submodule.c

   1 #include "cache.h"
   2 #include "submodule.h"
   3 #include "dir.h"
   4 #include "diff.h"
   5 #include "commit.h"
   6 #include "revision.h"
   7 #include "run-command.h"
   8 #include "diffcore.h"
   9 #include "refs.h"
  10 #include "string-list.h"
  11 #include "sha1-array.h"
  12 #include "argv-array.h"
  13 #include "blob.h"
  14
  15 static struct string_list config_name_for_path;
  16 static struct string_list config_fetch_recurse_submodules_for_name;
  17 static struct string_list config_ignore_for_name;
  18 static int config_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND;
  19 static struct string_list changed_submodule_paths;
  20 static int initialized_fetch_ref_tips;
  21 static struct sha1_array ref_tips_before_fetch;
  22 static struct sha1_array ref_tips_after_fetch;
  23
  24 /*
  25  * The following flag is set if the .gitmodules file is unmerged. We then
  26  * disable recursion for all submodules where .git/config doesn't have a
  27  * matching config entry because we can't guess what might be configured in
  28  * .gitmodules unless the user resolves the conflict. When a command line
  29  * option is given (which always overrides configuration) this flag will be
  30  * ignored.
  31  */
  32 static int gitmodules_is_unmerged;
  33
  34 /*
  35  * This flag is set if the .gitmodules file had unstaged modifications on
  36  * startup. This must be checked before allowing modifications to the
  37  * .gitmodules file with the intention to stage them later, because when
  38  * continuing we would stage the modifications the user didn't stage herself
  39  * too. That might change in a future version when we learn to stage the
  40  * changes we do ourselves without staging any previous modifications.
  41  */
  42 static int gitmodules_is_modified;
  43
  44
  45 int is_staging_gitmodules_ok(void)
  46 {
  47         return !gitmodules_is_modified;
  48 }
  49
  50 void stage_updated_gitmodules(void)
  51 {
  52         struct strbuf buf = STRBUF_INIT;
  53         struct stat st;
  54         int pos;
  55         struct cache_entry *ce;
  56         int namelen = strlen(".gitmodules");
  57
  58         pos = cache_name_pos(".gitmodules", namelen);
  59         if (pos < 0) {
  60                 warning(_("could not find .gitmodules in index"));
  61                 return;
  62         }
  63         ce = active_cache[pos];
  64         ce->ce_flags = namelen;
  65         if (strbuf_read_file(&buf, ".gitmodules", 0) < 0)
  66                 die(_("reading updated .gitmodules failed"));
  67         if (lstat(".gitmodules", &st) < 0)
  68                 die_errno(_("unable to stat updated .gitmodules"));
  69         fill_stat_cache_info(ce, &st);
  70         ce->ce_mode = ce_mode_from_stat(ce, st.st_mode);
  71         if (remove_cache_entry_at(pos) < 0)
  72                 die(_("unable to remove .gitmodules from index"));
  73         if (write_sha1_file(buf.buf, buf.len, blob_type, ce->sha1))
  74                 die(_("adding updated .gitmodules failed"));
  75         if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE))
  76                 die(_("staging updated .gitmodules failed"));
  77 }
  78
  79 static int add_submodule_odb(const char *path)
  80 {
  81         struct strbuf objects_directory = STRBUF_INIT;
  82         struct alternate_object_database *alt_odb;
  83         int ret = 0;
  84         const char *git_dir;
  85
  86         strbuf_addf(&objects_directory, "%s/.git", path);
  87         git_dir = read_gitfile(objects_directory.buf);
  88         if (git_dir) {
  89                 strbuf_reset(&objects_directory);
  90                 strbuf_addstr(&objects_directory, git_dir);
  91         }
  92         strbuf_addstr(&objects_directory, "/objects/");
  93         if (!is_directory(objects_directory.buf)) {
  94                 ret = -1;
  95                 goto done;
  96         }
  97         /* avoid adding it twice */
  98         for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
  99                 if (alt_odb->name - alt_odb->base == objects_directory.len &&
 100                                 !strncmp(alt_odb->base, objects_directory.buf,
 101                                         objects_directory.len))
 102                         goto done;
 103
 104         alt_odb = xmalloc(objects_directory.len + 42 + sizeof(*alt_odb));
 105         alt_odb->next = alt_odb_list;
 106         strcpy(alt_odb->base, objects_directory.buf);
 107         alt_odb->name = alt_odb->base + objects_directory.len;
 108         alt_odb->name[2] = '/';
 109         alt_odb->name[40] = '\0';
 110         alt_odb->name[41] = '\0';
 111         alt_odb_list = alt_odb;
 112
 113         /* add possible alternates from the submodule */
 114         read_info_alternates(objects_directory.buf, 0);
 115         prepare_alt_odb();
 116 done:
 117         strbuf_release(&objects_directory);
 118         return ret;
 119 }
 120
 121 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
 122                                              const char *path)
 123 {
 124         struct string_list_item *path_option, *ignore_option;
 125         path_option = unsorted_string_list_lookup(&config_name_for_path, path);
 126         if (path_option) {
 127                 ignore_option = unsorted_string_list_lookup(&config_ignore_for_name, path_option->util);
 128                 if (ignore_option)
 129                         handle_ignore_submodules_arg(diffopt, ignore_option->util);
 130                 else if (gitmodules_is_unmerged)
 131                         DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 132         }
 133 }
 134
 135 int submodule_config(const char *var, const char *value, void *cb)
 136 {
 137         if (!prefixcmp(var, "submodule."))
 138                 return parse_submodule_config_option(var, value);
 139         else if (!strcmp(var, "fetch.recursesubmodules")) {
 140                 config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
 141                 return 0;
 142         }
 143         return 0;
 144 }
 145
 146 void gitmodules_config(void)
 147 {
 148         const char *work_tree = get_git_work_tree();
 149         if (work_tree) {
 150                 struct strbuf gitmodules_path = STRBUF_INIT;
 151                 int pos;
 152                 strbuf_addstr(&gitmodules_path, work_tree);
 153                 strbuf_addstr(&gitmodules_path, "/.gitmodules");
 154                 if (read_cache() < 0)
 155                         die("index file corrupt");
 156                 pos = cache_name_pos(".gitmodules", 11);
 157                 if (pos < 0) { /* .gitmodules not found or isn't merged */
 158                         pos = -1 - pos;
 159                         if (active_nr > pos) {  /* there is a .gitmodules */
 160                                 const struct cache_entry *ce = active_cache[pos];
 161                                 if (ce_namelen(ce) == 11 &&
 162                                     !memcmp(ce->name, ".gitmodules", 11))
 163                                         gitmodules_is_unmerged = 1;
 164                         }
 165                 } else if (pos < active_nr) {
 166                         struct stat st;
 167                         if (lstat(".gitmodules", &st) == 0 &&
 168                             ce_match_stat(active_cache[pos], &st, 0) & DATA_CHANGED)
 169                                 gitmodules_is_modified = 1;
 170                 }
 171
 172                 if (!gitmodules_is_unmerged)
 173                         git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
 174                 strbuf_release(&gitmodules_path);
 175         }
 176 }
 177
 178 int parse_submodule_config_option(const char *var, const char *value)
 179 {
 180         struct string_list_item *config;
 181         const char *name, *key;
 182         int namelen;
 183
 184         if (parse_config_key(var, "submodule", &name, &namelen, &key) < 0 || !name)
 185                 return 0;
 186
 187         if (!strcmp(key, "path")) {
 188                 config = unsorted_string_list_lookup(&config_name_for_path, value);
 189                 if (config)
 190                         free(config->util);
 191                 else
 192                         config = string_list_append(&config_name_for_path, xstrdup(value));
 193                 config->util = xmemdupz(name, namelen);
 194         } else if (!strcmp(key, "fetchrecursesubmodules")) {
 195                 char *name_cstr = xmemdupz(name, namelen);
 196                 config = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name_cstr);
 197                 if (!config)
 198                         config = string_list_append(&config_fetch_recurse_submodules_for_name, name_cstr);
 199                 else
 200                         free(name_cstr);
 201                 config->util = (void *)(intptr_t)parse_fetch_recurse_submodules_arg(var, value);
 202         } else if (!strcmp(key, "ignore")) {
 203                 char *name_cstr;
 204
 205                 if (strcmp(value, "untracked") && strcmp(value, "dirty") &&
 206                     strcmp(value, "all") && strcmp(value, "none")) {
 207                         warning("Invalid parameter \"%s\" for config option \"submodule.%s.ignore\"", value, var);
 208                         return 0;
 209                 }
 210
 211                 name_cstr = xmemdupz(name, namelen);
 212                 config = unsorted_string_list_lookup(&config_ignore_for_name, name_cstr);
 213                 if (config) {
 214                         free(config->util);
 215                         free(name_cstr);
 216                 } else
 217                         config = string_list_append(&config_ignore_for_name, name_cstr);
 218                 config->util = xstrdup(value);
 219                 return 0;
 220         }
 221         return 0;
 222 }
 223
 224 void handle_ignore_submodules_arg(struct diff_options *diffopt,
 225                                   const char *arg)
 226 {
 227         DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
 228         DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 229         DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
 230
 231         if (!strcmp(arg, "all"))
 232                 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 233         else if (!strcmp(arg, "untracked"))
 234                 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 235         else if (!strcmp(arg, "dirty"))
 236                 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
 237         else if (strcmp(arg, "none"))
 238                 die("bad --ignore-submodules argument: %s", arg);
 239 }
 240
 241 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
 242                 struct commit *left, struct commit *right,
 243                 int *fast_forward, int *fast_backward)
 244 {
 245         struct commit_list *merge_bases, *list;
 246
 247         init_revisions(rev, NULL);
 248         setup_revisions(0, NULL, rev, NULL);
 249         rev->left_right = 1;
 250         rev->first_parent_only = 1;
 251         left->object.flags |= SYMMETRIC_LEFT;
 252         add_pending_object(rev, &left->object, path);
 253         add_pending_object(rev, &right->object, path);
 254         merge_bases = get_merge_bases(left, right, 1);
 255         if (merge_bases) {
 256                 if (merge_bases->item == left)
 257                         *fast_forward = 1;
 258                 else if (merge_bases->item == right)
 259                         *fast_backward = 1;
 260         }
 261         for (list = merge_bases; list; list = list->next) {
 262                 list->item->object.flags |= UNINTERESTING;
 263                 add_pending_object(rev, &list->item->object,
 264                         sha1_to_hex(list->item->object.sha1));
 265         }
 266         return prepare_revision_walk(rev);
 267 }
 268
 269 static void print_submodule_summary(struct rev_info *rev, FILE *f,
 270                 const char *line_prefix,
 271                 const char *del, const char *add, const char *reset)
 272 {
 273         static const char format[] = "  %m %s";
 274         struct strbuf sb = STRBUF_INIT;
 275         struct commit *commit;
 276
 277         while ((commit = get_revision(rev))) {
 278                 struct pretty_print_context ctx = {0};
 279                 ctx.date_mode = rev->date_mode;
 280                 ctx.output_encoding = get_log_output_encoding();
 281                 strbuf_setlen(&sb, 0);
 282                 strbuf_addstr(&sb, line_prefix);
 283                 if (commit->object.flags & SYMMETRIC_LEFT) {
 284                         if (del)
 285                                 strbuf_addstr(&sb, del);
 286                 }
 287                 else if (add)
 288                         strbuf_addstr(&sb, add);
 289                 format_commit_message(commit, format, &sb, &ctx);
 290                 if (reset)
 291                         strbuf_addstr(&sb, reset);
 292                 strbuf_addch(&sb, '\n');
 293                 fprintf(f, "%s", sb.buf);
 294         }
 295         strbuf_release(&sb);
 296 }
 297
 298 int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
 299 {
 300         switch (git_config_maybe_bool(opt, arg)) {
 301         case 1:
 302                 return RECURSE_SUBMODULES_ON;
 303         case 0:
 304                 return RECURSE_SUBMODULES_OFF;
 305         default:
 306                 if (!strcmp(arg, "on-demand"))
 307                         return RECURSE_SUBMODULES_ON_DEMAND;
 308                 die("bad %s argument: %s", opt, arg);
 309         }
 310 }
 311
 312 void show_submodule_summary(FILE *f, const char *path,
 313                 const char *line_prefix,
 314                 unsigned char one[20], unsigned char two[20],
 315                 unsigned dirty_submodule, const char *meta,
 316                 const char *del, const char *add, const char *reset)
 317 {
 318         struct rev_info rev;
 319         struct commit *left = NULL, *right = NULL;
 320         const char *message = NULL;
 321         struct strbuf sb = STRBUF_INIT;
 322         int fast_forward = 0, fast_backward = 0;
 323
 324         if (is_null_sha1(two))
 325                 message = "(submodule deleted)";
 326         else if (add_submodule_odb(path))
 327                 message = "(not checked out)";
 328         else if (is_null_sha1(one))
 329                 message = "(new submodule)";
 330         else if (!(left = lookup_commit_reference(one)) ||
 331                  !(right = lookup_commit_reference(two)))
 332                 message = "(commits not present)";
 333         else if (prepare_submodule_summary(&rev, path, left, right,
 334                                            &fast_forward, &fast_backward))
 335                 message = "(revision walker failed)";
 336
 337         if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
 338                 fprintf(f, "%sSubmodule %s contains untracked content\n",
 339                         line_prefix, path);
 340         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 341                 fprintf(f, "%sSubmodule %s contains modified content\n",
 342                         line_prefix, path);
 343
 344         if (!hashcmp(one, two)) {
 345                 strbuf_release(&sb);
 346                 return;
 347         }
 348
 349         strbuf_addf(&sb, "%s%sSubmodule %s %s..", line_prefix, meta, path,
 350                         find_unique_abbrev(one, DEFAULT_ABBREV));
 351         if (!fast_backward && !fast_forward)
 352                 strbuf_addch(&sb, '.');
 353         strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
 354         if (message)
 355                 strbuf_addf(&sb, " %s%s\n", message, reset);
 356         else
 357                 strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
 358         fwrite(sb.buf, sb.len, 1, f);
 359
 360         if (!message) /* only NULL if we succeeded in setting up the walk */
 361                 print_submodule_summary(&rev, f, line_prefix, del, add, reset);
 362         if (left)
 363                 clear_commit_marks(left, ~0);
 364         if (right)
 365                 clear_commit_marks(right, ~0);
 366
 367         strbuf_release(&sb);
 368 }
 369
 370 void set_config_fetch_recurse_submodules(int value)
 371 {
 372         config_fetch_recurse_submodules = value;
 373 }
 374
 375 static int has_remote(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 376 {
 377         return 1;
 378 }
 379
 380 static int submodule_needs_pushing(const char *path, const unsigned char sha1[20])
 381 {
 382         if (add_submodule_odb(path) || !lookup_commit_reference(sha1))
 383                 return 0;
 384
 385         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 386                 struct child_process cp;
 387                 const char *argv[] = {"rev-list", NULL, "--not", "--remotes", "-n", "1" , NULL};
 388                 struct strbuf buf = STRBUF_INIT;
 389                 int needs_pushing = 0;
 390
 391                 argv[1] = sha1_to_hex(sha1);
 392                 memset(&cp, 0, sizeof(cp));
 393                 cp.argv = argv;
 394                 cp.env = local_repo_env;
 395                 cp.git_cmd = 1;
 396                 cp.no_stdin = 1;
 397                 cp.out = -1;
 398                 cp.dir = path;
 399                 if (start_command(&cp))
 400                         die("Could not run 'git rev-list %s --not --remotes -n 1' command in submodule %s",
 401                                 sha1_to_hex(sha1), path);
 402                 if (strbuf_read(&buf, cp.out, 41))
 403                         needs_pushing = 1;
 404                 finish_command(&cp);
 405                 close(cp.out);
 406                 strbuf_release(&buf);
 407                 return needs_pushing;
 408         }
 409
 410         return 0;
 411 }
 412
 413 static void collect_submodules_from_diff(struct diff_queue_struct *q,
 414                                          struct diff_options *options,
 415                                          void *data)
 416 {
 417         int i;
 418         struct string_list *needs_pushing = data;
 419
 420         for (i = 0; i < q->nr; i++) {
 421                 struct diff_filepair *p = q->queue[i];
 422                 if (!S_ISGITLINK(p->two->mode))
 423                         continue;
 424                 if (submodule_needs_pushing(p->two->path, p->two->sha1))
 425                         string_list_insert(needs_pushing, p->two->path);
 426         }
 427 }
 428
 429 static void find_unpushed_submodule_commits(struct commit *commit,
 430                 struct string_list *needs_pushing)
 431 {
 432         struct rev_info rev;
 433
 434         init_revisions(&rev, NULL);
 435         rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
 436         rev.diffopt.format_callback = collect_submodules_from_diff;
 437         rev.diffopt.format_callback_data = needs_pushing;
 438         diff_tree_combined_merge(commit, 1, &rev);
 439 }
 440
 441 int find_unpushed_submodules(unsigned char new_sha1[20],
 442                 const char *remotes_name, struct string_list *needs_pushing)
 443 {
 444         struct rev_info rev;
 445         struct commit *commit;
 446         const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
 447         int argc = ARRAY_SIZE(argv) - 1;
 448         char *sha1_copy;
 449
 450         struct strbuf remotes_arg = STRBUF_INIT;
 451
 452         strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
 453         init_revisions(&rev, NULL);
 454         sha1_copy = xstrdup(sha1_to_hex(new_sha1));
 455         argv[1] = sha1_copy;
 456         argv[3] = remotes_arg.buf;
 457         setup_revisions(argc, argv, &rev, NULL);
 458         if (prepare_revision_walk(&rev))
 459                 die("revision walk setup failed");
 460
 461         while ((commit = get_revision(&rev)) != NULL)
 462                 find_unpushed_submodule_commits(commit, needs_pushing);
 463
 464         reset_revision_walk();
 465         free(sha1_copy);
 466         strbuf_release(&remotes_arg);
 467
 468         return needs_pushing->nr;
 469 }
 470
 471 static int push_submodule(const char *path)
 472 {
 473         if (add_submodule_odb(path))
 474                 return 1;
 475
 476         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 477                 struct child_process cp;
 478                 const char *argv[] = {"push", NULL};
 479
 480                 memset(&cp, 0, sizeof(cp));
 481                 cp.argv = argv;
 482                 cp.env = local_repo_env;
 483                 cp.git_cmd = 1;
 484                 cp.no_stdin = 1;
 485                 cp.dir = path;
 486                 if (run_command(&cp))
 487                         return 0;
 488                 close(cp.out);
 489         }
 490
 491         return 1;
 492 }
 493
 494 int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name)
 495 {
 496         int i, ret = 1;
 497         struct string_list needs_pushing;
 498
 499         memset(&needs_pushing, 0, sizeof(struct string_list));
 500         needs_pushing.strdup_strings = 1;
 501
 502         if (!find_unpushed_submodules(new_sha1, remotes_name, &needs_pushing))
 503                 return 1;
 504
 505         for (i = 0; i < needs_pushing.nr; i++) {
 506                 const char *path = needs_pushing.items[i].string;
 507                 fprintf(stderr, "Pushing submodule '%s'\n", path);
 508                 if (!push_submodule(path)) {
 509                         fprintf(stderr, "Unable to push submodule '%s'\n", path);
 510                         ret = 0;
 511                 }
 512         }
 513
 514         string_list_clear(&needs_pushing, 0);
 515
 516         return ret;
 517 }
 518
 519 static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
 520 {
 521         int is_present = 0;
 522         if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
 523                 /* Even if the submodule is checked out and the commit is
 524                  * present, make sure it is reachable from a ref. */
 525                 struct child_process cp;
 526                 const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
 527                 struct strbuf buf = STRBUF_INIT;
 528
 529                 argv[3] = sha1_to_hex(sha1);
 530                 memset(&cp, 0, sizeof(cp));
 531                 cp.argv = argv;
 532                 cp.env = local_repo_env;
 533                 cp.git_cmd = 1;
 534                 cp.no_stdin = 1;
 535                 cp.out = -1;
 536                 cp.dir = path;
 537                 if (!run_command(&cp) && !strbuf_read(&buf, cp.out, 1024))
 538                         is_present = 1;
 539
 540                 close(cp.out);
 541                 strbuf_release(&buf);
 542         }
 543         return is_present;
 544 }
 545
 546 static void submodule_collect_changed_cb(struct diff_queue_struct *q,
 547                                          struct diff_options *options,
 548                                          void *data)
 549 {
 550         int i;
 551         for (i = 0; i < q->nr; i++) {
 552                 struct diff_filepair *p = q->queue[i];
 553                 if (!S_ISGITLINK(p->two->mode))
 554                         continue;
 555
 556                 if (S_ISGITLINK(p->one->mode)) {
 557                         /* NEEDSWORK: We should honor the name configured in
 558                          * the .gitmodules file of the commit we are examining
 559                          * here to be able to correctly follow submodules
 560                          * being moved around. */
 561                         struct string_list_item *path;
 562                         path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
 563                         if (!path && !is_submodule_commit_present(p->two->path, p->two->sha1))
 564                                 string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
 565                 } else {
 566                         /* Submodule is new or was moved here */
 567                         /* NEEDSWORK: When the .git directories of submodules
 568                          * live inside the superprojects .git directory some
 569                          * day we should fetch new submodules directly into
 570                          * that location too when config or options request
 571                          * that so they can be checked out from there. */
 572                         continue;
 573                 }
 574         }
 575 }
 576
 577 static int add_sha1_to_array(const char *ref, const unsigned char *sha1,
 578                              int flags, void *data)
 579 {
 580         sha1_array_append(data, sha1);
 581         return 0;
 582 }
 583
 584 void check_for_new_submodule_commits(unsigned char new_sha1[20])
 585 {
 586         if (!initialized_fetch_ref_tips) {
 587                 for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
 588                 initialized_fetch_ref_tips = 1;
 589         }
 590
 591         sha1_array_append(&ref_tips_after_fetch, new_sha1);
 592 }
 593
 594 static void add_sha1_to_argv(const unsigned char sha1[20], void *data)
 595 {
 596         argv_array_push(data, sha1_to_hex(sha1));
 597 }
 598
 599 static void calculate_changed_submodule_paths(void)
 600 {
 601         struct rev_info rev;
 602         struct commit *commit;
 603         struct argv_array argv = ARGV_ARRAY_INIT;
 604
 605         /* No need to check if there are no submodules configured */
 606         if (!config_name_for_path.nr)
 607                 return;
 608
 609         init_revisions(&rev, NULL);
 610         argv_array_push(&argv, "--"); /* argv[0] program name */
 611         sha1_array_for_each_unique(&ref_tips_after_fetch,
 612                                    add_sha1_to_argv, &argv);
 613         argv_array_push(&argv, "--not");
 614         sha1_array_for_each_unique(&ref_tips_before_fetch,
 615                                    add_sha1_to_argv, &argv);
 616         setup_revisions(argv.argc, argv.argv, &rev, NULL);
 617         if (prepare_revision_walk(&rev))
 618                 die("revision walk setup failed");
 619
 620         /*
 621          * Collect all submodules (whether checked out or not) for which new
 622          * commits have been recorded upstream in "changed_submodule_paths".
 623          */
 624         while ((commit = get_revision(&rev))) {
 625                 struct commit_list *parent = commit->parents;
 626                 while (parent) {
 627                         struct diff_options diff_opts;
 628                         diff_setup(&diff_opts);
 629                         DIFF_OPT_SET(&diff_opts, RECURSIVE);
 630                         diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
 631                         diff_opts.format_callback = submodule_collect_changed_cb;
 632                         diff_setup_done(&diff_opts);
 633                         diff_tree_sha1(parent->item->object.sha1, commit->object.sha1, "", &diff_opts);
 634                         diffcore_std(&diff_opts);
 635                         diff_flush(&diff_opts);
 636                         parent = parent->next;
 637                 }
 638         }
 639
 640         argv_array_clear(&argv);
 641         sha1_array_clear(&ref_tips_before_fetch);
 642         sha1_array_clear(&ref_tips_after_fetch);
 643         initialized_fetch_ref_tips = 0;
 644 }
 645
 646 int fetch_populated_submodules(const struct argv_array *options,
 647                                const char *prefix, int command_line_option,
 648                                int quiet)
 649 {
 650         int i, result = 0;
 651         struct child_process cp;
 652         struct argv_array argv = ARGV_ARRAY_INIT;
 653         struct string_list_item *name_for_path;
 654         const char *work_tree = get_git_work_tree();
 655         if (!work_tree)
 656                 goto out;
 657
 658         if (read_cache() < 0)
 659                 die("index file corrupt");
 660
 661         argv_array_push(&argv, "fetch");
 662         for (i = 0; i < options->argc; i++)
 663                 argv_array_push(&argv, options->argv[i]);
 664         argv_array_push(&argv, "--recurse-submodules-default");
 665         /* default value, "--submodule-prefix" and its value are added later */
 666
 667         memset(&cp, 0, sizeof(cp));
 668         cp.env = local_repo_env;
 669         cp.git_cmd = 1;
 670         cp.no_stdin = 1;
 671
 672         calculate_changed_submodule_paths();
 673
 674         for (i = 0; i < active_nr; i++) {
 675                 struct strbuf submodule_path = STRBUF_INIT;
 676                 struct strbuf submodule_git_dir = STRBUF_INIT;
 677                 struct strbuf submodule_prefix = STRBUF_INIT;
 678                 struct cache_entry *ce = active_cache[i];
 679                 const char *git_dir, *name, *default_argv;
 680
 681                 if (!S_ISGITLINK(ce->ce_mode))
 682                         continue;
 683
 684                 name = ce->name;
 685                 name_for_path = unsorted_string_list_lookup(&config_name_for_path, ce->name);
 686                 if (name_for_path)
 687                         name = name_for_path->util;
 688
 689                 default_argv = "yes";
 690                 if (command_line_option == RECURSE_SUBMODULES_DEFAULT) {
 691                         struct string_list_item *fetch_recurse_submodules_option;
 692                         fetch_recurse_submodules_option = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name);
 693                         if (fetch_recurse_submodules_option) {
 694                                 if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_OFF)
 695                                         continue;
 696                                 if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_ON_DEMAND) {
 697                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 698                                                 continue;
 699                                         default_argv = "on-demand";
 700                                 }
 701                         } else {
 702                                 if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
 703                                     gitmodules_is_unmerged)
 704                                         continue;
 705                                 if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
 706                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 707                                                 continue;
 708                                         default_argv = "on-demand";
 709                                 }
 710                         }
 711                 } else if (command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
 712                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 713                                 continue;
 714                         default_argv = "on-demand";
 715                 }
 716
 717                 strbuf_addf(&submodule_path, "%s/%s", work_tree, ce->name);
 718                 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
 719                 strbuf_addf(&submodule_prefix, "%s%s/", prefix, ce->name);
 720                 git_dir = read_gitfile(submodule_git_dir.buf);
 721                 if (!git_dir)
 722                         git_dir = submodule_git_dir.buf;
 723                 if (is_directory(git_dir)) {
 724                         if (!quiet)
 725                                 printf("Fetching submodule %s%s\n", prefix, ce->name);
 726                         cp.dir = submodule_path.buf;
 727                         argv_array_push(&argv, default_argv);
 728                         argv_array_push(&argv, "--submodule-prefix");
 729                         argv_array_push(&argv, submodule_prefix.buf);
 730                         cp.argv = argv.argv;
 731                         if (run_command(&cp))
 732                                 result = 1;
 733                         argv_array_pop(&argv);
 734                         argv_array_pop(&argv);
 735                         argv_array_pop(&argv);
 736                 }
 737                 strbuf_release(&submodule_path);
 738                 strbuf_release(&submodule_git_dir);
 739                 strbuf_release(&submodule_prefix);
 740         }
 741         argv_array_clear(&argv);
 742 out:
 743         string_list_clear(&changed_submodule_paths, 1);
 744         return result;
 745 }
 746
 747 unsigned is_submodule_modified(const char *path, int ignore_untracked)
 748 {
 749         ssize_t len;
 750         struct child_process cp;
 751         const char *argv[] = {
 752                 "status",
 753                 "--porcelain",
 754                 NULL,
 755                 NULL,
 756         };
 757         struct strbuf buf = STRBUF_INIT;
 758         unsigned dirty_submodule = 0;
 759         const char *line, *next_line;
 760         const char *git_dir;
 761
 762         strbuf_addf(&buf, "%s/.git", path);
 763         git_dir = read_gitfile(buf.buf);
 764         if (!git_dir)
 765                 git_dir = buf.buf;
 766         if (!is_directory(git_dir)) {
 767                 strbuf_release(&buf);
 768                 /* The submodule is not checked out, so it is not modified */
 769                 return 0;
 770
 771         }
 772         strbuf_reset(&buf);
 773
 774         if (ignore_untracked)
 775                 argv[2] = "-uno";
 776
 777         memset(&cp, 0, sizeof(cp));
 778         cp.argv = argv;
 779         cp.env = local_repo_env;
 780         cp.git_cmd = 1;
 781         cp.no_stdin = 1;
 782         cp.out = -1;
 783         cp.dir = path;
 784         if (start_command(&cp))
 785                 die("Could not run 'git status --porcelain' in submodule %s", path);
 786
 787         len = strbuf_read(&buf, cp.out, 1024);
 788         line = buf.buf;
 789         while (len > 2) {
 790                 if ((line[0] == '?') && (line[1] == '?')) {
 791                         dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
 792                         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 793                                 break;
 794                 } else {
 795                         dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
 796                         if (ignore_untracked ||
 797                             (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
 798                                 break;
 799                 }
 800                 next_line = strchr(line, '\n');
 801                 if (!next_line)
 802                         break;
 803                 next_line++;
 804                 len -= (next_line - line);
 805                 line = next_line;
 806         }
 807         close(cp.out);
 808
 809         if (finish_command(&cp))
 810                 die("'git status --porcelain' failed in submodule %s", path);
 811
 812         strbuf_release(&buf);
 813         return dirty_submodule;
 814 }
 815
 816 int submodule_uses_gitfile(const char *path)
 817 {
 818         struct child_process cp;
 819         const char *argv[] = {
 820                 "submodule",
 821                 "foreach",
 822                 "--quiet",
 823                 "--recursive",
 824                 "test -f .git",
 825                 NULL,
 826         };
 827         struct strbuf buf = STRBUF_INIT;
 828         const char *git_dir;
 829
 830         strbuf_addf(&buf, "%s/.git", path);
 831         git_dir = read_gitfile(buf.buf);
 832         if (!git_dir) {
 833                 strbuf_release(&buf);
 834                 return 0;
 835         }
 836         strbuf_release(&buf);
 837
 838         /* Now test that all nested submodules use a gitfile too */
 839         memset(&cp, 0, sizeof(cp));
 840         cp.argv = argv;
 841         cp.env = local_repo_env;
 842         cp.git_cmd = 1;
 843         cp.no_stdin = 1;
 844         cp.no_stderr = 1;
 845         cp.no_stdout = 1;
 846         cp.dir = path;
 847         if (run_command(&cp))
 848                 return 0;
 849
 850         return 1;
 851 }
 852
 853 int ok_to_remove_submodule(const char *path)
 854 {
 855         struct stat st;
 856         ssize_t len;
 857         struct child_process cp;
 858         const char *argv[] = {
 859                 "status",
 860                 "--porcelain",
 861                 "-u",
 862                 "--ignore-submodules=none",
 863                 NULL,
 864         };
 865         struct strbuf buf = STRBUF_INIT;
 866         int ok_to_remove = 1;
 867
 868         if ((lstat(path, &st) < 0) || is_empty_dir(path))
 869                 return 1;
 870
 871         if (!submodule_uses_gitfile(path))
 872                 return 0;
 873
 874         memset(&cp, 0, sizeof(cp));
 875         cp.argv = argv;
 876         cp.env = local_repo_env;
 877         cp.git_cmd = 1;
 878         cp.no_stdin = 1;
 879         cp.out = -1;
 880         cp.dir = path;
 881         if (start_command(&cp))
 882                 die("Could not run 'git status --porcelain -uall --ignore-submodules=none' in submodule %s", path);
 883
 884         len = strbuf_read(&buf, cp.out, 1024);
 885         if (len > 2)
 886                 ok_to_remove = 0;
 887         close(cp.out);
 888
 889         if (finish_command(&cp))
 890                 die("'git status --porcelain -uall --ignore-submodules=none' failed in submodule %s", path);
 891
 892         strbuf_release(&buf);
 893         return ok_to_remove;
 894 }
 895
 896 static int find_first_merges(struct object_array *result, const char *path,
 897                 struct commit *a, struct commit *b)
 898 {
 899         int i, j;
 900         struct object_array merges = OBJECT_ARRAY_INIT;
 901         struct commit *commit;
 902         int contains_another;
 903
 904         char merged_revision[42];
 905         const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
 906                                    "--all", merged_revision, NULL };
 907         struct rev_info revs;
 908         struct setup_revision_opt rev_opts;
 909
 910         memset(result, 0, sizeof(struct object_array));
 911         memset(&rev_opts, 0, sizeof(rev_opts));
 912
 913         /* get all revisions that merge commit a */
 914         snprintf(merged_revision, sizeof(merged_revision), "^%s",
 915                         sha1_to_hex(a->object.sha1));
 916         init_revisions(&revs, NULL);
 917         rev_opts.submodule = path;
 918         setup_revisions(sizeof(rev_args)/sizeof(char *)-1, rev_args, &revs, &rev_opts);
 919
 920         /* save all revisions from the above list that contain b */
 921         if (prepare_revision_walk(&revs))
 922                 die("revision walk setup failed");
 923         while ((commit = get_revision(&revs)) != NULL) {
 924                 struct object *o = &(commit->object);
 925                 if (in_merge_bases(b, commit))
 926                         add_object_array(o, NULL, &merges);
 927         }
 928         reset_revision_walk();
 929
 930         /* Now we've got all merges that contain a and b. Prune all
 931          * merges that contain another found merge and save them in
 932          * result.
 933          */
 934         for (i = 0; i < merges.nr; i++) {
 935                 struct commit *m1 = (struct commit *) merges.objects[i].item;
 936
 937                 contains_another = 0;
 938                 for (j = 0; j < merges.nr; j++) {
 939                         struct commit *m2 = (struct commit *) merges.objects[j].item;
 940                         if (i != j && in_merge_bases(m2, m1)) {
 941                                 contains_another = 1;
 942                                 break;
 943                         }
 944                 }
 945
 946                 if (!contains_another)
 947                         add_object_array(merges.objects[i].item, NULL, result);
 948         }
 949
 950         free(merges.objects);
 951         return result->nr;
 952 }
 953
 954 static void print_commit(struct commit *commit)
 955 {
 956         struct strbuf sb = STRBUF_INIT;
 957         struct pretty_print_context ctx = {0};
 958         ctx.date_mode = DATE_NORMAL;
 959         format_commit_message(commit, " %h: %m %s", &sb, &ctx);
 960         fprintf(stderr, "%s\n", sb.buf);
 961         strbuf_release(&sb);
 962 }
 963
 964 #define MERGE_WARNING(path, msg) \
 965         warning("Failed to merge submodule %s (%s)", path, msg);
 966
 967 int merge_submodule(unsigned char result[20], const char *path,
 968                     const unsigned char base[20], const unsigned char a[20],
 969                     const unsigned char b[20], int search)
 970 {
 971         struct commit *commit_base, *commit_a, *commit_b;
 972         int parent_count;
 973         struct object_array merges;
 974
 975         int i;
 976
 977         /* store a in result in case we fail */
 978         hashcpy(result, a);
 979
 980         /* we can not handle deletion conflicts */
 981         if (is_null_sha1(base))
 982                 return 0;
 983         if (is_null_sha1(a))
 984                 return 0;
 985         if (is_null_sha1(b))
 986                 return 0;
 987
 988         if (add_submodule_odb(path)) {
 989                 MERGE_WARNING(path, "not checked out");
 990                 return 0;
 991         }
 992
 993         if (!(commit_base = lookup_commit_reference(base)) ||
 994             !(commit_a = lookup_commit_reference(a)) ||
 995             !(commit_b = lookup_commit_reference(b))) {
 996                 MERGE_WARNING(path, "commits not present");
 997                 return 0;
 998         }
 999
1000         /* check whether both changes are forward */
1001         if (!in_merge_bases(commit_base, commit_a) ||
1002             !in_merge_bases(commit_base, commit_b)) {
1003                 MERGE_WARNING(path, "commits don't follow merge-base");
1004                 return 0;
1005         }
1006
1007         /* Case #1: a is contained in b or vice versa */
1008         if (in_merge_bases(commit_a, commit_b)) {
1009                 hashcpy(result, b);
1010                 return 1;
1011         }
1012         if (in_merge_bases(commit_b, commit_a)) {
1013                 hashcpy(result, a);
1014                 return 1;
1015         }
1016
1017         /*
1018          * Case #2: There are one or more merges that contain a and b in
1019          * the submodule. If there is only one, then present it as a
1020          * suggestion to the user, but leave it marked unmerged so the
1021          * user needs to confirm the resolution.
1022          */
1023
1024         /* Skip the search if makes no sense to the calling context.  */
1025         if (!search)
1026                 return 0;
1027
1028         /* find commit which merges them */
1029         parent_count = find_first_merges(&merges, path, commit_a, commit_b);
1030         switch (parent_count) {
1031         case 0:
1032                 MERGE_WARNING(path, "merge following commits not found");
1033                 break;
1034
1035         case 1:
1036                 MERGE_WARNING(path, "not fast-forward");
1037                 fprintf(stderr, "Found a possible merge resolution "
1038                                 "for the submodule:\n");
1039                 print_commit((struct commit *) merges.objects[0].item);
1040                 fprintf(stderr,
1041                         "If this is correct simply add it to the index "
1042                         "for example\n"
1043                         "by using:\n\n"
1044                         "  git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1045                         "which will accept this suggestion.\n",
1046                         sha1_to_hex(merges.objects[0].item->sha1), path);
1047                 break;
1048
1049         default:
1050                 MERGE_WARNING(path, "multiple merges found");
1051                 for (i = 0; i < merges.nr; i++)
1052                         print_commit((struct commit *) merges.objects[i].item);
1053         }
1054
1055         free(merges.objects);
1056         return 0;
1057 }
1058
1059 /* Update gitfile and core.worktree setting to connect work tree and git dir */
1060 void connect_work_tree_and_git_dir(const char *work_tree, const char *git_dir)
1061 {
1062         struct strbuf file_name = STRBUF_INIT;
1063         struct strbuf rel_path = STRBUF_INIT;
1064         const char *real_work_tree = xstrdup(real_path(work_tree));
1065         FILE *fp;
1066
1067         /* Update gitfile */
1068         strbuf_addf(&file_name, "%s/.git", work_tree);
1069         fp = fopen(file_name.buf, "w");
1070         if (!fp)
1071                 die(_("Could not create git link %s"), file_name.buf);
1072         fprintf(fp, "gitdir: %s\n", relative_path(git_dir, real_work_tree,
1073                                                   &rel_path));
1074         fclose(fp);
1075
1076         /* Update core.worktree setting */
1077         strbuf_reset(&file_name);
1078         strbuf_addf(&file_name, "%s/config", git_dir);
1079         if (git_config_set_in_file(file_name.buf, "core.worktree",
1080                                    relative_path(real_work_tree, git_dir,
1081                                                  &rel_path)))
1082                 die(_("Could not set core.worktree in %s"),
1083                     file_name.buf);
1084
1085         strbuf_release(&file_name);
1086         strbuf_release(&rel_path);
1087         free((void *)real_work_tree);
1088 }