git.oblomov.eu Git - git/blob - submodule.c

   1 #define NO_THE_INDEX_COMPATIBILITY_MACROS
   2
   3 #include "cache.h"
   4 #include "repository.h"
   5 #include "config.h"
   6 #include "submodule-config.h"
   7 #include "submodule.h"
   8 #include "dir.h"
   9 #include "diff.h"
  10 #include "commit.h"
  11 #include "revision.h"
  12 #include "run-command.h"
  13 #include "diffcore.h"
  14 #include "refs.h"
  15 #include "string-list.h"
  16 #include "sha1-array.h"
  17 #include "argv-array.h"
  18 #include "blob.h"
  19 #include "thread-utils.h"
  20 #include "quote.h"
  21 #include "remote.h"
  22 #include "worktree.h"
  23 #include "parse-options.h"
  24 #include "object-store.h"
  25 #include "commit-reach.h"
  26
  27 static int config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
  28 static struct string_list changed_submodule_names = STRING_LIST_INIT_DUP;
  29 static int initialized_fetch_ref_tips;
  30 static struct oid_array ref_tips_before_fetch;
  31 static struct oid_array ref_tips_after_fetch;
  32
  33 /*
  34  * Check if the .gitmodules file is unmerged. Parsing of the .gitmodules file
  35  * will be disabled because we can't guess what might be configured in
  36  * .gitmodules unless the user resolves the conflict.
  37  */
  38 int is_gitmodules_unmerged(const struct index_state *istate)
  39 {
  40         int pos = index_name_pos(istate, GITMODULES_FILE, strlen(GITMODULES_FILE));
  41         if (pos < 0) { /* .gitmodules not found or isn't merged */
  42                 pos = -1 - pos;
  43                 if (istate->cache_nr > pos) {  /* there is a .gitmodules */
  44                         const struct cache_entry *ce = istate->cache[pos];
  45                         if (ce_namelen(ce) == strlen(GITMODULES_FILE) &&
  46                             !strcmp(ce->name, GITMODULES_FILE))
  47                                 return 1;
  48                 }
  49         }
  50
  51         return 0;
  52 }
  53
  54 /*
  55  * Check if the .gitmodules file has unstaged modifications.  This must be
  56  * checked before allowing modifications to the .gitmodules file with the
  57  * intention to stage them later, because when continuing we would stage the
  58  * modifications the user didn't stage herself too. That might change in a
  59  * future version when we learn to stage the changes we do ourselves without
  60  * staging any previous modifications.
  61  */
  62 int is_staging_gitmodules_ok(struct index_state *istate)
  63 {
  64         int pos = index_name_pos(istate, GITMODULES_FILE, strlen(GITMODULES_FILE));
  65
  66         if ((pos >= 0) && (pos < istate->cache_nr)) {
  67                 struct stat st;
  68                 if (lstat(GITMODULES_FILE, &st) == 0 &&
  69                     ie_match_stat(istate, istate->cache[pos], &st, 0) & DATA_CHANGED)
  70                         return 0;
  71         }
  72
  73         return 1;
  74 }
  75
  76 static int for_each_remote_ref_submodule(const char *submodule,
  77                                          each_ref_fn fn, void *cb_data)
  78 {
  79         return refs_for_each_remote_ref(get_submodule_ref_store(submodule),
  80                                         fn, cb_data);
  81 }
  82
  83 /*
  84  * Try to update the "path" entry in the "submodule.<name>" section of the
  85  * .gitmodules file. Return 0 only if a .gitmodules file was found, a section
  86  * with the correct path=<oldpath> setting was found and we could update it.
  87  */
  88 int update_path_in_gitmodules(const char *oldpath, const char *newpath)
  89 {
  90         struct strbuf entry = STRBUF_INIT;
  91         const struct submodule *submodule;
  92
  93         if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
  94                 return -1;
  95
  96         if (is_gitmodules_unmerged(the_repository->index))
  97                 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
  98
  99         submodule = submodule_from_path(the_repository, &null_oid, oldpath);
 100         if (!submodule || !submodule->name) {
 101                 warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
 102                 return -1;
 103         }
 104         strbuf_addstr(&entry, "submodule.");
 105         strbuf_addstr(&entry, submodule->name);
 106         strbuf_addstr(&entry, ".path");
 107         if (git_config_set_in_file_gently(GITMODULES_FILE, entry.buf, newpath) < 0) {
 108                 /* Maybe the user already did that, don't error out here */
 109                 warning(_("Could not update .gitmodules entry %s"), entry.buf);
 110                 strbuf_release(&entry);
 111                 return -1;
 112         }
 113         strbuf_release(&entry);
 114         return 0;
 115 }
 116
 117 /*
 118  * Try to remove the "submodule.<name>" section from .gitmodules where the given
 119  * path is configured. Return 0 only if a .gitmodules file was found, a section
 120  * with the correct path=<path> setting was found and we could remove it.
 121  */
 122 int remove_path_from_gitmodules(const char *path)
 123 {
 124         struct strbuf sect = STRBUF_INIT;
 125         const struct submodule *submodule;
 126
 127         if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
 128                 return -1;
 129
 130         if (is_gitmodules_unmerged(the_repository->index))
 131                 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
 132
 133         submodule = submodule_from_path(the_repository, &null_oid, path);
 134         if (!submodule || !submodule->name) {
 135                 warning(_("Could not find section in .gitmodules where path=%s"), path);
 136                 return -1;
 137         }
 138         strbuf_addstr(&sect, "submodule.");
 139         strbuf_addstr(&sect, submodule->name);
 140         if (git_config_rename_section_in_file(GITMODULES_FILE, sect.buf, NULL) < 0) {
 141                 /* Maybe the user already did that, don't error out here */
 142                 warning(_("Could not remove .gitmodules entry for %s"), path);
 143                 strbuf_release(&sect);
 144                 return -1;
 145         }
 146         strbuf_release(&sect);
 147         return 0;
 148 }
 149
 150 void stage_updated_gitmodules(struct index_state *istate)
 151 {
 152         if (add_file_to_index(istate, GITMODULES_FILE, 0))
 153                 die(_("staging updated .gitmodules failed"));
 154 }
 155
 156 /* TODO: remove this function, use repo_submodule_init instead. */
 157 int add_submodule_odb(const char *path)
 158 {
 159         struct strbuf objects_directory = STRBUF_INIT;
 160         int ret = 0;
 161
 162         ret = strbuf_git_path_submodule(&objects_directory, path, "objects/");
 163         if (ret)
 164                 goto done;
 165         if (!is_directory(objects_directory.buf)) {
 166                 ret = -1;
 167                 goto done;
 168         }
 169         add_to_alternates_memory(objects_directory.buf);
 170 done:
 171         strbuf_release(&objects_directory);
 172         return ret;
 173 }
 174
 175 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
 176                                              const char *path)
 177 {
 178         const struct submodule *submodule = submodule_from_path(the_repository,
 179                                                                 &null_oid, path);
 180         if (submodule) {
 181                 const char *ignore;
 182                 char *key;
 183
 184                 key = xstrfmt("submodule.%s.ignore", submodule->name);
 185                 if (repo_config_get_string_const(the_repository, key, &ignore))
 186                         ignore = submodule->ignore;
 187                 free(key);
 188
 189                 if (ignore)
 190                         handle_ignore_submodules_arg(diffopt, ignore);
 191                 else if (is_gitmodules_unmerged(the_repository->index))
 192                         diffopt->flags.ignore_submodules = 1;
 193         }
 194 }
 195
 196 /* Cheap function that only determines if we're interested in submodules at all */
 197 int git_default_submodule_config(const char *var, const char *value, void *cb)
 198 {
 199         if (!strcmp(var, "submodule.recurse")) {
 200                 int v = git_config_bool(var, value) ?
 201                         RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
 202                 config_update_recurse_submodules = v;
 203         }
 204         return 0;
 205 }
 206
 207 int option_parse_recurse_submodules_worktree_updater(const struct option *opt,
 208                                                      const char *arg, int unset)
 209 {
 210         if (unset) {
 211                 config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
 212                 return 0;
 213         }
 214         if (arg)
 215                 config_update_recurse_submodules =
 216                         parse_update_recurse_submodules_arg(opt->long_name,
 217                                                             arg);
 218         else
 219                 config_update_recurse_submodules = RECURSE_SUBMODULES_ON;
 220
 221         return 0;
 222 }
 223
 224 /*
 225  * Determine if a submodule has been initialized at a given 'path'
 226  */
 227 int is_submodule_active(struct repository *repo, const char *path)
 228 {
 229         int ret = 0;
 230         char *key = NULL;
 231         char *value = NULL;
 232         const struct string_list *sl;
 233         const struct submodule *module;
 234
 235         module = submodule_from_path(repo, &null_oid, path);
 236
 237         /* early return if there isn't a path->module mapping */
 238         if (!module)
 239                 return 0;
 240
 241         /* submodule.<name>.active is set */
 242         key = xstrfmt("submodule.%s.active", module->name);
 243         if (!repo_config_get_bool(repo, key, &ret)) {
 244                 free(key);
 245                 return ret;
 246         }
 247         free(key);
 248
 249         /* submodule.active is set */
 250         sl = repo_config_get_value_multi(repo, "submodule.active");
 251         if (sl) {
 252                 struct pathspec ps;
 253                 struct argv_array args = ARGV_ARRAY_INIT;
 254                 const struct string_list_item *item;
 255
 256                 for_each_string_list_item(item, sl) {
 257                         argv_array_push(&args, item->string);
 258                 }
 259
 260                 parse_pathspec(&ps, 0, 0, NULL, args.argv);
 261                 ret = match_pathspec(repo->index, &ps, path, strlen(path), 0, NULL, 1);
 262
 263                 argv_array_clear(&args);
 264                 clear_pathspec(&ps);
 265                 return ret;
 266         }
 267
 268         /* fallback to checking if the URL is set */
 269         key = xstrfmt("submodule.%s.url", module->name);
 270         ret = !repo_config_get_string(repo, key, &value);
 271
 272         free(value);
 273         free(key);
 274         return ret;
 275 }
 276
 277 int is_submodule_populated_gently(const char *path, int *return_error_code)
 278 {
 279         int ret = 0;
 280         char *gitdir = xstrfmt("%s/.git", path);
 281
 282         if (resolve_gitdir_gently(gitdir, return_error_code))
 283                 ret = 1;
 284
 285         free(gitdir);
 286         return ret;
 287 }
 288
 289 /*
 290  * Dies if the provided 'prefix' corresponds to an unpopulated submodule
 291  */
 292 void die_in_unpopulated_submodule(const struct index_state *istate,
 293                                   const char *prefix)
 294 {
 295         int i, prefixlen;
 296
 297         if (!prefix)
 298                 return;
 299
 300         prefixlen = strlen(prefix);
 301
 302         for (i = 0; i < istate->cache_nr; i++) {
 303                 struct cache_entry *ce = istate->cache[i];
 304                 int ce_len = ce_namelen(ce);
 305
 306                 if (!S_ISGITLINK(ce->ce_mode))
 307                         continue;
 308                 if (prefixlen <= ce_len)
 309                         continue;
 310                 if (strncmp(ce->name, prefix, ce_len))
 311                         continue;
 312                 if (prefix[ce_len] != '/')
 313                         continue;
 314
 315                 die(_("in unpopulated submodule '%s'"), ce->name);
 316         }
 317 }
 318
 319 /*
 320  * Dies if any paths in the provided pathspec descends into a submodule
 321  */
 322 void die_path_inside_submodule(const struct index_state *istate,
 323                                const struct pathspec *ps)
 324 {
 325         int i, j;
 326
 327         for (i = 0; i < istate->cache_nr; i++) {
 328                 struct cache_entry *ce = istate->cache[i];
 329                 int ce_len = ce_namelen(ce);
 330
 331                 if (!S_ISGITLINK(ce->ce_mode))
 332                         continue;
 333
 334                 for (j = 0; j < ps->nr ; j++) {
 335                         const struct pathspec_item *item = &ps->items[j];
 336
 337                         if (item->len <= ce_len)
 338                                 continue;
 339                         if (item->match[ce_len] != '/')
 340                                 continue;
 341                         if (strncmp(ce->name, item->match, ce_len))
 342                                 continue;
 343                         if (item->len == ce_len + 1)
 344                                 continue;
 345
 346                         die(_("Pathspec '%s' is in submodule '%.*s'"),
 347                             item->original, ce_len, ce->name);
 348                 }
 349         }
 350 }
 351
 352 enum submodule_update_type parse_submodule_update_type(const char *value)
 353 {
 354         if (!strcmp(value, "none"))
 355                 return SM_UPDATE_NONE;
 356         else if (!strcmp(value, "checkout"))
 357                 return SM_UPDATE_CHECKOUT;
 358         else if (!strcmp(value, "rebase"))
 359                 return SM_UPDATE_REBASE;
 360         else if (!strcmp(value, "merge"))
 361                 return SM_UPDATE_MERGE;
 362         else if (*value == '!')
 363                 return SM_UPDATE_COMMAND;
 364         else
 365                 return SM_UPDATE_UNSPECIFIED;
 366 }
 367
 368 int parse_submodule_update_strategy(const char *value,
 369                 struct submodule_update_strategy *dst)
 370 {
 371         enum submodule_update_type type;
 372
 373         free((void*)dst->command);
 374         dst->command = NULL;
 375
 376         type = parse_submodule_update_type(value);
 377         if (type == SM_UPDATE_UNSPECIFIED)
 378                 return -1;
 379
 380         dst->type = type;
 381         if (type == SM_UPDATE_COMMAND)
 382                 dst->command = xstrdup(value + 1);
 383
 384         return 0;
 385 }
 386
 387 const char *submodule_strategy_to_string(const struct submodule_update_strategy *s)
 388 {
 389         struct strbuf sb = STRBUF_INIT;
 390         switch (s->type) {
 391         case SM_UPDATE_CHECKOUT:
 392                 return "checkout";
 393         case SM_UPDATE_MERGE:
 394                 return "merge";
 395         case SM_UPDATE_REBASE:
 396                 return "rebase";
 397         case SM_UPDATE_NONE:
 398                 return "none";
 399         case SM_UPDATE_UNSPECIFIED:
 400                 return NULL;
 401         case SM_UPDATE_COMMAND:
 402                 strbuf_addf(&sb, "!%s", s->command);
 403                 return strbuf_detach(&sb, NULL);
 404         }
 405         return NULL;
 406 }
 407
 408 void handle_ignore_submodules_arg(struct diff_options *diffopt,
 409                                   const char *arg)
 410 {
 411         diffopt->flags.ignore_submodules = 0;
 412         diffopt->flags.ignore_untracked_in_submodules = 0;
 413         diffopt->flags.ignore_dirty_submodules = 0;
 414
 415         if (!strcmp(arg, "all"))
 416                 diffopt->flags.ignore_submodules = 1;
 417         else if (!strcmp(arg, "untracked"))
 418                 diffopt->flags.ignore_untracked_in_submodules = 1;
 419         else if (!strcmp(arg, "dirty"))
 420                 diffopt->flags.ignore_dirty_submodules = 1;
 421         else if (strcmp(arg, "none"))
 422                 die("bad --ignore-submodules argument: %s", arg);
 423 }
 424
 425 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
 426                 struct commit *left, struct commit *right,
 427                 struct commit_list *merge_bases)
 428 {
 429         struct commit_list *list;
 430
 431         repo_init_revisions(the_repository, rev, NULL);
 432         setup_revisions(0, NULL, rev, NULL);
 433         rev->left_right = 1;
 434         rev->first_parent_only = 1;
 435         left->object.flags |= SYMMETRIC_LEFT;
 436         add_pending_object(rev, &left->object, path);
 437         add_pending_object(rev, &right->object, path);
 438         for (list = merge_bases; list; list = list->next) {
 439                 list->item->object.flags |= UNINTERESTING;
 440                 add_pending_object(rev, &list->item->object,
 441                         oid_to_hex(&list->item->object.oid));
 442         }
 443         return prepare_revision_walk(rev);
 444 }
 445
 446 static void print_submodule_summary(struct rev_info *rev, struct diff_options *o)
 447 {
 448         static const char format[] = "  %m %s";
 449         struct strbuf sb = STRBUF_INIT;
 450         struct commit *commit;
 451
 452         while ((commit = get_revision(rev))) {
 453                 struct pretty_print_context ctx = {0};
 454                 ctx.date_mode = rev->date_mode;
 455                 ctx.output_encoding = get_log_output_encoding();
 456                 strbuf_setlen(&sb, 0);
 457                 format_commit_message(commit, format, &sb, &ctx);
 458                 strbuf_addch(&sb, '\n');
 459                 if (commit->object.flags & SYMMETRIC_LEFT)
 460                         diff_emit_submodule_del(o, sb.buf);
 461                 else
 462                         diff_emit_submodule_add(o, sb.buf);
 463         }
 464         strbuf_release(&sb);
 465 }
 466
 467 static void prepare_submodule_repo_env_no_git_dir(struct argv_array *out)
 468 {
 469         const char * const *var;
 470
 471         for (var = local_repo_env; *var; var++) {
 472                 if (strcmp(*var, CONFIG_DATA_ENVIRONMENT))
 473                         argv_array_push(out, *var);
 474         }
 475 }
 476
 477 void prepare_submodule_repo_env(struct argv_array *out)
 478 {
 479         prepare_submodule_repo_env_no_git_dir(out);
 480         argv_array_pushf(out, "%s=%s", GIT_DIR_ENVIRONMENT,
 481                          DEFAULT_GIT_DIR_ENVIRONMENT);
 482 }
 483
 484 /* Helper function to display the submodule header line prior to the full
 485  * summary output. If it can locate the submodule objects directory it will
 486  * attempt to lookup both the left and right commits and put them into the
 487  * left and right pointers.
 488  */
 489 static void show_submodule_header(struct diff_options *o, const char *path,
 490                 struct object_id *one, struct object_id *two,
 491                 unsigned dirty_submodule,
 492                 struct commit **left, struct commit **right,
 493                 struct commit_list **merge_bases)
 494 {
 495         const char *message = NULL;
 496         struct strbuf sb = STRBUF_INIT;
 497         int fast_forward = 0, fast_backward = 0;
 498
 499         if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
 500                 diff_emit_submodule_untracked(o, path);
 501
 502         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 503                 diff_emit_submodule_modified(o, path);
 504
 505         if (is_null_oid(one))
 506                 message = "(new submodule)";
 507         else if (is_null_oid(two))
 508                 message = "(submodule deleted)";
 509
 510         if (add_submodule_odb(path)) {
 511                 if (!message)
 512                         message = "(commits not present)";
 513                 goto output_header;
 514         }
 515
 516         /*
 517          * Attempt to lookup the commit references, and determine if this is
 518          * a fast forward or fast backwards update.
 519          */
 520         *left = lookup_commit_reference(the_repository, one);
 521         *right = lookup_commit_reference(the_repository, two);
 522
 523         /*
 524          * Warn about missing commits in the submodule project, but only if
 525          * they aren't null.
 526          */
 527         if ((!is_null_oid(one) && !*left) ||
 528              (!is_null_oid(two) && !*right))
 529                 message = "(commits not present)";
 530
 531         *merge_bases = get_merge_bases(*left, *right);
 532         if (*merge_bases) {
 533                 if ((*merge_bases)->item == *left)
 534                         fast_forward = 1;
 535                 else if ((*merge_bases)->item == *right)
 536                         fast_backward = 1;
 537         }
 538
 539         if (oideq(one, two)) {
 540                 strbuf_release(&sb);
 541                 return;
 542         }
 543
 544 output_header:
 545         strbuf_addf(&sb, "Submodule %s ", path);
 546         strbuf_add_unique_abbrev(&sb, one, DEFAULT_ABBREV);
 547         strbuf_addstr(&sb, (fast_backward || fast_forward) ? ".." : "...");
 548         strbuf_add_unique_abbrev(&sb, two, DEFAULT_ABBREV);
 549         if (message)
 550                 strbuf_addf(&sb, " %s\n", message);
 551         else
 552                 strbuf_addf(&sb, "%s:\n", fast_backward ? " (rewind)" : "");
 553         diff_emit_submodule_header(o, sb.buf);
 554
 555         strbuf_release(&sb);
 556 }
 557
 558 void show_submodule_summary(struct diff_options *o, const char *path,
 559                 struct object_id *one, struct object_id *two,
 560                 unsigned dirty_submodule)
 561 {
 562         struct rev_info rev;
 563         struct commit *left = NULL, *right = NULL;
 564         struct commit_list *merge_bases = NULL;
 565
 566         show_submodule_header(o, path, one, two, dirty_submodule,
 567                               &left, &right, &merge_bases);
 568
 569         /*
 570          * If we don't have both a left and a right pointer, there is no
 571          * reason to try and display a summary. The header line should contain
 572          * all the information the user needs.
 573          */
 574         if (!left || !right)
 575                 goto out;
 576
 577         /* Treat revision walker failure the same as missing commits */
 578         if (prepare_submodule_summary(&rev, path, left, right, merge_bases)) {
 579                 diff_emit_submodule_error(o, "(revision walker failed)\n");
 580                 goto out;
 581         }
 582
 583         print_submodule_summary(&rev, o);
 584
 585 out:
 586         if (merge_bases)
 587                 free_commit_list(merge_bases);
 588         clear_commit_marks(left, ~0);
 589         clear_commit_marks(right, ~0);
 590 }
 591
 592 void show_submodule_inline_diff(struct diff_options *o, const char *path,
 593                 struct object_id *one, struct object_id *two,
 594                 unsigned dirty_submodule)
 595 {
 596         const struct object_id *old_oid = the_hash_algo->empty_tree, *new_oid = the_hash_algo->empty_tree;
 597         struct commit *left = NULL, *right = NULL;
 598         struct commit_list *merge_bases = NULL;
 599         struct child_process cp = CHILD_PROCESS_INIT;
 600         struct strbuf sb = STRBUF_INIT;
 601
 602         show_submodule_header(o, path, one, two, dirty_submodule,
 603                               &left, &right, &merge_bases);
 604
 605         /* We need a valid left and right commit to display a difference */
 606         if (!(left || is_null_oid(one)) ||
 607             !(right || is_null_oid(two)))
 608                 goto done;
 609
 610         if (left)
 611                 old_oid = one;
 612         if (right)
 613                 new_oid = two;
 614
 615         cp.git_cmd = 1;
 616         cp.dir = path;
 617         cp.out = -1;
 618         cp.no_stdin = 1;
 619
 620         /* TODO: other options may need to be passed here. */
 621         argv_array_pushl(&cp.args, "diff", "--submodule=diff", NULL);
 622         argv_array_pushf(&cp.args, "--color=%s", want_color(o->use_color) ?
 623                          "always" : "never");
 624
 625         if (o->flags.reverse_diff) {
 626                 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
 627                                  o->b_prefix, path);
 628                 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
 629                                  o->a_prefix, path);
 630         } else {
 631                 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
 632                                  o->a_prefix, path);
 633                 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
 634                                  o->b_prefix, path);
 635         }
 636         argv_array_push(&cp.args, oid_to_hex(old_oid));
 637         /*
 638          * If the submodule has modified content, we will diff against the
 639          * work tree, under the assumption that the user has asked for the
 640          * diff format and wishes to actually see all differences even if they
 641          * haven't yet been committed to the submodule yet.
 642          */
 643         if (!(dirty_submodule & DIRTY_SUBMODULE_MODIFIED))
 644                 argv_array_push(&cp.args, oid_to_hex(new_oid));
 645
 646         prepare_submodule_repo_env(&cp.env_array);
 647         if (start_command(&cp))
 648                 diff_emit_submodule_error(o, "(diff failed)\n");
 649
 650         while (strbuf_getwholeline_fd(&sb, cp.out, '\n') != EOF)
 651                 diff_emit_submodule_pipethrough(o, sb.buf, sb.len);
 652
 653         if (finish_command(&cp))
 654                 diff_emit_submodule_error(o, "(diff failed)\n");
 655
 656 done:
 657         strbuf_release(&sb);
 658         if (merge_bases)
 659                 free_commit_list(merge_bases);
 660         if (left)
 661                 clear_commit_marks(left, ~0);
 662         if (right)
 663                 clear_commit_marks(right, ~0);
 664 }
 665
 666 int should_update_submodules(void)
 667 {
 668         return config_update_recurse_submodules == RECURSE_SUBMODULES_ON;
 669 }
 670
 671 const struct submodule *submodule_from_ce(const struct cache_entry *ce)
 672 {
 673         if (!S_ISGITLINK(ce->ce_mode))
 674                 return NULL;
 675
 676         if (!should_update_submodules())
 677                 return NULL;
 678
 679         return submodule_from_path(the_repository, &null_oid, ce->name);
 680 }
 681
 682 static struct oid_array *submodule_commits(struct string_list *submodules,
 683                                            const char *name)
 684 {
 685         struct string_list_item *item;
 686
 687         item = string_list_insert(submodules, name);
 688         if (item->util)
 689                 return (struct oid_array *) item->util;
 690
 691         /* NEEDSWORK: should we have oid_array_init()? */
 692         item->util = xcalloc(1, sizeof(struct oid_array));
 693         return (struct oid_array *) item->util;
 694 }
 695
 696 struct collect_changed_submodules_cb_data {
 697         struct string_list *changed;
 698         const struct object_id *commit_oid;
 699 };
 700
 701 /*
 702  * this would normally be two functions: default_name_from_path() and
 703  * path_from_default_name(). Since the default name is the same as
 704  * the submodule path we can get away with just one function which only
 705  * checks whether there is a submodule in the working directory at that
 706  * location.
 707  */
 708 static const char *default_name_or_path(const char *path_or_name)
 709 {
 710         int error_code;
 711
 712         if (!is_submodule_populated_gently(path_or_name, &error_code))
 713                 return NULL;
 714
 715         return path_or_name;
 716 }
 717
 718 static void collect_changed_submodules_cb(struct diff_queue_struct *q,
 719                                           struct diff_options *options,
 720                                           void *data)
 721 {
 722         struct collect_changed_submodules_cb_data *me = data;
 723         struct string_list *changed = me->changed;
 724         const struct object_id *commit_oid = me->commit_oid;
 725         int i;
 726
 727         for (i = 0; i < q->nr; i++) {
 728                 struct diff_filepair *p = q->queue[i];
 729                 struct oid_array *commits;
 730                 const struct submodule *submodule;
 731                 const char *name;
 732
 733                 if (!S_ISGITLINK(p->two->mode))
 734                         continue;
 735
 736                 submodule = submodule_from_path(the_repository,
 737                                                 commit_oid, p->two->path);
 738                 if (submodule)
 739                         name = submodule->name;
 740                 else {
 741                         name = default_name_or_path(p->two->path);
 742                         /* make sure name does not collide with existing one */
 743                         if (name)
 744                                 submodule = submodule_from_name(the_repository,
 745                                                                 commit_oid, name);
 746                         if (submodule) {
 747                                 warning("Submodule in commit %s at path: "
 748                                         "'%s' collides with a submodule named "
 749                                         "the same. Skipping it.",
 750                                         oid_to_hex(commit_oid), p->two->path);
 751                                 name = NULL;
 752                         }
 753                 }
 754
 755                 if (!name)
 756                         continue;
 757
 758                 commits = submodule_commits(changed, name);
 759                 oid_array_append(commits, &p->two->oid);
 760         }
 761 }
 762
 763 /*
 764  * Collect the paths of submodules in 'changed' which have changed based on
 765  * the revisions as specified in 'argv'.  Each entry in 'changed' will also
 766  * have a corresponding 'struct oid_array' (in the 'util' field) which lists
 767  * what the submodule pointers were updated to during the change.
 768  */
 769 static void collect_changed_submodules(struct index_state *istate,
 770                                        struct string_list *changed,
 771                                        struct argv_array *argv)
 772 {
 773         struct rev_info rev;
 774         const struct commit *commit;
 775
 776         repo_init_revisions(the_repository, &rev, NULL);
 777         setup_revisions(argv->argc, argv->argv, &rev, NULL);
 778         if (prepare_revision_walk(&rev))
 779                 die("revision walk setup failed");
 780
 781         while ((commit = get_revision(&rev))) {
 782                 struct rev_info diff_rev;
 783                 struct collect_changed_submodules_cb_data data;
 784                 data.changed = changed;
 785                 data.commit_oid = &commit->object.oid;
 786
 787                 repo_init_revisions(the_repository, &diff_rev, NULL);
 788                 diff_rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
 789                 diff_rev.diffopt.format_callback = collect_changed_submodules_cb;
 790                 diff_rev.diffopt.format_callback_data = &data;
 791                 diff_tree_combined_merge(commit, 1, &diff_rev);
 792         }
 793
 794         reset_revision_walk();
 795 }
 796
 797 static void free_submodules_oids(struct string_list *submodules)
 798 {
 799         struct string_list_item *item;
 800         for_each_string_list_item(item, submodules)
 801                 oid_array_clear((struct oid_array *) item->util);
 802         string_list_clear(submodules, 1);
 803 }
 804
 805 static int has_remote(const char *refname, const struct object_id *oid,
 806                       int flags, void *cb_data)
 807 {
 808         return 1;
 809 }
 810
 811 static int append_oid_to_argv(const struct object_id *oid, void *data)
 812 {
 813         struct argv_array *argv = data;
 814         argv_array_push(argv, oid_to_hex(oid));
 815         return 0;
 816 }
 817
 818 struct has_commit_data {
 819         int result;
 820         const char *path;
 821 };
 822
 823 static int check_has_commit(const struct object_id *oid, void *data)
 824 {
 825         struct has_commit_data *cb = data;
 826
 827         enum object_type type = oid_object_info(the_repository, oid, NULL);
 828
 829         switch (type) {
 830         case OBJ_COMMIT:
 831                 return 0;
 832         case OBJ_BAD:
 833                 /*
 834                  * Object is missing or invalid. If invalid, an error message
 835                  * has already been printed.
 836                  */
 837                 cb->result = 0;
 838                 return 0;
 839         default:
 840                 die(_("submodule entry '%s' (%s) is a %s, not a commit"),
 841                     cb->path, oid_to_hex(oid), type_name(type));
 842         }
 843 }
 844
 845 static int submodule_has_commits(const char *path, struct oid_array *commits)
 846 {
 847         struct has_commit_data has_commit = { 1, path };
 848
 849         /*
 850          * Perform a cheap, but incorrect check for the existence of 'commits'.
 851          * This is done by adding the submodule's object store to the in-core
 852          * object store, and then querying for each commit's existence.  If we
 853          * do not have the commit object anywhere, there is no chance we have
 854          * it in the object store of the correct submodule and have it
 855          * reachable from a ref, so we can fail early without spawning rev-list
 856          * which is expensive.
 857          */
 858         if (add_submodule_odb(path))
 859                 return 0;
 860
 861         oid_array_for_each_unique(commits, check_has_commit, &has_commit);
 862
 863         if (has_commit.result) {
 864                 /*
 865                  * Even if the submodule is checked out and the commit is
 866                  * present, make sure it exists in the submodule's object store
 867                  * and that it is reachable from a ref.
 868                  */
 869                 struct child_process cp = CHILD_PROCESS_INIT;
 870                 struct strbuf out = STRBUF_INIT;
 871
 872                 argv_array_pushl(&cp.args, "rev-list", "-n", "1", NULL);
 873                 oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
 874                 argv_array_pushl(&cp.args, "--not", "--all", NULL);
 875
 876                 prepare_submodule_repo_env(&cp.env_array);
 877                 cp.git_cmd = 1;
 878                 cp.no_stdin = 1;
 879                 cp.dir = path;
 880
 881                 if (capture_command(&cp, &out, GIT_MAX_HEXSZ + 1) || out.len)
 882                         has_commit.result = 0;
 883
 884                 strbuf_release(&out);
 885         }
 886
 887         return has_commit.result;
 888 }
 889
 890 static int submodule_needs_pushing(const char *path, struct oid_array *commits)
 891 {
 892         if (!submodule_has_commits(path, commits))
 893                 /*
 894                  * NOTE: We do consider it safe to return "no" here. The
 895                  * correct answer would be "We do not know" instead of
 896                  * "No push needed", but it is quite hard to change
 897                  * the submodule pointer without having the submodule
 898                  * around. If a user did however change the submodules
 899                  * without having the submodule around, this indicates
 900                  * an expert who knows what they are doing or a
 901                  * maintainer integrating work from other people. In
 902                  * both cases it should be safe to skip this check.
 903                  */
 904                 return 0;
 905
 906         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 907                 struct child_process cp = CHILD_PROCESS_INIT;
 908                 struct strbuf buf = STRBUF_INIT;
 909                 int needs_pushing = 0;
 910
 911                 argv_array_push(&cp.args, "rev-list");
 912                 oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
 913                 argv_array_pushl(&cp.args, "--not", "--remotes", "-n", "1" , NULL);
 914
 915                 prepare_submodule_repo_env(&cp.env_array);
 916                 cp.git_cmd = 1;
 917                 cp.no_stdin = 1;
 918                 cp.out = -1;
 919                 cp.dir = path;
 920                 if (start_command(&cp))
 921                         die("Could not run 'git rev-list <commits> --not --remotes -n 1' command in submodule %s",
 922                                         path);
 923                 if (strbuf_read(&buf, cp.out, 41))
 924                         needs_pushing = 1;
 925                 finish_command(&cp);
 926                 close(cp.out);
 927                 strbuf_release(&buf);
 928                 return needs_pushing;
 929         }
 930
 931         return 0;
 932 }
 933
 934 int find_unpushed_submodules(struct index_state *istate,
 935                              struct oid_array *commits,
 936                              const char *remotes_name,
 937                              struct string_list *needs_pushing)
 938 {
 939         struct string_list submodules = STRING_LIST_INIT_DUP;
 940         struct string_list_item *name;
 941         struct argv_array argv = ARGV_ARRAY_INIT;
 942
 943         /* argv.argv[0] will be ignored by setup_revisions */
 944         argv_array_push(&argv, "find_unpushed_submodules");
 945         oid_array_for_each_unique(commits, append_oid_to_argv, &argv);
 946         argv_array_push(&argv, "--not");
 947         argv_array_pushf(&argv, "--remotes=%s", remotes_name);
 948
 949         collect_changed_submodules(istate, &submodules, &argv);
 950
 951         for_each_string_list_item(name, &submodules) {
 952                 struct oid_array *commits = name->util;
 953                 const struct submodule *submodule;
 954                 const char *path = NULL;
 955
 956                 submodule = submodule_from_name(the_repository, &null_oid, name->string);
 957                 if (submodule)
 958                         path = submodule->path;
 959                 else
 960                         path = default_name_or_path(name->string);
 961
 962                 if (!path)
 963                         continue;
 964
 965                 if (submodule_needs_pushing(path, commits))
 966                         string_list_insert(needs_pushing, path);
 967         }
 968
 969         free_submodules_oids(&submodules);
 970         argv_array_clear(&argv);
 971
 972         return needs_pushing->nr;
 973 }
 974
 975 static int push_submodule(const char *path,
 976                           const struct remote *remote,
 977                           const struct refspec *rs,
 978                           const struct string_list *push_options,
 979                           int dry_run)
 980 {
 981         if (add_submodule_odb(path))
 982                 return 1;
 983
 984         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 985                 struct child_process cp = CHILD_PROCESS_INIT;
 986                 argv_array_push(&cp.args, "push");
 987                 if (dry_run)
 988                         argv_array_push(&cp.args, "--dry-run");
 989
 990                 if (push_options && push_options->nr) {
 991                         const struct string_list_item *item;
 992                         for_each_string_list_item(item, push_options)
 993                                 argv_array_pushf(&cp.args, "--push-option=%s",
 994                                                  item->string);
 995                 }
 996
 997                 if (remote->origin != REMOTE_UNCONFIGURED) {
 998                         int i;
 999                         argv_array_push(&cp.args, remote->name);
1000                         for (i = 0; i < rs->raw_nr; i++)
1001                                 argv_array_push(&cp.args, rs->raw[i]);
1002                 }
1003
1004                 prepare_submodule_repo_env(&cp.env_array);
1005                 cp.git_cmd = 1;
1006                 cp.no_stdin = 1;
1007                 cp.dir = path;
1008                 if (run_command(&cp))
1009                         return 0;
1010                 close(cp.out);
1011         }
1012
1013         return 1;
1014 }
1015
1016 /*
1017  * Perform a check in the submodule to see if the remote and refspec work.
1018  * Die if the submodule can't be pushed.
1019  */
1020 static void submodule_push_check(const char *path, const char *head,
1021                                  const struct remote *remote,
1022                                  const struct refspec *rs)
1023 {
1024         struct child_process cp = CHILD_PROCESS_INIT;
1025         int i;
1026
1027         argv_array_push(&cp.args, "submodule--helper");
1028         argv_array_push(&cp.args, "push-check");
1029         argv_array_push(&cp.args, head);
1030         argv_array_push(&cp.args, remote->name);
1031
1032         for (i = 0; i < rs->raw_nr; i++)
1033                 argv_array_push(&cp.args, rs->raw[i]);
1034
1035         prepare_submodule_repo_env(&cp.env_array);
1036         cp.git_cmd = 1;
1037         cp.no_stdin = 1;
1038         cp.no_stdout = 1;
1039         cp.dir = path;
1040
1041         /*
1042          * Simply indicate if 'submodule--helper push-check' failed.
1043          * More detailed error information will be provided by the
1044          * child process.
1045          */
1046         if (run_command(&cp))
1047                 die("process for submodule '%s' failed", path);
1048 }
1049
1050 int push_unpushed_submodules(struct index_state *istate,
1051                              struct oid_array *commits,
1052                              const struct remote *remote,
1053                              const struct refspec *rs,
1054                              const struct string_list *push_options,
1055                              int dry_run)
1056 {
1057         int i, ret = 1;
1058         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1059
1060         if (!find_unpushed_submodules(istate, commits,
1061                                       remote->name, &needs_pushing))
1062                 return 1;
1063
1064         /*
1065          * Verify that the remote and refspec can be propagated to all
1066          * submodules.  This check can be skipped if the remote and refspec
1067          * won't be propagated due to the remote being unconfigured (e.g. a URL
1068          * instead of a remote name).
1069          */
1070         if (remote->origin != REMOTE_UNCONFIGURED) {
1071                 char *head;
1072                 struct object_id head_oid;
1073
1074                 head = resolve_refdup("HEAD", 0, &head_oid, NULL);
1075                 if (!head)
1076                         die(_("Failed to resolve HEAD as a valid ref."));
1077
1078                 for (i = 0; i < needs_pushing.nr; i++)
1079                         submodule_push_check(needs_pushing.items[i].string,
1080                                              head, remote, rs);
1081                 free(head);
1082         }
1083
1084         /* Actually push the submodules */
1085         for (i = 0; i < needs_pushing.nr; i++) {
1086                 const char *path = needs_pushing.items[i].string;
1087                 fprintf(stderr, "Pushing submodule '%s'\n", path);
1088                 if (!push_submodule(path, remote, rs,
1089                                     push_options, dry_run)) {
1090                         fprintf(stderr, "Unable to push submodule '%s'\n", path);
1091                         ret = 0;
1092                 }
1093         }
1094
1095         string_list_clear(&needs_pushing, 0);
1096
1097         return ret;
1098 }
1099
1100 static int append_oid_to_array(const char *ref, const struct object_id *oid,
1101                                int flags, void *data)
1102 {
1103         struct oid_array *array = data;
1104         oid_array_append(array, oid);
1105         return 0;
1106 }
1107
1108 void check_for_new_submodule_commits(struct object_id *oid)
1109 {
1110         if (!initialized_fetch_ref_tips) {
1111                 for_each_ref(append_oid_to_array, &ref_tips_before_fetch);
1112                 initialized_fetch_ref_tips = 1;
1113         }
1114
1115         oid_array_append(&ref_tips_after_fetch, oid);
1116 }
1117
1118 static void calculate_changed_submodule_paths(struct index_state *istate)
1119 {
1120         struct argv_array argv = ARGV_ARRAY_INIT;
1121         struct string_list changed_submodules = STRING_LIST_INIT_DUP;
1122         const struct string_list_item *name;
1123
1124         /* No need to check if there are no submodules configured */
1125         if (!submodule_from_path(the_repository, NULL, NULL))
1126                 return;
1127
1128         argv_array_push(&argv, "--"); /* argv[0] program name */
1129         oid_array_for_each_unique(&ref_tips_after_fetch,
1130                                    append_oid_to_argv, &argv);
1131         argv_array_push(&argv, "--not");
1132         oid_array_for_each_unique(&ref_tips_before_fetch,
1133                                    append_oid_to_argv, &argv);
1134
1135         /*
1136          * Collect all submodules (whether checked out or not) for which new
1137          * commits have been recorded upstream in "changed_submodule_names".
1138          */
1139         collect_changed_submodules(istate, &changed_submodules, &argv);
1140
1141         for_each_string_list_item(name, &changed_submodules) {
1142                 struct oid_array *commits = name->util;
1143                 const struct submodule *submodule;
1144                 const char *path = NULL;
1145
1146                 submodule = submodule_from_name(the_repository, &null_oid, name->string);
1147                 if (submodule)
1148                         path = submodule->path;
1149                 else
1150                         path = default_name_or_path(name->string);
1151
1152                 if (!path)
1153                         continue;
1154
1155                 if (!submodule_has_commits(path, commits))
1156                         string_list_append(&changed_submodule_names, name->string);
1157         }
1158
1159         free_submodules_oids(&changed_submodules);
1160         argv_array_clear(&argv);
1161         oid_array_clear(&ref_tips_before_fetch);
1162         oid_array_clear(&ref_tips_after_fetch);
1163         initialized_fetch_ref_tips = 0;
1164 }
1165
1166 int submodule_touches_in_range(struct index_state *istate,
1167                                struct object_id *excl_oid,
1168                                struct object_id *incl_oid)
1169 {
1170         struct string_list subs = STRING_LIST_INIT_DUP;
1171         struct argv_array args = ARGV_ARRAY_INIT;
1172         int ret;
1173
1174         /* No need to check if there are no submodules configured */
1175         if (!submodule_from_path(the_repository, NULL, NULL))
1176                 return 0;
1177
1178         argv_array_push(&args, "--"); /* args[0] program name */
1179         argv_array_push(&args, oid_to_hex(incl_oid));
1180         if (!is_null_oid(excl_oid)) {
1181                 argv_array_push(&args, "--not");
1182                 argv_array_push(&args, oid_to_hex(excl_oid));
1183         }
1184
1185         collect_changed_submodules(istate, &subs, &args);
1186         ret = subs.nr;
1187
1188         argv_array_clear(&args);
1189
1190         free_submodules_oids(&subs);
1191         return ret;
1192 }
1193
1194 struct submodule_parallel_fetch {
1195         int count;
1196         struct argv_array args;
1197         struct repository *r;
1198         const char *prefix;
1199         int command_line_option;
1200         int default_option;
1201         int quiet;
1202         int result;
1203 };
1204 #define SPF_INIT {0, ARGV_ARRAY_INIT, NULL, NULL, 0, 0, 0, 0}
1205
1206 static int get_fetch_recurse_config(const struct submodule *submodule,
1207                                     struct submodule_parallel_fetch *spf)
1208 {
1209         if (spf->command_line_option != RECURSE_SUBMODULES_DEFAULT)
1210                 return spf->command_line_option;
1211
1212         if (submodule) {
1213                 char *key;
1214                 const char *value;
1215
1216                 int fetch_recurse = submodule->fetch_recurse;
1217                 key = xstrfmt("submodule.%s.fetchRecurseSubmodules", submodule->name);
1218                 if (!repo_config_get_string_const(spf->r, key, &value)) {
1219                         fetch_recurse = parse_fetch_recurse_submodules_arg(key, value);
1220                 }
1221                 free(key);
1222
1223                 if (fetch_recurse != RECURSE_SUBMODULES_NONE)
1224                         /* local config overrules everything except commandline */
1225                         return fetch_recurse;
1226         }
1227
1228         return spf->default_option;
1229 }
1230
1231 static int get_next_submodule(struct child_process *cp,
1232                               struct strbuf *err, void *data, void **task_cb)
1233 {
1234         int ret = 0;
1235         struct submodule_parallel_fetch *spf = data;
1236
1237         for (; spf->count < spf->r->index->cache_nr; spf->count++) {
1238                 struct strbuf submodule_path = STRBUF_INIT;
1239                 struct strbuf submodule_git_dir = STRBUF_INIT;
1240                 struct strbuf submodule_prefix = STRBUF_INIT;
1241                 const struct cache_entry *ce = spf->r->index->cache[spf->count];
1242                 const char *git_dir, *default_argv;
1243                 const struct submodule *submodule;
1244                 struct submodule default_submodule = SUBMODULE_INIT;
1245
1246                 if (!S_ISGITLINK(ce->ce_mode))
1247                         continue;
1248
1249                 submodule = submodule_from_path(spf->r, &null_oid, ce->name);
1250                 if (!submodule) {
1251                         const char *name = default_name_or_path(ce->name);
1252                         if (name) {
1253                                 default_submodule.path = default_submodule.name = name;
1254                                 submodule = &default_submodule;
1255                         }
1256                 }
1257
1258                 switch (get_fetch_recurse_config(submodule, spf))
1259                 {
1260                 default:
1261                 case RECURSE_SUBMODULES_DEFAULT:
1262                 case RECURSE_SUBMODULES_ON_DEMAND:
1263                         if (!submodule || !unsorted_string_list_lookup(&changed_submodule_names,
1264                                                          submodule->name))
1265                                 continue;
1266                         default_argv = "on-demand";
1267                         break;
1268                 case RECURSE_SUBMODULES_ON:
1269                         default_argv = "yes";
1270                         break;
1271                 case RECURSE_SUBMODULES_OFF:
1272                         continue;
1273                 }
1274
1275                 strbuf_repo_worktree_path(&submodule_path, spf->r, "%s", ce->name);
1276                 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
1277                 strbuf_addf(&submodule_prefix, "%s%s/", spf->prefix, ce->name);
1278                 git_dir = read_gitfile(submodule_git_dir.buf);
1279                 if (!git_dir)
1280                         git_dir = submodule_git_dir.buf;
1281                 if (is_directory(git_dir)) {
1282                         child_process_init(cp);
1283                         cp->dir = strbuf_detach(&submodule_path, NULL);
1284                         prepare_submodule_repo_env(&cp->env_array);
1285                         cp->git_cmd = 1;
1286                         if (!spf->quiet)
1287                                 strbuf_addf(err, "Fetching submodule %s%s\n",
1288                                             spf->prefix, ce->name);
1289                         argv_array_init(&cp->args);
1290                         argv_array_pushv(&cp->args, spf->args.argv);
1291                         argv_array_push(&cp->args, default_argv);
1292                         argv_array_push(&cp->args, "--submodule-prefix");
1293                         argv_array_push(&cp->args, submodule_prefix.buf);
1294                         ret = 1;
1295                 }
1296                 strbuf_release(&submodule_path);
1297                 strbuf_release(&submodule_git_dir);
1298                 strbuf_release(&submodule_prefix);
1299                 if (ret) {
1300                         spf->count++;
1301                         return 1;
1302                 }
1303         }
1304         return 0;
1305 }
1306
1307 static int fetch_start_failure(struct strbuf *err,
1308                                void *cb, void *task_cb)
1309 {
1310         struct submodule_parallel_fetch *spf = cb;
1311
1312         spf->result = 1;
1313
1314         return 0;
1315 }
1316
1317 static int fetch_finish(int retvalue, struct strbuf *err,
1318                         void *cb, void *task_cb)
1319 {
1320         struct submodule_parallel_fetch *spf = cb;
1321
1322         if (retvalue)
1323                 spf->result = 1;
1324
1325         return 0;
1326 }
1327
1328 int fetch_populated_submodules(struct repository *r,
1329                                const struct argv_array *options,
1330                                const char *prefix, int command_line_option,
1331                                int default_option,
1332                                int quiet, int max_parallel_jobs)
1333 {
1334         int i;
1335         struct submodule_parallel_fetch spf = SPF_INIT;
1336
1337         spf.r = r;
1338         spf.command_line_option = command_line_option;
1339         spf.default_option = default_option;
1340         spf.quiet = quiet;
1341         spf.prefix = prefix;
1342
1343         if (!r->worktree)
1344                 goto out;
1345
1346         if (repo_read_index(r) < 0)
1347                 die("index file corrupt");
1348
1349         argv_array_push(&spf.args, "fetch");
1350         for (i = 0; i < options->argc; i++)
1351                 argv_array_push(&spf.args, options->argv[i]);
1352         argv_array_push(&spf.args, "--recurse-submodules-default");
1353         /* default value, "--submodule-prefix" and its value are added later */
1354
1355         calculate_changed_submodule_paths(r->index);
1356         run_processes_parallel(max_parallel_jobs,
1357                                get_next_submodule,
1358                                fetch_start_failure,
1359                                fetch_finish,
1360                                &spf);
1361
1362         argv_array_clear(&spf.args);
1363 out:
1364         string_list_clear(&changed_submodule_names, 1);
1365         return spf.result;
1366 }
1367
1368 unsigned is_submodule_modified(const char *path, int ignore_untracked)
1369 {
1370         struct child_process cp = CHILD_PROCESS_INIT;
1371         struct strbuf buf = STRBUF_INIT;
1372         FILE *fp;
1373         unsigned dirty_submodule = 0;
1374         const char *git_dir;
1375         int ignore_cp_exit_code = 0;
1376
1377         strbuf_addf(&buf, "%s/.git", path);
1378         git_dir = read_gitfile(buf.buf);
1379         if (!git_dir)
1380                 git_dir = buf.buf;
1381         if (!is_git_directory(git_dir)) {
1382                 if (is_directory(git_dir))
1383                         die(_("'%s' not recognized as a git repository"), git_dir);
1384                 strbuf_release(&buf);
1385                 /* The submodule is not checked out, so it is not modified */
1386                 return 0;
1387         }
1388         strbuf_reset(&buf);
1389
1390         argv_array_pushl(&cp.args, "status", "--porcelain=2", NULL);
1391         if (ignore_untracked)
1392                 argv_array_push(&cp.args, "-uno");
1393
1394         prepare_submodule_repo_env(&cp.env_array);
1395         cp.git_cmd = 1;
1396         cp.no_stdin = 1;
1397         cp.out = -1;
1398         cp.dir = path;
1399         if (start_command(&cp))
1400                 die("Could not run 'git status --porcelain=2' in submodule %s", path);
1401
1402         fp = xfdopen(cp.out, "r");
1403         while (strbuf_getwholeline(&buf, fp, '\n') != EOF) {
1404                 /* regular untracked files */
1405                 if (buf.buf[0] == '?')
1406                         dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
1407
1408                 if (buf.buf[0] == 'u' ||
1409                     buf.buf[0] == '1' ||
1410                     buf.buf[0] == '2') {
1411                         /* T = line type, XY = status, SSSS = submodule state */
1412                         if (buf.len < strlen("T XY SSSS"))
1413                                 BUG("invalid status --porcelain=2 line %s",
1414                                     buf.buf);
1415
1416                         if (buf.buf[5] == 'S' && buf.buf[8] == 'U')
1417                                 /* nested untracked file */
1418                                 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
1419
1420                         if (buf.buf[0] == 'u' ||
1421                             buf.buf[0] == '2' ||
1422                             memcmp(buf.buf + 5, "S..U", 4))
1423                                 /* other change */
1424                                 dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
1425                 }
1426
1427                 if ((dirty_submodule & DIRTY_SUBMODULE_MODIFIED) &&
1428                     ((dirty_submodule & DIRTY_SUBMODULE_UNTRACKED) ||
1429                      ignore_untracked)) {
1430                         /*
1431                          * We're not interested in any further information from
1432                          * the child any more, neither output nor its exit code.
1433                          */
1434                         ignore_cp_exit_code = 1;
1435                         break;
1436                 }
1437         }
1438         fclose(fp);
1439
1440         if (finish_command(&cp) && !ignore_cp_exit_code)
1441                 die("'git status --porcelain=2' failed in submodule %s", path);
1442
1443         strbuf_release(&buf);
1444         return dirty_submodule;
1445 }
1446
1447 int submodule_uses_gitfile(const char *path)
1448 {
1449         struct child_process cp = CHILD_PROCESS_INIT;
1450         const char *argv[] = {
1451                 "submodule",
1452                 "foreach",
1453                 "--quiet",
1454                 "--recursive",
1455                 "test -f .git",
1456                 NULL,
1457         };
1458         struct strbuf buf = STRBUF_INIT;
1459         const char *git_dir;
1460
1461         strbuf_addf(&buf, "%s/.git", path);
1462         git_dir = read_gitfile(buf.buf);
1463         if (!git_dir) {
1464                 strbuf_release(&buf);
1465                 return 0;
1466         }
1467         strbuf_release(&buf);
1468
1469         /* Now test that all nested submodules use a gitfile too */
1470         cp.argv = argv;
1471         prepare_submodule_repo_env(&cp.env_array);
1472         cp.git_cmd = 1;
1473         cp.no_stdin = 1;
1474         cp.no_stderr = 1;
1475         cp.no_stdout = 1;
1476         cp.dir = path;
1477         if (run_command(&cp))
1478                 return 0;
1479
1480         return 1;
1481 }
1482
1483 /*
1484  * Check if it is a bad idea to remove a submodule, i.e. if we'd lose data
1485  * when doing so.
1486  *
1487  * Return 1 if we'd lose data, return 0 if the removal is fine,
1488  * and negative values for errors.
1489  */
1490 int bad_to_remove_submodule(const char *path, unsigned flags)
1491 {
1492         ssize_t len;
1493         struct child_process cp = CHILD_PROCESS_INIT;
1494         struct strbuf buf = STRBUF_INIT;
1495         int ret = 0;
1496
1497         if (!file_exists(path) || is_empty_dir(path))
1498                 return 0;
1499
1500         if (!submodule_uses_gitfile(path))
1501                 return 1;
1502
1503         argv_array_pushl(&cp.args, "status", "--porcelain",
1504                                    "--ignore-submodules=none", NULL);
1505
1506         if (flags & SUBMODULE_REMOVAL_IGNORE_UNTRACKED)
1507                 argv_array_push(&cp.args, "-uno");
1508         else
1509                 argv_array_push(&cp.args, "-uall");
1510
1511         if (!(flags & SUBMODULE_REMOVAL_IGNORE_IGNORED_UNTRACKED))
1512                 argv_array_push(&cp.args, "--ignored");
1513
1514         prepare_submodule_repo_env(&cp.env_array);
1515         cp.git_cmd = 1;
1516         cp.no_stdin = 1;
1517         cp.out = -1;
1518         cp.dir = path;
1519         if (start_command(&cp)) {
1520                 if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
1521                         die(_("could not start 'git status' in submodule '%s'"),
1522                                 path);
1523                 ret = -1;
1524                 goto out;
1525         }
1526
1527         len = strbuf_read(&buf, cp.out, 1024);
1528         if (len > 2)
1529                 ret = 1;
1530         close(cp.out);
1531
1532         if (finish_command(&cp)) {
1533                 if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
1534                         die(_("could not run 'git status' in submodule '%s'"),
1535                                 path);
1536                 ret = -1;
1537         }
1538 out:
1539         strbuf_release(&buf);
1540         return ret;
1541 }
1542
1543 static const char *get_super_prefix_or_empty(void)
1544 {
1545         const char *s = get_super_prefix();
1546         if (!s)
1547                 s = "";
1548         return s;
1549 }
1550
1551 static int submodule_has_dirty_index(const struct submodule *sub)
1552 {
1553         struct child_process cp = CHILD_PROCESS_INIT;
1554
1555         prepare_submodule_repo_env(&cp.env_array);
1556
1557         cp.git_cmd = 1;
1558         argv_array_pushl(&cp.args, "diff-index", "--quiet",
1559                                    "--cached", "HEAD", NULL);
1560         cp.no_stdin = 1;
1561         cp.no_stdout = 1;
1562         cp.dir = sub->path;
1563         if (start_command(&cp))
1564                 die("could not recurse into submodule '%s'", sub->path);
1565
1566         return finish_command(&cp);
1567 }
1568
1569 static void submodule_reset_index(const char *path)
1570 {
1571         struct child_process cp = CHILD_PROCESS_INIT;
1572         prepare_submodule_repo_env(&cp.env_array);
1573
1574         cp.git_cmd = 1;
1575         cp.no_stdin = 1;
1576         cp.dir = path;
1577
1578         argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
1579                                    get_super_prefix_or_empty(), path);
1580         argv_array_pushl(&cp.args, "read-tree", "-u", "--reset", NULL);
1581
1582         argv_array_push(&cp.args, empty_tree_oid_hex());
1583
1584         if (run_command(&cp))
1585                 die("could not reset submodule index");
1586 }
1587
1588 /**
1589  * Moves a submodule at a given path from a given head to another new head.
1590  * For edge cases (a submodule coming into existence or removing a submodule)
1591  * pass NULL for old or new respectively.
1592  */
1593 int submodule_move_head(const char *path,
1594                          const char *old_head,
1595                          const char *new_head,
1596                          unsigned flags)
1597 {
1598         int ret = 0;
1599         struct child_process cp = CHILD_PROCESS_INIT;
1600         const struct submodule *sub;
1601         int *error_code_ptr, error_code;
1602
1603         if (!is_submodule_active(the_repository, path))
1604                 return 0;
1605
1606         if (flags & SUBMODULE_MOVE_HEAD_FORCE)
1607                 /*
1608                  * Pass non NULL pointer to is_submodule_populated_gently
1609                  * to prevent die()-ing. We'll use connect_work_tree_and_git_dir
1610                  * to fixup the submodule in the force case later.
1611                  */
1612                 error_code_ptr = &error_code;
1613         else
1614                 error_code_ptr = NULL;
1615
1616         if (old_head && !is_submodule_populated_gently(path, error_code_ptr))
1617                 return 0;
1618
1619         sub = submodule_from_path(the_repository, &null_oid, path);
1620
1621         if (!sub)
1622                 BUG("could not get submodule information for '%s'", path);
1623
1624         if (old_head && !(flags & SUBMODULE_MOVE_HEAD_FORCE)) {
1625                 /* Check if the submodule has a dirty index. */
1626                 if (submodule_has_dirty_index(sub))
1627                         return error(_("submodule '%s' has dirty index"), path);
1628         }
1629
1630         if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
1631                 if (old_head) {
1632                         if (!submodule_uses_gitfile(path))
1633                                 absorb_git_dir_into_superproject("", path,
1634                                         ABSORB_GITDIR_RECURSE_SUBMODULES);
1635                 } else {
1636                         char *gitdir = xstrfmt("%s/modules/%s",
1637                                     get_git_common_dir(), sub->name);
1638                         connect_work_tree_and_git_dir(path, gitdir, 0);
1639                         free(gitdir);
1640
1641                         /* make sure the index is clean as well */
1642                         submodule_reset_index(path);
1643                 }
1644
1645                 if (old_head && (flags & SUBMODULE_MOVE_HEAD_FORCE)) {
1646                         char *gitdir = xstrfmt("%s/modules/%s",
1647                                     get_git_common_dir(), sub->name);
1648                         connect_work_tree_and_git_dir(path, gitdir, 1);
1649                         free(gitdir);
1650                 }
1651         }
1652
1653         prepare_submodule_repo_env(&cp.env_array);
1654
1655         cp.git_cmd = 1;
1656         cp.no_stdin = 1;
1657         cp.dir = path;
1658
1659         argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
1660                         get_super_prefix_or_empty(), path);
1661         argv_array_pushl(&cp.args, "read-tree", "--recurse-submodules", NULL);
1662
1663         if (flags & SUBMODULE_MOVE_HEAD_DRY_RUN)
1664                 argv_array_push(&cp.args, "-n");
1665         else
1666                 argv_array_push(&cp.args, "-u");
1667
1668         if (flags & SUBMODULE_MOVE_HEAD_FORCE)
1669                 argv_array_push(&cp.args, "--reset");
1670         else
1671                 argv_array_push(&cp.args, "-m");
1672
1673         if (!(flags & SUBMODULE_MOVE_HEAD_FORCE))
1674                 argv_array_push(&cp.args, old_head ? old_head : empty_tree_oid_hex());
1675
1676         argv_array_push(&cp.args, new_head ? new_head : empty_tree_oid_hex());
1677
1678         if (run_command(&cp)) {
1679                 ret = error(_("Submodule '%s' could not be updated."), path);
1680                 goto out;
1681         }
1682
1683         if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
1684                 if (new_head) {
1685                         child_process_init(&cp);
1686                         /* also set the HEAD accordingly */
1687                         cp.git_cmd = 1;
1688                         cp.no_stdin = 1;
1689                         cp.dir = path;
1690
1691                         prepare_submodule_repo_env(&cp.env_array);
1692                         argv_array_pushl(&cp.args, "update-ref", "HEAD",
1693                                          "--no-deref", new_head, NULL);
1694
1695                         if (run_command(&cp)) {
1696                                 ret = -1;
1697                                 goto out;
1698                         }
1699                 } else {
1700                         struct strbuf sb = STRBUF_INIT;
1701
1702                         strbuf_addf(&sb, "%s/.git", path);
1703                         unlink_or_warn(sb.buf);
1704                         strbuf_release(&sb);
1705
1706                         if (is_empty_dir(path))
1707                                 rmdir_or_warn(path);
1708                 }
1709         }
1710 out:
1711         return ret;
1712 }
1713
1714 /*
1715  * Embeds a single submodules git directory into the superprojects git dir,
1716  * non recursively.
1717  */
1718 static void relocate_single_git_dir_into_superproject(const char *prefix,
1719                                                       const char *path)
1720 {
1721         char *old_git_dir = NULL, *real_old_git_dir = NULL, *real_new_git_dir = NULL;
1722         const char *new_git_dir;
1723         const struct submodule *sub;
1724
1725         if (submodule_uses_worktrees(path))
1726                 die(_("relocate_gitdir for submodule '%s' with "
1727                       "more than one worktree not supported"), path);
1728
1729         old_git_dir = xstrfmt("%s/.git", path);
1730         if (read_gitfile(old_git_dir))
1731                 /* If it is an actual gitfile, it doesn't need migration. */
1732                 return;
1733
1734         real_old_git_dir = real_pathdup(old_git_dir, 1);
1735
1736         sub = submodule_from_path(the_repository, &null_oid, path);
1737         if (!sub)
1738                 die(_("could not lookup name for submodule '%s'"), path);
1739
1740         new_git_dir = git_path("modules/%s", sub->name);
1741         if (safe_create_leading_directories_const(new_git_dir) < 0)
1742                 die(_("could not create directory '%s'"), new_git_dir);
1743         real_new_git_dir = real_pathdup(new_git_dir, 1);
1744
1745         fprintf(stderr, _("Migrating git directory of '%s%s' from\n'%s' to\n'%s'\n"),
1746                 get_super_prefix_or_empty(), path,
1747                 real_old_git_dir, real_new_git_dir);
1748
1749         relocate_gitdir(path, real_old_git_dir, real_new_git_dir);
1750
1751         free(old_git_dir);
1752         free(real_old_git_dir);
1753         free(real_new_git_dir);
1754 }
1755
1756 /*
1757  * Migrate the git directory of the submodule given by path from
1758  * having its git directory within the working tree to the git dir nested
1759  * in its superprojects git dir under modules/.
1760  */
1761 void absorb_git_dir_into_superproject(const char *prefix,
1762                                       const char *path,
1763                                       unsigned flags)
1764 {
1765         int err_code;
1766         const char *sub_git_dir;
1767         struct strbuf gitdir = STRBUF_INIT;
1768         strbuf_addf(&gitdir, "%s/.git", path);
1769         sub_git_dir = resolve_gitdir_gently(gitdir.buf, &err_code);
1770
1771         /* Not populated? */
1772         if (!sub_git_dir) {
1773                 const struct submodule *sub;
1774
1775                 if (err_code == READ_GITFILE_ERR_STAT_FAILED) {
1776                         /* unpopulated as expected */
1777                         strbuf_release(&gitdir);
1778                         return;
1779                 }
1780
1781                 if (err_code != READ_GITFILE_ERR_NOT_A_REPO)
1782                         /* We don't know what broke here. */
1783                         read_gitfile_error_die(err_code, path, NULL);
1784
1785                 /*
1786                 * Maybe populated, but no git directory was found?
1787                 * This can happen if the superproject is a submodule
1788                 * itself and was just absorbed. The absorption of the
1789                 * superproject did not rewrite the git file links yet,
1790                 * fix it now.
1791                 */
1792                 sub = submodule_from_path(the_repository, &null_oid, path);
1793                 if (!sub)
1794                         die(_("could not lookup name for submodule '%s'"), path);
1795                 connect_work_tree_and_git_dir(path,
1796                         git_path("modules/%s", sub->name), 0);
1797         } else {
1798                 /* Is it already absorbed into the superprojects git dir? */
1799                 char *real_sub_git_dir = real_pathdup(sub_git_dir, 1);
1800                 char *real_common_git_dir = real_pathdup(get_git_common_dir(), 1);
1801
1802                 if (!starts_with(real_sub_git_dir, real_common_git_dir))
1803                         relocate_single_git_dir_into_superproject(prefix, path);
1804
1805                 free(real_sub_git_dir);
1806                 free(real_common_git_dir);
1807         }
1808         strbuf_release(&gitdir);
1809
1810         if (flags & ABSORB_GITDIR_RECURSE_SUBMODULES) {
1811                 struct child_process cp = CHILD_PROCESS_INIT;
1812                 struct strbuf sb = STRBUF_INIT;
1813
1814                 if (flags & ~ABSORB_GITDIR_RECURSE_SUBMODULES)
1815                         BUG("we don't know how to pass the flags down?");
1816
1817                 strbuf_addstr(&sb, get_super_prefix_or_empty());
1818                 strbuf_addstr(&sb, path);
1819                 strbuf_addch(&sb, '/');
1820
1821                 cp.dir = path;
1822                 cp.git_cmd = 1;
1823                 cp.no_stdin = 1;
1824                 argv_array_pushl(&cp.args, "--super-prefix", sb.buf,
1825                                            "submodule--helper",
1826                                            "absorb-git-dirs", NULL);
1827                 prepare_submodule_repo_env(&cp.env_array);
1828                 if (run_command(&cp))
1829                         die(_("could not recurse into submodule '%s'"), path);
1830
1831                 strbuf_release(&sb);
1832         }
1833 }
1834
1835 const char *get_superproject_working_tree(void)
1836 {
1837         struct child_process cp = CHILD_PROCESS_INIT;
1838         struct strbuf sb = STRBUF_INIT;
1839         const char *one_up = real_path_if_valid("../");
1840         const char *cwd = xgetcwd();
1841         const char *ret = NULL;
1842         const char *subpath;
1843         int code;
1844         ssize_t len;
1845
1846         if (!is_inside_work_tree())
1847                 /*
1848                  * FIXME:
1849                  * We might have a superproject, but it is harder
1850                  * to determine.
1851                  */
1852                 return NULL;
1853
1854         if (!one_up)
1855                 return NULL;
1856
1857         subpath = relative_path(cwd, one_up, &sb);
1858
1859         prepare_submodule_repo_env(&cp.env_array);
1860         argv_array_pop(&cp.env_array);
1861
1862         argv_array_pushl(&cp.args, "--literal-pathspecs", "-C", "..",
1863                         "ls-files", "-z", "--stage", "--full-name", "--",
1864                         subpath, NULL);
1865         strbuf_reset(&sb);
1866
1867         cp.no_stdin = 1;
1868         cp.no_stderr = 1;
1869         cp.out = -1;
1870         cp.git_cmd = 1;
1871
1872         if (start_command(&cp))
1873                 die(_("could not start ls-files in .."));
1874
1875         len = strbuf_read(&sb, cp.out, PATH_MAX);
1876         close(cp.out);
1877
1878         if (starts_with(sb.buf, "160000")) {
1879                 int super_sub_len;
1880                 int cwd_len = strlen(cwd);
1881                 char *super_sub, *super_wt;
1882
1883                 /*
1884                  * There is a superproject having this repo as a submodule.
1885                  * The format is <mode> SP <hash> SP <stage> TAB <full name> \0,
1886                  * We're only interested in the name after the tab.
1887                  */
1888                 super_sub = strchr(sb.buf, '\t') + 1;
1889                 super_sub_len = strlen(super_sub);
1890
1891                 if (super_sub_len > cwd_len ||
1892                     strcmp(&cwd[cwd_len - super_sub_len], super_sub))
1893                         BUG("returned path string doesn't match cwd?");
1894
1895                 super_wt = xstrdup(cwd);
1896                 super_wt[cwd_len - super_sub_len] = '\0';
1897
1898                 ret = real_path(super_wt);
1899                 free(super_wt);
1900         }
1901         strbuf_release(&sb);
1902
1903         code = finish_command(&cp);
1904
1905         if (code == 128)
1906                 /* '../' is not a git repository */
1907                 return NULL;
1908         if (code == 0 && len == 0)
1909                 /* There is an unrelated git repository at '../' */
1910                 return NULL;
1911         if (code)
1912                 die(_("ls-tree returned unexpected return code %d"), code);
1913
1914         return ret;
1915 }
1916
1917 /*
1918  * Put the gitdir for a submodule (given relative to the main
1919  * repository worktree) into `buf`, or return -1 on error.
1920  */
1921 int submodule_to_gitdir(struct strbuf *buf, const char *submodule)
1922 {
1923         const struct submodule *sub;
1924         const char *git_dir;
1925         int ret = 0;
1926
1927         strbuf_reset(buf);
1928         strbuf_addstr(buf, submodule);
1929         strbuf_complete(buf, '/');
1930         strbuf_addstr(buf, ".git");
1931
1932         git_dir = read_gitfile(buf->buf);
1933         if (git_dir) {
1934                 strbuf_reset(buf);
1935                 strbuf_addstr(buf, git_dir);
1936         }
1937         if (!is_git_directory(buf->buf)) {
1938                 sub = submodule_from_path(the_repository, &null_oid, submodule);
1939                 if (!sub) {
1940                         ret = -1;
1941                         goto cleanup;
1942                 }
1943                 strbuf_reset(buf);
1944                 strbuf_git_path(buf, "%s/%s", "modules", sub->name);
1945         }
1946
1947 cleanup:
1948         return ret;
1949 }