[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 int parse_fetch_recurse(const char *opt, const char *arg,
			       int die_on_error)
{
	switch (git_config_maybe_bool(opt, 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_fetch_recurse_submodules_arg(const char *opt, const char *arg)
{
	return parse_fetch_recurse(opt, arg, 1);
}

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")) {
		if (!value)
			ret = config_error_nonbool(var);
		else if (!me->overwrite && submodule->path != NULL)
			warn_multiple_config(me->commit_sha1, 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->commit_sha1, 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 != NULL)
			warn_multiple_config(me->commit_sha1, 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, var);
		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 != NULL) {
			warn_multiple_config(me->commit_sha1, submodule->name,
					"url");
		} else {
			free((void *) submodule->url);
			submodule->url = xstrdup(value);
		}
	}

	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
027771fc HV	207	static int parse_fetch_recurse(const char opt, const char arg,
	208	int die_on_error)
	209	{
	210	switch (git_config_maybe_bool(opt, arg)) {
	211	case 1:
	212	return RECURSE_SUBMODULES_ON;
	213	case 0:
	214	return RECURSE_SUBMODULES_OFF;
	215	default:
	216	if (!strcmp(arg, "on-demand"))
	217	return RECURSE_SUBMODULES_ON_DEMAND;
	218
	219	if (die_on_error)
	220	die("bad %s argument: %s", opt, arg);
	221	else
	222	return RECURSE_SUBMODULES_ERROR;
	223	}
	224	}
	225
	226	int parse_fetch_recurse_submodules_arg(const char opt, const char arg)
	227	{
	228	return parse_fetch_recurse(opt, arg, 1);
	229	}
	230
959b5455 HV	231	static void warn_multiple_config(const unsigned char *commit_sha1,
	232	const char name, const char option)
	233	{
	234	const char *commit_string = "WORKTREE";
	235	if (commit_sha1)
	236	commit_string = sha1_to_hex(commit_sha1);
	237	warning("%s:.gitmodules, multiple configurations found for "
	238	"'submodule.%s.%s'. Skipping second one!",
	239	commit_string, name, option);
	240	}
	241
	242	struct parse_config_parameter {
	243	struct submodule_cache *cache;
	244	const unsigned char *commit_sha1;
	245	const unsigned char *gitmodules_sha1;
	246	int overwrite;
	247	};
	248
	249	static int parse_config(const char var, const char value, void *data)
	250	{
	251	struct parse_config_parameter *me = data;
	252	struct submodule *submodule;
	253	struct strbuf name = STRBUF_INIT, item = STRBUF_INIT;
	254	int ret = 0;
	255
	256	/* this also ensures that we only parse submodule entries */
	257	if (!name_and_item_from_var(var, &name, &item))
	258	return 0;
	259
147875fd SB	260	submodule = lookup_or_create_by_name(me->cache,
	261	me->gitmodules_sha1,
	262	name.buf);
959b5455 HV	263
959b5455 HV	264	if (!strcmp(item.buf, "path")) {
147875fd	265	if (!value)
959b5455	266	ret = config_error_nonbool(var);
147875fd	267	else if (!me->overwrite && submodule->path != NULL)
959b5455 HV	268	warn_multiple_config(me->commit_sha1, submodule->name,
959b5455 HV	269	"path");
147875fd SB	270	else {
	271	if (submodule->path)
	272	cache_remove_path(me->cache, submodule);
	273	free((void *) submodule->path);
	274	submodule->path = xstrdup(value);
	275	cache_put_path(me->cache, submodule);
959b5455	276	}
959b5455	277	} else if (!strcmp(item.buf, "fetchrecursesubmodules")) {
027771fc HV	278	/* when parsing worktree configurations we can die early */
027771fc HV	279	int die_on_error = is_null_sha1(me->gitmodules_sha1);
959b5455	280	if (!me->overwrite &&
147875fd	281	submodule->fetch_recurse != RECURSE_SUBMODULES_NONE)
959b5455 HV	282	warn_multiple_config(me->commit_sha1, submodule->name,
959b5455 HV	283	"fetchrecursesubmodules");
147875fd SB	284	else
	285	submodule->fetch_recurse = parse_fetch_recurse(
	286	var, value,
027771fc	287	die_on_error);
959b5455	288	} else if (!strcmp(item.buf, "ignore")) {
147875fd SB	289	if (!value)
	290	ret = config_error_nonbool(var);
	291	else if (!me->overwrite && submodule->ignore != NULL)
959b5455 HV	292	warn_multiple_config(me->commit_sha1, submodule->name,
959b5455 HV	293	"ignore");
147875fd SB	294	else if (strcmp(value, "untracked") &&
	295	strcmp(value, "dirty") &&
	296	strcmp(value, "all") &&
	297	strcmp(value, "none"))
959b5455 HV	298	warning("Invalid parameter '%s' for config option "
959b5455 HV	299	"'submodule.%s.ignore'", value, var);
147875fd SB	300	else {
	301	free((void *) submodule->ignore);
	302	submodule->ignore = xstrdup(value);
959b5455	303	}
959b5455	304	} else if (!strcmp(item.buf, "url")) {
959b5455 HV	305	if (!value) {
959b5455 HV	306	ret = config_error_nonbool(var);
147875fd	307	} else if (!me->overwrite && submodule->url != NULL) {
959b5455 HV	308	warn_multiple_config(me->commit_sha1, submodule->name,
959b5455 HV	309	"url");
147875fd SB	310	} else {
	311	free((void *) submodule->url);
	312	submodule->url = xstrdup(value);
959b5455	313	}
959b5455 HV	314	}
959b5455 HV	315
959b5455 HV	316	strbuf_release(&name);
	317	strbuf_release(&item);
	318
	319	return ret;
	320	}
	321
	322	static int gitmodule_sha1_from_commit(const unsigned char *commit_sha1,
	323	unsigned char *gitmodules_sha1)
	324	{
	325	struct strbuf rev = STRBUF_INIT;
	326	int ret = 0;
	327
	328	if (is_null_sha1(commit_sha1)) {
	329	hashcpy(gitmodules_sha1, null_sha1);
	330	return 1;
	331	}
	332
	333	strbuf_addf(&rev, "%s:.gitmodules", sha1_to_hex(commit_sha1));
	334	if (get_sha1(rev.buf, gitmodules_sha1) >= 0)
	335	ret = 1;
	336
	337	strbuf_release(&rev);
	338	return ret;
	339	}
	340
	341	/* This does a lookup of a submodule configuration by name or by path
	342	* (key) with on-demand reading of the appropriate .gitmodules from
	343	* revisions.
	344	*/
	345	static const struct submodule config_from(struct submodule_cache cache,
	346	const unsigned char commit_sha1, const char key,
	347	enum lookup_type lookup_type)
	348	{
	349	struct strbuf rev = STRBUF_INIT;
	350	unsigned long config_size;
	351	char *config;
	352	unsigned char sha1[20];
	353	enum object_type type;
	354	const struct submodule *submodule = NULL;
	355	struct parse_config_parameter parameter;
	356
	357	/*
	358	* If any parameter except the cache is a NULL pointer just
	359	* return the first submodule. Can be used to check whether
	360	* there are any submodules parsed.
	361	*/
	362	if (!commit_sha1 \|\| !key) {
	363	struct hashmap_iter iter;
	364	struct submodule_entry *entry;
	365
	366	hashmap_iter_init(&cache->for_name, &iter);
	367	entry = hashmap_iter_next(&iter);
	368	if (!entry)
	369	return NULL;
	370	return entry->config;
	371	}
	372
	373	if (!gitmodule_sha1_from_commit(commit_sha1, sha1))
	374	return NULL;
	375
	376	switch (lookup_type) {
	377	case lookup_name:
	378	submodule = cache_lookup_name(cache, sha1, key);
	379	break;
380	case lookup_path:
381	submodule = cache_lookup_path(cache, sha1, key);
382	break;
383	}
384	if (submodule)
385	return submodule;
386
387	config = read_sha1_file(sha1, &type, &config_size);
388	if (!config)
389	return NULL;
390
391	if (type != OBJ_BLOB) {
392	free(config);
393	return NULL;
394	}
395
396	/* fill the submodule config into the cache */
397	parameter.cache = cache;
398	parameter.commit_sha1 = commit_sha1;
399	parameter.gitmodules_sha1 = sha1;
400	parameter.overwrite = 0;
401	git_config_from_buf(parse_config, rev.buf, config, config_size,
402	&parameter);
403	free(config);
404
405	switch (lookup_type) {
406	case lookup_name:
407	return cache_lookup_name(cache, sha1, key);
408	case lookup_path:
409	return cache_lookup_path(cache, sha1, key);
410	default:
411	return NULL;
412	}
413	}
414
415	static const struct submodule config_from_path(struct submodule_cache cache,
416	const unsigned char commit_sha1, const char path)
417	{
418	return config_from(cache, commit_sha1, path, lookup_path);
419	}
420
421	static const struct submodule config_from_name(struct submodule_cache cache,
422	const unsigned char commit_sha1, const char name)
423	{
424	return config_from(cache, commit_sha1, name, lookup_name);
425	}
426
427	static void ensure_cache_init(void)
428	{
429	if (is_cache_init)
430	return;
431
432	cache_init(&cache);
433	is_cache_init = 1;
434	}
435
851e18c3 HV	436	int parse_submodule_config_option(const char var, const char value)
	437	{
	438	struct parse_config_parameter parameter;
	439	parameter.cache = &cache;
	440	parameter.commit_sha1 = NULL;
	441	parameter.gitmodules_sha1 = null_sha1;
	442	parameter.overwrite = 1;
	443
	444	ensure_cache_init();
	445	return parse_config(var, value, &parameter);
	446	}
	447
959b5455 HV	448	const struct submodule submodule_from_name(const unsigned char commit_sha1,
	449	const char *name)
	450	{
	451	ensure_cache_init();
	452	return config_from_name(&cache, commit_sha1, name);
	453	}
	454
	455	const struct submodule submodule_from_path(const unsigned char commit_sha1,
	456	const char *path)
	457	{
	458	ensure_cache_init();
	459	return config_from_path(&cache, commit_sha1, path);
	460	}
	461
	462	void submodule_free(void)
	463	{
	464	cache_free(&cache);
	465	is_cache_init = 0;
	466	}