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 #include "worktree.h"
  18
  19 static int config_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND;
  20 static int config_update_recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  21 static int parallel_jobs = 1;
  22 static struct string_list changed_submodule_paths = STRING_LIST_INIT_NODUP;
  23 static int initialized_fetch_ref_tips;
  24 static struct sha1_array ref_tips_before_fetch;
  25 static struct sha1_array ref_tips_after_fetch;
  26
  27 /*
  28  * The following flag is set if the .gitmodules file is unmerged. We then
  29  * disable recursion for all submodules where .git/config doesn't have a
  30  * matching config entry because we can't guess what might be configured in
  31  * .gitmodules unless the user resolves the conflict. When a command line
  32  * option is given (which always overrides configuration) this flag will be
  33  * ignored.
  34  */
  35 static int gitmodules_is_unmerged;
  36
  37 /*
  38  * This flag is set if the .gitmodules file had unstaged modifications on
  39  * startup. This must be checked before allowing modifications to the
  40  * .gitmodules file with the intention to stage them later, because when
  41  * continuing we would stage the modifications the user didn't stage herself
  42  * too. That might change in a future version when we learn to stage the
  43  * changes we do ourselves without staging any previous modifications.
  44  */
  45 static int gitmodules_is_modified;
  46
  47 int is_staging_gitmodules_ok(void)
  48 {
  49         return !gitmodules_is_modified;
  50 }
  51
  52 /*
  53  * Try to update the "path" entry in the "submodule.<name>" section of the
  54  * .gitmodules file. Return 0 only if a .gitmodules file was found, a section
  55  * with the correct path=<oldpath> setting was found and we could update it.
  56  */
  57 int update_path_in_gitmodules(const char *oldpath, const char *newpath)
  58 {
  59         struct strbuf entry = STRBUF_INIT;
  60         const struct submodule *submodule;
  61
  62         if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
  63                 return -1;
  64
  65         if (gitmodules_is_unmerged)
  66                 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
  67
  68         submodule = submodule_from_path(null_sha1, oldpath);
  69         if (!submodule || !submodule->name) {
  70                 warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
  71                 return -1;
  72         }
  73         strbuf_addstr(&entry, "submodule.");
  74         strbuf_addstr(&entry, submodule->name);
  75         strbuf_addstr(&entry, ".path");
  76         if (git_config_set_in_file_gently(".gitmodules", entry.buf, newpath) < 0) {
  77                 /* Maybe the user already did that, don't error out here */
  78                 warning(_("Could not update .gitmodules entry %s"), entry.buf);
  79                 strbuf_release(&entry);
  80                 return -1;
  81         }
  82         strbuf_release(&entry);
  83         return 0;
  84 }
  85
  86 /*
  87  * Try to remove the "submodule.<name>" section from .gitmodules where the given
  88  * path is configured. Return 0 only if a .gitmodules file was found, a section
  89  * with the correct path=<path> setting was found and we could remove it.
  90  */
  91 int remove_path_from_gitmodules(const char *path)
  92 {
  93         struct strbuf sect = STRBUF_INIT;
  94         const struct submodule *submodule;
  95
  96         if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
  97                 return -1;
  98
  99         if (gitmodules_is_unmerged)
 100                 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
 101
 102         submodule = submodule_from_path(null_sha1, path);
 103         if (!submodule || !submodule->name) {
 104                 warning(_("Could not find section in .gitmodules where path=%s"), path);
 105                 return -1;
 106         }
 107         strbuf_addstr(&sect, "submodule.");
 108         strbuf_addstr(&sect, submodule->name);
 109         if (git_config_rename_section_in_file(".gitmodules", sect.buf, NULL) < 0) {
 110                 /* Maybe the user already did that, don't error out here */
 111                 warning(_("Could not remove .gitmodules entry for %s"), path);
 112                 strbuf_release(&sect);
 113                 return -1;
 114         }
 115         strbuf_release(&sect);
 116         return 0;
 117 }
 118
 119 void stage_updated_gitmodules(void)
 120 {
 121         if (add_file_to_cache(".gitmodules", 0))
 122                 die(_("staging updated .gitmodules failed"));
 123 }
 124
 125 static int add_submodule_odb(const char *path)
 126 {
 127         struct strbuf objects_directory = STRBUF_INIT;
 128         int ret = 0;
 129
 130         ret = strbuf_git_path_submodule(&objects_directory, path, "objects/");
 131         if (ret)
 132                 goto done;
 133         if (!is_directory(objects_directory.buf)) {
 134                 ret = -1;
 135                 goto done;
 136         }
 137         add_to_alternates_memory(objects_directory.buf);
 138 done:
 139         strbuf_release(&objects_directory);
 140         return ret;
 141 }
 142
 143 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
 144                                              const char *path)
 145 {
 146         const struct submodule *submodule = submodule_from_path(null_sha1, path);
 147         if (submodule) {
 148                 if (submodule->ignore)
 149                         handle_ignore_submodules_arg(diffopt, submodule->ignore);
 150                 else if (gitmodules_is_unmerged)
 151                         DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 152         }
 153 }
 154
 155 int submodule_config(const char *var, const char *value, void *cb)
 156 {
 157         if (!strcmp(var, "submodule.fetchjobs")) {
 158                 parallel_jobs = git_config_int(var, value);
 159                 if (parallel_jobs < 0)
 160                         die(_("negative values not allowed for submodule.fetchJobs"));
 161                 return 0;
 162         } else if (starts_with(var, "submodule."))
 163                 return parse_submodule_config_option(var, value);
 164         else if (!strcmp(var, "fetch.recursesubmodules")) {
 165                 config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
 166                 return 0;
 167         }
 168         return 0;
 169 }
 170
 171 void gitmodules_config(void)
 172 {
 173         const char *work_tree = get_git_work_tree();
 174         if (work_tree) {
 175                 struct strbuf gitmodules_path = STRBUF_INIT;
 176                 int pos;
 177                 strbuf_addstr(&gitmodules_path, work_tree);
 178                 strbuf_addstr(&gitmodules_path, "/.gitmodules");
 179                 if (read_cache() < 0)
 180                         die("index file corrupt");
 181                 pos = cache_name_pos(".gitmodules", 11);
 182                 if (pos < 0) { /* .gitmodules not found or isn't merged */
 183                         pos = -1 - pos;
 184                         if (active_nr > pos) {  /* there is a .gitmodules */
 185                                 const struct cache_entry *ce = active_cache[pos];
 186                                 if (ce_namelen(ce) == 11 &&
 187                                     !memcmp(ce->name, ".gitmodules", 11))
 188                                         gitmodules_is_unmerged = 1;
 189                         }
 190                 } else if (pos < active_nr) {
 191                         struct stat st;
 192                         if (lstat(".gitmodules", &st) == 0 &&
 193                             ce_match_stat(active_cache[pos], &st, 0) & DATA_CHANGED)
 194                                 gitmodules_is_modified = 1;
 195                 }
 196
 197                 if (!gitmodules_is_unmerged)
 198                         git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
 199                 strbuf_release(&gitmodules_path);
 200         }
 201 }
 202
 203 void gitmodules_config_sha1(const unsigned char *commit_sha1)
 204 {
 205         struct strbuf rev = STRBUF_INIT;
 206         unsigned char sha1[20];
 207
 208         if (gitmodule_sha1_from_commit(commit_sha1, sha1, &rev)) {
 209                 git_config_from_blob_sha1(submodule_config, rev.buf,
 210                                           sha1, NULL);
 211         }
 212         strbuf_release(&rev);
 213 }
 214
 215 /*
 216  * NEEDSWORK: With the addition of different configuration options to determine
 217  * if a submodule is of interests, the validity of this function's name comes
 218  * into question.  Once the dust has settled and more concrete terminology is
 219  * decided upon, come up with a more proper name for this function.  One
 220  * potential candidate could be 'is_submodule_active()'.
 221  *
 222  * Determine if a submodule has been initialized at a given 'path'
 223  */
 224 int is_submodule_initialized(const char *path)
 225 {
 226         int ret = 0;
 227         char *key = NULL;
 228         char *value = NULL;
 229         const struct string_list *sl;
 230         const struct submodule *module = submodule_from_path(null_sha1, path);
 231
 232         /* early return if there isn't a path->module mapping */
 233         if (!module)
 234                 return 0;
 235
 236         /* submodule.<name>.active is set */
 237         key = xstrfmt("submodule.%s.active", module->name);
 238         if (!git_config_get_bool(key, &ret)) {
 239                 free(key);
 240                 return ret;
 241         }
 242         free(key);
 243
 244         /* submodule.active is set */
 245         sl = git_config_get_value_multi("submodule.active");
 246         if (sl) {
 247                 struct pathspec ps;
 248                 struct argv_array args = ARGV_ARRAY_INIT;
 249                 const struct string_list_item *item;
 250
 251                 for_each_string_list_item(item, sl) {
 252                         argv_array_push(&args, item->string);
 253                 }
 254
 255                 parse_pathspec(&ps, 0, 0, NULL, args.argv);
 256                 ret = match_pathspec(&ps, path, strlen(path), 0, NULL, 1);
 257
 258                 argv_array_clear(&args);
 259                 clear_pathspec(&ps);
 260                 return ret;
 261         }
 262
 263         /* fallback to checking if the URL is set */
 264         key = xstrfmt("submodule.%s.url", module->name);
 265         ret = !git_config_get_string(key, &value);
 266
 267         free(value);
 268         free(key);
 269         return ret;
 270 }
 271
 272 int is_submodule_populated_gently(const char *path, int *return_error_code)
 273 {
 274         int ret = 0;
 275         char *gitdir = xstrfmt("%s/.git", path);
 276
 277         if (resolve_gitdir_gently(gitdir, return_error_code))
 278                 ret = 1;
 279
 280         free(gitdir);
 281         return ret;
 282 }
 283
 284 int parse_submodule_update_strategy(const char *value,
 285                 struct submodule_update_strategy *dst)
 286 {
 287         free((void*)dst->command);
 288         dst->command = NULL;
 289         if (!strcmp(value, "none"))
 290                 dst->type = SM_UPDATE_NONE;
 291         else if (!strcmp(value, "checkout"))
 292                 dst->type = SM_UPDATE_CHECKOUT;
 293         else if (!strcmp(value, "rebase"))
 294                 dst->type = SM_UPDATE_REBASE;
 295         else if (!strcmp(value, "merge"))
 296                 dst->type = SM_UPDATE_MERGE;
 297         else if (skip_prefix(value, "!", &value)) {
 298                 dst->type = SM_UPDATE_COMMAND;
 299                 dst->command = xstrdup(value);
 300         } else
 301                 return -1;
 302         return 0;
 303 }
 304
 305 const char *submodule_strategy_to_string(const struct submodule_update_strategy *s)
 306 {
 307         struct strbuf sb = STRBUF_INIT;
 308         switch (s->type) {
 309         case SM_UPDATE_CHECKOUT:
 310                 return "checkout";
 311         case SM_UPDATE_MERGE:
 312                 return "merge";
 313         case SM_UPDATE_REBASE:
 314                 return "rebase";
 315         case SM_UPDATE_NONE:
 316                 return "none";
 317         case SM_UPDATE_UNSPECIFIED:
 318                 return NULL;
 319         case SM_UPDATE_COMMAND:
 320                 strbuf_addf(&sb, "!%s", s->command);
 321                 return strbuf_detach(&sb, NULL);
 322         }
 323         return NULL;
 324 }
 325
 326 void handle_ignore_submodules_arg(struct diff_options *diffopt,
 327                                   const char *arg)
 328 {
 329         DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
 330         DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 331         DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
 332
 333         if (!strcmp(arg, "all"))
 334                 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 335         else if (!strcmp(arg, "untracked"))
 336                 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 337         else if (!strcmp(arg, "dirty"))
 338                 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
 339         else if (strcmp(arg, "none"))
 340                 die("bad --ignore-submodules argument: %s", arg);
 341 }
 342
 343 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
 344                 struct commit *left, struct commit *right,
 345                 struct commit_list *merge_bases)
 346 {
 347         struct commit_list *list;
 348
 349         init_revisions(rev, NULL);
 350         setup_revisions(0, NULL, rev, NULL);
 351         rev->left_right = 1;
 352         rev->first_parent_only = 1;
 353         left->object.flags |= SYMMETRIC_LEFT;
 354         add_pending_object(rev, &left->object, path);
 355         add_pending_object(rev, &right->object, path);
 356         for (list = merge_bases; list; list = list->next) {
 357                 list->item->object.flags |= UNINTERESTING;
 358                 add_pending_object(rev, &list->item->object,
 359                         oid_to_hex(&list->item->object.oid));
 360         }
 361         return prepare_revision_walk(rev);
 362 }
 363
 364 static void print_submodule_summary(struct rev_info *rev, FILE *f,
 365                 const char *line_prefix,
 366                 const char *del, const char *add, const char *reset)
 367 {
 368         static const char format[] = "  %m %s";
 369         struct strbuf sb = STRBUF_INIT;
 370         struct commit *commit;
 371
 372         while ((commit = get_revision(rev))) {
 373                 struct pretty_print_context ctx = {0};
 374                 ctx.date_mode = rev->date_mode;
 375                 ctx.output_encoding = get_log_output_encoding();
 376                 strbuf_setlen(&sb, 0);
 377                 strbuf_addstr(&sb, line_prefix);
 378                 if (commit->object.flags & SYMMETRIC_LEFT) {
 379                         if (del)
 380                                 strbuf_addstr(&sb, del);
 381                 }
 382                 else if (add)
 383                         strbuf_addstr(&sb, add);
 384                 format_commit_message(commit, format, &sb, &ctx);
 385                 if (reset)
 386                         strbuf_addstr(&sb, reset);
 387                 strbuf_addch(&sb, '\n');
 388                 fprintf(f, "%s", sb.buf);
 389         }
 390         strbuf_release(&sb);
 391 }
 392
 393 static void prepare_submodule_repo_env_no_git_dir(struct argv_array *out)
 394 {
 395         const char * const *var;
 396
 397         for (var = local_repo_env; *var; var++) {
 398                 if (strcmp(*var, CONFIG_DATA_ENVIRONMENT))
 399                         argv_array_push(out, *var);
 400         }
 401 }
 402
 403 void prepare_submodule_repo_env(struct argv_array *out)
 404 {
 405         prepare_submodule_repo_env_no_git_dir(out);
 406         argv_array_pushf(out, "%s=%s", GIT_DIR_ENVIRONMENT,
 407                          DEFAULT_GIT_DIR_ENVIRONMENT);
 408 }
 409
 410 /* Helper function to display the submodule header line prior to the full
 411  * summary output. If it can locate the submodule objects directory it will
 412  * attempt to lookup both the left and right commits and put them into the
 413  * left and right pointers.
 414  */
 415 static void show_submodule_header(FILE *f, const char *path,
 416                 const char *line_prefix,
 417                 struct object_id *one, struct object_id *two,
 418                 unsigned dirty_submodule, const char *meta,
 419                 const char *reset,
 420                 struct commit **left, struct commit **right,
 421                 struct commit_list **merge_bases)
 422 {
 423         const char *message = NULL;
 424         struct strbuf sb = STRBUF_INIT;
 425         int fast_forward = 0, fast_backward = 0;
 426
 427         if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
 428                 fprintf(f, "%sSubmodule %s contains untracked content\n",
 429                         line_prefix, path);
 430         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 431                 fprintf(f, "%sSubmodule %s contains modified content\n",
 432                         line_prefix, path);
 433
 434         if (is_null_oid(one))
 435                 message = "(new submodule)";
 436         else if (is_null_oid(two))
 437                 message = "(submodule deleted)";
 438
 439         if (add_submodule_odb(path)) {
 440                 if (!message)
 441                         message = "(not initialized)";
 442                 goto output_header;
 443         }
 444
 445         /*
 446          * Attempt to lookup the commit references, and determine if this is
 447          * a fast forward or fast backwards update.
 448          */
 449         *left = lookup_commit_reference(one->hash);
 450         *right = lookup_commit_reference(two->hash);
 451
 452         /*
 453          * Warn about missing commits in the submodule project, but only if
 454          * they aren't null.
 455          */
 456         if ((!is_null_oid(one) && !*left) ||
 457              (!is_null_oid(two) && !*right))
 458                 message = "(commits not present)";
 459
 460         *merge_bases = get_merge_bases(*left, *right);
 461         if (*merge_bases) {
 462                 if ((*merge_bases)->item == *left)
 463                         fast_forward = 1;
 464                 else if ((*merge_bases)->item == *right)
 465                         fast_backward = 1;
 466         }
 467
 468         if (!oidcmp(one, two)) {
 469                 strbuf_release(&sb);
 470                 return;
 471         }
 472
 473 output_header:
 474         strbuf_addf(&sb, "%s%sSubmodule %s ", line_prefix, meta, path);
 475         strbuf_add_unique_abbrev(&sb, one->hash, DEFAULT_ABBREV);
 476         strbuf_addstr(&sb, (fast_backward || fast_forward) ? ".." : "...");
 477         strbuf_add_unique_abbrev(&sb, two->hash, DEFAULT_ABBREV);
 478         if (message)
 479                 strbuf_addf(&sb, " %s%s\n", message, reset);
 480         else
 481                 strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
 482         fwrite(sb.buf, sb.len, 1, f);
 483
 484         strbuf_release(&sb);
 485 }
 486
 487 void show_submodule_summary(FILE *f, const char *path,
 488                 const char *line_prefix,
 489                 struct object_id *one, struct object_id *two,
 490                 unsigned dirty_submodule, const char *meta,
 491                 const char *del, const char *add, const char *reset)
 492 {
 493         struct rev_info rev;
 494         struct commit *left = NULL, *right = NULL;
 495         struct commit_list *merge_bases = NULL;
 496
 497         show_submodule_header(f, path, line_prefix, one, two, dirty_submodule,
 498                               meta, reset, &left, &right, &merge_bases);
 499
 500         /*
 501          * If we don't have both a left and a right pointer, there is no
 502          * reason to try and display a summary. The header line should contain
 503          * all the information the user needs.
 504          */
 505         if (!left || !right)
 506                 goto out;
 507
 508         /* Treat revision walker failure the same as missing commits */
 509         if (prepare_submodule_summary(&rev, path, left, right, merge_bases)) {
 510                 fprintf(f, "%s(revision walker failed)\n", line_prefix);
 511                 goto out;
 512         }
 513
 514         print_submodule_summary(&rev, f, line_prefix, del, add, reset);
 515
 516 out:
 517         if (merge_bases)
 518                 free_commit_list(merge_bases);
 519         clear_commit_marks(left, ~0);
 520         clear_commit_marks(right, ~0);
 521 }
 522
 523 void show_submodule_inline_diff(FILE *f, const char *path,
 524                 const char *line_prefix,
 525                 struct object_id *one, struct object_id *two,
 526                 unsigned dirty_submodule, const char *meta,
 527                 const char *del, const char *add, const char *reset,
 528                 const struct diff_options *o)
 529 {
 530         const struct object_id *old = &empty_tree_oid, *new = &empty_tree_oid;
 531         struct commit *left = NULL, *right = NULL;
 532         struct commit_list *merge_bases = NULL;
 533         struct strbuf submodule_dir = STRBUF_INIT;
 534         struct child_process cp = CHILD_PROCESS_INIT;
 535
 536         show_submodule_header(f, path, line_prefix, one, two, dirty_submodule,
 537                               meta, reset, &left, &right, &merge_bases);
 538
 539         /* We need a valid left and right commit to display a difference */
 540         if (!(left || is_null_oid(one)) ||
 541             !(right || is_null_oid(two)))
 542                 goto done;
 543
 544         if (left)
 545                 old = one;
 546         if (right)
 547                 new = two;
 548
 549         fflush(f);
 550         cp.git_cmd = 1;
 551         cp.dir = path;
 552         cp.out = dup(fileno(f));
 553         cp.no_stdin = 1;
 554
 555         /* TODO: other options may need to be passed here. */
 556         argv_array_push(&cp.args, "diff");
 557         argv_array_pushf(&cp.args, "--line-prefix=%s", line_prefix);
 558         if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
 559                 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
 560                                  o->b_prefix, path);
 561                 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
 562                                  o->a_prefix, path);
 563         } else {
 564                 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
 565                                  o->a_prefix, path);
 566                 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
 567                                  o->b_prefix, path);
 568         }
 569         argv_array_push(&cp.args, oid_to_hex(old));
 570         /*
 571          * If the submodule has modified content, we will diff against the
 572          * work tree, under the assumption that the user has asked for the
 573          * diff format and wishes to actually see all differences even if they
 574          * haven't yet been committed to the submodule yet.
 575          */
 576         if (!(dirty_submodule & DIRTY_SUBMODULE_MODIFIED))
 577                 argv_array_push(&cp.args, oid_to_hex(new));
 578
 579         prepare_submodule_repo_env(&cp.env_array);
 580         if (run_command(&cp))
 581                 fprintf(f, "(diff failed)\n");
 582
 583 done:
 584         strbuf_release(&submodule_dir);
 585         if (merge_bases)
 586                 free_commit_list(merge_bases);
 587         if (left)
 588                 clear_commit_marks(left, ~0);
 589         if (right)
 590                 clear_commit_marks(right, ~0);
 591 }
 592
 593 void set_config_fetch_recurse_submodules(int value)
 594 {
 595         config_fetch_recurse_submodules = value;
 596 }
 597
 598 void set_config_update_recurse_submodules(int value)
 599 {
 600         config_update_recurse_submodules = value;
 601 }
 602
 603 int should_update_submodules(void)
 604 {
 605         return config_update_recurse_submodules == RECURSE_SUBMODULES_ON;
 606 }
 607
 608 const struct submodule *submodule_from_ce(const struct cache_entry *ce)
 609 {
 610         if (!S_ISGITLINK(ce->ce_mode))
 611                 return NULL;
 612
 613         if (!should_update_submodules())
 614                 return NULL;
 615
 616         return submodule_from_path(null_sha1, ce->name);
 617 }
 618
 619 static int has_remote(const char *refname, const struct object_id *oid,
 620                       int flags, void *cb_data)
 621 {
 622         return 1;
 623 }
 624
 625 static int append_sha1_to_argv(const unsigned char sha1[20], void *data)
 626 {
 627         struct argv_array *argv = data;
 628         argv_array_push(argv, sha1_to_hex(sha1));
 629         return 0;
 630 }
 631
 632 static int check_has_commit(const unsigned char sha1[20], void *data)
 633 {
 634         int *has_commit = data;
 635
 636         if (!lookup_commit_reference(sha1))
 637                 *has_commit = 0;
 638
 639         return 0;
 640 }
 641
 642 static int submodule_has_commits(const char *path, struct sha1_array *commits)
 643 {
 644         int has_commit = 1;
 645
 646         if (add_submodule_odb(path))
 647                 return 0;
 648
 649         sha1_array_for_each_unique(commits, check_has_commit, &has_commit);
 650         return has_commit;
 651 }
 652
 653 static int submodule_needs_pushing(const char *path, struct sha1_array *commits)
 654 {
 655         if (!submodule_has_commits(path, commits))
 656                 /*
 657                  * NOTE: We do consider it safe to return "no" here. The
 658                  * correct answer would be "We do not know" instead of
 659                  * "No push needed", but it is quite hard to change
 660                  * the submodule pointer without having the submodule
 661                  * around. If a user did however change the submodules
 662                  * without having the submodule around, this indicates
 663                  * an expert who knows what they are doing or a
 664                  * maintainer integrating work from other people. In
 665                  * both cases it should be safe to skip this check.
 666                  */
 667                 return 0;
 668
 669         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 670                 struct child_process cp = CHILD_PROCESS_INIT;
 671                 struct strbuf buf = STRBUF_INIT;
 672                 int needs_pushing = 0;
 673
 674                 argv_array_push(&cp.args, "rev-list");
 675                 sha1_array_for_each_unique(commits, append_sha1_to_argv, &cp.args);
 676                 argv_array_pushl(&cp.args, "--not", "--remotes", "-n", "1" , NULL);
 677
 678                 prepare_submodule_repo_env(&cp.env_array);
 679                 cp.git_cmd = 1;
 680                 cp.no_stdin = 1;
 681                 cp.out = -1;
 682                 cp.dir = path;
 683                 if (start_command(&cp))
 684                         die("Could not run 'git rev-list <commits> --not --remotes -n 1' command in submodule %s",
 685                                         path);
 686                 if (strbuf_read(&buf, cp.out, 41))
 687                         needs_pushing = 1;
 688                 finish_command(&cp);
 689                 close(cp.out);
 690                 strbuf_release(&buf);
 691                 return needs_pushing;
 692         }
 693
 694         return 0;
 695 }
 696
 697 static struct sha1_array *submodule_commits(struct string_list *submodules,
 698                                             const char *path)
 699 {
 700         struct string_list_item *item;
 701
 702         item = string_list_insert(submodules, path);
 703         if (item->util)
 704                 return (struct sha1_array *) item->util;
 705
 706         /* NEEDSWORK: should we have sha1_array_init()? */
 707         item->util = xcalloc(1, sizeof(struct sha1_array));
 708         return (struct sha1_array *) item->util;
 709 }
 710
 711 static void collect_submodules_from_diff(struct diff_queue_struct *q,
 712                                          struct diff_options *options,
 713                                          void *data)
 714 {
 715         int i;
 716         struct string_list *submodules = data;
 717
 718         for (i = 0; i < q->nr; i++) {
 719                 struct diff_filepair *p = q->queue[i];
 720                 struct sha1_array *commits;
 721                 if (!S_ISGITLINK(p->two->mode))
 722                         continue;
 723                 commits = submodule_commits(submodules, p->two->path);
 724                 sha1_array_append(commits, p->two->oid.hash);
 725         }
 726 }
 727
 728 static void find_unpushed_submodule_commits(struct commit *commit,
 729                 struct string_list *needs_pushing)
 730 {
 731         struct rev_info rev;
 732
 733         init_revisions(&rev, NULL);
 734         rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
 735         rev.diffopt.format_callback = collect_submodules_from_diff;
 736         rev.diffopt.format_callback_data = needs_pushing;
 737         diff_tree_combined_merge(commit, 1, &rev);
 738 }
 739
 740 static void free_submodules_sha1s(struct string_list *submodules)
 741 {
 742         struct string_list_item *item;
 743         for_each_string_list_item(item, submodules)
 744                 sha1_array_clear((struct sha1_array *) item->util);
 745         string_list_clear(submodules, 1);
 746 }
 747
 748 int find_unpushed_submodules(struct sha1_array *commits,
 749                 const char *remotes_name, struct string_list *needs_pushing)
 750 {
 751         struct rev_info rev;
 752         struct commit *commit;
 753         struct string_list submodules = STRING_LIST_INIT_DUP;
 754         struct string_list_item *submodule;
 755         struct argv_array argv = ARGV_ARRAY_INIT;
 756
 757         init_revisions(&rev, NULL);
 758
 759         /* argv.argv[0] will be ignored by setup_revisions */
 760         argv_array_push(&argv, "find_unpushed_submodules");
 761         sha1_array_for_each_unique(commits, append_sha1_to_argv, &argv);
 762         argv_array_push(&argv, "--not");
 763         argv_array_pushf(&argv, "--remotes=%s", remotes_name);
 764
 765         setup_revisions(argv.argc, argv.argv, &rev, NULL);
 766         if (prepare_revision_walk(&rev))
 767                 die("revision walk setup failed");
 768
 769         while ((commit = get_revision(&rev)) != NULL)
 770                 find_unpushed_submodule_commits(commit, &submodules);
 771
 772         reset_revision_walk();
 773         argv_array_clear(&argv);
 774
 775         for_each_string_list_item(submodule, &submodules) {
 776                 struct sha1_array *commits = (struct sha1_array *) submodule->util;
 777
 778                 if (submodule_needs_pushing(submodule->string, commits))
 779                         string_list_insert(needs_pushing, submodule->string);
 780         }
 781         free_submodules_sha1s(&submodules);
 782
 783         return needs_pushing->nr;
 784 }
 785
 786 static int push_submodule(const char *path, int dry_run)
 787 {
 788         if (add_submodule_odb(path))
 789                 return 1;
 790
 791         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 792                 struct child_process cp = CHILD_PROCESS_INIT;
 793                 argv_array_push(&cp.args, "push");
 794                 if (dry_run)
 795                         argv_array_push(&cp.args, "--dry-run");
 796
 797                 prepare_submodule_repo_env(&cp.env_array);
 798                 cp.git_cmd = 1;
 799                 cp.no_stdin = 1;
 800                 cp.dir = path;
 801                 if (run_command(&cp))
 802                         return 0;
 803                 close(cp.out);
 804         }
 805
 806         return 1;
 807 }
 808
 809 int push_unpushed_submodules(struct sha1_array *commits,
 810                              const char *remotes_name,
 811                              int dry_run)
 812 {
 813         int i, ret = 1;
 814         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 815
 816         if (!find_unpushed_submodules(commits, remotes_name, &needs_pushing))
 817                 return 1;
 818
 819         for (i = 0; i < needs_pushing.nr; i++) {
 820                 const char *path = needs_pushing.items[i].string;
 821                 fprintf(stderr, "Pushing submodule '%s'\n", path);
 822                 if (!push_submodule(path, dry_run)) {
 823                         fprintf(stderr, "Unable to push submodule '%s'\n", path);
 824                         ret = 0;
 825                 }
 826         }
 827
 828         string_list_clear(&needs_pushing, 0);
 829
 830         return ret;
 831 }
 832
 833 static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
 834 {
 835         int is_present = 0;
 836         if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
 837                 /* Even if the submodule is checked out and the commit is
 838                  * present, make sure it is reachable from a ref. */
 839                 struct child_process cp = CHILD_PROCESS_INIT;
 840                 const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
 841                 struct strbuf buf = STRBUF_INIT;
 842
 843                 argv[3] = sha1_to_hex(sha1);
 844                 cp.argv = argv;
 845                 prepare_submodule_repo_env(&cp.env_array);
 846                 cp.git_cmd = 1;
 847                 cp.no_stdin = 1;
 848                 cp.dir = path;
 849                 if (!capture_command(&cp, &buf, 1024) && !buf.len)
 850                         is_present = 1;
 851
 852                 strbuf_release(&buf);
 853         }
 854         return is_present;
 855 }
 856
 857 static void submodule_collect_changed_cb(struct diff_queue_struct *q,
 858                                          struct diff_options *options,
 859                                          void *data)
 860 {
 861         int i;
 862         for (i = 0; i < q->nr; i++) {
 863                 struct diff_filepair *p = q->queue[i];
 864                 if (!S_ISGITLINK(p->two->mode))
 865                         continue;
 866
 867                 if (S_ISGITLINK(p->one->mode)) {
 868                         /* NEEDSWORK: We should honor the name configured in
 869                          * the .gitmodules file of the commit we are examining
 870                          * here to be able to correctly follow submodules
 871                          * being moved around. */
 872                         struct string_list_item *path;
 873                         path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
 874                         if (!path && !is_submodule_commit_present(p->two->path, p->two->oid.hash))
 875                                 string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
 876                 } else {
 877                         /* Submodule is new or was moved here */
 878                         /* NEEDSWORK: When the .git directories of submodules
 879                          * live inside the superprojects .git directory some
 880                          * day we should fetch new submodules directly into
 881                          * that location too when config or options request
 882                          * that so they can be checked out from there. */
 883                         continue;
 884                 }
 885         }
 886 }
 887
 888 static int add_sha1_to_array(const char *ref, const struct object_id *oid,
 889                              int flags, void *data)
 890 {
 891         sha1_array_append(data, oid->hash);
 892         return 0;
 893 }
 894
 895 void check_for_new_submodule_commits(unsigned char new_sha1[20])
 896 {
 897         if (!initialized_fetch_ref_tips) {
 898                 for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
 899                 initialized_fetch_ref_tips = 1;
 900         }
 901
 902         sha1_array_append(&ref_tips_after_fetch, new_sha1);
 903 }
 904
 905 static int add_sha1_to_argv(const unsigned char sha1[20], void *data)
 906 {
 907         argv_array_push(data, sha1_to_hex(sha1));
 908         return 0;
 909 }
 910
 911 static void calculate_changed_submodule_paths(void)
 912 {
 913         struct rev_info rev;
 914         struct commit *commit;
 915         struct argv_array argv = ARGV_ARRAY_INIT;
 916
 917         /* No need to check if there are no submodules configured */
 918         if (!submodule_from_path(NULL, NULL))
 919                 return;
 920
 921         init_revisions(&rev, NULL);
 922         argv_array_push(&argv, "--"); /* argv[0] program name */
 923         sha1_array_for_each_unique(&ref_tips_after_fetch,
 924                                    add_sha1_to_argv, &argv);
 925         argv_array_push(&argv, "--not");
 926         sha1_array_for_each_unique(&ref_tips_before_fetch,
 927                                    add_sha1_to_argv, &argv);
 928         setup_revisions(argv.argc, argv.argv, &rev, NULL);
 929         if (prepare_revision_walk(&rev))
 930                 die("revision walk setup failed");
 931
 932         /*
 933          * Collect all submodules (whether checked out or not) for which new
 934          * commits have been recorded upstream in "changed_submodule_paths".
 935          */
 936         while ((commit = get_revision(&rev))) {
 937                 struct commit_list *parent = commit->parents;
 938                 while (parent) {
 939                         struct diff_options diff_opts;
 940                         diff_setup(&diff_opts);
 941                         DIFF_OPT_SET(&diff_opts, RECURSIVE);
 942                         diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
 943                         diff_opts.format_callback = submodule_collect_changed_cb;
 944                         diff_setup_done(&diff_opts);
 945                         diff_tree_sha1(parent->item->object.oid.hash, commit->object.oid.hash, "", &diff_opts);
 946                         diffcore_std(&diff_opts);
 947                         diff_flush(&diff_opts);
 948                         parent = parent->next;
 949                 }
 950         }
 951
 952         argv_array_clear(&argv);
 953         sha1_array_clear(&ref_tips_before_fetch);
 954         sha1_array_clear(&ref_tips_after_fetch);
 955         initialized_fetch_ref_tips = 0;
 956 }
 957
 958 struct submodule_parallel_fetch {
 959         int count;
 960         struct argv_array args;
 961         const char *work_tree;
 962         const char *prefix;
 963         int command_line_option;
 964         int quiet;
 965         int result;
 966 };
 967 #define SPF_INIT {0, ARGV_ARRAY_INIT, NULL, NULL, 0, 0, 0}
 968
 969 static int get_next_submodule(struct child_process *cp,
 970                               struct strbuf *err, void *data, void **task_cb)
 971 {
 972         int ret = 0;
 973         struct submodule_parallel_fetch *spf = data;
 974
 975         for (; spf->count < active_nr; spf->count++) {
 976                 struct strbuf submodule_path = STRBUF_INIT;
 977                 struct strbuf submodule_git_dir = STRBUF_INIT;
 978                 struct strbuf submodule_prefix = STRBUF_INIT;
 979                 const struct cache_entry *ce = active_cache[spf->count];
 980                 const char *git_dir, *default_argv;
 981                 const struct submodule *submodule;
 982
 983                 if (!S_ISGITLINK(ce->ce_mode))
 984                         continue;
 985
 986                 submodule = submodule_from_path(null_sha1, ce->name);
 987                 if (!submodule)
 988                         submodule = submodule_from_name(null_sha1, ce->name);
 989
 990                 default_argv = "yes";
 991                 if (spf->command_line_option == RECURSE_SUBMODULES_DEFAULT) {
 992                         if (submodule &&
 993                             submodule->fetch_recurse !=
 994                                                 RECURSE_SUBMODULES_NONE) {
 995                                 if (submodule->fetch_recurse ==
 996                                                 RECURSE_SUBMODULES_OFF)
 997                                         continue;
 998                                 if (submodule->fetch_recurse ==
 999                                                 RECURSE_SUBMODULES_ON_DEMAND) {
1000                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
1001                                                 continue;
1002                                         default_argv = "on-demand";
1003                                 }
1004                         } else {
1005                                 if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
1006                                     gitmodules_is_unmerged)
1007                                         continue;
1008                                 if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
1009                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
1010                                                 continue;
1011                                         default_argv = "on-demand";
1012                                 }
1013                         }
1014                 } else if (spf->command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
1015                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
1016                                 continue;
1017                         default_argv = "on-demand";
1018                 }
1019
1020                 strbuf_addf(&submodule_path, "%s/%s", spf->work_tree, ce->name);
1021                 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
1022                 strbuf_addf(&submodule_prefix, "%s%s/", spf->prefix, ce->name);
1023                 git_dir = read_gitfile(submodule_git_dir.buf);
1024                 if (!git_dir)
1025                         git_dir = submodule_git_dir.buf;
1026                 if (is_directory(git_dir)) {
1027                         child_process_init(cp);
1028                         cp->dir = strbuf_detach(&submodule_path, NULL);
1029                         prepare_submodule_repo_env(&cp->env_array);
1030                         cp->git_cmd = 1;
1031                         if (!spf->quiet)
1032                                 strbuf_addf(err, "Fetching submodule %s%s\n",
1033                                             spf->prefix, ce->name);
1034                         argv_array_init(&cp->args);
1035                         argv_array_pushv(&cp->args, spf->args.argv);
1036                         argv_array_push(&cp->args, default_argv);
1037                         argv_array_push(&cp->args, "--submodule-prefix");
1038                         argv_array_push(&cp->args, submodule_prefix.buf);
1039                         ret = 1;
1040                 }
1041                 strbuf_release(&submodule_path);
1042                 strbuf_release(&submodule_git_dir);
1043                 strbuf_release(&submodule_prefix);
1044                 if (ret) {
1045                         spf->count++;
1046                         return 1;
1047                 }
1048         }
1049         return 0;
1050 }
1051
1052 static int fetch_start_failure(struct strbuf *err,
1053                                void *cb, void *task_cb)
1054 {
1055         struct submodule_parallel_fetch *spf = cb;
1056
1057         spf->result = 1;
1058
1059         return 0;
1060 }
1061
1062 static int fetch_finish(int retvalue, struct strbuf *err,
1063                         void *cb, void *task_cb)
1064 {
1065         struct submodule_parallel_fetch *spf = cb;
1066
1067         if (retvalue)
1068                 spf->result = 1;
1069
1070         return 0;
1071 }
1072
1073 int fetch_populated_submodules(const struct argv_array *options,
1074                                const char *prefix, int command_line_option,
1075                                int quiet, int max_parallel_jobs)
1076 {
1077         int i;
1078         struct submodule_parallel_fetch spf = SPF_INIT;
1079
1080         spf.work_tree = get_git_work_tree();
1081         spf.command_line_option = command_line_option;
1082         spf.quiet = quiet;
1083         spf.prefix = prefix;
1084
1085         if (!spf.work_tree)
1086                 goto out;
1087
1088         if (read_cache() < 0)
1089                 die("index file corrupt");
1090
1091         argv_array_push(&spf.args, "fetch");
1092         for (i = 0; i < options->argc; i++)
1093                 argv_array_push(&spf.args, options->argv[i]);
1094         argv_array_push(&spf.args, "--recurse-submodules-default");
1095         /* default value, "--submodule-prefix" and its value are added later */
1096
1097         if (max_parallel_jobs < 0)
1098                 max_parallel_jobs = parallel_jobs;
1099
1100         calculate_changed_submodule_paths();
1101         run_processes_parallel(max_parallel_jobs,
1102                                get_next_submodule,
1103                                fetch_start_failure,
1104                                fetch_finish,
1105                                &spf);
1106
1107         argv_array_clear(&spf.args);
1108 out:
1109         string_list_clear(&changed_submodule_paths, 1);
1110         return spf.result;
1111 }
1112
1113 unsigned is_submodule_modified(const char *path, int ignore_untracked)
1114 {
1115         ssize_t len;
1116         struct child_process cp = CHILD_PROCESS_INIT;
1117         const char *argv[] = {
1118                 "status",
1119                 "--porcelain",
1120                 NULL,
1121                 NULL,
1122         };
1123         struct strbuf buf = STRBUF_INIT;
1124         unsigned dirty_submodule = 0;
1125         const char *line, *next_line;
1126         const char *git_dir;
1127
1128         strbuf_addf(&buf, "%s/.git", path);
1129         git_dir = read_gitfile(buf.buf);
1130         if (!git_dir)
1131                 git_dir = buf.buf;
1132         if (!is_directory(git_dir)) {
1133                 strbuf_release(&buf);
1134                 /* The submodule is not checked out, so it is not modified */
1135                 return 0;
1136
1137         }
1138         strbuf_reset(&buf);
1139
1140         if (ignore_untracked)
1141                 argv[2] = "-uno";
1142
1143         cp.argv = argv;
1144         prepare_submodule_repo_env(&cp.env_array);
1145         cp.git_cmd = 1;
1146         cp.no_stdin = 1;
1147         cp.out = -1;
1148         cp.dir = path;
1149         if (start_command(&cp))
1150                 die("Could not run 'git status --porcelain' in submodule %s", path);
1151
1152         len = strbuf_read(&buf, cp.out, 1024);
1153         line = buf.buf;
1154         while (len > 2) {
1155                 if ((line[0] == '?') && (line[1] == '?')) {
1156                         dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
1157                         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
1158                                 break;
1159                 } else {
1160                         dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
1161                         if (ignore_untracked ||
1162                             (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
1163                                 break;
1164                 }
1165                 next_line = strchr(line, '\n');
1166                 if (!next_line)
1167                         break;
1168                 next_line++;
1169                 len -= (next_line - line);
1170                 line = next_line;
1171         }
1172         close(cp.out);
1173
1174         if (finish_command(&cp))
1175                 die("'git status --porcelain' failed in submodule %s", path);
1176
1177         strbuf_release(&buf);
1178         return dirty_submodule;
1179 }
1180
1181 int submodule_uses_gitfile(const char *path)
1182 {
1183         struct child_process cp = CHILD_PROCESS_INIT;
1184         const char *argv[] = {
1185                 "submodule",
1186                 "foreach",
1187                 "--quiet",
1188                 "--recursive",
1189                 "test -f .git",
1190                 NULL,
1191         };
1192         struct strbuf buf = STRBUF_INIT;
1193         const char *git_dir;
1194
1195         strbuf_addf(&buf, "%s/.git", path);
1196         git_dir = read_gitfile(buf.buf);
1197         if (!git_dir) {
1198                 strbuf_release(&buf);
1199                 return 0;
1200         }
1201         strbuf_release(&buf);
1202
1203         /* Now test that all nested submodules use a gitfile too */
1204         cp.argv = argv;
1205         prepare_submodule_repo_env(&cp.env_array);
1206         cp.git_cmd = 1;
1207         cp.no_stdin = 1;
1208         cp.no_stderr = 1;
1209         cp.no_stdout = 1;
1210         cp.dir = path;
1211         if (run_command(&cp))
1212                 return 0;
1213
1214         return 1;
1215 }
1216
1217 /*
1218  * Check if it is a bad idea to remove a submodule, i.e. if we'd lose data
1219  * when doing so.
1220  *
1221  * Return 1 if we'd lose data, return 0 if the removal is fine,
1222  * and negative values for errors.
1223  */
1224 int bad_to_remove_submodule(const char *path, unsigned flags)
1225 {
1226         ssize_t len;
1227         struct child_process cp = CHILD_PROCESS_INIT;
1228         struct strbuf buf = STRBUF_INIT;
1229         int ret = 0;
1230
1231         if (!file_exists(path) || is_empty_dir(path))
1232                 return 0;
1233
1234         if (!submodule_uses_gitfile(path))
1235                 return 1;
1236
1237         argv_array_pushl(&cp.args, "status", "--porcelain",
1238                                    "--ignore-submodules=none", NULL);
1239
1240         if (flags & SUBMODULE_REMOVAL_IGNORE_UNTRACKED)
1241                 argv_array_push(&cp.args, "-uno");
1242         else
1243                 argv_array_push(&cp.args, "-uall");
1244
1245         if (!(flags & SUBMODULE_REMOVAL_IGNORE_IGNORED_UNTRACKED))
1246                 argv_array_push(&cp.args, "--ignored");
1247
1248         prepare_submodule_repo_env(&cp.env_array);
1249         cp.git_cmd = 1;
1250         cp.no_stdin = 1;
1251         cp.out = -1;
1252         cp.dir = path;
1253         if (start_command(&cp)) {
1254                 if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
1255                         die(_("could not start 'git status in submodule '%s'"),
1256                                 path);
1257                 ret = -1;
1258                 goto out;
1259         }
1260
1261         len = strbuf_read(&buf, cp.out, 1024);
1262         if (len > 2)
1263                 ret = 1;
1264         close(cp.out);
1265
1266         if (finish_command(&cp)) {
1267                 if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
1268                         die(_("could not run 'git status in submodule '%s'"),
1269                                 path);
1270                 ret = -1;
1271         }
1272 out:
1273         strbuf_release(&buf);
1274         return ret;
1275 }
1276
1277 static const char *get_super_prefix_or_empty(void)
1278 {
1279         const char *s = get_super_prefix();
1280         if (!s)
1281                 s = "";
1282         return s;
1283 }
1284
1285 static int submodule_has_dirty_index(const struct submodule *sub)
1286 {
1287         struct child_process cp = CHILD_PROCESS_INIT;
1288
1289         prepare_submodule_repo_env_no_git_dir(&cp.env_array);
1290
1291         cp.git_cmd = 1;
1292         argv_array_pushl(&cp.args, "diff-index", "--quiet",
1293                                    "--cached", "HEAD", NULL);
1294         cp.no_stdin = 1;
1295         cp.no_stdout = 1;
1296         cp.dir = sub->path;
1297         if (start_command(&cp))
1298                 die("could not recurse into submodule '%s'", sub->path);
1299
1300         return finish_command(&cp);
1301 }
1302
1303 static void submodule_reset_index(const char *path)
1304 {
1305         struct child_process cp = CHILD_PROCESS_INIT;
1306         prepare_submodule_repo_env_no_git_dir(&cp.env_array);
1307
1308         cp.git_cmd = 1;
1309         cp.no_stdin = 1;
1310         cp.dir = path;
1311
1312         argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
1313                                    get_super_prefix_or_empty(), path);
1314         argv_array_pushl(&cp.args, "read-tree", "-u", "--reset", NULL);
1315
1316         argv_array_push(&cp.args, EMPTY_TREE_SHA1_HEX);
1317
1318         if (run_command(&cp))
1319                 die("could not reset submodule index");
1320 }
1321
1322 /**
1323  * Moves a submodule at a given path from a given head to another new head.
1324  * For edge cases (a submodule coming into existence or removing a submodule)
1325  * pass NULL for old or new respectively.
1326  */
1327 int submodule_move_head(const char *path,
1328                          const char *old,
1329                          const char *new,
1330                          unsigned flags)
1331 {
1332         int ret = 0;
1333         struct child_process cp = CHILD_PROCESS_INIT;
1334         const struct submodule *sub;
1335
1336         sub = submodule_from_path(null_sha1, path);
1337
1338         if (!sub)
1339                 die("BUG: could not get submodule information for '%s'", path);
1340
1341         if (old && !(flags & SUBMODULE_MOVE_HEAD_FORCE)) {
1342                 /* Check if the submodule has a dirty index. */
1343                 if (submodule_has_dirty_index(sub))
1344                         return error(_("submodule '%s' has dirty index"), path);
1345         }
1346
1347         if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
1348                 if (old) {
1349                         if (!submodule_uses_gitfile(path))
1350                                 absorb_git_dir_into_superproject("", path,
1351                                         ABSORB_GITDIR_RECURSE_SUBMODULES);
1352                 } else {
1353                         struct strbuf sb = STRBUF_INIT;
1354                         strbuf_addf(&sb, "%s/modules/%s",
1355                                     get_git_common_dir(), sub->name);
1356                         connect_work_tree_and_git_dir(path, sb.buf);
1357                         strbuf_release(&sb);
1358
1359                         /* make sure the index is clean as well */
1360                         submodule_reset_index(path);
1361                 }
1362         }
1363
1364         prepare_submodule_repo_env_no_git_dir(&cp.env_array);
1365
1366         cp.git_cmd = 1;
1367         cp.no_stdin = 1;
1368         cp.dir = path;
1369
1370         argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
1371                         get_super_prefix_or_empty(), path);
1372         argv_array_pushl(&cp.args, "read-tree", NULL);
1373
1374         if (flags & SUBMODULE_MOVE_HEAD_DRY_RUN)
1375                 argv_array_push(&cp.args, "-n");
1376         else
1377                 argv_array_push(&cp.args, "-u");
1378
1379         if (flags & SUBMODULE_MOVE_HEAD_FORCE)
1380                 argv_array_push(&cp.args, "--reset");
1381         else
1382                 argv_array_push(&cp.args, "-m");
1383
1384         argv_array_push(&cp.args, old ? old : EMPTY_TREE_SHA1_HEX);
1385         argv_array_push(&cp.args, new ? new : EMPTY_TREE_SHA1_HEX);
1386
1387         if (run_command(&cp)) {
1388                 ret = -1;
1389                 goto out;
1390         }
1391
1392         if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
1393                 if (new) {
1394                         struct child_process cp1 = CHILD_PROCESS_INIT;
1395                         /* also set the HEAD accordingly */
1396                         cp1.git_cmd = 1;
1397                         cp1.no_stdin = 1;
1398                         cp1.dir = path;
1399
1400                         argv_array_pushl(&cp1.args, "update-ref", "HEAD",
1401                                          new ? new : EMPTY_TREE_SHA1_HEX, NULL);
1402
1403                         if (run_command(&cp1)) {
1404                                 ret = -1;
1405                                 goto out;
1406                         }
1407                 } else {
1408                         struct strbuf sb = STRBUF_INIT;
1409
1410                         strbuf_addf(&sb, "%s/.git", path);
1411                         unlink_or_warn(sb.buf);
1412                         strbuf_release(&sb);
1413
1414                         if (is_empty_dir(path))
1415                                 rmdir_or_warn(path);
1416                 }
1417         }
1418 out:
1419         return ret;
1420 }
1421
1422 static int find_first_merges(struct object_array *result, const char *path,
1423                 struct commit *a, struct commit *b)
1424 {
1425         int i, j;
1426         struct object_array merges = OBJECT_ARRAY_INIT;
1427         struct commit *commit;
1428         int contains_another;
1429
1430         char merged_revision[42];
1431         const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
1432                                    "--all", merged_revision, NULL };
1433         struct rev_info revs;
1434         struct setup_revision_opt rev_opts;
1435
1436         memset(result, 0, sizeof(struct object_array));
1437         memset(&rev_opts, 0, sizeof(rev_opts));
1438
1439         /* get all revisions that merge commit a */
1440         xsnprintf(merged_revision, sizeof(merged_revision), "^%s",
1441                         oid_to_hex(&a->object.oid));
1442         init_revisions(&revs, NULL);
1443         rev_opts.submodule = path;
1444         setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
1445
1446         /* save all revisions from the above list that contain b */
1447         if (prepare_revision_walk(&revs))
1448                 die("revision walk setup failed");
1449         while ((commit = get_revision(&revs)) != NULL) {
1450                 struct object *o = &(commit->object);
1451                 if (in_merge_bases(b, commit))
1452                         add_object_array(o, NULL, &merges);
1453         }
1454         reset_revision_walk();
1455
1456         /* Now we've got all merges that contain a and b. Prune all
1457          * merges that contain another found merge and save them in
1458          * result.
1459          */
1460         for (i = 0; i < merges.nr; i++) {
1461                 struct commit *m1 = (struct commit *) merges.objects[i].item;
1462
1463                 contains_another = 0;
1464                 for (j = 0; j < merges.nr; j++) {
1465                         struct commit *m2 = (struct commit *) merges.objects[j].item;
1466                         if (i != j && in_merge_bases(m2, m1)) {
1467                                 contains_another = 1;
1468                                 break;
1469                         }
1470                 }
1471
1472                 if (!contains_another)
1473                         add_object_array(merges.objects[i].item, NULL, result);
1474         }
1475
1476         free(merges.objects);
1477         return result->nr;
1478 }
1479
1480 static void print_commit(struct commit *commit)
1481 {
1482         struct strbuf sb = STRBUF_INIT;
1483         struct pretty_print_context ctx = {0};
1484         ctx.date_mode.type = DATE_NORMAL;
1485         format_commit_message(commit, " %h: %m %s", &sb, &ctx);
1486         fprintf(stderr, "%s\n", sb.buf);
1487         strbuf_release(&sb);
1488 }
1489
1490 #define MERGE_WARNING(path, msg) \
1491         warning("Failed to merge submodule %s (%s)", path, msg);
1492
1493 int merge_submodule(unsigned char result[20], const char *path,
1494                     const unsigned char base[20], const unsigned char a[20],
1495                     const unsigned char b[20], int search)
1496 {
1497         struct commit *commit_base, *commit_a, *commit_b;
1498         int parent_count;
1499         struct object_array merges;
1500
1501         int i;
1502
1503         /* store a in result in case we fail */
1504         hashcpy(result, a);
1505
1506         /* we can not handle deletion conflicts */
1507         if (is_null_sha1(base))
1508                 return 0;
1509         if (is_null_sha1(a))
1510                 return 0;
1511         if (is_null_sha1(b))
1512                 return 0;
1513
1514         if (add_submodule_odb(path)) {
1515                 MERGE_WARNING(path, "not checked out");
1516                 return 0;
1517         }
1518
1519         if (!(commit_base = lookup_commit_reference(base)) ||
1520             !(commit_a = lookup_commit_reference(a)) ||
1521             !(commit_b = lookup_commit_reference(b))) {
1522                 MERGE_WARNING(path, "commits not present");
1523                 return 0;
1524         }
1525
1526         /* check whether both changes are forward */
1527         if (!in_merge_bases(commit_base, commit_a) ||
1528             !in_merge_bases(commit_base, commit_b)) {
1529                 MERGE_WARNING(path, "commits don't follow merge-base");
1530                 return 0;
1531         }
1532
1533         /* Case #1: a is contained in b or vice versa */
1534         if (in_merge_bases(commit_a, commit_b)) {
1535                 hashcpy(result, b);
1536                 return 1;
1537         }
1538         if (in_merge_bases(commit_b, commit_a)) {
1539                 hashcpy(result, a);
1540                 return 1;
1541         }
1542
1543         /*
1544          * Case #2: There are one or more merges that contain a and b in
1545          * the submodule. If there is only one, then present it as a
1546          * suggestion to the user, but leave it marked unmerged so the
1547          * user needs to confirm the resolution.
1548          */
1549
1550         /* Skip the search if makes no sense to the calling context.  */
1551         if (!search)
1552                 return 0;
1553
1554         /* find commit which merges them */
1555         parent_count = find_first_merges(&merges, path, commit_a, commit_b);
1556         switch (parent_count) {
1557         case 0:
1558                 MERGE_WARNING(path, "merge following commits not found");
1559                 break;
1560
1561         case 1:
1562                 MERGE_WARNING(path, "not fast-forward");
1563                 fprintf(stderr, "Found a possible merge resolution "
1564                                 "for the submodule:\n");
1565                 print_commit((struct commit *) merges.objects[0].item);
1566                 fprintf(stderr,
1567                         "If this is correct simply add it to the index "
1568                         "for example\n"
1569                         "by using:\n\n"
1570                         "  git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1571                         "which will accept this suggestion.\n",
1572                         oid_to_hex(&merges.objects[0].item->oid), path);
1573                 break;
1574
1575         default:
1576                 MERGE_WARNING(path, "multiple merges found");
1577                 for (i = 0; i < merges.nr; i++)
1578                         print_commit((struct commit *) merges.objects[i].item);
1579         }
1580
1581         free(merges.objects);
1582         return 0;
1583 }
1584
1585 int parallel_submodules(void)
1586 {
1587         return parallel_jobs;
1588 }
1589
1590 /*
1591  * Embeds a single submodules git directory into the superprojects git dir,
1592  * non recursively.
1593  */
1594 static void relocate_single_git_dir_into_superproject(const char *prefix,
1595                                                       const char *path)
1596 {
1597         char *old_git_dir = NULL, *real_old_git_dir = NULL, *real_new_git_dir = NULL;
1598         const char *new_git_dir;
1599         const struct submodule *sub;
1600
1601         if (submodule_uses_worktrees(path))
1602                 die(_("relocate_gitdir for submodule '%s' with "
1603                       "more than one worktree not supported"), path);
1604
1605         old_git_dir = xstrfmt("%s/.git", path);
1606         if (read_gitfile(old_git_dir))
1607                 /* If it is an actual gitfile, it doesn't need migration. */
1608                 return;
1609
1610         real_old_git_dir = real_pathdup(old_git_dir, 1);
1611
1612         sub = submodule_from_path(null_sha1, path);
1613         if (!sub)
1614                 die(_("could not lookup name for submodule '%s'"), path);
1615
1616         new_git_dir = git_path("modules/%s", sub->name);
1617         if (safe_create_leading_directories_const(new_git_dir) < 0)
1618                 die(_("could not create directory '%s'"), new_git_dir);
1619         real_new_git_dir = real_pathdup(new_git_dir, 1);
1620
1621         fprintf(stderr, _("Migrating git directory of '%s%s' from\n'%s' to\n'%s'\n"),
1622                 get_super_prefix_or_empty(), path,
1623                 real_old_git_dir, real_new_git_dir);
1624
1625         relocate_gitdir(path, real_old_git_dir, real_new_git_dir);
1626
1627         free(old_git_dir);
1628         free(real_old_git_dir);
1629         free(real_new_git_dir);
1630 }
1631
1632 /*
1633  * Migrate the git directory of the submodule given by path from
1634  * having its git directory within the working tree to the git dir nested
1635  * in its superprojects git dir under modules/.
1636  */
1637 void absorb_git_dir_into_superproject(const char *prefix,
1638                                       const char *path,
1639                                       unsigned flags)
1640 {
1641         int err_code;
1642         const char *sub_git_dir;
1643         struct strbuf gitdir = STRBUF_INIT;
1644         strbuf_addf(&gitdir, "%s/.git", path);
1645         sub_git_dir = resolve_gitdir_gently(gitdir.buf, &err_code);
1646
1647         /* Not populated? */
1648         if (!sub_git_dir) {
1649                 const struct submodule *sub;
1650
1651                 if (err_code == READ_GITFILE_ERR_STAT_FAILED) {
1652                         /* unpopulated as expected */
1653                         strbuf_release(&gitdir);
1654                         return;
1655                 }
1656
1657                 if (err_code != READ_GITFILE_ERR_NOT_A_REPO)
1658                         /* We don't know what broke here. */
1659                         read_gitfile_error_die(err_code, path, NULL);
1660
1661                 /*
1662                 * Maybe populated, but no git directory was found?
1663                 * This can happen if the superproject is a submodule
1664                 * itself and was just absorbed. The absorption of the
1665                 * superproject did not rewrite the git file links yet,
1666                 * fix it now.
1667                 */
1668                 sub = submodule_from_path(null_sha1, path);
1669                 if (!sub)
1670                         die(_("could not lookup name for submodule '%s'"), path);
1671                 connect_work_tree_and_git_dir(path,
1672                         git_path("modules/%s", sub->name));
1673         } else {
1674                 /* Is it already absorbed into the superprojects git dir? */
1675                 char *real_sub_git_dir = real_pathdup(sub_git_dir, 1);
1676                 char *real_common_git_dir = real_pathdup(get_git_common_dir(), 1);
1677
1678                 if (!starts_with(real_sub_git_dir, real_common_git_dir))
1679                         relocate_single_git_dir_into_superproject(prefix, path);
1680
1681                 free(real_sub_git_dir);
1682                 free(real_common_git_dir);
1683         }
1684         strbuf_release(&gitdir);
1685
1686         if (flags & ABSORB_GITDIR_RECURSE_SUBMODULES) {
1687                 struct child_process cp = CHILD_PROCESS_INIT;
1688                 struct strbuf sb = STRBUF_INIT;
1689
1690                 if (flags & ~ABSORB_GITDIR_RECURSE_SUBMODULES)
1691                         die("BUG: we don't know how to pass the flags down?");
1692
1693                 strbuf_addstr(&sb, get_super_prefix_or_empty());
1694                 strbuf_addstr(&sb, path);
1695                 strbuf_addch(&sb, '/');
1696
1697                 cp.dir = path;
1698                 cp.git_cmd = 1;
1699                 cp.no_stdin = 1;
1700                 argv_array_pushl(&cp.args, "--super-prefix", sb.buf,
1701                                            "submodule--helper",
1702                                            "absorb-git-dirs", NULL);
1703                 prepare_submodule_repo_env(&cp.env_array);
1704                 if (run_command(&cp))
1705                         die(_("could not recurse into submodule '%s'"), path);
1706
1707                 strbuf_release(&sb);
1708         }
1709 }
1710
1711 const char *get_superproject_working_tree(void)
1712 {
1713         struct child_process cp = CHILD_PROCESS_INIT;
1714         struct strbuf sb = STRBUF_INIT;
1715         const char *one_up = real_path_if_valid("../");
1716         const char *cwd = xgetcwd();
1717         const char *ret = NULL;
1718         const char *subpath;
1719         int code;
1720         ssize_t len;
1721
1722         if (!is_inside_work_tree())
1723                 /*
1724                  * FIXME:
1725                  * We might have a superproject, but it is harder
1726                  * to determine.
1727                  */
1728                 return NULL;
1729
1730         if (!one_up)
1731                 return NULL;
1732
1733         subpath = relative_path(cwd, one_up, &sb);
1734
1735         prepare_submodule_repo_env(&cp.env_array);
1736         argv_array_pop(&cp.env_array);
1737
1738         argv_array_pushl(&cp.args, "--literal-pathspecs", "-C", "..",
1739                         "ls-files", "-z", "--stage", "--full-name", "--",
1740                         subpath, NULL);
1741         strbuf_reset(&sb);
1742
1743         cp.no_stdin = 1;
1744         cp.no_stderr = 1;
1745         cp.out = -1;
1746         cp.git_cmd = 1;
1747
1748         if (start_command(&cp))
1749                 die(_("could not start ls-files in .."));
1750
1751         len = strbuf_read(&sb, cp.out, PATH_MAX);
1752         close(cp.out);
1753
1754         if (starts_with(sb.buf, "160000")) {
1755                 int super_sub_len;
1756                 int cwd_len = strlen(cwd);
1757                 char *super_sub, *super_wt;
1758
1759                 /*
1760                  * There is a superproject having this repo as a submodule.
1761                  * The format is <mode> SP <hash> SP <stage> TAB <full name> \0,
1762                  * We're only interested in the name after the tab.
1763                  */
1764                 super_sub = strchr(sb.buf, '\t') + 1;
1765                 super_sub_len = sb.buf + sb.len - super_sub - 1;
1766
1767                 if (super_sub_len > cwd_len ||
1768                     strcmp(&cwd[cwd_len - super_sub_len], super_sub))
1769                         die (_("BUG: returned path string doesn't match cwd?"));
1770
1771                 super_wt = xstrdup(cwd);
1772                 super_wt[cwd_len - super_sub_len] = '\0';
1773
1774                 ret = real_path(super_wt);
1775                 free(super_wt);
1776         }
1777         strbuf_release(&sb);
1778
1779         code = finish_command(&cp);
1780
1781         if (code == 128)
1782                 /* '../' is not a git repository */
1783                 return NULL;
1784         if (code == 0 && len == 0)
1785                 /* There is an unrelated git repository at '../' */
1786                 return NULL;
1787         if (code)
1788                 die(_("ls-tree returned unexpected return code %d"), code);
1789
1790         return ret;
1791 }