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![Jeff King](/assets/img/avatar_default.png)
The previous commit taught the submodule code to invoke our "git clone $url $path" with a "--" separator so that we aren't confused by urls or paths that start with dashes. However, that's just one code path. It's not clear if there are others, and it would be an easy mistake to add one in the future. Moreover, even with the fix in the previous commit, it's quite hard to actually do anything useful with such an entry. Any url starting with a dash must fall into one of three categories: - it's meant as a file url, like "-path". But then any clone is not going to have the matching path, since it's by definition relative inside the newly created clone. If you spell it as "./-path", the submodule code sees the "/" and translates this to an absolute path, so it at least works (assuming the receiver has the same filesystem layout as you). But that trick does not apply for a bare "-path". - it's meant as an ssh url, like "-host:path". But this already doesn't work, as we explicitly disallow ssh hostnames that begin with a dash (to avoid option injection against ssh). - it's a remote-helper scheme, like "-scheme::data". This _could_ work if the receiver bends over backwards and creates a funny-named helper like "git-remote--scheme". But normally there would not be any helper that matches. Since such a url does not work today and is not likely to do anything useful in the future, let's simply disallow them entirely. That protects the existing "git clone" path (in a belt-and-suspenders way), along with any others that might exist. Our tests cover two cases: 1. A file url with "./" continues to work, showing that there's an escape hatch for people with truly silly repo names. 2. A url starting with "-" is rejected. Note that we expect case (2) to fail, but it would have done so even without this commit, for the reasons given above. So instead of just expecting failure, let's also check for the magic word "ignoring" on stderr. That lets us know that we failed for the right reason. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
634 lines
16 KiB
C
634 lines
16 KiB
C
#include "cache.h"
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#include "repository.h"
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#include "config.h"
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#include "submodule-config.h"
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#include "submodule.h"
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#include "strbuf.h"
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#include "parse-options.h"
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/*
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* submodule cache lookup structure
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* There is one shared set of 'struct submodule' entries which can be
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* looked up by their sha1 blob id of the .gitmodule file and either
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* using path or name as key.
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* for_path stores submodule entries with path as key
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* for_name stores submodule entries with name as key
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*/
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struct submodule_cache {
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struct hashmap for_path;
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struct hashmap for_name;
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unsigned initialized:1;
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};
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/*
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* thin wrapper struct needed to insert 'struct submodule' entries to
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* the hashmap
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*/
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struct submodule_entry {
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struct hashmap_entry ent;
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struct submodule *config;
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};
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enum lookup_type {
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lookup_name,
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lookup_path
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};
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static int config_path_cmp(const void *unused_cmp_data,
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const struct submodule_entry *a,
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const struct submodule_entry *b,
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const void *unused_keydata)
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{
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return strcmp(a->config->path, b->config->path) ||
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hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
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}
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static int config_name_cmp(const void *unused_cmp_data,
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const struct submodule_entry *a,
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const struct submodule_entry *b,
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const void *unused_keydata)
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{
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return strcmp(a->config->name, b->config->name) ||
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hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
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}
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static struct submodule_cache *submodule_cache_alloc(void)
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{
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return xcalloc(1, sizeof(struct submodule_cache));
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}
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static void submodule_cache_init(struct submodule_cache *cache)
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{
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hashmap_init(&cache->for_path, (hashmap_cmp_fn) config_path_cmp, NULL, 0);
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hashmap_init(&cache->for_name, (hashmap_cmp_fn) config_name_cmp, NULL, 0);
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cache->initialized = 1;
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}
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static void free_one_config(struct submodule_entry *entry)
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{
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free((void *) entry->config->path);
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free((void *) entry->config->name);
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free((void *) entry->config->branch);
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free((void *) entry->config->update_strategy.command);
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free(entry->config);
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}
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static void submodule_cache_clear(struct submodule_cache *cache)
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{
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struct hashmap_iter iter;
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struct submodule_entry *entry;
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if (!cache->initialized)
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return;
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/*
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* We iterate over the name hash here to be symmetric with the
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* allocation of struct submodule entries. Each is allocated by
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* their .gitmodule blob sha1 and submodule name.
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*/
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hashmap_iter_init(&cache->for_name, &iter);
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while ((entry = hashmap_iter_next(&iter)))
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free_one_config(entry);
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hashmap_free(&cache->for_path, 1);
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hashmap_free(&cache->for_name, 1);
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cache->initialized = 0;
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}
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void submodule_cache_free(struct submodule_cache *cache)
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{
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submodule_cache_clear(cache);
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free(cache);
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}
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static unsigned int hash_sha1_string(const unsigned char *sha1,
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const char *string)
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{
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return memhash(sha1, 20) + strhash(string);
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}
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static void cache_put_path(struct submodule_cache *cache,
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struct submodule *submodule)
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{
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unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
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submodule->path);
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struct submodule_entry *e = xmalloc(sizeof(*e));
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hashmap_entry_init(e, hash);
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e->config = submodule;
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hashmap_put(&cache->for_path, e);
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}
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static void cache_remove_path(struct submodule_cache *cache,
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struct submodule *submodule)
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{
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unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
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submodule->path);
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struct submodule_entry e;
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struct submodule_entry *removed;
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hashmap_entry_init(&e, hash);
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e.config = submodule;
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removed = hashmap_remove(&cache->for_path, &e, NULL);
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free(removed);
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}
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static void cache_add(struct submodule_cache *cache,
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struct submodule *submodule)
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{
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unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
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submodule->name);
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struct submodule_entry *e = xmalloc(sizeof(*e));
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hashmap_entry_init(e, hash);
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e->config = submodule;
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hashmap_add(&cache->for_name, e);
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}
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static const struct submodule *cache_lookup_path(struct submodule_cache *cache,
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const unsigned char *gitmodules_sha1, const char *path)
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{
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struct submodule_entry *entry;
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unsigned int hash = hash_sha1_string(gitmodules_sha1, path);
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struct submodule_entry key;
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struct submodule key_config;
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hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
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key_config.path = path;
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hashmap_entry_init(&key, hash);
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key.config = &key_config;
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entry = hashmap_get(&cache->for_path, &key, NULL);
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if (entry)
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return entry->config;
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return NULL;
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}
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static struct submodule *cache_lookup_name(struct submodule_cache *cache,
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const unsigned char *gitmodules_sha1, const char *name)
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{
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struct submodule_entry *entry;
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unsigned int hash = hash_sha1_string(gitmodules_sha1, name);
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struct submodule_entry key;
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struct submodule key_config;
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hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
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key_config.name = name;
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hashmap_entry_init(&key, hash);
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key.config = &key_config;
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entry = hashmap_get(&cache->for_name, &key, NULL);
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if (entry)
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return entry->config;
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return NULL;
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}
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int check_submodule_name(const char *name)
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{
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/* Disallow empty names */
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if (!*name)
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return -1;
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/*
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* Look for '..' as a path component. Check both '/' and '\\' as
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* separators rather than is_dir_sep(), because we want the name rules
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* to be consistent across platforms.
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*/
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goto in_component; /* always start inside component */
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while (*name) {
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char c = *name++;
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if (c == '/' || c == '\\') {
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in_component:
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if (name[0] == '.' && name[1] == '.' &&
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(!name[2] || name[2] == '/' || name[2] == '\\'))
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return -1;
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}
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}
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return 0;
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}
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static int name_and_item_from_var(const char *var, struct strbuf *name,
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struct strbuf *item)
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{
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const char *subsection, *key;
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int subsection_len, parse;
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parse = parse_config_key(var, "submodule", &subsection,
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&subsection_len, &key);
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if (parse < 0 || !subsection)
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return 0;
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strbuf_add(name, subsection, subsection_len);
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if (check_submodule_name(name->buf) < 0) {
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warning(_("ignoring suspicious submodule name: %s"), name->buf);
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strbuf_release(name);
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return 0;
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}
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strbuf_addstr(item, key);
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return 1;
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}
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static struct submodule *lookup_or_create_by_name(struct submodule_cache *cache,
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const unsigned char *gitmodules_sha1, const char *name)
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{
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struct submodule *submodule;
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struct strbuf name_buf = STRBUF_INIT;
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submodule = cache_lookup_name(cache, gitmodules_sha1, name);
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if (submodule)
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return submodule;
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submodule = xmalloc(sizeof(*submodule));
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strbuf_addstr(&name_buf, name);
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submodule->name = strbuf_detach(&name_buf, NULL);
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submodule->path = NULL;
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submodule->url = NULL;
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submodule->update_strategy.type = SM_UPDATE_UNSPECIFIED;
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submodule->update_strategy.command = NULL;
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submodule->fetch_recurse = RECURSE_SUBMODULES_NONE;
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submodule->ignore = NULL;
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submodule->branch = NULL;
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submodule->recommend_shallow = -1;
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hashcpy(submodule->gitmodules_sha1, gitmodules_sha1);
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cache_add(cache, submodule);
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return submodule;
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}
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static int parse_fetch_recurse(const char *opt, const char *arg,
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int die_on_error)
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{
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switch (git_config_maybe_bool(opt, arg)) {
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case 1:
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return RECURSE_SUBMODULES_ON;
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case 0:
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return RECURSE_SUBMODULES_OFF;
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default:
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if (!strcmp(arg, "on-demand"))
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return RECURSE_SUBMODULES_ON_DEMAND;
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if (die_on_error)
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die("bad %s argument: %s", opt, arg);
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else
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return RECURSE_SUBMODULES_ERROR;
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}
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}
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int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
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{
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return parse_fetch_recurse(opt, arg, 1);
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}
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int option_fetch_parse_recurse_submodules(const struct option *opt,
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const char *arg, int unset)
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{
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int *v;
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if (!opt->value)
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return -1;
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v = opt->value;
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if (unset) {
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*v = RECURSE_SUBMODULES_OFF;
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} else {
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if (arg)
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*v = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
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else
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*v = RECURSE_SUBMODULES_ON;
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}
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return 0;
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}
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static int parse_update_recurse(const char *opt, const char *arg,
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int die_on_error)
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{
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switch (git_config_maybe_bool(opt, arg)) {
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case 1:
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return RECURSE_SUBMODULES_ON;
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case 0:
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return RECURSE_SUBMODULES_OFF;
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default:
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if (die_on_error)
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die("bad %s argument: %s", opt, arg);
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return RECURSE_SUBMODULES_ERROR;
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}
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}
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int parse_update_recurse_submodules_arg(const char *opt, const char *arg)
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{
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return parse_update_recurse(opt, arg, 1);
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}
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static int parse_push_recurse(const char *opt, const char *arg,
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int die_on_error)
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{
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switch (git_config_maybe_bool(opt, arg)) {
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case 1:
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/* There's no simple "on" value when pushing */
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if (die_on_error)
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die("bad %s argument: %s", opt, arg);
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else
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return RECURSE_SUBMODULES_ERROR;
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case 0:
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return RECURSE_SUBMODULES_OFF;
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default:
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if (!strcmp(arg, "on-demand"))
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return RECURSE_SUBMODULES_ON_DEMAND;
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else if (!strcmp(arg, "check"))
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return RECURSE_SUBMODULES_CHECK;
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else if (!strcmp(arg, "only"))
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return RECURSE_SUBMODULES_ONLY;
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else if (die_on_error)
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die("bad %s argument: %s", opt, arg);
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else
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return RECURSE_SUBMODULES_ERROR;
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}
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}
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int parse_push_recurse_submodules_arg(const char *opt, const char *arg)
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{
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return parse_push_recurse(opt, arg, 1);
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}
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static void warn_multiple_config(const unsigned char *treeish_name,
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const char *name, const char *option)
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{
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const char *commit_string = "WORKTREE";
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if (treeish_name)
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commit_string = sha1_to_hex(treeish_name);
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warning("%s:.gitmodules, multiple configurations found for "
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"'submodule.%s.%s'. Skipping second one!",
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commit_string, name, option);
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}
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static void warn_command_line_option(const char *var, const char *value)
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{
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warning(_("ignoring '%s' which may be interpreted as"
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" a command-line option: %s"), var, value);
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}
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struct parse_config_parameter {
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struct submodule_cache *cache;
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const unsigned char *treeish_name;
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const unsigned char *gitmodules_sha1;
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int overwrite;
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};
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static int parse_config(const char *var, const char *value, void *data)
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{
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struct parse_config_parameter *me = data;
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struct submodule *submodule;
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struct strbuf name = STRBUF_INIT, item = STRBUF_INIT;
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int ret = 0;
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/* this also ensures that we only parse submodule entries */
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if (!name_and_item_from_var(var, &name, &item))
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return 0;
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submodule = lookup_or_create_by_name(me->cache,
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me->gitmodules_sha1,
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name.buf);
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if (!strcmp(item.buf, "path")) {
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if (!value)
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ret = config_error_nonbool(var);
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else if (!me->overwrite && submodule->path)
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warn_multiple_config(me->treeish_name, submodule->name,
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"path");
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else {
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if (submodule->path)
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cache_remove_path(me->cache, submodule);
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free((void *) submodule->path);
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submodule->path = xstrdup(value);
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cache_put_path(me->cache, submodule);
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}
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} else if (!strcmp(item.buf, "fetchrecursesubmodules")) {
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/* when parsing worktree configurations we can die early */
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int die_on_error = is_null_sha1(me->gitmodules_sha1);
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if (!me->overwrite &&
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submodule->fetch_recurse != RECURSE_SUBMODULES_NONE)
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warn_multiple_config(me->treeish_name, submodule->name,
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"fetchrecursesubmodules");
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else
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submodule->fetch_recurse = parse_fetch_recurse(
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var, value,
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die_on_error);
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} else if (!strcmp(item.buf, "ignore")) {
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if (!value)
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ret = config_error_nonbool(var);
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else if (!me->overwrite && submodule->ignore)
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warn_multiple_config(me->treeish_name, submodule->name,
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"ignore");
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else if (strcmp(value, "untracked") &&
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strcmp(value, "dirty") &&
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strcmp(value, "all") &&
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strcmp(value, "none"))
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warning("Invalid parameter '%s' for config option "
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"'submodule.%s.ignore'", value, name.buf);
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else {
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free((void *) submodule->ignore);
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submodule->ignore = xstrdup(value);
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}
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} else if (!strcmp(item.buf, "url")) {
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if (!value) {
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ret = config_error_nonbool(var);
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} else if (looks_like_command_line_option(value)) {
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warn_command_line_option(var, value);
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} else if (!me->overwrite && submodule->url) {
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warn_multiple_config(me->treeish_name, submodule->name,
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"url");
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} else {
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free((void *) submodule->url);
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submodule->url = xstrdup(value);
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}
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} else if (!strcmp(item.buf, "update")) {
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if (!value)
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ret = config_error_nonbool(var);
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else if (!me->overwrite &&
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submodule->update_strategy.type != SM_UPDATE_UNSPECIFIED)
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warn_multiple_config(me->treeish_name, submodule->name,
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"update");
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else if (parse_submodule_update_strategy(value,
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&submodule->update_strategy) < 0)
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die(_("invalid value for %s"), var);
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} else if (!strcmp(item.buf, "shallow")) {
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if (!me->overwrite && submodule->recommend_shallow != -1)
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warn_multiple_config(me->treeish_name, submodule->name,
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"shallow");
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else
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submodule->recommend_shallow =
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git_config_bool(var, value);
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} else if (!strcmp(item.buf, "branch")) {
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if (!me->overwrite && submodule->branch)
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warn_multiple_config(me->treeish_name, submodule->name,
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"branch");
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else {
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free((void *)submodule->branch);
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submodule->branch = xstrdup(value);
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}
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}
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strbuf_release(&name);
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strbuf_release(&item);
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return ret;
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}
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int gitmodule_sha1_from_commit(const unsigned char *treeish_name,
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unsigned char *gitmodules_sha1,
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|
struct strbuf *rev)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (is_null_sha1(treeish_name)) {
|
|
hashclr(gitmodules_sha1);
|
|
return 1;
|
|
}
|
|
|
|
strbuf_addf(rev, "%s:.gitmodules", sha1_to_hex(treeish_name));
|
|
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 *treeish_name, 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 (!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_sha1_from_commit(treeish_name, 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.treeish_name = treeish_name;
|
|
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 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);
|
|
}
|
|
|
|
int submodule_config_option(struct repository *repo,
|
|
const char *var, const char *value)
|
|
{
|
|
struct parse_config_parameter parameter;
|
|
|
|
submodule_cache_check_init(repo);
|
|
|
|
parameter.cache = repo->submodule_cache;
|
|
parameter.treeish_name = NULL;
|
|
parameter.gitmodules_sha1 = null_sha1;
|
|
parameter.overwrite = 1;
|
|
|
|
return parse_config(var, value, ¶meter);
|
|
}
|
|
|
|
int parse_submodule_config_option(const char *var, const char *value)
|
|
{
|
|
return submodule_config_option(the_repository, var, value);
|
|
}
|
|
|
|
const struct submodule *submodule_from_name(const unsigned char *treeish_name,
|
|
const char *name)
|
|
{
|
|
submodule_cache_check_init(the_repository);
|
|
return config_from(the_repository->submodule_cache, treeish_name, name, lookup_name);
|
|
}
|
|
|
|
const struct submodule *submodule_from_path(const unsigned char *treeish_name,
|
|
const char *path)
|
|
{
|
|
submodule_cache_check_init(the_repository);
|
|
return config_from(the_repository->submodule_cache, treeish_name, path, lookup_path);
|
|
}
|
|
|
|
const struct submodule *submodule_from_cache(struct repository *repo,
|
|
const unsigned char *treeish_name,
|
|
const char *key)
|
|
{
|
|
submodule_cache_check_init(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);
|
|
}
|