_cache = got_opentemp();
181 	if (delta_cache == NULL) {
182 		err = got_error_from_errno("got_opentemp");
183 		goto done;
184 	}
185 
186 	err = get_reflist_object_ids(&ours, &nours,
187 	    (1 << GOT_OBJ_TYPE_COMMIT) | (1 << GOT_OBJ_TYPE_TAG),
188 	    include_refs, repo, cancel_cb, cancel_arg);
189 	if (err)
190 		goto done;
191 
192 	if (nours == 0) {
193 		err = got_error(GOT_ERR_CANNOT_PACK);
194 		goto done;
195 	}
196 
197 	if (!TAILQ_EMPTY(exclude_refs)) {
198 		err = get_reflist_object_ids(&theirs, &ntheirs,
199 		    (1 << GOT_OBJ_TYPE_COMMIT) | (1 << GOT_OBJ_TYPE_TAG),
200 		    exclude_refs, repo,
201 		    cancel_cb, cancel_arg);
202 		if (err)
203 			goto done;
204 	}
205 
206 	*pack_hash = calloc(1, sizeof(**pack_hash));
207 	if (*pack_hash == NULL) {
208 		err = got_error_from_errno("calloc");
209 		goto done;
210 	}
211 
212 	err = got_pack_create((*pack_hash)->sha1, packfd, delta_cache,
213 	    theirs, ntheirs, ours, nours, repo, loose_obj_only,
214 	    0, force_refdelta, progress_cb, progress_arg, &rl,
215 	    cancel_cb, cancel_arg);
216 	if (err)
217 		goto done;
218 
219 	err = got_object_id_str(&sha1_str, *pack_hash);
220 	if (err)
221 		goto done;
222 	if (asprintf(&packfile_path, "%s/%s/pack-%s.pack",
223 	    got_repo_get_path_git_dir(repo), GOT_OBJECTS_PACK_DIR,
224 	    sha1_str) == -1) {
225 		err = got_error_from_errno("asprintf");
226 		goto done;
227 	}
228 
229 	if (lseek(packfd, 0L, SEEK_SET) == -1) {
230 		err = got_error_from_errno("lseek");
231 		goto done;
232 	}
233 	if (rename(tmpfile_path, packfile_path) == -1) {
234 		err = got_error_from_errno3("rename", tmpfile_path,
235 		    packfile_path);
236 		goto done;
237 	}
238 	free(tmpfile_path);
239 	tmpfile_path = NULL;
240 
241 	*packfile = fdopen(packfd, "w");
242 	if (*packfile == NULL) {
243 		err = got_error_from_errno2("fdopen", tmpfile_path);
244 		goto done;
245 	}
246 	packfd = -1;
247 done:
248 	for (i = 0; i < nours; i++)
249 		free(ours[i]);
250 	free(ours);
251 	for (i = 0; i < ntheirs; i++)
252 		free(theirs[i]);
253 	free(theirs);
254 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
255 		err = got_error_from_errno2("close", packfile_path);
256 	if (delta_cache && fclose(delta_cache) == EOF && err == NULL)
257 		err = got_error_from_errno("fclose");
258 	if (tmpfile_path && unlink(tmpfile_path) == -1 && err == NULL)
259 		err = got_error_from_errno2("unlink", tmpfile_path);
260 	free(tmpfile_path);
261 	free(packfile_path);
262 	free(sha1_str);
263 	free(path);
264 	if (err) {
265 		free(*pack_hash);
266 		*pack_hash = NULL;
267 		if (*packfile)
268 			fclose(*packfile);
269 		*packfile = NULL;
270 	}
271 	return err;
272 }
273 
274 const struct got_error *
275 got_repo_index_pack(FILE *packfile, struct got_object_id *pack_hash,
276     struct got_repository *repo,
277     got_pack_index_progress_cb progress_cb, void *progress_arg,
278     got_cancel_cb cancel_cb, void *cancel_arg)
279 {
280 	size_t i;
281 	char *path;
282 	int imsg_idxfds[2];
283 	int npackfd = -1, idxfd = -1, nidxfd = -1;
284 	int tmpfds[3];
285 	int idxstatus, done = 0;
286 	const struct got_error *err;
287 	struct imsgbuf idxibuf;
288 	pid_t idxpid;
289 	char *tmpidxpath = NULL;
290 	char *packfile_path = NULL, *idxpath = NULL, *id_str = NULL;
291 	const char *repo_path = got_repo_get_path_git_dir(repo);
292 	struct stat sb;
293 
294 	for (i = 0; i < nitems(tmpfds); i++)
295 		tmpfds[i] = -1;
296 
297 	if (asprintf(&path, "%s/%s/indexing.idx",
298 	    repo_path, GOT_OBJECTS_PACK_DIR) == -1) {
299 		err = got_error_from_errno("asprintf");
300 		goto done;
301 	}
302 	err = got_opentemp_named_fd(&tmpidxpath, &idxfd, path, "");
303 	free(path);
304 	if (err)
305 		goto done;
306 	if (fchmod(idxfd, GOT_DEFAULT_PACK_MODE) == -1) {
307 		err = got_error_from_errno2("fchmod", tmpidxpath);
308 		goto done;
309 	}
310 
311 	nidxfd = dup(idxfd);
312 	if (nidxfd == -1) {
313 		err = got_error_from_errno("dup");
314 		goto done;
315 	}
316 
317 	for (i = 0; i < nitems(tmpfds); i++) {
318 		tmpfds[i] = got_opentempfd();
319 		if (tmpfds[i] == -1) {
320 			err = got_error_from_errno("got_opentempfd");
321 			goto done;
322 		}
323 	}
324 
325 	err = got_object_id_str(&id_str, pack_hash);
326 	if (err)
327 		goto done;
328 
329 	if (asprintf(&packfile_path, "%s/%s/pack-%s.pack",
330 	    repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
331 		err = got_error_from_errno("asprintf");
332 		goto done;
333 	}
334 
335 	if (fstat(fileno(packfile), &sb) == -1) {
336 		err = got_error_from_errno2("fstat", packfile_path);
337 		goto done;
338 	}
339 
340 	if (asprintf(&idxpath, "%s/%s/pack-%s.idx",
341 	    repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
342 		err = got_error_from_errno("asprintf");
343 		goto done;
344 	}
345 
346 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_idxfds) == -1) {
347 		err = got_error_from_errno("socketpair");
348 		goto done;
349 	}
350 	idxpid = fork();
351 	if (idxpid == -1) {
352 		err= got_error_from_errno("fork");
353 		goto done;
354 	} else if (idxpid == 0)
355 		got_privsep_exec_child(imsg_idxfds,
356 		    GOT_PATH_PROG_INDEX_PACK, packfile_path);
357 	if (close(imsg_idxfds[1]) == -1) {
358 		err = got_error_from_errno("close");
359 		goto done;
360 	}
361 	imsg_init(&idxibuf, imsg_idxfds[0]);
362 
363 	npackfd = dup(fileno(packfile));
364 	if (npackfd == -1) {
365 		err = got_error_from_errno("dup");
366 		goto done;
367 	}
368 	err = got_privsep_send_index_pack_req(&idxibuf, pack_hash->sha1,
369 	    npackfd);
370 	if (err != NULL)
371 		goto done;
372 	npackfd = -1;
373 	err = got_privsep_send_index_pack_outfd(&idxibuf, nidxfd);
374 	if (err != NULL)
375 		goto done;
376 	nidxfd = -1;
377 	for (i = 0; i < nitems(tmpfds); i++) {
378 		err = got_privsep_send_tmpfd(&idxibuf, tmpfds[i]);
379 		if (err != NULL)
380 			goto done;
381 		tmpfds[i] = -1;
382 	}
383 	done = 0;
384 	while (!done) {
385 		int nobj_total, nobj_indexed, nobj_loose, nobj_resolved;
386 
387 		if (cancel_cb) {
388 			err = cancel_cb(cancel_arg);
389 			if (err)
390 				goto done;
391 		}
392 
393 		err = got_privsep_recv_index_progress(&done, &nobj_total,
394 		    &nobj_indexed, &nobj_loose, &nobj_resolved,
395 		    &idxibuf);
396 		if (err != NULL)
397 			goto done;
398 		if (nobj_indexed != 0) {
399 			err = progress_cb(progress_arg, sb.st_size,
400 			    nobj_total, nobj_indexed, nobj_loose,
401 			    nobj_resolved);
402 			if (err)
403 				break;
404 		}
405 	}
406 	if (close(imsg_idxfds[0]) == -1) {
407 		err = got_error_from_errno("close");
408 		goto done;
409 	}
410 	if (waitpid(idxpid, &idxstatus, 0) == -1) {
411 		err = got_error_from_errno("waitpid");
412 		goto done;
413 	}
414 
415 	if (rename(tmpidxpath, idxpath) == -1) {
416 		err = got_error_from_errno3("rename", tmpidxpath, idxpath);
417 		goto done;
418 	}
419 	free(tmpidxpath);
420 	tmpidxpath = NULL;
421 
422 done:
423 	if (tmpidxpath && unlink(tmpidxpath) == -1 && err == NULL)
424 		err = got_error_from_errno2("unlink", tmpidxpath);
425 	if (npackfd != -1 && close(npackfd) == -1 && err == NULL)
426 		err = got_error_from_errno("close");
427 	if (idxfd != -1 && close(idxfd) == -1 && err == NULL)
428 		err = got_error_from_errno("close");
429 	for (i = 0; i < nitems(tmpfds); i++) {
430 		if (tmpfds[i] != -1 && close(tmpfds[i]) == -1 && err == NULL)
431 			err = got_error_from_errno("close");
432 	}
433 	free(tmpidxpath);
434 	free(idxpath);
435 	free(packfile_path);
436 	return err;
437 }
438 
439 const struct got_error *
440 got_repo_find_pack(FILE **packfile, struct got_object_id **pack_hash,
441     struct got_repository *repo, const char *packfile_path)
442 {
443 	const struct got_error *err = NULL;
444 	const char *packdir_path = NULL;
445 	char *packfile_name = NULL, *p, *dot;
446 	struct got_object_id id;
447 	int packfd = -1;
448 
449 	*packfile = NULL;
450 	*pack_hash = NULL;
451 
452 	packdir_path = got_repo_get_path_objects_pack(repo);
453 	if (packdir_path == NULL)
454 		return got_error_from_errno("got_repo_get_path_objects_pack");
455 
456 	if (!got_path_is_child(packfile_path, packdir_path,
457 	    strlen(packdir_path))) {
458 		err = got_error_path(packfile_path, GOT_ERR_BAD_PATH);
459 		goto done;
460 
461 	}
462 
463 	err = got_path_basename(&packfile_name, packfile_path);
464 	if (err)
465 		goto done;
466 	p = packfile_name;
467 
468 	if (strncmp(p, "pack-", 5) != 0) {
469 		err = got_error_fmt(GOT_ERR_BAD_PATH,
470 		    "'%s' is not a valid pack file name",
471 		    packfile_name);
472 		goto done;
473 	}
474 	p += 5;
475 	dot = strchr(p, '.');
476 	if (dot == NULL) {
477 		err = got_error_fmt(GOT_ERR_BAD_PATH,
478 		    "'%s' is not a valid pack file name",
479 		    packfile_name);
480 		goto done;
481 	}
482 	if (strcmp(dot + 1, "pack") != 0) {
483 		err = got_error_fmt(GOT_ERR_BAD_PATH,
484 		    "'%s' is not a valid pack file name",
485 		    packfile_name);
486 		goto done;
487 	}
488 	*dot = '\0';
489 	if (!got_parse_object_id(&id, p, repo->algo)) {
490 		err = got_error_fmt(GOT_ERR_BAD_PATH,
491 		    "'%s' is not a valid pack file name",
492 		    packfile_name);
493 		goto done;
494 	}
495 
496 	*pack_hash = got_object_id_dup(&id);
497 	if (*pack_hash == NULL) {
498 		err = got_error_from_errno("got_object_id_dup");
499 		goto done;
500 	}
501 
502 	packfd = open(packfile_path, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
503 	if (packfd == -1) {
504 		err = got_error_from_errno2("open", packfile_path);
505 		goto done;
506 	}
507 
508 	*packfile = fdopen(packfd, "r");
509 	if (*packfile == NULL) {
510 		err = got_error_from_errno2("fdopen", packfile_path);
511 		goto done;
512 	}
513 	packfd = -1;
514 done:
515 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
516 		err = got_error_from_errno2("close", packfile_path);
517 	free(packfile_name);
518 	if (err) {
519 		free(*pack_hash);
520 		*pack_hash = NULL;
521 	}
522 	return err;
523 }
524 
525 const struct got_error *
526 got_repo_list_pack(FILE *packfile, struct got_object_id *pack_hash,
527     struct got_repository *repo, got_pack_list_cb list_cb, void *list_arg,
528     got_cancel_cb cancel_cb, void *cancel_arg)
529 {
530 	const struct got_error *err = NULL;
531 	char *id_str = NULL, *idxpath = NULL, *packpath = NULL;
532 	struct got_packidx *packidx = NULL;
533 	struct got_pack *pack = NULL;
534 	uint32_t nobj, i;
535 
536 	err = got_object_id_str(&id_str, pack_hash);
537 	if (err)
538 		goto done;
539 
540 	if (asprintf(&packpath, "%s/pack-%s.pack",
541 	    GOT_OBJECTS_PACK_DIR, id_str) == -1) {
542 		err = got_error_from_errno("asprintf");
543 		goto done;
544 	}
545 	if (asprintf(&idxpath, "%s/pack-%s.idx",
546 	    GOT_OBJECTS_PACK_DIR, id_str) == -1) {
547 		err = got_error_from_errno("asprintf");
548 		goto done;
549 	}
550 
551 	err = got_packidx_open(&packidx, got_repo_get_fd(repo), idxpath, 1);
552 	if (err)
553 		goto done;
554 
555 	err = got_repo_cache_pack(&pack, repo, packpath, packidx);
556 	if (err)
557 		goto done;
558 
559 	nobj = be32toh(packidx->hdr.fanout_table[0xff]);
560 	for (i = 0; i < nobj; i++) {
561 		struct got_packidx_object_id *oid;
562 		struct got_object_id id, base_id;
563 		off_t offset, base_offset = 0;
564 		uint8_t type;
565 		uint64_t size;
566 		size_t tslen, len;
567 
568 		if (cancel_cb) {
569 			err = cancel_cb(cancel_arg);
570 			if (err)
571 				break;
572 		}
573 		oid = &packidx->hdr.sorted_ids[i];
574 		memcpy(id.sha1, oid->sha1, SHA1_DIGEST_LENGTH);
575 
576 		offset = got_packidx_get_object_offset(packidx, i);
577 		if (offset == -1) {
578 			err = got_error(GOT_ERR_BAD_PACKIDX);
579 			goto done;
580 		}
581 
582 		err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
583 		    pack, offset);
584 		if (err)
585 			goto done;
586 
587 		switch (type) {
588 		case GOT_OBJ_TYPE_OFFSET_DELTA:
589 			err = got_pack_parse_offset_delta(&base_offset, &len,
590 			    pack, offset, tslen);
591 			if (err)
592 				goto done;
593 			break;
594 		case GOT_OBJ_TYPE_REF_DELTA:
595 			err = got_pack_parse_ref_delta(&base_id,
596 			    pack, offset, tslen);
597 			if (err)
598 				goto done;
599 			break;
600 		}
601 		err = (*list_cb)(list_arg, &id, type, offset, size,
602 		    base_offset, &base_id);
603 		if (err)
604 			goto done;
605 	}
606 
607 done:
608 	free(id_str);
609 	free(idxpath);
610 	free(packpath);
611 	if (packidx)
612 		got_packidx_close(packidx);
613 	return err;
614 }
615 
616 const struct got_error *
617 got_repo_cleanup_prepare(struct got_repository *repo,
618     struct got_lockfile **lk)
619 {
620 	const struct got_error *err;
621 	char myname[_POSIX_HOST_NAME_MAX + 1];
622 
623 	if (gethostname(myname, sizeof(myname)) == -1)
624 		return got_error_from_errno("gethostname");
625 
626 	err = got_lockfile_lock(lk, "gc.pid", got_repo_get_fd(repo));
627 	if (err)
628 		return err;
629 
630 	/*
631 	 * Git uses these info to provide some verbiage when finds a
632 	 * lock during `git gc --force' so don't try too hard to avoid
633 	 * short writes and don't care if a race happens between the
634 	 * lockfile creation and the write itself.
635 	 */
636 	if (dprintf((*lk)->fd, "%d %s", getpid(), myname) < 0)
637 		return got_error_from_errno("dprintf");
638 
639 	return NULL;
640 }
641 
642 const struct got_error *
643 got_repo_cleanup_complete(struct got_repository *repo,
644     struct got_lockfile *lk)
645 {
646 	if (lk == NULL)
647 		return NULL;
648 
649 	return got_lockfile_unlock(lk, got_repo_get_fd(repo));
650 }
651 
652 static const struct got_error *
653 report_cleanup_progress(got_cleanup_progress_cb progress_cb,
654     void *progress_arg, struct got_ratelimit *rl,
655     int nloose, int ncommits, int npurged, int nredundant)
656 {
657 	const struct got_error *err;
658 	int elapsed;
659 
660 	if (progress_cb == NULL)
661 		return NULL;
662 
663 	err = got_ratelimit_check(&elapsed, rl);
664 	if (err || !elapsed)
665 		return err;
666 
667 	return progress_cb(progress_arg, nloose, ncommits, npurged, nredundant);
668 }
669 
670 static const struct got_error *
671 get_loose_object_ids(struct got_object_idset **loose_ids, off_t *ondisk_size,
672     got_cleanup_progress_cb progress_cb, void *progress_arg,
673     struct got_ratelimit *rl, struct got_repository *repo)
674 {
675 	const struct got_error *err = NULL;
676 	char *path_objects = NULL, *path = NULL;
677 	DIR *dir = NULL;
678 	struct got_object *obj = NULL;
679 	struct got_object_id id;
680 	int i, fd = -1;
681 	struct stat sb;
682 
683 	*ondisk_size = 0;
684 	*loose_ids = got_object_idset_alloc();
685 	if (*loose_ids == NULL)
686 		return got_error_from_errno("got_object_idset_alloc");
687 
688 	path_objects = got_repo_get_path_objects(repo);
689 	if (path_objects == NULL) {
690 		err = got_error_from_errno("got_repo_get_path_objects");
691 		goto done;
692 	}
693 
694 	for (i = 0; i <= 0xff; i++) {
695 		struct dirent *dent;
696 
697 		if (asprintf(&path, "%s/%.2x", path_objects, i) == -1) {
698 			err = got_error_from_errno("asprintf");
699 			break;
700 		}
701 
702 		dir = opendir(path);
703 		if (dir == NULL) {
704 			if (errno == ENOENT) {
705 				err = NULL;
706 				continue;
707 			}
708 			err = got_error_from_errno2("opendir", path);
709 			break;
710 		}
711 
712 		while ((dent = readdir(dir)) != NULL) {
713 			char *id_str;
714 
715 			if (strcmp(dent->d_name, ".") == 0 ||
716 			    strcmp(dent->d_name, "..") == 0)
717 				continue;
718 
719 			if (asprintf(&id_str, "%.2x%s", i, dent->d_name) == -1) {
720 				err = got_error_from_errno("asprintf");
721 				goto done;
722 			}
723 
724 			if (!got_parse_object_id(&id, id_str, repo->algo)) {
725 				free(id_str);
726 				continue;
727 			}
728 			free(id_str);
729 
730 			err = got_object_open_loose_fd(&fd, &id, repo);
731 			if (err)
732 				goto done;
733 			if (fstat(fd, &sb) == -1) {
734 				err = got_error_from_errno("fstat");
735 				goto done;
736 			}
737 			err = got_object_read_header_privsep(&obj, &id, repo,
738 			    fd);
739 			if (err)
740 				goto done;
741 			fd = -1; /* already closed */
742 
743 			switch (obj->type) {
744 			case GOT_OBJ_TYPE_COMMIT:
745 			case GOT_OBJ_TYPE_TREE:
746 			case GOT_OBJ_TYPE_BLOB:
747 			case GOT_OBJ_TYPE_TAG:
748 				break;
749 			default:
750 				err = got_error_fmt(GOT_ERR_OBJ_TYPE,
751 				    "%d", obj->type);
752 				goto done;
753 			}
754 			got_object_close(obj);
755 			obj = NULL;
756 			(*ondisk_size) += sb.st_size;
757 			err = got_object_idset_add(*loose_ids, &id, NULL);
758 			if (err)
759 				goto done;
760 			err = report_cleanup_progress(progress_cb,
761 			    progress_arg, rl,
762 			    got_object_idset_num_elements(*loose_ids),
763 			    -1, -1, -1);
764 			if (err)
765 				goto done;
766 		}
767 
768 		if (closedir(dir) != 0) {
769 			err = got_error_from_errno("closedir");
770 			goto done;
771 		}
772 		dir = NULL;
773 
774 		free(path);
775 		path = NULL;
776 	}
777 done:
778 	if (dir && closedir(dir) != 0 && err == NULL)
779 		err = got_error_from_errno("closedir");
780 	if (fd != -1 && close(fd) == -1 && err == NULL)
781 		err = got_error_from_errno("close");
782 	if (err) {
783 		got_object_idset_free(*loose_ids);
784 		*loose_ids = NULL;
785 	}
786 	if (obj)
787 		got_object_close(obj);
788 	free(path_objects);
789 	free(path);
790 	return err;
791 }
792 
793 static const struct got_error *
794 preserve_loose_object(struct got_object_idset *loose_ids,
795     struct got_object_id *id, struct got_repository *repo, int *npacked)
796 {
797 	const struct got_error *err = NULL;
798 	struct got_object *obj;
799 
800 	if (!got_object_idset_contains(loose_ids, id))
801 		return NULL;
802 
803 	/*
804 	 * Try to open this object from a pack file. This ensures that
805 	 * we do in fact have a valid packed copy of the object. Otherwise
806 	 * we should not delete the loose representation of this object.
807 	 */
808 	err = got_object_open_packed(&obj, id, repo);
809 	if (err == NULL) {
810 		got_object_close(obj);
811 		/*
812 		 * The object is referenced and packed.
813 		 * We can purge the redundantly stored loose object.
814 		 */
815 		(*npacked)++;
816 		return NULL;
817 	} else if (err->code != GOT_ERR_NO_OBJ)
818 		return err;
819 
820 	/*
821 	 * This object is referenced and not packed.
822 	 * Remove it from our purge set.
823 	 */
824 	return got_object_idset_remove(NULL, loose_ids, id);
825 }
826 
827 static const struct got_error *
828 load_tree_entries(struct got_object_id_queue *ids,
829     struct got_object_idset *loose_ids,
830     struct got_object_idset *traversed_ids, struct got_object_id *tree_id,
831     const char *dpath, struct got_repository *repo, int *npacked,
832     got_cancel_cb cancel_cb, void *cancel_arg)
833 {
834 	const struct got_error *err;
835 	struct got_tree_object *tree;
836 	char *p = NULL;
837 	int i;
838 
839 	err = got_object_open_as_tree(&tree, repo, tree_id);
840 	if (err)
841 		return err;
842 
843 	for (i = 0; i < got_object_tree_get_nentries(tree); i++) {
844 		struct got_tree_entry *e = got_object_tree_get_entry(tree, i);
845 		struct got_object_id *id = got_tree_entry_get_id(e);
846 		mode_t mode = got_tree_entry_get_mode(e);
847 
848 		if (cancel_cb) {
849 			err = (*cancel_cb)(cancel_arg);
850 			if (err)
851 				break;
852 		}
853 
854 		if (got_object_tree_entry_is_symlink(e) ||
855 		    got_object_tree_entry_is_submodule(e) ||
856 		    got_object_idset_contains(traversed_ids, id))
857 			continue;
858 
859 		if (asprintf(&p, "%s%s%s", dpath, dpath[0] != '\0' ? "/" : "",
860 		    got_tree_entry_get_name(e)) == -1) {
861 			err = got_error_from_errno("asprintf");
862 			break;
863 		}
864 
865 		if (S_ISDIR(mode)) {
866 			struct got_object_qid *qid;
867 			err = got_object_qid_alloc(&qid, id);
868 			if (err)
869 				break;
870 			STAILQ_INSERT_TAIL(ids, qid, entry);
871 		} else if (S_ISREG(mode)) {
872 			/* This blob is referenced. */
873 			err = preserve_loose_object(loose_ids, id, repo,
874 			    npacked);
875 			if (err)
876 				break;
877 			err = got_object_idset_add(traversed_ids, id, NULL);
878 			if (err)
879 				break;
880 		}
881 		free(p);
882 		p = NULL;
883 	}
884 
885 	got_object_tree_close(tree);
886 	free(p);
887 	return err;
888 }
889 
890 static const struct got_error *
891 load_tree(struct got_object_idset *loose_ids,
892     struct got_object_idset *traversed_ids, struct got_object_id *tree_id,
893     const char *dpath, struct got_repository *repo, int *npacked,
894     got_cancel_cb cancel_cb, void *cancel_arg)
895 {
896 	const struct got_error *err = NULL;
897 	struct got_object_id_queue tree_ids;
898 	struct got_object_qid *qid;
899 
900 	err = got_object_qid_alloc(&qid, tree_id);
901 	if (err)
902 		return err;
903 
904 	STAILQ_INIT(&tree_ids);
905 	STAILQ_INSERT_TAIL(&tree_ids, qid, entry);
906 
907 	while (!STAILQ_EMPTY(&tree_ids)) {
908 		if (cancel_cb) {
909 			err = (*cancel_cb)(cancel_arg);
910 			if (err)
911 				break;
912 		}
913 
914 		qid = STAILQ_FIRST(&tree_ids);
915 		STAILQ_REMOVE_HEAD(&tree_ids, entry);
916 
917 		if (got_object_idset_contains(traversed_ids, &qid->id)) {
918 			got_object_qid_free(qid);
919 			continue;
920 		}
921 
922 		err = got_object_idset_add(traversed_ids, &qid->id, NULL);
923 		if (err) {
924 			got_object_qid_free(qid);
925 			break;
926 		}
927 
928 		/* This tree is referenced. */
929 		err = preserve_loose_object(loose_ids, &qid->id, repo, npacked);
930 		if (err)
931 			break;
932 
933 		err = load_tree_entries(&tree_ids, loose_ids, traversed_ids,
934 		    &qid->id, dpath, repo, npacked, cancel_cb, cancel_arg);
935 		got_object_qid_free(qid);
936 		if (err)
937 			break;
938 	}
939 
940 	got_object_id_queue_free(&tree_ids);
941 	return err;
942 }
943 
944 static const struct got_error *
945 load_commit_or_tag(struct got_object_idset *loose_ids, int *ncommits,
946     int *npacked, struct got_object_idset *traversed_ids,
947     struct got_object_id *id, struct got_repository *repo,
948     got_cleanup_progress_cb progress_cb, void *progress_arg,
949     struct got_ratelimit *rl, int nloose,
950     got_cancel_cb cancel_cb, void *cancel_arg)
951 {
952 	const struct got_error *err;
953 	struct got_commit_object *commit = NULL;
954 	struct got_tag_object *tag = NULL;
955 	struct got_object_id *tree_id = NULL;
956 	struct got_object_id_queue ids;
957 	struct got_object_qid *qid;
958 	int obj_type;
959 
960 	err = got_object_qid_alloc(&qid, id);
961 	if (err)
962 		return err;
963 
964 	STAILQ_INIT(&ids);
965 	STAILQ_INSERT_TAIL(&ids, qid, entry);
966 
967 	while (!STAILQ_EMPTY(&ids)) {
968 		if (cancel_cb) {
969 			err = (*cancel_cb)(cancel_arg);
970 			if (err)
971 				break;
972 		}
973 
974 		qid = STAILQ_FIRST(&ids);
975 		STAILQ_REMOVE_HEAD(&ids, entry);
976 
977 		if (got_object_idset_contains(traversed_ids, &qid->id)) {
978 			got_object_qid_free(qid);
979 			qid = NULL;
980 			continue;
981 		}
982 
983 		err = got_object_idset_add(traversed_ids, &qid->id, NULL);
984 		if (err)
985 			break;
986 
987 		/* This commit or tag is referenced. */
988 		err = preserve_loose_object(loose_ids, &qid->id, repo, npacked);
989 		if (err)
990 			break;
991 
992 		err = got_object_get_type(&obj_type, repo, &qid->id);
993 		if (err)
994 			break;
995 		switch (obj_type) {
996 		case GOT_OBJ_TYPE_COMMIT:
997 			err = got_object_open_as_commit(&commit, repo,
998 			    &qid->id);
999 			if (err)
1000 				goto done;
1001 			break;
1002 		case GOT_OBJ_TYPE_TAG:
1003 			err = got_object_open_as_tag(&tag, repo, &qid->id);
1004 			if (err)
1005 				goto done;
1006 			break;
1007 		default:
1008 			/* should not happen */
1009 			err = got_error(GOT_ERR_OBJ_TYPE);
1010 			goto done;
1011 		}
1012 
1013 		/* Find a tree object to scan. */
1014 		if (commit) {
1015 			tree_id = got_object_commit_get_tree_id(commit);
1016 		} else if (tag) {
1017 			obj_type = got_object_tag_get_object_type(tag);
1018 			switch (obj_type) {
1019 			case GOT_OBJ_TYPE_COMMIT:
1020 				err = got_object_open_as_commit(&commit, repo,
1021 				    got_object_tag_get_object_id(tag));
1022 				if (err)
1023 					goto done;
1024 				tree_id = got_object_commit_get_tree_id(commit);
1025 				break;
1026 			case GOT_OBJ_TYPE_TREE:
1027 				tree_id = got_object_tag_get_object_id(tag);
1028 				break;
1029 			default:
1030 				/*
1031 				 * Tag points at something other than a
1032 				 * commit or tree. Leave this weird tag object
1033 				 * and the object it points to on disk.
1034 				 */
1035 				err = got_object_idset_remove(NULL, loose_ids,
1036 				    &qid->id);
1037 				if (err && err->code != GOT_ERR_NO_OBJ)
1038 					goto done;
1039 				err = got_object_idset_remove(NULL, loose_ids,
1040 				    got_object_tag_get_object_id(tag));
1041 				if (err && err->code != GOT_ERR_NO_OBJ)
1042 					goto done;
1043 				err = NULL;
1044 				break;
1045 			}
1046 		}
1047 
1048 		if (tree_id) {
1049 			err = load_tree(loose_ids, traversed_ids, tree_id, "",
1050 			    repo, npacked, cancel_cb, cancel_arg);
1051 			if (err)
1052 				break;
1053 		}
1054 
1055 		if (commit || tag)
1056 			(*ncommits)++; /* scanned tags are counted as commits */
1057 
1058 		err = report_cleanup_progress(progress_cb, progress_arg, rl,
1059 		    nloose, *ncommits, -1, -1);
1060 		if (err)
1061 			break;
1062 
1063 		if (commit) {
1064 			/* Find parent commits to scan. */
1065 			const struct got_object_id_queue *parent_ids;
1066 			parent_ids = got_object_commit_get_parent_ids(commit);
1067 			err = got_object_id_queue_copy(parent_ids, &ids);
1068 			if (err)
1069 				break;
1070 			got_object_commit_close(commit);
1071 			commit = NULL;
1072 		}
1073 		if (tag) {
1074 			got_object_tag_close(tag);
1075 			tag = NULL;
1076 		}
1077 		got_object_qid_free(qid);
1078 		qid = NULL;
1079 	}
1080 done:
1081 	if (qid)
1082 		got_object_qid_free(qid);
1083 	if (commit)
1084 		got_object_commit_close(commit);
1085 	if (tag)
1086 		got_object_tag_close(tag);
1087 	got_object_id_queue_free(&ids);
1088 	return err;
1089 }
1090 
1091 struct purge_loose_object_arg {
1092 	struct got_repository *repo;
1093 	got_cleanup_progress_cb progress_cb;
1094 	void *progress_arg;
1095 	struct got_ratelimit *rl;
1096 	int nloose;
1097 	int ncommits;
1098 	int npurged;
1099 	off_t size_purged;
1100 	int dry_run;
1101 	time_t max_mtime;
1102 	int ignore_mtime;
1103 };
1104 
1105 static const struct got_error *
1106 purge_loose_object(struct got_object_id *id, void *data, void *arg)
1107 {
1108 	struct purge_loose_object_arg *a = arg;
1109 	const struct got_error *err, *unlock_err = NULL;
1110 	char *path = NULL;
1111 	int fd = -1;
1112 	struct stat sb;
1113 	struct got_lockfile *lf = NULL;
1114 
1115 	err = got_object_get_path(&path, id, a->repo);
1116 	if (err)
1117 		return err;
1118 
1119 	err = got_object_open_loose_fd(&fd, id, a->repo);
1120 	if (err)
1121 		goto done;
1122 
1123 	if (fstat(fd, &sb) == -1) {
1124 		err = got_error_from_errno("fstat");
1125 		goto done;
1126 	}
1127 
1128 	/*
1129 	 * Do not delete objects which are younger than our maximum
1130 	 * modification time threshold. This prevents a race where
1131 	 * new objects which are being added to the repository
1132 	 * concurrently would be deleted.
1133 	 */
1134 	if (a->ignore_mtime || sb.st_mtime <= a->max_mtime) {
1135 		if (!a->dry_run) {
1136 			err = got_lockfile_lock(&lf, path, -1);
1137 			if (err)
1138 				goto done;
1139 			if (unlink(path) == -1) {
1140 				err = got_error_from_errno2("unlink", path);
1141 				goto done;
1142 			}
1143 		}
1144 
1145 		a->npurged++;
1146 		a->size_purged += sb.st_size;
1147 		err = report_cleanup_progress(a->progress_cb, a->progress_arg,
1148 		    a->rl, a->nloose, a->ncommits, a->npurged, -1);
1149 		if (err)
1150 			goto done;
1151 	}
1152 done:
1153 	if (fd != -1 && close(fd) == -1 && err == NULL)
1154 		err = got_error_from_errno("close");
1155 	free(path);
1156 	if (lf)
1157 		unlock_err = got_lockfile_unlock(lf, -1);
1158 	return err ? err : unlock_err;
1159 }
1160 
1161 const struct got_error *
1162 got_repo_purge_unreferenced_loose_objects(struct got_repository *repo,
1163     off_t *size_before, off_t *size_after, int *ncommits, int *nloose,
1164     int *npacked, int dry_run, int ignore_mtime,
1165     got_cleanup_progress_cb progress_cb, void *progress_arg,
1166     got_cancel_cb cancel_cb, void *cancel_arg)
1167 {
1168 	const struct got_error *err;
1169 	struct got_object_idset *loose_ids;
1170 	struct got_object_idset *traversed_ids;
1171 	struct got_object_id **referenced_ids;
1172 	int i, nreferenced;
1173 	struct got_reflist_head refs;
1174 	struct got_reflist_entry *re;
1175 	struct purge_loose_object_arg arg;
1176 	time_t max_mtime = 0;
1177 	struct got_ratelimit rl;
1178 
1179 	TAILQ_INIT(&refs);
1180 	got_ratelimit_init(&rl, 0, 500);
1181 
1182 	*size_before = 0;
1183 	*size_after = 0;
1184 	*npacked = 0;
1185 
1186 	err = get_loose_object_ids(&loose_ids, size_before,
1187 	    progress_cb, progress_arg, &rl, repo);
1188 	if (err)
1189 		return err;
1190 	*nloose = got_object_idset_num_elements(loose_ids);
1191 	if (*nloose == 0) {
1192 		got_object_idset_free(loose_ids);
1193 		if (progress_cb) {
1194 			err = progress_cb(progress_arg, 0, 0, 0, -1);
1195 			if (err)
1196 				return err;
1197 		}
1198 		return NULL;
1199 	}
1200 
1201 	traversed_ids = got_object_idset_alloc();
1202 	if (traversed_ids == NULL) {
1203 		err = got_error_from_errno("got_object_idset_alloc");
1204 		goto done;
1205 	}
1206 
1207 	err = got_ref_list(&refs, repo, "", got_ref_cmp_by_name, NULL);
1208 	if (err)
1209 		goto done;
1210 	if (!ignore_mtime) {
1211 		TAILQ_FOREACH(re, &refs, entry) {
1212 			time_t mtime = got_ref_get_mtime(re->ref);
1213 			if (mtime > max_mtime)
1214 				max_mtime = mtime;
1215 		}
1216 		/*
1217 		 * For safety, keep objects created within 10 minutes
1218 		 * before the youngest reference was created.
1219 		 */
1220 		if (max_mtime >= 600)
1221 			max_mtime -= 600;
1222 	}
1223 
1224 	err = get_reflist_object_ids(&referenced_ids, &nreferenced,
1225 	    (1 << GOT_OBJ_TYPE_COMMIT) | (1 << GOT_OBJ_TYPE_TAG),
1226 	    &refs, repo, cancel_cb, cancel_arg);
1227 	if (err)
1228 		goto done;
1229 
1230 	for (i = 0; i < nreferenced; i++) {
1231 		struct got_object_id *id = referenced_ids[i];
1232 		err = load_commit_or_tag(loose_ids, ncommits, npacked,
1233 		    traversed_ids, id, repo, progress_cb, progress_arg, &rl,
1234 		    *nloose, cancel_cb, cancel_arg);
1235 		if (err)
1236 			goto done;
1237 	}
1238 
1239 	/* Any remaining loose objects are unreferenced and can be purged. */
1240 	arg.repo = repo;
1241 	arg.progress_arg = progress_arg;
1242 	arg.progress_cb = progress_cb;
1243 	arg.rl = &rl;
1244 	arg.nloose = *nloose;
1245 	arg.npurged = 0;
1246 	arg.size_purged = 0;
1247 	arg.ncommits = *ncommits;
1248 	arg.dry_run = dry_run;
1249 	arg.max_mtime = max_mtime;
1250 	arg.ignore_mtime = ignore_mtime;
1251 	err = got_object_idset_for_each(loose_ids, purge_loose_object, &arg);
1252 	if (err)
1253 		goto done;
1254 	*size_after = *size_before - arg.size_purged;
1255 
1256 	/* Produce a final progress report. */
1257 	if (progress_cb) {
1258 		err = progress_cb(progress_arg, *nloose, *ncommits, arg.npurged,
1259 		    -1);
1260 		if (err)
1261 			goto done;
1262 	}
1263 done:
1264 	got_object_idset_free(loose_ids);
1265 	got_object_idset_free(traversed_ids);
1266 	return err;
1267 }
1268 
1269 static const struct got_error *
1270 purge_redundant_pack(struct got_repository *repo, const char *packidx_path,
1271     int dry_run, int *remove, off_t *size_before, off_t *size_after)
1272 {
1273 	static const char *ext[] = {".idx", ".pack", ".rev", ".bitmap",
1274 	    ".promisor", ".mtimes"};
1275 	struct stat sb;
1276 	char *dot, path[PATH_MAX];
1277 	size_t i;
1278 
1279 	if (strlcpy(path, packidx_path, sizeof(path)) >=
1280 	    sizeof(path))
1281 		return got_error(GOT_ERR_NO_SPACE);
1282 
1283 	/*
1284 	 * For compatibility with Git, if a matching .keep file exist
1285 	 * don't delete the packfile.
1286 	 */
1287 	dot = strrchr(path, '.');
1288 	*dot = '\0';
1289 	if (strlcat(path, ".keep", sizeof(path)) >= sizeof(path))
1290 		return got_error(GOT_ERR_NO_SPACE);
1291 	if (faccessat(got_repo_get_fd(repo), path, F_OK, 0) == 0)
1292 		*remove = 0;
1293 
1294 	for (i = 0; i < nitems(ext); ++i) {
1295 		*dot = '\0';
1296 
1297 		if (strlcat(path, ext[i], sizeof(path)) >=
1298 		    sizeof(path))
1299 			return got_error(GOT_ERR_NO_SPACE);
1300 
1301 		if (fstatat(got_repo_get_fd(repo), path, &sb, 0) ==
1302 		    -1) {
1303 			if (errno == ENOENT &&
1304 			    strcmp(ext[i], ".pack") != 0 &&
1305 			    strcmp(ext[i], ".idx") != 0)
1306 				continue;
1307 			return got_error_from_errno2("fstatat", path);
1308 		}
1309 
1310 		*size_before += sb.st_size;
1311 		if (!*remove) {
1312 			*size_after += sb.st_size;
1313 			continue;
1314 		}
1315 
1316 		if (dry_run)
1317 			continue;
1318 
1319 		if (unlinkat(got_repo_get_fd(repo), path, 0) == -1) {
1320 			if (errno == ENOENT)
1321 				continue;
1322 			return got_error_from_errno2("unlinkat",
1323 			    path);
1324 		}
1325 	}
1326 
1327 	return NULL;
1328 }
1329 
1330 static const struct got_error *
1331 pack_is_redundant(int *redundant, struct got_repository *repo,
1332     const char *packidx_path, struct got_object_idset *idset)
1333 {
1334 	const struct got_error *err;
1335 	struct got_packidx *packidx;
1336 	struct got_packidx_object_id *pid;
1337 	struct got_object_id id;
1338 	size_t i, nobjects;
1339 
1340 	*redundant = 1;
1341 
1342 	err = got_repo_get_packidx(&packidx, packidx_path, repo);
1343 	if (err)
1344 		return err;
1345 
1346 	nobjects = be32toh(packidx->hdr.fanout_table[0xff]);
1347 	for (i = 0; i < nobjects; ++i) {
1348 		pid = &packidx->hdr.sorted_ids[i];
1349 
1350 		memset(&id, 0, sizeof(id));
1351 		memcpy(&id.sha1, pid->sha1, sizeof(id.sha1));
1352 
1353 		if (got_object_idset_contains(idset, &id))
1354 			continue;
1355 
1356 		*redundant = 0;
1357 		err = got_object_idset_add(idset, &id, NULL);
1358 		if (err)
1359 			return err;
1360 	}
1361 
1362 	return NULL;
1363 }
1364 
1365 struct pack_info {
1366 	const char	*path;
1367 	size_t		 nobjects;
1368 };
1369 
1370 static int
1371 pack_info_cmp(const void *a, const void *b)
1372 {
1373 	const struct pack_info	*pa, *pb;
1374 
1375 	pa = a;
1376 	pb = b;
1377 	if (pa->nobjects == pb->nobjects)
1378 		return strcmp(pa->path, pb->path);
1379 	if (pa->nobjects > pb->nobjects)
1380 		return -1;
1381 	return 1;
1382 }
1383 
1384 const struct got_error *
1385 got_repo_purge_redundant_packfiles(struct got_repository *repo,
1386     off_t *size_before, off_t *size_after, int dry_run,
1387     int nloose, int ncommits, int npurged,
1388     got_cleanup_progress_cb progress_cb, void *progress_arg,
1389     got_cancel_cb cancel_cb, void *cancel_arg)
1390 {
1391 	const struct got_error *err;
1392 	struct pack_info *pinfo, *sorted = NULL;
1393 	struct got_packidx *packidx;
1394 	struct got_object_idset *idset = NULL;
1395 	struct got_pathlist_entry *pe;
1396 	size_t i, npacks;
1397 	int remove, redundant_packs = 0;
1398 	struct got_ratelimit rl;
1399 
1400 	got_ratelimit_init(&rl, 0, 500);
1401 
1402 	*size_before = 0;
1403 	*size_after = 0;
1404 
1405 	npacks = 0;
1406 	TAILQ_FOREACH(pe, &repo->packidx_paths, entry)
1407 		npacks++;
1408 
1409 	if (npacks == 0)
1410 		return NULL;
1411 
1412 	sorted = calloc(npacks, sizeof(*sorted));
1413 	if (sorted == NULL)
1414 		return got_error_from_errno("calloc");
1415 
1416 	i = 0;
1417 	TAILQ_FOREACH(pe, &repo->packidx_paths, entry) {
1418 		err = got_repo_get_packidx(&packidx, pe->path, repo);
1419 		if (err)
1420 			goto done;
1421 
1422 		pinfo = &sorted[i++];
1423 		pinfo->path = pe->path;
1424 		pinfo->nobjects = be32toh(packidx->hdr.fanout_table[0xff]);
1425 	}
1426 	qsort(sorted, npacks, sizeof(*sorted), pack_info_cmp);
1427 
1428 	idset = got_object_idset_alloc();
1429 	if (idset == NULL) {
1430 		err = got_error_from_errno("got_object_idset_alloc");
1431 		goto done;
1432 	}
1433 
1434 	for (i = 0; i < npacks; ++i) {
1435 		if (cancel_cb) {
1436 			err = (*cancel_cb)(cancel_arg);
1437 			if (err)
1438 				break;
1439 		}
1440 
1441 		err = pack_is_redundant(&remove, repo, sorted[i].path, idset);
1442 		if (err)
1443 			goto done;
1444 		err = purge_redundant_pack(repo, sorted[i].path, dry_run,
1445 		    &remove, size_before, size_after);
1446 		if (err)
1447 			goto done;
1448 		if (!remove)
1449 			continue;
1450 		err = report_cleanup_progress(progress_cb, progress_arg,
1451 		    &rl, nloose, ncommits, npurged, ++redundant_packs);
1452 		if (err)
1453 			goto done;
1454 	}
1455 
1456 	/* Produce a final progress report. */
1457 	if (progress_cb) {
1458 		err = progress_cb(progress_arg, nloose, ncommits, npurged,
1459 		    redundant_packs);
1460 		if (err)
1461 			goto done;
1462 	}
1463  done:
1464 	free(sorted);
1465 	if (idset)
1466 		got_object_idset_free(idset);
1467 	return err;
1468 }
1469 
1470 const struct got_error *
1471 got_repo_remove_lonely_packidx(struct got_repository *repo, int dry_run,
1472     got_lonely_packidx_progress_cb progress_cb, void *progress_arg,
1473     got_cancel_cb cancel_cb, void *cancel_arg)
1474 {
1475 	const struct got_error *err = NULL;
1476 	DIR *packdir = NULL;
1477 	struct dirent *dent;
1478 	char *pack_relpath = NULL;
1479 	int packdir_fd;
1480 	struct stat sb;
1481 
1482 	packdir_fd = openat(got_repo_get_fd(repo),
1483 	    GOT_OBJECTS_PACK_DIR, O_DIRECTORY | O_CLOEXEC);
1484 	if (packdir_fd == -1) {
1485 		if (errno == ENOENT)
1486 			return NULL;
1487 		return got_error_from_errno_fmt("openat: %s/%s",
1488 		    got_repo_get_path_git_dir(repo),
1489 		    GOT_OBJECTS_PACK_DIR);
1490 	}
1491 
1492 	packdir = fdopendir(packdir_fd);
1493 	if (packdir == NULL) {
1494 		err = got_error_from_errno("fdopendir");
1495 		goto done;
1496 	}
1497 
1498 	while ((dent = readdir(packdir)) != NULL) {
1499 		if (cancel_cb) {
1500 			err = cancel_cb(cancel_arg);
1501 			if (err)
1502 				goto done;
1503 		}
1504 
1505 		if (!got_repo_is_packidx_filename(dent->d_name, dent->d_namlen))
1506 			continue;
1507 
1508 		err = got_packidx_get_packfile_path(&pack_relpath,
1509 		    dent->d_name);
1510 		if (err)
1511 			goto done;
1512 
1513 		if (fstatat(packdir_fd, pack_relpath, &sb, 0) != -1) {
1514 			free(pack_relpath);
1515 			pack_relpath = NULL;
1516 			continue;
1517 		}
1518 		if (errno != ENOENT) {
1519 			err = got_error_from_errno_fmt("fstatat: %s/%s/%s",
1520 			    got_repo_get_path_git_dir(repo),
1521 			    GOT_OBJECTS_PACK_DIR,
1522 			    pack_relpath);
1523 			goto done;
1524 		}
1525 
1526 		if (!dry_run) {
1527 			if (unlinkat(packdir_fd, dent->d_name, 0) == -1) {
1528 				err = got_error_from_errno("unlinkat");
1529 				goto done;
1530 			}
1531 		}
1532 		if (progress_cb) {
1533 			char *path;
1534 			if (asprintf(&path, "%s/%s/%s",
1535 			    got_repo_get_path_git_dir(repo),
1536 			    GOT_OBJECTS_PACK_DIR,
1537 			    dent->d_name) == -1) {
1538 				err = got_error_from_errno("asprintf");
1539 				goto done;
1540 			}
1541 			err = progress_cb(progress_arg, path);
1542 			free(path);
1543 			if (err)
1544 				goto done;
1545 		}
1546 		free(pack_relpath);
1547 		pack_relpath = NULL;
1548 	}
1549 done:
1550 	if (packdir && closedir(packdir) != 0 && err == NULL)
1551 		err = got_error_from_errno("closedir");
1552 	free(pack_relpath);
1553 	return err;
1554 }