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