submodule-config.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "submodule-config.h"
   4 #include "submodule.h"
   5 #include "strbuf.h"
   6
   7 /*
   8  * submodule cache lookup structure
   9  * There is one shared set of 'struct submodule' entries which can be
  10  * looked up by their sha1 blob id of the .gitmodule file and either
  11  * using path or name as key.
  12  * for_path stores submodule entries with path as key
  13  * for_name stores submodule entries with name as key
  14  */
  15 struct submodule_cache {
  16         struct hashmap for_path;
  17         struct hashmap for_name;
  18 };
  19
  20 /*
  21  * thin wrapper struct needed to insert 'struct submodule' entries to
  22  * the hashmap
  23  */
  24 struct submodule_entry {
  25         struct hashmap_entry ent;
  26         struct submodule *config;
  27 };
  28
  29 enum lookup_type {
  30         lookup_name,
  31         lookup_path
  32 };
  33
  34 static struct submodule_cache the_submodule_cache;
  35 static int is_cache_init;
  36
  37 static int config_path_cmp(const struct submodule_entry *a,
  38                            const struct submodule_entry *b,
  39                            const void *unused)
  40 {
  41         return strcmp(a->config->path, b->config->path) ||
  42                hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
  43 }
  44
  45 static int config_name_cmp(const struct submodule_entry *a,
  46                            const struct submodule_entry *b,
  47                            const void *unused)
  48 {
  49         return strcmp(a->config->name, b->config->name) ||
  50                hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
  51 }
  52
  53 static void cache_init(struct submodule_cache *cache)
  54 {
  55         hashmap_init(&cache->for_path, (hashmap_cmp_fn) config_path_cmp, 0);
  56         hashmap_init(&cache->for_name, (hashmap_cmp_fn) config_name_cmp, 0);
  57 }
  58
  59 static void free_one_config(struct submodule_entry *entry)
  60 {
  61         free((void *) entry->config->path);
  62         free((void *) entry->config->name);
  63         free((void *) entry->config->branch);
  64         free((void *) entry->config->update_strategy.command);
  65         free(entry->config);
  66 }
  67
  68 static void cache_free(struct submodule_cache *cache)
  69 {
  70         struct hashmap_iter iter;
  71         struct submodule_entry *entry;
  72
  73         /*
  74          * We iterate over the name hash here to be symmetric with the
  75          * allocation of struct submodule entries. Each is allocated by
  76          * their .gitmodule blob sha1 and submodule name.
  77          */
  78         hashmap_iter_init(&cache->for_name, &iter);
  79         while ((entry = hashmap_iter_next(&iter)))
  80                 free_one_config(entry);
  81
  82         hashmap_free(&cache->for_path, 1);
  83         hashmap_free(&cache->for_name, 1);
  84 }
  85
  86 static unsigned int hash_sha1_string(const unsigned char *sha1,
  87                                      const char *string)
  88 {
  89         return memhash(sha1, 20) + strhash(string);
  90 }
  91
  92 static void cache_put_path(struct submodule_cache *cache,
  93                            struct submodule *submodule)
  94 {
  95         unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
  96                                              submodule->path);
  97         struct submodule_entry *e = xmalloc(sizeof(*e));
  98         hashmap_entry_init(e, hash);
  99         e->config = submodule;
 100         hashmap_put(&cache->for_path, e);
 101 }
 102
 103 static void cache_remove_path(struct submodule_cache *cache,
 104                               struct submodule *submodule)
 105 {
 106         unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
 107                                              submodule->path);
 108         struct submodule_entry e;
 109         struct submodule_entry *removed;
 110         hashmap_entry_init(&e, hash);
 111         e.config = submodule;
 112         removed = hashmap_remove(&cache->for_path, &e, NULL);
 113         free(removed);
 114 }
 115
 116 static void cache_add(struct submodule_cache *cache,
 117                       struct submodule *submodule)
 118 {
 119         unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
 120                                              submodule->name);
 121         struct submodule_entry *e = xmalloc(sizeof(*e));
 122         hashmap_entry_init(e, hash);
 123         e->config = submodule;
 124         hashmap_add(&cache->for_name, e);
 125 }
 126
 127 static const struct submodule *cache_lookup_path(struct submodule_cache *cache,
 128                 const unsigned char *gitmodules_sha1, const char *path)
 129 {
 130         struct submodule_entry *entry;
 131         unsigned int hash = hash_sha1_string(gitmodules_sha1, path);
 132         struct submodule_entry key;
 133         struct submodule key_config;
 134
 135         hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
 136         key_config.path = path;
 137
 138         hashmap_entry_init(&key, hash);
 139         key.config = &key_config;
 140
 141         entry = hashmap_get(&cache->for_path, &key, NULL);
 142         if (entry)
 143                 return entry->config;
 144         return NULL;
 145 }
 146
 147 static struct submodule *cache_lookup_name(struct submodule_cache *cache,
 148                 const unsigned char *gitmodules_sha1, const char *name)
 149 {
 150         struct submodule_entry *entry;
 151         unsigned int hash = hash_sha1_string(gitmodules_sha1, name);
 152         struct submodule_entry key;
 153         struct submodule key_config;
 154
 155         hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
 156         key_config.name = name;
 157
 158         hashmap_entry_init(&key, hash);
 159         key.config = &key_config;
 160
 161         entry = hashmap_get(&cache->for_name, &key, NULL);
 162         if (entry)
 163                 return entry->config;
 164         return NULL;
 165 }
 166
 167 static int name_and_item_from_var(const char *var, struct strbuf *name,
 168                                   struct strbuf *item)
 169 {
 170         const char *subsection, *key;
 171         int subsection_len, parse;
 172         parse = parse_config_key(var, "submodule", &subsection,
 173                         &subsection_len, &key);
 174         if (parse < 0 || !subsection)
 175                 return 0;
 176
 177         strbuf_add(name, subsection, subsection_len);
 178         strbuf_addstr(item, key);
 179
 180         return 1;
 181 }
 182
 183 static struct submodule *lookup_or_create_by_name(struct submodule_cache *cache,
 184                 const unsigned char *gitmodules_sha1, const char *name)
 185 {
 186         struct submodule *submodule;
 187         struct strbuf name_buf = STRBUF_INIT;
 188
 189         submodule = cache_lookup_name(cache, gitmodules_sha1, name);
 190         if (submodule)
 191                 return submodule;
 192
 193         submodule = xmalloc(sizeof(*submodule));
 194
 195         strbuf_addstr(&name_buf, name);
 196         submodule->name = strbuf_detach(&name_buf, NULL);
 197
 198         submodule->path = NULL;
 199         submodule->url = NULL;
 200         submodule->update_strategy.type = SM_UPDATE_UNSPECIFIED;
 201         submodule->update_strategy.command = NULL;
 202         submodule->fetch_recurse = RECURSE_SUBMODULES_NONE;
 203         submodule->ignore = NULL;
 204         submodule->branch = NULL;
 205         submodule->recommend_shallow = -1;
 206
 207         hashcpy(submodule->gitmodules_sha1, gitmodules_sha1);
 208
 209         cache_add(cache, submodule);
 210
 211         return submodule;
 212 }
 213
 214 static int parse_fetch_recurse(const char *opt, const char *arg,
 215                                int die_on_error)
 216 {
 217         switch (git_config_maybe_bool(opt, arg)) {
 218         case 1:
 219                 return RECURSE_SUBMODULES_ON;
 220         case 0:
 221                 return RECURSE_SUBMODULES_OFF;
 222         default:
 223                 if (!strcmp(arg, "on-demand"))
 224                         return RECURSE_SUBMODULES_ON_DEMAND;
 225
 226                 if (die_on_error)
 227                         die("bad %s argument: %s", opt, arg);
 228                 else
 229                         return RECURSE_SUBMODULES_ERROR;
 230         }
 231 }
 232
 233 int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
 234 {
 235         return parse_fetch_recurse(opt, arg, 1);
 236 }
 237
 238 static int parse_update_recurse(const char *opt, const char *arg,
 239                                 int die_on_error)
 240 {
 241         switch (git_config_maybe_bool(opt, arg)) {
 242         case 1:
 243                 return RECURSE_SUBMODULES_ON;
 244         case 0:
 245                 return RECURSE_SUBMODULES_OFF;
 246         default:
 247                 if (die_on_error)
 248                         die("bad %s argument: %s", opt, arg);
 249                 return RECURSE_SUBMODULES_ERROR;
 250         }
 251 }
 252
 253 int parse_update_recurse_submodules_arg(const char *opt, const char *arg)
 254 {
 255         return parse_update_recurse(opt, arg, 1);
 256 }
 257
 258 static int parse_push_recurse(const char *opt, const char *arg,
 259                                int die_on_error)
 260 {
 261         switch (git_config_maybe_bool(opt, arg)) {
 262         case 1:
 263                 /* There's no simple "on" value when pushing */
 264                 if (die_on_error)
 265                         die("bad %s argument: %s", opt, arg);
 266                 else
 267                         return RECURSE_SUBMODULES_ERROR;
 268         case 0:
 269                 return RECURSE_SUBMODULES_OFF;
 270         default:
 271                 if (!strcmp(arg, "on-demand"))
 272                         return RECURSE_SUBMODULES_ON_DEMAND;
 273                 else if (!strcmp(arg, "check"))
 274                         return RECURSE_SUBMODULES_CHECK;
 275                 else if (!strcmp(arg, "only"))
 276                         return RECURSE_SUBMODULES_ONLY;
 277                 else if (die_on_error)
 278                         die("bad %s argument: %s", opt, arg);
 279                 else
 280                         return RECURSE_SUBMODULES_ERROR;
 281         }
 282 }
 283
 284 int parse_push_recurse_submodules_arg(const char *opt, const char *arg)
 285 {
 286         return parse_push_recurse(opt, arg, 1);
 287 }
 288
 289 static void warn_multiple_config(const unsigned char *treeish_name,
 290                                  const char *name, const char *option)
 291 {
 292         const char *commit_string = "WORKTREE";
 293         if (treeish_name)
 294                 commit_string = sha1_to_hex(treeish_name);
 295         warning("%s:.gitmodules, multiple configurations found for "
 296                         "'submodule.%s.%s'. Skipping second one!",
 297                         commit_string, name, option);
 298 }
 299
 300 struct parse_config_parameter {
 301         struct submodule_cache *cache;
 302         const unsigned char *treeish_name;
 303         const unsigned char *gitmodules_sha1;
 304         int overwrite;
 305 };
 306
 307 static int parse_config(const char *var, const char *value, void *data)
 308 {
 309         struct parse_config_parameter *me = data;
 310         struct submodule *submodule;
 311         struct strbuf name = STRBUF_INIT, item = STRBUF_INIT;
 312         int ret = 0;
 313
 314         /* this also ensures that we only parse submodule entries */
 315         if (!name_and_item_from_var(var, &name, &item))
 316                 return 0;
 317
 318         submodule = lookup_or_create_by_name(me->cache,
 319                                              me->gitmodules_sha1,
 320                                              name.buf);
 321
 322         if (!strcmp(item.buf, "path")) {
 323                 if (!value)
 324                         ret = config_error_nonbool(var);
 325                 else if (!me->overwrite && submodule->path)
 326                         warn_multiple_config(me->treeish_name, submodule->name,
 327                                         "path");
 328                 else {
 329                         if (submodule->path)
 330                                 cache_remove_path(me->cache, submodule);
 331                         free((void *) submodule->path);
 332                         submodule->path = xstrdup(value);
 333                         cache_put_path(me->cache, submodule);
 334                 }
 335         } else if (!strcmp(item.buf, "fetchrecursesubmodules")) {
 336                 /* when parsing worktree configurations we can die early */
 337                 int die_on_error = is_null_sha1(me->gitmodules_sha1);
 338                 if (!me->overwrite &&
 339                     submodule->fetch_recurse != RECURSE_SUBMODULES_NONE)
 340                         warn_multiple_config(me->treeish_name, submodule->name,
 341                                         "fetchrecursesubmodules");
 342                 else
 343                         submodule->fetch_recurse = parse_fetch_recurse(
 344                                                                 var, value,
 345                                                                 die_on_error);
 346         } else if (!strcmp(item.buf, "ignore")) {
 347                 if (!value)
 348                         ret = config_error_nonbool(var);
 349                 else if (!me->overwrite && submodule->ignore)
 350                         warn_multiple_config(me->treeish_name, submodule->name,
 351                                         "ignore");
 352                 else if (strcmp(value, "untracked") &&
 353                          strcmp(value, "dirty") &&
 354                          strcmp(value, "all") &&
 355                          strcmp(value, "none"))
 356                         warning("Invalid parameter '%s' for config option "
 357                                         "'submodule.%s.ignore'", value, name.buf);
 358                 else {
 359                         free((void *) submodule->ignore);
 360                         submodule->ignore = xstrdup(value);
 361                 }
 362         } else if (!strcmp(item.buf, "url")) {
 363                 if (!value) {
 364                         ret = config_error_nonbool(var);
 365                 } else if (!me->overwrite && submodule->url) {
 366                         warn_multiple_config(me->treeish_name, submodule->name,
 367                                         "url");
 368                 } else {
 369                         free((void *) submodule->url);
 370                         submodule->url = xstrdup(value);
 371                 }
 372         } else if (!strcmp(item.buf, "update")) {
 373                 if (!value)
 374                         ret = config_error_nonbool(var);
 375                 else if (!me->overwrite &&
 376                          submodule->update_strategy.type != SM_UPDATE_UNSPECIFIED)
 377                         warn_multiple_config(me->treeish_name, submodule->name,
 378                                              "update");
 379                 else if (parse_submodule_update_strategy(value,
 380                          &submodule->update_strategy) < 0)
 381                                 die(_("invalid value for %s"), var);
 382         } else if (!strcmp(item.buf, "shallow")) {
 383                 if (!me->overwrite && submodule->recommend_shallow != -1)
 384                         warn_multiple_config(me->treeish_name, submodule->name,
 385                                              "shallow");
 386                 else
 387                         submodule->recommend_shallow =
 388                                 git_config_bool(var, value);
 389         } else if (!strcmp(item.buf, "branch")) {
 390                 if (!me->overwrite && submodule->branch)
 391                         warn_multiple_config(me->treeish_name, submodule->name,
 392                                              "branch");
 393                 else {
 394                         free((void *)submodule->branch);
 395                         submodule->branch = xstrdup(value);
 396                 }
 397         }
 398
 399         strbuf_release(&name);
 400         strbuf_release(&item);
 401
 402         return ret;
 403 }
 404
 405 int gitmodule_sha1_from_commit(const unsigned char *treeish_name,
 406                                       unsigned char *gitmodules_sha1,
 407                                       struct strbuf *rev)
 408 {
 409         int ret = 0;
 410
 411         if (is_null_sha1(treeish_name)) {
 412                 hashclr(gitmodules_sha1);
 413                 return 1;
 414         }
 415
 416         strbuf_addf(rev, "%s:.gitmodules", sha1_to_hex(treeish_name));
 417         if (get_sha1(rev->buf, gitmodules_sha1) >= 0)
 418                 ret = 1;
 419
 420         return ret;
 421 }
 422
 423 /* This does a lookup of a submodule configuration by name or by path
 424  * (key) with on-demand reading of the appropriate .gitmodules from
 425  * revisions.
 426  */
 427 static const struct submodule *config_from(struct submodule_cache *cache,
 428                 const unsigned char *treeish_name, const char *key,
 429                 enum lookup_type lookup_type)
 430 {
 431         struct strbuf rev = STRBUF_INIT;
 432         unsigned long config_size;
 433         char *config = NULL;
 434         unsigned char sha1[20];
 435         enum object_type type;
 436         const struct submodule *submodule = NULL;
 437         struct parse_config_parameter parameter;
 438
 439         /*
 440          * If any parameter except the cache is a NULL pointer just
 441          * return the first submodule. Can be used to check whether
 442          * there are any submodules parsed.
 443          */
 444         if (!treeish_name || !key) {
 445                 struct hashmap_iter iter;
 446                 struct submodule_entry *entry;
 447
 448                 entry = hashmap_iter_first(&cache->for_name, &iter);
 449                 if (!entry)
 450                         return NULL;
 451                 return entry->config;
 452         }
 453
 454         if (!gitmodule_sha1_from_commit(treeish_name, sha1, &rev))
 455                 goto out;
 456
 457         switch (lookup_type) {
 458         case lookup_name:
 459                 submodule = cache_lookup_name(cache, sha1, key);
 460                 break;
 461         case lookup_path:
 462                 submodule = cache_lookup_path(cache, sha1, key);
 463                 break;
 464         }
 465         if (submodule)
 466                 goto out;
 467
 468         config = read_sha1_file(sha1, &type, &config_size);
 469         if (!config || type != OBJ_BLOB)
 470                 goto out;
 471
 472         /* fill the submodule config into the cache */
 473         parameter.cache = cache;
 474         parameter.treeish_name = treeish_name;
 475         parameter.gitmodules_sha1 = sha1;
 476         parameter.overwrite = 0;
 477         git_config_from_mem(parse_config, CONFIG_ORIGIN_SUBMODULE_BLOB, rev.buf,
 478                         config, config_size, &parameter);
 479         strbuf_release(&rev);
 480         free(config);
 481
 482         switch (lookup_type) {
 483         case lookup_name:
 484                 return cache_lookup_name(cache, sha1, key);
 485         case lookup_path:
 486                 return cache_lookup_path(cache, sha1, key);
 487         default:
 488                 return NULL;
 489         }
 490
 491 out:
 492         strbuf_release(&rev);
 493         free(config);
 494         return submodule;
 495 }
 496
 497 static void ensure_cache_init(void)
 498 {
 499         if (is_cache_init)
 500                 return;
 501
 502         cache_init(&the_submodule_cache);
 503         is_cache_init = 1;
 504 }
 505
 506 int parse_submodule_config_option(const char *var, const char *value)
 507 {
 508         struct parse_config_parameter parameter;
 509         parameter.cache = &the_submodule_cache;
 510         parameter.treeish_name = NULL;
 511         parameter.gitmodules_sha1 = null_sha1;
 512         parameter.overwrite = 1;
 513
 514         ensure_cache_init();
 515         return parse_config(var, value, &parameter);
 516 }
 517
 518 const struct submodule *submodule_from_name(const unsigned char *treeish_name,
 519                 const char *name)
 520 {
 521         ensure_cache_init();
 522         return config_from(&the_submodule_cache, treeish_name, name, lookup_name);
 523 }
 524
 525 const struct submodule *submodule_from_path(const unsigned char *treeish_name,
 526                 const char *path)
 527 {
 528         ensure_cache_init();
 529         return config_from(&the_submodule_cache, treeish_name, path, lookup_path);
 530 }
 531
 532 void submodule_free(void)
 533 {
 534         cache_free(&the_submodule_cache);
 535         is_cache_init = 0;
 536 }