Andrew's git / gitweb.git / submodule-config.c
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submodule-config.con commit pack-objects: use reachability bitmap index when generating non-stdout pack (645c432)
   1#include "cache.h"
   2#include "submodule-config.h"
   3#include "submodule.h"
   4#include "strbuf.h"
   5
   6/*
   7 * submodule cache lookup structure
   8 * There is one shared set of 'struct submodule' entries which can be
   9 * looked up by their sha1 blob id of the .gitmodule file and either
  10 * using path or name as key.
  11 * for_path stores submodule entries with path as key
  12 * for_name stores submodule entries with name as key
  13 */
  14struct submodule_cache {
  15        struct hashmap for_path;
  16        struct hashmap for_name;
  17};
  18
  19/*
  20 * thin wrapper struct needed to insert 'struct submodule' entries to
  21 * the hashmap
  22 */
  23struct submodule_entry {
  24        struct hashmap_entry ent;
  25        struct submodule *config;
  26};
  27
  28enum lookup_type {
  29        lookup_name,
  30        lookup_path
  31};
  32
  33static struct submodule_cache the_submodule_cache;
  34static int is_cache_init;
  35
  36static int config_path_cmp(const struct submodule_entry *a,
  37                           const struct submodule_entry *b,
  38                           const void *unused)
  39{
  40        return strcmp(a->config->path, b->config->path) ||
  41               hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
  42}
  43
  44static int config_name_cmp(const struct submodule_entry *a,
  45                           const struct submodule_entry *b,
  46                           const void *unused)
  47{
  48        return strcmp(a->config->name, b->config->name) ||
  49               hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
  50}
  51
  52static void cache_init(struct submodule_cache *cache)
  53{
  54        hashmap_init(&cache->for_path, (hashmap_cmp_fn) config_path_cmp, 0);
  55        hashmap_init(&cache->for_name, (hashmap_cmp_fn) config_name_cmp, 0);
  56}
  57
  58static void free_one_config(struct submodule_entry *entry)
  59{
  60        free((void *) entry->config->path);
  61        free((void *) entry->config->name);
  62        free((void *) entry->config->update_strategy.command);
  63        free(entry->config);
  64}
  65
  66static void cache_free(struct submodule_cache *cache)
  67{
  68        struct hashmap_iter iter;
  69        struct submodule_entry *entry;
  70
  71        /*
  72         * We iterate over the name hash here to be symmetric with the
  73         * allocation of struct submodule entries. Each is allocated by
  74         * their .gitmodule blob sha1 and submodule name.
  75         */
  76        hashmap_iter_init(&cache->for_name, &iter);
  77        while ((entry = hashmap_iter_next(&iter)))
  78                free_one_config(entry);
  79
  80        hashmap_free(&cache->for_path, 1);
  81        hashmap_free(&cache->for_name, 1);
  82}
  83
  84static unsigned int hash_sha1_string(const unsigned char *sha1,
  85                                     const char *string)
  86{
  87        return memhash(sha1, 20) + strhash(string);
  88}
  89
  90static void cache_put_path(struct submodule_cache *cache,
  91                           struct submodule *submodule)
  92{
  93        unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
  94                                             submodule->path);
  95        struct submodule_entry *e = xmalloc(sizeof(*e));
  96        hashmap_entry_init(e, hash);
  97        e->config = submodule;
  98        hashmap_put(&cache->for_path, e);
  99}
 100
 101static void cache_remove_path(struct submodule_cache *cache,
 102                              struct submodule *submodule)
 103{
 104        unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
 105                                             submodule->path);
 106        struct submodule_entry e;
 107        struct submodule_entry *removed;
 108        hashmap_entry_init(&e, hash);
 109        e.config = submodule;
 110        removed = hashmap_remove(&cache->for_path, &e, NULL);
 111        free(removed);
 112}
 113
 114static void cache_add(struct submodule_cache *cache,
 115                      struct submodule *submodule)
 116{
 117        unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
 118                                             submodule->name);
 119        struct submodule_entry *e = xmalloc(sizeof(*e));
 120        hashmap_entry_init(e, hash);
 121        e->config = submodule;
 122        hashmap_add(&cache->for_name, e);
 123}
 124
 125static const struct submodule *cache_lookup_path(struct submodule_cache *cache,
 126                const unsigned char *gitmodules_sha1, const char *path)
 127{
 128        struct submodule_entry *entry;
 129        unsigned int hash = hash_sha1_string(gitmodules_sha1, path);
 130        struct submodule_entry key;
 131        struct submodule key_config;
 132
 133        hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
 134        key_config.path = path;
 135
 136        hashmap_entry_init(&key, hash);
 137        key.config = &key_config;
 138
 139        entry = hashmap_get(&cache->for_path, &key, NULL);
 140        if (entry)
 141                return entry->config;
 142        return NULL;
 143}
 144
 145static struct submodule *cache_lookup_name(struct submodule_cache *cache,
 146                const unsigned char *gitmodules_sha1, const char *name)
 147{
 148        struct submodule_entry *entry;
 149        unsigned int hash = hash_sha1_string(gitmodules_sha1, name);
 150        struct submodule_entry key;
 151        struct submodule key_config;
 152
 153        hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
 154        key_config.name = name;
 155
 156        hashmap_entry_init(&key, hash);
 157        key.config = &key_config;
 158
 159        entry = hashmap_get(&cache->for_name, &key, NULL);
 160        if (entry)
 161                return entry->config;
 162        return NULL;
 163}
 164
 165static int name_and_item_from_var(const char *var, struct strbuf *name,
 166                                  struct strbuf *item)
 167{
 168        const char *subsection, *key;
 169        int subsection_len, parse;
 170        parse = parse_config_key(var, "submodule", &subsection,
 171                        &subsection_len, &key);
 172        if (parse < 0 || !subsection)
 173                return 0;
 174
 175        strbuf_add(name, subsection, subsection_len);
 176        strbuf_addstr(item, key);
 177
 178        return 1;
 179}
 180
 181static struct submodule *lookup_or_create_by_name(struct submodule_cache *cache,
 182                const unsigned char *gitmodules_sha1, const char *name)
 183{
 184        struct submodule *submodule;
 185        struct strbuf name_buf = STRBUF_INIT;
 186
 187        submodule = cache_lookup_name(cache, gitmodules_sha1, name);
 188        if (submodule)
 189                return submodule;
 190
 191        submodule = xmalloc(sizeof(*submodule));
 192
 193        strbuf_addstr(&name_buf, name);
 194        submodule->name = strbuf_detach(&name_buf, NULL);
 195
 196        submodule->path = NULL;
 197        submodule->url = NULL;
 198        submodule->update_strategy.type = SM_UPDATE_UNSPECIFIED;
 199        submodule->update_strategy.command = NULL;
 200        submodule->fetch_recurse = RECURSE_SUBMODULES_NONE;
 201        submodule->ignore = NULL;
 202        submodule->recommend_shallow = -1;
 203
 204        hashcpy(submodule->gitmodules_sha1, gitmodules_sha1);
 205
 206        cache_add(cache, submodule);
 207
 208        return submodule;
 209}
 210
 211static int parse_fetch_recurse(const char *opt, const char *arg,
 212                               int die_on_error)
 213{
 214        switch (git_config_maybe_bool(opt, arg)) {
 215        case 1:
 216                return RECURSE_SUBMODULES_ON;
 217        case 0:
 218                return RECURSE_SUBMODULES_OFF;
 219        default:
 220                if (!strcmp(arg, "on-demand"))
 221                        return RECURSE_SUBMODULES_ON_DEMAND;
 222
 223                if (die_on_error)
 224                        die("bad %s argument: %s", opt, arg);
 225                else
 226                        return RECURSE_SUBMODULES_ERROR;
 227        }
 228}
 229
 230int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
 231{
 232        return parse_fetch_recurse(opt, arg, 1);
 233}
 234
 235static int parse_push_recurse(const char *opt, const char *arg,
 236                               int die_on_error)
 237{
 238        switch (git_config_maybe_bool(opt, arg)) {
 239        case 1:
 240                /* There's no simple "on" value when pushing */
 241                if (die_on_error)
 242                        die("bad %s argument: %s", opt, arg);
 243                else
 244                        return RECURSE_SUBMODULES_ERROR;
 245        case 0:
 246                return RECURSE_SUBMODULES_OFF;
 247        default:
 248                if (!strcmp(arg, "on-demand"))
 249                        return RECURSE_SUBMODULES_ON_DEMAND;
 250                else if (!strcmp(arg, "check"))
 251                        return RECURSE_SUBMODULES_CHECK;
 252                else if (die_on_error)
 253                        die("bad %s argument: %s", opt, arg);
 254                else
 255                        return RECURSE_SUBMODULES_ERROR;
 256        }
 257}
 258
 259int parse_push_recurse_submodules_arg(const char *opt, const char *arg)
 260{
 261        return parse_push_recurse(opt, arg, 1);
 262}
 263
 264static void warn_multiple_config(const unsigned char *commit_sha1,
 265                                 const char *name, const char *option)
 266{
 267        const char *commit_string = "WORKTREE";
 268        if (commit_sha1)
 269                commit_string = sha1_to_hex(commit_sha1);
 270        warning("%s:.gitmodules, multiple configurations found for "
 271                        "'submodule.%s.%s'. Skipping second one!",
 272                        commit_string, name, option);
 273}
 274
 275struct parse_config_parameter {
 276        struct submodule_cache *cache;
 277        const unsigned char *commit_sha1;
 278        const unsigned char *gitmodules_sha1;
 279        int overwrite;
 280};
 281
 282static int parse_config(const char *var, const char *value, void *data)
 283{
 284        struct parse_config_parameter *me = data;
 285        struct submodule *submodule;
 286        struct strbuf name = STRBUF_INIT, item = STRBUF_INIT;
 287        int ret = 0;
 288
 289        /* this also ensures that we only parse submodule entries */
 290        if (!name_and_item_from_var(var, &name, &item))
 291                return 0;
 292
 293        submodule = lookup_or_create_by_name(me->cache,
 294                                             me->gitmodules_sha1,
 295                                             name.buf);
 296
 297        if (!strcmp(item.buf, "path")) {
 298                if (!value)
 299                        ret = config_error_nonbool(var);
 300                else if (!me->overwrite && submodule->path)
 301                        warn_multiple_config(me->commit_sha1, submodule->name,
 302                                        "path");
 303                else {
 304                        if (submodule->path)
 305                                cache_remove_path(me->cache, submodule);
 306                        free((void *) submodule->path);
 307                        submodule->path = xstrdup(value);
 308                        cache_put_path(me->cache, submodule);
 309                }
 310        } else if (!strcmp(item.buf, "fetchrecursesubmodules")) {
 311                /* when parsing worktree configurations we can die early */
 312                int die_on_error = is_null_sha1(me->gitmodules_sha1);
 313                if (!me->overwrite &&
 314                    submodule->fetch_recurse != RECURSE_SUBMODULES_NONE)
 315                        warn_multiple_config(me->commit_sha1, submodule->name,
 316                                        "fetchrecursesubmodules");
 317                else
 318                        submodule->fetch_recurse = parse_fetch_recurse(
 319                                                                var, value,
 320                                                                die_on_error);
 321        } else if (!strcmp(item.buf, "ignore")) {
 322                if (!value)
 323                        ret = config_error_nonbool(var);
 324                else if (!me->overwrite && submodule->ignore)
 325                        warn_multiple_config(me->commit_sha1, submodule->name,
 326                                        "ignore");
 327                else if (strcmp(value, "untracked") &&
 328                         strcmp(value, "dirty") &&
 329                         strcmp(value, "all") &&
 330                         strcmp(value, "none"))
 331                        warning("Invalid parameter '%s' for config option "
 332                                        "'submodule.%s.ignore'", value, var);
 333                else {
 334                        free((void *) submodule->ignore);
 335                        submodule->ignore = xstrdup(value);
 336                }
 337        } else if (!strcmp(item.buf, "url")) {
 338                if (!value) {
 339                        ret = config_error_nonbool(var);
 340                } else if (!me->overwrite && submodule->url) {
 341                        warn_multiple_config(me->commit_sha1, submodule->name,
 342                                        "url");
 343                } else {
 344                        free((void *) submodule->url);
 345                        submodule->url = xstrdup(value);
 346                }
 347        } else if (!strcmp(item.buf, "update")) {
 348                if (!value)
 349                        ret = config_error_nonbool(var);
 350                else if (!me->overwrite &&
 351                         submodule->update_strategy.type != SM_UPDATE_UNSPECIFIED)
 352                        warn_multiple_config(me->commit_sha1, submodule->name,
 353                                             "update");
 354                else if (parse_submodule_update_strategy(value,
 355                         &submodule->update_strategy) < 0)
 356                                die(_("invalid value for %s"), var);
 357        } else if (!strcmp(item.buf, "shallow")) {
 358                if (!me->overwrite && submodule->recommend_shallow != -1)
 359                        warn_multiple_config(me->commit_sha1, submodule->name,
 360                                             "shallow");
 361                else {
 362                        submodule->recommend_shallow =
 363                                git_config_bool(var, value);
 364                }
 365        }
 366
 367        strbuf_release(&name);
 368        strbuf_release(&item);
 369
 370        return ret;
 371}
 372
 373static int gitmodule_sha1_from_commit(const unsigned char *commit_sha1,
 374                                      unsigned char *gitmodules_sha1)
 375{
 376        struct strbuf rev = STRBUF_INIT;
 377        int ret = 0;
 378
 379        if (is_null_sha1(commit_sha1)) {
 380                hashclr(gitmodules_sha1);
 381                return 1;
 382        }
 383
 384        strbuf_addf(&rev, "%s:.gitmodules", sha1_to_hex(commit_sha1));
 385        if (get_sha1(rev.buf, gitmodules_sha1) >= 0)
 386                ret = 1;
 387
 388        strbuf_release(&rev);
 389        return ret;
 390}
 391
 392/* This does a lookup of a submodule configuration by name or by path
 393 * (key) with on-demand reading of the appropriate .gitmodules from
 394 * revisions.
 395 */
 396static const struct submodule *config_from(struct submodule_cache *cache,
 397                const unsigned char *commit_sha1, const char *key,
 398                enum lookup_type lookup_type)
 399{
 400        struct strbuf rev = STRBUF_INIT;
 401        unsigned long config_size;
 402        char *config;
 403        unsigned char sha1[20];
 404        enum object_type type;
 405        const struct submodule *submodule = NULL;
 406        struct parse_config_parameter parameter;
 407
 408        /*
 409         * If any parameter except the cache is a NULL pointer just
 410         * return the first submodule. Can be used to check whether
 411         * there are any submodules parsed.
 412         */
 413        if (!commit_sha1 || !key) {
 414                struct hashmap_iter iter;
 415                struct submodule_entry *entry;
 416
 417                entry = hashmap_iter_first(&cache->for_name, &iter);
 418                if (!entry)
 419                        return NULL;
 420                return entry->config;
 421        }
 422
 423        if (!gitmodule_sha1_from_commit(commit_sha1, sha1))
 424                return NULL;
 425
 426        switch (lookup_type) {
 427        case lookup_name:
 428                submodule = cache_lookup_name(cache, sha1, key);
 429                break;
 430        case lookup_path:
 431                submodule = cache_lookup_path(cache, sha1, key);
 432                break;
 433        }
 434        if (submodule)
 435                return submodule;
 436
 437        config = read_sha1_file(sha1, &type, &config_size);
 438        if (!config)
 439                return NULL;
 440
 441        if (type != OBJ_BLOB) {
 442                free(config);
 443                return NULL;
 444        }
 445
 446        /* fill the submodule config into the cache */
 447        parameter.cache = cache;
 448        parameter.commit_sha1 = commit_sha1;
 449        parameter.gitmodules_sha1 = sha1;
 450        parameter.overwrite = 0;
 451        git_config_from_mem(parse_config, "submodule-blob", rev.buf,
 452                        config, config_size, &parameter);
 453        free(config);
 454
 455        switch (lookup_type) {
 456        case lookup_name:
 457                return cache_lookup_name(cache, sha1, key);
 458        case lookup_path:
 459                return cache_lookup_path(cache, sha1, key);
 460        default:
 461                return NULL;
 462        }
 463}
 464
 465static const struct submodule *config_from_path(struct submodule_cache *cache,
 466                const unsigned char *commit_sha1, const char *path)
 467{
 468        return config_from(cache, commit_sha1, path, lookup_path);
 469}
 470
 471static const struct submodule *config_from_name(struct submodule_cache *cache,
 472                const unsigned char *commit_sha1, const char *name)
 473{
 474        return config_from(cache, commit_sha1, name, lookup_name);
 475}
 476
 477static void ensure_cache_init(void)
 478{
 479        if (is_cache_init)
 480                return;
 481
 482        cache_init(&the_submodule_cache);
 483        is_cache_init = 1;
 484}
 485
 486int parse_submodule_config_option(const char *var, const char *value)
 487{
 488        struct parse_config_parameter parameter;
 489        parameter.cache = &the_submodule_cache;
 490        parameter.commit_sha1 = NULL;
 491        parameter.gitmodules_sha1 = null_sha1;
 492        parameter.overwrite = 1;
 493
 494        ensure_cache_init();
 495        return parse_config(var, value, &parameter);
 496}
 497
 498const struct submodule *submodule_from_name(const unsigned char *commit_sha1,
 499                const char *name)
 500{
 501        ensure_cache_init();
 502        return config_from_name(&the_submodule_cache, commit_sha1, name);
 503}
 504
 505const struct submodule *submodule_from_path(const unsigned char *commit_sha1,
 506                const char *path)
 507{
 508        ensure_cache_init();
 509        return config_from_path(&the_submodule_cache, commit_sha1, path);
 510}
 511
 512void submodule_free(void)
 513{
 514        cache_free(&the_submodule_cache);
 515        is_cache_init = 0;
 516}