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 int check_submodule_name(const char *name)
 194 {
 195         /* Disallow empty names */
 196         if (!*name)
 197                 return -1;
 198
 199         /*
 200          * Look for '..' as a path component. Check both '/' and '\\' as
 201          * separators rather than is_dir_sep(), because we want the name rules
 202          * to be consistent across platforms.
 203          */
 204         goto in_component; /* always start inside component */
 205         while (*name) {
 206                 char c = *name++;
 207                 if (c == '/' || c == '\\') {
 208 in_component:
 209                         if (name[0] == '.' && name[1] == '.' &&
 210                             (!name[2] || name[2] == '/' || name[2] == '\\'))
 211                                 return -1;
 212                 }
 213         }
 214
 215         return 0;
 216 }
 217
 218 static int name_and_item_from_var(const char *var, struct strbuf *name,
 219                                   struct strbuf *item)
 220 {
 221         const char *subsection, *key;
 222         int subsection_len, parse;
 223         parse = parse_config_key(var, "submodule", &subsection,
 224                         &subsection_len, &key);
 225         if (parse < 0 || !subsection)
 226                 return 0;
 227
 228         strbuf_add(name, subsection, subsection_len);
 229         if (check_submodule_name(name->buf) < 0) {
 230                 warning(_("ignoring suspicious submodule name: %s"), name->buf);
 231                 strbuf_release(name);
 232                 return 0;
 233         }
 234
 235         strbuf_addstr(item, key);
 236
 237         return 1;
 238 }
 239
 240 static struct submodule *lookup_or_create_by_name(struct submodule_cache *cache,
 241                 const unsigned char *gitmodules_sha1, const char *name)
 242 {
 243         struct submodule *submodule;
 244         struct strbuf name_buf = STRBUF_INIT;
 245
 246         submodule = cache_lookup_name(cache, gitmodules_sha1, name);
 247         if (submodule)
 248                 return submodule;
 249
 250         submodule = xmalloc(sizeof(*submodule));
 251
 252         strbuf_addstr(&name_buf, name);
 253         submodule->name = strbuf_detach(&name_buf, NULL);
 254
 255         submodule->path = NULL;
 256         submodule->url = NULL;
 257         submodule->update_strategy.type = SM_UPDATE_UNSPECIFIED;
 258         submodule->update_strategy.command = NULL;
 259         submodule->fetch_recurse = RECURSE_SUBMODULES_NONE;
 260         submodule->ignore = NULL;
 261         submodule->branch = NULL;
 262         submodule->recommend_shallow = -1;
 263
 264         hashcpy(submodule->gitmodules_sha1, gitmodules_sha1);
 265
 266         cache_add(cache, submodule);
 267
 268         return submodule;
 269 }
 270
 271 static int parse_fetch_recurse(const char *opt, const char *arg,
 272                                int die_on_error)
 273 {
 274         switch (git_parse_maybe_bool(arg)) {
 275         case 1:
 276                 return RECURSE_SUBMODULES_ON;
 277         case 0:
 278                 return RECURSE_SUBMODULES_OFF;
 279         default:
 280                 if (!strcmp(arg, "on-demand"))
 281                         return RECURSE_SUBMODULES_ON_DEMAND;
 282
 283                 if (die_on_error)
 284                         die("bad %s argument: %s", opt, arg);
 285                 else
 286                         return RECURSE_SUBMODULES_ERROR;
 287         }
 288 }
 289
 290 int parse_submodule_fetchjobs(const char *var, const char *value)
 291 {
 292         int fetchjobs = git_config_int(var, value);
 293         if (fetchjobs < 0)
 294                 die(_("negative values not allowed for submodule.fetchjobs"));
 295         return fetchjobs;
 296 }
 297
 298 int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
 299 {
 300         return parse_fetch_recurse(opt, arg, 1);
 301 }
 302
 303 int option_fetch_parse_recurse_submodules(const struct option *opt,
 304                                           const char *arg, int unset)
 305 {
 306         int *v;
 307
 308         if (!opt->value)
 309                 return -1;
 310
 311         v = opt->value;
 312
 313         if (unset) {
 314                 *v = RECURSE_SUBMODULES_OFF;
 315         } else {
 316                 if (arg)
 317                         *v = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
 318                 else
 319                         *v = RECURSE_SUBMODULES_ON;
 320         }
 321         return 0;
 322 }
 323
 324 static int parse_update_recurse(const char *opt, const char *arg,
 325                                 int die_on_error)
 326 {
 327         switch (git_parse_maybe_bool(arg)) {
 328         case 1:
 329                 return RECURSE_SUBMODULES_ON;
 330         case 0:
 331                 return RECURSE_SUBMODULES_OFF;
 332         default:
 333                 if (die_on_error)
 334                         die("bad %s argument: %s", opt, arg);
 335                 return RECURSE_SUBMODULES_ERROR;
 336         }
 337 }
 338
 339 int parse_update_recurse_submodules_arg(const char *opt, const char *arg)
 340 {
 341         return parse_update_recurse(opt, arg, 1);
 342 }
 343
 344 static int parse_push_recurse(const char *opt, const char *arg,
 345                                int die_on_error)
 346 {
 347         switch (git_parse_maybe_bool(arg)) {
 348         case 1:
 349                 /* There's no simple "on" value when pushing */
 350                 if (die_on_error)
 351                         die("bad %s argument: %s", opt, arg);
 352                 else
 353                         return RECURSE_SUBMODULES_ERROR;
 354         case 0:
 355                 return RECURSE_SUBMODULES_OFF;
 356         default:
 357                 if (!strcmp(arg, "on-demand"))
 358                         return RECURSE_SUBMODULES_ON_DEMAND;
 359                 else if (!strcmp(arg, "check"))
 360                         return RECURSE_SUBMODULES_CHECK;
 361                 else if (!strcmp(arg, "only"))
 362                         return RECURSE_SUBMODULES_ONLY;
 363                 else if (die_on_error)
 364                         die("bad %s argument: %s", opt, arg);
 365                 else
 366                         return RECURSE_SUBMODULES_ERROR;
 367         }
 368 }
 369
 370 int parse_push_recurse_submodules_arg(const char *opt, const char *arg)
 371 {
 372         return parse_push_recurse(opt, arg, 1);
 373 }
 374
 375 static void warn_multiple_config(const unsigned char *treeish_name,
 376                                  const char *name, const char *option)
 377 {
 378         const char *commit_string = "WORKTREE";
 379         if (treeish_name)
 380                 commit_string = sha1_to_hex(treeish_name);
 381         warning("%s:.gitmodules, multiple configurations found for "
 382                         "'submodule.%s.%s'. Skipping second one!",
 383                         commit_string, name, option);
 384 }
 385
 386 struct parse_config_parameter {
 387         struct submodule_cache *cache;
 388         const unsigned char *treeish_name;
 389         const unsigned char *gitmodules_sha1;
 390         int overwrite;
 391 };
 392
 393 static int parse_config(const char *var, const char *value, void *data)
 394 {
 395         struct parse_config_parameter *me = data;
 396         struct submodule *submodule;
 397         struct strbuf name = STRBUF_INIT, item = STRBUF_INIT;
 398         int ret = 0;
 399
 400         /* this also ensures that we only parse submodule entries */
 401         if (!name_and_item_from_var(var, &name, &item))
 402                 return 0;
 403
 404         submodule = lookup_or_create_by_name(me->cache,
 405                                              me->gitmodules_sha1,
 406                                              name.buf);
 407
 408         if (!strcmp(item.buf, "path")) {
 409                 if (!value)
 410                         ret = config_error_nonbool(var);
 411                 else if (!me->overwrite && submodule->path)
 412                         warn_multiple_config(me->treeish_name, submodule->name,
 413                                         "path");
 414                 else {
 415                         if (submodule->path)
 416                                 cache_remove_path(me->cache, submodule);
 417                         free((void *) submodule->path);
 418                         submodule->path = xstrdup(value);
 419                         cache_put_path(me->cache, submodule);
 420                 }
 421         } else if (!strcmp(item.buf, "fetchrecursesubmodules")) {
 422                 /* when parsing worktree configurations we can die early */
 423                 int die_on_error = is_null_sha1(me->gitmodules_sha1);
 424                 if (!me->overwrite &&
 425                     submodule->fetch_recurse != RECURSE_SUBMODULES_NONE)
 426                         warn_multiple_config(me->treeish_name, submodule->name,
 427                                         "fetchrecursesubmodules");
 428                 else
 429                         submodule->fetch_recurse = parse_fetch_recurse(
 430                                                                 var, value,
 431                                                                 die_on_error);
 432         } else if (!strcmp(item.buf, "ignore")) {
 433                 if (!value)
 434                         ret = config_error_nonbool(var);
 435                 else if (!me->overwrite && submodule->ignore)
 436                         warn_multiple_config(me->treeish_name, submodule->name,
 437                                         "ignore");
 438                 else if (strcmp(value, "untracked") &&
 439                          strcmp(value, "dirty") &&
 440                          strcmp(value, "all") &&
 441                          strcmp(value, "none"))
 442                         warning("Invalid parameter '%s' for config option "
 443                                         "'submodule.%s.ignore'", value, name.buf);
 444                 else {
 445                         free((void *) submodule->ignore);
 446                         submodule->ignore = xstrdup(value);
 447                 }
 448         } else if (!strcmp(item.buf, "url")) {
 449                 if (!value) {
 450                         ret = config_error_nonbool(var);
 451                 } else if (!me->overwrite && submodule->url) {
 452                         warn_multiple_config(me->treeish_name, submodule->name,
 453                                         "url");
 454                 } else {
 455                         free((void *) submodule->url);
 456                         submodule->url = xstrdup(value);
 457                 }
 458         } else if (!strcmp(item.buf, "update")) {
 459                 if (!value)
 460                         ret = config_error_nonbool(var);
 461                 else if (!me->overwrite &&
 462                          submodule->update_strategy.type != SM_UPDATE_UNSPECIFIED)
 463                         warn_multiple_config(me->treeish_name, submodule->name,
 464                                              "update");
 465                 else if (parse_submodule_update_strategy(value,
 466                          &submodule->update_strategy) < 0)
 467                                 die(_("invalid value for %s"), var);
 468         } else if (!strcmp(item.buf, "shallow")) {
 469                 if (!me->overwrite && submodule->recommend_shallow != -1)
 470                         warn_multiple_config(me->treeish_name, submodule->name,
 471                                              "shallow");
 472                 else
 473                         submodule->recommend_shallow =
 474                                 git_config_bool(var, value);
 475         } else if (!strcmp(item.buf, "branch")) {
 476                 if (!me->overwrite && submodule->branch)
 477                         warn_multiple_config(me->treeish_name, submodule->name,
 478                                              "branch");
 479                 else {
 480                         free((void *)submodule->branch);
 481                         submodule->branch = xstrdup(value);
 482                 }
 483         }
 484
 485         strbuf_release(&name);
 486         strbuf_release(&item);
 487
 488         return ret;
 489 }
 490
 491 static int gitmodule_oid_from_commit(const struct object_id *treeish_name,
 492                                      struct object_id *gitmodules_oid,
 493                                      struct strbuf *rev)
 494 {
 495         int ret = 0;
 496
 497         if (is_null_oid(treeish_name)) {
 498                 oidclr(gitmodules_oid);
 499                 return 1;
 500         }
 501
 502         strbuf_addf(rev, "%s:.gitmodules", oid_to_hex(treeish_name));
 503         if (get_oid(rev->buf, gitmodules_oid) >= 0)
 504                 ret = 1;
 505
 506         return ret;
 507 }
 508
 509 /* This does a lookup of a submodule configuration by name or by path
 510  * (key) with on-demand reading of the appropriate .gitmodules from
 511  * revisions.
 512  */
 513 static const struct submodule *config_from(struct submodule_cache *cache,
 514                 const struct object_id *treeish_name, const char *key,
 515                 enum lookup_type lookup_type)
 516 {
 517         struct strbuf rev = STRBUF_INIT;
 518         unsigned long config_size;
 519         char *config = NULL;
 520         struct object_id oid;
 521         enum object_type type;
 522         const struct submodule *submodule = NULL;
 523         struct parse_config_parameter parameter;
 524
 525         /*
 526          * If any parameter except the cache is a NULL pointer just
 527          * return the first submodule. Can be used to check whether
 528          * there are any submodules parsed.
 529          */
 530         if (!treeish_name || !key) {
 531                 struct hashmap_iter iter;
 532                 struct submodule_entry *entry;
 533
 534                 entry = hashmap_iter_first(&cache->for_name, &iter);
 535                 if (!entry)
 536                         return NULL;
 537                 return entry->config;
 538         }
 539
 540         if (!gitmodule_oid_from_commit(treeish_name, &oid, &rev))
 541                 goto out;
 542
 543         switch (lookup_type) {
 544         case lookup_name:
 545                 submodule = cache_lookup_name(cache, oid.hash, key);
 546                 break;
 547         case lookup_path:
 548                 submodule = cache_lookup_path(cache, oid.hash, key);
 549                 break;
 550         }
 551         if (submodule)
 552                 goto out;
 553
 554         config = read_sha1_file(oid.hash, &type, &config_size);
 555         if (!config || type != OBJ_BLOB)
 556                 goto out;
 557
 558         /* fill the submodule config into the cache */
 559         parameter.cache = cache;
 560         parameter.treeish_name = treeish_name->hash;
 561         parameter.gitmodules_sha1 = oid.hash;
 562         parameter.overwrite = 0;
 563         git_config_from_mem(parse_config, CONFIG_ORIGIN_SUBMODULE_BLOB, rev.buf,
 564                         config, config_size, &parameter);
 565         strbuf_release(&rev);
 566         free(config);
 567
 568         switch (lookup_type) {
 569         case lookup_name:
 570                 return cache_lookup_name(cache, oid.hash, key);
 571         case lookup_path:
 572                 return cache_lookup_path(cache, oid.hash, key);
 573         default:
 574                 return NULL;
 575         }
 576
 577 out:
 578         strbuf_release(&rev);
 579         free(config);
 580         return submodule;
 581 }
 582
 583 static void submodule_cache_check_init(struct repository *repo)
 584 {
 585         if (repo->submodule_cache && repo->submodule_cache->initialized)
 586                 return;
 587
 588         if (!repo->submodule_cache)
 589                 repo->submodule_cache = submodule_cache_alloc();
 590
 591         submodule_cache_init(repo->submodule_cache);
 592 }
 593
 594 static int gitmodules_cb(const char *var, const char *value, void *data)
 595 {
 596         struct repository *repo = data;
 597         struct parse_config_parameter parameter;
 598
 599         parameter.cache = repo->submodule_cache;
 600         parameter.treeish_name = NULL;
 601         parameter.gitmodules_sha1 = null_sha1;
 602         parameter.overwrite = 1;
 603
 604         return parse_config(var, value, &parameter);
 605 }
 606
 607 void repo_read_gitmodules(struct repository *repo)
 608 {
 609         submodule_cache_check_init(repo);
 610
 611         if (repo->worktree) {
 612                 char *gitmodules;
 613
 614                 if (repo_read_index(repo) < 0)
 615                         return;
 616
 617                 gitmodules = repo_worktree_path(repo, GITMODULES_FILE);
 618
 619                 if (!is_gitmodules_unmerged(repo->index))
 620                         git_config_from_file(gitmodules_cb, gitmodules, repo);
 621
 622                 free(gitmodules);
 623         }
 624
 625         repo->submodule_cache->gitmodules_read = 1;
 626 }
 627
 628 void gitmodules_config_oid(const struct object_id *commit_oid)
 629 {
 630         struct strbuf rev = STRBUF_INIT;
 631         struct object_id oid;
 632
 633         submodule_cache_check_init(the_repository);
 634
 635         if (gitmodule_oid_from_commit(commit_oid, &oid, &rev)) {
 636                 git_config_from_blob_oid(gitmodules_cb, rev.buf,
 637                                          &oid, the_repository);
 638         }
 639         strbuf_release(&rev);
 640
 641         the_repository->submodule_cache->gitmodules_read = 1;
 642 }
 643
 644 static void gitmodules_read_check(struct repository *repo)
 645 {
 646         submodule_cache_check_init(repo);
 647
 648         /* read the repo's .gitmodules file if it hasn't been already */
 649         if (!repo->submodule_cache->gitmodules_read)
 650                 repo_read_gitmodules(repo);
 651 }
 652
 653 const struct submodule *submodule_from_name(const struct object_id *treeish_name,
 654                 const char *name)
 655 {
 656         gitmodules_read_check(the_repository);
 657         return config_from(the_repository->submodule_cache, treeish_name, name, lookup_name);
 658 }
 659
 660 const struct submodule *submodule_from_path(const struct object_id *treeish_name,
 661                 const char *path)
 662 {
 663         gitmodules_read_check(the_repository);
 664         return config_from(the_repository->submodule_cache, treeish_name, path, lookup_path);
 665 }
 666
 667 const struct submodule *submodule_from_cache(struct repository *repo,
 668                                              const struct object_id *treeish_name,
 669                                              const char *key)
 670 {
 671         gitmodules_read_check(repo);
 672         return config_from(repo->submodule_cache, treeish_name,
 673                            key, lookup_path);
 674 }
 675
 676 void submodule_free(void)
 677 {
 678         if (the_repository->submodule_cache)
 679                 submodule_cache_clear(the_repository->submodule_cache);
 680 }