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 #include "thread-utils.h"
  16
  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 /*
  34  * This flag is set if the .gitmodules file had unstaged modifications on
  35  * startup. This must be checked before allowing modifications to the
  36  * .gitmodules file with the intention to stage them later, because when
  37  * continuing we would stage the modifications the user didn't stage herself
  38  * too. That might change in a future version when we learn to stage the
  39  * changes we do ourselves without staging any previous modifications.
  40  */
  41 static int gitmodules_is_modified;
  42
  43 int is_staging_gitmodules_ok(void)
  44 {
  45         return !gitmodules_is_modified;
  46 }
  47
  48 /*
  49  * Try to update the "path" entry in the "submodule.<name>" section of the
  50  * .gitmodules file. Return 0 only if a .gitmodules file was found, a section
  51  * with the correct path=<oldpath> setting was found and we could update it.
  52  */
  53 int update_path_in_gitmodules(const char *oldpath, const char *newpath)
  54 {
  55         struct strbuf entry = STRBUF_INIT;
  56         const struct submodule *submodule;
  57
  58         if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
  59                 return -1;
  60
  61         if (gitmodules_is_unmerged)
  62                 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
  63
  64         submodule = submodule_from_path(null_sha1, oldpath);
  65         if (!submodule || !submodule->name) {
  66                 warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
  67                 return -1;
  68         }
  69         strbuf_addstr(&entry, "submodule.");
  70         strbuf_addstr(&entry, submodule->name);
  71         strbuf_addstr(&entry, ".path");
  72         if (git_config_set_in_file_gently(".gitmodules", entry.buf, newpath) < 0) {
  73                 /* Maybe the user already did that, don't error out here */
  74                 warning(_("Could not update .gitmodules entry %s"), entry.buf);
  75                 strbuf_release(&entry);
  76                 return -1;
  77         }
  78         strbuf_release(&entry);
  79         return 0;
  80 }
  81
  82 /*
  83  * Try to remove the "submodule.<name>" section from .gitmodules where the given
  84  * path is configured. Return 0 only if a .gitmodules file was found, a section
  85  * with the correct path=<path> setting was found and we could remove it.
  86  */
  87 int remove_path_from_gitmodules(const char *path)
  88 {
  89         struct strbuf sect = STRBUF_INIT;
  90         const struct submodule *submodule;
  91
  92         if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
  93                 return -1;
  94
  95         if (gitmodules_is_unmerged)
  96                 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
  97
  98         submodule = submodule_from_path(null_sha1, path);
  99         if (!submodule || !submodule->name) {
 100                 warning(_("Could not find section in .gitmodules where path=%s"), path);
 101                 return -1;
 102         }
 103         strbuf_addstr(&sect, "submodule.");
 104         strbuf_addstr(&sect, submodule->name);
 105         if (git_config_rename_section_in_file(".gitmodules", sect.buf, NULL) < 0) {
 106                 /* Maybe the user already did that, don't error out here */
 107                 warning(_("Could not remove .gitmodules entry for %s"), path);
 108                 strbuf_release(&sect);
 109                 return -1;
 110         }
 111         strbuf_release(&sect);
 112         return 0;
 113 }
 114
 115 void stage_updated_gitmodules(void)
 116 {
 117         if (add_file_to_cache(".gitmodules", 0))
 118                 die(_("staging updated .gitmodules failed"));
 119 }
 120
 121 static int add_submodule_odb(const char *path)
 122 {
 123         struct strbuf objects_directory = STRBUF_INIT;
 124         struct alternate_object_database *alt_odb;
 125         int ret = 0;
 126         size_t alloc;
 127
 128         strbuf_git_path_submodule(&objects_directory, path, "objects/");
 129         if (!is_directory(objects_directory.buf)) {
 130                 ret = -1;
 131                 goto done;
 132         }
 133         /* avoid adding it twice */
 134         prepare_alt_odb();
 135         for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
 136                 if (alt_odb->name - alt_odb->base == objects_directory.len &&
 137                                 !strncmp(alt_odb->base, objects_directory.buf,
 138                                         objects_directory.len))
 139                         goto done;
 140
 141         alloc = st_add(objects_directory.len, 42); /* for "12/345..." sha1 */
 142         alt_odb = xmalloc(st_add(sizeof(*alt_odb), alloc));
 143         alt_odb->next = alt_odb_list;
 144         xsnprintf(alt_odb->base, alloc, "%s", objects_directory.buf);
 145         alt_odb->name = alt_odb->base + objects_directory.len;
 146         alt_odb->name[2] = '/';
 147         alt_odb->name[40] = '\0';
 148         alt_odb->name[41] = '\0';
 149         alt_odb_list = alt_odb;
 150
 151         /* add possible alternates from the submodule */
 152         read_info_alternates(objects_directory.buf, 0);
 153 done:
 154         strbuf_release(&objects_directory);
 155         return ret;
 156 }
 157
 158 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
 159                                              const char *path)
 160 {
 161         const struct submodule *submodule = submodule_from_path(null_sha1, path);
 162         if (submodule) {
 163                 if (submodule->ignore)
 164                         handle_ignore_submodules_arg(diffopt, submodule->ignore);
 165                 else if (gitmodules_is_unmerged)
 166                         DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 167         }
 168 }
 169
 170 int submodule_config(const char *var, const char *value, void *cb)
 171 {
 172         if (starts_with(var, "submodule."))
 173                 return parse_submodule_config_option(var, value);
 174         else if (!strcmp(var, "fetch.recursesubmodules")) {
 175                 config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
 176                 return 0;
 177         }
 178         return 0;
 179 }
 180
 181 void gitmodules_config(void)
 182 {
 183         const char *work_tree = get_git_work_tree();
 184         if (work_tree) {
 185                 struct strbuf gitmodules_path = STRBUF_INIT;
 186                 int pos;
 187                 strbuf_addstr(&gitmodules_path, work_tree);
 188                 strbuf_addstr(&gitmodules_path, "/.gitmodules");
 189                 if (read_cache() < 0)
 190                         die("index file corrupt");
 191                 pos = cache_name_pos(".gitmodules", 11);
 192                 if (pos < 0) { /* .gitmodules not found or isn't merged */
 193                         pos = -1 - pos;
 194                         if (active_nr > pos) {  /* there is a .gitmodules */
 195                                 const struct cache_entry *ce = active_cache[pos];
 196                                 if (ce_namelen(ce) == 11 &&
 197                                     !memcmp(ce->name, ".gitmodules", 11))
 198                                         gitmodules_is_unmerged = 1;
 199                         }
 200                 } else if (pos < active_nr) {
 201                         struct stat st;
 202                         if (lstat(".gitmodules", &st) == 0 &&
 203                             ce_match_stat(active_cache[pos], &st, 0) & DATA_CHANGED)
 204                                 gitmodules_is_modified = 1;
 205                 }
 206
 207                 if (!gitmodules_is_unmerged)
 208                         git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
 209                 strbuf_release(&gitmodules_path);
 210         }
 211 }
 212
 213 void handle_ignore_submodules_arg(struct diff_options *diffopt,
 214                                   const char *arg)
 215 {
 216         DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
 217         DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 218         DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
 219
 220         if (!strcmp(arg, "all"))
 221                 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 222         else if (!strcmp(arg, "untracked"))
 223                 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 224         else if (!strcmp(arg, "dirty"))
 225                 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
 226         else if (strcmp(arg, "none"))
 227                 die("bad --ignore-submodules argument: %s", arg);
 228 }
 229
 230 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
 231                 struct commit *left, struct commit *right,
 232                 int *fast_forward, int *fast_backward)
 233 {
 234         struct commit_list *merge_bases, *list;
 235
 236         init_revisions(rev, NULL);
 237         setup_revisions(0, NULL, rev, NULL);
 238         rev->left_right = 1;
 239         rev->first_parent_only = 1;
 240         left->object.flags |= SYMMETRIC_LEFT;
 241         add_pending_object(rev, &left->object, path);
 242         add_pending_object(rev, &right->object, path);
 243         merge_bases = get_merge_bases(left, right);
 244         if (merge_bases) {
 245                 if (merge_bases->item == left)
 246                         *fast_forward = 1;
 247                 else if (merge_bases->item == right)
 248                         *fast_backward = 1;
 249         }
 250         for (list = merge_bases; list; list = list->next) {
 251                 list->item->object.flags |= UNINTERESTING;
 252                 add_pending_object(rev, &list->item->object,
 253                         oid_to_hex(&list->item->object.oid));
 254         }
 255         return prepare_revision_walk(rev);
 256 }
 257
 258 static void print_submodule_summary(struct rev_info *rev, FILE *f,
 259                 const char *line_prefix,
 260                 const char *del, const char *add, const char *reset)
 261 {
 262         static const char format[] = "  %m %s";
 263         struct strbuf sb = STRBUF_INIT;
 264         struct commit *commit;
 265
 266         while ((commit = get_revision(rev))) {
 267                 struct pretty_print_context ctx = {0};
 268                 ctx.date_mode = rev->date_mode;
 269                 ctx.output_encoding = get_log_output_encoding();
 270                 strbuf_setlen(&sb, 0);
 271                 strbuf_addstr(&sb, line_prefix);
 272                 if (commit->object.flags & SYMMETRIC_LEFT) {
 273                         if (del)
 274                                 strbuf_addstr(&sb, del);
 275                 }
 276                 else if (add)
 277                         strbuf_addstr(&sb, add);
 278                 format_commit_message(commit, format, &sb, &ctx);
 279                 if (reset)
 280                         strbuf_addstr(&sb, reset);
 281                 strbuf_addch(&sb, '\n');
 282                 fprintf(f, "%s", sb.buf);
 283         }
 284         strbuf_release(&sb);
 285 }
 286
 287 void show_submodule_summary(FILE *f, const char *path,
 288                 const char *line_prefix,
 289                 unsigned char one[20], unsigned char two[20],
 290                 unsigned dirty_submodule, const char *meta,
 291                 const char *del, const char *add, const char *reset)
 292 {
 293         struct rev_info rev;
 294         struct commit *left = NULL, *right = NULL;
 295         const char *message = NULL;
 296         struct strbuf sb = STRBUF_INIT;
 297         int fast_forward = 0, fast_backward = 0;
 298
 299         if (is_null_sha1(two))
 300                 message = "(submodule deleted)";
 301         else if (add_submodule_odb(path))
 302                 message = "(not checked out)";
 303         else if (is_null_sha1(one))
 304                 message = "(new submodule)";
 305         else if (!(left = lookup_commit_reference(one)) ||
 306                  !(right = lookup_commit_reference(two)))
 307                 message = "(commits not present)";
 308         else if (prepare_submodule_summary(&rev, path, left, right,
 309                                            &fast_forward, &fast_backward))
 310                 message = "(revision walker failed)";
 311
 312         if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
 313                 fprintf(f, "%sSubmodule %s contains untracked content\n",
 314                         line_prefix, path);
 315         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 316                 fprintf(f, "%sSubmodule %s contains modified content\n",
 317                         line_prefix, path);
 318
 319         if (!hashcmp(one, two)) {
 320                 strbuf_release(&sb);
 321                 return;
 322         }
 323
 324         strbuf_addf(&sb, "%s%sSubmodule %s %s..", line_prefix, meta, path,
 325                         find_unique_abbrev(one, DEFAULT_ABBREV));
 326         if (!fast_backward && !fast_forward)
 327                 strbuf_addch(&sb, '.');
 328         strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
 329         if (message)
 330                 strbuf_addf(&sb, " %s%s\n", message, reset);
 331         else
 332                 strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
 333         fwrite(sb.buf, sb.len, 1, f);
 334
 335         if (!message) /* only NULL if we succeeded in setting up the walk */
 336                 print_submodule_summary(&rev, f, line_prefix, del, add, reset);
 337         if (left)
 338                 clear_commit_marks(left, ~0);
 339         if (right)
 340                 clear_commit_marks(right, ~0);
 341
 342         strbuf_release(&sb);
 343 }
 344
 345 void set_config_fetch_recurse_submodules(int value)
 346 {
 347         config_fetch_recurse_submodules = value;
 348 }
 349
 350 static int has_remote(const char *refname, const struct object_id *oid,
 351                       int flags, void *cb_data)
 352 {
 353         return 1;
 354 }
 355
 356 static int submodule_needs_pushing(const char *path, const unsigned char sha1[20])
 357 {
 358         if (add_submodule_odb(path) || !lookup_commit_reference(sha1))
 359                 return 0;
 360
 361         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 362                 struct child_process cp = CHILD_PROCESS_INIT;
 363                 const char *argv[] = {"rev-list", NULL, "--not", "--remotes", "-n", "1" , NULL};
 364                 struct strbuf buf = STRBUF_INIT;
 365                 int needs_pushing = 0;
 366
 367                 argv[1] = sha1_to_hex(sha1);
 368                 cp.argv = argv;
 369                 cp.env = local_repo_env;
 370                 cp.git_cmd = 1;
 371                 cp.no_stdin = 1;
 372                 cp.out = -1;
 373                 cp.dir = path;
 374                 if (start_command(&cp))
 375                         die("Could not run 'git rev-list %s --not --remotes -n 1' command in submodule %s",
 376                                 sha1_to_hex(sha1), path);
 377                 if (strbuf_read(&buf, cp.out, 41))
 378                         needs_pushing = 1;
 379                 finish_command(&cp);
 380                 close(cp.out);
 381                 strbuf_release(&buf);
 382                 return needs_pushing;
 383         }
 384
 385         return 0;
 386 }
 387
 388 static void collect_submodules_from_diff(struct diff_queue_struct *q,
 389                                          struct diff_options *options,
 390                                          void *data)
 391 {
 392         int i;
 393         struct string_list *needs_pushing = data;
 394
 395         for (i = 0; i < q->nr; i++) {
 396                 struct diff_filepair *p = q->queue[i];
 397                 if (!S_ISGITLINK(p->two->mode))
 398                         continue;
 399                 if (submodule_needs_pushing(p->two->path, p->two->sha1))
 400                         string_list_insert(needs_pushing, p->two->path);
 401         }
 402 }
 403
 404 static void find_unpushed_submodule_commits(struct commit *commit,
 405                 struct string_list *needs_pushing)
 406 {
 407         struct rev_info rev;
 408
 409         init_revisions(&rev, NULL);
 410         rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
 411         rev.diffopt.format_callback = collect_submodules_from_diff;
 412         rev.diffopt.format_callback_data = needs_pushing;
 413         diff_tree_combined_merge(commit, 1, &rev);
 414 }
 415
 416 int find_unpushed_submodules(unsigned char new_sha1[20],
 417                 const char *remotes_name, struct string_list *needs_pushing)
 418 {
 419         struct rev_info rev;
 420         struct commit *commit;
 421         const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
 422         int argc = ARRAY_SIZE(argv) - 1;
 423         char *sha1_copy;
 424
 425         struct strbuf remotes_arg = STRBUF_INIT;
 426
 427         strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
 428         init_revisions(&rev, NULL);
 429         sha1_copy = xstrdup(sha1_to_hex(new_sha1));
 430         argv[1] = sha1_copy;
 431         argv[3] = remotes_arg.buf;
 432         setup_revisions(argc, argv, &rev, NULL);
 433         if (prepare_revision_walk(&rev))
 434                 die("revision walk setup failed");
 435
 436         while ((commit = get_revision(&rev)) != NULL)
 437                 find_unpushed_submodule_commits(commit, needs_pushing);
 438
 439         reset_revision_walk();
 440         free(sha1_copy);
 441         strbuf_release(&remotes_arg);
 442
 443         return needs_pushing->nr;
 444 }
 445
 446 static int push_submodule(const char *path)
 447 {
 448         if (add_submodule_odb(path))
 449                 return 1;
 450
 451         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 452                 struct child_process cp = CHILD_PROCESS_INIT;
 453                 const char *argv[] = {"push", NULL};
 454
 455                 cp.argv = argv;
 456                 cp.env = local_repo_env;
 457                 cp.git_cmd = 1;
 458                 cp.no_stdin = 1;
 459                 cp.dir = path;
 460                 if (run_command(&cp))
 461                         return 0;
 462                 close(cp.out);
 463         }
 464
 465         return 1;
 466 }
 467
 468 int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name)
 469 {
 470         int i, ret = 1;
 471         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 472
 473         if (!find_unpushed_submodules(new_sha1, remotes_name, &needs_pushing))
 474                 return 1;
 475
 476         for (i = 0; i < needs_pushing.nr; i++) {
 477                 const char *path = needs_pushing.items[i].string;
 478                 fprintf(stderr, "Pushing submodule '%s'\n", path);
 479                 if (!push_submodule(path)) {
 480                         fprintf(stderr, "Unable to push submodule '%s'\n", path);
 481                         ret = 0;
 482                 }
 483         }
 484
 485         string_list_clear(&needs_pushing, 0);
 486
 487         return ret;
 488 }
 489
 490 static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
 491 {
 492         int is_present = 0;
 493         if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
 494                 /* Even if the submodule is checked out and the commit is
 495                  * present, make sure it is reachable from a ref. */
 496                 struct child_process cp = CHILD_PROCESS_INIT;
 497                 const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
 498                 struct strbuf buf = STRBUF_INIT;
 499
 500                 argv[3] = sha1_to_hex(sha1);
 501                 cp.argv = argv;
 502                 cp.env = local_repo_env;
 503                 cp.git_cmd = 1;
 504                 cp.no_stdin = 1;
 505                 cp.dir = path;
 506                 if (!capture_command(&cp, &buf, 1024) && !buf.len)
 507                         is_present = 1;
 508
 509                 strbuf_release(&buf);
 510         }
 511         return is_present;
 512 }
 513
 514 static void submodule_collect_changed_cb(struct diff_queue_struct *q,
 515                                          struct diff_options *options,
 516                                          void *data)
 517 {
 518         int i;
 519         for (i = 0; i < q->nr; i++) {
 520                 struct diff_filepair *p = q->queue[i];
 521                 if (!S_ISGITLINK(p->two->mode))
 522                         continue;
 523
 524                 if (S_ISGITLINK(p->one->mode)) {
 525                         /* NEEDSWORK: We should honor the name configured in
 526                          * the .gitmodules file of the commit we are examining
 527                          * here to be able to correctly follow submodules
 528                          * being moved around. */
 529                         struct string_list_item *path;
 530                         path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
 531                         if (!path && !is_submodule_commit_present(p->two->path, p->two->sha1))
 532                                 string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
 533                 } else {
 534                         /* Submodule is new or was moved here */
 535                         /* NEEDSWORK: When the .git directories of submodules
 536                          * live inside the superprojects .git directory some
 537                          * day we should fetch new submodules directly into
 538                          * that location too when config or options request
 539                          * that so they can be checked out from there. */
 540                         continue;
 541                 }
 542         }
 543 }
 544
 545 static int add_sha1_to_array(const char *ref, const struct object_id *oid,
 546                              int flags, void *data)
 547 {
 548         sha1_array_append(data, oid->hash);
 549         return 0;
 550 }
 551
 552 void check_for_new_submodule_commits(unsigned char new_sha1[20])
 553 {
 554         if (!initialized_fetch_ref_tips) {
 555                 for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
 556                 initialized_fetch_ref_tips = 1;
 557         }
 558
 559         sha1_array_append(&ref_tips_after_fetch, new_sha1);
 560 }
 561
 562 static void add_sha1_to_argv(const unsigned char sha1[20], void *data)
 563 {
 564         argv_array_push(data, sha1_to_hex(sha1));
 565 }
 566
 567 static void calculate_changed_submodule_paths(void)
 568 {
 569         struct rev_info rev;
 570         struct commit *commit;
 571         struct argv_array argv = ARGV_ARRAY_INIT;
 572
 573         /* No need to check if there are no submodules configured */
 574         if (!submodule_from_path(NULL, NULL))
 575                 return;
 576
 577         init_revisions(&rev, NULL);
 578         argv_array_push(&argv, "--"); /* argv[0] program name */
 579         sha1_array_for_each_unique(&ref_tips_after_fetch,
 580                                    add_sha1_to_argv, &argv);
 581         argv_array_push(&argv, "--not");
 582         sha1_array_for_each_unique(&ref_tips_before_fetch,
 583                                    add_sha1_to_argv, &argv);
 584         setup_revisions(argv.argc, argv.argv, &rev, NULL);
 585         if (prepare_revision_walk(&rev))
 586                 die("revision walk setup failed");
 587
 588         /*
 589          * Collect all submodules (whether checked out or not) for which new
 590          * commits have been recorded upstream in "changed_submodule_paths".
 591          */
 592         while ((commit = get_revision(&rev))) {
 593                 struct commit_list *parent = commit->parents;
 594                 while (parent) {
 595                         struct diff_options diff_opts;
 596                         diff_setup(&diff_opts);
 597                         DIFF_OPT_SET(&diff_opts, RECURSIVE);
 598                         diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
 599                         diff_opts.format_callback = submodule_collect_changed_cb;
 600                         diff_setup_done(&diff_opts);
 601                         diff_tree_sha1(parent->item->object.oid.hash, commit->object.oid.hash, "", &diff_opts);
 602                         diffcore_std(&diff_opts);
 603                         diff_flush(&diff_opts);
 604                         parent = parent->next;
 605                 }
 606         }
 607
 608         argv_array_clear(&argv);
 609         sha1_array_clear(&ref_tips_before_fetch);
 610         sha1_array_clear(&ref_tips_after_fetch);
 611         initialized_fetch_ref_tips = 0;
 612 }
 613
 614 struct submodule_parallel_fetch {
 615         int count;
 616         struct argv_array args;
 617         const char *work_tree;
 618         const char *prefix;
 619         int command_line_option;
 620         int quiet;
 621         int result;
 622 };
 623 #define SPF_INIT {0, ARGV_ARRAY_INIT, NULL, NULL, 0, 0, 0}
 624
 625 static int get_next_submodule(struct child_process *cp,
 626                               struct strbuf *err, void *data, void **task_cb)
 627 {
 628         int ret = 0;
 629         struct submodule_parallel_fetch *spf = data;
 630
 631         for (; spf->count < active_nr; spf->count++) {
 632                 struct strbuf submodule_path = STRBUF_INIT;
 633                 struct strbuf submodule_git_dir = STRBUF_INIT;
 634                 struct strbuf submodule_prefix = STRBUF_INIT;
 635                 const struct cache_entry *ce = active_cache[spf->count];
 636                 const char *git_dir, *default_argv;
 637                 const struct submodule *submodule;
 638
 639                 if (!S_ISGITLINK(ce->ce_mode))
 640                         continue;
 641
 642                 submodule = submodule_from_path(null_sha1, ce->name);
 643                 if (!submodule)
 644                         submodule = submodule_from_name(null_sha1, ce->name);
 645
 646                 default_argv = "yes";
 647                 if (spf->command_line_option == RECURSE_SUBMODULES_DEFAULT) {
 648                         if (submodule &&
 649                             submodule->fetch_recurse !=
 650                                                 RECURSE_SUBMODULES_NONE) {
 651                                 if (submodule->fetch_recurse ==
 652                                                 RECURSE_SUBMODULES_OFF)
 653                                         continue;
 654                                 if (submodule->fetch_recurse ==
 655                                                 RECURSE_SUBMODULES_ON_DEMAND) {
 656                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 657                                                 continue;
 658                                         default_argv = "on-demand";
 659                                 }
 660                         } else {
 661                                 if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
 662                                     gitmodules_is_unmerged)
 663                                         continue;
 664                                 if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
 665                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 666                                                 continue;
 667                                         default_argv = "on-demand";
 668                                 }
 669                         }
 670                 } else if (spf->command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
 671                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 672                                 continue;
 673                         default_argv = "on-demand";
 674                 }
 675
 676                 strbuf_addf(&submodule_path, "%s/%s", spf->work_tree, ce->name);
 677                 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
 678                 strbuf_addf(&submodule_prefix, "%s%s/", spf->prefix, ce->name);
 679                 git_dir = read_gitfile(submodule_git_dir.buf);
 680                 if (!git_dir)
 681                         git_dir = submodule_git_dir.buf;
 682                 if (is_directory(git_dir)) {
 683                         child_process_init(cp);
 684                         cp->dir = strbuf_detach(&submodule_path, NULL);
 685                         cp->env = local_repo_env;
 686                         cp->git_cmd = 1;
 687                         if (!spf->quiet)
 688                                 strbuf_addf(err, "Fetching submodule %s%s\n",
 689                                             spf->prefix, ce->name);
 690                         argv_array_init(&cp->args);
 691                         argv_array_pushv(&cp->args, spf->args.argv);
 692                         argv_array_push(&cp->args, default_argv);
 693                         argv_array_push(&cp->args, "--submodule-prefix");
 694                         argv_array_push(&cp->args, submodule_prefix.buf);
 695                         ret = 1;
 696                 }
 697                 strbuf_release(&submodule_path);
 698                 strbuf_release(&submodule_git_dir);
 699                 strbuf_release(&submodule_prefix);
 700                 if (ret) {
 701                         spf->count++;
 702                         return 1;
 703                 }
 704         }
 705         return 0;
 706 }
 707
 708 static int fetch_start_failure(struct strbuf *err,
 709                                void *cb, void *task_cb)
 710 {
 711         struct submodule_parallel_fetch *spf = cb;
 712
 713         spf->result = 1;
 714
 715         return 0;
 716 }
 717
 718 static int fetch_finish(int retvalue, struct strbuf *err,
 719                         void *cb, void *task_cb)
 720 {
 721         struct submodule_parallel_fetch *spf = cb;
 722
 723         if (retvalue)
 724                 spf->result = 1;
 725
 726         return 0;
 727 }
 728
 729 int fetch_populated_submodules(const struct argv_array *options,
 730                                const char *prefix, int command_line_option,
 731                                int quiet, int max_parallel_jobs)
 732 {
 733         int i;
 734         struct submodule_parallel_fetch spf = SPF_INIT;
 735
 736         spf.work_tree = get_git_work_tree();
 737         spf.command_line_option = command_line_option;
 738         spf.quiet = quiet;
 739         spf.prefix = prefix;
 740
 741         if (!spf.work_tree)
 742                 goto out;
 743
 744         if (read_cache() < 0)
 745                 die("index file corrupt");
 746
 747         argv_array_push(&spf.args, "fetch");
 748         for (i = 0; i < options->argc; i++)
 749                 argv_array_push(&spf.args, options->argv[i]);
 750         argv_array_push(&spf.args, "--recurse-submodules-default");
 751         /* default value, "--submodule-prefix" and its value are added later */
 752
 753         calculate_changed_submodule_paths();
 754         run_processes_parallel(max_parallel_jobs,
 755                                get_next_submodule,
 756                                fetch_start_failure,
 757                                fetch_finish,
 758                                &spf);
 759
 760         argv_array_clear(&spf.args);
 761 out:
 762         string_list_clear(&changed_submodule_paths, 1);
 763         return spf.result;
 764 }
 765
 766 unsigned is_submodule_modified(const char *path, int ignore_untracked)
 767 {
 768         ssize_t len;
 769         struct child_process cp = CHILD_PROCESS_INIT;
 770         const char *argv[] = {
 771                 "status",
 772                 "--porcelain",
 773                 NULL,
 774                 NULL,
 775         };
 776         struct strbuf buf = STRBUF_INIT;
 777         unsigned dirty_submodule = 0;
 778         const char *line, *next_line;
 779         const char *git_dir;
 780
 781         strbuf_addf(&buf, "%s/.git", path);
 782         git_dir = read_gitfile(buf.buf);
 783         if (!git_dir)
 784                 git_dir = buf.buf;
 785         if (!is_directory(git_dir)) {
 786                 strbuf_release(&buf);
 787                 /* The submodule is not checked out, so it is not modified */
 788                 return 0;
 789
 790         }
 791         strbuf_reset(&buf);
 792
 793         if (ignore_untracked)
 794                 argv[2] = "-uno";
 795
 796         cp.argv = argv;
 797         cp.env = local_repo_env;
 798         cp.git_cmd = 1;
 799         cp.no_stdin = 1;
 800         cp.out = -1;
 801         cp.dir = path;
 802         if (start_command(&cp))
 803                 die("Could not run 'git status --porcelain' in submodule %s", path);
 804
 805         len = strbuf_read(&buf, cp.out, 1024);
 806         line = buf.buf;
 807         while (len > 2) {
 808                 if ((line[0] == '?') && (line[1] == '?')) {
 809                         dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
 810                         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 811                                 break;
 812                 } else {
 813                         dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
 814                         if (ignore_untracked ||
 815                             (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
 816                                 break;
 817                 }
 818                 next_line = strchr(line, '\n');
 819                 if (!next_line)
 820                         break;
 821                 next_line++;
 822                 len -= (next_line - line);
 823                 line = next_line;
 824         }
 825         close(cp.out);
 826
 827         if (finish_command(&cp))
 828                 die("'git status --porcelain' failed in submodule %s", path);
 829
 830         strbuf_release(&buf);
 831         return dirty_submodule;
 832 }
 833
 834 int submodule_uses_gitfile(const char *path)
 835 {
 836         struct child_process cp = CHILD_PROCESS_INIT;
 837         const char *argv[] = {
 838                 "submodule",
 839                 "foreach",
 840                 "--quiet",
 841                 "--recursive",
 842                 "test -f .git",
 843                 NULL,
 844         };
 845         struct strbuf buf = STRBUF_INIT;
 846         const char *git_dir;
 847
 848         strbuf_addf(&buf, "%s/.git", path);
 849         git_dir = read_gitfile(buf.buf);
 850         if (!git_dir) {
 851                 strbuf_release(&buf);
 852                 return 0;
 853         }
 854         strbuf_release(&buf);
 855
 856         /* Now test that all nested submodules use a gitfile too */
 857         cp.argv = argv;
 858         cp.env = local_repo_env;
 859         cp.git_cmd = 1;
 860         cp.no_stdin = 1;
 861         cp.no_stderr = 1;
 862         cp.no_stdout = 1;
 863         cp.dir = path;
 864         if (run_command(&cp))
 865                 return 0;
 866
 867         return 1;
 868 }
 869
 870 int ok_to_remove_submodule(const char *path)
 871 {
 872         ssize_t len;
 873         struct child_process cp = CHILD_PROCESS_INIT;
 874         const char *argv[] = {
 875                 "status",
 876                 "--porcelain",
 877                 "-u",
 878                 "--ignore-submodules=none",
 879                 NULL,
 880         };
 881         struct strbuf buf = STRBUF_INIT;
 882         int ok_to_remove = 1;
 883
 884         if (!file_exists(path) || is_empty_dir(path))
 885                 return 1;
 886
 887         if (!submodule_uses_gitfile(path))
 888                 return 0;
 889
 890         cp.argv = argv;
 891         cp.env = local_repo_env;
 892         cp.git_cmd = 1;
 893         cp.no_stdin = 1;
 894         cp.out = -1;
 895         cp.dir = path;
 896         if (start_command(&cp))
 897                 die("Could not run 'git status --porcelain -uall --ignore-submodules=none' in submodule %s", path);
 898
 899         len = strbuf_read(&buf, cp.out, 1024);
 900         if (len > 2)
 901                 ok_to_remove = 0;
 902         close(cp.out);
 903
 904         if (finish_command(&cp))
 905                 die("'git status --porcelain -uall --ignore-submodules=none' failed in submodule %s", path);
 906
 907         strbuf_release(&buf);
 908         return ok_to_remove;
 909 }
 910
 911 static int find_first_merges(struct object_array *result, const char *path,
 912                 struct commit *a, struct commit *b)
 913 {
 914         int i, j;
 915         struct object_array merges = OBJECT_ARRAY_INIT;
 916         struct commit *commit;
 917         int contains_another;
 918
 919         char merged_revision[42];
 920         const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
 921                                    "--all", merged_revision, NULL };
 922         struct rev_info revs;
 923         struct setup_revision_opt rev_opts;
 924
 925         memset(result, 0, sizeof(struct object_array));
 926         memset(&rev_opts, 0, sizeof(rev_opts));
 927
 928         /* get all revisions that merge commit a */
 929         snprintf(merged_revision, sizeof(merged_revision), "^%s",
 930                         oid_to_hex(&a->object.oid));
 931         init_revisions(&revs, NULL);
 932         rev_opts.submodule = path;
 933         setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
 934
 935         /* save all revisions from the above list that contain b */
 936         if (prepare_revision_walk(&revs))
 937                 die("revision walk setup failed");
 938         while ((commit = get_revision(&revs)) != NULL) {
 939                 struct object *o = &(commit->object);
 940                 if (in_merge_bases(b, commit))
 941                         add_object_array(o, NULL, &merges);
 942         }
 943         reset_revision_walk();
 944
 945         /* Now we've got all merges that contain a and b. Prune all
 946          * merges that contain another found merge and save them in
 947          * result.
 948          */
 949         for (i = 0; i < merges.nr; i++) {
 950                 struct commit *m1 = (struct commit *) merges.objects[i].item;
 951
 952                 contains_another = 0;
 953                 for (j = 0; j < merges.nr; j++) {
 954                         struct commit *m2 = (struct commit *) merges.objects[j].item;
 955                         if (i != j && in_merge_bases(m2, m1)) {
 956                                 contains_another = 1;
 957                                 break;
 958                         }
 959                 }
 960
 961                 if (!contains_another)
 962                         add_object_array(merges.objects[i].item, NULL, result);
 963         }
 964
 965         free(merges.objects);
 966         return result->nr;
 967 }
 968
 969 static void print_commit(struct commit *commit)
 970 {
 971         struct strbuf sb = STRBUF_INIT;
 972         struct pretty_print_context ctx = {0};
 973         ctx.date_mode.type = DATE_NORMAL;
 974         format_commit_message(commit, " %h: %m %s", &sb, &ctx);
 975         fprintf(stderr, "%s\n", sb.buf);
 976         strbuf_release(&sb);
 977 }
 978
 979 #define MERGE_WARNING(path, msg) \
 980         warning("Failed to merge submodule %s (%s)", path, msg);
 981
 982 int merge_submodule(unsigned char result[20], const char *path,
 983                     const unsigned char base[20], const unsigned char a[20],
 984                     const unsigned char b[20], int search)
 985 {
 986         struct commit *commit_base, *commit_a, *commit_b;
 987         int parent_count;
 988         struct object_array merges;
 989
 990         int i;
 991
 992         /* store a in result in case we fail */
 993         hashcpy(result, a);
 994
 995         /* we can not handle deletion conflicts */
 996         if (is_null_sha1(base))
 997                 return 0;
 998         if (is_null_sha1(a))
 999                 return 0;
1000         if (is_null_sha1(b))
1001                 return 0;
1002
1003         if (add_submodule_odb(path)) {
1004                 MERGE_WARNING(path, "not checked out");
1005                 return 0;
1006         }
1007
1008         if (!(commit_base = lookup_commit_reference(base)) ||
1009             !(commit_a = lookup_commit_reference(a)) ||
1010             !(commit_b = lookup_commit_reference(b))) {
1011                 MERGE_WARNING(path, "commits not present");
1012                 return 0;
1013         }
1014
1015         /* check whether both changes are forward */
1016         if (!in_merge_bases(commit_base, commit_a) ||
1017             !in_merge_bases(commit_base, commit_b)) {
1018                 MERGE_WARNING(path, "commits don't follow merge-base");
1019                 return 0;
1020         }
1021
1022         /* Case #1: a is contained in b or vice versa */
1023         if (in_merge_bases(commit_a, commit_b)) {
1024                 hashcpy(result, b);
1025                 return 1;
1026         }
1027         if (in_merge_bases(commit_b, commit_a)) {
1028                 hashcpy(result, a);
1029                 return 1;
1030         }
1031
1032         /*
1033          * Case #2: There are one or more merges that contain a and b in
1034          * the submodule. If there is only one, then present it as a
1035          * suggestion to the user, but leave it marked unmerged so the
1036          * user needs to confirm the resolution.
1037          */
1038
1039         /* Skip the search if makes no sense to the calling context.  */
1040         if (!search)
1041                 return 0;
1042
1043         /* find commit which merges them */
1044         parent_count = find_first_merges(&merges, path, commit_a, commit_b);
1045         switch (parent_count) {
1046         case 0:
1047                 MERGE_WARNING(path, "merge following commits not found");
1048                 break;
1049
1050         case 1:
1051                 MERGE_WARNING(path, "not fast-forward");
1052                 fprintf(stderr, "Found a possible merge resolution "
1053                                 "for the submodule:\n");
1054                 print_commit((struct commit *) merges.objects[0].item);
1055                 fprintf(stderr,
1056                         "If this is correct simply add it to the index "
1057                         "for example\n"
1058                         "by using:\n\n"
1059                         "  git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1060                         "which will accept this suggestion.\n",
1061                         oid_to_hex(&merges.objects[0].item->oid), path);
1062                 break;
1063
1064         default:
1065                 MERGE_WARNING(path, "multiple merges found");
1066                 for (i = 0; i < merges.nr; i++)
1067                         print_commit((struct commit *) merges.objects[i].item);
1068         }
1069
1070         free(merges.objects);
1071         return 0;
1072 }
1073
1074 /* Update gitfile and core.worktree setting to connect work tree and git dir */
1075 void connect_work_tree_and_git_dir(const char *work_tree, const char *git_dir)
1076 {
1077         struct strbuf file_name = STRBUF_INIT;
1078         struct strbuf rel_path = STRBUF_INIT;
1079         const char *real_work_tree = xstrdup(real_path(work_tree));
1080
1081         /* Update gitfile */
1082         strbuf_addf(&file_name, "%s/.git", work_tree);
1083         write_file(file_name.buf, "gitdir: %s",
1084                    relative_path(git_dir, real_work_tree, &rel_path));
1085
1086         /* Update core.worktree setting */
1087         strbuf_reset(&file_name);
1088         strbuf_addf(&file_name, "%s/config", git_dir);
1089         git_config_set_in_file(file_name.buf, "core.worktree",
1090                                relative_path(real_work_tree, git_dir,
1091                                              &rel_path));
1092
1093         strbuf_release(&file_name);
1094         strbuf_release(&rel_path);
1095         free((void *)real_work_tree);
1096 }