submodule.c

   1 #include "cache.h"
   2 #include "submodule-config.h"
   3 #include "submodule.h"
   4 #include "dir.h"
   5 #include "diff.h"
   6 #include "commit.h"
   7 #include "revision.h"
   8 #include "run-command.h"
   9 #include "diffcore.h"
  10 #include "refs.h"
  11 #include "string-list.h"
  12 #include "sha1-array.h"
  13 #include "argv-array.h"
  14 #include "blob.h"
  15
  16 static int config_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND;
  17 static struct string_list changed_submodule_paths;
  18 static int initialized_fetch_ref_tips;
  19 static struct sha1_array ref_tips_before_fetch;
  20 static struct sha1_array ref_tips_after_fetch;
  21
  22 /*
  23  * The following flag is set if the .gitmodules file is unmerged. We then
  24  * disable recursion for all submodules where .git/config doesn't have a
  25  * matching config entry because we can't guess what might be configured in
  26  * .gitmodules unless the user resolves the conflict. When a command line
  27  * option is given (which always overrides configuration) this flag will be
  28  * ignored.
  29  */
  30 static int gitmodules_is_unmerged;
  31
  32 /*
  33  * This flag is set if the .gitmodules file had unstaged modifications on
  34  * startup. This must be checked before allowing modifications to the
  35  * .gitmodules file with the intention to stage them later, because when
  36  * continuing we would stage the modifications the user didn't stage herself
  37  * too. That might change in a future version when we learn to stage the
  38  * changes we do ourselves without staging any previous modifications.
  39  */
  40 static int gitmodules_is_modified;
  41
  42 int is_staging_gitmodules_ok(void)
  43 {
  44         return !gitmodules_is_modified;
  45 }
  46
  47 /*
  48  * Try to update the "path" entry in the "submodule.<name>" section of the
  49  * .gitmodules file. Return 0 only if a .gitmodules file was found, a section
  50  * with the correct path=<oldpath> setting was found and we could update it.
  51  */
  52 int update_path_in_gitmodules(const char *oldpath, const char *newpath)
  53 {
  54         struct strbuf entry = STRBUF_INIT;
  55         const struct submodule *submodule;
  56
  57         if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
  58                 return -1;
  59
  60         if (gitmodules_is_unmerged)
  61                 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
  62
  63         submodule = submodule_from_path(null_sha1, oldpath);
  64         if (!submodule || !submodule->name) {
  65                 warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
  66                 return -1;
  67         }
  68         strbuf_addstr(&entry, "submodule.");
  69         strbuf_addstr(&entry, submodule->name);
  70         strbuf_addstr(&entry, ".path");
  71         if (git_config_set_in_file(".gitmodules", entry.buf, newpath) < 0) {
  72                 /* Maybe the user already did that, don't error out here */
  73                 warning(_("Could not update .gitmodules entry %s"), entry.buf);
  74                 strbuf_release(&entry);
  75                 return -1;
  76         }
  77         strbuf_release(&entry);
  78         return 0;
  79 }
  80
  81 /*
  82  * Try to remove the "submodule.<name>" section from .gitmodules where the given
  83  * path is configured. Return 0 only if a .gitmodules file was found, a section
  84  * with the correct path=<path> setting was found and we could remove it.
  85  */
  86 int remove_path_from_gitmodules(const char *path)
  87 {
  88         struct strbuf sect = STRBUF_INIT;
  89         const struct submodule *submodule;
  90
  91         if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
  92                 return -1;
  93
  94         if (gitmodules_is_unmerged)
  95                 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
  96
  97         submodule = submodule_from_path(null_sha1, path);
  98         if (!submodule || !submodule->name) {
  99                 warning(_("Could not find section in .gitmodules where path=%s"), path);
 100                 return -1;
 101         }
 102         strbuf_addstr(&sect, "submodule.");
 103         strbuf_addstr(&sect, submodule->name);
 104         if (git_config_rename_section_in_file(".gitmodules", sect.buf, NULL) < 0) {
 105                 /* Maybe the user already did that, don't error out here */
 106                 warning(_("Could not remove .gitmodules entry for %s"), path);
 107                 strbuf_release(&sect);
 108                 return -1;
 109         }
 110         strbuf_release(&sect);
 111         return 0;
 112 }
 113
 114 void stage_updated_gitmodules(void)
 115 {
 116         if (add_file_to_cache(".gitmodules", 0))
 117                 die(_("staging updated .gitmodules failed"));
 118 }
 119
 120 static int add_submodule_odb(const char *path)
 121 {
 122         struct strbuf objects_directory = STRBUF_INIT;
 123         struct alternate_object_database *alt_odb;
 124         int ret = 0;
 125         const char *git_dir;
 126
 127         strbuf_addf(&objects_directory, "%s/.git", path);
 128         git_dir = read_gitfile(objects_directory.buf);
 129         if (git_dir) {
 130                 strbuf_reset(&objects_directory);
 131                 strbuf_addstr(&objects_directory, git_dir);
 132         }
 133         strbuf_addstr(&objects_directory, "/objects/");
 134         if (!is_directory(objects_directory.buf)) {
 135                 ret = -1;
 136                 goto done;
 137         }
 138         /* avoid adding it twice */
 139         for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
 140                 if (alt_odb->name - alt_odb->base == objects_directory.len &&
 141                                 !strncmp(alt_odb->base, objects_directory.buf,
 142                                         objects_directory.len))
 143                         goto done;
 144
 145         alt_odb = xmalloc(objects_directory.len + 42 + sizeof(*alt_odb));
 146         alt_odb->next = alt_odb_list;
 147         strcpy(alt_odb->base, objects_directory.buf);
 148         alt_odb->name = alt_odb->base + objects_directory.len;
 149         alt_odb->name[2] = '/';
 150         alt_odb->name[40] = '\0';
 151         alt_odb->name[41] = '\0';
 152         alt_odb_list = alt_odb;
 153
 154         /* add possible alternates from the submodule */
 155         read_info_alternates(objects_directory.buf, 0);
 156         prepare_alt_odb();
 157 done:
 158         strbuf_release(&objects_directory);
 159         return ret;
 160 }
 161
 162 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
 163                                              const char *path)
 164 {
 165         const struct submodule *submodule = submodule_from_path(null_sha1, path);
 166         if (submodule) {
 167                 if (submodule->ignore)
 168                         handle_ignore_submodules_arg(diffopt, submodule->ignore);
 169                 else if (gitmodules_is_unmerged)
 170                         DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 171         }
 172 }
 173
 174 int submodule_config(const char *var, const char *value, void *cb)
 175 {
 176         if (starts_with(var, "submodule."))
 177                 return parse_submodule_config_option(var, value);
 178         else if (!strcmp(var, "fetch.recursesubmodules")) {
 179                 config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
 180                 return 0;
 181         }
 182         return 0;
 183 }
 184
 185 void gitmodules_config(void)
 186 {
 187         const char *work_tree = get_git_work_tree();
 188         if (work_tree) {
 189                 struct strbuf gitmodules_path = STRBUF_INIT;
 190                 int pos;
 191                 strbuf_addstr(&gitmodules_path, work_tree);
 192                 strbuf_addstr(&gitmodules_path, "/.gitmodules");
 193                 if (read_cache() < 0)
 194                         die("index file corrupt");
 195                 pos = cache_name_pos(".gitmodules", 11);
 196                 if (pos < 0) { /* .gitmodules not found or isn't merged */
 197                         pos = -1 - pos;
 198                         if (active_nr > pos) {  /* there is a .gitmodules */
 199                                 const struct cache_entry *ce = active_cache[pos];
 200                                 if (ce_namelen(ce) == 11 &&
 201                                     !memcmp(ce->name, ".gitmodules", 11))
 202                                         gitmodules_is_unmerged = 1;
 203                         }
 204                 } else if (pos < active_nr) {
 205                         struct stat st;
 206                         if (lstat(".gitmodules", &st) == 0 &&
 207                             ce_match_stat(active_cache[pos], &st, 0) & DATA_CHANGED)
 208                                 gitmodules_is_modified = 1;
 209                 }
 210
 211                 if (!gitmodules_is_unmerged)
 212                         git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
 213                 strbuf_release(&gitmodules_path);
 214         }
 215 }
 216
 217 void handle_ignore_submodules_arg(struct diff_options *diffopt,
 218                                   const char *arg)
 219 {
 220         DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
 221         DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 222         DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
 223
 224         if (!strcmp(arg, "all"))
 225                 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 226         else if (!strcmp(arg, "untracked"))
 227                 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 228         else if (!strcmp(arg, "dirty"))
 229                 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
 230         else if (strcmp(arg, "none"))
 231                 die("bad --ignore-submodules argument: %s", arg);
 232 }
 233
 234 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
 235                 struct commit *left, struct commit *right,
 236                 int *fast_forward, int *fast_backward)
 237 {
 238         struct commit_list *merge_bases, *list;
 239
 240         init_revisions(rev, NULL);
 241         setup_revisions(0, NULL, rev, NULL);
 242         rev->left_right = 1;
 243         rev->first_parent_only = 1;
 244         left->object.flags |= SYMMETRIC_LEFT;
 245         add_pending_object(rev, &left->object, path);
 246         add_pending_object(rev, &right->object, path);
 247         merge_bases = get_merge_bases(left, right);
 248         if (merge_bases) {
 249                 if (merge_bases->item == left)
 250                         *fast_forward = 1;
 251                 else if (merge_bases->item == right)
 252                         *fast_backward = 1;
 253         }
 254         for (list = merge_bases; list; list = list->next) {
 255                 list->item->object.flags |= UNINTERESTING;
 256                 add_pending_object(rev, &list->item->object,
 257                         sha1_to_hex(list->item->object.sha1));
 258         }
 259         return prepare_revision_walk(rev);
 260 }
 261
 262 static void print_submodule_summary(struct rev_info *rev, FILE *f,
 263                 const char *line_prefix,
 264                 const char *del, const char *add, const char *reset)
 265 {
 266         static const char format[] = "  %m %s";
 267         struct strbuf sb = STRBUF_INIT;
 268         struct commit *commit;
 269
 270         while ((commit = get_revision(rev))) {
 271                 struct pretty_print_context ctx = {0};
 272                 ctx.date_mode = rev->date_mode;
 273                 ctx.output_encoding = get_log_output_encoding();
 274                 strbuf_setlen(&sb, 0);
 275                 strbuf_addstr(&sb, line_prefix);
 276                 if (commit->object.flags & SYMMETRIC_LEFT) {
 277                         if (del)
 278                                 strbuf_addstr(&sb, del);
 279                 }
 280                 else if (add)
 281                         strbuf_addstr(&sb, add);
 282                 format_commit_message(commit, format, &sb, &ctx);
 283                 if (reset)
 284                         strbuf_addstr(&sb, reset);
 285                 strbuf_addch(&sb, '\n');
 286                 fprintf(f, "%s", sb.buf);
 287         }
 288         strbuf_release(&sb);
 289 }
 290
 291 void show_submodule_summary(FILE *f, const char *path,
 292                 const char *line_prefix,
 293                 unsigned char one[20], unsigned char two[20],
 294                 unsigned dirty_submodule, const char *meta,
 295                 const char *del, const char *add, const char *reset)
 296 {
 297         struct rev_info rev;
 298         struct commit *left = NULL, *right = NULL;
 299         const char *message = NULL;
 300         struct strbuf sb = STRBUF_INIT;
 301         int fast_forward = 0, fast_backward = 0;
 302
 303         if (is_null_sha1(two))
 304                 message = "(submodule deleted)";
 305         else if (add_submodule_odb(path))
 306                 message = "(not checked out)";
 307         else if (is_null_sha1(one))
 308                 message = "(new submodule)";
 309         else if (!(left = lookup_commit_reference(one)) ||
 310                  !(right = lookup_commit_reference(two)))
 311                 message = "(commits not present)";
 312         else if (prepare_submodule_summary(&rev, path, left, right,
 313                                            &fast_forward, &fast_backward))
 314                 message = "(revision walker failed)";
 315
 316         if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
 317                 fprintf(f, "%sSubmodule %s contains untracked content\n",
 318                         line_prefix, path);
 319         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 320                 fprintf(f, "%sSubmodule %s contains modified content\n",
 321                         line_prefix, path);
 322
 323         if (!hashcmp(one, two)) {
 324                 strbuf_release(&sb);
 325                 return;
 326         }
 327
 328         strbuf_addf(&sb, "%s%sSubmodule %s %s..", line_prefix, meta, path,
 329                         find_unique_abbrev(one, DEFAULT_ABBREV));
 330         if (!fast_backward && !fast_forward)
 331                 strbuf_addch(&sb, '.');
 332         strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
 333         if (message)
 334                 strbuf_addf(&sb, " %s%s\n", message, reset);
 335         else
 336                 strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
 337         fwrite(sb.buf, sb.len, 1, f);
 338
 339         if (!message) /* only NULL if we succeeded in setting up the walk */
 340                 print_submodule_summary(&rev, f, line_prefix, del, add, reset);
 341         if (left)
 342                 clear_commit_marks(left, ~0);
 343         if (right)
 344                 clear_commit_marks(right, ~0);
 345
 346         strbuf_release(&sb);
 347 }
 348
 349 void set_config_fetch_recurse_submodules(int value)
 350 {
 351         config_fetch_recurse_submodules = value;
 352 }
 353
 354 static int has_remote(const char *refname, const struct object_id *oid,
 355                       int flags, void *cb_data)
 356 {
 357         return 1;
 358 }
 359
 360 static int submodule_needs_pushing(const char *path, const unsigned char sha1[20])
 361 {
 362         if (add_submodule_odb(path) || !lookup_commit_reference(sha1))
 363                 return 0;
 364
 365         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 366                 struct child_process cp = CHILD_PROCESS_INIT;
 367                 const char *argv[] = {"rev-list", NULL, "--not", "--remotes", "-n", "1" , NULL};
 368                 struct strbuf buf = STRBUF_INIT;
 369                 int needs_pushing = 0;
 370
 371                 argv[1] = sha1_to_hex(sha1);
 372                 cp.argv = argv;
 373                 cp.env = local_repo_env;
 374                 cp.git_cmd = 1;
 375                 cp.no_stdin = 1;
 376                 cp.out = -1;
 377                 cp.dir = path;
 378                 if (start_command(&cp))
 379                         die("Could not run 'git rev-list %s --not --remotes -n 1' command in submodule %s",
 380                                 sha1_to_hex(sha1), path);
 381                 if (strbuf_read(&buf, cp.out, 41))
 382                         needs_pushing = 1;
 383                 finish_command(&cp);
 384                 close(cp.out);
 385                 strbuf_release(&buf);
 386                 return needs_pushing;
 387         }
 388
 389         return 0;
 390 }
 391
 392 static void collect_submodules_from_diff(struct diff_queue_struct *q,
 393                                          struct diff_options *options,
 394                                          void *data)
 395 {
 396         int i;
 397         struct string_list *needs_pushing = data;
 398
 399         for (i = 0; i < q->nr; i++) {
 400                 struct diff_filepair *p = q->queue[i];
 401                 if (!S_ISGITLINK(p->two->mode))
 402                         continue;
 403                 if (submodule_needs_pushing(p->two->path, p->two->sha1))
 404                         string_list_insert(needs_pushing, p->two->path);
 405         }
 406 }
 407
 408 static void find_unpushed_submodule_commits(struct commit *commit,
 409                 struct string_list *needs_pushing)
 410 {
 411         struct rev_info rev;
 412
 413         init_revisions(&rev, NULL);
 414         rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
 415         rev.diffopt.format_callback = collect_submodules_from_diff;
 416         rev.diffopt.format_callback_data = needs_pushing;
 417         diff_tree_combined_merge(commit, 1, &rev);
 418 }
 419
 420 int find_unpushed_submodules(unsigned char new_sha1[20],
 421                 const char *remotes_name, struct string_list *needs_pushing)
 422 {
 423         struct rev_info rev;
 424         struct commit *commit;
 425         const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
 426         int argc = ARRAY_SIZE(argv) - 1;
 427         char *sha1_copy;
 428
 429         struct strbuf remotes_arg = STRBUF_INIT;
 430
 431         strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
 432         init_revisions(&rev, NULL);
 433         sha1_copy = xstrdup(sha1_to_hex(new_sha1));
 434         argv[1] = sha1_copy;
 435         argv[3] = remotes_arg.buf;
 436         setup_revisions(argc, argv, &rev, NULL);
 437         if (prepare_revision_walk(&rev))
 438                 die("revision walk setup failed");
 439
 440         while ((commit = get_revision(&rev)) != NULL)
 441                 find_unpushed_submodule_commits(commit, needs_pushing);
 442
 443         reset_revision_walk();
 444         free(sha1_copy);
 445         strbuf_release(&remotes_arg);
 446
 447         return needs_pushing->nr;
 448 }
 449
 450 static int push_submodule(const char *path)
 451 {
 452         if (add_submodule_odb(path))
 453                 return 1;
 454
 455         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 456                 struct child_process cp = CHILD_PROCESS_INIT;
 457                 const char *argv[] = {"push", NULL};
 458
 459                 cp.argv = argv;
 460                 cp.env = local_repo_env;
 461                 cp.git_cmd = 1;
 462                 cp.no_stdin = 1;
 463                 cp.dir = path;
 464                 if (run_command(&cp))
 465                         return 0;
 466                 close(cp.out);
 467         }
 468
 469         return 1;
 470 }
 471
 472 int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name)
 473 {
 474         int i, ret = 1;
 475         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 476
 477         if (!find_unpushed_submodules(new_sha1, remotes_name, &needs_pushing))
 478                 return 1;
 479
 480         for (i = 0; i < needs_pushing.nr; i++) {
 481                 const char *path = needs_pushing.items[i].string;
 482                 fprintf(stderr, "Pushing submodule '%s'\n", path);
 483                 if (!push_submodule(path)) {
 484                         fprintf(stderr, "Unable to push submodule '%s'\n", path);
 485                         ret = 0;
 486                 }
 487         }
 488
 489         string_list_clear(&needs_pushing, 0);
 490
 491         return ret;
 492 }
 493
 494 static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
 495 {
 496         int is_present = 0;
 497         if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
 498                 /* Even if the submodule is checked out and the commit is
 499                  * present, make sure it is reachable from a ref. */
 500                 struct child_process cp = CHILD_PROCESS_INIT;
 501                 const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
 502                 struct strbuf buf = STRBUF_INIT;
 503
 504                 argv[3] = sha1_to_hex(sha1);
 505                 cp.argv = argv;
 506                 cp.env = local_repo_env;
 507                 cp.git_cmd = 1;
 508                 cp.no_stdin = 1;
 509                 cp.dir = path;
 510                 if (!capture_command(&cp, &buf, 1024) && !buf.len)
 511                         is_present = 1;
 512
 513                 strbuf_release(&buf);
 514         }
 515         return is_present;
 516 }
 517
 518 static void submodule_collect_changed_cb(struct diff_queue_struct *q,
 519                                          struct diff_options *options,
 520                                          void *data)
 521 {
 522         int i;
 523         for (i = 0; i < q->nr; i++) {
 524                 struct diff_filepair *p = q->queue[i];
 525                 if (!S_ISGITLINK(p->two->mode))
 526                         continue;
 527
 528                 if (S_ISGITLINK(p->one->mode)) {
 529                         /* NEEDSWORK: We should honor the name configured in
 530                          * the .gitmodules file of the commit we are examining
 531                          * here to be able to correctly follow submodules
 532                          * being moved around. */
 533                         struct string_list_item *path;
 534                         path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
 535                         if (!path && !is_submodule_commit_present(p->two->path, p->two->sha1))
 536                                 string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
 537                 } else {
 538                         /* Submodule is new or was moved here */
 539                         /* NEEDSWORK: When the .git directories of submodules
 540                          * live inside the superprojects .git directory some
 541                          * day we should fetch new submodules directly into
 542                          * that location too when config or options request
 543                          * that so they can be checked out from there. */
 544                         continue;
 545                 }
 546         }
 547 }
 548
 549 static int add_sha1_to_array(const char *ref, const struct object_id *oid,
 550                              int flags, void *data)
 551 {
 552         sha1_array_append(data, oid->hash);
 553         return 0;
 554 }
 555
 556 void check_for_new_submodule_commits(unsigned char new_sha1[20])
 557 {
 558         if (!initialized_fetch_ref_tips) {
 559                 for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
 560                 initialized_fetch_ref_tips = 1;
 561         }
 562
 563         sha1_array_append(&ref_tips_after_fetch, new_sha1);
 564 }
 565
 566 static void add_sha1_to_argv(const unsigned char sha1[20], void *data)
 567 {
 568         argv_array_push(data, sha1_to_hex(sha1));
 569 }
 570
 571 static void calculate_changed_submodule_paths(void)
 572 {
 573         struct rev_info rev;
 574         struct commit *commit;
 575         struct argv_array argv = ARGV_ARRAY_INIT;
 576
 577         /* No need to check if there are no submodules configured */
 578         if (!submodule_from_path(NULL, NULL))
 579                 return;
 580
 581         init_revisions(&rev, NULL);
 582         argv_array_push(&argv, "--"); /* argv[0] program name */
 583         sha1_array_for_each_unique(&ref_tips_after_fetch,
 584                                    add_sha1_to_argv, &argv);
 585         argv_array_push(&argv, "--not");
 586         sha1_array_for_each_unique(&ref_tips_before_fetch,
 587                                    add_sha1_to_argv, &argv);
 588         setup_revisions(argv.argc, argv.argv, &rev, NULL);
 589         if (prepare_revision_walk(&rev))
 590                 die("revision walk setup failed");
 591
 592         /*
 593          * Collect all submodules (whether checked out or not) for which new
 594          * commits have been recorded upstream in "changed_submodule_paths".
 595          */
 596         while ((commit = get_revision(&rev))) {
 597                 struct commit_list *parent = commit->parents;
 598                 while (parent) {
 599                         struct diff_options diff_opts;
 600                         diff_setup(&diff_opts);
 601                         DIFF_OPT_SET(&diff_opts, RECURSIVE);
 602                         diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
 603                         diff_opts.format_callback = submodule_collect_changed_cb;
 604                         diff_setup_done(&diff_opts);
 605                         diff_tree_sha1(parent->item->object.sha1, commit->object.sha1, "", &diff_opts);
 606                         diffcore_std(&diff_opts);
 607                         diff_flush(&diff_opts);
 608                         parent = parent->next;
 609                 }
 610         }
 611
 612         argv_array_clear(&argv);
 613         sha1_array_clear(&ref_tips_before_fetch);
 614         sha1_array_clear(&ref_tips_after_fetch);
 615         initialized_fetch_ref_tips = 0;
 616 }
 617
 618 int fetch_populated_submodules(const struct argv_array *options,
 619                                const char *prefix, int command_line_option,
 620                                int quiet)
 621 {
 622         int i, result = 0;
 623         struct child_process cp = CHILD_PROCESS_INIT;
 624         struct argv_array argv = ARGV_ARRAY_INIT;
 625         const char *work_tree = get_git_work_tree();
 626         if (!work_tree)
 627                 goto out;
 628
 629         if (read_cache() < 0)
 630                 die("index file corrupt");
 631
 632         argv_array_push(&argv, "fetch");
 633         for (i = 0; i < options->argc; i++)
 634                 argv_array_push(&argv, options->argv[i]);
 635         argv_array_push(&argv, "--recurse-submodules-default");
 636         /* default value, "--submodule-prefix" and its value are added later */
 637
 638         cp.env = local_repo_env;
 639         cp.git_cmd = 1;
 640         cp.no_stdin = 1;
 641
 642         calculate_changed_submodule_paths();
 643
 644         for (i = 0; i < active_nr; i++) {
 645                 struct strbuf submodule_path = STRBUF_INIT;
 646                 struct strbuf submodule_git_dir = STRBUF_INIT;
 647                 struct strbuf submodule_prefix = STRBUF_INIT;
 648                 const struct cache_entry *ce = active_cache[i];
 649                 const char *git_dir, *default_argv;
 650                 const struct submodule *submodule;
 651
 652                 if (!S_ISGITLINK(ce->ce_mode))
 653                         continue;
 654
 655                 submodule = submodule_from_path(null_sha1, ce->name);
 656                 if (!submodule)
 657                         submodule = submodule_from_name(null_sha1, ce->name);
 658
 659                 default_argv = "yes";
 660                 if (command_line_option == RECURSE_SUBMODULES_DEFAULT) {
 661                         if (submodule &&
 662                             submodule->fetch_recurse !=
 663                                                 RECURSE_SUBMODULES_NONE) {
 664                                 if (submodule->fetch_recurse ==
 665                                                 RECURSE_SUBMODULES_OFF)
 666                                         continue;
 667                                 if (submodule->fetch_recurse ==
 668                                                 RECURSE_SUBMODULES_ON_DEMAND) {
 669                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 670                                                 continue;
 671                                         default_argv = "on-demand";
 672                                 }
 673                         } else {
 674                                 if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
 675                                     gitmodules_is_unmerged)
 676                                         continue;
 677                                 if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
 678                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 679                                                 continue;
 680                                         default_argv = "on-demand";
 681                                 }
 682                         }
 683                 } else if (command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
 684                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 685                                 continue;
 686                         default_argv = "on-demand";
 687                 }
 688
 689                 strbuf_addf(&submodule_path, "%s/%s", work_tree, ce->name);
 690                 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
 691                 strbuf_addf(&submodule_prefix, "%s%s/", prefix, ce->name);
 692                 git_dir = read_gitfile(submodule_git_dir.buf);
 693                 if (!git_dir)
 694                         git_dir = submodule_git_dir.buf;
 695                 if (is_directory(git_dir)) {
 696                         if (!quiet)
 697                                 printf("Fetching submodule %s%s\n", prefix, ce->name);
 698                         cp.dir = submodule_path.buf;
 699                         argv_array_push(&argv, default_argv);
 700                         argv_array_push(&argv, "--submodule-prefix");
 701                         argv_array_push(&argv, submodule_prefix.buf);
 702                         cp.argv = argv.argv;
 703                         if (run_command(&cp))
 704                                 result = 1;
 705                         argv_array_pop(&argv);
 706                         argv_array_pop(&argv);
 707                         argv_array_pop(&argv);
 708                 }
 709                 strbuf_release(&submodule_path);
 710                 strbuf_release(&submodule_git_dir);
 711                 strbuf_release(&submodule_prefix);
 712         }
 713         argv_array_clear(&argv);
 714 out:
 715         string_list_clear(&changed_submodule_paths, 1);
 716         return result;
 717 }
 718
 719 unsigned is_submodule_modified(const char *path, int ignore_untracked)
 720 {
 721         ssize_t len;
 722         struct child_process cp = CHILD_PROCESS_INIT;
 723         const char *argv[] = {
 724                 "status",
 725                 "--porcelain",
 726                 NULL,
 727                 NULL,
 728         };
 729         struct strbuf buf = STRBUF_INIT;
 730         unsigned dirty_submodule = 0;
 731         const char *line, *next_line;
 732         const char *git_dir;
 733
 734         strbuf_addf(&buf, "%s/.git", path);
 735         git_dir = read_gitfile(buf.buf);
 736         if (!git_dir)
 737                 git_dir = buf.buf;
 738         if (!is_directory(git_dir)) {
 739                 strbuf_release(&buf);
 740                 /* The submodule is not checked out, so it is not modified */
 741                 return 0;
 742
 743         }
 744         strbuf_reset(&buf);
 745
 746         if (ignore_untracked)
 747                 argv[2] = "-uno";
 748
 749         cp.argv = argv;
 750         cp.env = local_repo_env;
 751         cp.git_cmd = 1;
 752         cp.no_stdin = 1;
 753         cp.out = -1;
 754         cp.dir = path;
 755         if (start_command(&cp))
 756                 die("Could not run 'git status --porcelain' in submodule %s", path);
 757
 758         len = strbuf_read(&buf, cp.out, 1024);
 759         line = buf.buf;
 760         while (len > 2) {
 761                 if ((line[0] == '?') && (line[1] == '?')) {
 762                         dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
 763                         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 764                                 break;
 765                 } else {
 766                         dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
 767                         if (ignore_untracked ||
 768                             (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
 769                                 break;
 770                 }
 771                 next_line = strchr(line, '\n');
 772                 if (!next_line)
 773                         break;
 774                 next_line++;
 775                 len -= (next_line - line);
 776                 line = next_line;
 777         }
 778         close(cp.out);
 779
 780         if (finish_command(&cp))
 781                 die("'git status --porcelain' failed in submodule %s", path);
 782
 783         strbuf_release(&buf);
 784         return dirty_submodule;
 785 }
 786
 787 int submodule_uses_gitfile(const char *path)
 788 {
 789         struct child_process cp = CHILD_PROCESS_INIT;
 790         const char *argv[] = {
 791                 "submodule",
 792                 "foreach",
 793                 "--quiet",
 794                 "--recursive",
 795                 "test -f .git",
 796                 NULL,
 797         };
 798         struct strbuf buf = STRBUF_INIT;
 799         const char *git_dir;
 800
 801         strbuf_addf(&buf, "%s/.git", path);
 802         git_dir = read_gitfile(buf.buf);
 803         if (!git_dir) {
 804                 strbuf_release(&buf);
 805                 return 0;
 806         }
 807         strbuf_release(&buf);
 808
 809         /* Now test that all nested submodules use a gitfile too */
 810         cp.argv = argv;
 811         cp.env = local_repo_env;
 812         cp.git_cmd = 1;
 813         cp.no_stdin = 1;
 814         cp.no_stderr = 1;
 815         cp.no_stdout = 1;
 816         cp.dir = path;
 817         if (run_command(&cp))
 818                 return 0;
 819
 820         return 1;
 821 }
 822
 823 int ok_to_remove_submodule(const char *path)
 824 {
 825         ssize_t len;
 826         struct child_process cp = CHILD_PROCESS_INIT;
 827         const char *argv[] = {
 828                 "status",
 829                 "--porcelain",
 830                 "-u",
 831                 "--ignore-submodules=none",
 832                 NULL,
 833         };
 834         struct strbuf buf = STRBUF_INIT;
 835         int ok_to_remove = 1;
 836
 837         if (!file_exists(path) || is_empty_dir(path))
 838                 return 1;
 839
 840         if (!submodule_uses_gitfile(path))
 841                 return 0;
 842
 843         cp.argv = argv;
 844         cp.env = local_repo_env;
 845         cp.git_cmd = 1;
 846         cp.no_stdin = 1;
 847         cp.out = -1;
 848         cp.dir = path;
 849         if (start_command(&cp))
 850                 die("Could not run 'git status --porcelain -uall --ignore-submodules=none' in submodule %s", path);
 851
 852         len = strbuf_read(&buf, cp.out, 1024);
 853         if (len > 2)
 854                 ok_to_remove = 0;
 855         close(cp.out);
 856
 857         if (finish_command(&cp))
 858                 die("'git status --porcelain -uall --ignore-submodules=none' failed in submodule %s", path);
 859
 860         strbuf_release(&buf);
 861         return ok_to_remove;
 862 }
 863
 864 static int find_first_merges(struct object_array *result, const char *path,
 865                 struct commit *a, struct commit *b)
 866 {
 867         int i, j;
 868         struct object_array merges = OBJECT_ARRAY_INIT;
 869         struct commit *commit;
 870         int contains_another;
 871
 872         char merged_revision[42];
 873         const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
 874                                    "--all", merged_revision, NULL };
 875         struct rev_info revs;
 876         struct setup_revision_opt rev_opts;
 877
 878         memset(result, 0, sizeof(struct object_array));
 879         memset(&rev_opts, 0, sizeof(rev_opts));
 880
 881         /* get all revisions that merge commit a */
 882         snprintf(merged_revision, sizeof(merged_revision), "^%s",
 883                         sha1_to_hex(a->object.sha1));
 884         init_revisions(&revs, NULL);
 885         rev_opts.submodule = path;
 886         setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
 887
 888         /* save all revisions from the above list that contain b */
 889         if (prepare_revision_walk(&revs))
 890                 die("revision walk setup failed");
 891         while ((commit = get_revision(&revs)) != NULL) {
 892                 struct object *o = &(commit->object);
 893                 if (in_merge_bases(b, commit))
 894                         add_object_array(o, NULL, &merges);
 895         }
 896         reset_revision_walk();
 897
 898         /* Now we've got all merges that contain a and b. Prune all
 899          * merges that contain another found merge and save them in
 900          * result.
 901          */
 902         for (i = 0; i < merges.nr; i++) {
 903                 struct commit *m1 = (struct commit *) merges.objects[i].item;
 904
 905                 contains_another = 0;
 906                 for (j = 0; j < merges.nr; j++) {
 907                         struct commit *m2 = (struct commit *) merges.objects[j].item;
 908                         if (i != j && in_merge_bases(m2, m1)) {
 909                                 contains_another = 1;
 910                                 break;
 911                         }
 912                 }
 913
 914                 if (!contains_another)
 915                         add_object_array(merges.objects[i].item, NULL, result);
 916         }
 917
 918         free(merges.objects);
 919         return result->nr;
 920 }
 921
 922 static void print_commit(struct commit *commit)
 923 {
 924         struct strbuf sb = STRBUF_INIT;
 925         struct pretty_print_context ctx = {0};
 926         ctx.date_mode.type = DATE_NORMAL;
 927         format_commit_message(commit, " %h: %m %s", &sb, &ctx);
 928         fprintf(stderr, "%s\n", sb.buf);
 929         strbuf_release(&sb);
 930 }
 931
 932 #define MERGE_WARNING(path, msg) \
 933         warning("Failed to merge submodule %s (%s)", path, msg);
 934
 935 int merge_submodule(unsigned char result[20], const char *path,
 936                     const unsigned char base[20], const unsigned char a[20],
 937                     const unsigned char b[20], int search)
 938 {
 939         struct commit *commit_base, *commit_a, *commit_b;
 940         int parent_count;
 941         struct object_array merges;
 942
 943         int i;
 944
 945         /* store a in result in case we fail */
 946         hashcpy(result, a);
 947
 948         /* we can not handle deletion conflicts */
 949         if (is_null_sha1(base))
 950                 return 0;
 951         if (is_null_sha1(a))
 952                 return 0;
 953         if (is_null_sha1(b))
 954                 return 0;
 955
 956         if (add_submodule_odb(path)) {
 957                 MERGE_WARNING(path, "not checked out");
 958                 return 0;
 959         }
 960
 961         if (!(commit_base = lookup_commit_reference(base)) ||
 962             !(commit_a = lookup_commit_reference(a)) ||
 963             !(commit_b = lookup_commit_reference(b))) {
 964                 MERGE_WARNING(path, "commits not present");
 965                 return 0;
 966         }
 967
 968         /* check whether both changes are forward */
 969         if (!in_merge_bases(commit_base, commit_a) ||
 970             !in_merge_bases(commit_base, commit_b)) {
 971                 MERGE_WARNING(path, "commits don't follow merge-base");
 972                 return 0;
 973         }
 974
 975         /* Case #1: a is contained in b or vice versa */
 976         if (in_merge_bases(commit_a, commit_b)) {
 977                 hashcpy(result, b);
 978                 return 1;
 979         }
 980         if (in_merge_bases(commit_b, commit_a)) {
 981                 hashcpy(result, a);
 982                 return 1;
 983         }
 984
 985         /*
 986          * Case #2: There are one or more merges that contain a and b in
 987          * the submodule. If there is only one, then present it as a
 988          * suggestion to the user, but leave it marked unmerged so the
 989          * user needs to confirm the resolution.
 990          */
 991
 992         /* Skip the search if makes no sense to the calling context.  */
 993         if (!search)
 994                 return 0;
 995
 996         /* find commit which merges them */
 997         parent_count = find_first_merges(&merges, path, commit_a, commit_b);
 998         switch (parent_count) {
 999         case 0:
1000                 MERGE_WARNING(path, "merge following commits not found");
1001                 break;
1002
1003         case 1:
1004                 MERGE_WARNING(path, "not fast-forward");
1005                 fprintf(stderr, "Found a possible merge resolution "
1006                                 "for the submodule:\n");
1007                 print_commit((struct commit *) merges.objects[0].item);
1008                 fprintf(stderr,
1009                         "If this is correct simply add it to the index "
1010                         "for example\n"
1011                         "by using:\n\n"
1012                         "  git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1013                         "which will accept this suggestion.\n",
1014                         sha1_to_hex(merges.objects[0].item->sha1), path);
1015                 break;
1016
1017         default:
1018                 MERGE_WARNING(path, "multiple merges found");
1019                 for (i = 0; i < merges.nr; i++)
1020                         print_commit((struct commit *) merges.objects[i].item);
1021         }
1022
1023         free(merges.objects);
1024         return 0;
1025 }
1026
1027 /* Update gitfile and core.worktree setting to connect work tree and git dir */
1028 void connect_work_tree_and_git_dir(const char *work_tree, const char *git_dir)
1029 {
1030         struct strbuf file_name = STRBUF_INIT;
1031         struct strbuf rel_path = STRBUF_INIT;
1032         const char *real_work_tree = xstrdup(real_path(work_tree));
1033
1034         /* Update gitfile */
1035         strbuf_addf(&file_name, "%s/.git", work_tree);
1036         write_file(file_name.buf, "gitdir: %s",
1037                    relative_path(git_dir, real_work_tree, &rel_path));
1038
1039         /* Update core.worktree setting */
1040         strbuf_reset(&file_name);
1041         strbuf_addf(&file_name, "%s/config", git_dir);
1042         if (git_config_set_in_file(file_name.buf, "core.worktree",
1043                                    relative_path(real_work_tree, git_dir,
1044                                                  &rel_path)))
1045                 die(_("Could not set core.worktree in %s"),
1046                     file_name.buf);
1047
1048         strbuf_release(&file_name);
1049         strbuf_release(&rel_path);
1050         free((void *)real_work_tree);
1051 }