diff options
Diffstat (limited to 'third_party/git/submodule-config.c')
| -rw-r--r-- | third_party/git/submodule-config.c | 810 |
1 files changed, 810 insertions, 0 deletions
diff --git a/third_party/git/submodule-config.c b/third_party/git/submodule-config.c new file mode 100644 index 000000000000..4d1c92d5826d --- /dev/null +++ b/third_party/git/submodule-config.c @@ -0,0 +1,810 @@ +#include "cache.h" +#include "dir.h" +#include "repository.h" +#include "config.h" +#include "submodule-config.h" +#include "submodule.h" +#include "strbuf.h" +#include "object-store.h" +#include "parse-options.h" + +/* + * submodule cache lookup structure + * There is one shared set of 'struct submodule' entries which can be + * looked up by their sha1 blob id of the .gitmodules file and either + * using path or name as key. + * for_path stores submodule entries with path as key + * for_name stores submodule entries with name as key + */ +struct submodule_cache { + struct hashmap for_path; + struct hashmap for_name; + unsigned initialized:1; + unsigned gitmodules_read:1; +}; + +/* + * thin wrapper struct needed to insert 'struct submodule' entries to + * the hashmap + */ +struct submodule_entry { + struct hashmap_entry ent; + struct submodule *config; +}; + +enum lookup_type { + lookup_name, + lookup_path +}; + +static int config_path_cmp(const void *unused_cmp_data, + const struct hashmap_entry *eptr, + const struct hashmap_entry *entry_or_key, + const void *unused_keydata) +{ + const struct submodule_entry *a, *b; + + a = container_of(eptr, const struct submodule_entry, ent); + b = container_of(entry_or_key, const struct submodule_entry, ent); + + return strcmp(a->config->path, b->config->path) || + !oideq(&a->config->gitmodules_oid, &b->config->gitmodules_oid); +} + +static int config_name_cmp(const void *unused_cmp_data, + const struct hashmap_entry *eptr, + const struct hashmap_entry *entry_or_key, + const void *unused_keydata) +{ + const struct submodule_entry *a, *b; + + a = container_of(eptr, const struct submodule_entry, ent); + b = container_of(entry_or_key, const struct submodule_entry, ent); + + return strcmp(a->config->name, b->config->name) || + !oideq(&a->config->gitmodules_oid, &b->config->gitmodules_oid); +} + +static struct submodule_cache *submodule_cache_alloc(void) +{ + return xcalloc(1, sizeof(struct submodule_cache)); +} + +static void submodule_cache_init(struct submodule_cache *cache) +{ + hashmap_init(&cache->for_path, config_path_cmp, NULL, 0); + hashmap_init(&cache->for_name, config_name_cmp, NULL, 0); + cache->initialized = 1; +} + +static void free_one_config(struct submodule_entry *entry) +{ + free((void *) entry->config->path); + free((void *) entry->config->name); + free((void *) entry->config->branch); + free((void *) entry->config->update_strategy.command); + free(entry->config); +} + +static void submodule_cache_clear(struct submodule_cache *cache) +{ + struct hashmap_iter iter; + struct submodule_entry *entry; + + if (!cache->initialized) + return; + + /* + * We iterate over the name hash here to be symmetric with the + * allocation of struct submodule entries. Each is allocated by + * their .gitmodules blob sha1 and submodule name. + */ + hashmap_for_each_entry(&cache->for_name, &iter, entry, + ent /* member name */) + free_one_config(entry); + + hashmap_free_entries(&cache->for_path, struct submodule_entry, ent); + hashmap_free_entries(&cache->for_name, struct submodule_entry, ent); + cache->initialized = 0; + cache->gitmodules_read = 0; +} + +void submodule_cache_free(struct submodule_cache *cache) +{ + submodule_cache_clear(cache); + free(cache); +} + +static unsigned int hash_oid_string(const struct object_id *oid, + const char *string) +{ + return memhash(oid->hash, the_hash_algo->rawsz) + strhash(string); +} + +static void cache_put_path(struct submodule_cache *cache, + struct submodule *submodule) +{ + unsigned int hash = hash_oid_string(&submodule->gitmodules_oid, + submodule->path); + struct submodule_entry *e = xmalloc(sizeof(*e)); + hashmap_entry_init(&e->ent, hash); + e->config = submodule; + hashmap_put(&cache->for_path, &e->ent); +} + +static void cache_remove_path(struct submodule_cache *cache, + struct submodule *submodule) +{ + unsigned int hash = hash_oid_string(&submodule->gitmodules_oid, + submodule->path); + struct submodule_entry e; + struct submodule_entry *removed; + hashmap_entry_init(&e.ent, hash); + e.config = submodule; + removed = hashmap_remove_entry(&cache->for_path, &e, ent, NULL); + free(removed); +} + +static void cache_add(struct submodule_cache *cache, + struct submodule *submodule) +{ + unsigned int hash = hash_oid_string(&submodule->gitmodules_oid, + submodule->name); + struct submodule_entry *e = xmalloc(sizeof(*e)); + hashmap_entry_init(&e->ent, hash); + e->config = submodule; + hashmap_add(&cache->for_name, &e->ent); +} + +static const struct submodule *cache_lookup_path(struct submodule_cache *cache, + const struct object_id *gitmodules_oid, const char *path) +{ + struct submodule_entry *entry; + unsigned int hash = hash_oid_string(gitmodules_oid, path); + struct submodule_entry key; + struct submodule key_config; + + oidcpy(&key_config.gitmodules_oid, gitmodules_oid); + key_config.path = path; + + hashmap_entry_init(&key.ent, hash); + key.config = &key_config; + + entry = hashmap_get_entry(&cache->for_path, &key, ent, NULL); + if (entry) + return entry->config; + return NULL; +} + +static struct submodule *cache_lookup_name(struct submodule_cache *cache, + const struct object_id *gitmodules_oid, const char *name) +{ + struct submodule_entry *entry; + unsigned int hash = hash_oid_string(gitmodules_oid, name); + struct submodule_entry key; + struct submodule key_config; + + oidcpy(&key_config.gitmodules_oid, gitmodules_oid); + key_config.name = name; + + hashmap_entry_init(&key.ent, hash); + key.config = &key_config; + + entry = hashmap_get_entry(&cache->for_name, &key, ent, NULL); + if (entry) + return entry->config; + return NULL; +} + +int check_submodule_name(const char *name) +{ + /* Disallow empty names */ + if (!*name) + return -1; + + /* + * Look for '..' as a path component. Check both '/' and '\\' as + * separators rather than is_dir_sep(), because we want the name rules + * to be consistent across platforms. + */ + goto in_component; /* always start inside component */ + while (*name) { + char c = *name++; + if (c == '/' || c == '\\') { +in_component: + if (name[0] == '.' && name[1] == '.' && + (!name[2] || name[2] == '/' || name[2] == '\\')) + return -1; + } + } + + return 0; +} + +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); + if (check_submodule_name(name->buf) < 0) { + warning(_("ignoring suspicious submodule name: %s"), name->buf); + strbuf_release(name); + return 0; + } + + strbuf_addstr(item, key); + + return 1; +} + +static struct submodule *lookup_or_create_by_name(struct submodule_cache *cache, + const struct object_id *gitmodules_oid, const char *name) +{ + struct submodule *submodule; + struct strbuf name_buf = STRBUF_INIT; + + submodule = cache_lookup_name(cache, gitmodules_oid, 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; + + oidcpy(&submodule->gitmodules_oid, gitmodules_oid); + + cache_add(cache, submodule); + + return submodule; +} + +static int parse_fetch_recurse(const char *opt, const char *arg, + int die_on_error) +{ + switch (git_parse_maybe_bool(arg)) { + case 1: + return RECURSE_SUBMODULES_ON; + case 0: + return RECURSE_SUBMODULES_OFF; + default: + if (!strcmp(arg, "on-demand")) + return RECURSE_SUBMODULES_ON_DEMAND; + /* + * Please update $__git_fetch_recurse_submodules in + * git-completion.bash when you add new options. + */ + if (die_on_error) + die("bad %s argument: %s", opt, arg); + else + return RECURSE_SUBMODULES_ERROR; + } +} + +int parse_submodule_fetchjobs(const char *var, const char *value) +{ + int fetchjobs = git_config_int(var, value); + if (fetchjobs < 0) + die(_("negative values not allowed for submodule.fetchjobs")); + return fetchjobs; +} + +int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg) +{ + return parse_fetch_recurse(opt, arg, 1); +} + +int option_fetch_parse_recurse_submodules(const struct option *opt, + const char *arg, int unset) +{ + int *v; + + if (!opt->value) + return -1; + + v = opt->value; + + if (unset) { + *v = RECURSE_SUBMODULES_OFF; + } else { + if (arg) + *v = parse_fetch_recurse_submodules_arg(opt->long_name, arg); + else + *v = RECURSE_SUBMODULES_ON; + } + return 0; +} + +static int parse_update_recurse(const char *opt, const char *arg, + int die_on_error) +{ + switch (git_parse_maybe_bool(arg)) { + case 1: + return RECURSE_SUBMODULES_ON; + case 0: + return RECURSE_SUBMODULES_OFF; + default: + if (die_on_error) + die("bad %s argument: %s", opt, arg); + return RECURSE_SUBMODULES_ERROR; + } +} + +int parse_update_recurse_submodules_arg(const char *opt, const char *arg) +{ + return parse_update_recurse(opt, arg, 1); +} + +static int parse_push_recurse(const char *opt, const char *arg, + int die_on_error) +{ + switch (git_parse_maybe_bool(arg)) { + case 1: + /* There's no simple "on" value when pushing */ + if (die_on_error) + die("bad %s argument: %s", opt, arg); + else + return RECURSE_SUBMODULES_ERROR; + case 0: + return RECURSE_SUBMODULES_OFF; + default: + if (!strcmp(arg, "on-demand")) + return RECURSE_SUBMODULES_ON_DEMAND; + else if (!strcmp(arg, "check")) + return RECURSE_SUBMODULES_CHECK; + else if (!strcmp(arg, "only")) + return RECURSE_SUBMODULES_ONLY; + /* + * Please update $__git_push_recurse_submodules in + * git-completion.bash when you add new modes. + */ + 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 struct object_id *treeish_name, + const char *name, const char *option) +{ + const char *commit_string = "WORKTREE"; + if (treeish_name) + commit_string = oid_to_hex(treeish_name); + warning("%s:.gitmodules, multiple configurations found for " + "'submodule.%s.%s'. Skipping second one!", + commit_string, name, option); +} + +static void warn_command_line_option(const char *var, const char *value) +{ + warning(_("ignoring '%s' which may be interpreted as" + " a command-line option: %s"), var, value); +} + +struct parse_config_parameter { + struct submodule_cache *cache; + const struct object_id *treeish_name; + const struct object_id *gitmodules_oid; + int overwrite; +}; + +/* + * Parse a config item from .gitmodules. + * + * This does not handle submodule-related configuration from the main + * config store (.git/config, etc). Callers are responsible for + * checking for overrides in the main config store when appropriate. + */ +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_oid, + name.buf); + + if (!strcmp(item.buf, "path")) { + if (!value) + ret = config_error_nonbool(var); + else if (looks_like_command_line_option(value)) + warn_command_line_option(var, value); + else if (!me->overwrite && submodule->path) + warn_multiple_config(me->treeish_name, submodule->name, + "path"); + else { + if (submodule->path) + cache_remove_path(me->cache, submodule); + free((void *) submodule->path); + submodule->path = xstrdup(value); + cache_put_path(me->cache, submodule); + } + } else if (!strcmp(item.buf, "fetchrecursesubmodules")) { + /* when parsing worktree configurations we can die early */ + int die_on_error = is_null_oid(me->gitmodules_oid); + if (!me->overwrite && + submodule->fetch_recurse != RECURSE_SUBMODULES_NONE) + warn_multiple_config(me->treeish_name, submodule->name, + "fetchrecursesubmodules"); + else + submodule->fetch_recurse = parse_fetch_recurse( + var, value, + die_on_error); + } else if (!strcmp(item.buf, "ignore")) { + if (!value) + ret = config_error_nonbool(var); + else if (!me->overwrite && submodule->ignore) + warn_multiple_config(me->treeish_name, submodule->name, + "ignore"); + else if (strcmp(value, "untracked") && + strcmp(value, "dirty") && + strcmp(value, "all") && + strcmp(value, "none")) + warning("Invalid parameter '%s' for config option " + "'submodule.%s.ignore'", value, name.buf); + else { + free((void *) submodule->ignore); + submodule->ignore = xstrdup(value); + } + } else if (!strcmp(item.buf, "url")) { + if (!value) { + ret = config_error_nonbool(var); + } else if (looks_like_command_line_option(value)) { + warn_command_line_option(var, value); + } else if (!me->overwrite && submodule->url) { + warn_multiple_config(me->treeish_name, submodule->name, + "url"); + } else { + free((void *) submodule->url); + submodule->url = xstrdup(value); + } + } else if (!strcmp(item.buf, "update")) { + if (!value) + ret = config_error_nonbool(var); + else if (!me->overwrite && + submodule->update_strategy.type != SM_UPDATE_UNSPECIFIED) + warn_multiple_config(me->treeish_name, submodule->name, + "update"); + else if (parse_submodule_update_strategy(value, + &submodule->update_strategy) < 0 || + submodule->update_strategy.type == SM_UPDATE_COMMAND) + die(_("invalid value for %s"), var); + } else if (!strcmp(item.buf, "shallow")) { + if (!me->overwrite && submodule->recommend_shallow != -1) + warn_multiple_config(me->treeish_name, submodule->name, + "shallow"); + else + submodule->recommend_shallow = + git_config_bool(var, value); + } else if (!strcmp(item.buf, "branch")) { + if (!me->overwrite && submodule->branch) + warn_multiple_config(me->treeish_name, submodule->name, + "branch"); + else { + free((void *)submodule->branch); + submodule->branch = xstrdup(value); + } + } + + strbuf_release(&name); + strbuf_release(&item); + + return ret; +} + +static int gitmodule_oid_from_commit(const struct object_id *treeish_name, + struct object_id *gitmodules_oid, + struct strbuf *rev) +{ + int ret = 0; + + if (is_null_oid(treeish_name)) { + oidclr(gitmodules_oid); + return 1; + } + + strbuf_addf(rev, "%s:.gitmodules", oid_to_hex(treeish_name)); + if (get_oid(rev->buf, gitmodules_oid) >= 0) + ret = 1; + + return ret; +} + +/* This does a lookup of a submodule configuration by name or by path + * (key) with on-demand reading of the appropriate .gitmodules from + * revisions. + */ +static const struct submodule *config_from(struct submodule_cache *cache, + const struct object_id *treeish_name, const char *key, + enum lookup_type lookup_type) +{ + struct strbuf rev = STRBUF_INIT; + unsigned long config_size; + char *config = NULL; + struct object_id oid; + enum object_type type; + const struct submodule *submodule = NULL; + struct parse_config_parameter parameter; + + /* + * If any parameter except the cache is a NULL pointer just + * return the first submodule. Can be used to check whether + * there are any submodules parsed. + */ + if (!treeish_name || !key) { + struct hashmap_iter iter; + struct submodule_entry *entry; + + entry = hashmap_iter_first_entry(&cache->for_name, &iter, + struct submodule_entry, + ent /* member name */); + if (!entry) + return NULL; + return entry->config; + } + + if (!gitmodule_oid_from_commit(treeish_name, &oid, &rev)) + goto out; + + switch (lookup_type) { + case lookup_name: + submodule = cache_lookup_name(cache, &oid, key); + break; + case lookup_path: + submodule = cache_lookup_path(cache, &oid, key); + break; + } + if (submodule) + goto out; + + config = read_object_file(&oid, &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_oid = &oid; + parameter.overwrite = 0; + git_config_from_mem(parse_config, CONFIG_ORIGIN_SUBMODULE_BLOB, rev.buf, + config, config_size, ¶meter, NULL); + strbuf_release(&rev); + free(config); + + switch (lookup_type) { + case lookup_name: + return cache_lookup_name(cache, &oid, key); + case lookup_path: + return cache_lookup_path(cache, &oid, 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); +} + +/* + * Note: This function is private for a reason, the '.gitmodules' file should + * not be used as a mechanism to retrieve arbitrary configuration stored in + * the repository. + * + * Runs the provided config function on the '.gitmodules' file found in the + * working directory. + */ +static void config_from_gitmodules(config_fn_t fn, struct repository *repo, void *data) +{ + if (repo->worktree) { + struct git_config_source config_source = { + 0, .scope = CONFIG_SCOPE_SUBMODULE + }; + const struct config_options opts = { 0 }; + struct object_id oid; + char *file; + char *oidstr = NULL; + + file = repo_worktree_path(repo, GITMODULES_FILE); + if (file_exists(file)) { + config_source.file = file; + } else if (repo_get_oid(repo, GITMODULES_INDEX, &oid) >= 0 || + repo_get_oid(repo, GITMODULES_HEAD, &oid) >= 0) { + config_source.blob = oidstr = xstrdup(oid_to_hex(&oid)); + if (repo != the_repository) + add_to_alternates_memory(repo->objects->odb->path); + } else { + goto out; + } + + config_with_options(fn, data, &config_source, &opts); + +out: + free(oidstr); + free(file); + } +} + +static int gitmodules_cb(const char *var, const char *value, void *data) +{ + struct repository *repo = data; + struct parse_config_parameter parameter; + + parameter.cache = repo->submodule_cache; + parameter.treeish_name = NULL; + parameter.gitmodules_oid = &null_oid; + parameter.overwrite = 1; + + return parse_config(var, value, ¶meter); +} + +void repo_read_gitmodules(struct repository *repo, int skip_if_read) +{ + submodule_cache_check_init(repo); + + if (repo->submodule_cache->gitmodules_read && skip_if_read) + return; + + if (repo_read_index(repo) < 0) + return; + + if (!is_gitmodules_unmerged(repo->index)) + config_from_gitmodules(gitmodules_cb, repo, repo); + + repo->submodule_cache->gitmodules_read = 1; +} + +void gitmodules_config_oid(const struct object_id *commit_oid) +{ + struct strbuf rev = STRBUF_INIT; + struct object_id oid; + + submodule_cache_check_init(the_repository); + + if (gitmodule_oid_from_commit(commit_oid, &oid, &rev)) { + git_config_from_blob_oid(gitmodules_cb, rev.buf, + &oid, the_repository); + } + strbuf_release(&rev); + + the_repository->submodule_cache->gitmodules_read = 1; +} + +const struct submodule *submodule_from_name(struct repository *r, + const struct object_id *treeish_name, + const char *name) +{ + repo_read_gitmodules(r, 1); + return config_from(r->submodule_cache, treeish_name, name, lookup_name); +} + +const struct submodule *submodule_from_path(struct repository *r, + const struct object_id *treeish_name, + const char *path) +{ + repo_read_gitmodules(r, 1); + return config_from(r->submodule_cache, treeish_name, path, lookup_path); +} + +void submodule_free(struct repository *r) +{ + if (r->submodule_cache) + submodule_cache_clear(r->submodule_cache); +} + +static int config_print_callback(const char *var, const char *value, void *cb_data) +{ + char *wanted_key = cb_data; + + if (!strcmp(wanted_key, var)) + printf("%s\n", value); + + return 0; +} + +int print_config_from_gitmodules(struct repository *repo, const char *key) +{ + int ret; + char *store_key; + + ret = git_config_parse_key(key, &store_key, NULL); + if (ret < 0) + return CONFIG_INVALID_KEY; + + config_from_gitmodules(config_print_callback, repo, store_key); + + free(store_key); + return 0; +} + +int config_set_in_gitmodules_file_gently(const char *key, const char *value) +{ + int ret; + + ret = git_config_set_in_file_gently(GITMODULES_FILE, key, value); + if (ret < 0) + /* Maybe the user already did that, don't error out here */ + warning(_("Could not update .gitmodules entry %s"), key); + + return ret; +} + +struct fetch_config { + int *max_children; + int *recurse_submodules; +}; + +static int gitmodules_fetch_config(const char *var, const char *value, void *cb) +{ + struct fetch_config *config = cb; + if (!strcmp(var, "submodule.fetchjobs")) { + *(config->max_children) = parse_submodule_fetchjobs(var, value); + return 0; + } else if (!strcmp(var, "fetch.recursesubmodules")) { + *(config->recurse_submodules) = parse_fetch_recurse_submodules_arg(var, value); + return 0; + } + + return 0; +} + +void fetch_config_from_gitmodules(int *max_children, int *recurse_submodules) +{ + struct fetch_config config = { + .max_children = max_children, + .recurse_submodules = recurse_submodules + }; + config_from_gitmodules(gitmodules_fetch_config, the_repository, &config); +} + +static int gitmodules_update_clone_config(const char *var, const char *value, + void *cb) +{ + int *max_jobs = cb; + if (!strcmp(var, "submodule.fetchjobs")) + *max_jobs = parse_submodule_fetchjobs(var, value); + return 0; +} + +void update_clone_config_from_gitmodules(int *max_jobs) +{ + config_from_gitmodules(gitmodules_update_clone_config, the_repository, &max_jobs); +} |