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