aboutsummaryrefslogtreecommitdiff
path: root/submodule-config.c
blob: 2aa8a1747f8586839aa3036fbbc59f6c716c6128 (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
#include "cache.h"
#include "repository.h"
#include "config.h"
#include "submodule-config.h"
#include "submodule.h"
#include "strbuf.h"
#include "parse-options.h"

/*
 * submodule cache lookup structure
 * There is one shared set of 'struct submodule' entries which can be
 * looked up by their sha1 blob id of the .gitmodule file and either
 * using path or name as key.
 * for_path stores submodule entries with path as key
 * for_name stores submodule entries with name as key
 */
struct submodule_cache {
	struct hashmap for_path;
	struct hashmap for_name;
	unsigned initialized:1;
	unsigned gitmodules_read:1;
};

/*
 * thin wrapper struct needed to insert 'struct submodule' entries to
 * the hashmap
 */
struct submodule_entry {
	struct hashmap_entry ent;
	struct submodule *config;
};

enum lookup_type {
	lookup_name,
	lookup_path
};

static int config_path_cmp(const void *unused_cmp_data,
			   const void *entry,
			   const void *entry_or_key,
			   const void *unused_keydata)
{
	const struct submodule_entry *a = entry;
	const struct submodule_entry *b = entry_or_key;

	return strcmp(a->config->path, b->config->path) ||
	       hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
}

static int config_name_cmp(const void *unused_cmp_data,
			   const void *entry,
			   const void *entry_or_key,
			   const void *unused_keydata)
{
	const struct submodule_entry *a = entry;
	const struct submodule_entry *b = entry_or_key;

	return strcmp(a->config->name, b->config->name) ||
	       hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
}

static struct submodule_cache *submodule_cache_alloc(void)
{
	return xcalloc(1, sizeof(struct submodule_cache));
}

static void submodule_cache_init(struct submodule_cache *cache)
{
	hashmap_init(&cache->for_path, config_path_cmp, NULL, 0);
	hashmap_init(&cache->for_name, config_name_cmp, NULL, 0);
	cache->initialized = 1;
}

static void free_one_config(struct submodule_entry *entry)
{
	free((void *) entry->config->path);
	free((void *) entry->config->name);
	free((void *) entry->config->branch);
	free((void *) entry->config->update_strategy.command);
	free(entry->config);
}

static void submodule_cache_clear(struct submodule_cache *cache)
{
	struct hashmap_iter iter;
	struct submodule_entry *entry;

	if (!cache->initialized)
		return;

	/*
	 * We iterate over the name hash here to be symmetric with the
	 * allocation of struct submodule entries. Each is allocated by
	 * their .gitmodule blob sha1 and submodule name.
	 */
	hashmap_iter_init(&cache->for_name, &iter);
	while ((entry = hashmap_iter_next(&iter)))
		free_one_config(entry);

	hashmap_free(&cache->for_path, 1);
	hashmap_free(&cache->for_name, 1);
	cache->initialized = 0;
	cache->gitmodules_read = 0;
}

void submodule_cache_free(struct submodule_cache *cache)
{
	submodule_cache_clear(cache);
	free(cache);
}

static unsigned int hash_sha1_string(const unsigned char *sha1,
				     const char *string)
{
	return memhash(sha1, 20) + strhash(string);
}

static void cache_put_path(struct submodule_cache *cache,
			   struct submodule *submodule)
{
	unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
					     submodule->path);
	struct submodule_entry *e = xmalloc(sizeof(*e));
	hashmap_entry_init(e, hash);
	e->config = submodule;
	hashmap_put(&cache->for_path, e);
}

static void cache_remove_path(struct submodule_cache *cache,
			      struct submodule *submodule)
{
	unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
					     submodule->path);
	struct submodule_entry e;
	struct submodule_entry *removed;
	hashmap_entry_init(&e, hash);
	e.config = submodule;
	removed = hashmap_remove(&cache->for_path, &e, NULL);
	free(removed);
}

static void cache_add(struct submodule_cache *cache,
		      struct submodule *submodule)
{
	unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
					     submodule->name);
	struct submodule_entry *e = xmalloc(sizeof(*e));
	hashmap_entry_init(e, hash);
	e->config = submodule;
	hashmap_add(&cache->for_name, e);
}

static const struct submodule *cache_lookup_path(struct submodule_cache *cache,
		const unsigned char *gitmodules_sha1, const char *path)
{
	struct submodule_entry *entry;
	unsigned int hash = hash_sha1_string(gitmodules_sha1, path);
	struct submodule_entry key;
	struct submodule key_config;

	hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
	key_config.path = path;

	hashmap_entry_init(&key, hash);
	key.config = &key_config;

	entry = hashmap_get(&cache->for_path, &key, NULL);
	if (entry)
		return entry->config;
	return NULL;
}

static struct submodule *cache_lookup_name(struct submodule_cache *cache,
		const unsigned char *gitmodules_sha1, const char *name)
{
	struct submodule_entry *entry;
	unsigned int hash = hash_sha1_string(gitmodules_sha1, name);
	struct submodule_entry key;
	struct submodule key_config;

	hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
	key_config.name = name;

	hashmap_entry_init(&key, hash);
	key.config = &key_config;

	entry = hashmap_get(&cache->for_name, &key, NULL);
	if (entry)
		return entry->config;
	return NULL;
}

static int name_and_item_from_var(const char *var, struct strbuf *name,
				  struct strbuf *item)
{
	const char *subsection, *key;
	int subsection_len, parse;
	parse = parse_config_key(var, "submodule", &subsection,
			&subsection_len, &key);
	if (parse < 0 || !subsection)
		return 0;

	strbuf_add(name, subsection, subsection_len);
	strbuf_addstr(item, key);

	return 1;
}

static struct submodule *lookup_or_create_by_name(struct submodule_cache *cache,
		const unsigned char *gitmodules_sha1, const char *name)
{
	struct submodule *submodule;
	struct strbuf name_buf = STRBUF_INIT;

	submodule = cache_lookup_name(cache, gitmodules_sha1, name);
	if (submodule)
		return submodule;

	submodule = xmalloc(sizeof(*submodule));

	strbuf_addstr(&name_buf, name);
	submodule->name = strbuf_detach(&name_buf, NULL);

	submodule->path = NULL;
	submodule->url = NULL;
	submodule->update_strategy.type = SM_UPDATE_UNSPECIFIED;
	submodule->update_strategy.command = NULL;
	submodule->fetch_recurse = RECURSE_SUBMODULES_NONE;
	submodule->ignore = NULL;
	submodule->branch = NULL;
	submodule->recommend_shallow = -1;

	hashcpy(submodule->gitmodules_sha1, gitmodules_sha1);

	cache_add(cache, submodule);

	return submodule;
}

static int parse_fetch_recurse(const char *opt, const char *arg,
			       int die_on_error)
{
	switch (git_parse_maybe_bool(arg)) {
	case 1:
		return RECURSE_SUBMODULES_ON;
	case 0:
		return RECURSE_SUBMODULES_OFF;
	default:
		if (!strcmp(arg, "on-demand"))
			return RECURSE_SUBMODULES_ON_DEMAND;

		if (die_on_error)
			die("bad %s argument: %s", opt, arg);
		else
			return RECURSE_SUBMODULES_ERROR;
	}
}

int parse_submodule_fetchjobs(const char *var, const char *value)
{
	int fetchjobs = git_config_int(var, value);
	if (fetchjobs < 0)
		die(_("negative values not allowed for submodule.fetchjobs"));
	return fetchjobs;
}

int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
{
	return parse_fetch_recurse(opt, arg, 1);
}

int option_fetch_parse_recurse_submodules(const struct option *opt,
					  const char *arg, int unset)
{
	int *v;

	if (!opt->value)
		return -1;

	v = opt->value;

	if (unset) {
		*v = RECURSE_SUBMODULES_OFF;
	} else {
		if (arg)
			*v = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
		else
			*v = RECURSE_SUBMODULES_ON;
	}
	return 0;
}

static int parse_update_recurse(const char *opt, const char *arg,
				int die_on_error)
{
	switch (git_parse_maybe_bool(arg)) {
	case 1:
		return RECURSE_SUBMODULES_ON;
	case 0:
		return RECURSE_SUBMODULES_OFF;
	default:
		if (die_on_error)
			die("bad %s argument: %s", opt, arg);
		return RECURSE_SUBMODULES_ERROR;
	}
}

int parse_update_recurse_submodules_arg(const char *opt, const char *arg)
{
	return parse_update_recurse(opt, arg, 1);
}

static int parse_push_recurse(const char *opt, const char *arg,
			       int die_on_error)
{
	switch (git_parse_maybe_bool(arg)) {
	case 1:
		/* There's no simple "on" value when pushing */
		if (die_on_error)
			die("bad %s argument: %s", opt, arg);
		else
			return RECURSE_SUBMODULES_ERROR;
	case 0:
		return RECURSE_SUBMODULES_OFF;
	default:
		if (!strcmp(arg, "on-demand"))
			return RECURSE_SUBMODULES_ON_DEMAND;
		else if (!strcmp(arg, "check"))
			return RECURSE_SUBMODULES_CHECK;
		else if (!strcmp(arg, "only"))
			return RECURSE_SUBMODULES_ONLY;
		else if (die_on_error)
			die("bad %s argument: %s", opt, arg);
		else
			return RECURSE_SUBMODULES_ERROR;
	}
}

int parse_push_recurse_submodules_arg(const char *opt, const char *arg)
{
	return parse_push_recurse(opt, arg, 1);
}

static void warn_multiple_config(const unsigned char *treeish_name,
				 const char *name, const char *option)
{
	const char *commit_string = "WORKTREE";
	if (treeish_name)
		commit_string = sha1_to_hex(treeish_name);
	warning("%s:.gitmodules, multiple configurations found for "
			"'submodule.%s.%s'. Skipping second one!",
			commit_string, name, option);
}

struct parse_config_parameter {
	struct submodule_cache *cache;
	const unsigned char *treeish_name;
	const unsigned char *gitmodules_sha1;
	int overwrite;
};

static int parse_config(const char *var, const char *value, void *data)
{
	struct parse_config_parameter *me = data;
	struct submodule *submodule;
	struct strbuf name = STRBUF_INIT, item = STRBUF_INIT;
	int ret = 0;

	/* this also ensures that we only parse submodule entries */
	if (!name_and_item_from_var(var, &name, &item))
		return 0;

	submodule = lookup_or_create_by_name(me->cache,
					     me->gitmodules_sha1,
					     name.buf);

	if (!strcmp(item.buf, "path")) {
		if (!value)
			ret = config_error_nonbool(var);
		else if (!me->overwrite && submodule->path)
			warn_multiple_config(me->treeish_name, submodule->name,
					"path");
		else {
			if (submodule->path)
				cache_remove_path(me->cache, submodule);
			free((void *) submodule->path);
			submodule->path = xstrdup(value);
			cache_put_path(me->cache, submodule);
		}
	} else if (!strcmp(item.buf, "fetchrecursesubmodules")) {
		/* when parsing worktree configurations we can die early */
		int die_on_error = is_null_sha1(me->gitmodules_sha1);
		if (!me->overwrite &&
		    submodule->fetch_recurse != RECURSE_SUBMODULES_NONE)
			warn_multiple_config(me->treeish_name, submodule->name,
					"fetchrecursesubmodules");
		else
			submodule->fetch_recurse = parse_fetch_recurse(
								var, value,
								die_on_error);
	} else if (!strcmp(item.buf, "ignore")) {
		if (!value)
			ret = config_error_nonbool(var);
		else if (!me->overwrite && submodule->ignore)
			warn_multiple_config(me->treeish_name, submodule->name,
					"ignore");
		else if (strcmp(value, "untracked") &&
			 strcmp(value, "dirty") &&
			 strcmp(value, "all") &&
			 strcmp(value, "none"))
			warning("Invalid parameter '%s' for config option "
					"'submodule.%s.ignore'", value, name.buf);
		else {
			free((void *) submodule->ignore);
			submodule->ignore = xstrdup(value);
		}
	} else if (!strcmp(item.buf, "url")) {
		if (!value) {
			ret = config_error_nonbool(var);
		} else if (!me->overwrite && submodule->url) {
			warn_multiple_config(me->treeish_name, submodule->name,
					"url");
		} else {
			free((void *) submodule->url);
			submodule->url = xstrdup(value);
		}
	} else if (!strcmp(item.buf, "update")) {
		if (!value)
			ret = config_error_nonbool(var);
		else if (!me->overwrite &&
			 submodule->update_strategy.type != SM_UPDATE_UNSPECIFIED)
			warn_multiple_config(me->treeish_name, submodule->name,
					     "update");
		else if (parse_submodule_update_strategy(value,
			 &submodule->update_strategy) < 0)
				die(_("invalid value for %s"), var);
	} else if (!strcmp(item.buf, "shallow")) {
		if (!me->overwrite && submodule->recommend_shallow != -1)
			warn_multiple_config(me->treeish_name, submodule->name,
					     "shallow");
		else
			submodule->recommend_shallow =
				git_config_bool(var, value);
	} else if (!strcmp(item.buf, "branch")) {
		if (!me->overwrite && submodule->branch)
			warn_multiple_config(me->treeish_name, submodule->name,
					     "branch");
		else {
			free((void *)submodule->branch);
			submodule->branch = xstrdup(value);
		}
	}

	strbuf_release(&name);
	strbuf_release(&item);

	return ret;
}

static int gitmodule_oid_from_commit(const struct object_id *treeish_name,
				     struct object_id *gitmodules_oid,
				     struct strbuf *rev)
{
	int ret = 0;

	if (is_null_oid(treeish_name)) {
		oidclr(gitmodules_oid);
		return 1;
	}

	strbuf_addf(rev, "%s:.gitmodules", oid_to_hex(treeish_name));
	if (get_oid(rev->buf, gitmodules_oid) >= 0)
		ret = 1;

	return ret;
}

/* This does a lookup of a submodule configuration by name or by path
 * (key) with on-demand reading of the appropriate .gitmodules from
 * revisions.
 */
static const struct submodule *config_from(struct submodule_cache *cache,
		const struct object_id *treeish_name, const char *key,
		enum lookup_type lookup_type)
{
	struct strbuf rev = STRBUF_INIT;
	unsigned long config_size;
	char *config = NULL;
	struct object_id oid;
	enum object_type type;
	const struct submodule *submodule = NULL;
	struct parse_config_parameter parameter;

	/*
	 * If any parameter except the cache is a NULL pointer just
	 * return the first submodule. Can be used to check whether
	 * there are any submodules parsed.
	 */
	if (!treeish_name || !key) {
		struct hashmap_iter iter;
		struct submodule_entry *entry;

		entry = hashmap_iter_first(&cache->for_name, &iter);
		if (!entry)
			return NULL;
		return entry->config;
	}

	if (!gitmodule_oid_from_commit(treeish_name, &oid, &rev))
		goto out;

	switch (lookup_type) {
	case lookup_name:
		submodule = cache_lookup_name(cache, oid.hash, key);
		break;
	case lookup_path:
		submodule = cache_lookup_path(cache, oid.hash, key);
		break;
	}
	if (submodule)
		goto out;

	config = read_sha1_file(oid.hash, &type, &config_size);
	if (!config || type != OBJ_BLOB)
		goto out;

	/* fill the submodule config into the cache */
	parameter.cache = cache;
	parameter.treeish_name = treeish_name->hash;
	parameter.gitmodules_sha1 = oid.hash;
	parameter.overwrite = 0;
	git_config_from_mem(parse_config, CONFIG_ORIGIN_SUBMODULE_BLOB, rev.buf,
			config, config_size, &parameter);
	strbuf_release(&rev);
	free(config);

	switch (lookup_type) {
	case lookup_name:
		return cache_lookup_name(cache, oid.hash, key);
	case lookup_path:
		return cache_lookup_path(cache, oid.hash, key);
	default:
		return NULL;
	}

out:
	strbuf_release(&rev);
	free(config);
	return submodule;
}

static void submodule_cache_check_init(struct repository *repo)
{
	if (repo->submodule_cache && repo->submodule_cache->initialized)
		return;

	if (!repo->submodule_cache)
		repo->submodule_cache = submodule_cache_alloc();

	submodule_cache_init(repo->submodule_cache);
}

static int gitmodules_cb(const char *var, const char *value, void *data)
{
	struct repository *repo = data;
	struct parse_config_parameter parameter;

	parameter.cache = repo->submodule_cache;
	parameter.treeish_name = NULL;
	parameter.gitmodules_sha1 = null_sha1;
	parameter.overwrite = 1;

	return parse_config(var, value, &parameter);
}

void repo_read_gitmodules(struct repository *repo)
{
	submodule_cache_check_init(repo);

	if (repo->worktree) {
		char *gitmodules;

		if (repo_read_index(repo) < 0)
			return;

		gitmodules = repo_worktree_path(repo, GITMODULES_FILE);

		if (!is_gitmodules_unmerged(repo->index))
			git_config_from_file(gitmodules_cb, gitmodules, repo);

		free(gitmodules);
	}

	repo->submodule_cache->gitmodules_read = 1;
}

void gitmodules_config_oid(const struct object_id *commit_oid)
{
	struct strbuf rev = STRBUF_INIT;
	struct object_id oid;

	submodule_cache_check_init(the_repository);

	if (gitmodule_oid_from_commit(commit_oid, &oid, &rev)) {
		git_config_from_blob_oid(gitmodules_cb, rev.buf,
					 &oid, the_repository);
	}
	strbuf_release(&rev);

	the_repository->submodule_cache->gitmodules_read = 1;
}

static void gitmodules_read_check(struct repository *repo)
{
	submodule_cache_check_init(repo);

	/* read the repo's .gitmodules file if it hasn't been already */
	if (!repo->submodule_cache->gitmodules_read)
		repo_read_gitmodules(repo);
}

const struct submodule *submodule_from_name(const struct object_id *treeish_name,
		const char *name)
{
	gitmodules_read_check(the_repository);
	return config_from(the_repository->submodule_cache, treeish_name, name, lookup_name);
}

const struct submodule *submodule_from_path(const struct object_id *treeish_name,
		const char *path)
{
	gitmodules_read_check(the_repository);
	return config_from(the_repository->submodule_cache, treeish_name, path, lookup_path);
}

const struct submodule *submodule_from_cache(struct repository *repo,
					     const struct object_id *treeish_name,
					     const char *key)
{
	gitmodules_read_check(repo);
	return config_from(repo->submodule_cache, treeish_name,
			   key, lookup_path);
}

void submodule_free(void)
{
	if (the_repository->submodule_cache)
		submodule_cache_clear(the_repository->submodule_cache);
}