Andrew's git / gitweb.git / submodule-config.c
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submodule-config.con commit Merge branch 'js/import-tars-hardlinks' into maint (5e09f1d)
   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
 203        hashcpy(submodule->gitmodules_sha1, gitmodules_sha1);
 204
 205        cache_add(cache, submodule);
 206
 207        return submodule;
 208}
 209
 210static int parse_fetch_recurse(const char *opt, const char *arg,
 211                               int die_on_error)
 212{
 213        switch (git_config_maybe_bool(opt, arg)) {
 214        case 1:
 215                return RECURSE_SUBMODULES_ON;
 216        case 0:
 217                return RECURSE_SUBMODULES_OFF;
 218        default:
 219                if (!strcmp(arg, "on-demand"))
 220                        return RECURSE_SUBMODULES_ON_DEMAND;
 221
 222                if (die_on_error)
 223                        die("bad %s argument: %s", opt, arg);
 224                else
 225                        return RECURSE_SUBMODULES_ERROR;
 226        }
 227}
 228
 229int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
 230{
 231        return parse_fetch_recurse(opt, arg, 1);
 232}
 233
 234static int parse_push_recurse(const char *opt, const char *arg,
 235                               int die_on_error)
 236{
 237        switch (git_config_maybe_bool(opt, arg)) {
 238        case 1:
 239                /* There's no simple "on" value when pushing */
 240                if (die_on_error)
 241                        die("bad %s argument: %s", opt, arg);
 242                else
 243                        return RECURSE_SUBMODULES_ERROR;
 244        case 0:
 245                return RECURSE_SUBMODULES_OFF;
 246        default:
 247                if (!strcmp(arg, "on-demand"))
 248                        return RECURSE_SUBMODULES_ON_DEMAND;
 249                else if (!strcmp(arg, "check"))
 250                        return RECURSE_SUBMODULES_CHECK;
 251                else if (die_on_error)
 252                        die("bad %s argument: %s", opt, arg);
 253                else
 254                        return RECURSE_SUBMODULES_ERROR;
 255        }
 256}
 257
 258int parse_push_recurse_submodules_arg(const char *opt, const char *arg)
 259{
 260        return parse_push_recurse(opt, arg, 1);
 261}
 262
 263static void warn_multiple_config(const unsigned char *commit_sha1,
 264                                 const char *name, const char *option)
 265{
 266        const char *commit_string = "WORKTREE";
 267        if (commit_sha1)
 268                commit_string = sha1_to_hex(commit_sha1);
 269        warning("%s:.gitmodules, multiple configurations found for "
 270                        "'submodule.%s.%s'. Skipping second one!",
 271                        commit_string, name, option);
 272}
 273
 274struct parse_config_parameter {
 275        struct submodule_cache *cache;
 276        const unsigned char *commit_sha1;
 277        const unsigned char *gitmodules_sha1;
 278        int overwrite;
 279};
 280
 281static int parse_config(const char *var, const char *value, void *data)
 282{
 283        struct parse_config_parameter *me = data;
 284        struct submodule *submodule;
 285        struct strbuf name = STRBUF_INIT, item = STRBUF_INIT;
 286        int ret = 0;
 287
 288        /* this also ensures that we only parse submodule entries */
 289        if (!name_and_item_from_var(var, &name, &item))
 290                return 0;
 291
 292        submodule = lookup_or_create_by_name(me->cache,
 293                                             me->gitmodules_sha1,
 294                                             name.buf);
 295
 296        if (!strcmp(item.buf, "path")) {
 297                if (!value)
 298                        ret = config_error_nonbool(var);
 299                else if (!me->overwrite && submodule->path)
 300                        warn_multiple_config(me->commit_sha1, submodule->name,
 301                                        "path");
 302                else {
 303                        if (submodule->path)
 304                                cache_remove_path(me->cache, submodule);
 305                        free((void *) submodule->path);
 306                        submodule->path = xstrdup(value);
 307                        cache_put_path(me->cache, submodule);
 308                }
 309        } else if (!strcmp(item.buf, "fetchrecursesubmodules")) {
 310                /* when parsing worktree configurations we can die early */
 311                int die_on_error = is_null_sha1(me->gitmodules_sha1);
 312                if (!me->overwrite &&
 313                    submodule->fetch_recurse != RECURSE_SUBMODULES_NONE)
 314                        warn_multiple_config(me->commit_sha1, submodule->name,
 315                                        "fetchrecursesubmodules");
 316                else
 317                        submodule->fetch_recurse = parse_fetch_recurse(
 318                                                                var, value,
 319                                                                die_on_error);
 320        } else if (!strcmp(item.buf, "ignore")) {
 321                if (!value)
 322                        ret = config_error_nonbool(var);
 323                else if (!me->overwrite && submodule->ignore)
 324                        warn_multiple_config(me->commit_sha1, submodule->name,
 325                                        "ignore");
 326                else if (strcmp(value, "untracked") &&
 327                         strcmp(value, "dirty") &&
 328                         strcmp(value, "all") &&
 329                         strcmp(value, "none"))
 330                        warning("Invalid parameter '%s' for config option "
 331                                        "'submodule.%s.ignore'", value, var);
 332                else {
 333                        free((void *) submodule->ignore);
 334                        submodule->ignore = xstrdup(value);
 335                }
 336        } else if (!strcmp(item.buf, "url")) {
 337                if (!value) {
 338                        ret = config_error_nonbool(var);
 339                } else if (!me->overwrite && submodule->url) {
 340                        warn_multiple_config(me->commit_sha1, submodule->name,
 341                                        "url");
 342                } else {
 343                        free((void *) submodule->url);
 344                        submodule->url = xstrdup(value);
 345                }
 346        } else if (!strcmp(item.buf, "update")) {
 347                if (!value)
 348                        ret = config_error_nonbool(var);
 349                else if (!me->overwrite &&
 350                         submodule->update_strategy.type != SM_UPDATE_UNSPECIFIED)
 351                        warn_multiple_config(me->commit_sha1, submodule->name,
 352                                             "update");
 353                else if (parse_submodule_update_strategy(value,
 354                         &submodule->update_strategy) < 0)
 355                                die(_("invalid value for %s"), var);
 356        }
 357
 358        strbuf_release(&name);
 359        strbuf_release(&item);
 360
 361        return ret;
 362}
 363
 364static int gitmodule_sha1_from_commit(const unsigned char *commit_sha1,
 365                                      unsigned char *gitmodules_sha1,
 366                                      struct strbuf *rev)
 367{
 368        int ret = 0;
 369
 370        if (is_null_sha1(commit_sha1)) {
 371                hashcpy(gitmodules_sha1, null_sha1);
 372                return 1;
 373        }
 374
 375        strbuf_addf(rev, "%s:.gitmodules", sha1_to_hex(commit_sha1));
 376        if (get_sha1(rev->buf, gitmodules_sha1) >= 0)
 377                ret = 1;
 378
 379        return ret;
 380}
 381
 382/* This does a lookup of a submodule configuration by name or by path
 383 * (key) with on-demand reading of the appropriate .gitmodules from
 384 * revisions.
 385 */
 386static const struct submodule *config_from(struct submodule_cache *cache,
 387                const unsigned char *commit_sha1, const char *key,
 388                enum lookup_type lookup_type)
 389{
 390        struct strbuf rev = STRBUF_INIT;
 391        unsigned long config_size;
 392        char *config = NULL;
 393        unsigned char sha1[20];
 394        enum object_type type;
 395        const struct submodule *submodule = NULL;
 396        struct parse_config_parameter parameter;
 397
 398        /*
 399         * If any parameter except the cache is a NULL pointer just
 400         * return the first submodule. Can be used to check whether
 401         * there are any submodules parsed.
 402         */
 403        if (!commit_sha1 || !key) {
 404                struct hashmap_iter iter;
 405                struct submodule_entry *entry;
 406
 407                entry = hashmap_iter_first(&cache->for_name, &iter);
 408                if (!entry)
 409                        return NULL;
 410                return entry->config;
 411        }
 412
 413        if (!gitmodule_sha1_from_commit(commit_sha1, sha1, &rev))
 414                goto out;
 415
 416        switch (lookup_type) {
 417        case lookup_name:
 418                submodule = cache_lookup_name(cache, sha1, key);
 419                break;
 420        case lookup_path:
 421                submodule = cache_lookup_path(cache, sha1, key);
 422                break;
 423        }
 424        if (submodule)
 425                goto out;
 426
 427        config = read_sha1_file(sha1, &type, &config_size);
 428        if (!config || type != OBJ_BLOB)
 429                goto out;
 430
 431        /* fill the submodule config into the cache */
 432        parameter.cache = cache;
 433        parameter.commit_sha1 = commit_sha1;
 434        parameter.gitmodules_sha1 = sha1;
 435        parameter.overwrite = 0;
 436        git_config_from_mem(parse_config, "submodule-blob", rev.buf,
 437                        config, config_size, &parameter);
 438        strbuf_release(&rev);
 439        free(config);
 440
 441        switch (lookup_type) {
 442        case lookup_name:
 443                return cache_lookup_name(cache, sha1, key);
 444        case lookup_path:
 445                return cache_lookup_path(cache, sha1, key);
 446        default:
 447                return NULL;
 448        }
 449
 450out:
 451        strbuf_release(&rev);
 452        free(config);
 453        return submodule;
 454}
 455
 456static const struct submodule *config_from_path(struct submodule_cache *cache,
 457                const unsigned char *commit_sha1, const char *path)
 458{
 459        return config_from(cache, commit_sha1, path, lookup_path);
 460}
 461
 462static const struct submodule *config_from_name(struct submodule_cache *cache,
 463                const unsigned char *commit_sha1, const char *name)
 464{
 465        return config_from(cache, commit_sha1, name, lookup_name);
 466}
 467
 468static void ensure_cache_init(void)
 469{
 470        if (is_cache_init)
 471                return;
 472
 473        cache_init(&the_submodule_cache);
 474        is_cache_init = 1;
 475}
 476
 477int parse_submodule_config_option(const char *var, const char *value)
 478{
 479        struct parse_config_parameter parameter;
 480        parameter.cache = &the_submodule_cache;
 481        parameter.commit_sha1 = NULL;
 482        parameter.gitmodules_sha1 = null_sha1;
 483        parameter.overwrite = 1;
 484
 485        ensure_cache_init();
 486        return parse_config(var, value, &parameter);
 487}
 488
 489const struct submodule *submodule_from_name(const unsigned char *commit_sha1,
 490                const char *name)
 491{
 492        ensure_cache_init();
 493        return config_from_name(&the_submodule_cache, commit_sha1, name);
 494}
 495
 496const struct submodule *submodule_from_path(const unsigned char *commit_sha1,
 497                const char *path)
 498{
 499        ensure_cache_init();
 500        return config_from_path(&the_submodule_cache, commit_sha1, path);
 501}
 502
 503void submodule_free(void)
 504{
 505        cache_free(&the_submodule_cache);
 506        is_cache_init = 0;
 507}