1 /*
2  * Copyright (c) 2018, 2019 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "got_compat.h"
18 
19 #include <sys/queue.h>
20 #include <sys/stat.h>
21 
22 #include <errno.h>
23 #include <dirent.h>
24 #include <fcntl.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <limits.h>
29 #include <unistd.h>
30 
31 #include "got_error.h"
32 #include "got_object.h"
33 #include "got_path.h"
34 
35 #include "got_lib_hash.h"
36 #include "got_lib_fileindex.h"
37 #include "got_lib_worktree.h"
38 
39 /* got_fileindex_entry flags */
40 #define GOT_FILEIDX_F_PATH_LEN		0x00000fff
41 #define GOT_FILEIDX_F_STAGE		0x0000f000
42 #define GOT_FILEIDX_F_STAGE_SHIFT	12
43 #define GOT_FILEIDX_F_NOT_FLUSHED	0x00010000
44 #define GOT_FILEIDX_F_NO_BLOB		0x00020000
45 #define GOT_FILEIDX_F_NO_COMMIT		0x00040000
46 #define GOT_FILEIDX_F_NO_FILE_ON_DISK	0x00080000
47 #define GOT_FILEIDX_F_REMOVE_ON_FLUSH	0x00100000
48 #define GOT_FILEIDX_F_SKIPPED		0x00200000
49 
50 struct got_fileindex {
51 	struct got_fileindex_tree entries;
52 	int nentries; /* Does not include entries marked for removal. */
53 #define GOT_FILEIDX_MAX_ENTRIES INT_MAX
54 };
55 
56 mode_t
57 got_fileindex_entry_perms_get(struct got_fileindex_entry *ie)
58 {
59 	return ((ie->mode & GOT_FILEIDX_MODE_PERMS) >>
60 	    GOT_FILEIDX_MODE_PERMS_SHIFT);
61 }
62 
63 static void
64 fileindex_entry_perms_set(struct got_fileindex_entry *ie, mode_t mode)
65 {
66 	ie->mode &= ~GOT_FILEIDX_MODE_PERMS;
67 	ie->mode |= ((mode << GOT_FILEIDX_MODE_PERMS_SHIFT) &
68 	    GOT_FILEIDX_MODE_PERMS);
69 }
70 
71 mode_t
72 got_fileindex_perms_to_st(struct got_fileindex_entry *ie)
73 {
74 	mode_t perms = got_fileindex_entry_perms_get(ie);
75 	int type = got_fileindex_entry_filetype_get(ie);
76 	uint32_t ftype;
77 
78 	if (type == GOT_FILEIDX_MODE_REGULAR_FILE ||
79 	    type == GOT_FILEIDX_MODE_BAD_SYMLINK)
80 		ftype = S_IFREG;
81 	else
82 		ftype = S_IFLNK;
83 
84 	return (ftype | (perms & (S_IRWXU | S_IRWXG | S_IRWXO)));
85 }
86 
87 const struct got_error *
88 got_fileindex_entry_update(struct got_fileindex_entry *ie,
89     int wt_fd, const char *ondisk_path, uint8_t *blob_sha1,
90     uint8_t *commit_sha1, int update_timestamps)
91 {
92 	struct stat sb;
93 
94 	if (fstatat(wt_fd, ondisk_path, &sb, AT_SYMLINK_NOFOLLOW) != 0) {
95 		if (!((ie->flags & GOT_FILEIDX_F_NO_FILE_ON_DISK) &&
96 		    errno == ENOENT))
97 			return got_error_from_errno2("fstatat", ondisk_path);
98 		sb.st_mode = GOT_DEFAULT_FILE_MODE;
99 	} else {
100 		if (sb.st_mode & S_IFDIR)
101 			return got_error_set_errno(EISDIR, ondisk_path);
102 		ie->flags &= ~GOT_FILEIDX_F_NO_FILE_ON_DISK;
103 	}
104 
105 	if ((ie->flags & GOT_FILEIDX_F_NO_FILE_ON_DISK) == 0) {
106 		if (update_timestamps) {
107 			ie->ctime_sec = sb.st_ctim.tv_sec;
108 			ie->ctime_nsec = sb.st_ctim.tv_nsec;
109 			ie->mtime_sec = sb.st_mtim.tv_sec;
110 			ie->mtime_nsec = sb.st_mtim.tv_nsec;
111 		}
112 		ie->uid = sb.st_uid;
113 		ie->gid = sb.st_gid;
114 		ie->size = (sb.st_size & 0xffffffff);
115 		if (S_ISLNK(sb.st_mode)) {
116 			got_fileindex_entry_filetype_set(ie,
117 			    GOT_FILEIDX_MODE_SYMLINK);
118 			fileindex_entry_perms_set(ie, 0);
119 		} else {
120 			got_fileindex_entry_filetype_set(ie,
121 			    GOT_FILEIDX_MODE_REGULAR_FILE);
122 			fileindex_entry_perms_set(ie,
123 			    sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO));
124 		}
125 	}
126 
127 	if (blob_sha1) {
128 		memcpy(ie->blob_sha1, blob_sha1, SHA1_DIGEST_LENGTH);
129 		ie->flags &= ~GOT_FILEIDX_F_NO_BLOB;
130 	} else
131 		ie->flags |= GOT_FILEIDX_F_NO_BLOB;
132 
133 	if (commit_sha1) {
134 		memcpy(ie->commit_sha1, commit_sha1, SHA1_DIGEST_LENGTH);
135 		ie->flags &= ~GOT_FILEIDX_F_NO_COMMIT;
136 	} else
137 		ie->flags |= GOT_FILEIDX_F_NO_COMMIT;
138 
139 	return NULL;
140 }
141 
142 void
143 got_fileindex_entry_mark_deleted_from_disk(struct got_fileindex_entry *ie)
144 {
145 	ie->flags |= GOT_FILEIDX_F_NO_FILE_ON_DISK;
146 }
147 
148 void
149 got_fileindex_entry_mark_skipped(struct got_fileindex_entry *ie)
150 {
151 	ie->flags |= GOT_FILEIDX_F_SKIPPED;
152 }
153 
154 const struct got_error *
155 got_fileindex_entry_alloc(struct got_fileindex_entry **ie,
156     const char *relpath)
157 {
158 	size_t len;
159 
160 	*ie = calloc(1, sizeof(**ie));
161 	if (*ie == NULL)
162 		return got_error_from_errno("calloc");
163 
164 	(*ie)->path = strdup(relpath);
165 	if ((*ie)->path == NULL) {
166 		const struct got_error *err = got_error_from_errno("strdup");
167 		free(*ie);
168 		*ie = NULL;
169 		return err;
170 	}
171 
172 	len = strlen(relpath);
173 	if (len > GOT_FILEIDX_F_PATH_LEN)
174 		len = GOT_FILEIDX_F_PATH_LEN;
175 	(*ie)->flags |= len;
176 
177 	return NULL;
178 }
179 
180 void
181 got_fileindex_entry_free(struct got_fileindex_entry *ie)
182 {
183 	free(ie->path);
184 	free(ie);
185 }
186 
187 size_t
188 got_fileindex_entry_path_len(const struct got_fileindex_entry *ie)
189 {
190 	return (size_t)(ie->flags & GOT_FILEIDX_F_PATH_LEN);
191 }
192 
193 uint32_t
194 got_fileindex_entry_stage_get(const struct got_fileindex_entry *ie)
195 {
196 	return ((ie->flags & GOT_FILEIDX_F_STAGE) >> GOT_FILEIDX_F_STAGE_SHIFT);
197 }
198 
199 void
200 got_fileindex_entry_stage_set(struct got_fileindex_entry *ie, uint32_t stage)
201 {
202 	ie->flags &= ~GOT_FILEIDX_F_STAGE;
203 	ie->flags |= ((stage << GOT_FILEIDX_F_STAGE_SHIFT) &
204 	    GOT_FILEIDX_F_STAGE);
205 }
206 
207 int
208 got_fileindex_entry_filetype_get(struct got_fileindex_entry *ie)
209 {
210 	return (ie->mode & GOT_FILEIDX_MODE_FILE_TYPE_ONDISK);
211 }
212 
213 void
214 got_fileindex_entry_filetype_set(struct got_fileindex_entry *ie, int type)
215 {
216 	ie->mode &= ~GOT_FILEIDX_MODE_FILE_TYPE_ONDISK;
217 	ie->mode |= (type & GOT_FILEIDX_MODE_FILE_TYPE_ONDISK);
218 }
219 
220 void
221 got_fileindex_entry_staged_filetype_set(struct got_fileindex_entry *ie,
222     int type)
223 {
224 	ie->mode &= ~GOT_FILEIDX_MODE_FILE_TYPE_STAGED;
225 	ie->mode |= ((type << GOT_FILEIDX_MODE_FILE_TYPE_STAGED_SHIFT) &
226 	    GOT_FILEIDX_MODE_FILE_TYPE_STAGED);
227 }
228 
229 int
230 got_fileindex_entry_staged_filetype_get(struct got_fileindex_entry *ie)
231 {
232 	return (ie->mode & GOT_FILEIDX_MODE_FILE_TYPE_STAGED) >>
233 	    GOT_FILEIDX_MODE_FILE_TYPE_STAGED_SHIFT;
234 }
235 
236 int
237 got_fileindex_entry_has_blob(struct got_fileindex_entry *ie)
238 {
239 	return (ie->flags & GOT_FILEIDX_F_NO_BLOB) == 0;
240 }
241 
242 int
243 got_fileindex_entry_has_commit(struct got_fileindex_entry *ie)
244 {
245 	return (ie->flags & GOT_FILEIDX_F_NO_COMMIT) == 0;
246 }
247 
248 int
249 got_fileindex_entry_has_file_on_disk(struct got_fileindex_entry *ie)
250 {
251 	return (ie->flags & GOT_FILEIDX_F_NO_FILE_ON_DISK) == 0;
252 }
253 
254 int
255 got_fileindex_entry_was_skipped(struct got_fileindex_entry *ie)
256 {
257 	return (ie->flags & GOT_FILEIDX_F_SKIPPED) != 0;
258 }
259 
260 static const struct got_error *
261 add_entry(struct got_fileindex *fileindex, struct got_fileindex_entry *ie)
262 {
263 	if (fileindex->nentries >= GOT_FILEIDX_MAX_ENTRIES)
264 		return got_error(GOT_ERR_NO_SPACE);
265 
266 	if (RB_INSERT(got_fileindex_tree, &fileindex->entries, ie) != NULL)
267 		return got_error_path(ie->path, GOT_ERR_FILEIDX_DUP_ENTRY);
268 
269 	fileindex->nentries++;
270 	return NULL;
271 }
272 
273 const struct got_error *
274 got_fileindex_entry_add(struct got_fileindex *fileindex,
275     struct got_fileindex_entry *ie)
276 {
277 	/* Flag this entry until it gets written out to disk. */
278 	ie->flags |= GOT_FILEIDX_F_NOT_FLUSHED;
279 
280 	return add_entry(fileindex, ie);
281 }
282 
283 void
284 got_fileindex_entry_remove(struct got_fileindex *fileindex,
285     struct got_fileindex_entry *ie)
286 {
287 	/*
288 	 * Removing an entry from the RB tree immediately breaks
289 	 * in-progress iterations over file index entries.
290 	 * So flag this entry for removal and remove it once the index
291 	 * is written out to disk. Meanwhile, pretend this entry no longer
292 	 * exists if we get queried for it again before then.
293 	 */
294 	ie->flags |= GOT_FILEIDX_F_REMOVE_ON_FLUSH;
295 	fileindex->nentries--;
296 }
297 
298 struct got_fileindex_entry *
299 got_fileindex_entry_get(struct got_fileindex *fileindex, const char *path,
300     size_t path_len)
301 {
302 	struct got_fileindex_entry *ie;
303 	struct got_fileindex_entry key;
304 	memset(&key, 0, sizeof(key));
305 	key.path = (char *)path;
306 	key.flags = (path_len & GOT_FILEIDX_F_PATH_LEN);
307 	ie = RB_FIND(got_fileindex_tree, &fileindex->entries, &key);
308 	if (ie && (ie->flags & GOT_FILEIDX_F_REMOVE_ON_FLUSH))
309 		return NULL;
310 	return ie;
311 }
312 
313 const struct got_error *
314 got_fileindex_for_each_entry_safe(struct got_fileindex *fileindex,
315     got_fileindex_cb cb, void *cb_arg)
316 {
317 	const struct got_error *err;
318 	struct got_fileindex_entry *ie, *tmp;
319 
320 	RB_FOREACH_SAFE(ie, got_fileindex_tree, &fileindex->entries, tmp) {
321 		if (ie->flags & GOT_FILEIDX_F_REMOVE_ON_FLUSH)
322 			continue;
323 		err = (*cb)(cb_arg, ie);
324 		if (err)
325 			return err;
326 	}
327 	return NULL;
328 }
329 
330 struct got_fileindex *
331 got_fileindex_alloc(void)
332 {
333 	struct got_fileindex *fileindex;
334 
335 	fileindex = calloc(1, sizeof(*fileindex));
336 	if (fileindex == NULL)
337 		return NULL;
338 
339 	RB_INIT(&fileindex->entries);
340 	return fileindex;
341 }
342 
343 void
344 got_fileindex_free(struct got_fileindex *fileindex)
345 {
346 	struct got_fileindex_entry *ie;
347 
348 	while ((ie = RB_MIN(got_fileindex_tree, &fileindex->entries))) {
349 		RB_REMOVE(got_fileindex_tree, &fileindex->entries, ie);
350 		got_fileindex_entry_free(ie);
351 	}
352 	free(fileindex);
353 }
354 
355 static const struct got_error *
356 write_fileindex_val64(struct got_hash *ctx, uint64_t val, FILE *outfile)
357 {
358 	size_t n;
359 
360 	val = htobe64(val);
361 	got_hash_update(ctx, &val, sizeof(val));
362 	n = fwrite(&val, 1, sizeof(val), outfile);
363 	if (n != sizeof(val))
364 		return got_ferror(outfile, GOT_ERR_IO);
365 	return NULL;
366 }
367 
368 static const struct got_error *
369 write_fileindex_val32(struct got_hash *ctx, uint32_t val, FILE *outfile)
370 {
371 	size_t n;
372 
373 	val = htobe32(val);
374 	got_hash_update(ctx, &val, sizeof(val));
375 	n = fwrite(&val, 1, sizeof(val), outfile);
376 	if (n != sizeof(val))
377 		return got_ferror(outfile, GOT_ERR_IO);
378 	return NULL;
379 }
380 
381 static const struct got_error *
382 write_fileindex_val16(struct got_hash *ctx, uint16_t val, FILE *outfile)
383 {
384 	size_t n;
385 
386 	val = htobe16(val);
387 	got_hash_update(ctx, &val, sizeof(val));
388 	n = fwrite(&val, 1, sizeof(val), outfile);
389 	if (n != sizeof(val))
390 		return got_ferror(outfile, GOT_ERR_IO);
391 	return NULL;
392 }
393 
394 static const struct got_error *
395 write_fileindex_path(struct got_hash *ctx, const char *path, FILE *outfile)
396 {
397 	size_t n, len, pad = 0;
398 	static const uint8_t zero[8] = { 0 };
399 
400 	len = strlen(path);
401 	while ((len + pad) % 8 != 0)
402 		pad++;
403 	if (pad == 0)
404 		pad = 8; /* NUL-terminate */
405 
406 	got_hash_update(ctx, path, len);
407 	n = fwrite(path, 1, len, outfile);
408 	if (n != len)
409 		return got_ferror(outfile, GOT_ERR_IO);
410 	got_hash_update(ctx, zero, pad);
411 	n = fwrite(zero, 1, pad, outfile);
412 	if (n != pad)
413 		return got_ferror(outfile, GOT_ERR_IO);
414 	return NULL;
415 }
416 
417 static const struct got_error *
418 write_fileindex_entry(struct got_hash *ctx, struct got_fileindex_entry *ie,
419     FILE *outfile)
420 {
421 	const struct got_error *err;
422 	size_t n;
423 	uint32_t stage;
424 
425 	err = write_fileindex_val64(ctx, ie->ctime_sec, outfile);
426 	if (err)
427 		return err;
428 	err = write_fileindex_val64(ctx, ie->ctime_nsec, outfile);
429 	if (err)
430 		return err;
431 	err = write_fileindex_val64(ctx, ie->mtime_sec, outfile);
432 	if (err)
433 		return err;
434 	err = write_fileindex_val64(ctx, ie->mtime_nsec, outfile);
435 	if (err)
436 		return err;
437 
438 	err = write_fileindex_val32(ctx, ie->uid, outfile);
439 	if (err)
440 		return err;
441 	err = write_fileindex_val32(ctx, ie->gid, outfile);
442 	if (err)
443 		return err;
444 	err = write_fileindex_val32(ctx, ie->size, outfile);
445 	if (err)
446 		return err;
447 
448 	err = write_fileindex_val16(ctx, ie->mode, outfile);
449 	if (err)
450 		return err;
451 
452 	got_hash_update(ctx, ie->blob_sha1, SHA1_DIGEST_LENGTH);
453 	n = fwrite(ie->blob_sha1, 1, SHA1_DIGEST_LENGTH, outfile);
454 	if (n != SHA1_DIGEST_LENGTH)
455 		return got_ferror(outfile, GOT_ERR_IO);
456 
457 	got_hash_update(ctx, ie->commit_sha1, SHA1_DIGEST_LENGTH);
458 	n = fwrite(ie->commit_sha1, 1, SHA1_DIGEST_LENGTH, outfile);
459 	if (n != SHA1_DIGEST_LENGTH)
460 		return got_ferror(outfile, GOT_ERR_IO);
461 
462 	err = write_fileindex_val32(ctx, ie->flags, outfile);
463 	if (err)
464 		return err;
465 
466 	err = write_fileindex_path(ctx, ie->path, outfile);
467 	if (err)
468 		return err;
469 
470 	stage = got_fileindex_entry_stage_get(ie);
471 	if (stage == GOT_FILEIDX_STAGE_MODIFY ||
472 	    stage == GOT_FILEIDX_STAGE_ADD) {
473 		got_hash_update(ctx, ie->staged_blob_sha1, SHA1_DIGEST_LENGTH);
474 		n = fwrite(ie->staged_blob_sha1, 1, SHA1_DIGEST_LENGTH,
475 		    outfile);
476 		if (n != SHA1_DIGEST_LENGTH)
477 			return got_ferror(outfile, GOT_ERR_IO);
478 	}
479 
480 	return NULL;
481 }
482 
483 const struct got_error *
484 got_fileindex_write(struct got_fileindex *fileindex, FILE *outfile)
485 {
486 	const struct got_error *err = NULL;
487 	struct got_fileindex_hdr hdr;
488 	struct got_hash ctx;
489 	uint8_t hash[GOT_HASH_DIGEST_MAXLEN];
490 	size_t n;
491 	struct got_fileindex_entry *ie, *tmp;
492 
493 	got_hash_init(&ctx, GOT_HASH_SHA1);
494 
495 	hdr.signature = htobe32(GOT_FILE_INDEX_SIGNATURE);
496 	hdr.version = htobe32(GOT_FILE_INDEX_VERSION);
497 	hdr.nentries = htobe32(fileindex->nentries);
498 
499 	got_hash_update(&ctx, &hdr.signature, sizeof(hdr.signature));
500 	got_hash_update(&ctx, &hdr.version, sizeof(hdr.version));
501 	got_hash_update(&ctx, &hdr.nentries, sizeof(hdr.nentries));
502 	n = fwrite(&hdr.signature, 1, sizeof(hdr.signature), outfile);
503 	if (n != sizeof(hdr.signature))
504 		return got_ferror(outfile, GOT_ERR_IO);
505 	n = fwrite(&hdr.version, 1, sizeof(hdr.version), outfile);
506 	if (n != sizeof(hdr.version))
507 		return got_ferror(outfile, GOT_ERR_IO);
508 	n = fwrite(&hdr.nentries, 1, sizeof(hdr.nentries), outfile);
509 	if (n != sizeof(hdr.nentries))
510 		return got_ferror(outfile, GOT_ERR_IO);
511 
512 	RB_FOREACH_SAFE(ie, got_fileindex_tree, &fileindex->entries, tmp) {
513 		ie->flags &= ~GOT_FILEIDX_F_NOT_FLUSHED;
514 		ie->flags &= ~GOT_FILEIDX_F_SKIPPED;
515 		if (ie->flags & GOT_FILEIDX_F_REMOVE_ON_FLUSH) {
516 			RB_REMOVE(got_fileindex_tree, &fileindex->entries, ie);
517 			got_fileindex_entry_free(ie);
518 			continue;
519 		}
520 		err = write_fileindex_entry(&ctx, ie, outfile);
521 		if (err)
522 			return err;
523 	}
524 
525 	got_hash_final(&ctx, hash);
526 	n = fwrite(hash, 1, SHA1_DIGEST_LENGTH, outfile);
527 	if (n != SHA1_DIGEST_LENGTH)
528 		return got_ferror(outfile, GOT_ERR_IO);
529 
530 	if (fflush(outfile) != 0)
531 		return got_error_from_errno("fflush");
532 
533 	return NULL;
534 }
535 
536 static const struct got_error *
537 read_fileindex_val64(uint64_t *val, struct got_hash *ctx, FILE *infile)
538 {
539 	size_t n;
540 
541 	n = fread(val, 1, sizeof(*val), infile);
542 	if (n != sizeof(*val))
543 		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
544 	got_hash_update(ctx, val, sizeof(*val));
545 	*val = be64toh(*val);
546 	return NULL;
547 }
548 
549 static const struct got_error *
550 read_fileindex_val32(uint32_t *val, struct got_hash *ctx, FILE *infile)
551 {
552 	size_t n;
553 
554 	n = fread(val, 1, sizeof(*val), infile);
555 	if (n != sizeof(*val))
556 		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
557 	got_hash_update(ctx, val, sizeof(*val));
558 	*val = be32toh(*val);
559 	return NULL;
560 }
561 
562 static const struct got_error *
563 read_fileindex_val16(uint16_t *val, struct got_hash *ctx, FILE *infile)
564 {
565 	size_t n;
566 
567 	n = fread(val, 1, sizeof(*val), infile);
568 	if (n != sizeof(*val))
569 		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
570 	got_hash_update(ctx, val, sizeof(*val));
571 	*val = be16toh(*val);
572 	return NULL;
573 }
574 
575 static const struct got_error *
576 read_fileindex_path(char **path, struct got_hash *ctx, FILE *infile)
577 {
578 	const struct got_error *err = NULL;
579 	const size_t chunk_size = 8;
580 	size_t n, len = 0, totlen = chunk_size;
581 
582 	*path = malloc(totlen);
583 	if (*path == NULL)
584 		return got_error_from_errno("malloc");
585 
586 	do {
587 		if (len + chunk_size > totlen) {
588 			char *p = reallocarray(*path, totlen + chunk_size, 1);
589 			if (p == NULL) {
590 				err = got_error_from_errno("reallocarray");
591 				break;
592 			}
593 			totlen += chunk_size;
594 			*path = p;
595 		}
596 		n = fread(*path + len, 1, chunk_size, infile);
597 		if (n != chunk_size) {
598 			err = got_ferror(infile, GOT_ERR_FILEIDX_BAD);
599 			break;
600 		}
601 		got_hash_update(ctx, *path + len, chunk_size);
602 		len += chunk_size;
603 	} while (memchr(*path + len - chunk_size, '\0', chunk_size) == NULL);
604 
605 	if (err) {
606 		free(*path);
607 		*path = NULL;
608 	}
609 	return err;
610 }
611 
612 static const struct got_error *
613 read_fileindex_entry(struct got_fileindex_entry **iep, struct got_hash *ctx,
614     FILE *infile, uint32_t version)
615 {
616 	const struct got_error *err;
617 	struct got_fileindex_entry *ie;
618 	size_t n;
619 
620 	*iep = NULL;
621 
622 	ie = calloc(1, sizeof(*ie));
623 	if (ie == NULL)
624 		return got_error_from_errno("calloc");
625 
626 	err = read_fileindex_val64(&ie->ctime_sec, ctx, infile);
627 	if (err)
628 		goto done;
629 	err = read_fileindex_val64(&ie->ctime_nsec, ctx, infile);
630 	if (err)
631 		goto done;
632 	err = read_fileindex_val64(&ie->mtime_sec, ctx, infile);
633 	if (err)
634 		goto done;
635 	err = read_fileindex_val64(&ie->mtime_nsec, ctx, infile);
636 	if (err)
637 		goto done;
638 
639 	err = read_fileindex_val32(&ie->uid, ctx, infile);
640 	if (err)
641 		goto done;
642 	err = read_fileindex_val32(&ie->gid, ctx, infile);
643 	if (err)
644 		goto done;
645 	err = read_fileindex_val32(&ie->size, ctx, infile);
646 	if (err)
647 		goto done;
648 
649 	err = read_fileindex_val16(&ie->mode, ctx, infile);
650 	if (err)
651 		goto done;
652 
653 	n = fread(ie->blob_sha1, 1, SHA1_DIGEST_LENGTH, infile);
654 	if (n != SHA1_DIGEST_LENGTH) {
655 		err = got_ferror(infile, GOT_ERR_FILEIDX_BAD);
656 		goto done;
657 	}
658 	got_hash_update(ctx, ie->blob_sha1, SHA1_DIGEST_LENGTH);
659 
660 	n = fread(ie->commit_sha1, 1, SHA1_DIGEST_LENGTH, infile);
661 	if (n != SHA1_DIGEST_LENGTH) {
662 		err = got_ferror(infile, GOT_ERR_FILEIDX_BAD);
663 		goto done;
664 	}
665 	got_hash_update(ctx, ie->commit_sha1, SHA1_DIGEST_LENGTH);
666 
667 	err = read_fileindex_val32(&ie->flags, ctx, infile);
668 	if (err)
669 		goto done;
670 
671 	err = read_fileindex_path(&ie->path, ctx, infile);
672 	if (err)
673 		goto done;
674 
675 	if (version >= 2) {
676 		uint32_t stage = got_fileindex_entry_stage_get(ie);
677 		if (stage == GOT_FILEIDX_STAGE_MODIFY ||
678 		    stage == GOT_FILEIDX_STAGE_ADD) {
679 			n = fread(ie->staged_blob_sha1, 1, SHA1_DIGEST_LENGTH,
680 			    infile);
681 			if (n != SHA1_DIGEST_LENGTH) {
682 				err = got_ferror(infile, GOT_ERR_FILEIDX_BAD);
683 				goto done;
684 			}
685 			got_hash_update(ctx, ie->staged_blob_sha1,
686 			    SHA1_DIGEST_LENGTH);
687 		}
688 	} else {
689 		/* GOT_FILE_INDEX_VERSION 1 does not support staging. */
690 		ie->flags &= ~GOT_FILEIDX_F_STAGE;
691 	}
692 
693 done:
694 	if (err)
695 		got_fileindex_entry_free(ie);
696 	else
697 		*iep = ie;
698 	return err;
699 }
700 
701 const struct got_error *
702 got_fileindex_read(struct got_fileindex *fileindex, FILE *infile)
703 {
704 	const struct got_error *err = NULL;
705 	struct got_fileindex_hdr hdr;
706 	struct got_hash ctx;
707 	struct got_fileindex_entry *ie;
708 	uint8_t sha1_expected[SHA1_DIGEST_LENGTH];
709 	uint8_t sha1[SHA1_DIGEST_LENGTH];
710 	size_t n;
711 	int i;
712 
713 	got_hash_init(&ctx, GOT_HASH_SHA1);
714 
715 	n = fread(&hdr.signature, 1, sizeof(hdr.signature), infile);
716 	if (n != sizeof(hdr.signature)) {
717 		if (n == 0) /* EOF */
718 			return NULL;
719 		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
720 	}
721 	n = fread(&hdr.version, 1, sizeof(hdr.version), infile);
722 	if (n != sizeof(hdr.version)) {
723 		if (n == 0) /* EOF */
724 			return NULL;
725 		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
726 	}
727 	n = fread(&hdr.nentries, 1, sizeof(hdr.nentries), infile);
728 	if (n != sizeof(hdr.nentries)) {
729 		if (n == 0) /* EOF */
730 			return NULL;
731 		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
732 	}
733 
734 	got_hash_update(&ctx, &hdr.signature, sizeof(hdr.signature));
735 	got_hash_update(&ctx, &hdr.version, sizeof(hdr.version));
736 	got_hash_update(&ctx, &hdr.nentries, sizeof(hdr.nentries));
737 
738 	hdr.signature = be32toh(hdr.signature);
739 	hdr.version = be32toh(hdr.version);
740 	hdr.nentries = be32toh(hdr.nentries);
741 
742 	if (hdr.signature != GOT_FILE_INDEX_SIGNATURE)
743 		return got_error(GOT_ERR_FILEIDX_SIG);
744 	if (hdr.version > GOT_FILE_INDEX_VERSION)
745 		return got_error(GOT_ERR_FILEIDX_VER);
746 
747 	for (i = 0; i < hdr.nentries; i++) {
748 		err = read_fileindex_entry(&ie, &ctx, infile, hdr.version);
749 		if (err)
750 			return err;
751 		err = add_entry(fileindex, ie);
752 		if (err)
753 			return err;
754 	}
755 
756 	n = fread(sha1_expected, 1, sizeof(sha1_expected), infile);
757 	if (n != sizeof(sha1_expected))
758 		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
759 	got_hash_final(&ctx, sha1);
760 	if (memcmp(sha1, sha1_expected, SHA1_DIGEST_LENGTH) != 0)
761 		return got_error(GOT_ERR_FILEIDX_CSUM);
762 
763 	return NULL;
764 }
765 
766 static struct got_fileindex_entry *
767 walk_fileindex(struct got_fileindex *fileindex, struct got_fileindex_entry *ie)
768 {
769 	struct got_fileindex_entry *next;
770 
771 	next = RB_NEXT(got_fileindex_tree, &fileindex->entries, ie);
772 
773 	/* Skip entries which were added or removed by diff callbacks. */
774 	while (next && (next->flags & (GOT_FILEIDX_F_NOT_FLUSHED |
775 	    GOT_FILEIDX_F_REMOVE_ON_FLUSH)))
776 		next = RB_NEXT(got_fileindex_tree, &fileindex->entries, next);
777 
778 	return next;
779 }
780 
781 static const struct got_error *
782 diff_fileindex_tree(struct got_fileindex *, struct got_fileindex_entry **ie,
783     struct got_tree_object *tree, const char *, const char *,
784     struct got_repository *, struct got_fileindex_diff_tree_cb *, void *);
785 
786 static const struct got_error *
787 walk_tree(struct got_tree_entry **next, struct got_fileindex *fileindex,
788     struct got_fileindex_entry **ie, struct got_tree_object *tree, int *tidx,
789     const char *path, const char *entry_name, struct got_repository *repo,
790     struct got_fileindex_diff_tree_cb *cb, void *cb_arg)
791 {
792 	const struct got_error *err = NULL;
793 	struct got_tree_entry *te = got_object_tree_get_entry(tree, *tidx);
794 
795 	if (!got_object_tree_entry_is_submodule(te) &&
796 	    S_ISDIR(got_tree_entry_get_mode(te))) {
797 		char *subpath;
798 		struct got_tree_object *subtree;
799 
800 		if (asprintf(&subpath, "%s%s%s", path,
801 		    path[0] == '\0' ? "" : "/",
802 		    got_tree_entry_get_name(te)) == -1)
803 			return got_error_from_errno("asprintf");
804 
805 		err = got_object_open_as_tree(&subtree, repo,
806 		    got_tree_entry_get_id(te));
807 		if (err) {
808 			free(subpath);
809 			return err;
810 		}
811 
812 		err = diff_fileindex_tree(fileindex, ie, subtree, subpath,
813 		    entry_name, repo, cb, cb_arg);
814 		free(subpath);
815 		got_object_tree_close(subtree);
816 		if (err)
817 			return err;
818 	}
819 
820 	(*tidx)++;
821 	*next = got_object_tree_get_entry(tree, *tidx);
822 	return NULL;
823 }
824 
825 static const struct got_error *
826 diff_fileindex_tree(struct got_fileindex *fileindex,
827     struct got_fileindex_entry **ie, struct got_tree_object *tree,
828     const char *path, const char *entry_name, struct got_repository *repo,
829     struct got_fileindex_diff_tree_cb *cb, void *cb_arg)
830 {
831 	const struct got_error *err = NULL;
832 	struct got_tree_entry *te = NULL;
833 	size_t path_len = strlen(path);
834 	struct got_fileindex_entry *next;
835 	int tidx = 0;
836 
837 	te = got_object_tree_get_entry(tree, tidx);
838 	while ((*ie && got_path_is_child((*ie)->path, path, path_len)) || te) {
839 		if (te && *ie) {
840 			char *te_path;
841 			const char *te_name = got_tree_entry_get_name(te);
842 			int cmp;
843 			if (asprintf(&te_path, "%s/%s", path, te_name) == -1) {
844 				err = got_error_from_errno("asprintf");
845 				break;
846 			}
847 			cmp = got_path_cmp((*ie)->path, te_path,
848 			    got_fileindex_entry_path_len(*ie), strlen(te_path));
849 			free(te_path);
850 			if (cmp == 0) {
851 				if (got_path_is_child((*ie)->path, path,
852 				    path_len) &&
853 				    !got_object_tree_entry_is_submodule(te) &&
854 				    (entry_name == NULL ||
855 				    strcmp(te_name, entry_name) == 0)) {
856 					err = cb->diff_old_new(cb_arg, *ie, te,
857 					    path);
858 					if (err || entry_name)
859 						break;
860 				}
861 				*ie = walk_fileindex(fileindex, *ie);
862 				err = walk_tree(&te, fileindex, ie, tree, &tidx,
863 				    path, entry_name, repo, cb, cb_arg);
864 			} else if (cmp < 0) {
865 				next = walk_fileindex(fileindex, *ie);
866 				if (got_path_is_child((*ie)->path, path,
867 				    path_len) && entry_name == NULL) {
868 					err = cb->diff_old(cb_arg, *ie, path);
869 					if (err || entry_name)
870 						break;
871 				}
872 				*ie = next;
873 			} else {
874 				if ((entry_name == NULL ||
875 				    strcmp(te_name, entry_name) == 0)) {
876 					err = cb->diff_new(cb_arg, te, path);
877 					if (err || entry_name)
878 						break;
879 				}
880 				err = walk_tree(&te, fileindex, ie, tree, &tidx,
881 				    path, entry_name, repo, cb, cb_arg);
882 			}
883 			if (err)
884 				break;
885 		} else if (*ie) {
886 			next = walk_fileindex(fileindex, *ie);
887 			if (got_path_is_child((*ie)->path, path, path_len) &&
888 			    (entry_name == NULL ||
889 			    (te && strcmp(got_tree_entry_get_name(te),
890 			    entry_name) == 0))) {
891 				err = cb->diff_old(cb_arg, *ie, path);
892 				if (err || entry_name)
893 					break;
894 			}
895 			*ie = next;
896 		} else if (te) {
897 			if (!got_object_tree_entry_is_submodule(te) &&
898 			    (entry_name == NULL ||
899 			    strcmp(got_tree_entry_get_name(te), entry_name)
900 			    == 0)) {
901 				err = cb->diff_new(cb_arg, te, path);
902 				if (err || entry_name)
903 					break;
904 			}
905 			err = walk_tree(&te, fileindex, ie, tree, &tidx, path,
906 			    entry_name, repo, cb, cb_arg);
907 			if (err)
908 				break;
909 		}
910 	}
911 
912 	return err;
913 }
914 
915 const struct got_error *
916 got_fileindex_diff_tree(struct got_fileindex *fileindex,
917     struct got_tree_object *tree, const char *path, const char *entry_name,
918     struct got_repository *repo,
919     struct got_fileindex_diff_tree_cb *cb, void *cb_arg)
920 {
921 	struct got_fileindex_entry *ie;
922 	ie = RB_MIN(got_fileindex_tree, &fileindex->entries);
923 	while (ie && !got_path_is_child(ie->path, path, strlen(path)))
924 		ie = walk_fileindex(fileindex, ie);
925 	return diff_fileindex_tree(fileindex, &ie, tree, path, entry_name, repo,
926 	    cb, cb_arg);
927 }
928 
929 static const struct got_error *
930 diff_fileindex_dir(struct got_fileindex *, struct got_fileindex_entry **,
931     struct got_pathlist_head *, int, const char *, const char *,
932     struct got_repository *, struct got_fileindex_diff_dir_cb *, void *);
933 
934 static const struct got_error *
935 read_dirlist(struct got_pathlist_head *dirlist, DIR *dir, const char *path)
936 {
937 	const struct got_error *err = NULL;
938 	struct got_pathlist_entry *new = NULL;
939 	struct dirent *dep = NULL;
940 	struct dirent *de = NULL;
941 
942 	for (;;) {
943 		de = malloc(sizeof(struct dirent) + NAME_MAX + 1);
944 		if (de == NULL) {
945 			err = got_error_from_errno("malloc");
946 			break;
947 		}
948 
949 		if (readdir_r(dir, de, &dep) != 0) {
950 			err = got_error_from_errno("readdir_r");
951 			free(de);
952 			break;
953 		}
954 		if (dep == NULL) {
955 			free(de);
956 			break;
957 		}
958 
959 		if (strcmp(de->d_name, ".") == 0 ||
960 		    strcmp(de->d_name, "..") == 0 ||
961 		    (path[0] == '\0' &&
962 		    strcmp(de->d_name, GOT_WORKTREE_GOT_DIR) == 0)) {
963 			free(de);
964 			continue;
965 		}
966 
967 		err = got_pathlist_insert(&new, dirlist, de->d_name, de);
968 		if (err) {
969 			free(de);
970 			break;
971 		}
972 		if (new == NULL) {
973 			err = got_error(GOT_ERR_DIR_DUP_ENTRY);
974 			free(de);
975 			break;
976 		}
977 	}
978 
979 	return err;
980 }
981 
982 static int
983 have_tracked_file_in_dir(struct got_fileindex *fileindex, const char *path)
984 {
985 	struct got_fileindex_entry *ie;
986 	size_t path_len = strlen(path);
987 	int cmp;
988 
989 	ie = RB_ROOT(&fileindex->entries);
990 	while (ie) {
991 		if (got_path_is_child(ie->path, path, path_len))
992 			return 1;
993 		cmp = got_path_cmp(path, ie->path, path_len,
994 		    got_fileindex_entry_path_len(ie));
995 		if (cmp < 0)
996 			ie = RB_LEFT(ie, entry);
997 		else if (cmp > 0)
998 			ie = RB_RIGHT(ie, entry);
999 		else
1000 			break;
1001 	}
1002 
1003 	return 0;
1004 }
1005 
1006 static const struct got_error *
1007 walk_dir(struct got_pathlist_entry **next, struct got_fileindex *fileindex,
1008     struct got_fileindex_entry **ie, struct got_pathlist_entry *dle, int fd,
1009     const char *path, const char *rootpath, struct got_repository *repo,
1010     int ignore, struct got_fileindex_diff_dir_cb *cb, void *cb_arg)
1011 {
1012 	const struct got_error *err = NULL;
1013 	struct dirent *de = dle->data;
1014 	DIR *subdir = NULL;
1015 	int subdirfd = -1;
1016 
1017 	*next = NULL;
1018 
1019 	/* Must traverse ignored directories if they contain tracked files. */
1020 	if (de->d_type == DT_DIR && ignore &&
1021 	    have_tracked_file_in_dir(fileindex, path))
1022 		ignore = 0;
1023 
1024 	if (de->d_type == DT_DIR && !ignore) {
1025 		char *subpath;
1026 		char *subdirpath;
1027 		struct got_pathlist_head subdirlist;
1028 
1029 		TAILQ_INIT(&subdirlist);
1030 
1031 		if (asprintf(&subpath, "%s%s%s", path,
1032 		    path[0] == '\0' ? "" : "/", de->d_name) == -1)
1033 			return got_error_from_errno("asprintf");
1034 
1035 		if (asprintf(&subdirpath, "%s/%s", rootpath, subpath) == -1) {
1036 			free(subpath);
1037 			return got_error_from_errno("asprintf");
1038 		}
1039 
1040 		subdirfd = openat(fd, de->d_name,
1041 		    O_RDONLY | O_NOFOLLOW | O_DIRECTORY | O_CLOEXEC);
1042 		if (subdirfd == -1) {
1043 			if (errno == EACCES) {
1044 				*next = TAILQ_NEXT(dle, entry);
1045 				return NULL;
1046 			}
1047 			err = got_error_from_errno2("openat", subdirpath);
1048 			free(subpath);
1049 			free(subdirpath);
1050 			return err;
1051 		}
1052 
1053 		subdir = fdopendir(subdirfd);
1054 		if (subdir == NULL)
1055 			return got_error_from_errno2("fdopendir", path);
1056 		subdirfd = -1;
1057 		err = read_dirlist(&subdirlist, subdir, subdirpath);
1058 		if (err) {
1059 			free(subpath);
1060 			free(subdirpath);
1061 			closedir(subdir);
1062 			return err;
1063 		}
1064 		err = diff_fileindex_dir(fileindex, ie, &subdirlist,
1065 		    dirfd(subdir), rootpath, subpath, repo, cb, cb_arg);
1066 		if (subdir && closedir(subdir) == -1 && err == NULL)
1067 			err = got_error_from_errno2("closedir", subdirpath);
1068 		free(subpath);
1069 		free(subdirpath);
1070 		got_pathlist_free(&subdirlist, GOT_PATHLIST_FREE_DATA);
1071 		if (err)
1072 			return err;
1073 	}
1074 
1075 	*next = TAILQ_NEXT(dle, entry);
1076 	return NULL;
1077 }
1078 
1079 static const struct got_error *
1080 dirent_type_fixup(struct dirent *de, const char *rootpath, const char *path)
1081 {
1082 	const struct got_error *err;
1083 	char *dir_path;
1084 	int type;
1085 
1086 	if (de->d_type != DT_UNKNOWN)
1087 		return NULL;
1088 
1089 	/* DT_UNKNOWN occurs on NFS mounts without "readdir plus" RPC. */
1090 	if (asprintf(&dir_path, "%s/%s", rootpath, path) == -1)
1091 		return got_error_from_errno("asprintf");
1092 	err = got_path_dirent_type(&type, dir_path, de);
1093 	free(dir_path);
1094 	if (err)
1095 		return err;
1096 
1097 	de->d_type = type;
1098 	return NULL;
1099 }
1100 
1101 static const struct got_error *
1102 diff_fileindex_dir(struct got_fileindex *fileindex,
1103     struct got_fileindex_entry **ie, struct got_pathlist_head *dirlist,
1104     int dirfd, const char *rootpath, const char *path,
1105     struct got_repository *repo,
1106     struct got_fileindex_diff_dir_cb *cb, void *cb_arg)
1107 {
1108 	const struct got_error *err = NULL;
1109 	struct dirent *de = NULL;
1110 	size_t path_len = strlen(path);
1111 	struct got_pathlist_entry *dle;
1112 	int ignore;
1113 
1114 	if (cb->diff_traverse) {
1115 		err = cb->diff_traverse(cb_arg, path, dirfd);
1116 		if (err)
1117 			return err;
1118 	}
1119 
1120 	dle = TAILQ_FIRST(dirlist);
1121 	while ((*ie && got_path_is_child((*ie)->path, path, path_len)) || dle) {
1122 		if (dle && *ie) {
1123 			char *de_path;
1124 			int cmp;
1125 			de = dle->data;
1126 			err = dirent_type_fixup(de, rootpath, path);
1127 			if (err)
1128 				break;
1129 			if (asprintf(&de_path, "%s/%s", path,
1130 			    de->d_name) == -1) {
1131 				err = got_error_from_errno("asprintf");
1132 				break;
1133 			}
1134 			cmp = got_path_cmp((*ie)->path, de_path,
1135 			    got_fileindex_entry_path_len(*ie),
1136 			    strlen(path) + 1 + strlen(de->d_name));
1137 			free(de_path);
1138 			if (cmp == 0) {
1139 				err = cb->diff_old_new(cb_arg, *ie, de, path,
1140 				    dirfd);
1141 				if (err)
1142 					break;
1143 				*ie = walk_fileindex(fileindex, *ie);
1144 				err = walk_dir(&dle, fileindex, ie, dle, dirfd,
1145 				    path, rootpath, repo, 0, cb, cb_arg);
1146 			} else if (cmp < 0 ) {
1147 				err = cb->diff_old(cb_arg, *ie, path);
1148 				if (err)
1149 					break;
1150 				*ie = walk_fileindex(fileindex, *ie);
1151 			} else {
1152 				err = cb->diff_new(&ignore, cb_arg, de, path,
1153 				    dirfd);
1154 				if (err)
1155 					break;
1156 				err = walk_dir(&dle, fileindex, ie, dle, dirfd,
1157 				    path, rootpath, repo, ignore, cb, cb_arg);
1158 			}
1159 			if (err)
1160 				break;
1161 		} else if (*ie) {
1162 			err = cb->diff_old(cb_arg, *ie, path);
1163 			if (err)
1164 				break;
1165 			*ie = walk_fileindex(fileindex, *ie);
1166 		} else if (dle) {
1167 			de = dle->data;
1168 			err = dirent_type_fixup(de, rootpath, path);
1169 			if (err)
1170 				break;
1171 			err = cb->diff_new(&ignore, cb_arg, de, path, dirfd);
1172 			if (err)
1173 				break;
1174 			err = walk_dir(&dle, fileindex, ie, dle, dirfd, path,
1175 			    rootpath, repo, ignore, cb, cb_arg);
1176 			if (err)
1177 				break;
1178 		}
1179 	}
1180 
1181 	return err;
1182 }
1183 
1184 const struct got_error *
1185 got_fileindex_diff_dir(struct got_fileindex *fileindex, int fd,
1186     const char *rootpath, const char *path, struct got_repository *repo,
1187     struct got_fileindex_diff_dir_cb *cb, void *cb_arg)
1188 {
1189 	const struct got_error *err;
1190 	struct got_fileindex_entry *ie;
1191 	struct got_pathlist_head dirlist;
1192 	int fd2;
1193 	DIR *dir;
1194 
1195 	TAILQ_INIT(&dirlist);
1196 
1197 	/*
1198 	 * Duplicate the file descriptor so we can call closedir() below
1199 	 * without closing the file descriptor passed in by our caller.
1200 	 */
1201 	fd2 = dup(fd);
1202 	if (fd2 == -1)
1203 		return got_error_from_errno2("dup", path);
1204 	if (lseek(fd2, 0, SEEK_SET) == -1) {
1205 		err = got_error_from_errno2("lseek", path);
1206 		close(fd2);
1207 		return err;
1208 	}
1209 	dir = fdopendir(fd2);
1210 	if (dir == NULL) {
1211 		err = got_error_from_errno2("fdopendir", path);
1212 		close(fd2);
1213 		return err;
1214 	}
1215 	err = read_dirlist(&dirlist, dir, path);
1216 	if (err) {
1217 		closedir(dir);
1218 		return err;
1219 	}
1220 
1221 	ie = RB_MIN(got_fileindex_tree, &fileindex->entries);
1222 	while (ie && !got_path_is_child(ie->path, path, strlen(path)))
1223 		ie = walk_fileindex(fileindex, ie);
1224 	err = diff_fileindex_dir(fileindex, &ie, &dirlist, dirfd(dir),
1225 	    rootpath, path, repo, cb, cb_arg);
1226 
1227 	if (closedir(dir) == -1 && err == NULL)
1228 		err = got_error_from_errno2("closedir", path);
1229 	got_pathlist_free(&dirlist, GOT_PATHLIST_FREE_DATA);
1230 	return err;
1231 }
1232 
1233 struct got_object_id *
1234 got_fileindex_entry_get_staged_blob_id(struct got_object_id *id,
1235     struct got_fileindex_entry *ie)
1236 {
1237 	memset(id, 0, sizeof(*id));
1238 	memcpy(id->sha1, ie->staged_blob_sha1, sizeof(ie->staged_blob_sha1));
1239 	return id;
1240 }
1241 
1242 struct got_object_id *
1243 got_fileindex_entry_get_blob_id(struct got_object_id *id,
1244     struct got_fileindex_entry *ie)
1245 {
1246 	memset(id, 0, sizeof(*id));
1247 	memcpy(id->sha1, ie->blob_sha1, sizeof(ie->blob_sha1));
1248 	return id;
1249 }
1250 
1251 struct got_object_id *
1252 got_fileindex_entry_get_commit_id(struct got_object_id *id,
1253     struct got_fileindex_entry *ie)
1254 {
1255 	memset(id, 0, sizeof(*id));
1256 	memcpy(id->sha1, ie->commit_sha1, sizeof(ie->commit_sha1));
1257 	return id;
1258 }
1259 
1260 RB_GENERATE(got_fileindex_tree, got_fileindex_entry, entry, got_fileindex_cmp);