https://github.com/git/git
Tip revision: 27dea4683b608c5c0487dee74cbda13b62803b73 authored by Junio C Hamano on 22 September 2017, 05:42:22 UTC
Git 2.10.5
Git 2.10.5
Tip revision: 27dea46
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 the_submodule_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((void *) entry->config->branch);
free((void *) entry->config->update_strategy.command);
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->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_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 int parse_push_recurse(const char *opt, const char *arg,
int die_on_error)
{
switch (git_config_maybe_bool(opt, 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 (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 *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)
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)
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) {
warn_multiple_config(me->commit_sha1, 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->commit_sha1, 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->commit_sha1, 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->commit_sha1, submodule->name,
"branch");
else {
free((void *)submodule->branch);
submodule->branch = 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)
{
int ret = 0;
if (is_null_sha1(commit_sha1)) {
hashclr(gitmodules_sha1);
return 1;
}
strbuf_addf(rev, "%s:.gitmodules", sha1_to_hex(commit_sha1));
if (get_sha1(rev->buf, gitmodules_sha1) >= 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 unsigned char *commit_sha1, const char *key,
enum lookup_type lookup_type)
{
struct strbuf rev = STRBUF_INIT;
unsigned long config_size;
char *config = NULL;
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;
entry = hashmap_iter_first(&cache->for_name, &iter);
if (!entry)
return NULL;
return entry->config;
}
if (!gitmodule_sha1_from_commit(commit_sha1, sha1, &rev))
goto out;
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)
goto out;
config = read_sha1_file(sha1, &type, &config_size);
if (!config || type != OBJ_BLOB)
goto out;
/* 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_mem(parse_config, CONFIG_ORIGIN_SUBMODULE_BLOB, rev.buf,
config, config_size, ¶meter);
strbuf_release(&rev);
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;
}
out:
strbuf_release(&rev);
free(config);
return submodule;
}
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(&the_submodule_cache);
is_cache_init = 1;
}
int parse_submodule_config_option(const char *var, const char *value)
{
struct parse_config_parameter parameter;
parameter.cache = &the_submodule_cache;
parameter.commit_sha1 = NULL;
parameter.gitmodules_sha1 = null_sha1;
parameter.overwrite = 1;
ensure_cache_init();
return parse_config(var, value, ¶meter);
}
const struct submodule *submodule_from_name(const unsigned char *commit_sha1,
const char *name)
{
ensure_cache_init();
return config_from_name(&the_submodule_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(&the_submodule_cache, commit_sha1, path);
}
void submodule_free(void)
{
cache_free(&the_submodule_cache);
is_cache_init = 0;
}