Andrew's git / gitweb.git / submodule-config.c
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submodule-config.con commit clone: better error when --reference is a linked checkout (d78db84)
   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 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(entry->config);
  63}
  64
  65static void cache_free(struct submodule_cache *cache)
  66{
  67        struct hashmap_iter iter;
  68        struct submodule_entry *entry;
  69
  70        /*
  71         * We iterate over the name hash here to be symmetric with the
  72         * allocation of struct submodule entries. Each is allocated by
  73         * their .gitmodule blob sha1 and submodule name.
  74         */
  75        hashmap_iter_init(&cache->for_name, &iter);
  76        while ((entry = hashmap_iter_next(&iter)))
  77                free_one_config(entry);
  78
  79        hashmap_free(&cache->for_path, 1);
  80        hashmap_free(&cache->for_name, 1);
  81}
  82
  83static unsigned int hash_sha1_string(const unsigned char *sha1,
  84                                     const char *string)
  85{
  86        return memhash(sha1, 20) + strhash(string);
  87}
  88
  89static void cache_put_path(struct submodule_cache *cache,
  90                           struct submodule *submodule)
  91{
  92        unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
  93                                             submodule->path);
  94        struct submodule_entry *e = xmalloc(sizeof(*e));
  95        hashmap_entry_init(e, hash);
  96        e->config = submodule;
  97        hashmap_put(&cache->for_path, e);
  98}
  99
 100static void cache_remove_path(struct submodule_cache *cache,
 101                              struct submodule *submodule)
 102{
 103        unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
 104                                             submodule->path);
 105        struct submodule_entry e;
 106        struct submodule_entry *removed;
 107        hashmap_entry_init(&e, hash);
 108        e.config = submodule;
 109        removed = hashmap_remove(&cache->for_path, &e, NULL);
 110        free(removed);
 111}
 112
 113static void cache_add(struct submodule_cache *cache,
 114                      struct submodule *submodule)
 115{
 116        unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
 117                                             submodule->name);
 118        struct submodule_entry *e = xmalloc(sizeof(*e));
 119        hashmap_entry_init(e, hash);
 120        e->config = submodule;
 121        hashmap_add(&cache->for_name, e);
 122}
 123
 124static const struct submodule *cache_lookup_path(struct submodule_cache *cache,
 125                const unsigned char *gitmodules_sha1, const char *path)
 126{
 127        struct submodule_entry *entry;
 128        unsigned int hash = hash_sha1_string(gitmodules_sha1, path);
 129        struct submodule_entry key;
 130        struct submodule key_config;
 131
 132        hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
 133        key_config.path = path;
 134
 135        hashmap_entry_init(&key, hash);
 136        key.config = &key_config;
 137
 138        entry = hashmap_get(&cache->for_path, &key, NULL);
 139        if (entry)
 140                return entry->config;
 141        return NULL;
 142}
 143
 144static struct submodule *cache_lookup_name(struct submodule_cache *cache,
 145                const unsigned char *gitmodules_sha1, const char *name)
 146{
 147        struct submodule_entry *entry;
 148        unsigned int hash = hash_sha1_string(gitmodules_sha1, name);
 149        struct submodule_entry key;
 150        struct submodule key_config;
 151
 152        hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
 153        key_config.name = name;
 154
 155        hashmap_entry_init(&key, hash);
 156        key.config = &key_config;
 157
 158        entry = hashmap_get(&cache->for_name, &key, NULL);
 159        if (entry)
 160                return entry->config;
 161        return NULL;
 162}
 163
 164static int name_and_item_from_var(const char *var, struct strbuf *name,
 165                                  struct strbuf *item)
 166{
 167        const char *subsection, *key;
 168        int subsection_len, parse;
 169        parse = parse_config_key(var, "submodule", &subsection,
 170                        &subsection_len, &key);
 171        if (parse < 0 || !subsection)
 172                return 0;
 173
 174        strbuf_add(name, subsection, subsection_len);
 175        strbuf_addstr(item, key);
 176
 177        return 1;
 178}
 179
 180static struct submodule *lookup_or_create_by_name(struct submodule_cache *cache,
 181                const unsigned char *gitmodules_sha1, const char *name)
 182{
 183        struct submodule *submodule;
 184        struct strbuf name_buf = STRBUF_INIT;
 185
 186        submodule = cache_lookup_name(cache, gitmodules_sha1, name);
 187        if (submodule)
 188                return submodule;
 189
 190        submodule = xmalloc(sizeof(*submodule));
 191
 192        strbuf_addstr(&name_buf, name);
 193        submodule->name = strbuf_detach(&name_buf, NULL);
 194
 195        submodule->path = NULL;
 196        submodule->url = NULL;
 197        submodule->fetch_recurse = RECURSE_SUBMODULES_NONE;
 198        submodule->ignore = NULL;
 199
 200        hashcpy(submodule->gitmodules_sha1, gitmodules_sha1);
 201
 202        cache_add(cache, submodule);
 203
 204        return submodule;
 205}
 206
 207static int parse_fetch_recurse(const char *opt, const char *arg,
 208                               int die_on_error)
 209{
 210        switch (git_config_maybe_bool(opt, arg)) {
 211        case 1:
 212                return RECURSE_SUBMODULES_ON;
 213        case 0:
 214                return RECURSE_SUBMODULES_OFF;
 215        default:
 216                if (!strcmp(arg, "on-demand"))
 217                        return RECURSE_SUBMODULES_ON_DEMAND;
 218
 219                if (die_on_error)
 220                        die("bad %s argument: %s", opt, arg);
 221                else
 222                        return RECURSE_SUBMODULES_ERROR;
 223        }
 224}
 225
 226int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
 227{
 228        return parse_fetch_recurse(opt, arg, 1);
 229}
 230
 231static void warn_multiple_config(const unsigned char *commit_sha1,
 232                                 const char *name, const char *option)
 233{
 234        const char *commit_string = "WORKTREE";
 235        if (commit_sha1)
 236                commit_string = sha1_to_hex(commit_sha1);
 237        warning("%s:.gitmodules, multiple configurations found for "
 238                        "'submodule.%s.%s'. Skipping second one!",
 239                        commit_string, name, option);
 240}
 241
 242struct parse_config_parameter {
 243        struct submodule_cache *cache;
 244        const unsigned char *commit_sha1;
 245        const unsigned char *gitmodules_sha1;
 246        int overwrite;
 247};
 248
 249static int parse_config(const char *var, const char *value, void *data)
 250{
 251        struct parse_config_parameter *me = data;
 252        struct submodule *submodule;
 253        struct strbuf name = STRBUF_INIT, item = STRBUF_INIT;
 254        int ret = 0;
 255
 256        /* this also ensures that we only parse submodule entries */
 257        if (!name_and_item_from_var(var, &name, &item))
 258                return 0;
 259
 260        submodule = lookup_or_create_by_name(me->cache, me->gitmodules_sha1,
 261                        name.buf);
 262
 263        if (!strcmp(item.buf, "path")) {
 264                struct strbuf path = STRBUF_INIT;
 265                if (!value) {
 266                        ret = config_error_nonbool(var);
 267                        goto release_return;
 268                }
 269                if (!me->overwrite && submodule->path != NULL) {
 270                        warn_multiple_config(me->commit_sha1, submodule->name,
 271                                        "path");
 272                        goto release_return;
 273                }
 274
 275                if (submodule->path)
 276                        cache_remove_path(me->cache, submodule);
 277                free((void *) submodule->path);
 278                strbuf_addstr(&path, value);
 279                submodule->path = strbuf_detach(&path, NULL);
 280                cache_put_path(me->cache, submodule);
 281        } else if (!strcmp(item.buf, "fetchrecursesubmodules")) {
 282                /* when parsing worktree configurations we can die early */
 283                int die_on_error = is_null_sha1(me->gitmodules_sha1);
 284                if (!me->overwrite &&
 285                    submodule->fetch_recurse != RECURSE_SUBMODULES_NONE) {
 286                        warn_multiple_config(me->commit_sha1, submodule->name,
 287                                        "fetchrecursesubmodules");
 288                        goto release_return;
 289                }
 290
 291                submodule->fetch_recurse = parse_fetch_recurse(var, value,
 292                                                                die_on_error);
 293        } else if (!strcmp(item.buf, "ignore")) {
 294                struct strbuf ignore = STRBUF_INIT;
 295                if (!me->overwrite && submodule->ignore != NULL) {
 296                        warn_multiple_config(me->commit_sha1, submodule->name,
 297                                        "ignore");
 298                        goto release_return;
 299                }
 300                if (!value) {
 301                        ret = config_error_nonbool(var);
 302                        goto release_return;
 303                }
 304                if (strcmp(value, "untracked") && strcmp(value, "dirty") &&
 305                    strcmp(value, "all") && strcmp(value, "none")) {
 306                        warning("Invalid parameter '%s' for config option "
 307                                        "'submodule.%s.ignore'", value, var);
 308                        goto release_return;
 309                }
 310
 311                free((void *) submodule->ignore);
 312                strbuf_addstr(&ignore, value);
 313                submodule->ignore = strbuf_detach(&ignore, NULL);
 314        } else if (!strcmp(item.buf, "url")) {
 315                struct strbuf url = STRBUF_INIT;
 316                if (!value) {
 317                        ret = config_error_nonbool(var);
 318                        goto release_return;
 319                }
 320                if (!me->overwrite && submodule->url != NULL) {
 321                        warn_multiple_config(me->commit_sha1, submodule->name,
 322                                        "url");
 323                        goto release_return;
 324                }
 325
 326                free((void *) submodule->url);
 327                strbuf_addstr(&url, value);
 328                submodule->url = strbuf_detach(&url, NULL);
 329        }
 330
 331release_return:
 332        strbuf_release(&name);
 333        strbuf_release(&item);
 334
 335        return ret;
 336}
 337
 338static int gitmodule_sha1_from_commit(const unsigned char *commit_sha1,
 339                                      unsigned char *gitmodules_sha1)
 340{
 341        struct strbuf rev = STRBUF_INIT;
 342        int ret = 0;
 343
 344        if (is_null_sha1(commit_sha1)) {
 345                hashcpy(gitmodules_sha1, null_sha1);
 346                return 1;
 347        }
 348
 349        strbuf_addf(&rev, "%s:.gitmodules", sha1_to_hex(commit_sha1));
 350        if (get_sha1(rev.buf, gitmodules_sha1) >= 0)
 351                ret = 1;
 352
 353        strbuf_release(&rev);
 354        return ret;
 355}
 356
 357/* This does a lookup of a submodule configuration by name or by path
 358 * (key) with on-demand reading of the appropriate .gitmodules from
 359 * revisions.
 360 */
 361static const struct submodule *config_from(struct submodule_cache *cache,
 362                const unsigned char *commit_sha1, const char *key,
 363                enum lookup_type lookup_type)
 364{
 365        struct strbuf rev = STRBUF_INIT;
 366        unsigned long config_size;
 367        char *config;
 368        unsigned char sha1[20];
 369        enum object_type type;
 370        const struct submodule *submodule = NULL;
 371        struct parse_config_parameter parameter;
 372
 373        /*
 374         * If any parameter except the cache is a NULL pointer just
 375         * return the first submodule. Can be used to check whether
 376         * there are any submodules parsed.
 377         */
 378        if (!commit_sha1 || !key) {
 379                struct hashmap_iter iter;
 380                struct submodule_entry *entry;
 381
 382                hashmap_iter_init(&cache->for_name, &iter);
 383                entry = hashmap_iter_next(&iter);
 384                if (!entry)
 385                        return NULL;
 386                return entry->config;
 387        }
 388
 389        if (!gitmodule_sha1_from_commit(commit_sha1, sha1))
 390                return NULL;
 391
 392        switch (lookup_type) {
 393        case lookup_name:
 394                submodule = cache_lookup_name(cache, sha1, key);
 395                break;
 396        case lookup_path:
 397                submodule = cache_lookup_path(cache, sha1, key);
 398                break;
 399        }
 400        if (submodule)
 401                return submodule;
 402
 403        config = read_sha1_file(sha1, &type, &config_size);
 404        if (!config)
 405                return NULL;
 406
 407        if (type != OBJ_BLOB) {
 408                free(config);
 409                return NULL;
 410        }
 411
 412        /* fill the submodule config into the cache */
 413        parameter.cache = cache;
 414        parameter.commit_sha1 = commit_sha1;
 415        parameter.gitmodules_sha1 = sha1;
 416        parameter.overwrite = 0;
 417        git_config_from_buf(parse_config, rev.buf, config, config_size,
 418                        &parameter);
 419        free(config);
 420
 421        switch (lookup_type) {
 422        case lookup_name:
 423                return cache_lookup_name(cache, sha1, key);
 424        case lookup_path:
 425                return cache_lookup_path(cache, sha1, key);
 426        default:
 427                return NULL;
 428        }
 429}
 430
 431static const struct submodule *config_from_path(struct submodule_cache *cache,
 432                const unsigned char *commit_sha1, const char *path)
 433{
 434        return config_from(cache, commit_sha1, path, lookup_path);
 435}
 436
 437static const struct submodule *config_from_name(struct submodule_cache *cache,
 438                const unsigned char *commit_sha1, const char *name)
 439{
 440        return config_from(cache, commit_sha1, name, lookup_name);
 441}
 442
 443static void ensure_cache_init(void)
 444{
 445        if (is_cache_init)
 446                return;
 447
 448        cache_init(&cache);
 449        is_cache_init = 1;
 450}
 451
 452int parse_submodule_config_option(const char *var, const char *value)
 453{
 454        struct parse_config_parameter parameter;
 455        parameter.cache = &cache;
 456        parameter.commit_sha1 = NULL;
 457        parameter.gitmodules_sha1 = null_sha1;
 458        parameter.overwrite = 1;
 459
 460        ensure_cache_init();
 461        return parse_config(var, value, &parameter);
 462}
 463
 464const struct submodule *submodule_from_name(const unsigned char *commit_sha1,
 465                const char *name)
 466{
 467        ensure_cache_init();
 468        return config_from_name(&cache, commit_sha1, name);
 469}
 470
 471const struct submodule *submodule_from_path(const unsigned char *commit_sha1,
 472                const char *path)
 473{
 474        ensure_cache_init();
 475        return config_from_path(&cache, commit_sha1, path);
 476}
 477
 478void submodule_free(void)
 479{
 480        cache_free(&cache);
 481        is_cache_init = 0;
 482}