op public repos

Blob

Date:: Mon May 13 16:40:57 2019 UTC
Message:: rename got_error_prefix_errno() to got_error_from_errno()
Actions:: History | Blame | Raw File
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 <sys/queue.h>
18 #include <sys/tree.h>
19 #include <sys/stat.h>
20 
21 #include <errno.h>
22 #include <dirent.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <sha1.h>
27 #include <endian.h>
28 #include <limits.h>
29 #include <uuid.h>
30 
31 #include "got_error.h"
32 #include "got_object.h"
33 #include "got_path.h"
34 
35 #include "got_lib_fileindex.h"
36 #include "got_lib_worktree.h"
37 
38 /* got_fileindex_entry flags */
39 #define GOT_FILEIDX_F_PATH_LEN		0x00000fff
40 #define GOT_FILEIDX_F_STAGE		0x00003000
41 #define GOT_FILEIDX_F_EXTENDED		0x00004000
42 #define GOT_FILEIDX_F_ASSUME_VALID	0x00008000
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 
48 struct got_fileindex {
49 	struct got_fileindex_tree entries;
50 	int nentries;
51 #define GOT_FILEIDX_MAX_ENTRIES INT_MAX
52 };
53 
54 const struct got_error *
55 got_fileindex_entry_update(struct got_fileindex_entry *entry,
56     const char *ondisk_path, uint8_t *blob_sha1, uint8_t *commit_sha1,
57     int update_timestamps)
58 {
59 	struct stat sb;
60 
61 	if (lstat(ondisk_path, &sb) != 0) {
62 		if ((entry->flags & GOT_FILEIDX_F_NO_FILE_ON_DISK) == 0)
63 			return got_error_from_errno2("lstat", ondisk_path);
64 	} else {
65 		if (sb.st_mode & S_IFDIR)
66 			return got_error_set_errno(EISDIR, ondisk_path);
67 		entry->flags &= ~GOT_FILEIDX_F_NO_FILE_ON_DISK;
68 	}
69 
70 
71 	if ((entry->flags & GOT_FILEIDX_F_NO_FILE_ON_DISK) == 0) {
72 		if (update_timestamps) {
73 			entry->ctime_sec = sb.st_ctime;
74 			entry->ctime_nsec = sb.st_ctimensec;
75 			entry->mtime_sec = sb.st_mtime;
76 			entry->mtime_nsec = sb.st_mtimensec;
77 		}
78 		entry->uid = sb.st_uid;
79 		entry->gid = sb.st_gid;
80 		entry->size = (sb.st_size & 0xffffffff);
81 		if (sb.st_mode & S_IFLNK)
82 			entry->mode = GOT_FILEIDX_MODE_SYMLINK;
83 		else
84 			entry->mode = GOT_FILEIDX_MODE_REGULAR_FILE;
85 		entry->mode |= ((sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO)) <<
86 		    GOT_FILEIDX_MODE_PERMS_SHIFT);
87 	}
88 
89 	if (blob_sha1) {
90 		memcpy(entry->blob_sha1, blob_sha1, SHA1_DIGEST_LENGTH);
91 		entry->flags &= ~GOT_FILEIDX_F_NO_BLOB;
92 	} else
93 		entry->flags |= GOT_FILEIDX_F_NO_BLOB;
94 
95 	if (commit_sha1) {
96 		memcpy(entry->commit_sha1, commit_sha1, SHA1_DIGEST_LENGTH);
97 		entry->flags &= ~GOT_FILEIDX_F_NO_COMMIT;
98 	} else
99 		entry->flags |= GOT_FILEIDX_F_NO_COMMIT;
100 
101 	return NULL;
102 }
103 
104 void
105 got_fileindex_entry_mark_deleted_from_disk(struct got_fileindex_entry *entry)
106 {
107 	entry->flags |= GOT_FILEIDX_F_NO_FILE_ON_DISK;
108 }
109 
110 const struct got_error *
111 got_fileindex_entry_alloc(struct got_fileindex_entry **entry,
112     const char *ondisk_path, const char *relpath, uint8_t *blob_sha1,
113     uint8_t *commit_sha1)
114 {
115 	size_t len;
116 
117 	*entry = calloc(1, sizeof(**entry));
118 	if (*entry == NULL)
119 		return got_error_from_errno("calloc");
120 
121 	(*entry)->path = strdup(relpath);
122 	if ((*entry)->path == NULL) {
123 		const struct got_error *err = got_error_from_errno("strdup");
124 		free(*entry);
125 		*entry = NULL;
126 		return err;
127 	}
128 
129 	len = strlen(relpath);
130 	if (len > GOT_FILEIDX_F_PATH_LEN)
131 		len = GOT_FILEIDX_F_PATH_LEN;
132 	(*entry)->flags |= len;
133 
134 	return got_fileindex_entry_update(*entry, ondisk_path, blob_sha1,
135 	    commit_sha1, 1);
136 }
137 
138 void
139 got_fileindex_entry_free(struct got_fileindex_entry *entry)
140 {
141 	free(entry->path);
142 	free(entry);
143 }
144 
145 int
146 got_fileindex_entry_has_blob(struct got_fileindex_entry *ie)
147 {
148 	return (ie->flags & GOT_FILEIDX_F_NO_BLOB) == 0;
149 }
150 
151 int
152 got_fileindex_entry_has_commit(struct got_fileindex_entry *ie)
153 {
154 	return (ie->flags & GOT_FILEIDX_F_NO_COMMIT) == 0;
155 }
156 
157 int
158 got_fileindex_entry_has_file_on_disk(struct got_fileindex_entry *ie)
159 {
160 	return (ie->flags & GOT_FILEIDX_F_NO_FILE_ON_DISK) == 0;
161 }
162 
163 static const struct got_error *
164 add_entry(struct got_fileindex *fileindex, struct got_fileindex_entry *entry)
165 {
166 	if (fileindex->nentries >= GOT_FILEIDX_MAX_ENTRIES)
167 		return got_error(GOT_ERR_NO_SPACE);
168 
169 	RB_INSERT(got_fileindex_tree, &fileindex->entries, entry);
170 	fileindex->nentries++;
171 	return NULL;
172 }
173 
174 const struct got_error *
175 got_fileindex_entry_add(struct got_fileindex *fileindex,
176     struct got_fileindex_entry *entry)
177 {
178 	/* Flag this entry until it gets written out to disk. */
179 	entry->flags |= GOT_FILEIDX_F_NOT_FLUSHED;
180 
181 	return add_entry(fileindex, entry);
182 }
183 
184 void
185 got_fileindex_entry_remove(struct got_fileindex *fileindex,
186     struct got_fileindex_entry *entry)
187 {
188 	RB_REMOVE(got_fileindex_tree, &fileindex->entries, entry);
189 	fileindex->nentries--;
190 }
191 
192 struct got_fileindex_entry *
193 got_fileindex_entry_get(struct got_fileindex *fileindex, const char *path)
194 {
195 	struct got_fileindex_entry key;
196 	memset(&key, 0, sizeof(key));
197 	key.path = (char *)path;
198 	return RB_FIND(got_fileindex_tree, &fileindex->entries, &key);
199 }
200 
201 const struct got_error *
202 got_fileindex_for_each_entry_safe(struct got_fileindex *fileindex,
203     got_fileindex_cb cb, void *cb_arg)
204 {
205 	const struct got_error *err;
206 	struct got_fileindex_entry *entry, *tmp;
207 
208 	RB_FOREACH_SAFE(entry, got_fileindex_tree, &fileindex->entries, tmp) {
209 		err = (*cb)(cb_arg, entry);
210 		if (err)
211 			return err;
212 	}
213 	return NULL;
214 }
215 
216 struct got_fileindex *
217 got_fileindex_alloc(void)
218 {
219 	struct got_fileindex *fileindex;
220 
221 	fileindex = calloc(1, sizeof(*fileindex));
222 	if (fileindex == NULL)
223 		return NULL;
224 
225 	RB_INIT(&fileindex->entries);
226 	return fileindex;
227 }
228 
229 void
230 got_fileindex_free(struct got_fileindex *fileindex)
231 {
232 	struct got_fileindex_entry *entry;
233 
234 	while ((entry = RB_MIN(got_fileindex_tree, &fileindex->entries))) {
235 		RB_REMOVE(got_fileindex_tree, &fileindex->entries, entry);
236 		got_fileindex_entry_free(entry);
237 	}
238 	free(fileindex);
239 }
240 
241 static const struct got_error *
242 write_fileindex_val64(SHA1_CTX *ctx, uint64_t val, FILE *outfile)
243 {
244 	size_t n;
245 
246 	val = htobe64(val);
247 	SHA1Update(ctx, (uint8_t *)&val, sizeof(val));
248 	n = fwrite(&val, 1, sizeof(val), outfile);
249 	if (n != sizeof(val))
250 		return got_ferror(outfile, GOT_ERR_IO);
251 	return NULL;
252 }
253 
254 static const struct got_error *
255 write_fileindex_val32(SHA1_CTX *ctx, uint32_t val, FILE *outfile)
256 {
257 	size_t n;
258 
259 	val = htobe32(val);
260 	SHA1Update(ctx, (uint8_t *)&val, sizeof(val));
261 	n = fwrite(&val, 1, sizeof(val), outfile);
262 	if (n != sizeof(val))
263 		return got_ferror(outfile, GOT_ERR_IO);
264 	return NULL;
265 }
266 
267 static const struct got_error *
268 write_fileindex_val16(SHA1_CTX *ctx, uint16_t val, FILE *outfile)
269 {
270 	size_t n;
271 
272 	val = htobe16(val);
273 	SHA1Update(ctx, (uint8_t *)&val, sizeof(val));
274 	n = fwrite(&val, 1, sizeof(val), outfile);
275 	if (n != sizeof(val))
276 		return got_ferror(outfile, GOT_ERR_IO);
277 	return NULL;
278 }
279 
280 static const struct got_error *
281 write_fileindex_path(SHA1_CTX *ctx, const char *path, FILE *outfile)
282 {
283 	size_t n, len, pad = 0;
284 	static const uint8_t zero[8] = { 0 };
285 
286 	len = strlen(path);
287 	while ((len + pad) % 8 != 0)
288 		pad++;
289 	if (pad == 0)
290 		pad = 8; /* NUL-terminate */
291 
292 	SHA1Update(ctx, path, len);
293 	n = fwrite(path, 1, len, outfile);
294 	if (n != len)
295 		return got_ferror(outfile, GOT_ERR_IO);
296 	SHA1Update(ctx, zero, pad);
297 	n = fwrite(zero, 1, pad, outfile);
298 	if (n != pad)
299 		return got_ferror(outfile, GOT_ERR_IO);
300 	return NULL;
301 }
302 
303 static const struct got_error *
304 write_fileindex_entry(SHA1_CTX *ctx, struct got_fileindex_entry *entry,
305     FILE *outfile)
306 {
307 	const struct got_error *err;
308 	size_t n;
309 
310 	err = write_fileindex_val64(ctx, entry->ctime_sec, outfile);
311 	if (err)
312 		return err;
313 	err = write_fileindex_val64(ctx, entry->ctime_nsec, outfile);
314 	if (err)
315 		return err;
316 	err = write_fileindex_val64(ctx, entry->mtime_sec, outfile);
317 	if (err)
318 		return err;
319 	err = write_fileindex_val64(ctx, entry->mtime_nsec, outfile);
320 	if (err)
321 		return err;
322 
323 	err = write_fileindex_val32(ctx, entry->uid, outfile);
324 	if (err)
325 		return err;
326 	err = write_fileindex_val32(ctx, entry->gid, outfile);
327 	if (err)
328 		return err;
329 	err = write_fileindex_val32(ctx, entry->size, outfile);
330 	if (err)
331 		return err;
332 
333 	err = write_fileindex_val16(ctx, entry->mode, outfile);
334 	if (err)
335 		return err;
336 
337 	SHA1Update(ctx, entry->blob_sha1, SHA1_DIGEST_LENGTH);
338 	n = fwrite(entry->blob_sha1, 1, SHA1_DIGEST_LENGTH, outfile);
339 	if (n != SHA1_DIGEST_LENGTH)
340 		return got_ferror(outfile, GOT_ERR_IO);
341 
342 	SHA1Update(ctx, entry->commit_sha1, SHA1_DIGEST_LENGTH);
343 	n = fwrite(entry->commit_sha1, 1, SHA1_DIGEST_LENGTH, outfile);
344 	if (n != SHA1_DIGEST_LENGTH)
345 		return got_ferror(outfile, GOT_ERR_IO);
346 
347 	err = write_fileindex_val32(ctx, entry->flags, outfile);
348 	if (err)
349 		return err;
350 
351 	err = write_fileindex_path(ctx, entry->path, outfile);
352 	return err;
353 }
354 
355 const struct got_error *
356 got_fileindex_write(struct got_fileindex *fileindex, FILE *outfile)
357 {
358 	const struct got_error *err = NULL;
359 	struct got_fileindex_hdr hdr;
360 	SHA1_CTX ctx;
361 	uint8_t sha1[SHA1_DIGEST_LENGTH];
362 	size_t n;
363 	struct got_fileindex_entry *entry;
364 
365 	SHA1Init(&ctx);
366 
367 	hdr.signature = htobe32(GOT_FILE_INDEX_SIGNATURE);
368 	hdr.version = htobe32(GOT_FILE_INDEX_VERSION);
369 	hdr.nentries = htobe32(fileindex->nentries);
370 
371 	SHA1Update(&ctx, (uint8_t *)&hdr.signature, sizeof(hdr.signature));
372 	SHA1Update(&ctx, (uint8_t *)&hdr.version, sizeof(hdr.version));
373 	SHA1Update(&ctx, (uint8_t *)&hdr.nentries, sizeof(hdr.nentries));
374 	n = fwrite(&hdr.signature, 1, sizeof(hdr.signature), outfile);
375 	if (n != sizeof(hdr.signature))
376 		return got_ferror(outfile, GOT_ERR_IO);
377 	n = fwrite(&hdr.version, 1, sizeof(hdr.version), outfile);
378 	if (n != sizeof(hdr.version))
379 		return got_ferror(outfile, GOT_ERR_IO);
380 	n = fwrite(&hdr.nentries, 1, sizeof(hdr.nentries), outfile);
381 	if (n != sizeof(hdr.nentries))
382 		return got_ferror(outfile, GOT_ERR_IO);
383 
384 	RB_FOREACH(entry, got_fileindex_tree, &fileindex->entries) {
385 		entry->flags &= ~GOT_FILEIDX_F_NOT_FLUSHED;
386 		err = write_fileindex_entry(&ctx, entry, outfile);
387 		if (err)
388 			return err;
389 	}
390 
391 	SHA1Final(sha1, &ctx);
392 	n = fwrite(sha1, 1, sizeof(sha1), outfile);
393 	if (n != sizeof(sha1))
394 		return got_ferror(outfile, GOT_ERR_IO);
395 
396 	if (fflush(outfile) != 0)
397 		return got_error_from_errno("fflush");
398 
399 	return NULL;
400 }
401 
402 static const struct got_error *
403 read_fileindex_val64(uint64_t *val, SHA1_CTX *ctx, FILE *infile)
404 {
405 	size_t n;
406 
407 	n = fread(val, 1, sizeof(*val), infile);
408 	if (n != sizeof(*val))
409 		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
410 	SHA1Update(ctx, (uint8_t *)val, sizeof(*val));
411 	*val = be64toh(*val);
412 	return NULL;
413 }
414 
415 static const struct got_error *
416 read_fileindex_val32(uint32_t *val, SHA1_CTX *ctx, FILE *infile)
417 {
418 	size_t n;
419 
420 	n = fread(val, 1, sizeof(*val), infile);
421 	if (n != sizeof(*val))
422 		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
423 	SHA1Update(ctx, (uint8_t *)val, sizeof(*val));
424 	*val = be32toh(*val);
425 	return NULL;
426 }
427 
428 static const struct got_error *
429 read_fileindex_val16(uint16_t *val, SHA1_CTX *ctx, FILE *infile)
430 {
431 	size_t n;
432 
433 	n = fread(val, 1, sizeof(*val), infile);
434 	if (n != sizeof(*val))
435 		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
436 	SHA1Update(ctx, (uint8_t *)val, sizeof(*val));
437 	*val = be16toh(*val);
438 	return NULL;
439 }
440 
441 static const struct got_error *
442 read_fileindex_path(char **path, SHA1_CTX *ctx, FILE *infile)
443 {
444 	const struct got_error *err = NULL;
445 	uint8_t buf[8];
446 	size_t n, len = 0, totlen = sizeof(buf);
447 
448 	*path = malloc(totlen);
449 	if (*path == NULL)
450 		return got_error_from_errno("malloc");
451 
452 	do {
453 		n = fread(buf, 1, sizeof(buf), infile);
454 		if (n != sizeof(buf))
455 			return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
456 		if (len + sizeof(buf) > totlen) {
457 			char *p = reallocarray(*path, totlen + sizeof(buf), 1);
458 			if (p == NULL) {
459 				err = got_error_from_errno("reallocarray");
460 				break;
461 			}
462 			totlen += sizeof(buf);
463 			*path = p;
464 		}
465 		SHA1Update(ctx, buf, sizeof(buf));
466 		memcpy(*path + len, buf, sizeof(buf));
467 		len += sizeof(buf);
468 	} while (memchr(buf, '\0', sizeof(buf)) == NULL);
469 
470 	if (err) {
471 		free(*path);
472 		*path = NULL;
473 	}
474 	return err;
475 }
476 
477 static const struct got_error *
478 read_fileindex_entry(struct got_fileindex_entry **entryp, SHA1_CTX *ctx,
479     FILE *infile)
480 {
481 	const struct got_error *err;
482 	struct got_fileindex_entry *entry;
483 	size_t n;
484 
485 	*entryp = NULL;
486 
487 	entry = calloc(1, sizeof(*entry));
488 	if (entry == NULL)
489 		return got_error_from_errno("calloc");
490 
491 	err = read_fileindex_val64(&entry->ctime_sec, ctx, infile);
492 	if (err)
493 		goto done;
494 	err = read_fileindex_val64(&entry->ctime_nsec, ctx, infile);
495 	if (err)
496 		goto done;
497 	err = read_fileindex_val64(&entry->mtime_sec, ctx, infile);
498 	if (err)
499 		goto done;
500 	err = read_fileindex_val64(&entry->mtime_nsec, ctx, infile);
501 	if (err)
502 		goto done;
503 
504 	err = read_fileindex_val32(&entry->uid, ctx, infile);
505 	if (err)
506 		goto done;
507 	err = read_fileindex_val32(&entry->gid, ctx, infile);
508 	if (err)
509 		goto done;
510 	err = read_fileindex_val32(&entry->size, ctx, infile);
511 	if (err)
512 		goto done;
513 
514 	err = read_fileindex_val16(&entry->mode, ctx, infile);
515 	if (err)
516 		goto done;
517 
518 	n = fread(entry->blob_sha1, 1, SHA1_DIGEST_LENGTH, infile);
519 	if (n != SHA1_DIGEST_LENGTH) {
520 		err = got_ferror(infile, GOT_ERR_FILEIDX_BAD);
521 		goto done;
522 	}
523 	SHA1Update(ctx, entry->blob_sha1, SHA1_DIGEST_LENGTH);
524 
525 	n = fread(entry->commit_sha1, 1, SHA1_DIGEST_LENGTH, infile);
526 	if (n != SHA1_DIGEST_LENGTH) {
527 		err = got_ferror(infile, GOT_ERR_FILEIDX_BAD);
528 		goto done;
529 	}
530 	SHA1Update(ctx, entry->commit_sha1, SHA1_DIGEST_LENGTH);
531 
532 	err = read_fileindex_val32(&entry->flags, ctx, infile);
533 	if (err)
534 		goto done;
535 
536 	err = read_fileindex_path(&entry->path, ctx, infile);
537 done:
538 	if (err)
539 		free(entry);
540 	else
541 		*entryp = entry;
542 	return err;
543 }
544 
545 const struct got_error *
546 got_fileindex_read(struct got_fileindex *fileindex, FILE *infile)
547 {
548 	const struct got_error *err = NULL;
549 	struct got_fileindex_hdr hdr;
550 	SHA1_CTX ctx;
551 	struct got_fileindex_entry *entry;
552 	uint8_t sha1_expected[SHA1_DIGEST_LENGTH];
553 	uint8_t sha1[SHA1_DIGEST_LENGTH];
554 	size_t n;
555 	int i;
556 
557 	SHA1Init(&ctx);
558 
559 	n = fread(&hdr.signature, 1, sizeof(hdr.signature), infile);
560 	if (n != sizeof(hdr.signature)) {
561 		if (n == 0) /* EOF */
562 			return NULL;
563 		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
564 	}
565 	n = fread(&hdr.version, 1, sizeof(hdr.version), infile);
566 	if (n != sizeof(hdr.version)) {
567 		if (n == 0) /* EOF */
568 			return NULL;
569 		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
570 	}
571 	n = fread(&hdr.nentries, 1, sizeof(hdr.nentries), infile);
572 	if (n != sizeof(hdr.nentries)) {
573 		if (n == 0) /* EOF */
574 			return NULL;
575 		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
576 	}
577 
578 	SHA1Update(&ctx, (uint8_t *)&hdr.signature, sizeof(hdr.signature));
579 	SHA1Update(&ctx, (uint8_t *)&hdr.version, sizeof(hdr.version));
580 	SHA1Update(&ctx, (uint8_t *)&hdr.nentries, sizeof(hdr.nentries));
581 
582 	hdr.signature = be32toh(hdr.signature);
583 	hdr.version = be32toh(hdr.version);
584 	hdr.nentries = be32toh(hdr.nentries);
585 
586 	if (hdr.signature != GOT_FILE_INDEX_SIGNATURE)
587 		return got_error(GOT_ERR_FILEIDX_SIG);
588 	if (hdr.version != GOT_FILE_INDEX_VERSION)
589 		return got_error(GOT_ERR_FILEIDX_VER);
590 
591 	for (i = 0; i < hdr.nentries; i++) {
592 		err = read_fileindex_entry(&entry, &ctx, infile);
593 		if (err)
594 			return err;
595 		err = add_entry(fileindex, entry);
596 		if (err)
597 			return err;
598 	}
599 
600 	n = fread(sha1_expected, 1, sizeof(sha1_expected), infile);
601 	if (n != sizeof(sha1_expected))
602 		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
603 	SHA1Final(sha1, &ctx);
604 	if (memcmp(sha1, sha1_expected, SHA1_DIGEST_LENGTH) != 0)
605 		return got_error(GOT_ERR_FILEIDX_CSUM);
606 
607 	return NULL;
608 }
609 
610 static struct got_fileindex_entry *
611 walk_fileindex(struct got_fileindex *fileindex, struct got_fileindex_entry *ie)
612 {
613 	struct got_fileindex_entry *next;
614 
615 	next = RB_NEXT(got_fileindex_tree, &fileindex->entries, ie);
616 
617 	/* Skip entries which were newly added by diff callbacks. */
618 	while (next && (next->flags & GOT_FILEIDX_F_NOT_FLUSHED))
619 		next = RB_NEXT(got_fileindex_tree, &fileindex->entries, next);
620 
621 	return next;
622 }
623 
624 static const struct got_error *
625 diff_fileindex_tree(struct got_fileindex *, struct got_fileindex_entry **,
626     struct got_tree_object *, const char *, const char *,
627     struct got_repository *, struct got_fileindex_diff_tree_cb *, void *);
628 
629 static const struct got_error *
630 walk_tree(struct got_tree_entry **next, struct got_fileindex *fileindex,
631     struct got_fileindex_entry **ie, struct got_tree_entry *te,
632     const char *path, const char *entry_name, struct got_repository *repo,
633     struct got_fileindex_diff_tree_cb *cb, void *cb_arg)
634 {
635 	const struct got_error *err = NULL;
636 
637 	if (S_ISDIR(te->mode)) {
638 		char *subpath;
639 		struct got_tree_object *subtree;
640 
641 		if (asprintf(&subpath, "%s%s%s", path,
642 		    path[0] == '\0' ? "" : "/", te->name) == -1)
643 			return got_error_from_errno("asprintf");
644 
645 		err = got_object_open_as_tree(&subtree, repo, te->id);
646 		if (err) {
647 			free(subpath);
648 			return err;
649 		}
650 
651 		err = diff_fileindex_tree(fileindex, ie, subtree,
652 		    subpath, entry_name, repo, cb, cb_arg);
653 		free(subpath);
654 		got_object_tree_close(subtree);
655 		if (err)
656 			return err;
657 	}
658 
659 	*next = SIMPLEQ_NEXT(te, entry);
660 	return NULL;
661 }
662 
663 static const struct got_error *
664 diff_fileindex_tree(struct got_fileindex *fileindex,
665     struct got_fileindex_entry **ie, struct got_tree_object *tree,
666     const char *path, const char *entry_name, struct got_repository *repo,
667     struct got_fileindex_diff_tree_cb *cb, void *cb_arg)
668 {
669 	const struct got_error *err = NULL;
670 	struct got_tree_entry *te = NULL;
671 	size_t path_len = strlen(path);
672 	const struct got_tree_entries *entries;
673 	struct got_fileindex_entry *next;
674 
675 	entries = got_object_tree_get_entries(tree);
676 	te = SIMPLEQ_FIRST(&entries->head);
677 	while ((*ie && got_path_is_child((*ie)->path, path, path_len)) || te) {
678 		if (te && *ie) {
679 			char *te_path;
680 			int cmp;
681 			if (asprintf(&te_path, "%s/%s", path, te->name) == -1) {
682 				err = got_error_from_errno("asprintf");
683 				break;
684 			}
685 			cmp = got_path_cmp((*ie)->path, te_path);
686 			free(te_path);
687 			if (cmp == 0) {
688 				if (got_path_is_child((*ie)->path, path,
689 				    path_len) && (entry_name == NULL ||
690 				    strcmp(te->name, entry_name) == 0)) {
691 					err = cb->diff_old_new(cb_arg, *ie, te,
692 					    path);
693 					if (err || entry_name)
694 						break;
695 				}
696 				*ie = walk_fileindex(fileindex, *ie);
697 				err = walk_tree(&te, fileindex, ie, te,
698 				    path, entry_name, repo, cb, cb_arg);
699 			} else if (cmp < 0) {
700 				next = walk_fileindex(fileindex, *ie);
701 				if (got_path_is_child((*ie)->path, path,
702 				    path_len) && (entry_name == NULL ||
703 				    strcmp(te->name, entry_name) == 0)) {
704 					err = cb->diff_old(cb_arg, *ie, path);
705 					if (err || entry_name)
706 						break;
707 				}
708 				*ie = next;
709 			} else {
710 				if ((entry_name == NULL ||
711 				    strcmp(te->name, entry_name) == 0)) {
712 					err = cb->diff_new(cb_arg, te, path);
713 					if (err || entry_name)
714 						break;
715 				}
716 				err = walk_tree(&te, fileindex, ie, te,
717 				    path, entry_name, repo, cb, cb_arg);
718 			}
719 			if (err)
720 				break;
721 		} else if (*ie) {
722 			next = walk_fileindex(fileindex, *ie);
723 			if (got_path_is_child((*ie)->path, path, path_len) &&
724 			    (entry_name == NULL ||
725 			    strcmp(te->name, entry_name) == 0)) {
726 				err = cb->diff_old(cb_arg, *ie, path);
727 				if (err || entry_name)
728 					break;
729 			}
730 			*ie = next;
731 		} else if (te) {
732 			if (entry_name == NULL ||
733 			    strcmp(te->name, entry_name) == 0) {
734 				err = cb->diff_new(cb_arg, te, path);
735 				if (err || entry_name)
736 					break;
737 			}
738 			err = walk_tree(&te, fileindex, ie, te, path,
739 			    entry_name, repo, cb, cb_arg);
740 			if (err)
741 				break;
742 		}
743 	}
744 
745 	return err;
746 }
747 
748 const struct got_error *
749 got_fileindex_diff_tree(struct got_fileindex *fileindex,
750     struct got_tree_object *tree, const char *path, const char *entry_name,
751     struct got_repository *repo,
752     struct got_fileindex_diff_tree_cb *cb, void *cb_arg)
753 {
754 	struct got_fileindex_entry *min;
755 	min = RB_MIN(got_fileindex_tree, &fileindex->entries);
756 	return diff_fileindex_tree(fileindex, &min, tree, path, entry_name,
757 	    repo, cb, cb_arg);
758 }
759 
760 static const struct got_error *
761 diff_fileindex_dir(struct got_fileindex *, struct got_fileindex_entry **, DIR *,
762     const char *, const char *, struct got_repository *,
763     struct got_fileindex_diff_dir_cb *, void *);
764 
765 static const struct got_error *
766 walk_dir(struct got_pathlist_entry **next, struct got_fileindex *fileindex,
767     struct got_fileindex_entry **ie, struct got_pathlist_entry *dle,
768     const char *path, DIR *dir, const char *rootpath,
769     struct got_repository *repo, struct got_fileindex_diff_dir_cb *cb,
770     void *cb_arg)
771 {
772 	const struct got_error *err = NULL;
773 	struct dirent *de = dle->data;
774 
775 	*next = NULL;
776 
777 	if (de->d_type == DT_DIR) {
778 		char *subpath;
779 		char *subdirpath;
780 		DIR *subdir;
781 
782 		if (asprintf(&subpath, "%s%s%s", path,
783 		    path[0] == '\0' ? "" : "/", de->d_name) == -1)
784 			return got_error_from_errno("asprintf");
785 
786 		if (asprintf(&subdirpath, "%s/%s", rootpath, subpath) == -1) {
787 			free(subpath);
788 			return got_error_from_errno("asprintf");
789 		}
790 
791 		subdir = opendir(subdirpath);
792 		if (subdir == NULL) {
793 			free(subpath);
794 			free(subdirpath);
795 			return got_error_from_errno2("opendir", subdirpath);
796 		}
797 
798 		err = diff_fileindex_dir(fileindex, ie, subdir, rootpath,
799 		    subpath, repo, cb, cb_arg);
800 		free(subpath);
801 		free(subdirpath);
802 		closedir(subdir);
803 		if (err)
804 			return err;
805 	}
806 
807 	*next = TAILQ_NEXT(dle, entry);
808 	return NULL;
809 }
810 
811 static const struct got_error *
812 diff_fileindex_dir(struct got_fileindex *fileindex,
813     struct got_fileindex_entry **ie, DIR *dir, const char *rootpath,
814     const char *path, struct got_repository *repo,
815     struct got_fileindex_diff_dir_cb *cb, void *cb_arg)
816 {
817 	const struct got_error *err = NULL;
818 	struct dirent *de = NULL;
819 	size_t path_len = strlen(path);
820 	struct got_fileindex_entry *next;
821 	struct got_pathlist_head dirlist;
822 	struct got_pathlist_entry *dle;
823 
824 	TAILQ_INIT(&dirlist);
825 
826 	for (;;) {
827 		struct got_pathlist_entry *new = NULL;
828 		struct dirent *dep = NULL;
829 
830 		de = malloc(sizeof(struct dirent) + NAME_MAX + 1);
831 		if (de == NULL) {
832 			err = got_error_from_errno("malloc");
833 			goto done;
834 		}
835 
836 		if (readdir_r(dir, de, &dep) != 0) {
837 			err = got_error_from_errno("readdir_r");
838 			free(de);
839 			goto done;
840 		}
841 		if (dep == NULL) {
842 			free(de);
843 			break;
844 		}
845 
846 		if (strcmp(de->d_name, ".") == 0 ||
847 		    strcmp(de->d_name, "..") == 0 ||
848 		    (path[0] == '\0' &&
849 		    strcmp(de->d_name, GOT_WORKTREE_GOT_DIR) == 0)) {
850 			free(de);
851 			continue;
852 		}
853 
854 		err = got_pathlist_insert(&new, &dirlist, de->d_name, de);
855 		if (err) {
856 			free(de);
857 			goto done;
858 		}
859 		if (new == NULL) {
860 			err = got_error(GOT_ERR_DIR_DUP_ENTRY);
861 			free(de);
862 			goto done;
863 		}
864 	}
865 
866 	dle = TAILQ_FIRST(&dirlist);
867 	while ((*ie && got_path_is_child((*ie)->path, path, path_len)) || dle) {
868 		if (dle && *ie) {
869 			char *de_path;
870 			int cmp;
871 			de = dle->data;
872 			if (asprintf(&de_path, "%s/%s", path,
873 			    de->d_name) == -1) {
874 				err = got_error_from_errno("asprintf");
875 				break;
876 			}
877 			cmp = got_path_cmp((*ie)->path, de_path);
878 			free(de_path);
879 			if (cmp == 0) {
880 				err = cb->diff_old_new(cb_arg, *ie, de, path);
881 				if (err)
882 					break;
883 				*ie = walk_fileindex(fileindex, *ie);
884 				err = walk_dir(&dle, fileindex, ie, dle, path,
885 				    dir, rootpath, repo, cb, cb_arg);
886 			} else if (cmp < 0 ) {
887 				next = walk_fileindex(fileindex, *ie);
888 				err = cb->diff_old(cb_arg, *ie, path);
889 				if (err)
890 					break;
891 				*ie = next;
892 			} else {
893 				err = cb->diff_new(cb_arg, de, path);
894 				if (err)
895 					break;
896 				err = walk_dir(&dle, fileindex, ie, dle, path,
897 				    dir, rootpath, repo, cb, cb_arg);
898 			}
899 			if (err)
900 				break;
901 		} else if (*ie) {
902 			next = walk_fileindex(fileindex, *ie);
903 			err = cb->diff_old(cb_arg, *ie, path);
904 			if (err)
905 				break;
906 			*ie = next;
907 		} else if (dle) {
908 			de = dle->data;
909 			err = cb->diff_new(cb_arg, de, path);
910 			if (err)
911 				break;
912 			err = walk_dir(&dle, fileindex, ie, dle, path, dir,
913 			    rootpath, repo, cb, cb_arg);
914 			if (err)
915 				break;
916 		}
917 	}
918 done:
919 	TAILQ_FOREACH(dle, &dirlist, entry)
920 		free(dle->data);
921 	got_pathlist_free(&dirlist);
922 	return err;
923 }
924 
925 const struct got_error *
926 got_fileindex_diff_dir(struct got_fileindex *fileindex, DIR *rootdir,
927     const char *rootpath, const char *path, struct got_repository *repo,
928     struct got_fileindex_diff_dir_cb *cb, void *cb_arg)
929 {
930 	struct got_fileindex_entry *min;
931 	min = RB_MIN(got_fileindex_tree, &fileindex->entries);
932 	return diff_fileindex_dir(fileindex, &min, rootdir, rootpath, path,
933 	    repo, cb, cb_arg);
934 }
935 
936 RB_GENERATE(got_fileindex_tree, got_fileindex_entry, entry, got_fileindex_cmp);