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         int ret = 0;
 127
 128         ret = strbuf_git_path_submodule(&objects_directory, path, "objects/");
 129         if (ret)
 130                 goto done;
 131         if (!is_directory(objects_directory.buf)) {
 132                 ret = -1;
 133                 goto done;
 134         }
 135         add_to_alternates_memory(objects_directory.buf);
 136 done:
 137         strbuf_release(&objects_directory);
 138         return ret;
 139 }
 140
 141 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
 142                                              const char *path)
 143 {
 144         const struct submodule *submodule = submodule_from_path(null_sha1, path);
 145         if (submodule) {
 146                 if (submodule->ignore)
 147                         handle_ignore_submodules_arg(diffopt, submodule->ignore);
 148                 else if (gitmodules_is_unmerged)
 149                         DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 150         }
 151 }
 152
 153 int submodule_config(const char *var, const char *value, void *cb)
 154 {
 155         if (!strcmp(var, "submodule.fetchjobs")) {
 156                 parallel_jobs = git_config_int(var, value);
 157                 if (parallel_jobs < 0)
 158                         die(_("negative values not allowed for submodule.fetchJobs"));
 159                 return 0;
 160         } else if (starts_with(var, "submodule."))
 161                 return parse_submodule_config_option(var, value);
 162         else if (!strcmp(var, "fetch.recursesubmodules")) {
 163                 config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
 164                 return 0;
 165         }
 166         return 0;
 167 }
 168
 169 void gitmodules_config(void)
 170 {
 171         const char *work_tree = get_git_work_tree();
 172         if (work_tree) {
 173                 struct strbuf gitmodules_path = STRBUF_INIT;
 174                 int pos;
 175                 strbuf_addstr(&gitmodules_path, work_tree);
 176                 strbuf_addstr(&gitmodules_path, "/.gitmodules");
 177                 if (read_cache() < 0)
 178                         die("index file corrupt");
 179                 pos = cache_name_pos(".gitmodules", 11);
 180                 if (pos < 0) { /* .gitmodules not found or isn't merged */
 181                         pos = -1 - pos;
 182                         if (active_nr > pos) {  /* there is a .gitmodules */
 183                                 const struct cache_entry *ce = active_cache[pos];
 184                                 if (ce_namelen(ce) == 11 &&
 185                                     !memcmp(ce->name, ".gitmodules", 11))
 186                                         gitmodules_is_unmerged = 1;
 187                         }
 188                 } else if (pos < active_nr) {
 189                         struct stat st;
 190                         if (lstat(".gitmodules", &st) == 0 &&
 191                             ce_match_stat(active_cache[pos], &st, 0) & DATA_CHANGED)
 192                                 gitmodules_is_modified = 1;
 193                 }
 194
 195                 if (!gitmodules_is_unmerged)
 196                         git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
 197                 strbuf_release(&gitmodules_path);
 198         }
 199 }
 200
 201 int parse_submodule_update_strategy(const char *value,
 202                 struct submodule_update_strategy *dst)
 203 {
 204         free((void*)dst->command);
 205         dst->command = NULL;
 206         if (!strcmp(value, "none"))
 207                 dst->type = SM_UPDATE_NONE;
 208         else if (!strcmp(value, "checkout"))
 209                 dst->type = SM_UPDATE_CHECKOUT;
 210         else if (!strcmp(value, "rebase"))
 211                 dst->type = SM_UPDATE_REBASE;
 212         else if (!strcmp(value, "merge"))
 213                 dst->type = SM_UPDATE_MERGE;
 214         else if (skip_prefix(value, "!", &value)) {
 215                 dst->type = SM_UPDATE_COMMAND;
 216                 dst->command = xstrdup(value);
 217         } else
 218                 return -1;
 219         return 0;
 220 }
 221
 222 const char *submodule_strategy_to_string(const struct submodule_update_strategy *s)
 223 {
 224         struct strbuf sb = STRBUF_INIT;
 225         switch (s->type) {
 226         case SM_UPDATE_CHECKOUT:
 227                 return "checkout";
 228         case SM_UPDATE_MERGE:
 229                 return "merge";
 230         case SM_UPDATE_REBASE:
 231                 return "rebase";
 232         case SM_UPDATE_NONE:
 233                 return "none";
 234         case SM_UPDATE_UNSPECIFIED:
 235                 return NULL;
 236         case SM_UPDATE_COMMAND:
 237                 strbuf_addf(&sb, "!%s", s->command);
 238                 return strbuf_detach(&sb, NULL);
 239         }
 240         return NULL;
 241 }
 242
 243 void handle_ignore_submodules_arg(struct diff_options *diffopt,
 244                                   const char *arg)
 245 {
 246         DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
 247         DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 248         DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
 249
 250         if (!strcmp(arg, "all"))
 251                 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 252         else if (!strcmp(arg, "untracked"))
 253                 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 254         else if (!strcmp(arg, "dirty"))
 255                 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
 256         else if (strcmp(arg, "none"))
 257                 die("bad --ignore-submodules argument: %s", arg);
 258 }
 259
 260 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
 261                 struct commit *left, struct commit *right,
 262                 struct commit_list *merge_bases)
 263 {
 264         struct commit_list *list;
 265
 266         init_revisions(rev, NULL);
 267         setup_revisions(0, NULL, rev, NULL);
 268         rev->left_right = 1;
 269         rev->first_parent_only = 1;
 270         left->object.flags |= SYMMETRIC_LEFT;
 271         add_pending_object(rev, &left->object, path);
 272         add_pending_object(rev, &right->object, path);
 273         for (list = merge_bases; list; list = list->next) {
 274                 list->item->object.flags |= UNINTERESTING;
 275                 add_pending_object(rev, &list->item->object,
 276                         oid_to_hex(&list->item->object.oid));
 277         }
 278         return prepare_revision_walk(rev);
 279 }
 280
 281 static void print_submodule_summary(struct rev_info *rev, FILE *f,
 282                 const char *line_prefix,
 283                 const char *del, const char *add, const char *reset)
 284 {
 285         static const char format[] = "  %m %s";
 286         struct strbuf sb = STRBUF_INIT;
 287         struct commit *commit;
 288
 289         while ((commit = get_revision(rev))) {
 290                 struct pretty_print_context ctx = {0};
 291                 ctx.date_mode = rev->date_mode;
 292                 ctx.output_encoding = get_log_output_encoding();
 293                 strbuf_setlen(&sb, 0);
 294                 strbuf_addstr(&sb, line_prefix);
 295                 if (commit->object.flags & SYMMETRIC_LEFT) {
 296                         if (del)
 297                                 strbuf_addstr(&sb, del);
 298                 }
 299                 else if (add)
 300                         strbuf_addstr(&sb, add);
 301                 format_commit_message(commit, format, &sb, &ctx);
 302                 if (reset)
 303                         strbuf_addstr(&sb, reset);
 304                 strbuf_addch(&sb, '\n');
 305                 fprintf(f, "%s", sb.buf);
 306         }
 307         strbuf_release(&sb);
 308 }
 309
 310 /* Helper function to display the submodule header line prior to the full
 311  * summary output. If it can locate the submodule objects directory it will
 312  * attempt to lookup both the left and right commits and put them into the
 313  * left and right pointers.
 314  */
 315 static void show_submodule_header(FILE *f, const char *path,
 316                 const char *line_prefix,
 317                 struct object_id *one, struct object_id *two,
 318                 unsigned dirty_submodule, const char *meta,
 319                 const char *reset,
 320                 struct commit **left, struct commit **right,
 321                 struct commit_list **merge_bases)
 322 {
 323         const char *message = NULL;
 324         struct strbuf sb = STRBUF_INIT;
 325         int fast_forward = 0, fast_backward = 0;
 326
 327         if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
 328                 fprintf(f, "%sSubmodule %s contains untracked content\n",
 329                         line_prefix, path);
 330         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 331                 fprintf(f, "%sSubmodule %s contains modified content\n",
 332                         line_prefix, path);
 333
 334         if (is_null_oid(one))
 335                 message = "(new submodule)";
 336         else if (is_null_oid(two))
 337                 message = "(submodule deleted)";
 338
 339         if (add_submodule_odb(path)) {
 340                 if (!message)
 341                         message = "(not initialized)";
 342                 goto output_header;
 343         }
 344
 345         /*
 346          * Attempt to lookup the commit references, and determine if this is
 347          * a fast forward or fast backwards update.
 348          */
 349         *left = lookup_commit_reference(one->hash);
 350         *right = lookup_commit_reference(two->hash);
 351
 352         /*
 353          * Warn about missing commits in the submodule project, but only if
 354          * they aren't null.
 355          */
 356         if ((!is_null_oid(one) && !*left) ||
 357              (!is_null_oid(two) && !*right))
 358                 message = "(commits not present)";
 359
 360         *merge_bases = get_merge_bases(*left, *right);
 361         if (*merge_bases) {
 362                 if ((*merge_bases)->item == *left)
 363                         fast_forward = 1;
 364                 else if ((*merge_bases)->item == *right)
 365                         fast_backward = 1;
 366         }
 367
 368         if (!oidcmp(one, two)) {
 369                 strbuf_release(&sb);
 370                 return;
 371         }
 372
 373 output_header:
 374         strbuf_addf(&sb, "%s%sSubmodule %s ", line_prefix, meta, path);
 375         strbuf_add_unique_abbrev(&sb, one->hash, DEFAULT_ABBREV);
 376         strbuf_addstr(&sb, (fast_backward || fast_forward) ? ".." : "...");
 377         strbuf_add_unique_abbrev(&sb, two->hash, DEFAULT_ABBREV);
 378         if (message)
 379                 strbuf_addf(&sb, " %s%s\n", message, reset);
 380         else
 381                 strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
 382         fwrite(sb.buf, sb.len, 1, f);
 383
 384         strbuf_release(&sb);
 385 }
 386
 387 void show_submodule_summary(FILE *f, const char *path,
 388                 const char *line_prefix,
 389                 struct object_id *one, struct object_id *two,
 390                 unsigned dirty_submodule, const char *meta,
 391                 const char *del, const char *add, const char *reset)
 392 {
 393         struct rev_info rev;
 394         struct commit *left = NULL, *right = NULL;
 395         struct commit_list *merge_bases = NULL;
 396
 397         show_submodule_header(f, path, line_prefix, one, two, dirty_submodule,
 398                               meta, reset, &left, &right, &merge_bases);
 399
 400         /*
 401          * If we don't have both a left and a right pointer, there is no
 402          * reason to try and display a summary. The header line should contain
 403          * all the information the user needs.
 404          */
 405         if (!left || !right)
 406                 goto out;
 407
 408         /* Treat revision walker failure the same as missing commits */
 409         if (prepare_submodule_summary(&rev, path, left, right, merge_bases)) {
 410                 fprintf(f, "%s(revision walker failed)\n", line_prefix);
 411                 goto out;
 412         }
 413
 414         print_submodule_summary(&rev, f, line_prefix, del, add, reset);
 415
 416 out:
 417         if (merge_bases)
 418                 free_commit_list(merge_bases);
 419         clear_commit_marks(left, ~0);
 420         clear_commit_marks(right, ~0);
 421 }
 422
 423 void show_submodule_inline_diff(FILE *f, const char *path,
 424                 const char *line_prefix,
 425                 struct object_id *one, struct object_id *two,
 426                 unsigned dirty_submodule, const char *meta,
 427                 const char *del, const char *add, const char *reset,
 428                 const struct diff_options *o)
 429 {
 430         const struct object_id *old = &empty_tree_oid, *new = &empty_tree_oid;
 431         struct commit *left = NULL, *right = NULL;
 432         struct commit_list *merge_bases = NULL;
 433         struct strbuf submodule_dir = STRBUF_INIT;
 434         struct child_process cp = CHILD_PROCESS_INIT;
 435
 436         show_submodule_header(f, path, line_prefix, one, two, dirty_submodule,
 437                               meta, reset, &left, &right, &merge_bases);
 438
 439         /* We need a valid left and right commit to display a difference */
 440         if (!(left || is_null_oid(one)) ||
 441             !(right || is_null_oid(two)))
 442                 goto done;
 443
 444         if (left)
 445                 old = one;
 446         if (right)
 447                 new = two;
 448
 449         fflush(f);
 450         cp.git_cmd = 1;
 451         cp.dir = path;
 452         cp.out = dup(fileno(f));
 453         cp.no_stdin = 1;
 454
 455         /* TODO: other options may need to be passed here. */
 456         argv_array_push(&cp.args, "diff");
 457         argv_array_pushf(&cp.args, "--line-prefix=%s", line_prefix);
 458         if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
 459                 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
 460                                  o->b_prefix, path);
 461                 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
 462                                  o->a_prefix, path);
 463         } else {
 464                 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
 465                                  o->a_prefix, path);
 466                 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
 467                                  o->b_prefix, path);
 468         }
 469         argv_array_push(&cp.args, oid_to_hex(old));
 470         /*
 471          * If the submodule has modified content, we will diff against the
 472          * work tree, under the assumption that the user has asked for the
 473          * diff format and wishes to actually see all differences even if they
 474          * haven't yet been committed to the submodule yet.
 475          */
 476         if (!(dirty_submodule & DIRTY_SUBMODULE_MODIFIED))
 477                 argv_array_push(&cp.args, oid_to_hex(new));
 478
 479         if (run_command(&cp))
 480                 fprintf(f, "(diff failed)\n");
 481
 482 done:
 483         strbuf_release(&submodule_dir);
 484         if (merge_bases)
 485                 free_commit_list(merge_bases);
 486         if (left)
 487                 clear_commit_marks(left, ~0);
 488         if (right)
 489                 clear_commit_marks(right, ~0);
 490 }
 491
 492 void set_config_fetch_recurse_submodules(int value)
 493 {
 494         config_fetch_recurse_submodules = value;
 495 }
 496
 497 static int has_remote(const char *refname, const struct object_id *oid,
 498                       int flags, void *cb_data)
 499 {
 500         return 1;
 501 }
 502
 503 static int append_sha1_to_argv(const unsigned char sha1[20], void *data)
 504 {
 505         struct argv_array *argv = data;
 506         argv_array_push(argv, sha1_to_hex(sha1));
 507         return 0;
 508 }
 509
 510 static int check_has_commit(const unsigned char sha1[20], void *data)
 511 {
 512         int *has_commit = data;
 513
 514         if (!lookup_commit_reference(sha1))
 515                 *has_commit = 0;
 516
 517         return 0;
 518 }
 519
 520 static int submodule_has_commits(const char *path, struct sha1_array *commits)
 521 {
 522         int has_commit = 1;
 523
 524         if (add_submodule_odb(path))
 525                 return 0;
 526
 527         sha1_array_for_each_unique(commits, check_has_commit, &has_commit);
 528         return has_commit;
 529 }
 530
 531 static int submodule_needs_pushing(const char *path, struct sha1_array *commits)
 532 {
 533         if (!submodule_has_commits(path, commits))
 534                 /*
 535                  * NOTE: We do consider it safe to return "no" here. The
 536                  * correct answer would be "We do not know" instead of
 537                  * "No push needed", but it is quite hard to change
 538                  * the submodule pointer without having the submodule
 539                  * around. If a user did however change the submodules
 540                  * without having the submodule around, this indicates
 541                  * an expert who knows what they are doing or a
 542                  * maintainer integrating work from other people. In
 543                  * both cases it should be safe to skip this check.
 544                  */
 545                 return 0;
 546
 547         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 548                 struct child_process cp = CHILD_PROCESS_INIT;
 549                 struct strbuf buf = STRBUF_INIT;
 550                 int needs_pushing = 0;
 551
 552                 argv_array_push(&cp.args, "rev-list");
 553                 sha1_array_for_each_unique(commits, append_sha1_to_argv, &cp.args);
 554                 argv_array_pushl(&cp.args, "--not", "--remotes", "-n", "1" , NULL);
 555
 556                 prepare_submodule_repo_env(&cp.env_array);
 557                 cp.git_cmd = 1;
 558                 cp.no_stdin = 1;
 559                 cp.out = -1;
 560                 cp.dir = path;
 561                 if (start_command(&cp))
 562                         die("Could not run 'git rev-list <commits> --not --remotes -n 1' command in submodule %s",
 563                                         path);
 564                 if (strbuf_read(&buf, cp.out, 41))
 565                         needs_pushing = 1;
 566                 finish_command(&cp);
 567                 close(cp.out);
 568                 strbuf_release(&buf);
 569                 return needs_pushing;
 570         }
 571
 572         return 0;
 573 }
 574
 575 static struct sha1_array *submodule_commits(struct string_list *submodules,
 576                                             const char *path)
 577 {
 578         struct string_list_item *item;
 579
 580         item = string_list_insert(submodules, path);
 581         if (item->util)
 582                 return (struct sha1_array *) item->util;
 583
 584         /* NEEDSWORK: should we have sha1_array_init()? */
 585         item->util = xcalloc(1, sizeof(struct sha1_array));
 586         return (struct sha1_array *) item->util;
 587 }
 588
 589 static void collect_submodules_from_diff(struct diff_queue_struct *q,
 590                                          struct diff_options *options,
 591                                          void *data)
 592 {
 593         int i;
 594         struct string_list *submodules = data;
 595
 596         for (i = 0; i < q->nr; i++) {
 597                 struct diff_filepair *p = q->queue[i];
 598                 struct sha1_array *commits;
 599                 if (!S_ISGITLINK(p->two->mode))
 600                         continue;
 601                 commits = submodule_commits(submodules, p->two->path);
 602                 sha1_array_append(commits, p->two->oid.hash);
 603         }
 604 }
 605
 606 static void find_unpushed_submodule_commits(struct commit *commit,
 607                 struct string_list *needs_pushing)
 608 {
 609         struct rev_info rev;
 610
 611         init_revisions(&rev, NULL);
 612         rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
 613         rev.diffopt.format_callback = collect_submodules_from_diff;
 614         rev.diffopt.format_callback_data = needs_pushing;
 615         diff_tree_combined_merge(commit, 1, &rev);
 616 }
 617
 618 static void free_submodules_sha1s(struct string_list *submodules)
 619 {
 620         struct string_list_item *item;
 621         for_each_string_list_item(item, submodules)
 622                 sha1_array_clear((struct sha1_array *) item->util);
 623         string_list_clear(submodules, 1);
 624 }
 625
 626 int find_unpushed_submodules(struct sha1_array *commits,
 627                 const char *remotes_name, struct string_list *needs_pushing)
 628 {
 629         struct rev_info rev;
 630         struct commit *commit;
 631         struct string_list submodules = STRING_LIST_INIT_DUP;
 632         struct string_list_item *submodule;
 633         struct argv_array argv = ARGV_ARRAY_INIT;
 634
 635         init_revisions(&rev, NULL);
 636
 637         /* argv.argv[0] will be ignored by setup_revisions */
 638         argv_array_push(&argv, "find_unpushed_submodules");
 639         sha1_array_for_each_unique(commits, append_sha1_to_argv, &argv);
 640         argv_array_push(&argv, "--not");
 641         argv_array_pushf(&argv, "--remotes=%s", remotes_name);
 642
 643         setup_revisions(argv.argc, argv.argv, &rev, NULL);
 644         if (prepare_revision_walk(&rev))
 645                 die("revision walk setup failed");
 646
 647         while ((commit = get_revision(&rev)) != NULL)
 648                 find_unpushed_submodule_commits(commit, &submodules);
 649
 650         reset_revision_walk();
 651         argv_array_clear(&argv);
 652
 653         for_each_string_list_item(submodule, &submodules) {
 654                 struct sha1_array *commits = (struct sha1_array *) submodule->util;
 655
 656                 if (submodule_needs_pushing(submodule->string, commits))
 657                         string_list_insert(needs_pushing, submodule->string);
 658         }
 659         free_submodules_sha1s(&submodules);
 660
 661         return needs_pushing->nr;
 662 }
 663
 664 static int push_submodule(const char *path)
 665 {
 666         if (add_submodule_odb(path))
 667                 return 1;
 668
 669         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 670                 struct child_process cp = CHILD_PROCESS_INIT;
 671                 const char *argv[] = {"push", NULL};
 672
 673                 cp.argv = argv;
 674                 prepare_submodule_repo_env(&cp.env_array);
 675                 cp.git_cmd = 1;
 676                 cp.no_stdin = 1;
 677                 cp.dir = path;
 678                 if (run_command(&cp))
 679                         return 0;
 680                 close(cp.out);
 681         }
 682
 683         return 1;
 684 }
 685
 686 int push_unpushed_submodules(struct sha1_array *commits, const char *remotes_name)
 687 {
 688         int i, ret = 1;
 689         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 690
 691         if (!find_unpushed_submodules(commits, remotes_name, &needs_pushing))
 692                 return 1;
 693
 694         for (i = 0; i < needs_pushing.nr; i++) {
 695                 const char *path = needs_pushing.items[i].string;
 696                 fprintf(stderr, "Pushing submodule '%s'\n", path);
 697                 if (!push_submodule(path)) {
 698                         fprintf(stderr, "Unable to push submodule '%s'\n", path);
 699                         ret = 0;
 700                 }
 701         }
 702
 703         string_list_clear(&needs_pushing, 0);
 704
 705         return ret;
 706 }
 707
 708 static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
 709 {
 710         int is_present = 0;
 711         if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
 712                 /* Even if the submodule is checked out and the commit is
 713                  * present, make sure it is reachable from a ref. */
 714                 struct child_process cp = CHILD_PROCESS_INIT;
 715                 const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
 716                 struct strbuf buf = STRBUF_INIT;
 717
 718                 argv[3] = sha1_to_hex(sha1);
 719                 cp.argv = argv;
 720                 prepare_submodule_repo_env(&cp.env_array);
 721                 cp.git_cmd = 1;
 722                 cp.no_stdin = 1;
 723                 cp.dir = path;
 724                 if (!capture_command(&cp, &buf, 1024) && !buf.len)
 725                         is_present = 1;
 726
 727                 strbuf_release(&buf);
 728         }
 729         return is_present;
 730 }
 731
 732 static void submodule_collect_changed_cb(struct diff_queue_struct *q,
 733                                          struct diff_options *options,
 734                                          void *data)
 735 {
 736         int i;
 737         for (i = 0; i < q->nr; i++) {
 738                 struct diff_filepair *p = q->queue[i];
 739                 if (!S_ISGITLINK(p->two->mode))
 740                         continue;
 741
 742                 if (S_ISGITLINK(p->one->mode)) {
 743                         /* NEEDSWORK: We should honor the name configured in
 744                          * the .gitmodules file of the commit we are examining
 745                          * here to be able to correctly follow submodules
 746                          * being moved around. */
 747                         struct string_list_item *path;
 748                         path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
 749                         if (!path && !is_submodule_commit_present(p->two->path, p->two->oid.hash))
 750                                 string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
 751                 } else {
 752                         /* Submodule is new or was moved here */
 753                         /* NEEDSWORK: When the .git directories of submodules
 754                          * live inside the superprojects .git directory some
 755                          * day we should fetch new submodules directly into
 756                          * that location too when config or options request
 757                          * that so they can be checked out from there. */
 758                         continue;
 759                 }
 760         }
 761 }
 762
 763 static int add_sha1_to_array(const char *ref, const struct object_id *oid,
 764                              int flags, void *data)
 765 {
 766         sha1_array_append(data, oid->hash);
 767         return 0;
 768 }
 769
 770 void check_for_new_submodule_commits(unsigned char new_sha1[20])
 771 {
 772         if (!initialized_fetch_ref_tips) {
 773                 for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
 774                 initialized_fetch_ref_tips = 1;
 775         }
 776
 777         sha1_array_append(&ref_tips_after_fetch, new_sha1);
 778 }
 779
 780 static int add_sha1_to_argv(const unsigned char sha1[20], void *data)
 781 {
 782         argv_array_push(data, sha1_to_hex(sha1));
 783         return 0;
 784 }
 785
 786 static void calculate_changed_submodule_paths(void)
 787 {
 788         struct rev_info rev;
 789         struct commit *commit;
 790         struct argv_array argv = ARGV_ARRAY_INIT;
 791
 792         /* No need to check if there are no submodules configured */
 793         if (!submodule_from_path(NULL, NULL))
 794                 return;
 795
 796         init_revisions(&rev, NULL);
 797         argv_array_push(&argv, "--"); /* argv[0] program name */
 798         sha1_array_for_each_unique(&ref_tips_after_fetch,
 799                                    add_sha1_to_argv, &argv);
 800         argv_array_push(&argv, "--not");
 801         sha1_array_for_each_unique(&ref_tips_before_fetch,
 802                                    add_sha1_to_argv, &argv);
 803         setup_revisions(argv.argc, argv.argv, &rev, NULL);
 804         if (prepare_revision_walk(&rev))
 805                 die("revision walk setup failed");
 806
 807         /*
 808          * Collect all submodules (whether checked out or not) for which new
 809          * commits have been recorded upstream in "changed_submodule_paths".
 810          */
 811         while ((commit = get_revision(&rev))) {
 812                 struct commit_list *parent = commit->parents;
 813                 while (parent) {
 814                         struct diff_options diff_opts;
 815                         diff_setup(&diff_opts);
 816                         DIFF_OPT_SET(&diff_opts, RECURSIVE);
 817                         diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
 818                         diff_opts.format_callback = submodule_collect_changed_cb;
 819                         diff_setup_done(&diff_opts);
 820                         diff_tree_sha1(parent->item->object.oid.hash, commit->object.oid.hash, "", &diff_opts);
 821                         diffcore_std(&diff_opts);
 822                         diff_flush(&diff_opts);
 823                         parent = parent->next;
 824                 }
 825         }
 826
 827         argv_array_clear(&argv);
 828         sha1_array_clear(&ref_tips_before_fetch);
 829         sha1_array_clear(&ref_tips_after_fetch);
 830         initialized_fetch_ref_tips = 0;
 831 }
 832
 833 struct submodule_parallel_fetch {
 834         int count;
 835         struct argv_array args;
 836         const char *work_tree;
 837         const char *prefix;
 838         int command_line_option;
 839         int quiet;
 840         int result;
 841 };
 842 #define SPF_INIT {0, ARGV_ARRAY_INIT, NULL, NULL, 0, 0, 0}
 843
 844 static int get_next_submodule(struct child_process *cp,
 845                               struct strbuf *err, void *data, void **task_cb)
 846 {
 847         int ret = 0;
 848         struct submodule_parallel_fetch *spf = data;
 849
 850         for (; spf->count < active_nr; spf->count++) {
 851                 struct strbuf submodule_path = STRBUF_INIT;
 852                 struct strbuf submodule_git_dir = STRBUF_INIT;
 853                 struct strbuf submodule_prefix = STRBUF_INIT;
 854                 const struct cache_entry *ce = active_cache[spf->count];
 855                 const char *git_dir, *default_argv;
 856                 const struct submodule *submodule;
 857
 858                 if (!S_ISGITLINK(ce->ce_mode))
 859                         continue;
 860
 861                 submodule = submodule_from_path(null_sha1, ce->name);
 862                 if (!submodule)
 863                         submodule = submodule_from_name(null_sha1, ce->name);
 864
 865                 default_argv = "yes";
 866                 if (spf->command_line_option == RECURSE_SUBMODULES_DEFAULT) {
 867                         if (submodule &&
 868                             submodule->fetch_recurse !=
 869                                                 RECURSE_SUBMODULES_NONE) {
 870                                 if (submodule->fetch_recurse ==
 871                                                 RECURSE_SUBMODULES_OFF)
 872                                         continue;
 873                                 if (submodule->fetch_recurse ==
 874                                                 RECURSE_SUBMODULES_ON_DEMAND) {
 875                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 876                                                 continue;
 877                                         default_argv = "on-demand";
 878                                 }
 879                         } else {
 880                                 if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
 881                                     gitmodules_is_unmerged)
 882                                         continue;
 883                                 if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
 884                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 885                                                 continue;
 886                                         default_argv = "on-demand";
 887                                 }
 888                         }
 889                 } else if (spf->command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
 890                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 891                                 continue;
 892                         default_argv = "on-demand";
 893                 }
 894
 895                 strbuf_addf(&submodule_path, "%s/%s", spf->work_tree, ce->name);
 896                 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
 897                 strbuf_addf(&submodule_prefix, "%s%s/", spf->prefix, ce->name);
 898                 git_dir = read_gitfile(submodule_git_dir.buf);
 899                 if (!git_dir)
 900                         git_dir = submodule_git_dir.buf;
 901                 if (is_directory(git_dir)) {
 902                         child_process_init(cp);
 903                         cp->dir = strbuf_detach(&submodule_path, NULL);
 904                         prepare_submodule_repo_env(&cp->env_array);
 905                         cp->git_cmd = 1;
 906                         if (!spf->quiet)
 907                                 strbuf_addf(err, "Fetching submodule %s%s\n",
 908                                             spf->prefix, ce->name);
 909                         argv_array_init(&cp->args);
 910                         argv_array_pushv(&cp->args, spf->args.argv);
 911                         argv_array_push(&cp->args, default_argv);
 912                         argv_array_push(&cp->args, "--submodule-prefix");
 913                         argv_array_push(&cp->args, submodule_prefix.buf);
 914                         ret = 1;
 915                 }
 916                 strbuf_release(&submodule_path);
 917                 strbuf_release(&submodule_git_dir);
 918                 strbuf_release(&submodule_prefix);
 919                 if (ret) {
 920                         spf->count++;
 921                         return 1;
 922                 }
 923         }
 924         return 0;
 925 }
 926
 927 static int fetch_start_failure(struct strbuf *err,
 928                                void *cb, void *task_cb)
 929 {
 930         struct submodule_parallel_fetch *spf = cb;
 931
 932         spf->result = 1;
 933
 934         return 0;
 935 }
 936
 937 static int fetch_finish(int retvalue, struct strbuf *err,
 938                         void *cb, void *task_cb)
 939 {
 940         struct submodule_parallel_fetch *spf = cb;
 941
 942         if (retvalue)
 943                 spf->result = 1;
 944
 945         return 0;
 946 }
 947
 948 int fetch_populated_submodules(const struct argv_array *options,
 949                                const char *prefix, int command_line_option,
 950                                int quiet, int max_parallel_jobs)
 951 {
 952         int i;
 953         struct submodule_parallel_fetch spf = SPF_INIT;
 954
 955         spf.work_tree = get_git_work_tree();
 956         spf.command_line_option = command_line_option;
 957         spf.quiet = quiet;
 958         spf.prefix = prefix;
 959
 960         if (!spf.work_tree)
 961                 goto out;
 962
 963         if (read_cache() < 0)
 964                 die("index file corrupt");
 965
 966         argv_array_push(&spf.args, "fetch");
 967         for (i = 0; i < options->argc; i++)
 968                 argv_array_push(&spf.args, options->argv[i]);
 969         argv_array_push(&spf.args, "--recurse-submodules-default");
 970         /* default value, "--submodule-prefix" and its value are added later */
 971
 972         if (max_parallel_jobs < 0)
 973                 max_parallel_jobs = parallel_jobs;
 974
 975         calculate_changed_submodule_paths();
 976         run_processes_parallel(max_parallel_jobs,
 977                                get_next_submodule,
 978                                fetch_start_failure,
 979                                fetch_finish,
 980                                &spf);
 981
 982         argv_array_clear(&spf.args);
 983 out:
 984         string_list_clear(&changed_submodule_paths, 1);
 985         return spf.result;
 986 }
 987
 988 unsigned is_submodule_modified(const char *path, int ignore_untracked)
 989 {
 990         ssize_t len;
 991         struct child_process cp = CHILD_PROCESS_INIT;
 992         const char *argv[] = {
 993                 "status",
 994                 "--porcelain",
 995                 NULL,
 996                 NULL,
 997         };
 998         struct strbuf buf = STRBUF_INIT;
 999         unsigned dirty_submodule = 0;
1000         const char *line, *next_line;
1001         const char *git_dir;
1002
1003         strbuf_addf(&buf, "%s/.git", path);
1004         git_dir = read_gitfile(buf.buf);
1005         if (!git_dir)
1006                 git_dir = buf.buf;
1007         if (!is_directory(git_dir)) {
1008                 strbuf_release(&buf);
1009                 /* The submodule is not checked out, so it is not modified */
1010                 return 0;
1011
1012         }
1013         strbuf_reset(&buf);
1014
1015         if (ignore_untracked)
1016                 argv[2] = "-uno";
1017
1018         cp.argv = argv;
1019         prepare_submodule_repo_env(&cp.env_array);
1020         cp.git_cmd = 1;
1021         cp.no_stdin = 1;
1022         cp.out = -1;
1023         cp.dir = path;
1024         if (start_command(&cp))
1025                 die("Could not run 'git status --porcelain' in submodule %s", path);
1026
1027         len = strbuf_read(&buf, cp.out, 1024);
1028         line = buf.buf;
1029         while (len > 2) {
1030                 if ((line[0] == '?') && (line[1] == '?')) {
1031                         dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
1032                         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
1033                                 break;
1034                 } else {
1035                         dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
1036                         if (ignore_untracked ||
1037                             (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
1038                                 break;
1039                 }
1040                 next_line = strchr(line, '\n');
1041                 if (!next_line)
1042                         break;
1043                 next_line++;
1044                 len -= (next_line - line);
1045                 line = next_line;
1046         }
1047         close(cp.out);
1048
1049         if (finish_command(&cp))
1050                 die("'git status --porcelain' failed in submodule %s", path);
1051
1052         strbuf_release(&buf);
1053         return dirty_submodule;
1054 }
1055
1056 int submodule_uses_gitfile(const char *path)
1057 {
1058         struct child_process cp = CHILD_PROCESS_INIT;
1059         const char *argv[] = {
1060                 "submodule",
1061                 "foreach",
1062                 "--quiet",
1063                 "--recursive",
1064                 "test -f .git",
1065                 NULL,
1066         };
1067         struct strbuf buf = STRBUF_INIT;
1068         const char *git_dir;
1069
1070         strbuf_addf(&buf, "%s/.git", path);
1071         git_dir = read_gitfile(buf.buf);
1072         if (!git_dir) {
1073                 strbuf_release(&buf);
1074                 return 0;
1075         }
1076         strbuf_release(&buf);
1077
1078         /* Now test that all nested submodules use a gitfile too */
1079         cp.argv = argv;
1080         prepare_submodule_repo_env(&cp.env_array);
1081         cp.git_cmd = 1;
1082         cp.no_stdin = 1;
1083         cp.no_stderr = 1;
1084         cp.no_stdout = 1;
1085         cp.dir = path;
1086         if (run_command(&cp))
1087                 return 0;
1088
1089         return 1;
1090 }
1091
1092 int ok_to_remove_submodule(const char *path)
1093 {
1094         ssize_t len;
1095         struct child_process cp = CHILD_PROCESS_INIT;
1096         const char *argv[] = {
1097                 "status",
1098                 "--porcelain",
1099                 "-u",
1100                 "--ignore-submodules=none",
1101                 NULL,
1102         };
1103         struct strbuf buf = STRBUF_INIT;
1104         int ok_to_remove = 1;
1105
1106         if (!file_exists(path) || is_empty_dir(path))
1107                 return 1;
1108
1109         if (!submodule_uses_gitfile(path))
1110                 return 0;
1111
1112         cp.argv = argv;
1113         prepare_submodule_repo_env(&cp.env_array);
1114         cp.git_cmd = 1;
1115         cp.no_stdin = 1;
1116         cp.out = -1;
1117         cp.dir = path;
1118         if (start_command(&cp))
1119                 die("Could not run 'git status --porcelain -uall --ignore-submodules=none' in submodule %s", path);
1120
1121         len = strbuf_read(&buf, cp.out, 1024);
1122         if (len > 2)
1123                 ok_to_remove = 0;
1124         close(cp.out);
1125
1126         if (finish_command(&cp))
1127                 die("'git status --porcelain -uall --ignore-submodules=none' failed in submodule %s", path);
1128
1129         strbuf_release(&buf);
1130         return ok_to_remove;
1131 }
1132
1133 static int find_first_merges(struct object_array *result, const char *path,
1134                 struct commit *a, struct commit *b)
1135 {
1136         int i, j;
1137         struct object_array merges = OBJECT_ARRAY_INIT;
1138         struct commit *commit;
1139         int contains_another;
1140
1141         char merged_revision[42];
1142         const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
1143                                    "--all", merged_revision, NULL };
1144         struct rev_info revs;
1145         struct setup_revision_opt rev_opts;
1146
1147         memset(result, 0, sizeof(struct object_array));
1148         memset(&rev_opts, 0, sizeof(rev_opts));
1149
1150         /* get all revisions that merge commit a */
1151         snprintf(merged_revision, sizeof(merged_revision), "^%s",
1152                         oid_to_hex(&a->object.oid));
1153         init_revisions(&revs, NULL);
1154         rev_opts.submodule = path;
1155         setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
1156
1157         /* save all revisions from the above list that contain b */
1158         if (prepare_revision_walk(&revs))
1159                 die("revision walk setup failed");
1160         while ((commit = get_revision(&revs)) != NULL) {
1161                 struct object *o = &(commit->object);
1162                 if (in_merge_bases(b, commit))
1163                         add_object_array(o, NULL, &merges);
1164         }
1165         reset_revision_walk();
1166
1167         /* Now we've got all merges that contain a and b. Prune all
1168          * merges that contain another found merge and save them in
1169          * result.
1170          */
1171         for (i = 0; i < merges.nr; i++) {
1172                 struct commit *m1 = (struct commit *) merges.objects[i].item;
1173
1174                 contains_another = 0;
1175                 for (j = 0; j < merges.nr; j++) {
1176                         struct commit *m2 = (struct commit *) merges.objects[j].item;
1177                         if (i != j && in_merge_bases(m2, m1)) {
1178                                 contains_another = 1;
1179                                 break;
1180                         }
1181                 }
1182
1183                 if (!contains_another)
1184                         add_object_array(merges.objects[i].item, NULL, result);
1185         }
1186
1187         free(merges.objects);
1188         return result->nr;
1189 }
1190
1191 static void print_commit(struct commit *commit)
1192 {
1193         struct strbuf sb = STRBUF_INIT;
1194         struct pretty_print_context ctx = {0};
1195         ctx.date_mode.type = DATE_NORMAL;
1196         format_commit_message(commit, " %h: %m %s", &sb, &ctx);
1197         fprintf(stderr, "%s\n", sb.buf);
1198         strbuf_release(&sb);
1199 }
1200
1201 #define MERGE_WARNING(path, msg) \
1202         warning("Failed to merge submodule %s (%s)", path, msg);
1203
1204 int merge_submodule(unsigned char result[20], const char *path,
1205                     const unsigned char base[20], const unsigned char a[20],
1206                     const unsigned char b[20], int search)
1207 {
1208         struct commit *commit_base, *commit_a, *commit_b;
1209         int parent_count;
1210         struct object_array merges;
1211
1212         int i;
1213
1214         /* store a in result in case we fail */
1215         hashcpy(result, a);
1216
1217         /* we can not handle deletion conflicts */
1218         if (is_null_sha1(base))
1219                 return 0;
1220         if (is_null_sha1(a))
1221                 return 0;
1222         if (is_null_sha1(b))
1223                 return 0;
1224
1225         if (add_submodule_odb(path)) {
1226                 MERGE_WARNING(path, "not checked out");
1227                 return 0;
1228         }
1229
1230         if (!(commit_base = lookup_commit_reference(base)) ||
1231             !(commit_a = lookup_commit_reference(a)) ||
1232             !(commit_b = lookup_commit_reference(b))) {
1233                 MERGE_WARNING(path, "commits not present");
1234                 return 0;
1235         }
1236
1237         /* check whether both changes are forward */
1238         if (!in_merge_bases(commit_base, commit_a) ||
1239             !in_merge_bases(commit_base, commit_b)) {
1240                 MERGE_WARNING(path, "commits don't follow merge-base");
1241                 return 0;
1242         }
1243
1244         /* Case #1: a is contained in b or vice versa */
1245         if (in_merge_bases(commit_a, commit_b)) {
1246                 hashcpy(result, b);
1247                 return 1;
1248         }
1249         if (in_merge_bases(commit_b, commit_a)) {
1250                 hashcpy(result, a);
1251                 return 1;
1252         }
1253
1254         /*
1255          * Case #2: There are one or more merges that contain a and b in
1256          * the submodule. If there is only one, then present it as a
1257          * suggestion to the user, but leave it marked unmerged so the
1258          * user needs to confirm the resolution.
1259          */
1260
1261         /* Skip the search if makes no sense to the calling context.  */
1262         if (!search)
1263                 return 0;
1264
1265         /* find commit which merges them */
1266         parent_count = find_first_merges(&merges, path, commit_a, commit_b);
1267         switch (parent_count) {
1268         case 0:
1269                 MERGE_WARNING(path, "merge following commits not found");
1270                 break;
1271
1272         case 1:
1273                 MERGE_WARNING(path, "not fast-forward");
1274                 fprintf(stderr, "Found a possible merge resolution "
1275                                 "for the submodule:\n");
1276                 print_commit((struct commit *) merges.objects[0].item);
1277                 fprintf(stderr,
1278                         "If this is correct simply add it to the index "
1279                         "for example\n"
1280                         "by using:\n\n"
1281                         "  git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1282                         "which will accept this suggestion.\n",
1283                         oid_to_hex(&merges.objects[0].item->oid), path);
1284                 break;
1285
1286         default:
1287                 MERGE_WARNING(path, "multiple merges found");
1288                 for (i = 0; i < merges.nr; i++)
1289                         print_commit((struct commit *) merges.objects[i].item);
1290         }
1291
1292         free(merges.objects);
1293         return 0;
1294 }
1295
1296 /* Update gitfile and core.worktree setting to connect work tree and git dir */
1297 void connect_work_tree_and_git_dir(const char *work_tree, const char *git_dir)
1298 {
1299         struct strbuf file_name = STRBUF_INIT;
1300         struct strbuf rel_path = STRBUF_INIT;
1301         const char *real_work_tree = xstrdup(real_path(work_tree));
1302
1303         /* Update gitfile */
1304         strbuf_addf(&file_name, "%s/.git", work_tree);
1305         write_file(file_name.buf, "gitdir: %s",
1306                    relative_path(git_dir, real_work_tree, &rel_path));
1307
1308         /* Update core.worktree setting */
1309         strbuf_reset(&file_name);
1310         strbuf_addf(&file_name, "%s/config", git_dir);
1311         git_config_set_in_file(file_name.buf, "core.worktree",
1312                                relative_path(real_work_tree, git_dir,
1313                                              &rel_path));
1314
1315         strbuf_release(&file_name);
1316         strbuf_release(&rel_path);
1317         free((void *)real_work_tree);
1318 }
1319
1320 int parallel_submodules(void)
1321 {
1322         return parallel_jobs;
1323 }
1324
1325 void prepare_submodule_repo_env(struct argv_array *out)
1326 {
1327         const char * const *var;
1328
1329         for (var = local_repo_env; *var; var++) {
1330                 if (strcmp(*var, CONFIG_DATA_ENVIRONMENT))
1331                         argv_array_push(out, *var);
1332         }
1333         argv_array_push(out, "GIT_DIR=.git");
1334 }