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 .gitmodule 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 };
  22
  23 /*
  24  * thin wrapper struct needed to insert 'struct submodule' entries to
  25  * the hashmap
  26  */
  27 struct submodule_entry {
  28         struct hashmap_entry ent;
  29         struct submodule *config;
  30 };
  31
  32 enum lookup_type {
  33         lookup_name,
  34         lookup_path
  35 };
  36
  37 static int config_path_cmp(const void *unused_cmp_data,
  38                            const struct submodule_entry *a,
  39                            const struct submodule_entry *b,
  40                            const void *unused_keydata)
  41 {
  42         return strcmp(a->config->path, b->config->path) ||
  43                hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
  44 }
  45
  46 static int config_name_cmp(const void *unused_cmp_data,
  47                            const struct submodule_entry *a,
  48                            const struct submodule_entry *b,
  49                            const void *unused_keydata)
  50 {
  51         return strcmp(a->config->name, b->config->name) ||
  52                hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
  53 }
  54
  55 static struct submodule_cache *submodule_cache_alloc(void)
  56 {
  57         return xcalloc(1, sizeof(struct submodule_cache));
  58 }
  59
  60 static void submodule_cache_init(struct submodule_cache *cache)
  61 {
  62         hashmap_init(&cache->for_path, (hashmap_cmp_fn) config_path_cmp, NULL, 0);
  63         hashmap_init(&cache->for_name, (hashmap_cmp_fn) config_name_cmp, NULL, 0);
  64         cache->initialized = 1;
  65 }
  66
  67 static void free_one_config(struct submodule_entry *entry)
  68 {
  69         free((void *) entry->config->path);
  70         free((void *) entry->config->name);
  71         free((void *) entry->config->branch);
  72         free((void *) entry->config->update_strategy.command);
  73         free(entry->config);
  74 }
  75
  76 static void submodule_cache_clear(struct submodule_cache *cache)
  77 {
  78         struct hashmap_iter iter;
  79         struct submodule_entry *entry;
  80
  81         if (!cache->initialized)
  82                 return;
  83
  84         /*
  85          * We iterate over the name hash here to be symmetric with the
  86          * allocation of struct submodule entries. Each is allocated by
  87          * their .gitmodule blob sha1 and submodule name.
  88          */
  89         hashmap_iter_init(&cache->for_name, &iter);
  90         while ((entry = hashmap_iter_next(&iter)))
  91                 free_one_config(entry);
  92
  93         hashmap_free(&cache->for_path, 1);
  94         hashmap_free(&cache->for_name, 1);
  95         cache->initialized = 0;
  96 }
  97
  98 void submodule_cache_free(struct submodule_cache *cache)
  99 {
 100         submodule_cache_clear(cache);
 101         free(cache);
 102 }
 103
 104 static unsigned int hash_sha1_string(const unsigned char *sha1,
 105                                      const char *string)
 106 {
 107         return memhash(sha1, 20) + strhash(string);
 108 }
 109
 110 static void cache_put_path(struct submodule_cache *cache,
 111                            struct submodule *submodule)
 112 {
 113         unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
 114                                              submodule->path);
 115         struct submodule_entry *e = xmalloc(sizeof(*e));
 116         hashmap_entry_init(e, hash);
 117         e->config = submodule;
 118         hashmap_put(&cache->for_path, e);
 119 }
 120
 121 static void cache_remove_path(struct submodule_cache *cache,
 122                               struct submodule *submodule)
 123 {
 124         unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
 125                                              submodule->path);
 126         struct submodule_entry e;
 127         struct submodule_entry *removed;
 128         hashmap_entry_init(&e, hash);
 129         e.config = submodule;
 130         removed = hashmap_remove(&cache->for_path, &e, NULL);
 131         free(removed);
 132 }
 133
 134 static void cache_add(struct submodule_cache *cache,
 135                       struct submodule *submodule)
 136 {
 137         unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
 138                                              submodule->name);
 139         struct submodule_entry *e = xmalloc(sizeof(*e));
 140         hashmap_entry_init(e, hash);
 141         e->config = submodule;
 142         hashmap_add(&cache->for_name, e);
 143 }
 144
 145 static const struct submodule *cache_lookup_path(struct submodule_cache *cache,
 146                 const unsigned char *gitmodules_sha1, const char *path)
 147 {
 148         struct submodule_entry *entry;
 149         unsigned int hash = hash_sha1_string(gitmodules_sha1, path);
 150         struct submodule_entry key;
 151         struct submodule key_config;
 152
 153         hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
 154         key_config.path = path;
 155
 156         hashmap_entry_init(&key, hash);
 157         key.config = &key_config;
 158
 159         entry = hashmap_get(&cache->for_path, &key, NULL);
 160         if (entry)
 161                 return entry->config;
 162         return NULL;
 163 }
 164
 165 static struct submodule *cache_lookup_name(struct submodule_cache *cache,
 166                 const unsigned char *gitmodules_sha1, const char *name)
 167 {
 168         struct submodule_entry *entry;
 169         unsigned int hash = hash_sha1_string(gitmodules_sha1, name);
 170         struct submodule_entry key;
 171         struct submodule key_config;
 172
 173         hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
 174         key_config.name = name;
 175
 176         hashmap_entry_init(&key, hash);
 177         key.config = &key_config;
 178
 179         entry = hashmap_get(&cache->for_name, &key, NULL);
 180         if (entry)
 181                 return entry->config;
 182         return NULL;
 183 }
 184
 185 int check_submodule_name(const char *name)
 186 {
 187         /* Disallow empty names */
 188         if (!*name)
 189                 return -1;
 190
 191         /*
 192          * Look for '..' as a path component. Check both '/' and '\\' as
 193          * separators rather than is_dir_sep(), because we want the name rules
 194          * to be consistent across platforms.
 195          */
 196         goto in_component; /* always start inside component */
 197         while (*name) {
 198                 char c = *name++;
 199                 if (c == '/' || c == '\\') {
 200 in_component:
 201                         if (name[0] == '.' && name[1] == '.' &&
 202                             (!name[2] || name[2] == '/' || name[2] == '\\'))
 203                                 return -1;
 204                 }
 205         }
 206
 207         return 0;
 208 }
 209
 210 static int name_and_item_from_var(const char *var, struct strbuf *name,
 211                                   struct strbuf *item)
 212 {
 213         const char *subsection, *key;
 214         int subsection_len, parse;
 215         parse = parse_config_key(var, "submodule", &subsection,
 216                         &subsection_len, &key);
 217         if (parse < 0 || !subsection)
 218                 return 0;
 219
 220         strbuf_add(name, subsection, subsection_len);
 221         if (check_submodule_name(name->buf) < 0) {
 222                 warning(_("ignoring suspicious submodule name: %s"), name->buf);
 223                 strbuf_release(name);
 224                 return 0;
 225         }
 226
 227         strbuf_addstr(item, key);
 228
 229         return 1;
 230 }
 231
 232 static struct submodule *lookup_or_create_by_name(struct submodule_cache *cache,
 233                 const unsigned char *gitmodules_sha1, const char *name)
 234 {
 235         struct submodule *submodule;
 236         struct strbuf name_buf = STRBUF_INIT;
 237
 238         submodule = cache_lookup_name(cache, gitmodules_sha1, name);
 239         if (submodule)
 240                 return submodule;
 241
 242         submodule = xmalloc(sizeof(*submodule));
 243
 244         strbuf_addstr(&name_buf, name);
 245         submodule->name = strbuf_detach(&name_buf, NULL);
 246
 247         submodule->path = NULL;
 248         submodule->url = NULL;
 249         submodule->update_strategy.type = SM_UPDATE_UNSPECIFIED;
 250         submodule->update_strategy.command = NULL;
 251         submodule->fetch_recurse = RECURSE_SUBMODULES_NONE;
 252         submodule->ignore = NULL;
 253         submodule->branch = NULL;
 254         submodule->recommend_shallow = -1;
 255
 256         hashcpy(submodule->gitmodules_sha1, gitmodules_sha1);
 257
 258         cache_add(cache, submodule);
 259
 260         return submodule;
 261 }
 262
 263 static int parse_fetch_recurse(const char *opt, const char *arg,
 264                                int die_on_error)
 265 {
 266         switch (git_config_maybe_bool(opt, arg)) {
 267         case 1:
 268                 return RECURSE_SUBMODULES_ON;
 269         case 0:
 270                 return RECURSE_SUBMODULES_OFF;
 271         default:
 272                 if (!strcmp(arg, "on-demand"))
 273                         return RECURSE_SUBMODULES_ON_DEMAND;
 274
 275                 if (die_on_error)
 276                         die("bad %s argument: %s", opt, arg);
 277                 else
 278                         return RECURSE_SUBMODULES_ERROR;
 279         }
 280 }
 281
 282 int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
 283 {
 284         return parse_fetch_recurse(opt, arg, 1);
 285 }
 286
 287 int option_fetch_parse_recurse_submodules(const struct option *opt,
 288                                           const char *arg, int unset)
 289 {
 290         int *v;
 291
 292         if (!opt->value)
 293                 return -1;
 294
 295         v = opt->value;
 296
 297         if (unset) {
 298                 *v = RECURSE_SUBMODULES_OFF;
 299         } else {
 300                 if (arg)
 301                         *v = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
 302                 else
 303                         *v = RECURSE_SUBMODULES_ON;
 304         }
 305         return 0;
 306 }
 307
 308 static int parse_update_recurse(const char *opt, const char *arg,
 309                                 int die_on_error)
 310 {
 311         switch (git_config_maybe_bool(opt, arg)) {
 312         case 1:
 313                 return RECURSE_SUBMODULES_ON;
 314         case 0:
 315                 return RECURSE_SUBMODULES_OFF;
 316         default:
 317                 if (die_on_error)
 318                         die("bad %s argument: %s", opt, arg);
 319                 return RECURSE_SUBMODULES_ERROR;
 320         }
 321 }
 322
 323 int parse_update_recurse_submodules_arg(const char *opt, const char *arg)
 324 {
 325         return parse_update_recurse(opt, arg, 1);
 326 }
 327
 328 static int parse_push_recurse(const char *opt, const char *arg,
 329                                int die_on_error)
 330 {
 331         switch (git_config_maybe_bool(opt, arg)) {
 332         case 1:
 333                 /* There's no simple "on" value when pushing */
 334                 if (die_on_error)
 335                         die("bad %s argument: %s", opt, arg);
 336                 else
 337                         return RECURSE_SUBMODULES_ERROR;
 338         case 0:
 339                 return RECURSE_SUBMODULES_OFF;
 340         default:
 341                 if (!strcmp(arg, "on-demand"))
 342                         return RECURSE_SUBMODULES_ON_DEMAND;
 343                 else if (!strcmp(arg, "check"))
 344                         return RECURSE_SUBMODULES_CHECK;
 345                 else if (!strcmp(arg, "only"))
 346                         return RECURSE_SUBMODULES_ONLY;
 347                 else if (die_on_error)
 348                         die("bad %s argument: %s", opt, arg);
 349                 else
 350                         return RECURSE_SUBMODULES_ERROR;
 351         }
 352 }
 353
 354 int parse_push_recurse_submodules_arg(const char *opt, const char *arg)
 355 {
 356         return parse_push_recurse(opt, arg, 1);
 357 }
 358
 359 static void warn_multiple_config(const unsigned char *treeish_name,
 360                                  const char *name, const char *option)
 361 {
 362         const char *commit_string = "WORKTREE";
 363         if (treeish_name)
 364                 commit_string = sha1_to_hex(treeish_name);
 365         warning("%s:.gitmodules, multiple configurations found for "
 366                         "'submodule.%s.%s'. Skipping second one!",
 367                         commit_string, name, option);
 368 }
 369
 370 struct parse_config_parameter {
 371         struct submodule_cache *cache;
 372         const unsigned char *treeish_name;
 373         const unsigned char *gitmodules_sha1;
 374         int overwrite;
 375 };
 376
 377 static int parse_config(const char *var, const char *value, void *data)
 378 {
 379         struct parse_config_parameter *me = data;
 380         struct submodule *submodule;
 381         struct strbuf name = STRBUF_INIT, item = STRBUF_INIT;
 382         int ret = 0;
 383
 384         /* this also ensures that we only parse submodule entries */
 385         if (!name_and_item_from_var(var, &name, &item))
 386                 return 0;
 387
 388         submodule = lookup_or_create_by_name(me->cache,
 389                                              me->gitmodules_sha1,
 390                                              name.buf);
 391
 392         if (!strcmp(item.buf, "path")) {
 393                 if (!value)
 394                         ret = config_error_nonbool(var);
 395                 else if (!me->overwrite && submodule->path)
 396                         warn_multiple_config(me->treeish_name, submodule->name,
 397                                         "path");
 398                 else {
 399                         if (submodule->path)
 400                                 cache_remove_path(me->cache, submodule);
 401                         free((void *) submodule->path);
 402                         submodule->path = xstrdup(value);
 403                         cache_put_path(me->cache, submodule);
 404                 }
 405         } else if (!strcmp(item.buf, "fetchrecursesubmodules")) {
 406                 /* when parsing worktree configurations we can die early */
 407                 int die_on_error = is_null_sha1(me->gitmodules_sha1);
 408                 if (!me->overwrite &&
 409                     submodule->fetch_recurse != RECURSE_SUBMODULES_NONE)
 410                         warn_multiple_config(me->treeish_name, submodule->name,
 411                                         "fetchrecursesubmodules");
 412                 else
 413                         submodule->fetch_recurse = parse_fetch_recurse(
 414                                                                 var, value,
 415                                                                 die_on_error);
 416         } else if (!strcmp(item.buf, "ignore")) {
 417                 if (!value)
 418                         ret = config_error_nonbool(var);
 419                 else if (!me->overwrite && submodule->ignore)
 420                         warn_multiple_config(me->treeish_name, submodule->name,
 421                                         "ignore");
 422                 else if (strcmp(value, "untracked") &&
 423                          strcmp(value, "dirty") &&
 424                          strcmp(value, "all") &&
 425                          strcmp(value, "none"))
 426                         warning("Invalid parameter '%s' for config option "
 427                                         "'submodule.%s.ignore'", value, name.buf);
 428                 else {
 429                         free((void *) submodule->ignore);
 430                         submodule->ignore = xstrdup(value);
 431                 }
 432         } else if (!strcmp(item.buf, "url")) {
 433                 if (!value) {
 434                         ret = config_error_nonbool(var);
 435                 } else if (!me->overwrite && submodule->url) {
 436                         warn_multiple_config(me->treeish_name, submodule->name,
 437                                         "url");
 438                 } else {
 439                         free((void *) submodule->url);
 440                         submodule->url = xstrdup(value);
 441                 }
 442         } else if (!strcmp(item.buf, "update")) {
 443                 if (!value)
 444                         ret = config_error_nonbool(var);
 445                 else if (!me->overwrite &&
 446                          submodule->update_strategy.type != SM_UPDATE_UNSPECIFIED)
 447                         warn_multiple_config(me->treeish_name, submodule->name,
 448                                              "update");
 449                 else if (parse_submodule_update_strategy(value,
 450                          &submodule->update_strategy) < 0)
 451                                 die(_("invalid value for %s"), var);
 452         } else if (!strcmp(item.buf, "shallow")) {
 453                 if (!me->overwrite && submodule->recommend_shallow != -1)
 454                         warn_multiple_config(me->treeish_name, submodule->name,
 455                                              "shallow");
 456                 else
 457                         submodule->recommend_shallow =
 458                                 git_config_bool(var, value);
 459         } else if (!strcmp(item.buf, "branch")) {
 460                 if (!me->overwrite && submodule->branch)
 461                         warn_multiple_config(me->treeish_name, submodule->name,
 462                                              "branch");
 463                 else {
 464                         free((void *)submodule->branch);
 465                         submodule->branch = xstrdup(value);
 466                 }
 467         }
 468
 469         strbuf_release(&name);
 470         strbuf_release(&item);
 471
 472         return ret;
 473 }
 474
 475 int gitmodule_sha1_from_commit(const unsigned char *treeish_name,
 476                                       unsigned char *gitmodules_sha1,
 477                                       struct strbuf *rev)
 478 {
 479         int ret = 0;
 480
 481         if (is_null_sha1(treeish_name)) {
 482                 hashclr(gitmodules_sha1);
 483                 return 1;
 484         }
 485
 486         strbuf_addf(rev, "%s:.gitmodules", sha1_to_hex(treeish_name));
 487         if (get_sha1(rev->buf, gitmodules_sha1) >= 0)
 488                 ret = 1;
 489
 490         return ret;
 491 }
 492
 493 /* This does a lookup of a submodule configuration by name or by path
 494  * (key) with on-demand reading of the appropriate .gitmodules from
 495  * revisions.
 496  */
 497 static const struct submodule *config_from(struct submodule_cache *cache,
 498                 const unsigned char *treeish_name, const char *key,
 499                 enum lookup_type lookup_type)
 500 {
 501         struct strbuf rev = STRBUF_INIT;
 502         unsigned long config_size;
 503         char *config = NULL;
 504         unsigned char sha1[20];
 505         enum object_type type;
 506         const struct submodule *submodule = NULL;
 507         struct parse_config_parameter parameter;
 508
 509         /*
 510          * If any parameter except the cache is a NULL pointer just
 511          * return the first submodule. Can be used to check whether
 512          * there are any submodules parsed.
 513          */
 514         if (!treeish_name || !key) {
 515                 struct hashmap_iter iter;
 516                 struct submodule_entry *entry;
 517
 518                 entry = hashmap_iter_first(&cache->for_name, &iter);
 519                 if (!entry)
 520                         return NULL;
 521                 return entry->config;
 522         }
 523
 524         if (!gitmodule_sha1_from_commit(treeish_name, sha1, &rev))
 525                 goto out;
 526
 527         switch (lookup_type) {
 528         case lookup_name:
 529                 submodule = cache_lookup_name(cache, sha1, key);
 530                 break;
 531         case lookup_path:
 532                 submodule = cache_lookup_path(cache, sha1, key);
 533                 break;
 534         }
 535         if (submodule)
 536                 goto out;
 537
 538         config = read_sha1_file(sha1, &type, &config_size);
 539         if (!config || type != OBJ_BLOB)
 540                 goto out;
 541
 542         /* fill the submodule config into the cache */
 543         parameter.cache = cache;
 544         parameter.treeish_name = treeish_name;
 545         parameter.gitmodules_sha1 = sha1;
 546         parameter.overwrite = 0;
 547         git_config_from_mem(parse_config, CONFIG_ORIGIN_SUBMODULE_BLOB, rev.buf,
 548                         config, config_size, &parameter);
 549         strbuf_release(&rev);
 550         free(config);
 551
 552         switch (lookup_type) {
 553         case lookup_name:
 554                 return cache_lookup_name(cache, sha1, key);
 555         case lookup_path:
 556                 return cache_lookup_path(cache, sha1, key);
 557         default:
 558                 return NULL;
 559         }
 560
 561 out:
 562         strbuf_release(&rev);
 563         free(config);
 564         return submodule;
 565 }
 566
 567 static void submodule_cache_check_init(struct repository *repo)
 568 {
 569         if (repo->submodule_cache && repo->submodule_cache->initialized)
 570                 return;
 571
 572         if (!repo->submodule_cache)
 573                 repo->submodule_cache = submodule_cache_alloc();
 574
 575         submodule_cache_init(repo->submodule_cache);
 576 }
 577
 578 int submodule_config_option(struct repository *repo,
 579                             const char *var, const char *value)
 580 {
 581         struct parse_config_parameter parameter;
 582
 583         submodule_cache_check_init(repo);
 584
 585         parameter.cache = repo->submodule_cache;
 586         parameter.treeish_name = NULL;
 587         parameter.gitmodules_sha1 = null_sha1;
 588         parameter.overwrite = 1;
 589
 590         return parse_config(var, value, &parameter);
 591 }
 592
 593 int parse_submodule_config_option(const char *var, const char *value)
 594 {
 595         return submodule_config_option(the_repository, var, value);
 596 }
 597
 598 const struct submodule *submodule_from_name(const unsigned char *treeish_name,
 599                 const char *name)
 600 {
 601         submodule_cache_check_init(the_repository);
 602         return config_from(the_repository->submodule_cache, treeish_name, name, lookup_name);
 603 }
 604
 605 const struct submodule *submodule_from_path(const unsigned char *treeish_name,
 606                 const char *path)
 607 {
 608         submodule_cache_check_init(the_repository);
 609         return config_from(the_repository->submodule_cache, treeish_name, path, lookup_path);
 610 }
 611
 612 const struct submodule *submodule_from_cache(struct repository *repo,
 613                                              const unsigned char *treeish_name,
 614                                              const char *key)
 615 {
 616         submodule_cache_check_init(repo);
 617         return config_from(repo->submodule_cache, treeish_name,
 618                            key, lookup_path);
 619 }
 620
 621 void submodule_free(void)
 622 {
 623         if (the_repository->submodule_cache)
 624                 submodule_cache_clear(the_repository->submodule_cache);
 625 }