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

   1 #include "cache.h"
   2 #include "submodule-config.h"
   3 #include "submodule.h"
   4 #include "dir.h"
   5 #include "diff.h"
   6 #include "commit.h"
   7 #include "revision.h"
   8 #include "run-command.h"
   9 #include "diffcore.h"
  10 #include "refs.h"
  11 #include "string-list.h"
  12 #include "sha1-array.h"
  13 #include "argv-array.h"
  14 #include "blob.h"
  15 #include "thread-utils.h"
  16 #include "quote.h"
  17
  18 static int config_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND;
  19 static int parallel_jobs = 1;
  20 static struct string_list changed_submodule_paths = STRING_LIST_INIT_NODUP;
  21 static int initialized_fetch_ref_tips;
  22 static struct sha1_array ref_tips_before_fetch;
  23 static struct sha1_array ref_tips_after_fetch;
  24
  25 /*
  26  * The following flag is set if the .gitmodules file is unmerged. We then
  27  * disable recursion for all submodules where .git/config doesn't have a
  28  * matching config entry because we can't guess what might be configured in
  29  * .gitmodules unless the user resolves the conflict. When a command line
  30  * option is given (which always overrides configuration) this flag will be
  31  * ignored.
  32  */
  33 static int gitmodules_is_unmerged;
  34
  35 /*
  36  * This flag is set if the .gitmodules file had unstaged modifications on
  37  * startup. This must be checked before allowing modifications to the
  38  * .gitmodules file with the intention to stage them later, because when
  39  * continuing we would stage the modifications the user didn't stage herself
  40  * too. That might change in a future version when we learn to stage the
  41  * changes we do ourselves without staging any previous modifications.
  42  */
  43 static int gitmodules_is_modified;
  44
  45 int is_staging_gitmodules_ok(void)
  46 {
  47         return !gitmodules_is_modified;
  48 }
  49
  50 /*
  51  * Try to update the "path" entry in the "submodule.<name>" section of the
  52  * .gitmodules file. Return 0 only if a .gitmodules file was found, a section
  53  * with the correct path=<oldpath> setting was found and we could update it.
  54  */
  55 int update_path_in_gitmodules(const char *oldpath, const char *newpath)
  56 {
  57         struct strbuf entry = STRBUF_INIT;
  58         const struct submodule *submodule;
  59
  60         if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
  61                 return -1;
  62
  63         if (gitmodules_is_unmerged)
  64                 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
  65
  66         submodule = submodule_from_path(null_sha1, oldpath);
  67         if (!submodule || !submodule->name) {
  68                 warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
  69                 return -1;
  70         }
  71         strbuf_addstr(&entry, "submodule.");
  72         strbuf_addstr(&entry, submodule->name);
  73         strbuf_addstr(&entry, ".path");
  74         if (git_config_set_in_file_gently(".gitmodules", entry.buf, newpath) < 0) {
  75                 /* Maybe the user already did that, don't error out here */
  76                 warning(_("Could not update .gitmodules entry %s"), entry.buf);
  77                 strbuf_release(&entry);
  78                 return -1;
  79         }
  80         strbuf_release(&entry);
  81         return 0;
  82 }
  83
  84 /*
  85  * Try to remove the "submodule.<name>" section from .gitmodules where the given
  86  * path is configured. Return 0 only if a .gitmodules file was found, a section
  87  * with the correct path=<path> setting was found and we could remove it.
  88  */
  89 int remove_path_from_gitmodules(const char *path)
  90 {
  91         struct strbuf sect = STRBUF_INIT;
  92         const struct submodule *submodule;
  93
  94         if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
  95                 return -1;
  96
  97         if (gitmodules_is_unmerged)
  98                 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
  99
 100         submodule = submodule_from_path(null_sha1, path);
 101         if (!submodule || !submodule->name) {
 102                 warning(_("Could not find section in .gitmodules where path=%s"), path);
 103                 return -1;
 104         }
 105         strbuf_addstr(&sect, "submodule.");
 106         strbuf_addstr(&sect, submodule->name);
 107         if (git_config_rename_section_in_file(".gitmodules", sect.buf, NULL) < 0) {
 108                 /* Maybe the user already did that, don't error out here */
 109                 warning(_("Could not remove .gitmodules entry for %s"), path);
 110                 strbuf_release(&sect);
 111                 return -1;
 112         }
 113         strbuf_release(&sect);
 114         return 0;
 115 }
 116
 117 void stage_updated_gitmodules(void)
 118 {
 119         if (add_file_to_cache(".gitmodules", 0))
 120                 die(_("staging updated .gitmodules failed"));
 121 }
 122
 123 static int add_submodule_odb(const char *path)
 124 {
 125         struct strbuf objects_directory = STRBUF_INIT;
 126         struct alternate_object_database *alt_odb;
 127         int ret = 0;
 128         size_t alloc;
 129
 130         ret = strbuf_git_path_submodule(&objects_directory, path, "objects/");
 131         if (ret)
 132                 goto done;
 133         if (!is_directory(objects_directory.buf)) {
 134                 ret = -1;
 135                 goto done;
 136         }
 137         /* avoid adding it twice */
 138         prepare_alt_odb();
 139         for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
 140                 if (alt_odb->name - alt_odb->base == objects_directory.len &&
 141                                 !strncmp(alt_odb->base, objects_directory.buf,
 142                                         objects_directory.len))
 143                         goto done;
 144
 145         alloc = st_add(objects_directory.len, 42); /* for "12/345..." sha1 */
 146         alt_odb = xmalloc(st_add(sizeof(*alt_odb), alloc));
 147         alt_odb->next = alt_odb_list;
 148         xsnprintf(alt_odb->base, alloc, "%s", objects_directory.buf);
 149         alt_odb->name = alt_odb->base + objects_directory.len;
 150         alt_odb->name[2] = '/';
 151         alt_odb->name[40] = '\0';
 152         alt_odb->name[41] = '\0';
 153         alt_odb_list = alt_odb;
 154
 155         /* add possible alternates from the submodule */
 156         read_info_alternates(objects_directory.buf, 0);
 157 done:
 158         strbuf_release(&objects_directory);
 159         return ret;
 160 }
 161
 162 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
 163                                              const char *path)
 164 {
 165         const struct submodule *submodule = submodule_from_path(null_sha1, path);
 166         if (submodule) {
 167                 if (submodule->ignore)
 168                         handle_ignore_submodules_arg(diffopt, submodule->ignore);
 169                 else if (gitmodules_is_unmerged)
 170                         DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 171         }
 172 }
 173
 174 int submodule_config(const char *var, const char *value, void *cb)
 175 {
 176         if (!strcmp(var, "submodule.fetchjobs")) {
 177                 parallel_jobs = git_config_int(var, value);
 178                 if (parallel_jobs < 0)
 179                         die(_("negative values not allowed for submodule.fetchJobs"));
 180                 return 0;
 181         } else if (starts_with(var, "submodule."))
 182                 return parse_submodule_config_option(var, value);
 183         else if (!strcmp(var, "fetch.recursesubmodules")) {
 184                 config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
 185                 return 0;
 186         }
 187         return 0;
 188 }
 189
 190 void gitmodules_config(void)
 191 {
 192         const char *work_tree = get_git_work_tree();
 193         if (work_tree) {
 194                 struct strbuf gitmodules_path = STRBUF_INIT;
 195                 int pos;
 196                 strbuf_addstr(&gitmodules_path, work_tree);
 197                 strbuf_addstr(&gitmodules_path, "/.gitmodules");
 198                 if (read_cache() < 0)
 199                         die("index file corrupt");
 200                 pos = cache_name_pos(".gitmodules", 11);
 201                 if (pos < 0) { /* .gitmodules not found or isn't merged */
 202                         pos = -1 - pos;
 203                         if (active_nr > pos) {  /* there is a .gitmodules */
 204                                 const struct cache_entry *ce = active_cache[pos];
 205                                 if (ce_namelen(ce) == 11 &&
 206                                     !memcmp(ce->name, ".gitmodules", 11))
 207                                         gitmodules_is_unmerged = 1;
 208                         }
 209                 } else if (pos < active_nr) {
 210                         struct stat st;
 211                         if (lstat(".gitmodules", &st) == 0 &&
 212                             ce_match_stat(active_cache[pos], &st, 0) & DATA_CHANGED)
 213                                 gitmodules_is_modified = 1;
 214                 }
 215
 216                 if (!gitmodules_is_unmerged)
 217                         git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
 218                 strbuf_release(&gitmodules_path);
 219         }
 220 }
 221
 222 int parse_submodule_update_strategy(const char *value,
 223                 struct submodule_update_strategy *dst)
 224 {
 225         free((void*)dst->command);
 226         dst->command = NULL;
 227         if (!strcmp(value, "none"))
 228                 dst->type = SM_UPDATE_NONE;
 229         else if (!strcmp(value, "checkout"))
 230                 dst->type = SM_UPDATE_CHECKOUT;
 231         else if (!strcmp(value, "rebase"))
 232                 dst->type = SM_UPDATE_REBASE;
 233         else if (!strcmp(value, "merge"))
 234                 dst->type = SM_UPDATE_MERGE;
 235         else if (skip_prefix(value, "!", &value)) {
 236                 dst->type = SM_UPDATE_COMMAND;
 237                 dst->command = xstrdup(value);
 238         } else
 239                 return -1;
 240         return 0;
 241 }
 242
 243 const char *submodule_strategy_to_string(const struct submodule_update_strategy *s)
 244 {
 245         struct strbuf sb = STRBUF_INIT;
 246         switch (s->type) {
 247         case SM_UPDATE_CHECKOUT:
 248                 return "checkout";
 249         case SM_UPDATE_MERGE:
 250                 return "merge";
 251         case SM_UPDATE_REBASE:
 252                 return "rebase";
 253         case SM_UPDATE_NONE:
 254                 return "none";
 255         case SM_UPDATE_UNSPECIFIED:
 256                 return NULL;
 257         case SM_UPDATE_COMMAND:
 258                 strbuf_addf(&sb, "!%s", s->command);
 259                 return strbuf_detach(&sb, NULL);
 260         }
 261         return NULL;
 262 }
 263
 264 void handle_ignore_submodules_arg(struct diff_options *diffopt,
 265                                   const char *arg)
 266 {
 267         DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
 268         DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 269         DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
 270
 271         if (!strcmp(arg, "all"))
 272                 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 273         else if (!strcmp(arg, "untracked"))
 274                 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 275         else if (!strcmp(arg, "dirty"))
 276                 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
 277         else if (strcmp(arg, "none"))
 278                 die("bad --ignore-submodules argument: %s", arg);
 279 }
 280
 281 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
 282                 struct commit *left, struct commit *right,
 283                 struct commit_list *merge_bases)
 284 {
 285         struct commit_list *list;
 286
 287         init_revisions(rev, NULL);
 288         setup_revisions(0, NULL, rev, NULL);
 289         rev->left_right = 1;
 290         rev->first_parent_only = 1;
 291         left->object.flags |= SYMMETRIC_LEFT;
 292         add_pending_object(rev, &left->object, path);
 293         add_pending_object(rev, &right->object, path);
 294         for (list = merge_bases; list; list = list->next) {
 295                 list->item->object.flags |= UNINTERESTING;
 296                 add_pending_object(rev, &list->item->object,
 297                         oid_to_hex(&list->item->object.oid));
 298         }
 299         return prepare_revision_walk(rev);
 300 }
 301
 302 static void print_submodule_summary(struct rev_info *rev, FILE *f,
 303                 const char *line_prefix,
 304                 const char *del, const char *add, const char *reset)
 305 {
 306         static const char format[] = "  %m %s";
 307         struct strbuf sb = STRBUF_INIT;
 308         struct commit *commit;
 309
 310         while ((commit = get_revision(rev))) {
 311                 struct pretty_print_context ctx = {0};
 312                 ctx.date_mode = rev->date_mode;
 313                 ctx.output_encoding = get_log_output_encoding();
 314                 strbuf_setlen(&sb, 0);
 315                 strbuf_addstr(&sb, line_prefix);
 316                 if (commit->object.flags & SYMMETRIC_LEFT) {
 317                         if (del)
 318                                 strbuf_addstr(&sb, del);
 319                 }
 320                 else if (add)
 321                         strbuf_addstr(&sb, add);
 322                 format_commit_message(commit, format, &sb, &ctx);
 323                 if (reset)
 324                         strbuf_addstr(&sb, reset);
 325                 strbuf_addch(&sb, '\n');
 326                 fprintf(f, "%s", sb.buf);
 327         }
 328         strbuf_release(&sb);
 329 }
 330
 331 /* Helper function to display the submodule header line prior to the full
 332  * summary output. If it can locate the submodule objects directory it will
 333  * attempt to lookup both the left and right commits and put them into the
 334  * left and right pointers.
 335  */
 336 static void show_submodule_header(FILE *f, const char *path,
 337                 const char *line_prefix,
 338                 struct object_id *one, struct object_id *two,
 339                 unsigned dirty_submodule, const char *meta,
 340                 const char *reset,
 341                 struct commit **left, struct commit **right,
 342                 struct commit_list **merge_bases)
 343 {
 344         const char *message = NULL;
 345         struct strbuf sb = STRBUF_INIT;
 346         int fast_forward = 0, fast_backward = 0;
 347
 348         if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
 349                 fprintf(f, "%sSubmodule %s contains untracked content\n",
 350                         line_prefix, path);
 351         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 352                 fprintf(f, "%sSubmodule %s contains modified content\n",
 353                         line_prefix, path);
 354
 355         if (is_null_oid(one))
 356                 message = "(new submodule)";
 357         else if (is_null_oid(two))
 358                 message = "(submodule deleted)";
 359
 360         if (add_submodule_odb(path)) {
 361                 if (!message)
 362                         message = "(not initialized)";
 363                 goto output_header;
 364         }
 365
 366         /*
 367          * Attempt to lookup the commit references, and determine if this is
 368          * a fast forward or fast backwards update.
 369          */
 370         *left = lookup_commit_reference(one->hash);
 371         *right = lookup_commit_reference(two->hash);
 372
 373         /*
 374          * Warn about missing commits in the submodule project, but only if
 375          * they aren't null.
 376          */
 377         if ((!is_null_oid(one) && !*left) ||
 378              (!is_null_oid(two) && !*right))
 379                 message = "(commits not present)";
 380
 381         *merge_bases = get_merge_bases(*left, *right);
 382         if (*merge_bases) {
 383                 if ((*merge_bases)->item == *left)
 384                         fast_forward = 1;
 385                 else if ((*merge_bases)->item == *right)
 386                         fast_backward = 1;
 387         }
 388
 389         if (!oidcmp(one, two)) {
 390                 strbuf_release(&sb);
 391                 return;
 392         }
 393
 394 output_header:
 395         strbuf_addf(&sb, "%s%sSubmodule %s %s..", line_prefix, meta, path,
 396                         find_unique_abbrev(one->hash, DEFAULT_ABBREV));
 397         if (!fast_backward && !fast_forward)
 398                 strbuf_addch(&sb, '.');
 399         strbuf_addf(&sb, "%s", find_unique_abbrev(two->hash, DEFAULT_ABBREV));
 400         if (message)
 401                 strbuf_addf(&sb, " %s%s\n", message, reset);
 402         else
 403                 strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
 404         fwrite(sb.buf, sb.len, 1, f);
 405
 406         strbuf_release(&sb);
 407 }
 408
 409 void show_submodule_summary(FILE *f, const char *path,
 410                 const char *line_prefix,
 411                 struct object_id *one, struct object_id *two,
 412                 unsigned dirty_submodule, const char *meta,
 413                 const char *del, const char *add, const char *reset)
 414 {
 415         struct rev_info rev;
 416         struct commit *left = NULL, *right = NULL;
 417         struct commit_list *merge_bases = NULL;
 418
 419         show_submodule_header(f, path, line_prefix, one, two, dirty_submodule,
 420                               meta, reset, &left, &right, &merge_bases);
 421
 422         /*
 423          * If we don't have both a left and a right pointer, there is no
 424          * reason to try and display a summary. The header line should contain
 425          * all the information the user needs.
 426          */
 427         if (!left || !right)
 428                 goto out;
 429
 430         /* Treat revision walker failure the same as missing commits */
 431         if (prepare_submodule_summary(&rev, path, left, right, merge_bases)) {
 432                 fprintf(f, "%s(revision walker failed)\n", line_prefix);
 433                 goto out;
 434         }
 435
 436         print_submodule_summary(&rev, f, line_prefix, del, add, reset);
 437
 438 out:
 439         if (merge_bases)
 440                 free_commit_list(merge_bases);
 441         clear_commit_marks(left, ~0);
 442         clear_commit_marks(right, ~0);
 443 }
 444
 445 void show_submodule_inline_diff(FILE *f, const char *path,
 446                 const char *line_prefix,
 447                 struct object_id *one, struct object_id *two,
 448                 unsigned dirty_submodule, const char *meta,
 449                 const char *del, const char *add, const char *reset,
 450                 const struct diff_options *o)
 451 {
 452         const struct object_id *old = &empty_tree_oid, *new = &empty_tree_oid;
 453         struct commit *left = NULL, *right = NULL;
 454         struct commit_list *merge_bases = NULL;
 455         struct strbuf submodule_dir = STRBUF_INIT;
 456         struct child_process cp = CHILD_PROCESS_INIT;
 457
 458         show_submodule_header(f, path, line_prefix, one, two, dirty_submodule,
 459                               meta, reset, &left, &right, &merge_bases);
 460
 461         /* We need a valid left and right commit to display a difference */
 462         if (!(left || is_null_oid(one)) ||
 463             !(right || is_null_oid(two)))
 464                 goto done;
 465
 466         if (left)
 467                 old = one;
 468         if (right)
 469                 new = two;
 470
 471         fflush(f);
 472         cp.git_cmd = 1;
 473         cp.dir = path;
 474         cp.out = dup(fileno(f));
 475         cp.no_stdin = 1;
 476
 477         /* TODO: other options may need to be passed here. */
 478         argv_array_push(&cp.args, "diff");
 479         argv_array_pushf(&cp.args, "--line-prefix=%s", line_prefix);
 480         if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
 481                 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
 482                                  o->b_prefix, path);
 483                 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
 484                                  o->a_prefix, path);
 485         } else {
 486                 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
 487                                  o->a_prefix, path);
 488                 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
 489                                  o->b_prefix, path);
 490         }
 491         argv_array_push(&cp.args, oid_to_hex(old));
 492         /*
 493          * If the submodule has modified content, we will diff against the
 494          * work tree, under the assumption that the user has asked for the
 495          * diff format and wishes to actually see all differences even if they
 496          * haven't yet been committed to the submodule yet.
 497          */
 498         if (!(dirty_submodule & DIRTY_SUBMODULE_MODIFIED))
 499                 argv_array_push(&cp.args, oid_to_hex(new));
 500
 501         if (run_command(&cp))
 502                 fprintf(f, "(diff failed)\n");
 503
 504 done:
 505         strbuf_release(&submodule_dir);
 506         if (merge_bases)
 507                 free_commit_list(merge_bases);
 508         if (left)
 509                 clear_commit_marks(left, ~0);
 510         if (right)
 511                 clear_commit_marks(right, ~0);
 512 }
 513
 514 void set_config_fetch_recurse_submodules(int value)
 515 {
 516         config_fetch_recurse_submodules = value;
 517 }
 518
 519 static int has_remote(const char *refname, const struct object_id *oid,
 520                       int flags, void *cb_data)
 521 {
 522         return 1;
 523 }
 524
 525 static int submodule_needs_pushing(const char *path, const unsigned char sha1[20])
 526 {
 527         if (add_submodule_odb(path) || !lookup_commit_reference(sha1))
 528                 return 0;
 529
 530         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 531                 struct child_process cp = CHILD_PROCESS_INIT;
 532                 const char *argv[] = {"rev-list", NULL, "--not", "--remotes", "-n", "1" , NULL};
 533                 struct strbuf buf = STRBUF_INIT;
 534                 int needs_pushing = 0;
 535
 536                 argv[1] = sha1_to_hex(sha1);
 537                 cp.argv = argv;
 538                 prepare_submodule_repo_env(&cp.env_array);
 539                 cp.git_cmd = 1;
 540                 cp.no_stdin = 1;
 541                 cp.out = -1;
 542                 cp.dir = path;
 543                 if (start_command(&cp))
 544                         die("Could not run 'git rev-list %s --not --remotes -n 1' command in submodule %s",
 545                                 sha1_to_hex(sha1), path);
 546                 if (strbuf_read(&buf, cp.out, 41))
 547                         needs_pushing = 1;
 548                 finish_command(&cp);
 549                 close(cp.out);
 550                 strbuf_release(&buf);
 551                 return needs_pushing;
 552         }
 553
 554         return 0;
 555 }
 556
 557 static void collect_submodules_from_diff(struct diff_queue_struct *q,
 558                                          struct diff_options *options,
 559                                          void *data)
 560 {
 561         int i;
 562         struct string_list *needs_pushing = data;
 563
 564         for (i = 0; i < q->nr; i++) {
 565                 struct diff_filepair *p = q->queue[i];
 566                 if (!S_ISGITLINK(p->two->mode))
 567                         continue;
 568                 if (submodule_needs_pushing(p->two->path, p->two->oid.hash))
 569                         string_list_insert(needs_pushing, p->two->path);
 570         }
 571 }
 572
 573 static void find_unpushed_submodule_commits(struct commit *commit,
 574                 struct string_list *needs_pushing)
 575 {
 576         struct rev_info rev;
 577
 578         init_revisions(&rev, NULL);
 579         rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
 580         rev.diffopt.format_callback = collect_submodules_from_diff;
 581         rev.diffopt.format_callback_data = needs_pushing;
 582         diff_tree_combined_merge(commit, 1, &rev);
 583 }
 584
 585 int find_unpushed_submodules(unsigned char new_sha1[20],
 586                 const char *remotes_name, struct string_list *needs_pushing)
 587 {
 588         struct rev_info rev;
 589         struct commit *commit;
 590         const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
 591         int argc = ARRAY_SIZE(argv) - 1;
 592         char *sha1_copy;
 593
 594         struct strbuf remotes_arg = STRBUF_INIT;
 595
 596         strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
 597         init_revisions(&rev, NULL);
 598         sha1_copy = xstrdup(sha1_to_hex(new_sha1));
 599         argv[1] = sha1_copy;
 600         argv[3] = remotes_arg.buf;
 601         setup_revisions(argc, argv, &rev, NULL);
 602         if (prepare_revision_walk(&rev))
 603                 die("revision walk setup failed");
 604
 605         while ((commit = get_revision(&rev)) != NULL)
 606                 find_unpushed_submodule_commits(commit, needs_pushing);
 607
 608         reset_revision_walk();
 609         free(sha1_copy);
 610         strbuf_release(&remotes_arg);
 611
 612         return needs_pushing->nr;
 613 }
 614
 615 static int push_submodule(const char *path)
 616 {
 617         if (add_submodule_odb(path))
 618                 return 1;
 619
 620         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 621                 struct child_process cp = CHILD_PROCESS_INIT;
 622                 const char *argv[] = {"push", NULL};
 623
 624                 cp.argv = argv;
 625                 prepare_submodule_repo_env(&cp.env_array);
 626                 cp.git_cmd = 1;
 627                 cp.no_stdin = 1;
 628                 cp.dir = path;
 629                 if (run_command(&cp))
 630                         return 0;
 631                 close(cp.out);
 632         }
 633
 634         return 1;
 635 }
 636
 637 int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name)
 638 {
 639         int i, ret = 1;
 640         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 641
 642         if (!find_unpushed_submodules(new_sha1, remotes_name, &needs_pushing))
 643                 return 1;
 644
 645         for (i = 0; i < needs_pushing.nr; i++) {
 646                 const char *path = needs_pushing.items[i].string;
 647                 fprintf(stderr, "Pushing submodule '%s'\n", path);
 648                 if (!push_submodule(path)) {
 649                         fprintf(stderr, "Unable to push submodule '%s'\n", path);
 650                         ret = 0;
 651                 }
 652         }
 653
 654         string_list_clear(&needs_pushing, 0);
 655
 656         return ret;
 657 }
 658
 659 static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
 660 {
 661         int is_present = 0;
 662         if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
 663                 /* Even if the submodule is checked out and the commit is
 664                  * present, make sure it is reachable from a ref. */
 665                 struct child_process cp = CHILD_PROCESS_INIT;
 666                 const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
 667                 struct strbuf buf = STRBUF_INIT;
 668
 669                 argv[3] = sha1_to_hex(sha1);
 670                 cp.argv = argv;
 671                 prepare_submodule_repo_env(&cp.env_array);
 672                 cp.git_cmd = 1;
 673                 cp.no_stdin = 1;
 674                 cp.dir = path;
 675                 if (!capture_command(&cp, &buf, 1024) && !buf.len)
 676                         is_present = 1;
 677
 678                 strbuf_release(&buf);
 679         }
 680         return is_present;
 681 }
 682
 683 static void submodule_collect_changed_cb(struct diff_queue_struct *q,
 684                                          struct diff_options *options,
 685                                          void *data)
 686 {
 687         int i;
 688         for (i = 0; i < q->nr; i++) {
 689                 struct diff_filepair *p = q->queue[i];
 690                 if (!S_ISGITLINK(p->two->mode))
 691                         continue;
 692
 693                 if (S_ISGITLINK(p->one->mode)) {
 694                         /* NEEDSWORK: We should honor the name configured in
 695                          * the .gitmodules file of the commit we are examining
 696                          * here to be able to correctly follow submodules
 697                          * being moved around. */
 698                         struct string_list_item *path;
 699                         path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
 700                         if (!path && !is_submodule_commit_present(p->two->path, p->two->oid.hash))
 701                                 string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
 702                 } else {
 703                         /* Submodule is new or was moved here */
 704                         /* NEEDSWORK: When the .git directories of submodules
 705                          * live inside the superprojects .git directory some
 706                          * day we should fetch new submodules directly into
 707                          * that location too when config or options request
 708                          * that so they can be checked out from there. */
 709                         continue;
 710                 }
 711         }
 712 }
 713
 714 static int add_sha1_to_array(const char *ref, const struct object_id *oid,
 715                              int flags, void *data)
 716 {
 717         sha1_array_append(data, oid->hash);
 718         return 0;
 719 }
 720
 721 void check_for_new_submodule_commits(unsigned char new_sha1[20])
 722 {
 723         if (!initialized_fetch_ref_tips) {
 724                 for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
 725                 initialized_fetch_ref_tips = 1;
 726         }
 727
 728         sha1_array_append(&ref_tips_after_fetch, new_sha1);
 729 }
 730
 731 static int add_sha1_to_argv(const unsigned char sha1[20], void *data)
 732 {
 733         argv_array_push(data, sha1_to_hex(sha1));
 734         return 0;
 735 }
 736
 737 static void calculate_changed_submodule_paths(void)
 738 {
 739         struct rev_info rev;
 740         struct commit *commit;
 741         struct argv_array argv = ARGV_ARRAY_INIT;
 742
 743         /* No need to check if there are no submodules configured */
 744         if (!submodule_from_path(NULL, NULL))
 745                 return;
 746
 747         init_revisions(&rev, NULL);
 748         argv_array_push(&argv, "--"); /* argv[0] program name */
 749         sha1_array_for_each_unique(&ref_tips_after_fetch,
 750                                    add_sha1_to_argv, &argv);
 751         argv_array_push(&argv, "--not");
 752         sha1_array_for_each_unique(&ref_tips_before_fetch,
 753                                    add_sha1_to_argv, &argv);
 754         setup_revisions(argv.argc, argv.argv, &rev, NULL);
 755         if (prepare_revision_walk(&rev))
 756                 die("revision walk setup failed");
 757
 758         /*
 759          * Collect all submodules (whether checked out or not) for which new
 760          * commits have been recorded upstream in "changed_submodule_paths".
 761          */
 762         while ((commit = get_revision(&rev))) {
 763                 struct commit_list *parent = commit->parents;
 764                 while (parent) {
 765                         struct diff_options diff_opts;
 766                         diff_setup(&diff_opts);
 767                         DIFF_OPT_SET(&diff_opts, RECURSIVE);
 768                         diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
 769                         diff_opts.format_callback = submodule_collect_changed_cb;
 770                         diff_setup_done(&diff_opts);
 771                         diff_tree_sha1(parent->item->object.oid.hash, commit->object.oid.hash, "", &diff_opts);
 772                         diffcore_std(&diff_opts);
 773                         diff_flush(&diff_opts);
 774                         parent = parent->next;
 775                 }
 776         }
 777
 778         argv_array_clear(&argv);
 779         sha1_array_clear(&ref_tips_before_fetch);
 780         sha1_array_clear(&ref_tips_after_fetch);
 781         initialized_fetch_ref_tips = 0;
 782 }
 783
 784 struct submodule_parallel_fetch {
 785         int count;
 786         struct argv_array args;
 787         const char *work_tree;
 788         const char *prefix;
 789         int command_line_option;
 790         int quiet;
 791         int result;
 792 };
 793 #define SPF_INIT {0, ARGV_ARRAY_INIT, NULL, NULL, 0, 0, 0}
 794
 795 static int get_next_submodule(struct child_process *cp,
 796                               struct strbuf *err, void *data, void **task_cb)
 797 {
 798         int ret = 0;
 799         struct submodule_parallel_fetch *spf = data;
 800
 801         for (; spf->count < active_nr; spf->count++) {
 802                 struct strbuf submodule_path = STRBUF_INIT;
 803                 struct strbuf submodule_git_dir = STRBUF_INIT;
 804                 struct strbuf submodule_prefix = STRBUF_INIT;
 805                 const struct cache_entry *ce = active_cache[spf->count];
 806                 const char *git_dir, *default_argv;
 807                 const struct submodule *submodule;
 808
 809                 if (!S_ISGITLINK(ce->ce_mode))
 810                         continue;
 811
 812                 submodule = submodule_from_path(null_sha1, ce->name);
 813                 if (!submodule)
 814                         submodule = submodule_from_name(null_sha1, ce->name);
 815
 816                 default_argv = "yes";
 817                 if (spf->command_line_option == RECURSE_SUBMODULES_DEFAULT) {
 818                         if (submodule &&
 819                             submodule->fetch_recurse !=
 820                                                 RECURSE_SUBMODULES_NONE) {
 821                                 if (submodule->fetch_recurse ==
 822                                                 RECURSE_SUBMODULES_OFF)
 823                                         continue;
 824                                 if (submodule->fetch_recurse ==
 825                                                 RECURSE_SUBMODULES_ON_DEMAND) {
 826                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 827                                                 continue;
 828                                         default_argv = "on-demand";
 829                                 }
 830                         } else {
 831                                 if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
 832                                     gitmodules_is_unmerged)
 833                                         continue;
 834                                 if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
 835                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 836                                                 continue;
 837                                         default_argv = "on-demand";
 838                                 }
 839                         }
 840                 } else if (spf->command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
 841                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 842                                 continue;
 843                         default_argv = "on-demand";
 844                 }
 845
 846                 strbuf_addf(&submodule_path, "%s/%s", spf->work_tree, ce->name);
 847                 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
 848                 strbuf_addf(&submodule_prefix, "%s%s/", spf->prefix, ce->name);
 849                 git_dir = read_gitfile(submodule_git_dir.buf);
 850                 if (!git_dir)
 851                         git_dir = submodule_git_dir.buf;
 852                 if (is_directory(git_dir)) {
 853                         child_process_init(cp);
 854                         cp->dir = strbuf_detach(&submodule_path, NULL);
 855                         prepare_submodule_repo_env(&cp->env_array);
 856                         cp->git_cmd = 1;
 857                         if (!spf->quiet)
 858                                 strbuf_addf(err, "Fetching submodule %s%s\n",
 859                                             spf->prefix, ce->name);
 860                         argv_array_init(&cp->args);
 861                         argv_array_pushv(&cp->args, spf->args.argv);
 862                         argv_array_push(&cp->args, default_argv);
 863                         argv_array_push(&cp->args, "--submodule-prefix");
 864                         argv_array_push(&cp->args, submodule_prefix.buf);
 865                         ret = 1;
 866                 }
 867                 strbuf_release(&submodule_path);
 868                 strbuf_release(&submodule_git_dir);
 869                 strbuf_release(&submodule_prefix);
 870                 if (ret) {
 871                         spf->count++;
 872                         return 1;
 873                 }
 874         }
 875         return 0;
 876 }
 877
 878 static int fetch_start_failure(struct strbuf *err,
 879                                void *cb, void *task_cb)
 880 {
 881         struct submodule_parallel_fetch *spf = cb;
 882
 883         spf->result = 1;
 884
 885         return 0;
 886 }
 887
 888 static int fetch_finish(int retvalue, struct strbuf *err,
 889                         void *cb, void *task_cb)
 890 {
 891         struct submodule_parallel_fetch *spf = cb;
 892
 893         if (retvalue)
 894                 spf->result = 1;
 895
 896         return 0;
 897 }
 898
 899 int fetch_populated_submodules(const struct argv_array *options,
 900                                const char *prefix, int command_line_option,
 901                                int quiet, int max_parallel_jobs)
 902 {
 903         int i;
 904         struct submodule_parallel_fetch spf = SPF_INIT;
 905
 906         spf.work_tree = get_git_work_tree();
 907         spf.command_line_option = command_line_option;
 908         spf.quiet = quiet;
 909         spf.prefix = prefix;
 910
 911         if (!spf.work_tree)
 912                 goto out;
 913
 914         if (read_cache() < 0)
 915                 die("index file corrupt");
 916
 917         argv_array_push(&spf.args, "fetch");
 918         for (i = 0; i < options->argc; i++)
 919                 argv_array_push(&spf.args, options->argv[i]);
 920         argv_array_push(&spf.args, "--recurse-submodules-default");
 921         /* default value, "--submodule-prefix" and its value are added later */
 922
 923         if (max_parallel_jobs < 0)
 924                 max_parallel_jobs = parallel_jobs;
 925
 926         calculate_changed_submodule_paths();
 927         run_processes_parallel(max_parallel_jobs,
 928                                get_next_submodule,
 929                                fetch_start_failure,
 930                                fetch_finish,
 931                                &spf);
 932
 933         argv_array_clear(&spf.args);
 934 out:
 935         string_list_clear(&changed_submodule_paths, 1);
 936         return spf.result;
 937 }
 938
 939 unsigned is_submodule_modified(const char *path, int ignore_untracked)
 940 {
 941         ssize_t len;
 942         struct child_process cp = CHILD_PROCESS_INIT;
 943         const char *argv[] = {
 944                 "status",
 945                 "--porcelain",
 946                 NULL,
 947                 NULL,
 948         };
 949         struct strbuf buf = STRBUF_INIT;
 950         unsigned dirty_submodule = 0;
 951         const char *line, *next_line;
 952         const char *git_dir;
 953
 954         strbuf_addf(&buf, "%s/.git", path);
 955         git_dir = read_gitfile(buf.buf);
 956         if (!git_dir)
 957                 git_dir = buf.buf;
 958         if (!is_directory(git_dir)) {
 959                 strbuf_release(&buf);
 960                 /* The submodule is not checked out, so it is not modified */
 961                 return 0;
 962
 963         }
 964         strbuf_reset(&buf);
 965
 966         if (ignore_untracked)
 967                 argv[2] = "-uno";
 968
 969         cp.argv = argv;
 970         prepare_submodule_repo_env(&cp.env_array);
 971         cp.git_cmd = 1;
 972         cp.no_stdin = 1;
 973         cp.out = -1;
 974         cp.dir = path;
 975         if (start_command(&cp))
 976                 die("Could not run 'git status --porcelain' in submodule %s", path);
 977
 978         len = strbuf_read(&buf, cp.out, 1024);
 979         line = buf.buf;
 980         while (len > 2) {
 981                 if ((line[0] == '?') && (line[1] == '?')) {
 982                         dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
 983                         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 984                                 break;
 985                 } else {
 986                         dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
 987                         if (ignore_untracked ||
 988                             (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
 989                                 break;
 990                 }
 991                 next_line = strchr(line, '\n');
 992                 if (!next_line)
 993                         break;
 994                 next_line++;
 995                 len -= (next_line - line);
 996                 line = next_line;
 997         }
 998         close(cp.out);
 999
1000         if (finish_command(&cp))
1001                 die("'git status --porcelain' failed in submodule %s", path);
1002
1003         strbuf_release(&buf);
1004         return dirty_submodule;
1005 }
1006
1007 int submodule_uses_gitfile(const char *path)
1008 {
1009         struct child_process cp = CHILD_PROCESS_INIT;
1010         const char *argv[] = {
1011                 "submodule",
1012                 "foreach",
1013                 "--quiet",
1014                 "--recursive",
1015                 "test -f .git",
1016                 NULL,
1017         };
1018         struct strbuf buf = STRBUF_INIT;
1019         const char *git_dir;
1020
1021         strbuf_addf(&buf, "%s/.git", path);
1022         git_dir = read_gitfile(buf.buf);
1023         if (!git_dir) {
1024                 strbuf_release(&buf);
1025                 return 0;
1026         }
1027         strbuf_release(&buf);
1028
1029         /* Now test that all nested submodules use a gitfile too */
1030         cp.argv = argv;
1031         prepare_submodule_repo_env(&cp.env_array);
1032         cp.git_cmd = 1;
1033         cp.no_stdin = 1;
1034         cp.no_stderr = 1;
1035         cp.no_stdout = 1;
1036         cp.dir = path;
1037         if (run_command(&cp))
1038                 return 0;
1039
1040         return 1;
1041 }
1042
1043 int ok_to_remove_submodule(const char *path)
1044 {
1045         ssize_t len;
1046         struct child_process cp = CHILD_PROCESS_INIT;
1047         const char *argv[] = {
1048                 "status",
1049                 "--porcelain",
1050                 "-u",
1051                 "--ignore-submodules=none",
1052                 NULL,
1053         };
1054         struct strbuf buf = STRBUF_INIT;
1055         int ok_to_remove = 1;
1056
1057         if (!file_exists(path) || is_empty_dir(path))
1058                 return 1;
1059
1060         if (!submodule_uses_gitfile(path))
1061                 return 0;
1062
1063         cp.argv = argv;
1064         prepare_submodule_repo_env(&cp.env_array);
1065         cp.git_cmd = 1;
1066         cp.no_stdin = 1;
1067         cp.out = -1;
1068         cp.dir = path;
1069         if (start_command(&cp))
1070                 die("Could not run 'git status --porcelain -uall --ignore-submodules=none' in submodule %s", path);
1071
1072         len = strbuf_read(&buf, cp.out, 1024);
1073         if (len > 2)
1074                 ok_to_remove = 0;
1075         close(cp.out);
1076
1077         if (finish_command(&cp))
1078                 die("'git status --porcelain -uall --ignore-submodules=none' failed in submodule %s", path);
1079
1080         strbuf_release(&buf);
1081         return ok_to_remove;
1082 }
1083
1084 static int find_first_merges(struct object_array *result, const char *path,
1085                 struct commit *a, struct commit *b)
1086 {
1087         int i, j;
1088         struct object_array merges = OBJECT_ARRAY_INIT;
1089         struct commit *commit;
1090         int contains_another;
1091
1092         char merged_revision[42];
1093         const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
1094                                    "--all", merged_revision, NULL };
1095         struct rev_info revs;
1096         struct setup_revision_opt rev_opts;
1097
1098         memset(result, 0, sizeof(struct object_array));
1099         memset(&rev_opts, 0, sizeof(rev_opts));
1100
1101         /* get all revisions that merge commit a */
1102         snprintf(merged_revision, sizeof(merged_revision), "^%s",
1103                         oid_to_hex(&a->object.oid));
1104         init_revisions(&revs, NULL);
1105         rev_opts.submodule = path;
1106         setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
1107
1108         /* save all revisions from the above list that contain b */
1109         if (prepare_revision_walk(&revs))
1110                 die("revision walk setup failed");
1111         while ((commit = get_revision(&revs)) != NULL) {
1112                 struct object *o = &(commit->object);
1113                 if (in_merge_bases(b, commit))
1114                         add_object_array(o, NULL, &merges);
1115         }
1116         reset_revision_walk();
1117
1118         /* Now we've got all merges that contain a and b. Prune all
1119          * merges that contain another found merge and save them in
1120          * result.
1121          */
1122         for (i = 0; i < merges.nr; i++) {
1123                 struct commit *m1 = (struct commit *) merges.objects[i].item;
1124
1125                 contains_another = 0;
1126                 for (j = 0; j < merges.nr; j++) {
1127                         struct commit *m2 = (struct commit *) merges.objects[j].item;
1128                         if (i != j && in_merge_bases(m2, m1)) {
1129                                 contains_another = 1;
1130                                 break;
1131                         }
1132                 }
1133
1134                 if (!contains_another)
1135                         add_object_array(merges.objects[i].item, NULL, result);
1136         }
1137
1138         free(merges.objects);
1139         return result->nr;
1140 }
1141
1142 static void print_commit(struct commit *commit)
1143 {
1144         struct strbuf sb = STRBUF_INIT;
1145         struct pretty_print_context ctx = {0};
1146         ctx.date_mode.type = DATE_NORMAL;
1147         format_commit_message(commit, " %h: %m %s", &sb, &ctx);
1148         fprintf(stderr, "%s\n", sb.buf);
1149         strbuf_release(&sb);
1150 }
1151
1152 #define MERGE_WARNING(path, msg) \
1153         warning("Failed to merge submodule %s (%s)", path, msg);
1154
1155 int merge_submodule(unsigned char result[20], const char *path,
1156                     const unsigned char base[20], const unsigned char a[20],
1157                     const unsigned char b[20], int search)
1158 {
1159         struct commit *commit_base, *commit_a, *commit_b;
1160         int parent_count;
1161         struct object_array merges;
1162
1163         int i;
1164
1165         /* store a in result in case we fail */
1166         hashcpy(result, a);
1167
1168         /* we can not handle deletion conflicts */
1169         if (is_null_sha1(base))
1170                 return 0;
1171         if (is_null_sha1(a))
1172                 return 0;
1173         if (is_null_sha1(b))
1174                 return 0;
1175
1176         if (add_submodule_odb(path)) {
1177                 MERGE_WARNING(path, "not checked out");
1178                 return 0;
1179         }
1180
1181         if (!(commit_base = lookup_commit_reference(base)) ||
1182             !(commit_a = lookup_commit_reference(a)) ||
1183             !(commit_b = lookup_commit_reference(b))) {
1184                 MERGE_WARNING(path, "commits not present");
1185                 return 0;
1186         }
1187
1188         /* check whether both changes are forward */
1189         if (!in_merge_bases(commit_base, commit_a) ||
1190             !in_merge_bases(commit_base, commit_b)) {
1191                 MERGE_WARNING(path, "commits don't follow merge-base");
1192                 return 0;
1193         }
1194
1195         /* Case #1: a is contained in b or vice versa */
1196         if (in_merge_bases(commit_a, commit_b)) {
1197                 hashcpy(result, b);
1198                 return 1;
1199         }
1200         if (in_merge_bases(commit_b, commit_a)) {
1201                 hashcpy(result, a);
1202                 return 1;
1203         }
1204
1205         /*
1206          * Case #2: There are one or more merges that contain a and b in
1207          * the submodule. If there is only one, then present it as a
1208          * suggestion to the user, but leave it marked unmerged so the
1209          * user needs to confirm the resolution.
1210          */
1211
1212         /* Skip the search if makes no sense to the calling context.  */
1213         if (!search)
1214                 return 0;
1215
1216         /* find commit which merges them */
1217         parent_count = find_first_merges(&merges, path, commit_a, commit_b);
1218         switch (parent_count) {
1219         case 0:
1220                 MERGE_WARNING(path, "merge following commits not found");
1221                 break;
1222
1223         case 1:
1224                 MERGE_WARNING(path, "not fast-forward");
1225                 fprintf(stderr, "Found a possible merge resolution "
1226                                 "for the submodule:\n");
1227                 print_commit((struct commit *) merges.objects[0].item);
1228                 fprintf(stderr,
1229                         "If this is correct simply add it to the index "
1230                         "for example\n"
1231                         "by using:\n\n"
1232                         "  git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1233                         "which will accept this suggestion.\n",
1234                         oid_to_hex(&merges.objects[0].item->oid), path);
1235                 break;
1236
1237         default:
1238                 MERGE_WARNING(path, "multiple merges found");
1239                 for (i = 0; i < merges.nr; i++)
1240                         print_commit((struct commit *) merges.objects[i].item);
1241         }
1242
1243         free(merges.objects);
1244         return 0;
1245 }
1246
1247 /* Update gitfile and core.worktree setting to connect work tree and git dir */
1248 void connect_work_tree_and_git_dir(const char *work_tree, const char *git_dir)
1249 {
1250         struct strbuf file_name = STRBUF_INIT;
1251         struct strbuf rel_path = STRBUF_INIT;
1252         const char *real_work_tree = xstrdup(real_path(work_tree));
1253
1254         /* Update gitfile */
1255         strbuf_addf(&file_name, "%s/.git", work_tree);
1256         write_file(file_name.buf, "gitdir: %s",
1257                    relative_path(git_dir, real_work_tree, &rel_path));
1258
1259         /* Update core.worktree setting */
1260         strbuf_reset(&file_name);
1261         strbuf_addf(&file_name, "%s/config", git_dir);
1262         git_config_set_in_file(file_name.buf, "core.worktree",
1263                                relative_path(real_work_tree, git_dir,
1264                                              &rel_path));
1265
1266         strbuf_release(&file_name);
1267         strbuf_release(&rel_path);
1268         free((void *)real_work_tree);
1269 }
1270
1271 int parallel_submodules(void)
1272 {
1273         return parallel_jobs;
1274 }
1275
1276 void prepare_submodule_repo_env(struct argv_array *out)
1277 {
1278         const char * const *var;
1279
1280         for (var = local_repo_env; *var; var++) {
1281                 if (strcmp(*var, CONFIG_DATA_ENVIRONMENT))
1282                         argv_array_push(out, *var);
1283         }
1284         argv_array_push(out, "GIT_DIR=.git");
1285 }