git.oblomov.eu Git - git/blob - 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 #include "quote.h"
  17
  18 static int config_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND;
  19 static int parallel_jobs = 1;
  20 static struct string_list changed_submodule_paths = STRING_LIST_INIT_NODUP;
  21 static int initialized_fetch_ref_tips;
  22 static struct sha1_array ref_tips_before_fetch;
  23 static struct sha1_array ref_tips_after_fetch;
  24
  25 /*
  26  * The following flag is set if the .gitmodules file is unmerged. We then
  27  * disable recursion for all submodules where .git/config doesn't have a
  28  * matching config entry because we can't guess what might be configured in
  29  * .gitmodules unless the user resolves the conflict. When a command line
  30  * option is given (which always overrides configuration) this flag will be
  31  * ignored.
  32  */
  33 static int gitmodules_is_unmerged;
  34
  35 /*
  36  * This flag is set if the .gitmodules file had unstaged modifications on
  37  * startup. This must be checked before allowing modifications to the
  38  * .gitmodules file with the intention to stage them later, because when
  39  * continuing we would stage the modifications the user didn't stage herself
  40  * too. That might change in a future version when we learn to stage the
  41  * changes we do ourselves without staging any previous modifications.
  42  */
  43 static int gitmodules_is_modified;
  44
  45 int is_staging_gitmodules_ok(void)
  46 {
  47         return !gitmodules_is_modified;
  48 }
  49
  50 /*
  51  * Try to update the "path" entry in the "submodule.<name>" section of the
  52  * .gitmodules file. Return 0 only if a .gitmodules file was found, a section
  53  * with the correct path=<oldpath> setting was found and we could update it.
  54  */
  55 int update_path_in_gitmodules(const char *oldpath, const char *newpath)
  56 {
  57         struct strbuf entry = STRBUF_INIT;
  58         const struct submodule *submodule;
  59
  60         if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
  61                 return -1;
  62
  63         if (gitmodules_is_unmerged)
  64                 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
  65
  66         submodule = submodule_from_path(null_sha1, oldpath);
  67         if (!submodule || !submodule->name) {
  68                 warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
  69                 return -1;
  70         }
  71         strbuf_addstr(&entry, "submodule.");
  72         strbuf_addstr(&entry, submodule->name);
  73         strbuf_addstr(&entry, ".path");
  74         if (git_config_set_in_file_gently(".gitmodules", entry.buf, newpath) < 0) {
  75                 /* Maybe the user already did that, don't error out here */
  76                 warning(_("Could not update .gitmodules entry %s"), entry.buf);
  77                 strbuf_release(&entry);
  78                 return -1;
  79         }
  80         strbuf_release(&entry);
  81         return 0;
  82 }
  83
  84 /*
  85  * Try to remove the "submodule.<name>" section from .gitmodules where the given
  86  * path is configured. Return 0 only if a .gitmodules file was found, a section
  87  * with the correct path=<path> setting was found and we could remove it.
  88  */
  89 int remove_path_from_gitmodules(const char *path)
  90 {
  91         struct strbuf sect = STRBUF_INIT;
  92         const struct submodule *submodule;
  93
  94         if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
  95                 return -1;
  96
  97         if (gitmodules_is_unmerged)
  98                 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
  99
 100         submodule = submodule_from_path(null_sha1, path);
 101         if (!submodule || !submodule->name) {
 102                 warning(_("Could not find section in .gitmodules where path=%s"), path);
 103                 return -1;
 104         }
 105         strbuf_addstr(&sect, "submodule.");
 106         strbuf_addstr(&sect, submodule->name);
 107         if (git_config_rename_section_in_file(".gitmodules", sect.buf, NULL) < 0) {
 108                 /* Maybe the user already did that, don't error out here */
 109                 warning(_("Could not remove .gitmodules entry for %s"), path);
 110                 strbuf_release(&sect);
 111                 return -1;
 112         }
 113         strbuf_release(&sect);
 114         return 0;
 115 }
 116
 117 void stage_updated_gitmodules(void)
 118 {
 119         if (add_file_to_cache(".gitmodules", 0))
 120                 die(_("staging updated .gitmodules failed"));
 121 }
 122
 123 static int add_submodule_odb(const char *path)
 124 {
 125         struct strbuf objects_directory = STRBUF_INIT;
 126         struct alternate_object_database *alt_odb;
 127         int ret = 0;
 128         size_t alloc;
 129
 130         strbuf_git_path_submodule(&objects_directory, path, "objects/");
 131         if (!is_directory(objects_directory.buf)) {
 132                 ret = -1;
 133                 goto done;
 134         }
 135         /* avoid adding it twice */
 136         prepare_alt_odb();
 137         for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
 138                 if (alt_odb->name - alt_odb->base == objects_directory.len &&
 139                                 !strncmp(alt_odb->base, objects_directory.buf,
 140                                         objects_directory.len))
 141                         goto done;
 142
 143         alloc = st_add(objects_directory.len, 42); /* for "12/345..." sha1 */
 144         alt_odb = xmalloc(st_add(sizeof(*alt_odb), alloc));
 145         alt_odb->next = alt_odb_list;
 146         xsnprintf(alt_odb->base, alloc, "%s", objects_directory.buf);
 147         alt_odb->name = alt_odb->base + objects_directory.len;
 148         alt_odb->name[2] = '/';
 149         alt_odb->name[40] = '\0';
 150         alt_odb->name[41] = '\0';
 151         alt_odb_list = alt_odb;
 152
 153         /* add possible alternates from the submodule */
 154         read_info_alternates(objects_directory.buf, 0);
 155 done:
 156         strbuf_release(&objects_directory);
 157         return ret;
 158 }
 159
 160 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
 161                                              const char *path)
 162 {
 163         const struct submodule *submodule = submodule_from_path(null_sha1, path);
 164         if (submodule) {
 165                 if (submodule->ignore)
 166                         handle_ignore_submodules_arg(diffopt, submodule->ignore);
 167                 else if (gitmodules_is_unmerged)
 168                         DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 169         }
 170 }
 171
 172 int submodule_config(const char *var, const char *value, void *cb)
 173 {
 174         if (!strcmp(var, "submodule.fetchjobs")) {
 175                 parallel_jobs = git_config_int(var, value);
 176                 if (parallel_jobs < 0)
 177                         die(_("negative values not allowed for submodule.fetchJobs"));
 178                 return 0;
 179         } else if (starts_with(var, "submodule."))
 180                 return parse_submodule_config_option(var, value);
 181         else if (!strcmp(var, "fetch.recursesubmodules")) {
 182                 config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
 183                 return 0;
 184         }
 185         return 0;
 186 }
 187
 188 void gitmodules_config(void)
 189 {
 190         const char *work_tree = get_git_work_tree();
 191         if (work_tree) {
 192                 struct strbuf gitmodules_path = STRBUF_INIT;
 193                 int pos;
 194                 strbuf_addstr(&gitmodules_path, work_tree);
 195                 strbuf_addstr(&gitmodules_path, "/.gitmodules");
 196                 if (read_cache() < 0)
 197                         die("index file corrupt");
 198                 pos = cache_name_pos(".gitmodules", 11);
 199                 if (pos < 0) { /* .gitmodules not found or isn't merged */
 200                         pos = -1 - pos;
 201                         if (active_nr > pos) {  /* there is a .gitmodules */
 202                                 const struct cache_entry *ce = active_cache[pos];
 203                                 if (ce_namelen(ce) == 11 &&
 204                                     !memcmp(ce->name, ".gitmodules", 11))
 205                                         gitmodules_is_unmerged = 1;
 206                         }
 207                 } else if (pos < active_nr) {
 208                         struct stat st;
 209                         if (lstat(".gitmodules", &st) == 0 &&
 210                             ce_match_stat(active_cache[pos], &st, 0) & DATA_CHANGED)
 211                                 gitmodules_is_modified = 1;
 212                 }
 213
 214                 if (!gitmodules_is_unmerged)
 215                         git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
 216                 strbuf_release(&gitmodules_path);
 217         }
 218 }
 219
 220 int parse_submodule_update_strategy(const char *value,
 221                 struct submodule_update_strategy *dst)
 222 {
 223         free((void*)dst->command);
 224         dst->command = NULL;
 225         if (!strcmp(value, "none"))
 226                 dst->type = SM_UPDATE_NONE;
 227         else if (!strcmp(value, "checkout"))
 228                 dst->type = SM_UPDATE_CHECKOUT;
 229         else if (!strcmp(value, "rebase"))
 230                 dst->type = SM_UPDATE_REBASE;
 231         else if (!strcmp(value, "merge"))
 232                 dst->type = SM_UPDATE_MERGE;
 233         else if (skip_prefix(value, "!", &value)) {
 234                 dst->type = SM_UPDATE_COMMAND;
 235                 dst->command = xstrdup(value);
 236         } else
 237                 return -1;
 238         return 0;
 239 }
 240
 241 const char *submodule_strategy_to_string(const struct submodule_update_strategy *s)
 242 {
 243         struct strbuf sb = STRBUF_INIT;
 244         switch (s->type) {
 245         case SM_UPDATE_CHECKOUT:
 246                 return "checkout";
 247         case SM_UPDATE_MERGE:
 248                 return "merge";
 249         case SM_UPDATE_REBASE:
 250                 return "rebase";
 251         case SM_UPDATE_NONE:
 252                 return "none";
 253         case SM_UPDATE_UNSPECIFIED:
 254                 return NULL;
 255         case SM_UPDATE_COMMAND:
 256                 strbuf_addf(&sb, "!%s", s->command);
 257                 return strbuf_detach(&sb, NULL);
 258         }
 259         return NULL;
 260 }
 261
 262 void handle_ignore_submodules_arg(struct diff_options *diffopt,
 263                                   const char *arg)
 264 {
 265         DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
 266         DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 267         DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
 268
 269         if (!strcmp(arg, "all"))
 270                 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 271         else if (!strcmp(arg, "untracked"))
 272                 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 273         else if (!strcmp(arg, "dirty"))
 274                 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
 275         else if (strcmp(arg, "none"))
 276                 die("bad --ignore-submodules argument: %s", arg);
 277 }
 278
 279 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
 280                 struct commit *left, struct commit *right,
 281                 int *fast_forward, int *fast_backward)
 282 {
 283         struct commit_list *merge_bases, *list;
 284
 285         init_revisions(rev, NULL);
 286         setup_revisions(0, NULL, rev, NULL);
 287         rev->left_right = 1;
 288         rev->first_parent_only = 1;
 289         left->object.flags |= SYMMETRIC_LEFT;
 290         add_pending_object(rev, &left->object, path);
 291         add_pending_object(rev, &right->object, path);
 292         merge_bases = get_merge_bases(left, right);
 293         if (merge_bases) {
 294                 if (merge_bases->item == left)
 295                         *fast_forward = 1;
 296                 else if (merge_bases->item == right)
 297                         *fast_backward = 1;
 298         }
 299         for (list = merge_bases; list; list = list->next) {
 300                 list->item->object.flags |= UNINTERESTING;
 301                 add_pending_object(rev, &list->item->object,
 302                         oid_to_hex(&list->item->object.oid));
 303         }
 304         return prepare_revision_walk(rev);
 305 }
 306
 307 static void print_submodule_summary(struct rev_info *rev, FILE *f,
 308                 const char *line_prefix,
 309                 const char *del, const char *add, const char *reset)
 310 {
 311         static const char format[] = "  %m %s";
 312         struct strbuf sb = STRBUF_INIT;
 313         struct commit *commit;
 314
 315         while ((commit = get_revision(rev))) {
 316                 struct pretty_print_context ctx = {0};
 317                 ctx.date_mode = rev->date_mode;
 318                 ctx.output_encoding = get_log_output_encoding();
 319                 strbuf_setlen(&sb, 0);
 320                 strbuf_addstr(&sb, line_prefix);
 321                 if (commit->object.flags & SYMMETRIC_LEFT) {
 322                         if (del)
 323                                 strbuf_addstr(&sb, del);
 324                 }
 325                 else if (add)
 326                         strbuf_addstr(&sb, add);
 327                 format_commit_message(commit, format, &sb, &ctx);
 328                 if (reset)
 329                         strbuf_addstr(&sb, reset);
 330                 strbuf_addch(&sb, '\n');
 331                 fprintf(f, "%s", sb.buf);
 332         }
 333         strbuf_release(&sb);
 334 }
 335
 336 void show_submodule_summary(FILE *f, const char *path,
 337                 const char *line_prefix,
 338                 unsigned char one[20], unsigned char two[20],
 339                 unsigned dirty_submodule, const char *meta,
 340                 const char *del, const char *add, const char *reset)
 341 {
 342         struct rev_info rev;
 343         struct commit *left = NULL, *right = NULL;
 344         const char *message = NULL;
 345         struct strbuf sb = STRBUF_INIT;
 346         int fast_forward = 0, fast_backward = 0;
 347
 348         if (is_null_sha1(two))
 349                 message = "(submodule deleted)";
 350         else if (add_submodule_odb(path))
 351                 message = "(not checked out)";
 352         else if (is_null_sha1(one))
 353                 message = "(new submodule)";
 354         else if (!(left = lookup_commit_reference(one)) ||
 355                  !(right = lookup_commit_reference(two)))
 356                 message = "(commits not present)";
 357         else if (prepare_submodule_summary(&rev, path, left, right,
 358                                            &fast_forward, &fast_backward))
 359                 message = "(revision walker failed)";
 360
 361         if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
 362                 fprintf(f, "%sSubmodule %s contains untracked content\n",
 363                         line_prefix, path);
 364         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 365                 fprintf(f, "%sSubmodule %s contains modified content\n",
 366                         line_prefix, path);
 367
 368         if (!hashcmp(one, two)) {
 369                 strbuf_release(&sb);
 370                 return;
 371         }
 372
 373         strbuf_addf(&sb, "%s%sSubmodule %s %s..", line_prefix, meta, path,
 374                         find_unique_abbrev(one, DEFAULT_ABBREV));
 375         if (!fast_backward && !fast_forward)
 376                 strbuf_addch(&sb, '.');
 377         strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
 378         if (message)
 379                 strbuf_addf(&sb, " %s%s\n", message, reset);
 380         else
 381                 strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
 382         fwrite(sb.buf, sb.len, 1, f);
 383
 384         if (!message) /* only NULL if we succeeded in setting up the walk */
 385                 print_submodule_summary(&rev, f, line_prefix, del, add, reset);
 386         if (left)
 387                 clear_commit_marks(left, ~0);
 388         if (right)
 389                 clear_commit_marks(right, ~0);
 390
 391         strbuf_release(&sb);
 392 }
 393
 394 void set_config_fetch_recurse_submodules(int value)
 395 {
 396         config_fetch_recurse_submodules = value;
 397 }
 398
 399 static int has_remote(const char *refname, const struct object_id *oid,
 400                       int flags, void *cb_data)
 401 {
 402         return 1;
 403 }
 404
 405 static int submodule_needs_pushing(const char *path, const unsigned char sha1[20])
 406 {
 407         if (add_submodule_odb(path) || !lookup_commit_reference(sha1))
 408                 return 0;
 409
 410         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 411                 struct child_process cp = CHILD_PROCESS_INIT;
 412                 const char *argv[] = {"rev-list", NULL, "--not", "--remotes", "-n", "1" , NULL};
 413                 struct strbuf buf = STRBUF_INIT;
 414                 int needs_pushing = 0;
 415
 416                 argv[1] = sha1_to_hex(sha1);
 417                 cp.argv = argv;
 418                 prepare_submodule_repo_env(&cp.env_array);
 419                 cp.git_cmd = 1;
 420                 cp.no_stdin = 1;
 421                 cp.out = -1;
 422                 cp.dir = path;
 423                 if (start_command(&cp))
 424                         die("Could not run 'git rev-list %s --not --remotes -n 1' command in submodule %s",
 425                                 sha1_to_hex(sha1), path);
 426                 if (strbuf_read(&buf, cp.out, 41))
 427                         needs_pushing = 1;
 428                 finish_command(&cp);
 429                 close(cp.out);
 430                 strbuf_release(&buf);
 431                 return needs_pushing;
 432         }
 433
 434         return 0;
 435 }
 436
 437 static void collect_submodules_from_diff(struct diff_queue_struct *q,
 438                                          struct diff_options *options,
 439                                          void *data)
 440 {
 441         int i;
 442         struct string_list *needs_pushing = data;
 443
 444         for (i = 0; i < q->nr; i++) {
 445                 struct diff_filepair *p = q->queue[i];
 446                 if (!S_ISGITLINK(p->two->mode))
 447                         continue;
 448                 if (submodule_needs_pushing(p->two->path, p->two->oid.hash))
 449                         string_list_insert(needs_pushing, p->two->path);
 450         }
 451 }
 452
 453 static void find_unpushed_submodule_commits(struct commit *commit,
 454                 struct string_list *needs_pushing)
 455 {
 456         struct rev_info rev;
 457
 458         init_revisions(&rev, NULL);
 459         rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
 460         rev.diffopt.format_callback = collect_submodules_from_diff;
 461         rev.diffopt.format_callback_data = needs_pushing;
 462         diff_tree_combined_merge(commit, 1, &rev);
 463 }
 464
 465 int find_unpushed_submodules(unsigned char new_sha1[20],
 466                 const char *remotes_name, struct string_list *needs_pushing)
 467 {
 468         struct rev_info rev;
 469         struct commit *commit;
 470         const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
 471         int argc = ARRAY_SIZE(argv) - 1;
 472         char *sha1_copy;
 473
 474         struct strbuf remotes_arg = STRBUF_INIT;
 475
 476         strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
 477         init_revisions(&rev, NULL);
 478         sha1_copy = xstrdup(sha1_to_hex(new_sha1));
 479         argv[1] = sha1_copy;
 480         argv[3] = remotes_arg.buf;
 481         setup_revisions(argc, argv, &rev, NULL);
 482         if (prepare_revision_walk(&rev))
 483                 die("revision walk setup failed");
 484
 485         while ((commit = get_revision(&rev)) != NULL)
 486                 find_unpushed_submodule_commits(commit, needs_pushing);
 487
 488         reset_revision_walk();
 489         free(sha1_copy);
 490         strbuf_release(&remotes_arg);
 491
 492         return needs_pushing->nr;
 493 }
 494
 495 static int push_submodule(const char *path)
 496 {
 497         if (add_submodule_odb(path))
 498                 return 1;
 499
 500         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 501                 struct child_process cp = CHILD_PROCESS_INIT;
 502                 const char *argv[] = {"push", NULL};
 503
 504                 cp.argv = argv;
 505                 prepare_submodule_repo_env(&cp.env_array);
 506                 cp.git_cmd = 1;
 507                 cp.no_stdin = 1;
 508                 cp.dir = path;
 509                 if (run_command(&cp))
 510                         return 0;
 511                 close(cp.out);
 512         }
 513
 514         return 1;
 515 }
 516
 517 int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name)
 518 {
 519         int i, ret = 1;
 520         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 521
 522         if (!find_unpushed_submodules(new_sha1, remotes_name, &needs_pushing))
 523                 return 1;
 524
 525         for (i = 0; i < needs_pushing.nr; i++) {
 526                 const char *path = needs_pushing.items[i].string;
 527                 fprintf(stderr, "Pushing submodule '%s'\n", path);
 528                 if (!push_submodule(path)) {
 529                         fprintf(stderr, "Unable to push submodule '%s'\n", path);
 530                         ret = 0;
 531                 }
 532         }
 533
 534         string_list_clear(&needs_pushing, 0);
 535
 536         return ret;
 537 }
 538
 539 static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
 540 {
 541         int is_present = 0;
 542         if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
 543                 /* Even if the submodule is checked out and the commit is
 544                  * present, make sure it is reachable from a ref. */
 545                 struct child_process cp = CHILD_PROCESS_INIT;
 546                 const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
 547                 struct strbuf buf = STRBUF_INIT;
 548
 549                 argv[3] = sha1_to_hex(sha1);
 550                 cp.argv = argv;
 551                 prepare_submodule_repo_env(&cp.env_array);
 552                 cp.git_cmd = 1;
 553                 cp.no_stdin = 1;
 554                 cp.dir = path;
 555                 if (!capture_command(&cp, &buf, 1024) && !buf.len)
 556                         is_present = 1;
 557
 558                 strbuf_release(&buf);
 559         }
 560         return is_present;
 561 }
 562
 563 static void submodule_collect_changed_cb(struct diff_queue_struct *q,
 564                                          struct diff_options *options,
 565                                          void *data)
 566 {
 567         int i;
 568         for (i = 0; i < q->nr; i++) {
 569                 struct diff_filepair *p = q->queue[i];
 570                 if (!S_ISGITLINK(p->two->mode))
 571                         continue;
 572
 573                 if (S_ISGITLINK(p->one->mode)) {
 574                         /* NEEDSWORK: We should honor the name configured in
 575                          * the .gitmodules file of the commit we are examining
 576                          * here to be able to correctly follow submodules
 577                          * being moved around. */
 578                         struct string_list_item *path;
 579                         path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
 580                         if (!path && !is_submodule_commit_present(p->two->path, p->two->oid.hash))
 581                                 string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
 582                 } else {
 583                         /* Submodule is new or was moved here */
 584                         /* NEEDSWORK: When the .git directories of submodules
 585                          * live inside the superprojects .git directory some
 586                          * day we should fetch new submodules directly into
 587                          * that location too when config or options request
 588                          * that so they can be checked out from there. */
 589                         continue;
 590                 }
 591         }
 592 }
 593
 594 static int add_sha1_to_array(const char *ref, const struct object_id *oid,
 595                              int flags, void *data)
 596 {
 597         sha1_array_append(data, oid->hash);
 598         return 0;
 599 }
 600
 601 void check_for_new_submodule_commits(unsigned char new_sha1[20])
 602 {
 603         if (!initialized_fetch_ref_tips) {
 604                 for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
 605                 initialized_fetch_ref_tips = 1;
 606         }
 607
 608         sha1_array_append(&ref_tips_after_fetch, new_sha1);
 609 }
 610
 611 static void add_sha1_to_argv(const unsigned char sha1[20], void *data)
 612 {
 613         argv_array_push(data, sha1_to_hex(sha1));
 614 }
 615
 616 static void calculate_changed_submodule_paths(void)
 617 {
 618         struct rev_info rev;
 619         struct commit *commit;
 620         struct argv_array argv = ARGV_ARRAY_INIT;
 621
 622         /* No need to check if there are no submodules configured */
 623         if (!submodule_from_path(NULL, NULL))
 624                 return;
 625
 626         init_revisions(&rev, NULL);
 627         argv_array_push(&argv, "--"); /* argv[0] program name */
 628         sha1_array_for_each_unique(&ref_tips_after_fetch,
 629                                    add_sha1_to_argv, &argv);
 630         argv_array_push(&argv, "--not");
 631         sha1_array_for_each_unique(&ref_tips_before_fetch,
 632                                    add_sha1_to_argv, &argv);
 633         setup_revisions(argv.argc, argv.argv, &rev, NULL);
 634         if (prepare_revision_walk(&rev))
 635                 die("revision walk setup failed");
 636
 637         /*
 638          * Collect all submodules (whether checked out or not) for which new
 639          * commits have been recorded upstream in "changed_submodule_paths".
 640          */
 641         while ((commit = get_revision(&rev))) {
 642                 struct commit_list *parent = commit->parents;
 643                 while (parent) {
 644                         struct diff_options diff_opts;
 645                         diff_setup(&diff_opts);
 646                         DIFF_OPT_SET(&diff_opts, RECURSIVE);
 647                         diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
 648                         diff_opts.format_callback = submodule_collect_changed_cb;
 649                         diff_setup_done(&diff_opts);
 650                         diff_tree_sha1(parent->item->object.oid.hash, commit->object.oid.hash, "", &diff_opts);
 651                         diffcore_std(&diff_opts);
 652                         diff_flush(&diff_opts);
 653                         parent = parent->next;
 654                 }
 655         }
 656
 657         argv_array_clear(&argv);
 658         sha1_array_clear(&ref_tips_before_fetch);
 659         sha1_array_clear(&ref_tips_after_fetch);
 660         initialized_fetch_ref_tips = 0;
 661 }
 662
 663 struct submodule_parallel_fetch {
 664         int count;
 665         struct argv_array args;
 666         const char *work_tree;
 667         const char *prefix;
 668         int command_line_option;
 669         int quiet;
 670         int result;
 671 };
 672 #define SPF_INIT {0, ARGV_ARRAY_INIT, NULL, NULL, 0, 0, 0}
 673
 674 static int get_next_submodule(struct child_process *cp,
 675                               struct strbuf *err, void *data, void **task_cb)
 676 {
 677         int ret = 0;
 678         struct submodule_parallel_fetch *spf = data;
 679
 680         for (; spf->count < active_nr; spf->count++) {
 681                 struct strbuf submodule_path = STRBUF_INIT;
 682                 struct strbuf submodule_git_dir = STRBUF_INIT;
 683                 struct strbuf submodule_prefix = STRBUF_INIT;
 684                 const struct cache_entry *ce = active_cache[spf->count];
 685                 const char *git_dir, *default_argv;
 686                 const struct submodule *submodule;
 687
 688                 if (!S_ISGITLINK(ce->ce_mode))
 689                         continue;
 690
 691                 submodule = submodule_from_path(null_sha1, ce->name);
 692                 if (!submodule)
 693                         submodule = submodule_from_name(null_sha1, ce->name);
 694
 695                 default_argv = "yes";
 696                 if (spf->command_line_option == RECURSE_SUBMODULES_DEFAULT) {
 697                         if (submodule &&
 698                             submodule->fetch_recurse !=
 699                                                 RECURSE_SUBMODULES_NONE) {
 700                                 if (submodule->fetch_recurse ==
 701                                                 RECURSE_SUBMODULES_OFF)
 702                                         continue;
 703                                 if (submodule->fetch_recurse ==
 704                                                 RECURSE_SUBMODULES_ON_DEMAND) {
 705                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 706                                                 continue;
 707                                         default_argv = "on-demand";
 708                                 }
 709                         } else {
 710                                 if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
 711                                     gitmodules_is_unmerged)
 712                                         continue;
 713                                 if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
 714                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 715                                                 continue;
 716                                         default_argv = "on-demand";
 717                                 }
 718                         }
 719                 } else if (spf->command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
 720                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 721                                 continue;
 722                         default_argv = "on-demand";
 723                 }
 724
 725                 strbuf_addf(&submodule_path, "%s/%s", spf->work_tree, ce->name);
 726                 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
 727                 strbuf_addf(&submodule_prefix, "%s%s/", spf->prefix, ce->name);
 728                 git_dir = read_gitfile(submodule_git_dir.buf);
 729                 if (!git_dir)
 730                         git_dir = submodule_git_dir.buf;
 731                 if (is_directory(git_dir)) {
 732                         child_process_init(cp);
 733                         cp->dir = strbuf_detach(&submodule_path, NULL);
 734                         prepare_submodule_repo_env(&cp->env_array);
 735                         cp->git_cmd = 1;
 736                         if (!spf->quiet)
 737                                 strbuf_addf(err, "Fetching submodule %s%s\n",
 738                                             spf->prefix, ce->name);
 739                         argv_array_init(&cp->args);
 740                         argv_array_pushv(&cp->args, spf->args.argv);
 741                         argv_array_push(&cp->args, default_argv);
 742                         argv_array_push(&cp->args, "--submodule-prefix");
 743                         argv_array_push(&cp->args, submodule_prefix.buf);
 744                         ret = 1;
 745                 }
 746                 strbuf_release(&submodule_path);
 747                 strbuf_release(&submodule_git_dir);
 748                 strbuf_release(&submodule_prefix);
 749                 if (ret) {
 750                         spf->count++;
 751                         return 1;
 752                 }
 753         }
 754         return 0;
 755 }
 756
 757 static int fetch_start_failure(struct strbuf *err,
 758                                void *cb, void *task_cb)
 759 {
 760         struct submodule_parallel_fetch *spf = cb;
 761
 762         spf->result = 1;
 763
 764         return 0;
 765 }
 766
 767 static int fetch_finish(int retvalue, struct strbuf *err,
 768                         void *cb, void *task_cb)
 769 {
 770         struct submodule_parallel_fetch *spf = cb;
 771
 772         if (retvalue)
 773                 spf->result = 1;
 774
 775         return 0;
 776 }
 777
 778 int fetch_populated_submodules(const struct argv_array *options,
 779                                const char *prefix, int command_line_option,
 780                                int quiet, int max_parallel_jobs)
 781 {
 782         int i;
 783         struct submodule_parallel_fetch spf = SPF_INIT;
 784
 785         spf.work_tree = get_git_work_tree();
 786         spf.command_line_option = command_line_option;
 787         spf.quiet = quiet;
 788         spf.prefix = prefix;
 789
 790         if (!spf.work_tree)
 791                 goto out;
 792
 793         if (read_cache() < 0)
 794                 die("index file corrupt");
 795
 796         argv_array_push(&spf.args, "fetch");
 797         for (i = 0; i < options->argc; i++)
 798                 argv_array_push(&spf.args, options->argv[i]);
 799         argv_array_push(&spf.args, "--recurse-submodules-default");
 800         /* default value, "--submodule-prefix" and its value are added later */
 801
 802         if (max_parallel_jobs < 0)
 803                 max_parallel_jobs = parallel_jobs;
 804
 805         calculate_changed_submodule_paths();
 806         run_processes_parallel(max_parallel_jobs,
 807                                get_next_submodule,
 808                                fetch_start_failure,
 809                                fetch_finish,
 810                                &spf);
 811
 812         argv_array_clear(&spf.args);
 813 out:
 814         string_list_clear(&changed_submodule_paths, 1);
 815         return spf.result;
 816 }
 817
 818 unsigned is_submodule_modified(const char *path, int ignore_untracked)
 819 {
 820         ssize_t len;
 821         struct child_process cp = CHILD_PROCESS_INIT;
 822         const char *argv[] = {
 823                 "status",
 824                 "--porcelain",
 825                 NULL,
 826                 NULL,
 827         };
 828         struct strbuf buf = STRBUF_INIT;
 829         unsigned dirty_submodule = 0;
 830         const char *line, *next_line;
 831         const char *git_dir;
 832
 833         strbuf_addf(&buf, "%s/.git", path);
 834         git_dir = read_gitfile(buf.buf);
 835         if (!git_dir)
 836                 git_dir = buf.buf;
 837         if (!is_directory(git_dir)) {
 838                 strbuf_release(&buf);
 839                 /* The submodule is not checked out, so it is not modified */
 840                 return 0;
 841
 842         }
 843         strbuf_reset(&buf);
 844
 845         if (ignore_untracked)
 846                 argv[2] = "-uno";
 847
 848         cp.argv = argv;
 849         prepare_submodule_repo_env(&cp.env_array);
 850         cp.git_cmd = 1;
 851         cp.no_stdin = 1;
 852         cp.out = -1;
 853         cp.dir = path;
 854         if (start_command(&cp))
 855                 die("Could not run 'git status --porcelain' in submodule %s", path);
 856
 857         len = strbuf_read(&buf, cp.out, 1024);
 858         line = buf.buf;
 859         while (len > 2) {
 860                 if ((line[0] == '?') && (line[1] == '?')) {
 861                         dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
 862                         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 863                                 break;
 864                 } else {
 865                         dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
 866                         if (ignore_untracked ||
 867                             (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
 868                                 break;
 869                 }
 870                 next_line = strchr(line, '\n');
 871                 if (!next_line)
 872                         break;
 873                 next_line++;
 874                 len -= (next_line - line);
 875                 line = next_line;
 876         }
 877         close(cp.out);
 878
 879         if (finish_command(&cp))
 880                 die("'git status --porcelain' failed in submodule %s", path);
 881
 882         strbuf_release(&buf);
 883         return dirty_submodule;
 884 }
 885
 886 int submodule_uses_gitfile(const char *path)
 887 {
 888         struct child_process cp = CHILD_PROCESS_INIT;
 889         const char *argv[] = {
 890                 "submodule",
 891                 "foreach",
 892                 "--quiet",
 893                 "--recursive",
 894                 "test -f .git",
 895                 NULL,
 896         };
 897         struct strbuf buf = STRBUF_INIT;
 898         const char *git_dir;
 899
 900         strbuf_addf(&buf, "%s/.git", path);
 901         git_dir = read_gitfile(buf.buf);
 902         if (!git_dir) {
 903                 strbuf_release(&buf);
 904                 return 0;
 905         }
 906         strbuf_release(&buf);
 907
 908         /* Now test that all nested submodules use a gitfile too */
 909         cp.argv = argv;
 910         prepare_submodule_repo_env(&cp.env_array);
 911         cp.git_cmd = 1;
 912         cp.no_stdin = 1;
 913         cp.no_stderr = 1;
 914         cp.no_stdout = 1;
 915         cp.dir = path;
 916         if (run_command(&cp))
 917                 return 0;
 918
 919         return 1;
 920 }
 921
 922 int ok_to_remove_submodule(const char *path)
 923 {
 924         ssize_t len;
 925         struct child_process cp = CHILD_PROCESS_INIT;
 926         const char *argv[] = {
 927                 "status",
 928                 "--porcelain",
 929                 "-u",
 930                 "--ignore-submodules=none",
 931                 NULL,
 932         };
 933         struct strbuf buf = STRBUF_INIT;
 934         int ok_to_remove = 1;
 935
 936         if (!file_exists(path) || is_empty_dir(path))
 937                 return 1;
 938
 939         if (!submodule_uses_gitfile(path))
 940                 return 0;
 941
 942         cp.argv = argv;
 943         prepare_submodule_repo_env(&cp.env_array);
 944         cp.git_cmd = 1;
 945         cp.no_stdin = 1;
 946         cp.out = -1;
 947         cp.dir = path;
 948         if (start_command(&cp))
 949                 die("Could not run 'git status --porcelain -uall --ignore-submodules=none' in submodule %s", path);
 950
 951         len = strbuf_read(&buf, cp.out, 1024);
 952         if (len > 2)
 953                 ok_to_remove = 0;
 954         close(cp.out);
 955
 956         if (finish_command(&cp))
 957                 die("'git status --porcelain -uall --ignore-submodules=none' failed in submodule %s", path);
 958
 959         strbuf_release(&buf);
 960         return ok_to_remove;
 961 }
 962
 963 static int find_first_merges(struct object_array *result, const char *path,
 964                 struct commit *a, struct commit *b)
 965 {
 966         int i, j;
 967         struct object_array merges = OBJECT_ARRAY_INIT;
 968         struct commit *commit;
 969         int contains_another;
 970
 971         char merged_revision[42];
 972         const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
 973                                    "--all", merged_revision, NULL };
 974         struct rev_info revs;
 975         struct setup_revision_opt rev_opts;
 976
 977         memset(result, 0, sizeof(struct object_array));
 978         memset(&rev_opts, 0, sizeof(rev_opts));
 979
 980         /* get all revisions that merge commit a */
 981         snprintf(merged_revision, sizeof(merged_revision), "^%s",
 982                         oid_to_hex(&a->object.oid));
 983         init_revisions(&revs, NULL);
 984         rev_opts.submodule = path;
 985         setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
 986
 987         /* save all revisions from the above list that contain b */
 988         if (prepare_revision_walk(&revs))
 989                 die("revision walk setup failed");
 990         while ((commit = get_revision(&revs)) != NULL) {
 991                 struct object *o = &(commit->object);
 992                 if (in_merge_bases(b, commit))
 993                         add_object_array(o, NULL, &merges);
 994         }
 995         reset_revision_walk();
 996
 997         /* Now we've got all merges that contain a and b. Prune all
 998          * merges that contain another found merge and save them in
 999          * result.
1000          */
1001         for (i = 0; i < merges.nr; i++) {
1002                 struct commit *m1 = (struct commit *) merges.objects[i].item;
1003
1004                 contains_another = 0;
1005                 for (j = 0; j < merges.nr; j++) {
1006                         struct commit *m2 = (struct commit *) merges.objects[j].item;
1007                         if (i != j && in_merge_bases(m2, m1)) {
1008                                 contains_another = 1;
1009                                 break;
1010                         }
1011                 }
1012
1013                 if (!contains_another)
1014                         add_object_array(merges.objects[i].item, NULL, result);
1015         }
1016
1017         free(merges.objects);
1018         return result->nr;
1019 }
1020
1021 static void print_commit(struct commit *commit)
1022 {
1023         struct strbuf sb = STRBUF_INIT;
1024         struct pretty_print_context ctx = {0};
1025         ctx.date_mode.type = DATE_NORMAL;
1026         format_commit_message(commit, " %h: %m %s", &sb, &ctx);
1027         fprintf(stderr, "%s\n", sb.buf);
1028         strbuf_release(&sb);
1029 }
1030
1031 #define MERGE_WARNING(path, msg) \
1032         warning("Failed to merge submodule %s (%s)", path, msg);
1033
1034 int merge_submodule(unsigned char result[20], const char *path,
1035                     const unsigned char base[20], const unsigned char a[20],
1036                     const unsigned char b[20], int search)
1037 {
1038         struct commit *commit_base, *commit_a, *commit_b;
1039         int parent_count;
1040         struct object_array merges;
1041
1042         int i;
1043
1044         /* store a in result in case we fail */
1045         hashcpy(result, a);
1046
1047         /* we can not handle deletion conflicts */
1048         if (is_null_sha1(base))
1049                 return 0;
1050         if (is_null_sha1(a))
1051                 return 0;
1052         if (is_null_sha1(b))
1053                 return 0;
1054
1055         if (add_submodule_odb(path)) {
1056                 MERGE_WARNING(path, "not checked out");
1057                 return 0;
1058         }
1059
1060         if (!(commit_base = lookup_commit_reference(base)) ||
1061             !(commit_a = lookup_commit_reference(a)) ||
1062             !(commit_b = lookup_commit_reference(b))) {
1063                 MERGE_WARNING(path, "commits not present");
1064                 return 0;
1065         }
1066
1067         /* check whether both changes are forward */
1068         if (!in_merge_bases(commit_base, commit_a) ||
1069             !in_merge_bases(commit_base, commit_b)) {
1070                 MERGE_WARNING(path, "commits don't follow merge-base");
1071                 return 0;
1072         }
1073
1074         /* Case #1: a is contained in b or vice versa */
1075         if (in_merge_bases(commit_a, commit_b)) {
1076                 hashcpy(result, b);
1077                 return 1;
1078         }
1079         if (in_merge_bases(commit_b, commit_a)) {
1080                 hashcpy(result, a);
1081                 return 1;
1082         }
1083
1084         /*
1085          * Case #2: There are one or more merges that contain a and b in
1086          * the submodule. If there is only one, then present it as a
1087          * suggestion to the user, but leave it marked unmerged so the
1088          * user needs to confirm the resolution.
1089          */
1090
1091         /* Skip the search if makes no sense to the calling context.  */
1092         if (!search)
1093                 return 0;
1094
1095         /* find commit which merges them */
1096         parent_count = find_first_merges(&merges, path, commit_a, commit_b);
1097         switch (parent_count) {
1098         case 0:
1099                 MERGE_WARNING(path, "merge following commits not found");
1100                 break;
1101
1102         case 1:
1103                 MERGE_WARNING(path, "not fast-forward");
1104                 fprintf(stderr, "Found a possible merge resolution "
1105                                 "for the submodule:\n");
1106                 print_commit((struct commit *) merges.objects[0].item);
1107                 fprintf(stderr,
1108                         "If this is correct simply add it to the index "
1109                         "for example\n"
1110                         "by using:\n\n"
1111                         "  git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1112                         "which will accept this suggestion.\n",
1113                         oid_to_hex(&merges.objects[0].item->oid), path);
1114                 break;
1115
1116         default:
1117                 MERGE_WARNING(path, "multiple merges found");
1118                 for (i = 0; i < merges.nr; i++)
1119                         print_commit((struct commit *) merges.objects[i].item);
1120         }
1121
1122         free(merges.objects);
1123         return 0;
1124 }
1125
1126 /* Update gitfile and core.worktree setting to connect work tree and git dir */
1127 void connect_work_tree_and_git_dir(const char *work_tree, const char *git_dir)
1128 {
1129         struct strbuf file_name = STRBUF_INIT;
1130         struct strbuf rel_path = STRBUF_INIT;
1131         const char *real_work_tree = xstrdup(real_path(work_tree));
1132
1133         /* Update gitfile */
1134         strbuf_addf(&file_name, "%s/.git", work_tree);
1135         write_file(file_name.buf, "gitdir: %s",
1136                    relative_path(git_dir, real_work_tree, &rel_path));
1137
1138         /* Update core.worktree setting */
1139         strbuf_reset(&file_name);
1140         strbuf_addf(&file_name, "%s/config", git_dir);
1141         git_config_set_in_file(file_name.buf, "core.worktree",
1142                                relative_path(real_work_tree, git_dir,
1143                                              &rel_path));
1144
1145         strbuf_release(&file_name);
1146         strbuf_release(&rel_path);
1147         free((void *)real_work_tree);
1148 }
1149
1150 int parallel_submodules(void)
1151 {
1152         return parallel_jobs;
1153 }
1154
1155 void prepare_submodule_repo_env(struct argv_array *out)
1156 {
1157         const char * const *var;
1158
1159         for (var = local_repo_env; *var; var++) {
1160                 if (strcmp(*var, CONFIG_DATA_ENVIRONMENT))
1161                         argv_array_push(out, *var);
1162         }
1163         argv_array_push(out, "GIT_DIR=.git");
1164 }