submodule-config.c

   1 #include "cache.h"
   2 #include "repository.h"
   3 #include "config.h"
   4 #include "submodule-config.h"
   5 #include "submodule.h"
   6 #include "strbuf.h"
   7 #include "parse-options.h"
   8
   9 /*
  10  * submodule cache lookup structure
  11  * There is one shared set of 'struct submodule' entries which can be
  12  * looked up by their sha1 blob id of the .gitmodules file and either
  13  * using path or name as key.
  14  * for_path stores submodule entries with path as key
  15  * for_name stores submodule entries with name as key
  16  */
  17 struct submodule_cache {
  18         struct hashmap for_path;
  19         struct hashmap for_name;
  20         unsigned initialized:1;
  21         unsigned gitmodules_read:1;
  22 };
  23
  24 /*
  25  * thin wrapper struct needed to insert 'struct submodule' entries to
  26  * the hashmap
  27  */
  28 struct submodule_entry {
  29         struct hashmap_entry ent;
  30         struct submodule *config;
  31 };
  32
  33 enum lookup_type {
  34         lookup_name,
  35         lookup_path
  36 };
  37
  38 static int config_path_cmp(const void *unused_cmp_data,
  39                            const void *entry,
  40                            const void *entry_or_key,
  41                            const void *unused_keydata)
  42 {
  43         const struct submodule_entry *a = entry;
  44         const struct submodule_entry *b = entry_or_key;
  45
  46         return strcmp(a->config->path, b->config->path) ||
  47                hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
  48 }
  49
  50 static int config_name_cmp(const void *unused_cmp_data,
  51                            const void *entry,
  52                            const void *entry_or_key,
  53                            const void *unused_keydata)
  54 {
  55         const struct submodule_entry *a = entry;
  56         const struct submodule_entry *b = entry_or_key;
  57
  58         return strcmp(a->config->name, b->config->name) ||
  59                hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
  60 }
  61
  62 static struct submodule_cache *submodule_cache_alloc(void)
  63 {
  64         return xcalloc(1, sizeof(struct submodule_cache));
  65 }
  66
  67 static void submodule_cache_init(struct submodule_cache *cache)
  68 {
  69         hashmap_init(&cache->for_path, config_path_cmp, NULL, 0);
  70         hashmap_init(&cache->for_name, config_name_cmp, NULL, 0);
  71         cache->initialized = 1;
  72 }
  73
  74 static void free_one_config(struct submodule_entry *entry)
  75 {
  76         free((void *) entry->config->path);
  77         free((void *) entry->config->name);
  78         free((void *) entry->config->branch);
  79         free((void *) entry->config->update_strategy.command);
  80         free(entry->config);
  81 }
  82
  83 static void submodule_cache_clear(struct submodule_cache *cache)
  84 {
  85         struct hashmap_iter iter;
  86         struct submodule_entry *entry;
  87
  88         if (!cache->initialized)
  89                 return;
  90
  91         /*
  92          * We iterate over the name hash here to be symmetric with the
  93          * allocation of struct submodule entries. Each is allocated by
  94          * their .gitmodules blob sha1 and submodule name.
  95          */
  96         hashmap_iter_init(&cache->for_name, &iter);
  97         while ((entry = hashmap_iter_next(&iter)))
  98                 free_one_config(entry);
  99
 100         hashmap_free(&cache->for_path, 1);
 101         hashmap_free(&cache->for_name, 1);
 102         cache->initialized = 0;
 103         cache->gitmodules_read = 0;
 104 }
 105
 106 void submodule_cache_free(struct submodule_cache *cache)
 107 {
 108         submodule_cache_clear(cache);
 109         free(cache);
 110 }
 111
 112 static unsigned int hash_sha1_string(const unsigned char *sha1,
 113                                      const char *string)
 114 {
 115         return memhash(sha1, 20) + strhash(string);
 116 }
 117
 118 static void cache_put_path(struct submodule_cache *cache,
 119                            struct submodule *submodule)
 120 {
 121         unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
 122                                              submodule->path);
 123         struct submodule_entry *e = xmalloc(sizeof(*e));
 124         hashmap_entry_init(e, hash);
 125         e->config = submodule;
 126         hashmap_put(&cache->for_path, e);
 127 }
 128
 129 static void cache_remove_path(struct submodule_cache *cache,
 130                               struct submodule *submodule)
 131 {
 132         unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
 133                                              submodule->path);
 134         struct submodule_entry e;
 135         struct submodule_entry *removed;
 136         hashmap_entry_init(&e, hash);
 137         e.config = submodule;
 138         removed = hashmap_remove(&cache->for_path, &e, NULL);
 139         free(removed);
 140 }
 141
 142 static void cache_add(struct submodule_cache *cache,
 143                       struct submodule *submodule)
 144 {
 145         unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
 146                                              submodule->name);
 147         struct submodule_entry *e = xmalloc(sizeof(*e));
 148         hashmap_entry_init(e, hash);
 149         e->config = submodule;
 150         hashmap_add(&cache->for_name, e);
 151 }
 152
 153 static const struct submodule *cache_lookup_path(struct submodule_cache *cache,
 154                 const unsigned char *gitmodules_sha1, const char *path)
 155 {
 156         struct submodule_entry *entry;
 157         unsigned int hash = hash_sha1_string(gitmodules_sha1, path);
 158         struct submodule_entry key;
 159         struct submodule key_config;
 160
 161         hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
 162         key_config.path = path;
 163
 164         hashmap_entry_init(&key, hash);
 165         key.config = &key_config;
 166
 167         entry = hashmap_get(&cache->for_path, &key, NULL);
 168         if (entry)
 169                 return entry->config;
 170         return NULL;
 171 }
 172
 173 static struct submodule *cache_lookup_name(struct submodule_cache *cache,
 174                 const unsigned char *gitmodules_sha1, const char *name)
 175 {
 176         struct submodule_entry *entry;
 177         unsigned int hash = hash_sha1_string(gitmodules_sha1, name);
 178         struct submodule_entry key;
 179         struct submodule key_config;
 180
 181         hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
 182         key_config.name = name;
 183
 184         hashmap_entry_init(&key, hash);
 185         key.config = &key_config;
 186
 187         entry = hashmap_get(&cache->for_name, &key, NULL);
 188         if (entry)
 189                 return entry->config;
 190         return NULL;
 191 }
 192
 193 static int name_and_item_from_var(const char *var, struct strbuf *name,
 194                                   struct strbuf *item)
 195 {
 196         const char *subsection, *key;
 197         int subsection_len, parse;
 198         parse = parse_config_key(var, "submodule", &subsection,
 199                         &subsection_len, &key);
 200         if (parse < 0 || !subsection)
 201                 return 0;
 202
 203         strbuf_add(name, subsection, subsection_len);
 204         strbuf_addstr(item, key);
 205
 206         return 1;
 207 }
 208
 209 static struct submodule *lookup_or_create_by_name(struct submodule_cache *cache,
 210                 const unsigned char *gitmodules_sha1, const char *name)
 211 {
 212         struct submodule *submodule;
 213         struct strbuf name_buf = STRBUF_INIT;
 214
 215         submodule = cache_lookup_name(cache, gitmodules_sha1, name);
 216         if (submodule)
 217                 return submodule;
 218
 219         submodule = xmalloc(sizeof(*submodule));
 220
 221         strbuf_addstr(&name_buf, name);
 222         submodule->name = strbuf_detach(&name_buf, NULL);
 223
 224         submodule->path = NULL;
 225         submodule->url = NULL;
 226         submodule->update_strategy.type = SM_UPDATE_UNSPECIFIED;
 227         submodule->update_strategy.command = NULL;
 228         submodule->fetch_recurse = RECURSE_SUBMODULES_NONE;
 229         submodule->ignore = NULL;
 230         submodule->branch = NULL;
 231         submodule->recommend_shallow = -1;
 232
 233         hashcpy(submodule->gitmodules_sha1, gitmodules_sha1);
 234
 235         cache_add(cache, submodule);
 236
 237         return submodule;
 238 }
 239
 240 static int parse_fetch_recurse(const char *opt, const char *arg,
 241                                int die_on_error)
 242 {
 243         switch (git_parse_maybe_bool(arg)) {
 244         case 1:
 245                 return RECURSE_SUBMODULES_ON;
 246         case 0:
 247                 return RECURSE_SUBMODULES_OFF;
 248         default:
 249                 if (!strcmp(arg, "on-demand"))
 250                         return RECURSE_SUBMODULES_ON_DEMAND;
 251
 252                 if (die_on_error)
 253                         die("bad %s argument: %s", opt, arg);
 254                 else
 255                         return RECURSE_SUBMODULES_ERROR;
 256         }
 257 }
 258
 259 int parse_submodule_fetchjobs(const char *var, const char *value)
 260 {
 261         int fetchjobs = git_config_int(var, value);
 262         if (fetchjobs < 0)
 263                 die(_("negative values not allowed for submodule.fetchjobs"));
 264         return fetchjobs;
 265 }
 266
 267 int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
 268 {
 269         return parse_fetch_recurse(opt, arg, 1);
 270 }
 271
 272 int option_fetch_parse_recurse_submodules(const struct option *opt,
 273                                           const char *arg, int unset)
 274 {
 275         int *v;
 276
 277         if (!opt->value)
 278                 return -1;
 279
 280         v = opt->value;
 281
 282         if (unset) {
 283                 *v = RECURSE_SUBMODULES_OFF;
 284         } else {
 285                 if (arg)
 286                         *v = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
 287                 else
 288                         *v = RECURSE_SUBMODULES_ON;
 289         }
 290         return 0;
 291 }
 292
 293 static int parse_update_recurse(const char *opt, const char *arg,
 294                                 int die_on_error)
 295 {
 296         switch (git_parse_maybe_bool(arg)) {
 297         case 1:
 298                 return RECURSE_SUBMODULES_ON;
 299         case 0:
 300                 return RECURSE_SUBMODULES_OFF;
 301         default:
 302                 if (die_on_error)
 303                         die("bad %s argument: %s", opt, arg);
 304                 return RECURSE_SUBMODULES_ERROR;
 305         }
 306 }
 307
 308 int parse_update_recurse_submodules_arg(const char *opt, const char *arg)
 309 {
 310         return parse_update_recurse(opt, arg, 1);
 311 }
 312
 313 static int parse_push_recurse(const char *opt, const char *arg,
 314                                int die_on_error)
 315 {
 316         switch (git_parse_maybe_bool(arg)) {
 317         case 1:
 318                 /* There's no simple "on" value when pushing */
 319                 if (die_on_error)
 320                         die("bad %s argument: %s", opt, arg);
 321                 else
 322                         return RECURSE_SUBMODULES_ERROR;
 323         case 0:
 324                 return RECURSE_SUBMODULES_OFF;
 325         default:
 326                 if (!strcmp(arg, "on-demand"))
 327                         return RECURSE_SUBMODULES_ON_DEMAND;
 328                 else if (!strcmp(arg, "check"))
 329                         return RECURSE_SUBMODULES_CHECK;
 330                 else if (!strcmp(arg, "only"))
 331                         return RECURSE_SUBMODULES_ONLY;
 332                 else if (die_on_error)
 333                         die("bad %s argument: %s", opt, arg);
 334                 else
 335                         return RECURSE_SUBMODULES_ERROR;
 336         }
 337 }
 338
 339 int parse_push_recurse_submodules_arg(const char *opt, const char *arg)
 340 {
 341         return parse_push_recurse(opt, arg, 1);
 342 }
 343
 344 static void warn_multiple_config(const unsigned char *treeish_name,
 345                                  const char *name, const char *option)
 346 {
 347         const char *commit_string = "WORKTREE";
 348         if (treeish_name)
 349                 commit_string = sha1_to_hex(treeish_name);
 350         warning("%s:.gitmodules, multiple configurations found for "
 351                         "'submodule.%s.%s'. Skipping second one!",
 352                         commit_string, name, option);
 353 }
 354
 355 struct parse_config_parameter {
 356         struct submodule_cache *cache;
 357         const unsigned char *treeish_name;
 358         const unsigned char *gitmodules_sha1;
 359         int overwrite;
 360 };
 361
 362 static int parse_config(const char *var, const char *value, void *data)
 363 {
 364         struct parse_config_parameter *me = data;
 365         struct submodule *submodule;
 366         struct strbuf name = STRBUF_INIT, item = STRBUF_INIT;
 367         int ret = 0;
 368
 369         /* this also ensures that we only parse submodule entries */
 370         if (!name_and_item_from_var(var, &name, &item))
 371                 return 0;
 372
 373         submodule = lookup_or_create_by_name(me->cache,
 374                                              me->gitmodules_sha1,
 375                                              name.buf);
 376
 377         if (!strcmp(item.buf, "path")) {
 378                 if (!value)
 379                         ret = config_error_nonbool(var);
 380                 else if (!me->overwrite && submodule->path)
 381                         warn_multiple_config(me->treeish_name, submodule->name,
 382                                         "path");
 383                 else {
 384                         if (submodule->path)
 385                                 cache_remove_path(me->cache, submodule);
 386                         free((void *) submodule->path);
 387                         submodule->path = xstrdup(value);
 388                         cache_put_path(me->cache, submodule);
 389                 }
 390         } else if (!strcmp(item.buf, "fetchrecursesubmodules")) {
 391                 /* when parsing worktree configurations we can die early */
 392                 int die_on_error = is_null_sha1(me->gitmodules_sha1);
 393                 if (!me->overwrite &&
 394                     submodule->fetch_recurse != RECURSE_SUBMODULES_NONE)
 395                         warn_multiple_config(me->treeish_name, submodule->name,
 396                                         "fetchrecursesubmodules");
 397                 else
 398                         submodule->fetch_recurse = parse_fetch_recurse(
 399                                                                 var, value,
 400                                                                 die_on_error);
 401         } else if (!strcmp(item.buf, "ignore")) {
 402                 if (!value)
 403                         ret = config_error_nonbool(var);
 404                 else if (!me->overwrite && submodule->ignore)
 405                         warn_multiple_config(me->treeish_name, submodule->name,
 406                                         "ignore");
 407                 else if (strcmp(value, "untracked") &&
 408                          strcmp(value, "dirty") &&
 409                          strcmp(value, "all") &&
 410                          strcmp(value, "none"))
 411                         warning("Invalid parameter '%s' for config option "
 412                                         "'submodule.%s.ignore'", value, name.buf);
 413                 else {
 414                         free((void *) submodule->ignore);
 415                         submodule->ignore = xstrdup(value);
 416                 }
 417         } else if (!strcmp(item.buf, "url")) {
 418                 if (!value) {
 419                         ret = config_error_nonbool(var);
 420                 } else if (!me->overwrite && submodule->url) {
 421                         warn_multiple_config(me->treeish_name, submodule->name,
 422                                         "url");
 423                 } else {
 424                         free((void *) submodule->url);
 425                         submodule->url = xstrdup(value);
 426                 }
 427         } else if (!strcmp(item.buf, "update")) {
 428                 if (!value)
 429                         ret = config_error_nonbool(var);
 430                 else if (!me->overwrite &&
 431                          submodule->update_strategy.type != SM_UPDATE_UNSPECIFIED)
 432                         warn_multiple_config(me->treeish_name, submodule->name,
 433                                              "update");
 434                 else if (parse_submodule_update_strategy(value,
 435                          &submodule->update_strategy) < 0)
 436                                 die(_("invalid value for %s"), var);
 437         } else if (!strcmp(item.buf, "shallow")) {
 438                 if (!me->overwrite && submodule->recommend_shallow != -1)
 439                         warn_multiple_config(me->treeish_name, submodule->name,
 440                                              "shallow");
 441                 else
 442                         submodule->recommend_shallow =
 443                                 git_config_bool(var, value);
 444         } else if (!strcmp(item.buf, "branch")) {
 445                 if (!me->overwrite && submodule->branch)
 446                         warn_multiple_config(me->treeish_name, submodule->name,
 447                                              "branch");
 448                 else {
 449                         free((void *)submodule->branch);
 450                         submodule->branch = xstrdup(value);
 451                 }
 452         }
 453
 454         strbuf_release(&name);
 455         strbuf_release(&item);
 456
 457         return ret;
 458 }
 459
 460 static int gitmodule_oid_from_commit(const struct object_id *treeish_name,
 461                                      struct object_id *gitmodules_oid,
 462                                      struct strbuf *rev)
 463 {
 464         int ret = 0;
 465
 466         if (is_null_oid(treeish_name)) {
 467                 oidclr(gitmodules_oid);
 468                 return 1;
 469         }
 470
 471         strbuf_addf(rev, "%s:.gitmodules", oid_to_hex(treeish_name));
 472         if (get_oid(rev->buf, gitmodules_oid) >= 0)
 473                 ret = 1;
 474
 475         return ret;
 476 }
 477
 478 /* This does a lookup of a submodule configuration by name or by path
 479  * (key) with on-demand reading of the appropriate .gitmodules from
 480  * revisions.
 481  */
 482 static const struct submodule *config_from(struct submodule_cache *cache,
 483                 const struct object_id *treeish_name, const char *key,
 484                 enum lookup_type lookup_type)
 485 {
 486         struct strbuf rev = STRBUF_INIT;
 487         unsigned long config_size;
 488         char *config = NULL;
 489         struct object_id oid;
 490         enum object_type type;
 491         const struct submodule *submodule = NULL;
 492         struct parse_config_parameter parameter;
 493
 494         /*
 495          * If any parameter except the cache is a NULL pointer just
 496          * return the first submodule. Can be used to check whether
 497          * there are any submodules parsed.
 498          */
 499         if (!treeish_name || !key) {
 500                 struct hashmap_iter iter;
 501                 struct submodule_entry *entry;
 502
 503                 entry = hashmap_iter_first(&cache->for_name, &iter);
 504                 if (!entry)
 505                         return NULL;
 506                 return entry->config;
 507         }
 508
 509         if (!gitmodule_oid_from_commit(treeish_name, &oid, &rev))
 510                 goto out;
 511
 512         switch (lookup_type) {
 513         case lookup_name:
 514                 submodule = cache_lookup_name(cache, oid.hash, key);
 515                 break;
 516         case lookup_path:
 517                 submodule = cache_lookup_path(cache, oid.hash, key);
 518                 break;
 519         }
 520         if (submodule)
 521                 goto out;
 522
 523         config = read_sha1_file(oid.hash, &type, &config_size);
 524         if (!config || type != OBJ_BLOB)
 525                 goto out;
 526
 527         /* fill the submodule config into the cache */
 528         parameter.cache = cache;
 529         parameter.treeish_name = treeish_name->hash;
 530         parameter.gitmodules_sha1 = oid.hash;
 531         parameter.overwrite = 0;
 532         git_config_from_mem(parse_config, CONFIG_ORIGIN_SUBMODULE_BLOB, rev.buf,
 533                         config, config_size, &parameter);
 534         strbuf_release(&rev);
 535         free(config);
 536
 537         switch (lookup_type) {
 538         case lookup_name:
 539                 return cache_lookup_name(cache, oid.hash, key);
 540         case lookup_path:
 541                 return cache_lookup_path(cache, oid.hash, key);
 542         default:
 543                 return NULL;
 544         }
 545
 546 out:
 547         strbuf_release(&rev);
 548         free(config);
 549         return submodule;
 550 }
 551
 552 static void submodule_cache_check_init(struct repository *repo)
 553 {
 554         if (repo->submodule_cache && repo->submodule_cache->initialized)
 555                 return;
 556
 557         if (!repo->submodule_cache)
 558                 repo->submodule_cache = submodule_cache_alloc();
 559
 560         submodule_cache_init(repo->submodule_cache);
 561 }
 562
 563 static int gitmodules_cb(const char *var, const char *value, void *data)
 564 {
 565         struct repository *repo = data;
 566         struct parse_config_parameter parameter;
 567
 568         parameter.cache = repo->submodule_cache;
 569         parameter.treeish_name = NULL;
 570         parameter.gitmodules_sha1 = null_sha1;
 571         parameter.overwrite = 1;
 572
 573         return parse_config(var, value, &parameter);
 574 }
 575
 576 void repo_read_gitmodules(struct repository *repo)
 577 {
 578         submodule_cache_check_init(repo);
 579
 580         if (repo->worktree) {
 581                 char *gitmodules;
 582
 583                 if (repo_read_index(repo) < 0)
 584                         return;
 585
 586                 gitmodules = repo_worktree_path(repo, GITMODULES_FILE);
 587
 588                 if (!is_gitmodules_unmerged(repo->index))
 589                         git_config_from_file(gitmodules_cb, gitmodules, repo);
 590
 591                 free(gitmodules);
 592         }
 593
 594         repo->submodule_cache->gitmodules_read = 1;
 595 }
 596
 597 void gitmodules_config_oid(const struct object_id *commit_oid)
 598 {
 599         struct strbuf rev = STRBUF_INIT;
 600         struct object_id oid;
 601
 602         submodule_cache_check_init(the_repository);
 603
 604         if (gitmodule_oid_from_commit(commit_oid, &oid, &rev)) {
 605                 git_config_from_blob_oid(gitmodules_cb, rev.buf,
 606                                          &oid, the_repository);
 607         }
 608         strbuf_release(&rev);
 609
 610         the_repository->submodule_cache->gitmodules_read = 1;
 611 }
 612
 613 static void gitmodules_read_check(struct repository *repo)
 614 {
 615         submodule_cache_check_init(repo);
 616
 617         /* read the repo's .gitmodules file if it hasn't been already */
 618         if (!repo->submodule_cache->gitmodules_read)
 619                 repo_read_gitmodules(repo);
 620 }
 621
 622 const struct submodule *submodule_from_name(const struct object_id *treeish_name,
 623                 const char *name)
 624 {
 625         gitmodules_read_check(the_repository);
 626         return config_from(the_repository->submodule_cache, treeish_name, name, lookup_name);
 627 }
 628
 629 const struct submodule *submodule_from_path(const struct object_id *treeish_name,
 630                 const char *path)
 631 {
 632         gitmodules_read_check(the_repository);
 633         return config_from(the_repository->submodule_cache, treeish_name, path, lookup_path);
 634 }
 635
 636 const struct submodule *submodule_from_cache(struct repository *repo,
 637                                              const struct object_id *treeish_name,
 638                                              const char *key)
 639 {
 640         gitmodules_read_check(repo);
 641         return config_from(repo->submodule_cache, treeish_name,
 642                            key, lookup_path);
 643 }
 644
 645 void submodule_free(void)
 646 {
 647         if (the_repository->submodule_cache)
 648                 submodule_cache_clear(the_repository->submodule_cache);
 649 }