[thirdparty/git.git] / submodule-config.c

#include "cache.h"
#include "submodule-config.h"
#include "submodule.h"
#include "strbuf.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;
};

/*
 * 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 struct submodule_cache cache;
static int is_cache_init;

static int config_path_cmp(const struct submodule_entry *a,
			   const struct submodule_entry *b,
			   const void *unused)
{
	return strcmp(a->config->path, b->config->path) ||
	       hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
}

static int config_name_cmp(const struct submodule_entry *a,
			   const struct submodule_entry *b,
			   const void *unused)
{
	return strcmp(a->config->name, b->config->name) ||
	       hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
}

static void cache_init(struct submodule_cache *cache)
{
	hashmap_init(&cache->for_path, (hashmap_cmp_fn) config_path_cmp, 0);
	hashmap_init(&cache->for_name, (hashmap_cmp_fn) config_name_cmp, 0);
}

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

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

	/*
	 * 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);
}

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->fetch_recurse = RECURSE_SUBMODULES_NONE;
	submodule->ignore = NULL;

	hashcpy(submodule->gitmodules_sha1, gitmodules_sha1);

	cache_add(cache, submodule);

	return submodule;
}

static void warn_multiple_config(const unsigned char *commit_sha1,
				 const char *name, const char *option)
{
	const char *commit_string = "WORKTREE";
	if (commit_sha1)
		commit_string = sha1_to_hex(commit_sha1);
	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 *commit_sha1;
	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")) {
		struct strbuf path = STRBUF_INIT;
		if (!value) {
			ret = config_error_nonbool(var);
			goto release_return;
		}
		if (!me->overwrite && submodule->path != NULL) {
			warn_multiple_config(me->commit_sha1, submodule->name,
					"path");
			goto release_return;
		}

		if (submodule->path)
			cache_remove_path(me->cache, submodule);
		free((void *) submodule->path);
		strbuf_addstr(&path, value);
		submodule->path = strbuf_detach(&path, NULL);
		cache_put_path(me->cache, submodule);
	} else if (!strcmp(item.buf, "fetchrecursesubmodules")) {
		if (!me->overwrite &&
		    submodule->fetch_recurse != RECURSE_SUBMODULES_NONE) {
			warn_multiple_config(me->commit_sha1, submodule->name,
					"fetchrecursesubmodules");
			goto release_return;
		}

		submodule->fetch_recurse = parse_fetch_recurse_submodules_arg(var, value);
	} else if (!strcmp(item.buf, "ignore")) {
		struct strbuf ignore = STRBUF_INIT;
		if (!me->overwrite && submodule->ignore != NULL) {
			warn_multiple_config(me->commit_sha1, submodule->name,
					"ignore");
			goto release_return;
		}
		if (!value) {
			ret = config_error_nonbool(var);
			goto release_return;
		}
		if (strcmp(value, "untracked") && strcmp(value, "dirty") &&
		    strcmp(value, "all") && strcmp(value, "none")) {
			warning("Invalid parameter '%s' for config option "
					"'submodule.%s.ignore'", value, var);
			goto release_return;
		}

		free((void *) submodule->ignore);
		strbuf_addstr(&ignore, value);
		submodule->ignore = strbuf_detach(&ignore, NULL);
	} else if (!strcmp(item.buf, "url")) {
		struct strbuf url = STRBUF_INIT;
		if (!value) {
			ret = config_error_nonbool(var);
			goto release_return;
		}
		if (!me->overwrite && submodule->url != NULL) {
			warn_multiple_config(me->commit_sha1, submodule->name,
					"url");
			goto release_return;
		}

		free((void *) submodule->url);
		strbuf_addstr(&url, value);
		submodule->url = strbuf_detach(&url, NULL);
	}

release_return:
	strbuf_release(&name);
	strbuf_release(&item);

	return ret;
}

static int gitmodule_sha1_from_commit(const unsigned char *commit_sha1,
				      unsigned char *gitmodules_sha1)
{
	struct strbuf rev = STRBUF_INIT;
	int ret = 0;

	if (is_null_sha1(commit_sha1)) {
		hashcpy(gitmodules_sha1, null_sha1);
		return 1;
	}

	strbuf_addf(&rev, "%s:.gitmodules", sha1_to_hex(commit_sha1));
	if (get_sha1(rev.buf, gitmodules_sha1) >= 0)
		ret = 1;

	strbuf_release(&rev);
	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 unsigned char *commit_sha1, const char *key,
		enum lookup_type lookup_type)
{
	struct strbuf rev = STRBUF_INIT;
	unsigned long config_size;
	char *config;
	unsigned char sha1[20];
	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 (!commit_sha1 || !key) {
		struct hashmap_iter iter;
		struct submodule_entry *entry;

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

	if (!gitmodule_sha1_from_commit(commit_sha1, sha1))
		return NULL;

	switch (lookup_type) {
	case lookup_name:
		submodule = cache_lookup_name(cache, sha1, key);
		break;
	case lookup_path:
		submodule = cache_lookup_path(cache, sha1, key);
		break;
	}
	if (submodule)
		return submodule;

	config = read_sha1_file(sha1, &type, &config_size);
	if (!config)
		return NULL;

	if (type != OBJ_BLOB) {
		free(config);
		return NULL;
	}

	/* fill the submodule config into the cache */
	parameter.cache = cache;
	parameter.commit_sha1 = commit_sha1;
	parameter.gitmodules_sha1 = sha1;
	parameter.overwrite = 0;
	git_config_from_buf(parse_config, rev.buf, config, config_size,
			&parameter);
	free(config);

	switch (lookup_type) {
	case lookup_name:
		return cache_lookup_name(cache, sha1, key);
	case lookup_path:
		return cache_lookup_path(cache, sha1, key);
	default:
		return NULL;
	}
}

static const struct submodule *config_from_path(struct submodule_cache *cache,
		const unsigned char *commit_sha1, const char *path)
{
	return config_from(cache, commit_sha1, path, lookup_path);
}

static const struct submodule *config_from_name(struct submodule_cache *cache,
		const unsigned char *commit_sha1, const char *name)
{
	return config_from(cache, commit_sha1, name, lookup_name);
}

static void ensure_cache_init(void)
{
	if (is_cache_init)
		return;

	cache_init(&cache);
	is_cache_init = 1;
}

int parse_submodule_config_option(const char *var, const char *value)
{
	struct parse_config_parameter parameter;
	parameter.cache = &cache;
	parameter.commit_sha1 = NULL;
	parameter.gitmodules_sha1 = null_sha1;
	parameter.overwrite = 1;

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

const struct submodule *submodule_from_name(const unsigned char *commit_sha1,
		const char *name)
{
	ensure_cache_init();
	return config_from_name(&cache, commit_sha1, name);
}

const struct submodule *submodule_from_path(const unsigned char *commit_sha1,
		const char *path)
{
	ensure_cache_init();
	return config_from_path(&cache, commit_sha1, path);
}

void submodule_free(void)
{
	cache_free(&cache);
	is_cache_init = 0;
}
Commit	Line	Data
959b5455 HV	1	#include "cache.h"
	2	#include "submodule-config.h"
	3	#include "submodule.h"
	4	#include "strbuf.h"
	5
	6	/*
	7	* submodule cache lookup structure
	8	* There is one shared set of 'struct submodule' entries which can be
	9	* looked up by their sha1 blob id of the .gitmodule file and either
	10	* using path or name as key.
	11	* for_path stores submodule entries with path as key
	12	* for_name stores submodule entries with name as key
	13	*/
	14	struct submodule_cache {
	15	struct hashmap for_path;
	16	struct hashmap for_name;
	17	};
	18
	19	/*
	20	* thin wrapper struct needed to insert 'struct submodule' entries to
	21	* the hashmap
	22	*/
	23	struct submodule_entry {
	24	struct hashmap_entry ent;
	25	struct submodule *config;
	26	};
	27
	28	enum lookup_type {
	29	lookup_name,
	30	lookup_path
	31	};
	32
	33	static struct submodule_cache cache;
	34	static int is_cache_init;
	35
	36	static int config_path_cmp(const struct submodule_entry *a,
	37	const struct submodule_entry *b,
	38	const void *unused)
	39	{
	40	return strcmp(a->config->path, b->config->path) \|\|
	41	hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
	42	}
	43
	44	static int config_name_cmp(const struct submodule_entry *a,
	45	const struct submodule_entry *b,
	46	const void *unused)
	47	{
	48	return strcmp(a->config->name, b->config->name) \|\|
	49	hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
	50	}
	51
	52	static void cache_init(struct submodule_cache *cache)
	53	{
	54	hashmap_init(&cache->for_path, (hashmap_cmp_fn) config_path_cmp, 0);
	55	hashmap_init(&cache->for_name, (hashmap_cmp_fn) config_name_cmp, 0);
	56	}
	57
	58	static void free_one_config(struct submodule_entry *entry)
	59	{
	60	free((void *) entry->config->path);
	61	free((void *) entry->config->name);
	62	free(entry->config);
	63	}
	64
65	static void cache_free(struct submodule_cache *cache)
66	{
67	struct hashmap_iter iter;
68	struct submodule_entry *entry;
69
70	/*
71	* We iterate over the name hash here to be symmetric with the
72	* allocation of struct submodule entries. Each is allocated by
73	* their .gitmodule blob sha1 and submodule name.
74	*/
75	hashmap_iter_init(&cache->for_name, &iter);
76	while ((entry = hashmap_iter_next(&iter)))
77	free_one_config(entry);
78
79	hashmap_free(&cache->for_path, 1);
80	hashmap_free(&cache->for_name, 1);
81	}
82
83	static unsigned int hash_sha1_string(const unsigned char *sha1,
84	const char *string)
85	{
86	return memhash(sha1, 20) + strhash(string);
87	}
88
89	static void cache_put_path(struct submodule_cache *cache,
90	struct submodule *submodule)
91	{
92	unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
93	submodule->path);
94	struct submodule_entry e = xmalloc(sizeof(e));
95	hashmap_entry_init(e, hash);
96	e->config = submodule;
97	hashmap_put(&cache->for_path, e);
98	}
99
100	static void cache_remove_path(struct submodule_cache *cache,
101	struct submodule *submodule)
102	{
103	unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
104	submodule->path);
105	struct submodule_entry e;
106	struct submodule_entry *removed;
107	hashmap_entry_init(&e, hash);
108	e.config = submodule;
109	removed = hashmap_remove(&cache->for_path, &e, NULL);
110	free(removed);
111	}
112
113	static void cache_add(struct submodule_cache *cache,
114	struct submodule *submodule)
115	{
116	unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
117	submodule->name);
118	struct submodule_entry e = xmalloc(sizeof(e));
119	hashmap_entry_init(e, hash);
120	e->config = submodule;
121	hashmap_add(&cache->for_name, e);
122	}
123
124	static const struct submodule cache_lookup_path(struct submodule_cache cache,
125	const unsigned char gitmodules_sha1, const char path)
126	{
127	struct submodule_entry *entry;
128	unsigned int hash = hash_sha1_string(gitmodules_sha1, path);
129	struct submodule_entry key;
130	struct submodule key_config;
131
132	hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
133	key_config.path = path;
134
135	hashmap_entry_init(&key, hash);
136	key.config = &key_config;
137
138	entry = hashmap_get(&cache->for_path, &key, NULL);
139	if (entry)
140	return entry->config;
141	return NULL;
142	}
143
144	static struct submodule cache_lookup_name(struct submodule_cache cache,
145	const unsigned char gitmodules_sha1, const char name)
146	{
147	struct submodule_entry *entry;
148	unsigned int hash = hash_sha1_string(gitmodules_sha1, name);
149	struct submodule_entry key;
150	struct submodule key_config;
151
152	hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
153	key_config.name = name;
154
155	hashmap_entry_init(&key, hash);
156	key.config = &key_config;
157
158	entry = hashmap_get(&cache->for_name, &key, NULL);
159	if (entry)
160	return entry->config;
161	return NULL;
162	}
163
164	static int name_and_item_from_var(const char var, struct strbuf name,
165	struct strbuf *item)
166	{
167	const char subsection, key;
168	int subsection_len, parse;
169	parse = parse_config_key(var, "submodule", &subsection,
170	&subsection_len, &key);
171	if (parse < 0 \|\| !subsection)
172	return 0;
173
174	strbuf_add(name, subsection, subsection_len);
175	strbuf_addstr(item, key);
176
177	return 1;
178	}
179
180	static struct submodule lookup_or_create_by_name(struct submodule_cache cache,
181	const unsigned char gitmodules_sha1, const char name)
182	{
183	struct submodule *submodule;
184	struct strbuf name_buf = STRBUF_INIT;
185
186	submodule = cache_lookup_name(cache, gitmodules_sha1, name);
187	if (submodule)
188	return submodule;
189
190	submodule = xmalloc(sizeof(*submodule));
191
192	strbuf_addstr(&name_buf, name);
193	submodule->name = strbuf_detach(&name_buf, NULL);
194
195	submodule->path = NULL;
196	submodule->url = NULL;
197	submodule->fetch_recurse = RECURSE_SUBMODULES_NONE;
198	submodule->ignore = NULL;
199
200	hashcpy(submodule->gitmodules_sha1, gitmodules_sha1);
201
202	cache_add(cache, submodule);
203
204	return submodule;
205	}
206
207	static void warn_multiple_config(const unsigned char *commit_sha1,
208	const char name, const char option)
209	{
210	const char *commit_string = "WORKTREE";
211	if (commit_sha1)
212	commit_string = sha1_to_hex(commit_sha1);
213	warning("%s:.gitmodules, multiple configurations found for "
214	"'submodule.%s.%s'. Skipping second one!",
215	commit_string, name, option);
216	}
217
218	struct parse_config_parameter {
219	struct submodule_cache *cache;
220	const unsigned char *commit_sha1;
221	const unsigned char *gitmodules_sha1;
222	int overwrite;
223	};
224
225	static int parse_config(const char var, const char value, void *data)
226	{
227	struct parse_config_parameter *me = data;
228	struct submodule *submodule;
229	struct strbuf name = STRBUF_INIT, item = STRBUF_INIT;
230	int ret = 0;
231
232	/* this also ensures that we only parse submodule entries */
233	if (!name_and_item_from_var(var, &name, &item))
234	return 0;
235
236	submodule = lookup_or_create_by_name(me->cache, me->gitmodules_sha1,
237	name.buf);
238
239	if (!strcmp(item.buf, "path")) {
240	struct strbuf path = STRBUF_INIT;
241	if (!value) {
242	ret = config_error_nonbool(var);
243	goto release_return;
244	}
245	if (!me->overwrite && submodule->path != NULL) {
246	warn_multiple_config(me->commit_sha1, submodule->name,
247	"path");
248	goto release_return;
249	}
250
251	if (submodule->path)
252	cache_remove_path(me->cache, submodule);
253	free((void *) submodule->path);
254	strbuf_addstr(&path, value);
255	submodule->path = strbuf_detach(&path, NULL);
256	cache_put_path(me->cache, submodule);
257	} else if (!strcmp(item.buf, "fetchrecursesubmodules")) {
258	if (!me->overwrite &&
259	submodule->fetch_recurse != RECURSE_SUBMODULES_NONE) {
260	warn_multiple_config(me->commit_sha1, submodule->name,
261	"fetchrecursesubmodules");
262	goto release_return;
263	}
264
265	submodule->fetch_recurse = parse_fetch_recurse_submodules_arg(var, value);
266	} else if (!strcmp(item.buf, "ignore")) {
267	struct strbuf ignore = STRBUF_INIT;
268	if (!me->overwrite && submodule->ignore != NULL) {
269	warn_multiple_config(me->commit_sha1, submodule->name,
270	"ignore");
271	goto release_return;
272	}
273	if (!value) {
274	ret = config_error_nonbool(var);
275	goto release_return;
276	}
277	if (strcmp(value, "untracked") && strcmp(value, "dirty") &&
278	strcmp(value, "all") && strcmp(value, "none")) {
279	warning("Invalid parameter '%s' for config option "
280	"'submodule.%s.ignore'", value, var);
281	goto release_return;
282	}
283
284	free((void *) submodule->ignore);
285	strbuf_addstr(&ignore, value);
286	submodule->ignore = strbuf_detach(&ignore, NULL);
287	} else if (!strcmp(item.buf, "url")) {
288	struct strbuf url = STRBUF_INIT;
289	if (!value) {
290	ret = config_error_nonbool(var);
291	goto release_return;
292	}
293	if (!me->overwrite && submodule->url != NULL) {
294	warn_multiple_config(me->commit_sha1, submodule->name,
295	"url");
296	goto release_return;
297	}
298
299	free((void *) submodule->url);
300	strbuf_addstr(&url, value);
301	submodule->url = strbuf_detach(&url, NULL);
302	}
303
304	release_return:
305	strbuf_release(&name);
306	strbuf_release(&item);
307
308	return ret;
309	}
310
311	static int gitmodule_sha1_from_commit(const unsigned char *commit_sha1,
312	unsigned char *gitmodules_sha1)
313	{
314	struct strbuf rev = STRBUF_INIT;
315	int ret = 0;
316
317	if (is_null_sha1(commit_sha1)) {
318	hashcpy(gitmodules_sha1, null_sha1);
319	return 1;
320	}
321
322	strbuf_addf(&rev, "%s:.gitmodules", sha1_to_hex(commit_sha1));
323	if (get_sha1(rev.buf, gitmodules_sha1) >= 0)
324	ret = 1;
325
326	strbuf_release(&rev);
327	return ret;
328	}
329
330	/* This does a lookup of a submodule configuration by name or by path
331	* (key) with on-demand reading of the appropriate .gitmodules from
332	* revisions.
333	*/
334	static const struct submodule config_from(struct submodule_cache cache,
335	const unsigned char commit_sha1, const char key,
336	enum lookup_type lookup_type)
337	{
338	struct strbuf rev = STRBUF_INIT;
339	unsigned long config_size;
340	char *config;
341	unsigned char sha1[20];
342	enum object_type type;
343	const struct submodule *submodule = NULL;
344	struct parse_config_parameter parameter;
345
346	/*
347	* If any parameter except the cache is a NULL pointer just
348	* return the first submodule. Can be used to check whether
349	* there are any submodules parsed.
350	*/
351	if (!commit_sha1 \|\| !key) {
352	struct hashmap_iter iter;
353	struct submodule_entry *entry;
354
355	hashmap_iter_init(&cache->for_name, &iter);
356	entry = hashmap_iter_next(&iter);
357	if (!entry)
358	return NULL;
359	return entry->config;
360	}
361
362	if (!gitmodule_sha1_from_commit(commit_sha1, sha1))
363	return NULL;
364
365	switch (lookup_type) {
366	case lookup_name:
367	submodule = cache_lookup_name(cache, sha1, key);
368	break;
369	case lookup_path:
370	submodule = cache_lookup_path(cache, sha1, key);
371	break;
372	}
373	if (submodule)
374	return submodule;
375
376	config = read_sha1_file(sha1, &type, &config_size);
377	if (!config)
378	return NULL;
379
380	if (type != OBJ_BLOB) {
381	free(config);
382	return NULL;
383	}
384
385	/* fill the submodule config into the cache */
386	parameter.cache = cache;
387	parameter.commit_sha1 = commit_sha1;
388	parameter.gitmodules_sha1 = sha1;
389	parameter.overwrite = 0;
390	git_config_from_buf(parse_config, rev.buf, config, config_size,
391	&parameter);
392	free(config);
393
394	switch (lookup_type) {
395	case lookup_name:
396	return cache_lookup_name(cache, sha1, key);
397	case lookup_path:
398	return cache_lookup_path(cache, sha1, key);
399	default:
400	return NULL;
401	}
402	}
403
404	static const struct submodule config_from_path(struct submodule_cache cache,
405	const unsigned char commit_sha1, const char path)
406	{
407	return config_from(cache, commit_sha1, path, lookup_path);
408	}
409
410	static const struct submodule config_from_name(struct submodule_cache cache,
411	const unsigned char commit_sha1, const char name)
412	{
413	return config_from(cache, commit_sha1, name, lookup_name);
414	}
415
416	static void ensure_cache_init(void)
417	{
418	if (is_cache_init)
419	return;
420
421	cache_init(&cache);
422	is_cache_init = 1;
423	}
424
851e18c3 HV	425	int parse_submodule_config_option(const char var, const char value)
	426	{
	427	struct parse_config_parameter parameter;
	428	parameter.cache = &cache;
	429	parameter.commit_sha1 = NULL;
	430	parameter.gitmodules_sha1 = null_sha1;
	431	parameter.overwrite = 1;
	432
	433	ensure_cache_init();
	434	return parse_config(var, value, &parameter);
	435	}
	436
959b5455 HV	437	const struct submodule submodule_from_name(const unsigned char commit_sha1,
	438	const char *name)
	439	{
	440	ensure_cache_init();
	441	return config_from_name(&cache, commit_sha1, name);
	442	}
	443
	444	const struct submodule submodule_from_path(const unsigned char commit_sha1,
	445	const char *path)
	446	{
	447	ensure_cache_init();
	448	return config_from_path(&cache, commit_sha1, path);
	449	}
	450
	451	void submodule_free(void)
	452	{
	453	cache_free(&cache);
	454	is_cache_init = 0;
	455	}