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