1 /*
2  * Copyright (c) 2020 Ori Bernstein
3  * Copyright (c) 2021 Stefan Sperling <stsp@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/uio.h>
20 #include <sys/stat.h>
21 #include <sys/time.h>
22 
23 #include <stdint.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <time.h>
28 #include <unistd.h>
29 #include <limits.h>
30 #include <zlib.h>
31 
32 #if defined(__FreeBSD__)
33 #include <unistd.h>
34 #endif
35 
36 #include "got_error.h"
37 #include "got_cancel.h"
38 #include "got_object.h"
39 #include "got_path.h"
40 #include "got_reference.h"
41 #include "got_repository_admin.h"
42 #include "got_opentemp.h"
43 
44 #include "got_lib_deltify.h"
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_deflate.h"
50 #include "got_lib_pack.h"
51 #include "got_lib_privsep.h"
52 #include "got_lib_repository.h"
53 #include "got_lib_ratelimit.h"
54 #include "got_lib_inflate.h"
55 
56 #ifndef MIN
57 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
58 #endif
59 
60 #ifndef MAX
61 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
62 #endif
63 
64 #ifndef nitems
65 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
66 #endif
67 
68 struct got_pack_meta {
69 	struct got_object_id id;
70 	char	*path;
71 	int	obj_type;
72 	off_t	size;
73 	time_t	mtime;
74 
75 	/* The best delta we picked */
76 	struct got_pack_meta *head;
77 	struct got_pack_meta *prev;
78 	unsigned char *delta_buf; /* if encoded in memory (compressed) */
79 	off_t	delta_offset;	/* offset in delta cache file (compressed) */
80 	off_t	delta_len;	/* encoded delta length */
81 	off_t	delta_compressed_len; /* encoded+compressed delta length */
82 	int	nchain;
83 
84 	int	have_reused_delta;
85 	off_t   reused_delta_offset; /* offset of delta in reused pack file */
86 	struct got_object_id *base_obj_id;
87 
88 	/* Only used for delta window */
89 	struct got_delta_table *dtab;
90 
91 	/* Only used for writing offset deltas */
92 	off_t	off;
93 };
94 
95 struct got_pack_metavec {
96 	struct got_pack_meta **meta;
97 	int nmeta;
98 	int metasz;
99 };
100 
101 static const struct got_error *
102 alloc_meta(struct got_pack_meta **new, struct got_object_id *id,
103     const char *path, int obj_type, time_t mtime)
104 {
105 	const struct got_error *err = NULL;
106 	struct got_pack_meta *m;
107 
108 	*new = NULL;
109 
110 	m = calloc(1, sizeof(*m));
111 	if (m == NULL)
112 		return got_error_from_errno("calloc");
113 
114 	memcpy(&m->id, id, sizeof(m->id));
115 
116 	m->path = strdup(path);
117 	if (m->path == NULL) {
118 		err = got_error_from_errno("strdup");
119 		free(m);
120 		return err;
121 	}
122 
123 	m->obj_type = obj_type;
124 	m->mtime = mtime;
125 	*new = m;
126 	return NULL;
127 }
128 
129 static void
130 clear_meta(struct got_pack_meta *meta)
131 {
132 	if (meta == NULL)
133 		return;
134 	free(meta->path);
135 	meta->path = NULL;
136 	free(meta->delta_buf);
137 	meta->delta_buf = NULL;
138 	free(meta->base_obj_id);
139 	meta->base_obj_id = NULL;
140 }
141 
142 static void
143 free_nmeta(struct got_pack_meta **meta, int nmeta)
144 {
145 	int i;
146 
147 	for (i = 0; i < nmeta; i++)
148 		clear_meta(meta[i]);
149 	free(meta);
150 }
151 
152 static int
153 delta_order_cmp(const void *pa, const void *pb)
154 {
155 	struct got_pack_meta *a, *b;
156 	int cmp;
157 
158 	a = *(struct got_pack_meta **)pa;
159 	b = *(struct got_pack_meta **)pb;
160 
161 	if (a->obj_type != b->obj_type)
162 		return a->obj_type - b->obj_type;
163 	cmp = strcmp(a->path, b->path);
164 	if (cmp != 0)
165 		return cmp;
166 	if (a->mtime < b->mtime)
167 		return -1;
168 	if (a->mtime > b->mtime)
169 		return 1;
170 	return got_object_id_cmp(&a->id, &b->id);
171 }
172 
173 static off_t
174 delta_size(struct got_delta_instruction *deltas, int ndeltas)
175 {
176 	int i;
177 	off_t size = 32;
178 	for (i = 0; i < ndeltas; i++) {
179 		if (deltas[i].copy)
180 			size += GOT_DELTA_SIZE_SHIFT;
181 		else
182 			size += deltas[i].len + 1;
183 	}
184 	return size;
185 }
186 
187 static const struct got_error *
188 append(unsigned char **p, size_t *len, off_t *sz, void *seg, int nseg)
189 {
190 	char *n;
191 
192 	if (*len + nseg >= *sz) {
193 		while (*len + nseg >= *sz)
194 			*sz += *sz / 2;
195 		n = realloc(*p, *sz);
196 		if (n == NULL)
197 			return got_error_from_errno("realloc");
198 		*p = n;
199 	}
200 	memcpy(*p + *len, seg, nseg);
201 	*len += nseg;
202 	return NULL;
203 }
204 
205 static const struct got_error *
206 encode_delta_in_mem(struct got_pack_meta *m, struct got_raw_object *o,
207     struct got_delta_instruction *deltas, int ndeltas,
208     off_t delta_size, off_t base_size)
209 {
210 	const struct got_error *err;
211 	unsigned char buf[16], *bp;
212 	int i, j;
213 	size_t len = 0, compressed_len;
214 	off_t bufsize = delta_size;
215 	off_t n;
216 	struct got_delta_instruction *d;
217 	uint8_t *delta_buf;
218 
219 	delta_buf = malloc(bufsize);
220 	if (delta_buf == NULL)
221 		return got_error_from_errno("malloc");
222 
223 	/* base object size */
224 	buf[0] = base_size & GOT_DELTA_SIZE_VAL_MASK;
225 	n = base_size >> GOT_DELTA_SIZE_SHIFT;
226 	for (i = 1; n > 0; i++) {
227 		buf[i - 1] |= GOT_DELTA_SIZE_MORE;
228 		buf[i] = n & GOT_DELTA_SIZE_VAL_MASK;
229 		n >>= GOT_DELTA_SIZE_SHIFT;
230 	}
231 	err = append(&delta_buf, &len, &bufsize, buf, i);
232 	if (err)
233 		goto done;
234 
235 	/* target object size */
236 	buf[0] = o->size & GOT_DELTA_SIZE_VAL_MASK;
237 	n = o->size >> GOT_DELTA_SIZE_SHIFT;
238 	for (i = 1; n > 0; i++) {
239 		buf[i - 1] |= GOT_DELTA_SIZE_MORE;
240 		buf[i] = n & GOT_DELTA_SIZE_VAL_MASK;
241 		n >>= GOT_DELTA_SIZE_SHIFT;
242 	}
243 	err = append(&delta_buf, &len, &bufsize, buf, i);
244 	if (err)
245 		goto done;
246 
247 	for (j = 0; j < ndeltas; j++) {
248 		d = &deltas[j];
249 		if (d->copy) {
250 			n = d->offset;
251 			bp = &buf[1];
252 			buf[0] = GOT_DELTA_BASE_COPY;
253 			for (i = 0; i < 4; i++) {
254 				/* DELTA_COPY_OFF1 ... DELTA_COPY_OFF4 */
255 				buf[0] |= 1 << i;
256 				*bp++ = n & 0xff;
257 				n >>= 8;
258 				if (n == 0)
259 					break;
260 			}
261 
262 			n = d->len;
263 			if (n != GOT_DELTA_COPY_DEFAULT_LEN) {
264 				/* DELTA_COPY_LEN1 ... DELTA_COPY_LEN3 */
265 				for (i = 0; i < 3 && n > 0; i++) {
266 					buf[0] |= 1 << (i + 4);
267 					*bp++ = n & 0xff;
268 					n >>= 8;
269 				}
270 			}
271 			err = append(&delta_buf, &len, &bufsize,
272 			    buf, bp - buf);
273 			if (err)
274 				goto done;
275 		} else if (o->f == NULL) {
276 			n = 0;
277 			while (n != d->len) {
278 				buf[0] = (d->len - n < 127) ? d->len - n : 127;
279 				err = append(&delta_buf, &len, &bufsize,
280 				    buf, 1);
281 				if (err)
282 					goto done;
283 				err = append(&delta_buf, &len, &bufsize,
284 				    o->data + o->hdrlen + d->offset + n,
285 				    buf[0]);
286 				if (err)
287 					goto done;
288 				n += buf[0];
289 			}
290 		} else {
291 			char content[128];
292 			size_t r;
293 			if (fseeko(o->f, o->hdrlen + d->offset, SEEK_SET) == -1) {
294 				err = got_error_from_errno("fseeko");
295 				goto done;
296 			}
297 			n = 0;
298 			while (n != d->len) {
299 				buf[0] = (d->len - n < 127) ? d->len - n : 127;
300 				err = append(&delta_buf, &len, &bufsize,
301 				    buf, 1);
302 				if (err)
303 					goto done;
304 				r = fread(content, 1, buf[0], o->f);
305 				if (r != buf[0]) {
306 					err = got_ferror(o->f, GOT_ERR_IO);
307 					goto done;
308 				}
309 				err = append(&delta_buf, &len, &bufsize,
310 				    content, buf[0]);
311 				if (err)
312 					goto done;
313 				n += buf[0];
314 			}
315 		}
316 	}
317 
318 	err = got_deflate_to_mem_mmap(&m->delta_buf, &compressed_len,
319 	    NULL, NULL, delta_buf, 0, len);
320 	if (err)
321 		goto done;
322 
323 	m->delta_len = len;
324 	m->delta_compressed_len = compressed_len;
325 done:
326 	free(delta_buf);
327 	return err;
328 }
329 
330 static const struct got_error *
331 encode_delta(struct got_pack_meta *m, struct got_raw_object *o,
332     struct got_delta_instruction *deltas, int ndeltas,
333     off_t base_size, FILE *f)
334 {
335 	const struct got_error *err;
336 	unsigned char buf[16], *bp;
337 	int i, j;
338 	off_t n;
339 	struct got_deflate_buf zb;
340 	struct got_delta_instruction *d;
341 	off_t delta_len = 0, compressed_len = 0;
342 
343 	err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
344 	if (err)
345 		return err;
346 
347 	/* base object size */
348 	buf[0] = base_size & GOT_DELTA_SIZE_VAL_MASK;
349 	n = base_size >> GOT_DELTA_SIZE_SHIFT;
350 	for (i = 1; n > 0; i++) {
351 		buf[i - 1] |= GOT_DELTA_SIZE_MORE;
352 		buf[i] = n & GOT_DELTA_SIZE_VAL_MASK;
353 		n >>= GOT_DELTA_SIZE_SHIFT;
354 	}
355 
356 	err = got_deflate_append_to_file_mmap(&zb, &compressed_len,
357 	    buf, 0, i, f, NULL);
358 	if (err)
359 		goto done;
360 	delta_len += i;
361 
362 	/* target object size */
363 	buf[0] = o->size & GOT_DELTA_SIZE_VAL_MASK;
364 	n = o->size >> GOT_DELTA_SIZE_SHIFT;
365 	for (i = 1; n > 0; i++) {
366 		buf[i - 1] |= GOT_DELTA_SIZE_MORE;
367 		buf[i] = n & GOT_DELTA_SIZE_VAL_MASK;
368 		n >>= GOT_DELTA_SIZE_SHIFT;
369 	}
370 
371 	err = got_deflate_append_to_file_mmap(&zb, &compressed_len,
372 	    buf, 0, i, f, NULL);
373 	if (err)
374 		goto done;
375 	delta_len += i;
376 
377 	for (j = 0; j < ndeltas; j++) {
378 		d = &deltas[j];
379 		if (d->copy) {
380 			n = d->offset;
381 			bp = &buf[1];
382 			buf[0] = GOT_DELTA_BASE_COPY;
383 			for (i = 0; i < 4; i++) {
384 				/* DELTA_COPY_OFF1 ... DELTA_COPY_OFF4 */
385 				buf[0] |= 1 << i;
386 				*bp++ = n & 0xff;
387 				n >>= 8;
388 				if (n == 0)
389 					break;
390 			}
391 			n = d->len;
392 			if (n != GOT_DELTA_COPY_DEFAULT_LEN) {
393 				/* DELTA_COPY_LEN1 ... DELTA_COPY_LEN3 */
394 				for (i = 0; i < 3 && n > 0; i++) {
395 					buf[0] |= 1 << (i + 4);
396 					*bp++ = n & 0xff;
397 					n >>= 8;
398 				}
399 			}
400 			err = got_deflate_append_to_file_mmap(&zb,
401 			    &compressed_len, buf, 0, bp - buf, f, NULL);
402 			if (err)
403 				goto done;
404 			delta_len += (bp - buf);
405 		} else if (o->f == NULL) {
406 			n = 0;
407 			while (n != d->len) {
408 				buf[0] = (d->len - n < 127) ? d->len - n : 127;
409 				err = got_deflate_append_to_file_mmap(&zb,
410 				    &compressed_len, buf, 0, 1, f, NULL);
411 				if (err)
412 					goto done;
413 				delta_len++;
414 				err = got_deflate_append_to_file_mmap(&zb,
415 				    &compressed_len,
416 				    o->data + o->hdrlen + d->offset + n, 0,
417 				    buf[0], f, NULL);
418 				if (err)
419 					goto done;
420 				delta_len += buf[0];
421 				n += buf[0];
422 			}
423 		} else {
424 			char content[128];
425 			size_t r;
426 			if (fseeko(o->f, o->hdrlen + d->offset, SEEK_SET) == -1) {
427 				err = got_error_from_errno("fseeko");
428 				goto done;
429 			}
430 			n = 0;
431 			while (n != d->len) {
432 				buf[0] = (d->len - n < 127) ? d->len - n : 127;
433 				err = got_deflate_append_to_file_mmap(&zb,
434 				    &compressed_len, buf, 0, 1, f, NULL);
435 				if (err)
436 					goto done;
437 				delta_len++;
438 				r = fread(content, 1, buf[0], o->f);
439 				if (r != buf[0]) {
440 					err = got_ferror(o->f, GOT_ERR_IO);
441 					goto done;
442 				}
443 				err = got_deflate_append_to_file_mmap(&zb,
444 				    &compressed_len, content, 0, buf[0], f,
445 				    NULL);
446 				if (err)
447 					goto done;
448 				delta_len += buf[0];
449 				n += buf[0];
450 			}
451 		}
452 	}
453 
454 	err = got_deflate_flush(&zb, f, NULL, &compressed_len);
455 	if (err)
456 		goto done;
457 
458 	/* sanity check */
459 	if (compressed_len != ftello(f) - m->delta_offset) {
460 		err = got_error(GOT_ERR_COMPRESSION);
461 		goto done;
462 	}
463 
464 	m->delta_len = delta_len;
465 	m->delta_compressed_len = compressed_len;
466 done:
467 	got_deflate_end(&zb);
468 	return err;
469 }
470 
471 static const struct got_error *
472 report_progress(got_pack_progress_cb progress_cb, void *progress_arg,
473     struct got_ratelimit *rl, int ncolored, int nfound, int ntrees,
474     off_t packfile_size, int ncommits, int nobj_total, int obj_deltify,
475     int nobj_written)
476 {
477 	const struct got_error *err;
478 	int elapsed;
479 
480 	if (progress_cb == NULL)
481 		return NULL;
482 
483 	err = got_ratelimit_check(&elapsed, rl);
484 	if (err || !elapsed)
485 		return err;
486 
487 	return progress_cb(progress_arg, ncolored, nfound, ntrees,
488 	    packfile_size, ncommits, nobj_total, obj_deltify, nobj_written);
489 }
490 
491 static const struct got_error *
492 add_meta(struct got_pack_meta *m, struct got_pack_metavec *v)
493 {
494 	if (v->nmeta == v->metasz){
495 		size_t newsize = 2 * v->metasz;
496 		struct got_pack_meta **new;
497 		new = reallocarray(v->meta, newsize, sizeof(*new));
498 		if (new == NULL)
499 			return got_error_from_errno("reallocarray");
500 		v->meta = new;
501 		v->metasz = newsize; 
502 	}
503 
504 	v->meta[v->nmeta++] = m;
505 	return NULL;
506 }
507 
508 static const struct got_error *
509 reuse_delta(int idx, struct got_pack_meta *m, struct got_pack_metavec *v,
510     struct got_object_idset *idset, struct got_pack *pack,
511     struct got_packidx *packidx, int delta_cache_fd,
512     struct got_repository *repo)
513 {
514 	const struct got_error *err = NULL;
515 	struct got_pack_meta *base = NULL;
516 	struct got_object_id *base_obj_id = NULL;
517 	off_t delta_len = 0, delta_compressed_len = 0;
518 	off_t delta_offset = 0, delta_cache_offset = 0;
519 	uint64_t base_size, result_size;
520 
521 	if (m->have_reused_delta)
522 		return NULL;
523 
524 	err = got_object_read_raw_delta(&base_size, &result_size, &delta_len,
525 	    &delta_compressed_len, &delta_offset, &delta_cache_offset,
526 	    &base_obj_id, delta_cache_fd, packidx, idx, &m->id, repo);
527 	if (err)
528 		return err;
529 
530 	if (delta_offset + delta_len < delta_offset)
531 		return got_error(GOT_ERR_BAD_PACKFILE);
532 
533 	base = got_object_idset_get(idset, base_obj_id);
534 	if (base == NULL)
535 		goto done;
536 
537 	m->delta_len = delta_len;
538 	m->delta_compressed_len = delta_compressed_len;
539 	m->delta_offset = delta_cache_offset;
540 	m->prev = base;
541 	m->size = result_size;
542 	m->have_reused_delta = 1;
543 	m->reused_delta_offset = delta_offset;
544 	m->base_obj_id = base_obj_id;
545 	base_obj_id = NULL;
546 	err = add_meta(m, v);
547 done:
548 	free(base_obj_id);
549 	return err;
550 }
551 
552 static const struct got_error *
553 find_pack_for_reuse(struct got_packidx **best_packidx,
554     struct got_repository *repo)
555 {
556 	const struct got_error *err = NULL;
557 	struct got_pathlist_entry *pe;
558 	const char *best_packidx_path = NULL;
559 	int nobj_max = 0;
560 
561 	*best_packidx = NULL;
562 
563 	TAILQ_FOREACH(pe, &repo->packidx_paths, entry) {
564 		const char *path_packidx = pe->path;
565 		struct got_packidx *packidx;
566 		int nobj;
567 
568 		err = got_repo_get_packidx(&packidx, path_packidx, repo);
569 		if (err)
570 			break;
571 
572 		nobj = be32toh(packidx->hdr.fanout_table[0xff]);
573 		if (nobj > nobj_max) {
574 			best_packidx_path = path_packidx;
575 			nobj_max = nobj;
576 		}
577 	}
578 
579 	if (best_packidx_path) {
580 		err = got_repo_get_packidx(best_packidx, best_packidx_path,
581 		    repo);
582 	}
583 
584 	return err;
585 }
586 
587 struct search_deltas_arg {
588 	struct got_packidx *packidx;
589 	struct got_pack *pack;
590 	struct got_object_idset *idset;
591 	struct got_pack_metavec *v;
592 	int delta_cache_fd;
593 	struct got_repository *repo;
594 	got_pack_progress_cb progress_cb;
595 	void *progress_arg;
596 	struct got_ratelimit *rl;
597 	got_cancel_cb cancel_cb;
598 	void *cancel_arg;
599 	int ncolored;
600 	int nfound;
601 	int ntrees;
602 	int ncommits;
603 };
604 
605 static const struct got_error *
606 search_delta_for_object(struct got_object_id *id, void *data, void *arg)
607 {
608 	const struct got_error *err;
609 	struct got_pack_meta *m = data;
610 	struct search_deltas_arg *a = arg;
611 	int obj_idx;
612 	struct got_object *obj = NULL;
613 
614 	if (a->cancel_cb) {
615 		err = (*a->cancel_cb)(a->cancel_arg);
616 		if (err)
617 			return err;
618 	}
619 
620 	if (!got_repo_check_packidx_bloom_filter(a->repo,
621 	    a->packidx->path_packidx, id))
622 		return NULL;
623 
624 	obj_idx = got_packidx_get_object_idx(a->packidx, id);
625 	if (obj_idx == -1)
626 		return NULL;
627 
628 	/* TODO:
629 	 * Opening and closing an object just to check its flags
630 	 * is a bit expensive. We could have an imsg which requests
631 	 * plain type/size information for an object without doing
632 	 * work such as traversing the object's entire delta chain
633 	 * to find the base object type, and other such info which
634 	 * we don't really need here.
635 	 */
636 	err = got_object_open_from_packfile(&obj, &m->id, a->pack,
637 	    a->packidx, obj_idx, a->repo);
638 	if (err)
639 		return err;
640 
641 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
642 		reuse_delta(obj_idx, m, a->v, a->idset, a->pack, a->packidx,
643 		    a->delta_cache_fd, a->repo);
644 		if (err)
645 			goto done;
646 		err = report_progress(a->progress_cb, a->progress_arg, a->rl,
647 		    a->ncolored, a->nfound, a->ntrees, 0L, a->ncommits,
648 		    got_object_idset_num_elements(a->idset), a->v->nmeta, 0);
649 	}
650 done:
651 	got_object_close(obj);
652 	return err;
653 }
654 
655 static const struct got_error *
656 search_deltas(struct got_pack_metavec *v, struct got_object_idset *idset,
657     int delta_cache_fd, int ncolored, int nfound, int ntrees, int ncommits,
658     struct got_repository *repo,
659     got_pack_progress_cb progress_cb, void *progress_arg,
660     struct got_ratelimit *rl, got_cancel_cb cancel_cb, void *cancel_arg)
661 {
662 	const struct got_error *err = NULL;
663 	char *path_packfile = NULL;
664 	struct got_packidx *packidx;
665 	struct got_pack *pack;
666 	struct search_deltas_arg sda;
667 
668 	err = find_pack_for_reuse(&packidx, repo);
669 	if (err)
670 		return err;
671 
672 	if (packidx == NULL)
673 		return NULL;
674 
675 	err = got_packidx_get_packfile_path(&path_packfile,
676 	    packidx->path_packidx);
677 	if (err)
678 		return err;
679 
680 	pack = got_repo_get_cached_pack(repo, path_packfile);
681 	if (pack == NULL) {
682 		err = got_repo_cache_pack(&pack, repo, path_packfile, packidx);
683 		if (err)
684 			goto done;
685 	}
686 
687 	sda.packidx = packidx;
688 	sda.pack = pack;
689 	sda.idset = idset;
690 	sda.v = v;
691 	sda.delta_cache_fd = delta_cache_fd;
692 	sda.repo = repo;
693 	sda.progress_cb = progress_cb;
694 	sda.progress_arg = progress_arg;
695 	sda.rl = rl;
696 	sda.cancel_cb = cancel_cb;
697 	sda.cancel_arg = cancel_arg;
698 	sda.ncolored = ncolored;
699 	sda.nfound = nfound;
700 	sda.ntrees = ntrees;
701 	sda.ncommits = ncommits;
702 	err = got_object_idset_for_each(idset, search_delta_for_object, &sda);
703 done:
704 	free(path_packfile);
705 	return err;
706 }
707 
708 static const struct got_error *
709 pick_deltas(struct got_pack_meta **meta, int nmeta, int ncolored,
710     int nfound, int ntrees, int ncommits, int nreused, FILE *delta_cache,
711     struct got_repository *repo,
712     got_pack_progress_cb progress_cb, void *progress_arg,
713     struct got_ratelimit *rl, got_cancel_cb cancel_cb, void *cancel_arg)
714 {
715 	const struct got_error *err = NULL;
716 	struct got_pack_meta *m = NULL, *base = NULL;
717 	struct got_raw_object *raw = NULL, *base_raw = NULL;
718 	struct got_delta_instruction *deltas = NULL, *best_deltas = NULL;
719 	int i, j, ndeltas, best_ndeltas;
720 	off_t size, best_size;
721 	const int max_base_candidates = 3;
722 	size_t delta_memsize = 0;
723 	const size_t max_delta_memsize = 25 * GOT_DELTA_RESULT_SIZE_CACHED_MAX;
724 	int outfd = -1;
725 
726 	qsort(meta, nmeta, sizeof(struct got_pack_meta *), delta_order_cmp);
727 	for (i = 0; i < nmeta; i++) {
728 		if (cancel_cb) {
729 			err = (*cancel_cb)(cancel_arg);
730 			if (err)
731 				break;
732 		}
733 		err = report_progress(progress_cb, progress_arg, rl,
734 		    ncolored, nfound, ntrees, 0L, ncommits, nreused + nmeta,
735 		    nreused + i, 0);
736 		if (err)
737 			goto done;
738 		m = meta[i];
739 
740 		if (m->obj_type == GOT_OBJ_TYPE_COMMIT ||
741 		    m->obj_type == GOT_OBJ_TYPE_TAG)
742 			continue;
743 
744 		err = got_object_raw_open(&raw, &outfd, repo, &m->id);
745 		if (err)
746 			goto done;
747 		m->size = raw->size;
748 
749 		if (raw->f == NULL) {
750 			err = got_deltify_init_mem(&m->dtab, raw->data,
751 			    raw->hdrlen, raw->size + raw->hdrlen);
752 		} else {
753 			err = got_deltify_init(&m->dtab, raw->f, raw->hdrlen,
754 			    raw->size + raw->hdrlen);
755 		}
756 		if (err)
757 			goto done;
758 
759 		if (i > max_base_candidates) {
760 			struct got_pack_meta *n = NULL;
761 			n = meta[i - (max_base_candidates + 1)];
762 			got_deltify_free(n->dtab);
763 			n->dtab = NULL;
764 		}
765 
766 		best_size = raw->size;
767 		best_ndeltas = 0;
768 		for (j = MAX(0, i - max_base_candidates); j < i; j++) {
769 			if (cancel_cb) {
770 				err = (*cancel_cb)(cancel_arg);
771 				if (err)
772 					goto done;
773 			}
774 			base = meta[j];
775 			/* long chains make unpacking slow, avoid such bases */
776 			if (base->nchain >= 128 ||
777 			    base->obj_type != m->obj_type)
778 				continue;
779 
780 			err = got_object_raw_open(&base_raw, &outfd, repo,
781 			    &base->id);
782 			if (err)
783 				goto done;
784 
785 			if (raw->f == NULL && base_raw->f == NULL) {
786 				err = got_deltify_mem_mem(&deltas, &ndeltas,
787 				    raw->data, raw->hdrlen,
788 				    raw->size + raw->hdrlen,
789 				    base->dtab, base_raw->data,
790 				    base_raw->hdrlen,
791 				    base_raw->size + base_raw->hdrlen);
792 			} else if (raw->f == NULL) {
793 				err = got_deltify_mem_file(&deltas, &ndeltas,
794 				    raw->data, raw->hdrlen,
795 				    raw->size + raw->hdrlen,
796 				    base->dtab, base_raw->f,
797 				    base_raw->hdrlen,
798 				    base_raw->size + base_raw->hdrlen);
799 			} else if (base_raw->f == NULL) {
800 				err = got_deltify_file_mem(&deltas, &ndeltas,
801 				    raw->f, raw->hdrlen,
802 				    raw->size + raw->hdrlen,
803 				    base->dtab, base_raw->data,
804 				    base_raw->hdrlen,
805 				    base_raw->size + base_raw->hdrlen);
806 			} else {
807 				err = got_deltify(&deltas, &ndeltas,
808 				    raw->f, raw->hdrlen,
809 				    raw->size + raw->hdrlen,
810 				    base->dtab, base_raw->f, base_raw->hdrlen,
811 				    base_raw->size + base_raw->hdrlen);
812 			}
813 			got_object_raw_close(base_raw);
814 			base_raw = NULL;
815 			if (err)
816 				goto done;
817 
818 			size = delta_size(deltas, ndeltas);
819 			if (size + 32 < best_size){
820 				/*
821 				 * if we already picked a best delta,
822 				 * replace it.
823 				 */
824 				best_size = size;
825 				free(best_deltas);
826 				best_deltas = deltas;
827 				best_ndeltas = ndeltas;
828 				deltas = NULL;
829 				m->nchain = base->nchain + 1;
830 				m->prev = base;
831 				m->head = base->head;
832 				if (m->head == NULL)
833 					m->head = base;
834 			} else {
835 				free(deltas);
836 				deltas = NULL;
837 				ndeltas = 0;
838 			}
839 		}
840 
841 		if (best_ndeltas > 0) {
842 			if (best_size <= GOT_DELTA_RESULT_SIZE_CACHED_MAX &&
843 			    delta_memsize + best_size <= max_delta_memsize) {
844 				delta_memsize += best_size;
845 				err = encode_delta_in_mem(m, raw, best_deltas,
846 				    best_ndeltas, best_size, m->prev->size);
847 			} else {
848 				m->delta_offset = ftello(delta_cache);
849 				err = encode_delta(m, raw, best_deltas,
850 				    best_ndeltas, m->prev->size, delta_cache);
851 			}
852 			free(best_deltas);
853 			best_deltas = NULL;
854 			best_ndeltas = 0;
855 			if (err)
856 				goto done;
857 		}
858 
859 		got_object_raw_close(raw);
860 		raw = NULL;
861 	}
862 done:
863 	for (i = MAX(0, nmeta - max_base_candidates); i < nmeta; i++) {
864 		got_deltify_free(meta[i]->dtab);
865 		meta[i]->dtab = NULL;
866 	}
867 	if (raw)
868 		got_object_raw_close(raw);
869 	if (base_raw)
870 		got_object_raw_close(base_raw);
871 	if (outfd != -1 && close(outfd) == -1 && err == NULL)
872 		err = got_error_from_errno("close");
873 	free(deltas);
874 	free(best_deltas);
875 	return err;
876 }
877 
878 static const struct got_error *
879 search_packidx(int *found, struct got_object_id *id,
880     struct got_repository *repo)
881 {
882 	const struct got_error *err = NULL;
883 	struct got_packidx *packidx = NULL;
884 	int idx;
885 
886 	*found = 0;
887 
888 	err = got_repo_search_packidx(&packidx, &idx, repo, id);
889 	if (err == NULL)
890 		*found = 1; /* object is already packed */
891 	else if (err->code == GOT_ERR_NO_OBJ)
892 		err = NULL;
893 	return err;
894 }
895 
896 static const struct got_error *
897 add_object(int want_meta, struct got_object_idset *idset,
898     struct got_object_id *id, const char *path, int obj_type,
899     time_t mtime, int loose_obj_only, struct got_repository *repo,
900     int *ncolored, int *nfound, int *ntrees,
901     got_pack_progress_cb progress_cb, void *progress_arg,
902     struct got_ratelimit *rl)
903 {
904 	const struct got_error *err;
905 	struct got_pack_meta *m = NULL;
906 
907 	if (loose_obj_only) {
908 		int is_packed;
909 		err = search_packidx(&is_packed, id, repo);
910 		if (err)
911 			return err;
912 		if (is_packed && want_meta)
913 			return NULL;
914 	}
915 
916 	if (want_meta) {
917 		err = alloc_meta(&m, id, path, obj_type, mtime);
918 		if (err)
919 			return err;
920 
921 		(*nfound)++;
922 		err = report_progress(progress_cb, progress_arg, rl,
923 		    *ncolored, *nfound, *ntrees, 0L, 0, 0, 0, 0);
924 		if (err) {
925 			clear_meta(m);
926 			free(m);
927 			return err;
928 		}
929 	}
930 
931 	err = got_object_idset_add(idset, id, m);
932 	if (err) {
933 		clear_meta(m);
934 		free(m);
935 	}
936 	return err;
937 }
938 
939 static const struct got_error *
940 load_tree_entries(struct got_object_id_queue *ids, int want_meta,
941     struct got_object_idset *idset, struct got_object_id *tree_id,
942     const char *dpath, time_t mtime, struct got_repository *repo,
943     int loose_obj_only, int *ncolored, int *nfound, int *ntrees,
944     got_pack_progress_cb progress_cb, void *progress_arg,
945     struct got_ratelimit *rl, got_cancel_cb cancel_cb, void *cancel_arg)
946 {
947 	const struct got_error *err;
948 	struct got_tree_object *tree;
949 	char *p = NULL;
950 	int i;
951 
952 	err = got_object_open_as_tree(&tree, repo, tree_id);
953 	if (err)
954 		return err;
955 
956 	(*ntrees)++;
957 	err = report_progress(progress_cb, progress_arg, rl,
958 	    *ncolored, *nfound, *ntrees, 0L, 0, 0, 0, 0);
959 	if (err)
960 		return err;
961 
962 	for (i = 0; i < got_object_tree_get_nentries(tree); i++) {
963 		struct got_tree_entry *e = got_object_tree_get_entry(tree, i);
964 		struct got_object_id *id = got_tree_entry_get_id(e);
965 		mode_t mode = got_tree_entry_get_mode(e);
966 
967 		if (cancel_cb) {
968 			err = (*cancel_cb)(cancel_arg);
969 			if (err)
970 				break;
971 		}
972 
973 		if (got_object_tree_entry_is_submodule(e) ||
974 		    got_object_idset_contains(idset, id))
975 			continue;
976 		
977 		if (asprintf(&p, "%s%s%s", dpath, dpath[0] != '\0' ? "/" : "",
978 		    got_tree_entry_get_name(e)) == -1) {
979 			err = got_error_from_errno("asprintf");
980 			break;
981 		}
982 
983 		if (S_ISDIR(mode)) {
984 			struct got_object_qid *qid;
985 			err = got_object_qid_alloc(&qid, id);
986 			if (err)
987 				break;
988 			STAILQ_INSERT_TAIL(ids, qid, entry);
989 		} else if (S_ISREG(mode) || S_ISLNK(mode)) {
990 			err = add_object(want_meta, idset, id, p,
991 			    GOT_OBJ_TYPE_BLOB, mtime, loose_obj_only, repo,
992 			    ncolored, nfound, ntrees,
993 			    progress_cb, progress_arg, rl);
994 			if (err)
995 				break;
996 		}
997 		free(p);
998 		p = NULL;
999 	}
1000 
1001 	got_object_tree_close(tree);
1002 	free(p);
1003 	return err;
1004 }
1005 
1006 static const struct got_error *
1007 load_tree(int want_meta, struct got_object_idset *idset,
1008     struct got_object_id *tree_id, const char *dpath, time_t mtime,
1009     struct got_repository *repo, int loose_obj_only,
1010     int *ncolored, int *nfound, int *ntrees,
1011     got_pack_progress_cb progress_cb, void *progress_arg,
1012     struct got_ratelimit *rl, got_cancel_cb cancel_cb, void *cancel_arg)
1013 {
1014 	const struct got_error *err = NULL;
1015 	struct got_object_id_queue tree_ids;
1016 	struct got_object_qid *qid;
1017 
1018 	if (got_object_idset_contains(idset, tree_id))
1019 		return NULL;
1020 
1021 	err = got_object_qid_alloc(&qid, tree_id);
1022 	if (err)
1023 		return err;
1024 
1025 	STAILQ_INIT(&tree_ids);
1026 	STAILQ_INSERT_TAIL(&tree_ids, qid, entry);
1027 
1028 	while (!STAILQ_EMPTY(&tree_ids)) {
1029 		if (cancel_cb) {
1030 			err = (*cancel_cb)(cancel_arg);
1031 			if (err)
1032 				break;
1033 		}
1034 
1035 		qid = STAILQ_FIRST(&tree_ids);
1036 		STAILQ_REMOVE_HEAD(&tree_ids, entry);
1037 
1038 		if (got_object_idset_contains(idset, &qid->id)) {
1039 			got_object_qid_free(qid);
1040 			continue;
1041 		}
1042 
1043 		err = add_object(want_meta, idset, &qid->id, dpath,
1044 		    GOT_OBJ_TYPE_TREE, mtime, loose_obj_only, repo,
1045 		    ncolored, nfound, ntrees, progress_cb, progress_arg, rl);
1046 		if (err) {
1047 			got_object_qid_free(qid);
1048 			break;
1049 		}
1050 
1051 		err = load_tree_entries(&tree_ids, want_meta, idset, &qid->id,
1052 		    dpath, mtime, repo, loose_obj_only, ncolored, nfound,
1053 		    ntrees, progress_cb, progress_arg, rl,
1054 		    cancel_cb, cancel_arg);
1055 		got_object_qid_free(qid);
1056 		if (err)
1057 			break;
1058 	}
1059 
1060 	got_object_id_queue_free(&tree_ids);
1061 	return err;
1062 }
1063 
1064 static const struct got_error *
1065 load_commit(int want_meta, struct got_object_idset *idset,
1066     struct got_object_id *id, struct got_repository *repo, int loose_obj_only,
1067     int *ncolored, int *nfound, int *ntrees,
1068     got_pack_progress_cb progress_cb, void *progress_arg,
1069     struct got_ratelimit *rl, got_cancel_cb cancel_cb, void *cancel_arg)
1070 {
1071 	const struct got_error *err;
1072 	struct got_commit_object *commit;
1073 
1074 	if (got_object_idset_contains(idset, id))
1075 		return NULL;
1076 
1077 	if (loose_obj_only) {
1078 		int is_packed;
1079 		err = search_packidx(&is_packed, id, repo);
1080 		if (err)
1081 			return err;
1082 		if (is_packed && want_meta)
1083 			return NULL;
1084 	}
1085 
1086 	err = got_object_open_as_commit(&commit, repo, id);
1087 	if (err)
1088 		return err;
1089 
1090 	err = add_object(want_meta, idset, id, "", GOT_OBJ_TYPE_COMMIT,
1091 	    got_object_commit_get_committer_time(commit),
1092 	    loose_obj_only, repo,
1093 	    ncolored, nfound, ntrees, progress_cb, progress_arg, rl);
1094 	if (err)
1095 		goto done;
1096 
1097 	err = load_tree(want_meta, idset, got_object_commit_get_tree_id(commit),
1098 	    "", got_object_commit_get_committer_time(commit),
1099 	    repo, loose_obj_only, ncolored, nfound, ntrees,
1100 	    progress_cb, progress_arg, rl, cancel_cb, cancel_arg);
1101 done:
1102 	got_object_commit_close(commit);
1103 	return err;
1104 }
1105 
1106 static const struct got_error *
1107 load_tag(int want_meta, struct got_object_idset *idset,
1108     struct got_object_id *id, struct got_repository *repo, int loose_obj_only,
1109     int *ncolored, int *nfound, int *ntrees,
1110     got_pack_progress_cb progress_cb, void *progress_arg,
1111     struct got_ratelimit *rl, got_cancel_cb cancel_cb, void *cancel_arg)
1112 {
1113 	const struct got_error *err;
1114 	struct got_tag_object *tag = NULL;
1115 
1116 	if (got_object_idset_contains(idset, id))
1117 		return NULL;
1118 
1119 	if (loose_obj_only) {
1120 		int is_packed;
1121 		err = search_packidx(&is_packed, id, repo);
1122 		if (err)
1123 			return err;
1124 		if (is_packed && want_meta)
1125 			return NULL;
1126 	}
1127 
1128 	err = got_object_open_as_tag(&tag, repo, id);
1129 	if (err)
1130 		return err;
1131 
1132 	err = add_object(want_meta, idset, id, "", GOT_OBJ_TYPE_TAG,
1133 	    got_object_tag_get_tagger_time(tag), loose_obj_only, repo,
1134 	    ncolored, nfound, ntrees, progress_cb, progress_arg, rl);
1135 	if (err)
1136 		goto done;
1137 
1138 	switch (got_object_tag_get_object_type(tag)) {
1139 	case GOT_OBJ_TYPE_COMMIT:
1140 		err = load_commit(want_meta, idset,
1141 		    got_object_tag_get_object_id(tag), repo, loose_obj_only,
1142 		    ncolored, nfound, ntrees, progress_cb, progress_arg, rl,
1143 		    cancel_cb, cancel_arg);
1144 		break;
1145 	case GOT_OBJ_TYPE_TREE:
1146 		err = load_tree(want_meta, idset,
1147 		    got_object_tag_get_object_id(tag), "",
1148 		    got_object_tag_get_tagger_time(tag), repo, loose_obj_only,
1149 		    ncolored, nfound, ntrees, progress_cb, progress_arg, rl,
1150 		    cancel_cb, cancel_arg);
1151 		break;
1152 	default:
1153 		break;
1154 	}
1155 
1156 done:
1157 	got_object_tag_close(tag);
1158 	return err;
1159 }
1160 
1161 enum findtwixt_color {
1162 	COLOR_KEEP = 0,
1163 	COLOR_DROP,
1164 	COLOR_BLANK,
1165 	COLOR_SKIP,
1166 };
1167 
1168 static const int findtwixt_colors[] = {
1169 	COLOR_KEEP,
1170 	COLOR_DROP,
1171 	COLOR_BLANK,
1172 	COLOR_SKIP,
1173 };
1174 
1175 static const struct got_error *
1176 paint_commit(struct got_object_qid *qid, int color)
1177 {
1178 	if (color < 0 || color >= nitems(findtwixt_colors))
1179 		return got_error(GOT_ERR_RANGE);
1180 
1181 	qid->data = (void *)&findtwixt_colors[color];
1182 	return NULL;
1183 }
1184 
1185 static const struct got_error *
1186 queue_commit_id(struct got_object_id_queue *ids, struct got_object_id *id,
1187     int color, struct got_repository *repo)
1188 {
1189 	const struct got_error *err;
1190 	struct got_object_qid *qid;
1191 
1192 	err = got_object_qid_alloc(&qid, id);
1193 	if (err)
1194 		return err;
1195 
1196 	STAILQ_INSERT_TAIL(ids, qid, entry);
1197 	return paint_commit(qid, color);
1198 }
1199 
1200 struct append_id_arg {
1201 	struct got_object_id **array;
1202 	int idx;
1203 	struct got_object_idset *drop;
1204 	struct got_object_idset *skip;
1205 };
1206 
1207 static const struct got_error *
1208 append_id(struct got_object_id *id, void *data, void *arg)
1209 {
1210 	struct append_id_arg *a = arg;
1211 
1212 	if (got_object_idset_contains(a->skip, id) ||
1213 	    got_object_idset_contains(a->drop, id))
1214 		return NULL;
1215 
1216 	a->array[++a->idx] = got_object_id_dup(id);
1217 	if (a->array[a->idx] == NULL)
1218 		return got_error_from_errno("got_object_id_dup");
1219 
1220 	return NULL;
1221 }
1222 
1223 static const struct got_error *
1224 queue_commit_or_tag_id(struct got_object_id *id, int color,
1225     struct got_object_id_queue *ids, struct got_repository *repo)
1226 {
1227 	const struct got_error *err;
1228 	struct got_tag_object *tag = NULL;
1229 	int obj_type;
1230 
1231 	err = got_object_get_type(&obj_type, repo, id);
1232 	if (err)
1233 		return err;
1234 
1235 	if (obj_type == GOT_OBJ_TYPE_TAG) {
1236 		err = got_object_open_as_tag(&tag, repo, id);
1237 		if (err)
1238 			return err;
1239 		obj_type = got_object_tag_get_object_type(tag);
1240 		id = got_object_tag_get_object_id(tag);
1241 	}
1242 
1243 	if (obj_type == GOT_OBJ_TYPE_COMMIT) {
1244 		err = queue_commit_id(ids, id, color, repo);
1245 		if (err)
1246 			goto done;
1247 	}
1248 done:
1249 	if (tag)
1250 		got_object_tag_close(tag);
1251 	return err;
1252 }
1253 
1254 static const struct got_error *
1255 paint_commits(int *ncolored, struct got_object_id_queue *ids, int nids,
1256     struct got_object_idset *keep, struct got_object_idset *drop,
1257     struct got_object_idset *skip, struct got_repository *repo,
1258     got_pack_progress_cb progress_cb, void *progress_arg,
1259     struct got_ratelimit *rl, got_cancel_cb cancel_cb, void *cancel_arg)
1260 {
1261 	const struct got_error *err = NULL;
1262 	struct got_commit_object *commit = NULL;
1263 	const struct got_object_id_queue *parents;
1264 	struct got_object_qid *qid;
1265 	int nqueued = nids, nskip = 0;
1266 
1267 	while (!STAILQ_EMPTY(ids) && nskip != nqueued) {
1268 		int color;
1269 
1270 		if (cancel_cb) {
1271 			err = cancel_cb(cancel_arg);
1272 			if (err)
1273 				break;
1274 		}
1275 
1276 		qid = STAILQ_FIRST(ids);
1277 		STAILQ_REMOVE_HEAD(ids, entry);
1278 		nqueued--;
1279 		color = *((int *)qid->data);
1280 		if (color == COLOR_SKIP)
1281 			nskip--;
1282 
1283 		if (got_object_idset_contains(skip, &qid->id)) {
1284 			got_object_qid_free(qid);
1285 			continue;
1286 		}
1287 
1288 		switch (color) {
1289 		case COLOR_KEEP:
1290 			if (got_object_idset_contains(keep, &qid->id)) {
1291 				got_object_qid_free(qid);
1292 				continue;
1293 			}
1294 			if (got_object_idset_contains(drop, &qid->id)) {
1295 				err = paint_commit(qid, COLOR_SKIP);
1296 				if (err)
1297 					goto done;
1298 				nskip++;
1299 			} else
1300 				(*ncolored)++;
1301 			err = got_object_idset_add(keep, &qid->id, NULL);
1302 			if (err)
1303 				goto done;
1304 			break;
1305 		case COLOR_DROP:
1306 			if (got_object_idset_contains(drop, &qid->id)) {
1307 				got_object_qid_free(qid);
1308 				continue;
1309 			}
1310 			if (got_object_idset_contains(keep, &qid->id)) {
1311 				err = paint_commit(qid, COLOR_SKIP);
1312 				if (err)
1313 					goto done;
1314 				nskip++;
1315 			} else
1316 				(*ncolored)++;
1317 			err = got_object_idset_add(drop, &qid->id, NULL);
1318 			if (err)
1319 				goto done;
1320 			break;
1321 		case COLOR_SKIP:
1322 			if (!got_object_idset_contains(skip, &qid->id)) {
1323 				err = got_object_idset_add(skip, &qid->id,
1324 				    NULL);
1325 				if (err)
1326 					goto done;
1327 			}
1328 			break;
1329 		default:
1330 			/* should not happen */
1331 			err = got_error_fmt(GOT_ERR_NOT_IMPL,
1332 			    "%s invalid commit color %d", __func__, color);
1333 			goto done;
1334 		}
1335 
1336 		err = report_progress(progress_cb, progress_arg, rl,
1337 		    *ncolored, 0, 0, 0L, 0, 0, 0, 0);
1338 		if (err)
1339 			break;
1340 
1341 
1342 		err = got_object_open_as_commit(&commit, repo, &qid->id);
1343 		if (err)
1344 			break;
1345 
1346 		parents = got_object_commit_get_parent_ids(commit);
1347 		if (parents) {
1348 			struct got_object_qid *pid;
1349 			color = *((int *)qid->data);
1350 			STAILQ_FOREACH(pid, parents, entry) {
1351 				err = queue_commit_id(ids, &pid->id, color,
1352 				    repo);
1353 				if (err)
1354 					break;
1355 				nqueued++;
1356 				if (color == COLOR_SKIP)
1357 					nskip++;
1358 			}
1359 		}
1360 
1361 		got_object_commit_close(commit);
1362 		commit = NULL;
1363 		got_object_qid_free(qid);
1364 	}
1365 done:
1366 	if (commit)
1367 		got_object_commit_close(commit);
1368 	return err;
1369 }
1370 
1371 static const struct got_error *
1372 findtwixt(struct got_object_id ***res, int *nres, int *ncolored,
1373     struct got_object_id **head, int nhead,
1374     struct got_object_id **tail, int ntail,
1375     struct got_repository *repo,
1376     got_pack_progress_cb progress_cb, void *progress_arg,
1377     struct got_ratelimit *rl, got_cancel_cb cancel_cb, void *cancel_arg)
1378 {
1379 	const struct got_error *err = NULL;
1380 	struct got_object_id_queue ids;
1381 	struct got_object_idset *keep, *drop, *skip = NULL;
1382 	int i, nkeep;
1383 
1384 	STAILQ_INIT(&ids);
1385 	*res = NULL;
1386 	*nres = 0;
1387 	*ncolored = 0;
1388 
1389 	keep = got_object_idset_alloc();
1390 	if (keep == NULL)
1391 		return got_error_from_errno("got_object_idset_alloc");
1392 
1393 	drop = got_object_idset_alloc();
1394 	if (drop == NULL) {
1395 		err = got_error_from_errno("got_object_idset_alloc");
1396 		goto done;
1397 	}
1398 
1399 	skip = got_object_idset_alloc();
1400 	if (skip == NULL) {
1401 		err = got_error_from_errno("got_object_idset_alloc");
1402 		goto done;
1403 	}
1404 
1405 	for (i = 0; i < nhead; i++) {
1406 		struct got_object_id *id = head[i];
1407 		if (id == NULL)
1408 			continue;
1409 		err = queue_commit_or_tag_id(id, COLOR_KEEP, &ids, repo);
1410 		if (err)
1411 			goto done;
1412 	}		
1413 
1414 	for (i = 0; i < ntail; i++) {
1415 		struct got_object_id *id = tail[i];
1416 		if (id == NULL)
1417 			continue;
1418 		err = queue_commit_or_tag_id(id, COLOR_DROP, &ids, repo);
1419 		if (err)
1420 			goto done;
1421 	}
1422 
1423 	err = paint_commits(ncolored, &ids, nhead + ntail,
1424 	    keep, drop, skip, repo, progress_cb, progress_arg, rl,
1425 	    cancel_cb, cancel_arg);
1426 	if (err)
1427 		goto done;
1428 
1429 	nkeep = got_object_idset_num_elements(keep);
1430 	if (nkeep > 0) {
1431 		struct append_id_arg arg;
1432 		arg.array = calloc(nkeep, sizeof(struct got_object_id *));
1433 		if (arg.array == NULL) {
1434 			err = got_error_from_errno("calloc");
1435 			goto done;
1436 		}
1437 		arg.idx = -1;
1438 		arg.skip = skip;
1439 		arg.drop = drop;
1440 		err = got_object_idset_for_each(keep, append_id, &arg);
1441 		if (err) {
1442 			free(arg.array);
1443 			goto done;
1444 		}
1445 		*res = arg.array;
1446 		*nres = arg.idx + 1;
1447 	}
1448 done:
1449 	got_object_idset_free(keep);
1450 	got_object_idset_free(drop);
1451 	if (skip)
1452 		got_object_idset_free(skip);
1453 	got_object_id_queue_free(&ids);
1454 	return err;
1455 }
1456 
1457 static const struct got_error *
1458 load_object_ids(int *ncolored, int *nfound, int *ntrees,
1459     struct got_object_idset *idset, struct got_object_id **theirs, int ntheirs,
1460     struct got_object_id **ours, int nours, struct got_repository *repo,
1461     int loose_obj_only, got_pack_progress_cb progress_cb, void *progress_arg,
1462     struct got_ratelimit *rl, got_cancel_cb cancel_cb, void *cancel_arg)
1463 {
1464 	const struct got_error *err = NULL;
1465 	struct got_object_id **ids = NULL;
1466 	int i, nobj = 0, obj_type;
1467 
1468 	*ncolored = 0;
1469 	*nfound = 0;
1470 	*ntrees = 0;
1471 
1472 	err = findtwixt(&ids, &nobj, ncolored, ours, nours, theirs, ntheirs,
1473 	    repo, progress_cb, progress_arg, rl, cancel_cb, cancel_arg);
1474 	if (err || nobj == 0)
1475 		goto done;
1476 
1477 	for (i = 0; i < ntheirs; i++) {
1478 		struct got_object_id *id = theirs[i];
1479 		if (id == NULL)
1480 			continue;
1481 		err = got_object_get_type(&obj_type, repo, id);
1482 		if (err)
1483 			return err;
1484 		if (obj_type == GOT_OBJ_TYPE_COMMIT) {
1485 			err = load_commit(0, idset, id, repo,
1486 			    loose_obj_only, ncolored, nfound, ntrees,
1487 			    progress_cb, progress_arg, rl,
1488 			    cancel_cb, cancel_arg);
1489 			if (err)
1490 				goto done;
1491 		} else if (obj_type == GOT_OBJ_TYPE_TAG) {
1492 			err = load_tag(0, idset, id, repo,
1493 			    loose_obj_only, ncolored, nfound, ntrees,
1494 			    progress_cb, progress_arg, rl,
1495 			    cancel_cb, cancel_arg);
1496 			if (err)
1497 				goto done;
1498 		}
1499 	}
1500 
1501 	for (i = 0; i < nobj; i++) {
1502 		err = load_commit(1, idset, ids[i], repo, loose_obj_only,
1503 		    ncolored, nfound, ntrees, progress_cb, progress_arg, rl,
1504 		    cancel_cb, cancel_arg);
1505 		if (err)
1506 			goto done;
1507 	}
1508 
1509 	for (i = 0; i < nours; i++) {
1510 		struct got_object_id *id = ours[i];
1511 		struct got_pack_meta *m;
1512 		if (id == NULL)
1513 			continue;
1514 		m = got_object_idset_get(idset, id);
1515 		if (m == NULL) {
1516 			err = got_object_get_type(&obj_type, repo, id);
1517 			if (err)
1518 				goto done;
1519 		} else
1520 			obj_type = m->obj_type;
1521 		if (obj_type != GOT_OBJ_TYPE_TAG)
1522 			continue;
1523 		err = load_tag(1, idset, id, repo, loose_obj_only,
1524 		    ncolored, nfound, ntrees, progress_cb, progress_arg, rl,
1525 		    cancel_cb, cancel_arg);
1526 		if (err)
1527 			goto done;
1528 	}
1529 done:
1530 	for (i = 0; i < nobj; i++) {
1531 		free(ids[i]);
1532 	}
1533 	free(ids);
1534 	return err;
1535 }
1536 
1537 const struct got_error *
1538 hwrite(FILE *f, void *buf, off_t len, SHA1_CTX *ctx)
1539 {
1540 	size_t n;
1541 
1542 	SHA1Update(ctx, buf, len);
1543 	n = fwrite(buf, 1, len, f);
1544 	if (n != len)
1545 		return got_ferror(f, GOT_ERR_IO);
1546 	return NULL;
1547 }
1548 
1549 const struct got_error *
1550 hcopy(FILE *fsrc, FILE *fdst, off_t len, SHA1_CTX *ctx)
1551 {
1552 	unsigned char buf[65536];
1553 	off_t remain = len;
1554 	size_t n;
1555 
1556 	while (remain > 0) {
1557 		size_t copylen = MIN(sizeof(buf), remain);
1558 		n = fread(buf, 1, copylen, fsrc);
1559 		if (n != copylen)
1560 			return got_ferror(fsrc, GOT_ERR_IO);
1561 		SHA1Update(ctx, buf, copylen);
1562 		n = fwrite(buf, 1, copylen, fdst);
1563 		if (n != copylen)
1564 			return got_ferror(fdst, GOT_ERR_IO);
1565 		remain -= copylen;
1566 	}
1567 
1568 	return NULL;
1569 }
1570 
1571 static void
1572 putbe32(char *b, uint32_t n)
1573 {
1574 	b[0] = n >> 24;
1575 	b[1] = n >> 16;
1576 	b[2] = n >> 8;
1577 	b[3] = n >> 0;
1578 }
1579 
1580 static int
1581 write_order_cmp(const void *pa, const void *pb)
1582 {
1583 	struct got_pack_meta *a, *b, *ahd, *bhd;
1584 
1585 	a = *(struct got_pack_meta **)pa;
1586 	b = *(struct got_pack_meta **)pb;
1587 	ahd = (a->head == NULL) ? a : a->head;
1588 	bhd = (b->head == NULL) ? b : b->head;
1589 	if (bhd->mtime < ahd->mtime)
1590 		return -1;
1591 	if (bhd->mtime > ahd->mtime)
1592 		return 1;
1593 	if (bhd < ahd)
1594 		return -1;
1595 	if (bhd > ahd)
1596 		return 1;
1597 	if (a->nchain != b->nchain)
1598 		return a->nchain - b->nchain;
1599 	if (a->mtime < b->mtime)
1600 		return -1;
1601 	if (a->mtime > b->mtime)
1602 		return 1;
1603 	return got_object_id_cmp(&a->id, &b->id);
1604 }
1605 
1606 static int
1607 reuse_write_order_cmp(const void *pa, const void *pb)
1608 {
1609 	struct got_pack_meta *a, *b;
1610 
1611 	a = *(struct got_pack_meta **)pa;
1612 	b = *(struct got_pack_meta **)pb;
1613 
1614 	if (a->reused_delta_offset < b->reused_delta_offset)
1615 		return -1;
1616 	if (a->reused_delta_offset > b->reused_delta_offset)
1617 		return 1;
1618 	return 0;
1619 }
1620 
1621 static const struct got_error *
1622 packhdr(int *hdrlen, char *hdr, size_t bufsize, int obj_type, size_t len)
1623 {
1624 	size_t i;
1625 
1626 	*hdrlen = 0;
1627 
1628 	hdr[0] = obj_type << 4;
1629 	hdr[0] |= len & 0xf;
1630 	len >>= 4;
1631 	for (i = 1; len != 0; i++){
1632 		if (i >= bufsize)
1633 			return got_error(GOT_ERR_NO_SPACE);
1634 		hdr[i - 1] |= GOT_DELTA_SIZE_MORE;
1635 		hdr[i] = len & GOT_DELTA_SIZE_VAL_MASK;
1636 		len >>= GOT_DELTA_SIZE_SHIFT;
1637 	}
1638 
1639 	*hdrlen = i;
1640 	return NULL;
1641 }
1642 
1643 static int
1644 packoff(char *hdr, off_t off)
1645 {
1646 	int i, j;
1647 	char rbuf[8];
1648 
1649 	rbuf[0] = off & GOT_DELTA_SIZE_VAL_MASK;
1650 	for (i = 1; (off >>= GOT_DELTA_SIZE_SHIFT) != 0; i++) {
1651 		rbuf[i] = (--off & GOT_DELTA_SIZE_VAL_MASK) |
1652 		    GOT_DELTA_SIZE_MORE;
1653 	}
1654 
1655 	j = 0;
1656 	while (i > 0)
1657 		hdr[j++] = rbuf[--i];
1658 	return j;
1659 }
1660 
1661 static const struct got_error *
1662 deltahdr(off_t *packfile_size, SHA1_CTX *ctx, FILE *packfile,
1663     struct got_pack_meta *m)
1664 {
1665 	const struct got_error *err;
1666 	char buf[32];
1667 	int nh;
1668 
1669 	if (m->prev->off != 0) {
1670 		err = packhdr(&nh, buf, sizeof(buf),
1671 		    GOT_OBJ_TYPE_OFFSET_DELTA, m->delta_len);
1672 		if (err)
1673 			return err;
1674 		nh += packoff(buf + nh, m->off - m->prev->off);
1675 		err = hwrite(packfile, buf, nh, ctx);
1676 		if (err)
1677 			return err;
1678 		*packfile_size += nh;
1679 	} else {
1680 		err = packhdr(&nh, buf, sizeof(buf),
1681 		    GOT_OBJ_TYPE_REF_DELTA, m->delta_len);
1682 		if (err)
1683 			return err;
1684 		err = hwrite(packfile, buf, nh, ctx);
1685 		if (err)
1686 			return err;
1687 		*packfile_size += nh;
1688 		err = hwrite(packfile, m->prev->id.sha1,
1689 		    sizeof(m->prev->id.sha1), ctx);
1690 		if (err)
1691 			return err;
1692 		*packfile_size += sizeof(m->prev->id.sha1);
1693 	}
1694 
1695 	return NULL;
1696 }
1697 
1698 static const struct got_error *
1699 write_packed_object(off_t *packfile_size, FILE *packfile,
1700     FILE *delta_cache, struct got_pack_meta *m, int *outfd,
1701     SHA1_CTX *ctx, struct got_repository *repo)
1702 {
1703 	const struct got_error *err = NULL;
1704 	struct got_deflate_checksum csum;
1705 	char buf[32];
1706 	int nh;
1707 	struct got_raw_object *raw = NULL;
1708 	off_t outlen;
1709 
1710 	csum.output_sha1 = ctx;
1711 	csum.output_crc = NULL;
1712 
1713 	m->off = ftello(packfile);
1714 	if (m->delta_len == 0) {
1715 		err = got_object_raw_open(&raw, outfd, repo, &m->id);
1716 		if (err)
1717 			goto done;
1718 		err = packhdr(&nh, buf, sizeof(buf),
1719 		    m->obj_type, raw->size);
1720 		if (err)
1721 			goto done;
1722 		err = hwrite(packfile, buf, nh, ctx);
1723 		if (err)
1724 			goto done;
1725 		*packfile_size += nh;
1726 		if (raw->f == NULL) {
1727 			err = got_deflate_to_file_mmap(&outlen,
1728 			    raw->data + raw->hdrlen, 0, raw->size,
1729 			    packfile, &csum);
1730 			if (err)
1731 				goto done;
1732 		} else {
1733 			if (fseeko(raw->f, raw->hdrlen, SEEK_SET)
1734 			    == -1) {
1735 				err = got_error_from_errno("fseeko");
1736 				goto done;
1737 			}
1738 			err = got_deflate_to_file(&outlen, raw->f,
1739 			    raw->size, packfile, &csum);
1740 			if (err)
1741 				goto done;
1742 		}
1743 		*packfile_size += outlen;
1744 		got_object_raw_close(raw);
1745 		raw = NULL;
1746 	} else if (m->delta_buf) {
1747 		err = deltahdr(packfile_size, ctx, packfile, m);
1748 		if (err)
1749 			goto done;
1750 		err = hwrite(packfile, m->delta_buf,
1751 		    m->delta_compressed_len, ctx);
1752 		if (err)
1753 			goto done;
1754 		*packfile_size += m->delta_compressed_len;
1755 		free(m->delta_buf);
1756 		m->delta_buf = NULL;
1757 	} else {
1758 		if (fseeko(delta_cache, m->delta_offset, SEEK_SET)
1759 		    == -1) {
1760 			err = got_error_from_errno("fseeko");
1761 			goto done;
1762 		}
1763 		err = deltahdr(packfile_size, ctx, packfile, m);
1764 		if (err)
1765 			goto done;
1766 		err = hcopy(delta_cache, packfile,
1767 		    m->delta_compressed_len, ctx);
1768 		if (err)
1769 			goto done;
1770 		*packfile_size += m->delta_compressed_len;
1771 	}
1772 done:
1773 	if (raw)
1774 		got_object_raw_close(raw);
1775 	return err;
1776 }
1777 
1778 static const struct got_error *
1779 genpack(uint8_t *pack_sha1, FILE *packfile, FILE *delta_cache,
1780     struct got_pack_meta **deltify, int ndeltify,
1781     struct got_pack_meta **reuse, int nreuse,
1782     int ncolored, int nfound, int ntrees, int nours,
1783     struct got_repository *repo,
1784     got_pack_progress_cb progress_cb, void *progress_arg,
1785     struct got_ratelimit *rl,
1786     got_cancel_cb cancel_cb, void *cancel_arg)
1787 {
1788 	const struct got_error *err = NULL;
1789 	int i;
1790 	SHA1_CTX ctx;
1791 	struct got_pack_meta *m;
1792 	char buf[32];
1793 	size_t n;
1794 	off_t packfile_size = 0;
1795 	int outfd = -1;
1796 
1797 	SHA1Init(&ctx);
1798 
1799 	err = hwrite(packfile, "PACK", 4, &ctx);
1800 	if (err)
1801 		return err;
1802 	putbe32(buf, GOT_PACKFILE_VERSION);
1803 	err = hwrite(packfile, buf, 4, &ctx);
1804 	if (err)
1805 		goto done;
1806 	putbe32(buf, ndeltify + nreuse);
1807 	err = hwrite(packfile, buf, 4, &ctx);
1808 	if (err)
1809 		goto done;
1810 
1811 	qsort(deltify, ndeltify, sizeof(struct got_pack_meta *),
1812 	    write_order_cmp);
1813 	for (i = 0; i < ndeltify; i++) {
1814 		err = report_progress(progress_cb, progress_arg, rl,
1815 		    ncolored, nfound, ntrees, packfile_size, nours,
1816 		    ndeltify + nreuse, ndeltify + nreuse, i);
1817 		if (err)
1818 			goto done;
1819 		m = deltify[i];
1820 		err = write_packed_object(&packfile_size, packfile,
1821 		    delta_cache, m, &outfd, &ctx, repo);
1822 		if (err)
1823 			goto done;
1824 	}
1825 
1826 	qsort(reuse, nreuse, sizeof(struct got_pack_meta *),
1827 	    reuse_write_order_cmp);
1828 	for (i = 0; i < nreuse; i++) {
1829 		err = report_progress(progress_cb, progress_arg, rl,
1830 		    ncolored, nfound, ntrees, packfile_size, nours,
1831 		    ndeltify + nreuse, ndeltify + nreuse, ndeltify + i);
1832 		if (err)
1833 			goto done;
1834 		m = reuse[i];
1835 		err = write_packed_object(&packfile_size, packfile,
1836 		    delta_cache, m, &outfd, &ctx, repo);
1837 		if (err)
1838 			goto done;
1839 	}
1840 
1841 	SHA1Final(pack_sha1, &ctx);
1842 	n = fwrite(pack_sha1, 1, SHA1_DIGEST_LENGTH, packfile);
1843 	if (n != SHA1_DIGEST_LENGTH)
1844 		err = got_ferror(packfile, GOT_ERR_IO);
1845 	packfile_size += SHA1_DIGEST_LENGTH;
1846 	packfile_size += sizeof(struct got_packfile_hdr);
1847 	if (progress_cb) {
1848 		err = progress_cb(progress_arg, ncolored, nfound, ntrees,
1849 		    packfile_size, nours, ndeltify + nreuse,
1850 		    ndeltify + nreuse, ndeltify + nreuse);
1851 		if (err)
1852 			goto done;
1853 	}
1854 done:
1855 	if (outfd != -1 && close(outfd) == -1 && err == NULL)
1856 		err = got_error_from_errno("close");
1857 	return err;
1858 }
1859 
1860 static const struct got_error *
1861 remove_unused_object(struct got_object_id *id, void *data, void *arg)
1862 {
1863 	struct got_object_idset *idset = arg;
1864 
1865 	if (data == NULL)
1866 		got_object_idset_remove(NULL, idset, id);
1867 
1868 	return NULL;
1869 }
1870 
1871 static const struct got_error *
1872 remove_reused_object(struct got_object_id *id, void *data, void *arg)
1873 {
1874 	struct got_object_idset *idset = arg;
1875 	struct got_pack_meta *m = data;
1876 
1877 	if (m->have_reused_delta)
1878 		got_object_idset_remove(NULL, idset, id);
1879 
1880 	return NULL;
1881 }
1882 
1883 static const struct got_error *
1884 add_meta_idset_cb(struct got_object_id *id, void *data, void *arg)
1885 {
1886 	struct got_pack_meta *m = data;
1887 	struct got_pack_metavec *v = arg;
1888 
1889 	return add_meta(m, v);
1890 }
1891 
1892 const struct got_error *
1893 got_pack_create(uint8_t *packsha1, FILE *packfile,
1894     struct got_object_id **theirs, int ntheirs,
1895     struct got_object_id **ours, int nours,
1896     struct got_repository *repo, int loose_obj_only, int allow_empty,
1897     got_pack_progress_cb progress_cb, void *progress_arg,
1898     got_cancel_cb cancel_cb, void *cancel_arg)
1899 {
1900 	const struct got_error *err;
1901 	int delta_cache_fd = -1;
1902 	FILE *delta_cache = NULL;
1903 	struct got_object_idset *idset;
1904 	struct got_ratelimit rl;
1905 	struct got_pack_metavec deltify, reuse;
1906 	int ncolored = 0, nfound = 0, ntrees = 0;
1907 
1908 	memset(&deltify, 0, sizeof(deltify));
1909 	memset(&reuse, 0, sizeof(reuse));
1910 
1911 	got_ratelimit_init(&rl, 0, 500);
1912 
1913 	idset = got_object_idset_alloc();
1914 	if (idset == NULL)
1915 		return got_error_from_errno("got_object_idset_alloc");
1916 
1917 	err = load_object_ids(&ncolored, &nfound, &ntrees, idset, theirs,
1918 	    ntheirs, ours, nours, repo, loose_obj_only,
1919 	    progress_cb, progress_arg, &rl, cancel_cb, cancel_arg);
1920 	if (err)
1921 		return err;
1922 
1923 	err = got_object_idset_for_each(idset, remove_unused_object, idset);
1924 	if (err)
1925 		goto done;
1926 
1927 	if (progress_cb) {
1928 		err = progress_cb(progress_arg, ncolored, nfound, ntrees,
1929 		    0L, nours, got_object_idset_num_elements(idset), 0, 0);
1930 		if (err)
1931 			goto done;
1932 	}
1933 
1934 	if (got_object_idset_num_elements(idset) == 0 && !allow_empty) {
1935 		err = got_error(GOT_ERR_CANNOT_PACK);
1936 		goto done;
1937 	}
1938 
1939 	delta_cache_fd = got_opentempfd();
1940 	if (delta_cache_fd == -1) {
1941 		err = got_error_from_errno("got_opentemp");
1942 		goto done;
1943 	}
1944 
1945 	reuse.metasz = 64;
1946 	reuse.meta = calloc(reuse.metasz,
1947 	    sizeof(struct got_pack_meta *));
1948 	if (reuse.meta == NULL) {
1949 		err = got_error_from_errno("calloc");
1950 		goto done;
1951 	}
1952 
1953 	err = search_deltas(&reuse, idset, delta_cache_fd, ncolored, nfound,
1954 	    ntrees, nours, repo, progress_cb, progress_arg, &rl,
1955 	    cancel_cb, cancel_arg);
1956 	if (err)
1957 		goto done;
1958 	if (reuse.nmeta > 0) {
1959 		err = got_object_idset_for_each(idset,
1960 		    remove_reused_object, idset);
1961 		if (err)
1962 			goto done;
1963 	}
1964 
1965 	delta_cache = fdopen(delta_cache_fd, "a+");
1966 	if (delta_cache == NULL) {
1967 		err = got_error_from_errno("fdopen");
1968 		goto done;
1969 	}
1970 	delta_cache_fd = -1;
1971 
1972 	if (fseeko(delta_cache, 0L, SEEK_END) == -1) {
1973 		err = got_error_from_errno("fseeko");
1974 		goto done;
1975 	}
1976 
1977 	deltify.meta = calloc(got_object_idset_num_elements(idset),
1978 	    sizeof(struct got_pack_meta *));
1979 	if (deltify.meta == NULL) {
1980 		err = got_error_from_errno("calloc");
1981 		goto done;
1982 	}
1983 	deltify.metasz = got_object_idset_num_elements(idset);
1984 
1985 	err = got_object_idset_for_each(idset, add_meta_idset_cb, &deltify);
1986 	if (err)
1987 		goto done;
1988 	if (deltify.nmeta > 0) {
1989 		err = pick_deltas(deltify.meta, deltify.nmeta, ncolored,
1990 		    nfound, ntrees, nours, reuse.nmeta, delta_cache, repo,
1991 		    progress_cb, progress_arg, &rl, cancel_cb, cancel_arg);
1992 		if (err)
1993 			goto done;
1994 	}
1995 
1996 	if (fflush(delta_cache) == EOF) {
1997 		err = got_error_from_errno("fflush");
1998 		goto done;
1999 	}
2000 	err = genpack(packsha1, packfile, delta_cache, deltify.meta,
2001 	    deltify.nmeta, reuse.meta, reuse.nmeta, ncolored, nfound, ntrees,
2002 	    nours, repo, progress_cb, progress_arg, &rl,
2003 	    cancel_cb, cancel_arg);
2004 	if (err)
2005 		goto done;
2006 done:
2007 	free_nmeta(deltify.meta, deltify.nmeta);
2008 	free_nmeta(reuse.meta, reuse.nmeta);
2009 	got_object_idset_free(idset);
2010 	if (delta_cache_fd != -1 && close(delta_cache_fd) == -1 && err == NULL)
2011 		err = got_error_from_errno("close");
2012 	if (delta_cache && fclose(delta_cache) == EOF && err == NULL)
2013 		err = got_error_from_errno("fclose");
2014 	return err;
2015 }