Andrew's git / gitweb.git / submodule-config.c
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submodule-config.con commit am: fix signoff when other trailers are present (735285b)
   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->branch);
  63        free((void *) entry->config->update_strategy.command);
  64        free(entry->config);
  65}
  66
  67static void cache_free(struct submodule_cache *cache)
  68{
  69        struct hashmap_iter iter;
  70        struct submodule_entry *entry;
  71
  72        /*
  73         * We iterate over the name hash here to be symmetric with the
  74         * allocation of struct submodule entries. Each is allocated by
  75         * their .gitmodule blob sha1 and submodule name.
  76         */
  77        hashmap_iter_init(&cache->for_name, &iter);
  78        while ((entry = hashmap_iter_next(&iter)))
  79                free_one_config(entry);
  80
  81        hashmap_free(&cache->for_path, 1);
  82        hashmap_free(&cache->for_name, 1);
  83}
  84
  85static unsigned int hash_sha1_string(const unsigned char *sha1,
  86                                     const char *string)
  87{
  88        return memhash(sha1, 20) + strhash(string);
  89}
  90
  91static void cache_put_path(struct submodule_cache *cache,
  92                           struct submodule *submodule)
  93{
  94        unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
  95                                             submodule->path);
  96        struct submodule_entry *e = xmalloc(sizeof(*e));
  97        hashmap_entry_init(e, hash);
  98        e->config = submodule;
  99        hashmap_put(&cache->for_path, e);
 100}
 101
 102static void cache_remove_path(struct submodule_cache *cache,
 103                              struct submodule *submodule)
 104{
 105        unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
 106                                             submodule->path);
 107        struct submodule_entry e;
 108        struct submodule_entry *removed;
 109        hashmap_entry_init(&e, hash);
 110        e.config = submodule;
 111        removed = hashmap_remove(&cache->for_path, &e, NULL);
 112        free(removed);
 113}
 114
 115static void cache_add(struct submodule_cache *cache,
 116                      struct submodule *submodule)
 117{
 118        unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
 119                                             submodule->name);
 120        struct submodule_entry *e = xmalloc(sizeof(*e));
 121        hashmap_entry_init(e, hash);
 122        e->config = submodule;
 123        hashmap_add(&cache->for_name, e);
 124}
 125
 126static const struct submodule *cache_lookup_path(struct submodule_cache *cache,
 127                const unsigned char *gitmodules_sha1, const char *path)
 128{
 129        struct submodule_entry *entry;
 130        unsigned int hash = hash_sha1_string(gitmodules_sha1, path);
 131        struct submodule_entry key;
 132        struct submodule key_config;
 133
 134        hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
 135        key_config.path = path;
 136
 137        hashmap_entry_init(&key, hash);
 138        key.config = &key_config;
 139
 140        entry = hashmap_get(&cache->for_path, &key, NULL);
 141        if (entry)
 142                return entry->config;
 143        return NULL;
 144}
 145
 146static struct submodule *cache_lookup_name(struct submodule_cache *cache,
 147                const unsigned char *gitmodules_sha1, const char *name)
 148{
 149        struct submodule_entry *entry;
 150        unsigned int hash = hash_sha1_string(gitmodules_sha1, name);
 151        struct submodule_entry key;
 152        struct submodule key_config;
 153
 154        hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
 155        key_config.name = name;
 156
 157        hashmap_entry_init(&key, hash);
 158        key.config = &key_config;
 159
 160        entry = hashmap_get(&cache->for_name, &key, NULL);
 161        if (entry)
 162                return entry->config;
 163        return NULL;
 164}
 165
 166static int name_and_item_from_var(const char *var, struct strbuf *name,
 167                                  struct strbuf *item)
 168{
 169        const char *subsection, *key;
 170        int subsection_len, parse;
 171        parse = parse_config_key(var, "submodule", &subsection,
 172                        &subsection_len, &key);
 173        if (parse < 0 || !subsection)
 174                return 0;
 175
 176        strbuf_add(name, subsection, subsection_len);
 177        strbuf_addstr(item, key);
 178
 179        return 1;
 180}
 181
 182static struct submodule *lookup_or_create_by_name(struct submodule_cache *cache,
 183                const unsigned char *gitmodules_sha1, const char *name)
 184{
 185        struct submodule *submodule;
 186        struct strbuf name_buf = STRBUF_INIT;
 187
 188        submodule = cache_lookup_name(cache, gitmodules_sha1, name);
 189        if (submodule)
 190                return submodule;
 191
 192        submodule = xmalloc(sizeof(*submodule));
 193
 194        strbuf_addstr(&name_buf, name);
 195        submodule->name = strbuf_detach(&name_buf, NULL);
 196
 197        submodule->path = NULL;
 198        submodule->url = NULL;
 199        submodule->update_strategy.type = SM_UPDATE_UNSPECIFIED;
 200        submodule->update_strategy.command = NULL;
 201        submodule->fetch_recurse = RECURSE_SUBMODULES_NONE;
 202        submodule->ignore = NULL;
 203        submodule->branch = NULL;
 204        submodule->recommend_shallow = -1;
 205
 206        hashcpy(submodule->gitmodules_sha1, gitmodules_sha1);
 207
 208        cache_add(cache, submodule);
 209
 210        return submodule;
 211}
 212
 213static int parse_fetch_recurse(const char *opt, const char *arg,
 214                               int die_on_error)
 215{
 216        switch (git_config_maybe_bool(opt, arg)) {
 217        case 1:
 218                return RECURSE_SUBMODULES_ON;
 219        case 0:
 220                return RECURSE_SUBMODULES_OFF;
 221        default:
 222                if (!strcmp(arg, "on-demand"))
 223                        return RECURSE_SUBMODULES_ON_DEMAND;
 224
 225                if (die_on_error)
 226                        die("bad %s argument: %s", opt, arg);
 227                else
 228                        return RECURSE_SUBMODULES_ERROR;
 229        }
 230}
 231
 232int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
 233{
 234        return parse_fetch_recurse(opt, arg, 1);
 235}
 236
 237static int parse_update_recurse(const char *opt, const char *arg,
 238                                int die_on_error)
 239{
 240        switch (git_config_maybe_bool(opt, arg)) {
 241        case 1:
 242                return RECURSE_SUBMODULES_ON;
 243        case 0:
 244                return RECURSE_SUBMODULES_OFF;
 245        default:
 246                if (die_on_error)
 247                        die("bad %s argument: %s", opt, arg);
 248                return RECURSE_SUBMODULES_ERROR;
 249        }
 250}
 251
 252int parse_update_recurse_submodules_arg(const char *opt, const char *arg)
 253{
 254        return parse_update_recurse(opt, arg, 1);
 255}
 256
 257static int parse_push_recurse(const char *opt, const char *arg,
 258                               int die_on_error)
 259{
 260        switch (git_config_maybe_bool(opt, arg)) {
 261        case 1:
 262                /* There's no simple "on" value when pushing */
 263                if (die_on_error)
 264                        die("bad %s argument: %s", opt, arg);
 265                else
 266                        return RECURSE_SUBMODULES_ERROR;
 267        case 0:
 268                return RECURSE_SUBMODULES_OFF;
 269        default:
 270                if (!strcmp(arg, "on-demand"))
 271                        return RECURSE_SUBMODULES_ON_DEMAND;
 272                else if (!strcmp(arg, "check"))
 273                        return RECURSE_SUBMODULES_CHECK;
 274                else if (!strcmp(arg, "only"))
 275                        return RECURSE_SUBMODULES_ONLY;
 276                else if (die_on_error)
 277                        die("bad %s argument: %s", opt, arg);
 278                else
 279                        return RECURSE_SUBMODULES_ERROR;
 280        }
 281}
 282
 283int parse_push_recurse_submodules_arg(const char *opt, const char *arg)
 284{
 285        return parse_push_recurse(opt, arg, 1);
 286}
 287
 288static void warn_multiple_config(const unsigned char *treeish_name,
 289                                 const char *name, const char *option)
 290{
 291        const char *commit_string = "WORKTREE";
 292        if (treeish_name)
 293                commit_string = sha1_to_hex(treeish_name);
 294        warning("%s:.gitmodules, multiple configurations found for "
 295                        "'submodule.%s.%s'. Skipping second one!",
 296                        commit_string, name, option);
 297}
 298
 299struct parse_config_parameter {
 300        struct submodule_cache *cache;
 301        const unsigned char *treeish_name;
 302        const unsigned char *gitmodules_sha1;
 303        int overwrite;
 304};
 305
 306static int parse_config(const char *var, const char *value, void *data)
 307{
 308        struct parse_config_parameter *me = data;
 309        struct submodule *submodule;
 310        struct strbuf name = STRBUF_INIT, item = STRBUF_INIT;
 311        int ret = 0;
 312
 313        /* this also ensures that we only parse submodule entries */
 314        if (!name_and_item_from_var(var, &name, &item))
 315                return 0;
 316
 317        submodule = lookup_or_create_by_name(me->cache,
 318                                             me->gitmodules_sha1,
 319                                             name.buf);
 320
 321        if (!strcmp(item.buf, "path")) {
 322                if (!value)
 323                        ret = config_error_nonbool(var);
 324                else if (!me->overwrite && submodule->path)
 325                        warn_multiple_config(me->treeish_name, submodule->name,
 326                                        "path");
 327                else {
 328                        if (submodule->path)
 329                                cache_remove_path(me->cache, submodule);
 330                        free((void *) submodule->path);
 331                        submodule->path = xstrdup(value);
 332                        cache_put_path(me->cache, submodule);
 333                }
 334        } else if (!strcmp(item.buf, "fetchrecursesubmodules")) {
 335                /* when parsing worktree configurations we can die early */
 336                int die_on_error = is_null_sha1(me->gitmodules_sha1);
 337                if (!me->overwrite &&
 338                    submodule->fetch_recurse != RECURSE_SUBMODULES_NONE)
 339                        warn_multiple_config(me->treeish_name, submodule->name,
 340                                        "fetchrecursesubmodules");
 341                else
 342                        submodule->fetch_recurse = parse_fetch_recurse(
 343                                                                var, value,
 344                                                                die_on_error);
 345        } else if (!strcmp(item.buf, "ignore")) {
 346                if (!value)
 347                        ret = config_error_nonbool(var);
 348                else if (!me->overwrite && submodule->ignore)
 349                        warn_multiple_config(me->treeish_name, submodule->name,
 350                                        "ignore");
 351                else if (strcmp(value, "untracked") &&
 352                         strcmp(value, "dirty") &&
 353                         strcmp(value, "all") &&
 354                         strcmp(value, "none"))
 355                        warning("Invalid parameter '%s' for config option "
 356                                        "'submodule.%s.ignore'", value, name.buf);
 357                else {
 358                        free((void *) submodule->ignore);
 359                        submodule->ignore = xstrdup(value);
 360                }
 361        } else if (!strcmp(item.buf, "url")) {
 362                if (!value) {
 363                        ret = config_error_nonbool(var);
 364                } else if (!me->overwrite && submodule->url) {
 365                        warn_multiple_config(me->treeish_name, submodule->name,
 366                                        "url");
 367                } else {
 368                        free((void *) submodule->url);
 369                        submodule->url = xstrdup(value);
 370                }
 371        } else if (!strcmp(item.buf, "update")) {
 372                if (!value)
 373                        ret = config_error_nonbool(var);
 374                else if (!me->overwrite &&
 375                         submodule->update_strategy.type != SM_UPDATE_UNSPECIFIED)
 376                        warn_multiple_config(me->treeish_name, submodule->name,
 377                                             "update");
 378                else if (parse_submodule_update_strategy(value,
 379                         &submodule->update_strategy) < 0)
 380                                die(_("invalid value for %s"), var);
 381        } else if (!strcmp(item.buf, "shallow")) {
 382                if (!me->overwrite && submodule->recommend_shallow != -1)
 383                        warn_multiple_config(me->treeish_name, submodule->name,
 384                                             "shallow");
 385                else
 386                        submodule->recommend_shallow =
 387                                git_config_bool(var, value);
 388        } else if (!strcmp(item.buf, "branch")) {
 389                if (!me->overwrite && submodule->branch)
 390                        warn_multiple_config(me->treeish_name, submodule->name,
 391                                             "branch");
 392                else {
 393                        free((void *)submodule->branch);
 394                        submodule->branch = xstrdup(value);
 395                }
 396        }
 397
 398        strbuf_release(&name);
 399        strbuf_release(&item);
 400
 401        return ret;
 402}
 403
 404int gitmodule_sha1_from_commit(const unsigned char *treeish_name,
 405                                      unsigned char *gitmodules_sha1,
 406                                      struct strbuf *rev)
 407{
 408        int ret = 0;
 409
 410        if (is_null_sha1(treeish_name)) {
 411                hashclr(gitmodules_sha1);
 412                return 1;
 413        }
 414
 415        strbuf_addf(rev, "%s:.gitmodules", sha1_to_hex(treeish_name));
 416        if (get_sha1(rev->buf, gitmodules_sha1) >= 0)
 417                ret = 1;
 418
 419        return ret;
 420}
 421
 422/* This does a lookup of a submodule configuration by name or by path
 423 * (key) with on-demand reading of the appropriate .gitmodules from
 424 * revisions.
 425 */
 426static const struct submodule *config_from(struct submodule_cache *cache,
 427                const unsigned char *treeish_name, const char *key,
 428                enum lookup_type lookup_type)
 429{
 430        struct strbuf rev = STRBUF_INIT;
 431        unsigned long config_size;
 432        char *config = NULL;
 433        unsigned char sha1[20];
 434        enum object_type type;
 435        const struct submodule *submodule = NULL;
 436        struct parse_config_parameter parameter;
 437
 438        /*
 439         * If any parameter except the cache is a NULL pointer just
 440         * return the first submodule. Can be used to check whether
 441         * there are any submodules parsed.
 442         */
 443        if (!treeish_name || !key) {
 444                struct hashmap_iter iter;
 445                struct submodule_entry *entry;
 446
 447                entry = hashmap_iter_first(&cache->for_name, &iter);
 448                if (!entry)
 449                        return NULL;
 450                return entry->config;
 451        }
 452
 453        if (!gitmodule_sha1_from_commit(treeish_name, sha1, &rev))
 454                goto out;
 455
 456        switch (lookup_type) {
 457        case lookup_name:
 458                submodule = cache_lookup_name(cache, sha1, key);
 459                break;
 460        case lookup_path:
 461                submodule = cache_lookup_path(cache, sha1, key);
 462                break;
 463        }
 464        if (submodule)
 465                goto out;
 466
 467        config = read_sha1_file(sha1, &type, &config_size);
 468        if (!config || type != OBJ_BLOB)
 469                goto out;
 470
 471        /* fill the submodule config into the cache */
 472        parameter.cache = cache;
 473        parameter.treeish_name = treeish_name;
 474        parameter.gitmodules_sha1 = sha1;
 475        parameter.overwrite = 0;
 476        git_config_from_mem(parse_config, CONFIG_ORIGIN_SUBMODULE_BLOB, rev.buf,
 477                        config, config_size, &parameter);
 478        strbuf_release(&rev);
 479        free(config);
 480
 481        switch (lookup_type) {
 482        case lookup_name:
 483                return cache_lookup_name(cache, sha1, key);
 484        case lookup_path:
 485                return cache_lookup_path(cache, sha1, key);
 486        default:
 487                return NULL;
 488        }
 489
 490out:
 491        strbuf_release(&rev);
 492        free(config);
 493        return submodule;
 494}
 495
 496static void ensure_cache_init(void)
 497{
 498        if (is_cache_init)
 499                return;
 500
 501        cache_init(&the_submodule_cache);
 502        is_cache_init = 1;
 503}
 504
 505int parse_submodule_config_option(const char *var, const char *value)
 506{
 507        struct parse_config_parameter parameter;
 508        parameter.cache = &the_submodule_cache;
 509        parameter.treeish_name = NULL;
 510        parameter.gitmodules_sha1 = null_sha1;
 511        parameter.overwrite = 1;
 512
 513        ensure_cache_init();
 514        return parse_config(var, value, &parameter);
 515}
 516
 517const struct submodule *submodule_from_name(const unsigned char *treeish_name,
 518                const char *name)
 519{
 520        ensure_cache_init();
 521        return config_from(&the_submodule_cache, treeish_name, name, lookup_name);
 522}
 523
 524const struct submodule *submodule_from_path(const unsigned char *treeish_name,
 525                const char *path)
 526{
 527        ensure_cache_init();
 528        return config_from(&the_submodule_cache, treeish_name, path, lookup_path);
 529}
 530
 531void submodule_free(void)
 532{
 533        cache_free(&the_submodule_cache);
 534        is_cache_init = 0;
 535}