summaryrefslogtreecommitdiff
path: root/builtin-update-index.c
blob: 71cef633c0e36b3a33fa29eccb8579a9304b0777 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
/*
 * GIT - The information manager from hell
 *
 * Copyright (C) Linus Torvalds, 2005
 */
#include "cache.h"
#include "strbuf.h"
#include "quote.h"
#include "cache-tree.h"
#include "tree-walk.h"
#include "builtin.h"

/*
 * Default to not allowing changes to the list of files. The
 * tool doesn't actually care, but this makes it harder to add
 * files to the revision control by mistake by doing something
 * like "git-update-index *" and suddenly having all the object
 * files be revision controlled.
 */
static int allow_add;
static int allow_remove;
static int allow_replace;
static int info_only;
static int force_remove;
static int verbose;
static int mark_valid_only;
#define MARK_VALID 1
#define UNMARK_VALID 2

static void report(const char *fmt, ...)
{
	va_list vp;

	if (!verbose)
		return;

	va_start(vp, fmt);
	vprintf(fmt, vp);
	putchar('\n');
	va_end(vp);
}

static int mark_valid(const char *path)
{
	int namelen = strlen(path);
	int pos = cache_name_pos(path, namelen);
	if (0 <= pos) {
		switch (mark_valid_only) {
		case MARK_VALID:
			active_cache[pos]->ce_flags |= htons(CE_VALID);
			break;
		case UNMARK_VALID:
			active_cache[pos]->ce_flags &= ~htons(CE_VALID);
			break;
		}
		cache_tree_invalidate_path(active_cache_tree, path);
		active_cache_changed = 1;
		return 0;
	}
	return -1;
}

static int add_file_to_cache(const char *path)
{
	int size, namelen, option, status;
	struct cache_entry *ce;
	struct stat st;

	status = lstat(path, &st);

	/* We probably want to do this in remove_file_from_cache() and
	 * add_cache_entry() instead...
	 */
	cache_tree_invalidate_path(active_cache_tree, path);

	if (status < 0 || S_ISDIR(st.st_mode)) {
		/* When we used to have "path" and now we want to add
		 * "path/file", we need a way to remove "path" before
		 * being able to add "path/file".  However,
		 * "git-update-index --remove path" would not work.
		 * --force-remove can be used but this is more user
		 * friendly, especially since we can do the opposite
		 * case just fine without --force-remove.
		 */
		if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
			if (allow_remove) {
				if (remove_file_from_cache(path))
					return error("%s: cannot remove from the index",
					             path);
				else
					return 0;
			} else if (status < 0) {
				return error("%s: does not exist and --remove not passed",
				             path);
			}
		}
		if (0 == status)
			return error("%s: is a directory - add files inside instead",
			             path);
		else
			return error("lstat(\"%s\"): %s", path,
				     strerror(errno));
	}

	namelen = strlen(path);
	size = cache_entry_size(namelen);
	ce = xcalloc(1, size);
	memcpy(ce->name, path, namelen);
	ce->ce_flags = htons(namelen);
	fill_stat_cache_info(ce, &st);

	if (trust_executable_bit && has_symlinks)
		ce->ce_mode = create_ce_mode(st.st_mode);
	else {
		/* If there is an existing entry, pick the mode bits and type
		 * from it, otherwise assume unexecutable regular file.
		 */
		struct cache_entry *ent;
		int pos = cache_name_pos(path, namelen);

		ent = (0 <= pos) ? active_cache[pos] : NULL;
		ce->ce_mode = ce_mode_from_stat(ent, st.st_mode);
	}

	if (index_path(ce->sha1, path, &st, !info_only))
		return -1;
	option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
	option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
	if (add_cache_entry(ce, option))
		return error("%s: cannot add to the index - missing --add option?",
			     path);
	return 0;
}

static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
			 const char *path, int stage)
{
	int size, len, option;
	struct cache_entry *ce;

	if (!verify_path(path))
		return -1;

	len = strlen(path);
	size = cache_entry_size(len);
	ce = xcalloc(1, size);

	hashcpy(ce->sha1, sha1);
	memcpy(ce->name, path, len);
	ce->ce_flags = create_ce_flags(len, stage);
	ce->ce_mode = create_ce_mode(mode);
	if (assume_unchanged)
		ce->ce_flags |= htons(CE_VALID);
	option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
	option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
	if (add_cache_entry(ce, option))
		return error("%s: cannot add to the index - missing --add option?",
			     path);
	report("add '%s'", path);
	cache_tree_invalidate_path(active_cache_tree, path);
	return 0;
}

static void chmod_path(int flip, const char *path)
{
	int pos;
	struct cache_entry *ce;
	unsigned int mode;

	pos = cache_name_pos(path, strlen(path));
	if (pos < 0)
		goto fail;
	ce = active_cache[pos];
	mode = ntohl(ce->ce_mode);
	if (!S_ISREG(mode))
		goto fail;
	switch (flip) {
	case '+':
		ce->ce_mode |= htonl(0111); break;
	case '-':
		ce->ce_mode &= htonl(~0111); break;
	default:
		goto fail;
	}
	cache_tree_invalidate_path(active_cache_tree, path);
	active_cache_changed = 1;
	report("chmod %cx '%s'", flip, path);
	return;
 fail:
	die("git-update-index: cannot chmod %cx '%s'", flip, path);
}

static void update_one(const char *path, const char *prefix, int prefix_length)
{
	const char *p = prefix_path(prefix, prefix_length, path);
	if (!verify_path(p)) {
		fprintf(stderr, "Ignoring path %s\n", path);
		goto free_return;
	}
	if (mark_valid_only) {
		if (mark_valid(p))
			die("Unable to mark file %s", path);
		goto free_return;
	}
	cache_tree_invalidate_path(active_cache_tree, path);

	if (force_remove) {
		if (remove_file_from_cache(p))
			die("git-update-index: unable to remove %s", path);
		report("remove '%s'", path);
		goto free_return;
	}
	if (add_file_to_cache(p))
		die("Unable to process file %s", path);
	report("add '%s'", path);
 free_return:
	if (p < path || p > path + strlen(path))
		free((char*)p);
}

static void read_index_info(int line_termination)
{
	struct strbuf buf;
	strbuf_init(&buf);
	while (1) {
		char *ptr, *tab;
		char *path_name;
		unsigned char sha1[20];
		unsigned int mode;
		int stage;

		/* This reads lines formatted in one of three formats:
		 *
		 * (1) mode         SP sha1          TAB path
		 * The first format is what "git-apply --index-info"
		 * reports, and used to reconstruct a partial tree
		 * that is used for phony merge base tree when falling
		 * back on 3-way merge.
		 *
		 * (2) mode SP type SP sha1          TAB path
		 * The second format is to stuff git-ls-tree output
		 * into the index file.
		 *
		 * (3) mode         SP sha1 SP stage TAB path
		 * This format is to put higher order stages into the
		 * index file and matches git-ls-files --stage output.
		 */
		read_line(&buf, stdin, line_termination);
		if (buf.eof)
			break;

		mode = strtoul(buf.buf, &ptr, 8);
		if (ptr == buf.buf || *ptr != ' ')
			goto bad_line;

		tab = strchr(ptr, '\t');
		if (!tab || tab - ptr < 41)
			goto bad_line;

		if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
			stage = tab[-1] - '0';
			ptr = tab + 1; /* point at the head of path */
			tab = tab - 2; /* point at tail of sha1 */
		}
		else {
			stage = 0;
			ptr = tab + 1; /* point at the head of path */
		}

		if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
			goto bad_line;

		if (line_termination && ptr[0] == '"')
			path_name = unquote_c_style(ptr, NULL);
		else
			path_name = ptr;

		if (!verify_path(path_name)) {
			fprintf(stderr, "Ignoring path %s\n", path_name);
			if (path_name != ptr)
				free(path_name);
			continue;
		}
		cache_tree_invalidate_path(active_cache_tree, path_name);

		if (!mode) {
			/* mode == 0 means there is no such path -- remove */
			if (remove_file_from_cache(path_name))
				die("git-update-index: unable to remove %s",
				    ptr);
		}
		else {
			/* mode ' ' sha1 '\t' name
			 * ptr[-1] points at tab,
			 * ptr[-41] is at the beginning of sha1
			 */
			ptr[-42] = ptr[-1] = 0;
			if (add_cacheinfo(mode, sha1, path_name, stage))
				die("git-update-index: unable to update %s",
				    path_name);
		}
		if (path_name != ptr)
			free(path_name);
		continue;

	bad_line:
		die("malformed index info %s", buf.buf);
	}
}

static const char update_index_usage[] =
"git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--really-refresh] [--cacheinfo] [--chmod=(+|-)x] [--assume-unchanged] [--info-only] [--force-remove] [--stdin] [--index-info] [--unresolve] [--again | -g] [--ignore-missing] [-z] [--verbose] [--] <file>...";

static unsigned char head_sha1[20];
static unsigned char merge_head_sha1[20];

static struct cache_entry *read_one_ent(const char *which,
					unsigned char *ent, const char *path,
					int namelen, int stage)
{
	unsigned mode;
	unsigned char sha1[20];
	int size;
	struct cache_entry *ce;

	if (get_tree_entry(ent, path, sha1, &mode)) {
		if (which)
			error("%s: not in %s branch.", path, which);
		return NULL;
	}
	if (mode == S_IFDIR) {
		if (which)
			error("%s: not a blob in %s branch.", path, which);
		return NULL;
	}
	size = cache_entry_size(namelen);
	ce = xcalloc(1, size);

	hashcpy(ce->sha1, sha1);
	memcpy(ce->name, path, namelen);
	ce->ce_flags = create_ce_flags(namelen, stage);
	ce->ce_mode = create_ce_mode(mode);
	return ce;
}

static int unresolve_one(const char *path)
{
	int namelen = strlen(path);
	int pos;
	int ret = 0;
	struct cache_entry *ce_2 = NULL, *ce_3 = NULL;

	/* See if there is such entry in the index. */
	pos = cache_name_pos(path, namelen);
	if (pos < 0) {
		/* If there isn't, either it is unmerged, or
		 * resolved as "removed" by mistake.  We do not
		 * want to do anything in the former case.
		 */
		pos = -pos-1;
		if (pos < active_nr) {
			struct cache_entry *ce = active_cache[pos];
			if (ce_namelen(ce) == namelen &&
			    !memcmp(ce->name, path, namelen)) {
				fprintf(stderr,
					"%s: skipping still unmerged path.\n",
					path);
				goto free_return;
			}
		}
	}

	/* Grab blobs from given path from HEAD and MERGE_HEAD,
	 * stuff HEAD version in stage #2,
	 * stuff MERGE_HEAD version in stage #3.
	 */
	ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
	ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);

	if (!ce_2 || !ce_3) {
		ret = -1;
		goto free_return;
	}
	if (!hashcmp(ce_2->sha1, ce_3->sha1) &&
	    ce_2->ce_mode == ce_3->ce_mode) {
		fprintf(stderr, "%s: identical in both, skipping.\n",
			path);
		goto free_return;
	}

	cache_tree_invalidate_path(active_cache_tree, path);
	remove_file_from_cache(path);
	if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
		error("%s: cannot add our version to the index.", path);
		ret = -1;
		goto free_return;
	}
	if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
		return 0;
	error("%s: cannot add their version to the index.", path);
	ret = -1;
 free_return:
	free(ce_2);
	free(ce_3);
	return ret;
}

static void read_head_pointers(void)
{
	if (read_ref("HEAD", head_sha1))
		die("No HEAD -- no initial commit yet?\n");
	if (read_ref("MERGE_HEAD", merge_head_sha1)) {
		fprintf(stderr, "Not in the middle of a merge.\n");
		exit(0);
	}
}

static int do_unresolve(int ac, const char **av,
			const char *prefix, int prefix_length)
{
	int i;
	int err = 0;

	/* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
	 * are not doing a merge, so exit with success status.
	 */
	read_head_pointers();

	for (i = 1; i < ac; i++) {
		const char *arg = av[i];
		const char *p = prefix_path(prefix, prefix_length, arg);
		err |= unresolve_one(p);
		if (p < arg || p > arg + strlen(arg))
			free((char*)p);
	}
	return err;
}

static int do_reupdate(int ac, const char **av,
		       const char *prefix, int prefix_length)
{
	/* Read HEAD and run update-index on paths that are
	 * merged and already different between index and HEAD.
	 */
	int pos;
	int has_head = 1;
	const char **pathspec = get_pathspec(prefix, av + 1);

	if (read_ref("HEAD", head_sha1))
		/* If there is no HEAD, that means it is an initial
		 * commit.  Update everything in the index.
		 */
		has_head = 0;
 redo:
	for (pos = 0; pos < active_nr; pos++) {
		struct cache_entry *ce = active_cache[pos];
		struct cache_entry *old = NULL;
		int save_nr;

		if (ce_stage(ce) || !ce_path_match(ce, pathspec))
			continue;
		if (has_head)
			old = read_one_ent(NULL, head_sha1,
					   ce->name, ce_namelen(ce), 0);
		if (old && ce->ce_mode == old->ce_mode &&
		    !hashcmp(ce->sha1, old->sha1)) {
			free(old);
			continue; /* unchanged */
		}
		/* Be careful.  The working tree may not have the
		 * path anymore, in which case, under 'allow_remove',
		 * or worse yet 'allow_replace', active_nr may decrease.
		 */
		save_nr = active_nr;
		update_one(ce->name + prefix_length, prefix, prefix_length);
		if (save_nr != active_nr)
			goto redo;
	}
	return 0;
}

int cmd_update_index(int argc, const char **argv, const char *prefix)
{
	int i, newfd, entries, has_errors = 0, line_termination = '\n';
	int allow_options = 1;
	int read_from_stdin = 0;
	int prefix_length = prefix ? strlen(prefix) : 0;
	char set_executable_bit = 0;
	unsigned int refresh_flags = 0;
	int lock_error = 0;
	struct lock_file *lock_file;

	git_config(git_default_config);

	/* We can't free this memory, it becomes part of a linked list parsed atexit() */
	lock_file = xcalloc(1, sizeof(struct lock_file));

	newfd = hold_lock_file_for_update(lock_file, get_index_file(), 0);
	if (newfd < 0)
		lock_error = errno;

	entries = read_cache();
	if (entries < 0)
		die("cache corrupted");

	for (i = 1 ; i < argc; i++) {
		const char *path = argv[i];
		const char *p;

		if (allow_options && *path == '-') {
			if (!strcmp(path, "--")) {
				allow_options = 0;
				continue;
			}
			if (!strcmp(path, "-q")) {
				refresh_flags |= REFRESH_QUIET;
				continue;
			}
			if (!strcmp(path, "--add")) {
				allow_add = 1;
				continue;
			}
			if (!strcmp(path, "--replace")) {
				allow_replace = 1;
				continue;
			}
			if (!strcmp(path, "--remove")) {
				allow_remove = 1;
				continue;
			}
			if (!strcmp(path, "--unmerged")) {
				refresh_flags |= REFRESH_UNMERGED;
				continue;
			}
			if (!strcmp(path, "--refresh")) {
				has_errors |= refresh_cache(refresh_flags);
				continue;
			}
			if (!strcmp(path, "--really-refresh")) {
				has_errors |= refresh_cache(REFRESH_REALLY | refresh_flags);
				continue;
			}
			if (!strcmp(path, "--cacheinfo")) {
				unsigned char sha1[20];
				unsigned int mode;

				if (i+3 >= argc)
					die("git-update-index: --cacheinfo <mode> <sha1> <path>");

				if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
				    get_sha1_hex(argv[i+2], sha1) ||
				    add_cacheinfo(mode, sha1, argv[i+3], 0))
					die("git-update-index: --cacheinfo"
					    " cannot add %s", argv[i+3]);
				i += 3;
				continue;
			}
			if (!strcmp(path, "--chmod=-x") ||
			    !strcmp(path, "--chmod=+x")) {
				if (argc <= i+1)
					die("git-update-index: %s <path>", path);
				set_executable_bit = path[8];
				continue;
			}
			if (!strcmp(path, "--assume-unchanged")) {
				mark_valid_only = MARK_VALID;
				continue;
			}
			if (!strcmp(path, "--no-assume-unchanged")) {
				mark_valid_only = UNMARK_VALID;
				continue;
			}
			if (!strcmp(path, "--info-only")) {
				info_only = 1;
				continue;
			}
			if (!strcmp(path, "--force-remove")) {
				force_remove = 1;
				continue;
			}
			if (!strcmp(path, "-z")) {
				line_termination = 0;
				continue;
			}
			if (!strcmp(path, "--stdin")) {
				if (i != argc - 1)
					die("--stdin must be at the end");
				read_from_stdin = 1;
				break;
			}
			if (!strcmp(path, "--index-info")) {
				if (i != argc - 1)
					die("--index-info must be at the end");
				allow_add = allow_replace = allow_remove = 1;
				read_index_info(line_termination);
				break;
			}
			if (!strcmp(path, "--unresolve")) {
				has_errors = do_unresolve(argc - i, argv + i,
							  prefix, prefix_length);
				if (has_errors)
					active_cache_changed = 0;
				goto finish;
			}
			if (!strcmp(path, "--again") || !strcmp(path, "-g")) {
				has_errors = do_reupdate(argc - i, argv + i,
							 prefix, prefix_length);
				if (has_errors)
					active_cache_changed = 0;
				goto finish;
			}
			if (!strcmp(path, "--ignore-missing")) {
				refresh_flags |= REFRESH_IGNORE_MISSING;
				continue;
			}
			if (!strcmp(path, "--verbose")) {
				verbose = 1;
				continue;
			}
			if (!strcmp(path, "-h") || !strcmp(path, "--help"))
				usage(update_index_usage);
			die("unknown option %s", path);
		}
		p = prefix_path(prefix, prefix_length, path);
		update_one(p, NULL, 0);
		if (set_executable_bit)
			chmod_path(set_executable_bit, p);
		if (p < path || p > path + strlen(path))
			free((char*)p);
	}
	if (read_from_stdin) {
		struct strbuf buf;
		strbuf_init(&buf);
		while (1) {
			char *path_name;
			const char *p;
			read_line(&buf, stdin, line_termination);
			if (buf.eof)
				break;
			if (line_termination && buf.buf[0] == '"')
				path_name = unquote_c_style(buf.buf, NULL);
			else
				path_name = buf.buf;
			p = prefix_path(prefix, prefix_length, path_name);
			update_one(p, NULL, 0);
			if (set_executable_bit)
				chmod_path(set_executable_bit, p);
			if (p < path_name || p > path_name + strlen(path_name))
				free((char*) p);
			if (path_name != buf.buf)
				free(path_name);
		}
	}

 finish:
	if (active_cache_changed) {
		if (newfd < 0) {
			if (refresh_flags & REFRESH_QUIET)
				exit(128);
			die("unable to create '%s.lock': %s",
			    get_index_file(), strerror(lock_error));
		}
		if (write_cache(newfd, active_cache, active_nr) ||
		    close(newfd) || commit_lock_file(lock_file))
			die("Unable to write new index file");
	}

	rollback_lock_file(lock_file);

	return has_errors ? 1 : 0;
}