submodule-config.c

   1 #include "git-compat-util.h"
   2 #include "dir.h"
   3 #include "environment.h"
   4 #include "gettext.h"
   5 #include "hex.h"
   6 #include "path.h"
   7 #include "repository.h"
   8 #include "config.h"
   9 #include "submodule-config.h"
  10 #include "submodule.h"
  11 #include "strbuf.h"
  12 #include "object-name.h"
  13 #include "object-store-ll.h"
  14 #include "parse-options.h"
  15 #include "thread-utils.h"
  16 #include "tree-walk.h"
  17
  18 /*
  19  * submodule cache lookup structure
  20  * There is one shared set of 'struct submodule' entries which can be
  21  * looked up by their sha1 blob id of the .gitmodules file and either
  22  * using path or name as key.
  23  * for_path stores submodule entries with path as key
  24  * for_name stores submodule entries with name as key
  25  */
  26 struct submodule_cache {
  27         struct hashmap for_path;
  28         struct hashmap for_name;
  29         unsigned initialized:1;
  30         unsigned gitmodules_read:1;
  31 };
  32
  33 /*
  34  * thin wrapper struct needed to insert 'struct submodule' entries to
  35  * the hashmap
  36  */
  37 struct submodule_entry {
  38         struct hashmap_entry ent;
  39         struct submodule *config;
  40 };
  41
  42 enum lookup_type {
  43         lookup_name,
  44         lookup_path
  45 };
  46
  47 static int config_path_cmp(const void *cmp_data UNUSED,
  48                            const struct hashmap_entry *eptr,
  49                            const struct hashmap_entry *entry_or_key,
  50                            const void *keydata UNUSED)
  51 {
  52         const struct submodule_entry *a, *b;
  53
  54         a = container_of(eptr, const struct submodule_entry, ent);
  55         b = container_of(entry_or_key, const struct submodule_entry, ent);
  56
  57         return strcmp(a->config->path, b->config->path) ||
  58                !oideq(&a->config->gitmodules_oid, &b->config->gitmodules_oid);
  59 }
  60
  61 static int config_name_cmp(const void *cmp_data UNUSED,
  62                            const struct hashmap_entry *eptr,
  63                            const struct hashmap_entry *entry_or_key,
  64                            const void *keydata UNUSED)
  65 {
  66         const struct submodule_entry *a, *b;
  67
  68         a = container_of(eptr, const struct submodule_entry, ent);
  69         b = container_of(entry_or_key, const struct submodule_entry, ent);
  70
  71         return strcmp(a->config->name, b->config->name) ||
  72                !oideq(&a->config->gitmodules_oid, &b->config->gitmodules_oid);
  73 }
  74
  75 static struct submodule_cache *submodule_cache_alloc(void)
  76 {
  77         return xcalloc(1, sizeof(struct submodule_cache));
  78 }
  79
  80 static void submodule_cache_init(struct submodule_cache *cache)
  81 {
  82         hashmap_init(&cache->for_path, config_path_cmp, NULL, 0);
  83         hashmap_init(&cache->for_name, config_name_cmp, NULL, 0);
  84         cache->initialized = 1;
  85 }
  86
  87 static void free_one_config(struct submodule_entry *entry)
  88 {
  89         free((void *) entry->config->path);
  90         free((void *) entry->config->name);
  91         free((void *) entry->config->branch);
  92         free((void *) entry->config->update_strategy.command);
  93         free(entry->config);
  94 }
  95
  96 static void submodule_cache_clear(struct submodule_cache *cache)
  97 {
  98         struct hashmap_iter iter;
  99         struct submodule_entry *entry;
 100
 101         if (!cache->initialized)
 102                 return;
 103
 104         /*
 105          * We iterate over the name hash here to be symmetric with the
 106          * allocation of struct submodule entries. Each is allocated by
 107          * their .gitmodules blob sha1 and submodule name.
 108          */
 109         hashmap_for_each_entry(&cache->for_name, &iter, entry,
 110                                 ent /* member name */)
 111                 free_one_config(entry);
 112
 113         hashmap_clear_and_free(&cache->for_path, struct submodule_entry, ent);
 114         hashmap_clear_and_free(&cache->for_name, struct submodule_entry, ent);
 115         cache->initialized = 0;
 116         cache->gitmodules_read = 0;
 117 }
 118
 119 void submodule_cache_free(struct submodule_cache *cache)
 120 {
 121         submodule_cache_clear(cache);
 122         free(cache);
 123 }
 124
 125 static unsigned int hash_oid_string(const struct object_id *oid,
 126                                     const char *string)
 127 {
 128         return memhash(oid->hash, the_hash_algo->rawsz) + strhash(string);
 129 }
 130
 131 static void cache_put_path(struct submodule_cache *cache,
 132                            struct submodule *submodule)
 133 {
 134         unsigned int hash = hash_oid_string(&submodule->gitmodules_oid,
 135                                             submodule->path);
 136         struct submodule_entry *e = xmalloc(sizeof(*e));
 137         hashmap_entry_init(&e->ent, hash);
 138         e->config = submodule;
 139         hashmap_put(&cache->for_path, &e->ent);
 140 }
 141
 142 static void cache_remove_path(struct submodule_cache *cache,
 143                               struct submodule *submodule)
 144 {
 145         unsigned int hash = hash_oid_string(&submodule->gitmodules_oid,
 146                                             submodule->path);
 147         struct submodule_entry e;
 148         struct submodule_entry *removed;
 149         hashmap_entry_init(&e.ent, hash);
 150         e.config = submodule;
 151         removed = hashmap_remove_entry(&cache->for_path, &e, ent, NULL);
 152         free(removed);
 153 }
 154
 155 static void cache_add(struct submodule_cache *cache,
 156                       struct submodule *submodule)
 157 {
 158         unsigned int hash = hash_oid_string(&submodule->gitmodules_oid,
 159                                             submodule->name);
 160         struct submodule_entry *e = xmalloc(sizeof(*e));
 161         hashmap_entry_init(&e->ent, hash);
 162         e->config = submodule;
 163         hashmap_add(&cache->for_name, &e->ent);
 164 }
 165
 166 static const struct submodule *cache_lookup_path(struct submodule_cache *cache,
 167                 const struct object_id *gitmodules_oid, const char *path)
 168 {
 169         struct submodule_entry *entry;
 170         unsigned int hash = hash_oid_string(gitmodules_oid, path);
 171         struct submodule_entry key;
 172         struct submodule key_config;
 173
 174         oidcpy(&key_config.gitmodules_oid, gitmodules_oid);
 175         key_config.path = path;
 176
 177         hashmap_entry_init(&key.ent, hash);
 178         key.config = &key_config;
 179
 180         entry = hashmap_get_entry(&cache->for_path, &key, ent, NULL);
 181         if (entry)
 182                 return entry->config;
 183         return NULL;
 184 }
 185
 186 static struct submodule *cache_lookup_name(struct submodule_cache *cache,
 187                 const struct object_id *gitmodules_oid, const char *name)
 188 {
 189         struct submodule_entry *entry;
 190         unsigned int hash = hash_oid_string(gitmodules_oid, name);
 191         struct submodule_entry key;
 192         struct submodule key_config;
 193
 194         oidcpy(&key_config.gitmodules_oid, gitmodules_oid);
 195         key_config.name = name;
 196
 197         hashmap_entry_init(&key.ent, hash);
 198         key.config = &key_config;
 199
 200         entry = hashmap_get_entry(&cache->for_name, &key, ent, NULL);
 201         if (entry)
 202                 return entry->config;
 203         return NULL;
 204 }
 205
 206 int check_submodule_name(const char *name)
 207 {
 208         /* Disallow empty names */
 209         if (!*name)
 210                 return -1;
 211
 212         /*
 213          * Look for '..' as a path component. Check is_xplatform_dir_sep() as
 214          * separators rather than is_dir_sep(), because we want the name rules
 215          * to be consistent across platforms.
 216          */
 217         goto in_component; /* always start inside component */
 218         while (*name) {
 219                 char c = *name++;
 220                 if (is_xplatform_dir_sep(c)) {
 221 in_component:
 222                         if (name[0] == '.' && name[1] == '.' &&
 223                             (!name[2] || is_xplatform_dir_sep(name[2])))
 224                                 return -1;
 225                 }
 226         }
 227
 228         return 0;
 229 }
 230
 231 static int name_and_item_from_var(const char *var, struct strbuf *name,
 232                                   struct strbuf *item)
 233 {
 234         const char *subsection, *key;
 235         size_t subsection_len;
 236         int parse;
 237         parse = parse_config_key(var, "submodule", &subsection,
 238                         &subsection_len, &key);
 239         if (parse < 0 || !subsection)
 240                 return 0;
 241
 242         strbuf_add(name, subsection, subsection_len);
 243         if (check_submodule_name(name->buf) < 0) {
 244                 warning(_("ignoring suspicious submodule name: %s"), name->buf);
 245                 strbuf_release(name);
 246                 return 0;
 247         }
 248
 249         strbuf_addstr(item, key);
 250
 251         return 1;
 252 }
 253
 254 static struct submodule *lookup_or_create_by_name(struct submodule_cache *cache,
 255                 const struct object_id *gitmodules_oid, const char *name)
 256 {
 257         struct submodule *submodule;
 258         struct strbuf name_buf = STRBUF_INIT;
 259
 260         submodule = cache_lookup_name(cache, gitmodules_oid, name);
 261         if (submodule)
 262                 return submodule;
 263
 264         submodule = xmalloc(sizeof(*submodule));
 265
 266         strbuf_addstr(&name_buf, name);
 267         submodule->name = strbuf_detach(&name_buf, NULL);
 268
 269         submodule->path = NULL;
 270         submodule->url = NULL;
 271         submodule->update_strategy.type = SM_UPDATE_UNSPECIFIED;
 272         submodule->update_strategy.command = NULL;
 273         submodule->fetch_recurse = RECURSE_SUBMODULES_NONE;
 274         submodule->ignore = NULL;
 275         submodule->branch = NULL;
 276         submodule->recommend_shallow = -1;
 277
 278         oidcpy(&submodule->gitmodules_oid, gitmodules_oid);
 279
 280         cache_add(cache, submodule);
 281
 282         return submodule;
 283 }
 284
 285 static int parse_fetch_recurse(const char *opt, const char *arg,
 286                                int die_on_error)
 287 {
 288         switch (git_parse_maybe_bool(arg)) {
 289         case 1:
 290                 return RECURSE_SUBMODULES_ON;
 291         case 0:
 292                 return RECURSE_SUBMODULES_OFF;
 293         default:
 294                 if (!strcmp(arg, "on-demand"))
 295                         return RECURSE_SUBMODULES_ON_DEMAND;
 296                 /*
 297                  * Please update $__git_fetch_recurse_submodules in
 298                  * git-completion.bash when you add new options.
 299                  */
 300                 if (die_on_error)
 301                         die("bad %s argument: %s", opt, arg);
 302                 else
 303                         return RECURSE_SUBMODULES_ERROR;
 304         }
 305 }
 306
 307 int parse_submodule_fetchjobs(const char *var, const char *value,
 308                               const struct key_value_info *kvi)
 309 {
 310         int fetchjobs = git_config_int(var, value, kvi);
 311         if (fetchjobs < 0)
 312                 die(_("negative values not allowed for submodule.fetchJobs"));
 313         if (!fetchjobs)
 314                 fetchjobs = online_cpus();
 315         return fetchjobs;
 316 }
 317
 318 int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
 319 {
 320         return parse_fetch_recurse(opt, arg, 1);
 321 }
 322
 323 int option_fetch_parse_recurse_submodules(const struct option *opt,
 324                                           const char *arg, int unset)
 325 {
 326         int *v;
 327
 328         if (!opt->value)
 329                 return -1;
 330
 331         v = opt->value;
 332
 333         if (unset) {
 334                 *v = RECURSE_SUBMODULES_OFF;
 335         } else {
 336                 if (arg)
 337                         *v = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
 338                 else
 339                         *v = RECURSE_SUBMODULES_ON;
 340         }
 341         return 0;
 342 }
 343
 344 static int parse_update_recurse(const char *opt, const char *arg,
 345                                 int die_on_error)
 346 {
 347         switch (git_parse_maybe_bool(arg)) {
 348         case 1:
 349                 return RECURSE_SUBMODULES_ON;
 350         case 0:
 351                 return RECURSE_SUBMODULES_OFF;
 352         default:
 353                 if (die_on_error)
 354                         die("bad %s argument: %s", opt, arg);
 355                 return RECURSE_SUBMODULES_ERROR;
 356         }
 357 }
 358
 359 int parse_update_recurse_submodules_arg(const char *opt, const char *arg)
 360 {
 361         return parse_update_recurse(opt, arg, 1);
 362 }
 363
 364 static int parse_push_recurse(const char *opt, const char *arg,
 365                                int die_on_error)
 366 {
 367         switch (git_parse_maybe_bool(arg)) {
 368         case 1:
 369                 /* There's no simple "on" value when pushing */
 370                 if (die_on_error)
 371                         die("bad %s argument: %s", opt, arg);
 372                 else
 373                         return RECURSE_SUBMODULES_ERROR;
 374         case 0:
 375                 return RECURSE_SUBMODULES_OFF;
 376         default:
 377                 if (!strcmp(arg, "on-demand"))
 378                         return RECURSE_SUBMODULES_ON_DEMAND;
 379                 else if (!strcmp(arg, "check"))
 380                         return RECURSE_SUBMODULES_CHECK;
 381                 else if (!strcmp(arg, "only"))
 382                         return RECURSE_SUBMODULES_ONLY;
 383                 /*
 384                  * Please update $__git_push_recurse_submodules in
 385                  * git-completion.bash when you add new modes.
 386                  */
 387                 else if (die_on_error)
 388                         die("bad %s argument: %s", opt, arg);
 389                 else
 390                         return RECURSE_SUBMODULES_ERROR;
 391         }
 392 }
 393
 394 int parse_push_recurse_submodules_arg(const char *opt, const char *arg)
 395 {
 396         return parse_push_recurse(opt, arg, 1);
 397 }
 398
 399 static void warn_multiple_config(const struct object_id *treeish_name,
 400                                  const char *name, const char *option)
 401 {
 402         const char *commit_string = "WORKTREE";
 403         if (treeish_name)
 404                 commit_string = oid_to_hex(treeish_name);
 405         warning("%s:.gitmodules, multiple configurations found for "
 406                         "'submodule.%s.%s'. Skipping second one!",
 407                         commit_string, name, option);
 408 }
 409
 410 static void warn_command_line_option(const char *var, const char *value)
 411 {
 412         warning(_("ignoring '%s' which may be interpreted as"
 413                   " a command-line option: %s"), var, value);
 414 }
 415
 416 struct parse_config_parameter {
 417         struct submodule_cache *cache;
 418         const struct object_id *treeish_name;
 419         const struct object_id *gitmodules_oid;
 420         int overwrite;
 421 };
 422
 423 /*
 424  * Parse a config item from .gitmodules.
 425  *
 426  * This does not handle submodule-related configuration from the main
 427  * config store (.git/config, etc).  Callers are responsible for
 428  * checking for overrides in the main config store when appropriate.
 429  */
 430 static int parse_config(const char *var, const char *value,
 431                         const struct config_context *ctx UNUSED, void *data)
 432 {
 433         struct parse_config_parameter *me = data;
 434         struct submodule *submodule;
 435         struct strbuf name = STRBUF_INIT, item = STRBUF_INIT;
 436         int ret = 0;
 437
 438         /* this also ensures that we only parse submodule entries */
 439         if (!name_and_item_from_var(var, &name, &item))
 440                 return 0;
 441
 442         submodule = lookup_or_create_by_name(me->cache,
 443                                              me->gitmodules_oid,
 444                                              name.buf);
 445
 446         if (!strcmp(item.buf, "path")) {
 447                 if (!value)
 448                         ret = config_error_nonbool(var);
 449                 else if (looks_like_command_line_option(value))
 450                         warn_command_line_option(var, value);
 451                 else if (!me->overwrite && submodule->path)
 452                         warn_multiple_config(me->treeish_name, submodule->name,
 453                                         "path");
 454                 else {
 455                         if (submodule->path)
 456                                 cache_remove_path(me->cache, submodule);
 457                         free((void *) submodule->path);
 458                         submodule->path = xstrdup(value);
 459                         cache_put_path(me->cache, submodule);
 460                 }
 461         } else if (!strcmp(item.buf, "fetchrecursesubmodules")) {
 462                 /* when parsing worktree configurations we can die early */
 463                 int die_on_error = is_null_oid(me->gitmodules_oid);
 464                 if (!me->overwrite &&
 465                     submodule->fetch_recurse != RECURSE_SUBMODULES_NONE)
 466                         warn_multiple_config(me->treeish_name, submodule->name,
 467                                         "fetchrecursesubmodules");
 468                 else
 469                         submodule->fetch_recurse = parse_fetch_recurse(
 470                                                                 var, value,
 471                                                                 die_on_error);
 472         } else if (!strcmp(item.buf, "ignore")) {
 473                 if (!value)
 474                         ret = config_error_nonbool(var);
 475                 else if (!me->overwrite && submodule->ignore)
 476                         warn_multiple_config(me->treeish_name, submodule->name,
 477                                         "ignore");
 478                 else if (strcmp(value, "untracked") &&
 479                          strcmp(value, "dirty") &&
 480                          strcmp(value, "all") &&
 481                          strcmp(value, "none"))
 482                         warning("Invalid parameter '%s' for config option "
 483                                         "'submodule.%s.ignore'", value, name.buf);
 484                 else {
 485                         free((void *) submodule->ignore);
 486                         submodule->ignore = xstrdup(value);
 487                 }
 488         } else if (!strcmp(item.buf, "url")) {
 489                 if (!value) {
 490                         ret = config_error_nonbool(var);
 491                 } else if (looks_like_command_line_option(value)) {
 492                         warn_command_line_option(var, value);
 493                 } else if (!me->overwrite && submodule->url) {
 494                         warn_multiple_config(me->treeish_name, submodule->name,
 495                                         "url");
 496                 } else {
 497                         free((void *) submodule->url);
 498                         submodule->url = xstrdup(value);
 499                 }
 500         } else if (!strcmp(item.buf, "update")) {
 501                 if (!value)
 502                         ret = config_error_nonbool(var);
 503                 else if (!me->overwrite &&
 504                          submodule->update_strategy.type != SM_UPDATE_UNSPECIFIED)
 505                         warn_multiple_config(me->treeish_name, submodule->name,
 506                                              "update");
 507                 else if (parse_submodule_update_strategy(value,
 508                          &submodule->update_strategy) < 0 ||
 509                          submodule->update_strategy.type == SM_UPDATE_COMMAND)
 510                         die(_("invalid value for '%s'"), var);
 511         } else if (!strcmp(item.buf, "shallow")) {
 512                 if (!me->overwrite && submodule->recommend_shallow != -1)
 513                         warn_multiple_config(me->treeish_name, submodule->name,
 514                                              "shallow");
 515                 else
 516                         submodule->recommend_shallow =
 517                                 git_config_bool(var, value);
 518         } else if (!strcmp(item.buf, "branch")) {
 519                 if (!value)
 520                         ret = config_error_nonbool(var);
 521                 else if (!me->overwrite && submodule->branch)
 522                         warn_multiple_config(me->treeish_name, submodule->name,
 523                                              "branch");
 524                 else {
 525                         free((void *)submodule->branch);
 526                         submodule->branch = xstrdup(value);
 527                 }
 528         }
 529
 530         strbuf_release(&name);
 531         strbuf_release(&item);
 532
 533         return ret;
 534 }
 535
 536 static int gitmodule_oid_from_commit(const struct object_id *treeish_name,
 537                                      struct object_id *gitmodules_oid,
 538                                      struct strbuf *rev)
 539 {
 540         int ret = 0;
 541
 542         if (is_null_oid(treeish_name)) {
 543                 oidclr(gitmodules_oid);
 544                 return 1;
 545         }
 546
 547         strbuf_addf(rev, "%s:.gitmodules", oid_to_hex(treeish_name));
 548         if (repo_get_oid(the_repository, rev->buf, gitmodules_oid) >= 0)
 549                 ret = 1;
 550
 551         return ret;
 552 }
 553
 554 /* This does a lookup of a submodule configuration by name or by path
 555  * (key) with on-demand reading of the appropriate .gitmodules from
 556  * revisions.
 557  */
 558 static const struct submodule *config_from(struct submodule_cache *cache,
 559                 const struct object_id *treeish_name, const char *key,
 560                 enum lookup_type lookup_type)
 561 {
 562         struct strbuf rev = STRBUF_INIT;
 563         unsigned long config_size;
 564         char *config = NULL;
 565         struct object_id oid;
 566         enum object_type type;
 567         const struct submodule *submodule = NULL;
 568         struct parse_config_parameter parameter;
 569
 570         /*
 571          * If any parameter except the cache is a NULL pointer just
 572          * return the first submodule. Can be used to check whether
 573          * there are any submodules parsed.
 574          */
 575         if (!treeish_name || !key) {
 576                 struct hashmap_iter iter;
 577                 struct submodule_entry *entry;
 578
 579                 entry = hashmap_iter_first_entry(&cache->for_name, &iter,
 580                                                 struct submodule_entry,
 581                                                 ent /* member name */);
 582                 if (!entry)
 583                         return NULL;
 584                 return entry->config;
 585         }
 586
 587         if (!gitmodule_oid_from_commit(treeish_name, &oid, &rev))
 588                 goto out;
 589
 590         switch (lookup_type) {
 591         case lookup_name:
 592                 submodule = cache_lookup_name(cache, &oid, key);
 593                 break;
 594         case lookup_path:
 595                 submodule = cache_lookup_path(cache, &oid, key);
 596                 break;
 597         }
 598         if (submodule)
 599                 goto out;
 600
 601         config = repo_read_object_file(the_repository, &oid, &type,
 602                                        &config_size);
 603         if (!config || type != OBJ_BLOB)
 604                 goto out;
 605
 606         /* fill the submodule config into the cache */
 607         parameter.cache = cache;
 608         parameter.treeish_name = treeish_name;
 609         parameter.gitmodules_oid = &oid;
 610         parameter.overwrite = 0;
 611         git_config_from_mem(parse_config, CONFIG_ORIGIN_SUBMODULE_BLOB, rev.buf,
 612                             config, config_size, &parameter, CONFIG_SCOPE_UNKNOWN, NULL);
 613         strbuf_release(&rev);
 614         free(config);
 615
 616         switch (lookup_type) {
 617         case lookup_name:
 618                 return cache_lookup_name(cache, &oid, key);
 619         case lookup_path:
 620                 return cache_lookup_path(cache, &oid, key);
 621         default:
 622                 return NULL;
 623         }
 624
 625 out:
 626         strbuf_release(&rev);
 627         free(config);
 628         return submodule;
 629 }
 630
 631 static void submodule_cache_check_init(struct repository *repo)
 632 {
 633         if (repo->submodule_cache && repo->submodule_cache->initialized)
 634                 return;
 635
 636         if (!repo->submodule_cache)
 637                 repo->submodule_cache = submodule_cache_alloc();
 638
 639         submodule_cache_init(repo->submodule_cache);
 640 }
 641
 642 /*
 643  * Note: This function is private for a reason, the '.gitmodules' file should
 644  * not be used as a mechanism to retrieve arbitrary configuration stored in
 645  * the repository.
 646  *
 647  * Runs the provided config function on the '.gitmodules' file found in the
 648  * working directory.
 649  */
 650 static void config_from_gitmodules(config_fn_t fn, struct repository *repo, void *data)
 651 {
 652         if (repo->worktree) {
 653                 struct git_config_source config_source = {
 654                         0, .scope = CONFIG_SCOPE_SUBMODULE
 655                 };
 656                 const struct config_options opts = { 0 };
 657                 struct object_id oid;
 658                 char *file;
 659                 char *oidstr = NULL;
 660
 661                 file = repo_worktree_path(repo, GITMODULES_FILE);
 662                 if (file_exists(file)) {
 663                         config_source.file = file;
 664                 } else if (repo_get_oid(repo, GITMODULES_INDEX, &oid) >= 0 ||
 665                            repo_get_oid(repo, GITMODULES_HEAD, &oid) >= 0) {
 666                         config_source.blob = oidstr = xstrdup(oid_to_hex(&oid));
 667                         if (repo != the_repository)
 668                                 add_submodule_odb_by_path(repo->objects->odb->path);
 669                 } else {
 670                         goto out;
 671                 }
 672
 673                 config_with_options(fn, data, &config_source, repo, &opts);
 674
 675 out:
 676                 free(oidstr);
 677                 free(file);
 678         }
 679 }
 680
 681 static int gitmodules_cb(const char *var, const char *value,
 682                          const struct config_context *ctx, void *data)
 683 {
 684         struct repository *repo = data;
 685         struct parse_config_parameter parameter;
 686
 687         parameter.cache = repo->submodule_cache;
 688         parameter.treeish_name = NULL;
 689         parameter.gitmodules_oid = null_oid();
 690         parameter.overwrite = 1;
 691
 692         return parse_config(var, value, ctx, &parameter);
 693 }
 694
 695 void repo_read_gitmodules(struct repository *repo, int skip_if_read)
 696 {
 697         submodule_cache_check_init(repo);
 698
 699         if (repo->submodule_cache->gitmodules_read && skip_if_read)
 700                 return;
 701
 702         if (repo_read_index(repo) < 0)
 703                 return;
 704
 705         if (!is_gitmodules_unmerged(repo->index))
 706                 config_from_gitmodules(gitmodules_cb, repo, repo);
 707
 708         repo->submodule_cache->gitmodules_read = 1;
 709 }
 710
 711 void gitmodules_config_oid(const struct object_id *commit_oid)
 712 {
 713         struct strbuf rev = STRBUF_INIT;
 714         struct object_id oid;
 715
 716         submodule_cache_check_init(the_repository);
 717
 718         if (gitmodule_oid_from_commit(commit_oid, &oid, &rev)) {
 719                 git_config_from_blob_oid(gitmodules_cb, rev.buf,
 720                                          the_repository, &oid, the_repository,
 721                                          CONFIG_SCOPE_UNKNOWN);
 722         }
 723         strbuf_release(&rev);
 724
 725         the_repository->submodule_cache->gitmodules_read = 1;
 726 }
 727
 728 const struct submodule *submodule_from_name(struct repository *r,
 729                                             const struct object_id *treeish_name,
 730                 const char *name)
 731 {
 732         repo_read_gitmodules(r, 1);
 733         return config_from(r->submodule_cache, treeish_name, name, lookup_name);
 734 }
 735
 736 const struct submodule *submodule_from_path(struct repository *r,
 737                                             const struct object_id *treeish_name,
 738                 const char *path)
 739 {
 740         repo_read_gitmodules(r, 1);
 741         return config_from(r->submodule_cache, treeish_name, path, lookup_path);
 742 }
 743
 744 /**
 745  * Used internally by submodules_of_tree(). Recurses into 'treeish_name'
 746  * and appends submodule entries to 'out'. The submodule_cache expects
 747  * a root-level treeish_name and paths, so keep track of these values
 748  * with 'root_tree' and 'prefix'.
 749  */
 750 static void traverse_tree_submodules(struct repository *r,
 751                                      const struct object_id *root_tree,
 752                                      char *prefix,
 753                                      const struct object_id *treeish_name,
 754                                      struct submodule_entry_list *out)
 755 {
 756         struct tree_desc tree;
 757         struct submodule_tree_entry *st_entry;
 758         struct name_entry *name_entry;
 759         char *tree_path = NULL;
 760
 761         name_entry = xmalloc(sizeof(*name_entry));
 762
 763         fill_tree_descriptor(r, &tree, treeish_name);
 764         while (tree_entry(&tree, name_entry)) {
 765                 if (prefix)
 766                         tree_path =
 767                                 mkpathdup("%s/%s", prefix, name_entry->path);
 768                 else
 769                         tree_path = xstrdup(name_entry->path);
 770
 771                 if (S_ISGITLINK(name_entry->mode) &&
 772                     is_tree_submodule_active(r, root_tree, tree_path)) {
 773                         ALLOC_GROW(out->entries, out->entry_nr + 1,
 774                                    out->entry_alloc);
 775                         st_entry = &out->entries[out->entry_nr++];
 776
 777                         st_entry->name_entry = xmalloc(sizeof(*st_entry->name_entry));
 778                         *st_entry->name_entry = *name_entry;
 779                         st_entry->submodule =
 780                                 submodule_from_path(r, root_tree, tree_path);
 781                         st_entry->repo = xmalloc(sizeof(*st_entry->repo));
 782                         if (repo_submodule_init(st_entry->repo, r, tree_path,
 783                                                 root_tree))
 784                                 FREE_AND_NULL(st_entry->repo);
 785
 786                 } else if (S_ISDIR(name_entry->mode))
 787                         traverse_tree_submodules(r, root_tree, tree_path,
 788                                                  &name_entry->oid, out);
 789                 free(tree_path);
 790         }
 791 }
 792
 793 void submodules_of_tree(struct repository *r,
 794                         const struct object_id *treeish_name,
 795                         struct submodule_entry_list *out)
 796 {
 797         CALLOC_ARRAY(out->entries, 0);
 798         out->entry_nr = 0;
 799         out->entry_alloc = 0;
 800
 801         traverse_tree_submodules(r, treeish_name, NULL, treeish_name, out);
 802 }
 803
 804 void submodule_free(struct repository *r)
 805 {
 806         if (r->submodule_cache)
 807                 submodule_cache_clear(r->submodule_cache);
 808 }
 809
 810 static int config_print_callback(const char *var, const char *value,
 811                                  const struct config_context *ctx UNUSED,
 812                                  void *cb_data)
 813 {
 814         char *wanted_key = cb_data;
 815
 816         if (!strcmp(wanted_key, var))
 817                 printf("%s\n", value);
 818
 819         return 0;
 820 }
 821
 822 int print_config_from_gitmodules(struct repository *repo, const char *key)
 823 {
 824         int ret;
 825         char *store_key;
 826
 827         ret = git_config_parse_key(key, &store_key, NULL);
 828         if (ret < 0)
 829                 return CONFIG_INVALID_KEY;
 830
 831         config_from_gitmodules(config_print_callback, repo, store_key);
 832
 833         free(store_key);
 834         return 0;
 835 }
 836
 837 int config_set_in_gitmodules_file_gently(const char *key, const char *value)
 838 {
 839         int ret;
 840
 841         ret = git_config_set_in_file_gently(GITMODULES_FILE, key, value);
 842         if (ret < 0)
 843                 /* Maybe the user already did that, don't error out here */
 844                 warning(_("Could not update .gitmodules entry %s"), key);
 845
 846         return ret;
 847 }
 848
 849 struct fetch_config {
 850         int *max_children;
 851         int *recurse_submodules;
 852 };
 853
 854 static int gitmodules_fetch_config(const char *var, const char *value,
 855                                    const struct config_context *ctx,
 856                                    void *cb)
 857 {
 858         struct fetch_config *config = cb;
 859         if (!strcmp(var, "submodule.fetchjobs")) {
 860                 if (config->max_children)
 861                         *(config->max_children) =
 862                                 parse_submodule_fetchjobs(var, value, ctx->kvi);
 863                 return 0;
 864         } else if (!strcmp(var, "fetch.recursesubmodules")) {
 865                 if (config->recurse_submodules)
 866                         *(config->recurse_submodules) =
 867                                 parse_fetch_recurse_submodules_arg(var, value);
 868                 return 0;
 869         }
 870
 871         return 0;
 872 }
 873
 874 void fetch_config_from_gitmodules(int *max_children, int *recurse_submodules)
 875 {
 876         struct fetch_config config = {
 877                 .max_children = max_children,
 878                 .recurse_submodules = recurse_submodules
 879         };
 880         config_from_gitmodules(gitmodules_fetch_config, the_repository, &config);
 881 }
 882
 883 static int gitmodules_update_clone_config(const char *var, const char *value,
 884                                           const struct config_context *ctx,
 885                                           void *cb)
 886 {
 887         int *max_jobs = cb;
 888         if (!strcmp(var, "submodule.fetchjobs"))
 889                 *max_jobs = parse_submodule_fetchjobs(var, value, ctx->kvi);
 890         return 0;
 891 }
 892
 893 void update_clone_config_from_gitmodules(int *max_jobs)
 894 {
 895         config_from_gitmodules(gitmodules_update_clone_config, the_repository, &max_jobs);
 896 }