git.oblomov.eu Git - git/blob - builtin/submodule--helper.c

   1 #define USE_THE_INDEX_COMPATIBILITY_MACROS
   2 #include "builtin.h"
   3 #include "repository.h"
   4 #include "cache.h"
   5 #include "config.h"
   6 #include "parse-options.h"
   7 #include "quote.h"
   8 #include "pathspec.h"
   9 #include "dir.h"
  10 #include "submodule.h"
  11 #include "submodule-config.h"
  12 #include "string-list.h"
  13 #include "run-command.h"
  14 #include "remote.h"
  15 #include "refs.h"
  16 #include "refspec.h"
  17 #include "connect.h"
  18 #include "revision.h"
  19 #include "diffcore.h"
  20 #include "diff.h"
  21 #include "object-store.h"
  22 #include "dir.h"
  23 #include "advice.h"
  24
  25 #define OPT_QUIET (1 << 0)
  26 #define OPT_CACHED (1 << 1)
  27 #define OPT_RECURSIVE (1 << 2)
  28 #define OPT_FORCE (1 << 3)
  29
  30 typedef void (*each_submodule_fn)(const struct cache_entry *list_item,
  31                                   void *cb_data);
  32
  33 static char *get_default_remote(void)
  34 {
  35         char *dest = NULL, *ret;
  36         struct strbuf sb = STRBUF_INIT;
  37         const char *refname = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
  38
  39         if (!refname)
  40                 die(_("No such ref: %s"), "HEAD");
  41
  42         /* detached HEAD */
  43         if (!strcmp(refname, "HEAD"))
  44                 return xstrdup("origin");
  45
  46         if (!skip_prefix(refname, "refs/heads/", &refname))
  47                 die(_("Expecting a full ref name, got %s"), refname);
  48
  49         strbuf_addf(&sb, "branch.%s.remote", refname);
  50         if (git_config_get_string(sb.buf, &dest))
  51                 ret = xstrdup("origin");
  52         else
  53                 ret = dest;
  54
  55         strbuf_release(&sb);
  56         return ret;
  57 }
  58
  59 static int print_default_remote(int argc, const char **argv, const char *prefix)
  60 {
  61         char *remote;
  62
  63         if (argc != 1)
  64                 die(_("submodule--helper print-default-remote takes no arguments"));
  65
  66         remote = get_default_remote();
  67         if (remote)
  68                 printf("%s\n", remote);
  69
  70         free(remote);
  71         return 0;
  72 }
  73
  74 static int starts_with_dot_slash(const char *str)
  75 {
  76         return str[0] == '.' && is_dir_sep(str[1]);
  77 }
  78
  79 static int starts_with_dot_dot_slash(const char *str)
  80 {
  81         return str[0] == '.' && str[1] == '.' && is_dir_sep(str[2]);
  82 }
  83
  84 /*
  85  * Returns 1 if it was the last chop before ':'.
  86  */
  87 static int chop_last_dir(char **remoteurl, int is_relative)
  88 {
  89         char *rfind = find_last_dir_sep(*remoteurl);
  90         if (rfind) {
  91                 *rfind = '\0';
  92                 return 0;
  93         }
  94
  95         rfind = strrchr(*remoteurl, ':');
  96         if (rfind) {
  97                 *rfind = '\0';
  98                 return 1;
  99         }
 100
 101         if (is_relative || !strcmp(".", *remoteurl))
 102                 die(_("cannot strip one component off url '%s'"),
 103                         *remoteurl);
 104
 105         free(*remoteurl);
 106         *remoteurl = xstrdup(".");
 107         return 0;
 108 }
 109
 110 /*
 111  * The `url` argument is the URL that navigates to the submodule origin
 112  * repo. When relative, this URL is relative to the superproject origin
 113  * URL repo. The `up_path` argument, if specified, is the relative
 114  * path that navigates from the submodule working tree to the superproject
 115  * working tree. Returns the origin URL of the submodule.
 116  *
 117  * Return either an absolute URL or filesystem path (if the superproject
 118  * origin URL is an absolute URL or filesystem path, respectively) or a
 119  * relative file system path (if the superproject origin URL is a relative
 120  * file system path).
 121  *
 122  * When the output is a relative file system path, the path is either
 123  * relative to the submodule working tree, if up_path is specified, or to
 124  * the superproject working tree otherwise.
 125  *
 126  * NEEDSWORK: This works incorrectly on the domain and protocol part.
 127  * remote_url      url              outcome          expectation
 128  * http://a.com/b  ../c             http://a.com/c   as is
 129  * http://a.com/b/ ../c             http://a.com/c   same as previous line, but
 130  *                                                   ignore trailing slash in url
 131  * http://a.com/b  ../../c          http://c         error out
 132  * http://a.com/b  ../../../c       http:/c          error out
 133  * http://a.com/b  ../../../../c    http:c           error out
 134  * http://a.com/b  ../../../../../c    .:c           error out
 135  * NEEDSWORK: Given how chop_last_dir() works, this function is broken
 136  * when a local part has a colon in its path component, too.
 137  */
 138 static char *relative_url(const char *remote_url,
 139                                 const char *url,
 140                                 const char *up_path)
 141 {
 142         int is_relative = 0;
 143         int colonsep = 0;
 144         char *out;
 145         char *remoteurl = xstrdup(remote_url);
 146         struct strbuf sb = STRBUF_INIT;
 147         size_t len = strlen(remoteurl);
 148
 149         if (is_dir_sep(remoteurl[len-1]))
 150                 remoteurl[len-1] = '\0';
 151
 152         if (!url_is_local_not_ssh(remoteurl) || is_absolute_path(remoteurl))
 153                 is_relative = 0;
 154         else {
 155                 is_relative = 1;
 156                 /*
 157                  * Prepend a './' to ensure all relative
 158                  * remoteurls start with './' or '../'
 159                  */
 160                 if (!starts_with_dot_slash(remoteurl) &&
 161                     !starts_with_dot_dot_slash(remoteurl)) {
 162                         strbuf_reset(&sb);
 163                         strbuf_addf(&sb, "./%s", remoteurl);
 164                         free(remoteurl);
 165                         remoteurl = strbuf_detach(&sb, NULL);
 166                 }
 167         }
 168         /*
 169          * When the url starts with '../', remove that and the
 170          * last directory in remoteurl.
 171          */
 172         while (url) {
 173                 if (starts_with_dot_dot_slash(url)) {
 174                         url += 3;
 175                         colonsep |= chop_last_dir(&remoteurl, is_relative);
 176                 } else if (starts_with_dot_slash(url))
 177                         url += 2;
 178                 else
 179                         break;
 180         }
 181         strbuf_reset(&sb);
 182         strbuf_addf(&sb, "%s%s%s", remoteurl, colonsep ? ":" : "/", url);
 183         if (ends_with(url, "/"))
 184                 strbuf_setlen(&sb, sb.len - 1);
 185         free(remoteurl);
 186
 187         if (starts_with_dot_slash(sb.buf))
 188                 out = xstrdup(sb.buf + 2);
 189         else
 190                 out = xstrdup(sb.buf);
 191         strbuf_reset(&sb);
 192
 193         if (!up_path || !is_relative)
 194                 return out;
 195
 196         strbuf_addf(&sb, "%s%s", up_path, out);
 197         free(out);
 198         return strbuf_detach(&sb, NULL);
 199 }
 200
 201 static int resolve_relative_url(int argc, const char **argv, const char *prefix)
 202 {
 203         char *remoteurl = NULL;
 204         char *remote = get_default_remote();
 205         const char *up_path = NULL;
 206         char *res;
 207         const char *url;
 208         struct strbuf sb = STRBUF_INIT;
 209
 210         if (argc != 2 && argc != 3)
 211                 die("resolve-relative-url only accepts one or two arguments");
 212
 213         url = argv[1];
 214         strbuf_addf(&sb, "remote.%s.url", remote);
 215         free(remote);
 216
 217         if (git_config_get_string(sb.buf, &remoteurl))
 218                 /* the repository is its own authoritative upstream */
 219                 remoteurl = xgetcwd();
 220
 221         if (argc == 3)
 222                 up_path = argv[2];
 223
 224         res = relative_url(remoteurl, url, up_path);
 225         puts(res);
 226         free(res);
 227         free(remoteurl);
 228         return 0;
 229 }
 230
 231 static int resolve_relative_url_test(int argc, const char **argv, const char *prefix)
 232 {
 233         char *remoteurl, *res;
 234         const char *up_path, *url;
 235
 236         if (argc != 4)
 237                 die("resolve-relative-url-test only accepts three arguments: <up_path> <remoteurl> <url>");
 238
 239         up_path = argv[1];
 240         remoteurl = xstrdup(argv[2]);
 241         url = argv[3];
 242
 243         if (!strcmp(up_path, "(null)"))
 244                 up_path = NULL;
 245
 246         res = relative_url(remoteurl, url, up_path);
 247         puts(res);
 248         free(res);
 249         free(remoteurl);
 250         return 0;
 251 }
 252
 253 /* the result should be freed by the caller. */
 254 static char *get_submodule_displaypath(const char *path, const char *prefix)
 255 {
 256         const char *super_prefix = get_super_prefix();
 257
 258         if (prefix && super_prefix) {
 259                 BUG("cannot have prefix '%s' and superprefix '%s'",
 260                     prefix, super_prefix);
 261         } else if (prefix) {
 262                 struct strbuf sb = STRBUF_INIT;
 263                 char *displaypath = xstrdup(relative_path(path, prefix, &sb));
 264                 strbuf_release(&sb);
 265                 return displaypath;
 266         } else if (super_prefix) {
 267                 return xstrfmt("%s%s", super_prefix, path);
 268         } else {
 269                 return xstrdup(path);
 270         }
 271 }
 272
 273 static char *compute_rev_name(const char *sub_path, const char* object_id)
 274 {
 275         struct strbuf sb = STRBUF_INIT;
 276         const char ***d;
 277
 278         static const char *describe_bare[] = { NULL };
 279
 280         static const char *describe_tags[] = { "--tags", NULL };
 281
 282         static const char *describe_contains[] = { "--contains", NULL };
 283
 284         static const char *describe_all_always[] = { "--all", "--always", NULL };
 285
 286         static const char **describe_argv[] = { describe_bare, describe_tags,
 287                                                 describe_contains,
 288                                                 describe_all_always, NULL };
 289
 290         for (d = describe_argv; *d; d++) {
 291                 struct child_process cp = CHILD_PROCESS_INIT;
 292                 prepare_submodule_repo_env(&cp.env_array);
 293                 cp.dir = sub_path;
 294                 cp.git_cmd = 1;
 295                 cp.no_stderr = 1;
 296
 297                 strvec_push(&cp.args, "describe");
 298                 strvec_pushv(&cp.args, *d);
 299                 strvec_push(&cp.args, object_id);
 300
 301                 if (!capture_command(&cp, &sb, 0)) {
 302                         strbuf_strip_suffix(&sb, "\n");
 303                         return strbuf_detach(&sb, NULL);
 304                 }
 305         }
 306
 307         strbuf_release(&sb);
 308         return NULL;
 309 }
 310
 311 struct module_list {
 312         const struct cache_entry **entries;
 313         int alloc, nr;
 314 };
 315 #define MODULE_LIST_INIT { NULL, 0, 0 }
 316
 317 static int module_list_compute(int argc, const char **argv,
 318                                const char *prefix,
 319                                struct pathspec *pathspec,
 320                                struct module_list *list)
 321 {
 322         int i, result = 0;
 323         char *ps_matched = NULL;
 324         parse_pathspec(pathspec, 0,
 325                        PATHSPEC_PREFER_FULL,
 326                        prefix, argv);
 327
 328         if (pathspec->nr)
 329                 ps_matched = xcalloc(pathspec->nr, 1);
 330
 331         if (read_cache() < 0)
 332                 die(_("index file corrupt"));
 333
 334         for (i = 0; i < active_nr; i++) {
 335                 const struct cache_entry *ce = active_cache[i];
 336
 337                 if (!match_pathspec(&the_index, pathspec, ce->name, ce_namelen(ce),
 338                                     0, ps_matched, 1) ||
 339                     !S_ISGITLINK(ce->ce_mode))
 340                         continue;
 341
 342                 ALLOC_GROW(list->entries, list->nr + 1, list->alloc);
 343                 list->entries[list->nr++] = ce;
 344                 while (i + 1 < active_nr &&
 345                        !strcmp(ce->name, active_cache[i + 1]->name))
 346                         /*
 347                          * Skip entries with the same name in different stages
 348                          * to make sure an entry is returned only once.
 349                          */
 350                         i++;
 351         }
 352
 353         if (ps_matched && report_path_error(ps_matched, pathspec))
 354                 result = -1;
 355
 356         free(ps_matched);
 357
 358         return result;
 359 }
 360
 361 static void module_list_active(struct module_list *list)
 362 {
 363         int i;
 364         struct module_list active_modules = MODULE_LIST_INIT;
 365
 366         for (i = 0; i < list->nr; i++) {
 367                 const struct cache_entry *ce = list->entries[i];
 368
 369                 if (!is_submodule_active(the_repository, ce->name))
 370                         continue;
 371
 372                 ALLOC_GROW(active_modules.entries,
 373                            active_modules.nr + 1,
 374                            active_modules.alloc);
 375                 active_modules.entries[active_modules.nr++] = ce;
 376         }
 377
 378         free(list->entries);
 379         *list = active_modules;
 380 }
 381
 382 static char *get_up_path(const char *path)
 383 {
 384         int i;
 385         struct strbuf sb = STRBUF_INIT;
 386
 387         for (i = count_slashes(path); i; i--)
 388                 strbuf_addstr(&sb, "../");
 389
 390         /*
 391          * Check if 'path' ends with slash or not
 392          * for having the same output for dir/sub_dir
 393          * and dir/sub_dir/
 394          */
 395         if (!is_dir_sep(path[strlen(path) - 1]))
 396                 strbuf_addstr(&sb, "../");
 397
 398         return strbuf_detach(&sb, NULL);
 399 }
 400
 401 static int module_list(int argc, const char **argv, const char *prefix)
 402 {
 403         int i;
 404         struct pathspec pathspec;
 405         struct module_list list = MODULE_LIST_INIT;
 406
 407         struct option module_list_options[] = {
 408                 OPT_STRING(0, "prefix", &prefix,
 409                            N_("path"),
 410                            N_("alternative anchor for relative paths")),
 411                 OPT_END()
 412         };
 413
 414         const char *const git_submodule_helper_usage[] = {
 415                 N_("git submodule--helper list [--prefix=<path>] [<path>...]"),
 416                 NULL
 417         };
 418
 419         argc = parse_options(argc, argv, prefix, module_list_options,
 420                              git_submodule_helper_usage, 0);
 421
 422         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 423                 return 1;
 424
 425         for (i = 0; i < list.nr; i++) {
 426                 const struct cache_entry *ce = list.entries[i];
 427
 428                 if (ce_stage(ce))
 429                         printf("%06o %s U\t", ce->ce_mode, oid_to_hex(&null_oid));
 430                 else
 431                         printf("%06o %s %d\t", ce->ce_mode,
 432                                oid_to_hex(&ce->oid), ce_stage(ce));
 433
 434                 fprintf(stdout, "%s\n", ce->name);
 435         }
 436         return 0;
 437 }
 438
 439 static void for_each_listed_submodule(const struct module_list *list,
 440                                       each_submodule_fn fn, void *cb_data)
 441 {
 442         int i;
 443         for (i = 0; i < list->nr; i++)
 444                 fn(list->entries[i], cb_data);
 445 }
 446
 447 struct foreach_cb {
 448         int argc;
 449         const char **argv;
 450         const char *prefix;
 451         int quiet;
 452         int recursive;
 453 };
 454 #define FOREACH_CB_INIT { 0 }
 455
 456 static void runcommand_in_submodule_cb(const struct cache_entry *list_item,
 457                                        void *cb_data)
 458 {
 459         struct foreach_cb *info = cb_data;
 460         const char *path = list_item->name;
 461         const struct object_id *ce_oid = &list_item->oid;
 462
 463         const struct submodule *sub;
 464         struct child_process cp = CHILD_PROCESS_INIT;
 465         char *displaypath;
 466
 467         displaypath = get_submodule_displaypath(path, info->prefix);
 468
 469         sub = submodule_from_path(the_repository, &null_oid, path);
 470
 471         if (!sub)
 472                 die(_("No url found for submodule path '%s' in .gitmodules"),
 473                         displaypath);
 474
 475         if (!is_submodule_populated_gently(path, NULL))
 476                 goto cleanup;
 477
 478         prepare_submodule_repo_env(&cp.env_array);
 479
 480         /*
 481          * For the purpose of executing <command> in the submodule,
 482          * separate shell is used for the purpose of running the
 483          * child process.
 484          */
 485         cp.use_shell = 1;
 486         cp.dir = path;
 487
 488         /*
 489          * NEEDSWORK: the command currently has access to the variables $name,
 490          * $sm_path, $displaypath, $sha1 and $toplevel only when the command
 491          * contains a single argument. This is done for maintaining a faithful
 492          * translation from shell script.
 493          */
 494         if (info->argc == 1) {
 495                 char *toplevel = xgetcwd();
 496                 struct strbuf sb = STRBUF_INIT;
 497
 498                 strvec_pushf(&cp.env_array, "name=%s", sub->name);
 499                 strvec_pushf(&cp.env_array, "sm_path=%s", path);
 500                 strvec_pushf(&cp.env_array, "displaypath=%s", displaypath);
 501                 strvec_pushf(&cp.env_array, "sha1=%s",
 502                              oid_to_hex(ce_oid));
 503                 strvec_pushf(&cp.env_array, "toplevel=%s", toplevel);
 504
 505                 /*
 506                  * Since the path variable was accessible from the script
 507                  * before porting, it is also made available after porting.
 508                  * The environment variable "PATH" has a very special purpose
 509                  * on windows. And since environment variables are
 510                  * case-insensitive in windows, it interferes with the
 511                  * existing PATH variable. Hence, to avoid that, we expose
 512                  * path via the args strvec and not via env_array.
 513                  */
 514                 sq_quote_buf(&sb, path);
 515                 strvec_pushf(&cp.args, "path=%s; %s",
 516                              sb.buf, info->argv[0]);
 517                 strbuf_release(&sb);
 518                 free(toplevel);
 519         } else {
 520                 strvec_pushv(&cp.args, info->argv);
 521         }
 522
 523         if (!info->quiet)
 524                 printf(_("Entering '%s'\n"), displaypath);
 525
 526         if (info->argv[0] && run_command(&cp))
 527                 die(_("run_command returned non-zero status for %s\n."),
 528                         displaypath);
 529
 530         if (info->recursive) {
 531                 struct child_process cpr = CHILD_PROCESS_INIT;
 532
 533                 cpr.git_cmd = 1;
 534                 cpr.dir = path;
 535                 prepare_submodule_repo_env(&cpr.env_array);
 536
 537                 strvec_pushl(&cpr.args, "--super-prefix", NULL);
 538                 strvec_pushf(&cpr.args, "%s/", displaypath);
 539                 strvec_pushl(&cpr.args, "submodule--helper", "foreach", "--recursive",
 540                              NULL);
 541
 542                 if (info->quiet)
 543                         strvec_push(&cpr.args, "--quiet");
 544
 545                 strvec_push(&cpr.args, "--");
 546                 strvec_pushv(&cpr.args, info->argv);
 547
 548                 if (run_command(&cpr))
 549                         die(_("run_command returned non-zero status while "
 550                                 "recursing in the nested submodules of %s\n."),
 551                                 displaypath);
 552         }
 553
 554 cleanup:
 555         free(displaypath);
 556 }
 557
 558 static int module_foreach(int argc, const char **argv, const char *prefix)
 559 {
 560         struct foreach_cb info = FOREACH_CB_INIT;
 561         struct pathspec pathspec;
 562         struct module_list list = MODULE_LIST_INIT;
 563
 564         struct option module_foreach_options[] = {
 565                 OPT__QUIET(&info.quiet, N_("suppress output of entering each submodule command")),
 566                 OPT_BOOL(0, "recursive", &info.recursive,
 567                          N_("recurse into nested submodules")),
 568                 OPT_END()
 569         };
 570
 571         const char *const git_submodule_helper_usage[] = {
 572                 N_("git submodule--helper foreach [--quiet] [--recursive] [--] <command>"),
 573                 NULL
 574         };
 575
 576         argc = parse_options(argc, argv, prefix, module_foreach_options,
 577                              git_submodule_helper_usage, 0);
 578
 579         if (module_list_compute(0, NULL, prefix, &pathspec, &list) < 0)
 580                 return 1;
 581
 582         info.argc = argc;
 583         info.argv = argv;
 584         info.prefix = prefix;
 585
 586         for_each_listed_submodule(&list, runcommand_in_submodule_cb, &info);
 587
 588         return 0;
 589 }
 590
 591 static char *compute_submodule_clone_url(const char *rel_url)
 592 {
 593         char *remoteurl, *relurl;
 594         char *remote = get_default_remote();
 595         struct strbuf remotesb = STRBUF_INIT;
 596
 597         strbuf_addf(&remotesb, "remote.%s.url", remote);
 598         if (git_config_get_string(remotesb.buf, &remoteurl)) {
 599                 warning(_("could not look up configuration '%s'. Assuming this repository is its own authoritative upstream."), remotesb.buf);
 600                 remoteurl = xgetcwd();
 601         }
 602         relurl = relative_url(remoteurl, rel_url, NULL);
 603
 604         free(remote);
 605         free(remoteurl);
 606         strbuf_release(&remotesb);
 607
 608         return relurl;
 609 }
 610
 611 struct init_cb {
 612         const char *prefix;
 613         unsigned int flags;
 614 };
 615 #define INIT_CB_INIT { NULL, 0 }
 616
 617 static void init_submodule(const char *path, const char *prefix,
 618                            unsigned int flags)
 619 {
 620         const struct submodule *sub;
 621         struct strbuf sb = STRBUF_INIT;
 622         char *upd = NULL, *url = NULL, *displaypath;
 623
 624         displaypath = get_submodule_displaypath(path, prefix);
 625
 626         sub = submodule_from_path(the_repository, &null_oid, path);
 627
 628         if (!sub)
 629                 die(_("No url found for submodule path '%s' in .gitmodules"),
 630                         displaypath);
 631
 632         /*
 633          * NEEDSWORK: In a multi-working-tree world, this needs to be
 634          * set in the per-worktree config.
 635          *
 636          * Set active flag for the submodule being initialized
 637          */
 638         if (!is_submodule_active(the_repository, path)) {
 639                 strbuf_addf(&sb, "submodule.%s.active", sub->name);
 640                 git_config_set_gently(sb.buf, "true");
 641                 strbuf_reset(&sb);
 642         }
 643
 644         /*
 645          * Copy url setting when it is not set yet.
 646          * To look up the url in .git/config, we must not fall back to
 647          * .gitmodules, so look it up directly.
 648          */
 649         strbuf_addf(&sb, "submodule.%s.url", sub->name);
 650         if (git_config_get_string(sb.buf, &url)) {
 651                 if (!sub->url)
 652                         die(_("No url found for submodule path '%s' in .gitmodules"),
 653                                 displaypath);
 654
 655                 url = xstrdup(sub->url);
 656
 657                 /* Possibly a url relative to parent */
 658                 if (starts_with_dot_dot_slash(url) ||
 659                     starts_with_dot_slash(url)) {
 660                         char *oldurl = url;
 661                         url = compute_submodule_clone_url(oldurl);
 662                         free(oldurl);
 663                 }
 664
 665                 if (git_config_set_gently(sb.buf, url))
 666                         die(_("Failed to register url for submodule path '%s'"),
 667                             displaypath);
 668                 if (!(flags & OPT_QUIET))
 669                         fprintf(stderr,
 670                                 _("Submodule '%s' (%s) registered for path '%s'\n"),
 671                                 sub->name, url, displaypath);
 672         }
 673         strbuf_reset(&sb);
 674
 675         /* Copy "update" setting when it is not set yet */
 676         strbuf_addf(&sb, "submodule.%s.update", sub->name);
 677         if (git_config_get_string(sb.buf, &upd) &&
 678             sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
 679                 if (sub->update_strategy.type == SM_UPDATE_COMMAND) {
 680                         fprintf(stderr, _("warning: command update mode suggested for submodule '%s'\n"),
 681                                 sub->name);
 682                         upd = xstrdup("none");
 683                 } else
 684                         upd = xstrdup(submodule_strategy_to_string(&sub->update_strategy));
 685
 686                 if (git_config_set_gently(sb.buf, upd))
 687                         die(_("Failed to register update mode for submodule path '%s'"), displaypath);
 688         }
 689         strbuf_release(&sb);
 690         free(displaypath);
 691         free(url);
 692         free(upd);
 693 }
 694
 695 static void init_submodule_cb(const struct cache_entry *list_item, void *cb_data)
 696 {
 697         struct init_cb *info = cb_data;
 698         init_submodule(list_item->name, info->prefix, info->flags);
 699 }
 700
 701 static int module_init(int argc, const char **argv, const char *prefix)
 702 {
 703         struct init_cb info = INIT_CB_INIT;
 704         struct pathspec pathspec;
 705         struct module_list list = MODULE_LIST_INIT;
 706         int quiet = 0;
 707
 708         struct option module_init_options[] = {
 709                 OPT__QUIET(&quiet, N_("suppress output for initializing a submodule")),
 710                 OPT_END()
 711         };
 712
 713         const char *const git_submodule_helper_usage[] = {
 714                 N_("git submodule--helper init [<options>] [<path>]"),
 715                 NULL
 716         };
 717
 718         argc = parse_options(argc, argv, prefix, module_init_options,
 719                              git_submodule_helper_usage, 0);
 720
 721         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 722                 return 1;
 723
 724         /*
 725          * If there are no path args and submodule.active is set then,
 726          * by default, only initialize 'active' modules.
 727          */
 728         if (!argc && git_config_get_value_multi("submodule.active"))
 729                 module_list_active(&list);
 730
 731         info.prefix = prefix;
 732         if (quiet)
 733                 info.flags |= OPT_QUIET;
 734
 735         for_each_listed_submodule(&list, init_submodule_cb, &info);
 736
 737         return 0;
 738 }
 739
 740 struct status_cb {
 741         const char *prefix;
 742         unsigned int flags;
 743 };
 744 #define STATUS_CB_INIT { NULL, 0 }
 745
 746 static void print_status(unsigned int flags, char state, const char *path,
 747                          const struct object_id *oid, const char *displaypath)
 748 {
 749         if (flags & OPT_QUIET)
 750                 return;
 751
 752         printf("%c%s %s", state, oid_to_hex(oid), displaypath);
 753
 754         if (state == ' ' || state == '+') {
 755                 const char *name = compute_rev_name(path, oid_to_hex(oid));
 756
 757                 if (name)
 758                         printf(" (%s)", name);
 759         }
 760
 761         printf("\n");
 762 }
 763
 764 static int handle_submodule_head_ref(const char *refname,
 765                                      const struct object_id *oid, int flags,
 766                                      void *cb_data)
 767 {
 768         struct object_id *output = cb_data;
 769         if (oid)
 770                 oidcpy(output, oid);
 771
 772         return 0;
 773 }
 774
 775 static void status_submodule(const char *path, const struct object_id *ce_oid,
 776                              unsigned int ce_flags, const char *prefix,
 777                              unsigned int flags)
 778 {
 779         char *displaypath;
 780         struct strvec diff_files_args = STRVEC_INIT;
 781         struct rev_info rev;
 782         int diff_files_result;
 783         struct strbuf buf = STRBUF_INIT;
 784         const char *git_dir;
 785
 786         if (!submodule_from_path(the_repository, &null_oid, path))
 787                 die(_("no submodule mapping found in .gitmodules for path '%s'"),
 788                       path);
 789
 790         displaypath = get_submodule_displaypath(path, prefix);
 791
 792         if ((CE_STAGEMASK & ce_flags) >> CE_STAGESHIFT) {
 793                 print_status(flags, 'U', path, &null_oid, displaypath);
 794                 goto cleanup;
 795         }
 796
 797         strbuf_addf(&buf, "%s/.git", path);
 798         git_dir = read_gitfile(buf.buf);
 799         if (!git_dir)
 800                 git_dir = buf.buf;
 801
 802         if (!is_submodule_active(the_repository, path) ||
 803             !is_git_directory(git_dir)) {
 804                 print_status(flags, '-', path, ce_oid, displaypath);
 805                 strbuf_release(&buf);
 806                 goto cleanup;
 807         }
 808         strbuf_release(&buf);
 809
 810         strvec_pushl(&diff_files_args, "diff-files",
 811                      "--ignore-submodules=dirty", "--quiet", "--",
 812                      path, NULL);
 813
 814         git_config(git_diff_basic_config, NULL);
 815
 816         repo_init_revisions(the_repository, &rev, NULL);
 817         rev.abbrev = 0;
 818         diff_files_args.nr = setup_revisions(diff_files_args.nr,
 819                                              diff_files_args.v,
 820                                              &rev, NULL);
 821         diff_files_result = run_diff_files(&rev, 0);
 822
 823         if (!diff_result_code(&rev.diffopt, diff_files_result)) {
 824                 print_status(flags, ' ', path, ce_oid,
 825                              displaypath);
 826         } else if (!(flags & OPT_CACHED)) {
 827                 struct object_id oid;
 828                 struct ref_store *refs = get_submodule_ref_store(path);
 829
 830                 if (!refs) {
 831                         print_status(flags, '-', path, ce_oid, displaypath);
 832                         goto cleanup;
 833                 }
 834                 if (refs_head_ref(refs, handle_submodule_head_ref, &oid))
 835                         die(_("could not resolve HEAD ref inside the "
 836                               "submodule '%s'"), path);
 837
 838                 print_status(flags, '+', path, &oid, displaypath);
 839         } else {
 840                 print_status(flags, '+', path, ce_oid, displaypath);
 841         }
 842
 843         if (flags & OPT_RECURSIVE) {
 844                 struct child_process cpr = CHILD_PROCESS_INIT;
 845
 846                 cpr.git_cmd = 1;
 847                 cpr.dir = path;
 848                 prepare_submodule_repo_env(&cpr.env_array);
 849
 850                 strvec_push(&cpr.args, "--super-prefix");
 851                 strvec_pushf(&cpr.args, "%s/", displaypath);
 852                 strvec_pushl(&cpr.args, "submodule--helper", "status",
 853                              "--recursive", NULL);
 854
 855                 if (flags & OPT_CACHED)
 856                         strvec_push(&cpr.args, "--cached");
 857
 858                 if (flags & OPT_QUIET)
 859                         strvec_push(&cpr.args, "--quiet");
 860
 861                 if (run_command(&cpr))
 862                         die(_("failed to recurse into submodule '%s'"), path);
 863         }
 864
 865 cleanup:
 866         strvec_clear(&diff_files_args);
 867         free(displaypath);
 868 }
 869
 870 static void status_submodule_cb(const struct cache_entry *list_item,
 871                                 void *cb_data)
 872 {
 873         struct status_cb *info = cb_data;
 874         status_submodule(list_item->name, &list_item->oid, list_item->ce_flags,
 875                          info->prefix, info->flags);
 876 }
 877
 878 static int module_status(int argc, const char **argv, const char *prefix)
 879 {
 880         struct status_cb info = STATUS_CB_INIT;
 881         struct pathspec pathspec;
 882         struct module_list list = MODULE_LIST_INIT;
 883         int quiet = 0;
 884
 885         struct option module_status_options[] = {
 886                 OPT__QUIET(&quiet, N_("suppress submodule status output")),
 887                 OPT_BIT(0, "cached", &info.flags, N_("use commit stored in the index instead of the one stored in the submodule HEAD"), OPT_CACHED),
 888                 OPT_BIT(0, "recursive", &info.flags, N_("recurse into nested submodules"), OPT_RECURSIVE),
 889                 OPT_END()
 890         };
 891
 892         const char *const git_submodule_helper_usage[] = {
 893                 N_("git submodule status [--quiet] [--cached] [--recursive] [<path>...]"),
 894                 NULL
 895         };
 896
 897         argc = parse_options(argc, argv, prefix, module_status_options,
 898                              git_submodule_helper_usage, 0);
 899
 900         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 901                 return 1;
 902
 903         info.prefix = prefix;
 904         if (quiet)
 905                 info.flags |= OPT_QUIET;
 906
 907         for_each_listed_submodule(&list, status_submodule_cb, &info);
 908
 909         return 0;
 910 }
 911
 912 static int module_name(int argc, const char **argv, const char *prefix)
 913 {
 914         const struct submodule *sub;
 915
 916         if (argc != 2)
 917                 usage(_("git submodule--helper name <path>"));
 918
 919         sub = submodule_from_path(the_repository, &null_oid, argv[1]);
 920
 921         if (!sub)
 922                 die(_("no submodule mapping found in .gitmodules for path '%s'"),
 923                     argv[1]);
 924
 925         printf("%s\n", sub->name);
 926
 927         return 0;
 928 }
 929
 930 struct module_cb {
 931         unsigned int mod_src;
 932         unsigned int mod_dst;
 933         struct object_id oid_src;
 934         struct object_id oid_dst;
 935         char status;
 936         const char *sm_path;
 937 };
 938 #define MODULE_CB_INIT { 0, 0, NULL, NULL, '\0', NULL }
 939
 940 struct module_cb_list {
 941         struct module_cb **entries;
 942         int alloc, nr;
 943 };
 944 #define MODULE_CB_LIST_INIT { NULL, 0, 0 }
 945
 946 struct summary_cb {
 947         int argc;
 948         const char **argv;
 949         const char *prefix;
 950         unsigned int cached: 1;
 951         unsigned int for_status: 1;
 952         unsigned int files: 1;
 953         int summary_limit;
 954 };
 955 #define SUMMARY_CB_INIT { 0, NULL, NULL, 0, 0, 0, 0 }
 956
 957 enum diff_cmd {
 958         DIFF_INDEX,
 959         DIFF_FILES
 960 };
 961
 962 static char *verify_submodule_committish(const char *sm_path,
 963                                          const char *committish)
 964 {
 965         struct child_process cp_rev_parse = CHILD_PROCESS_INIT;
 966         struct strbuf result = STRBUF_INIT;
 967
 968         cp_rev_parse.git_cmd = 1;
 969         cp_rev_parse.dir = sm_path;
 970         prepare_submodule_repo_env(&cp_rev_parse.env_array);
 971         strvec_pushl(&cp_rev_parse.args, "rev-parse", "-q", "--short", NULL);
 972         strvec_pushf(&cp_rev_parse.args, "%s^0", committish);
 973         strvec_push(&cp_rev_parse.args, "--");
 974
 975         if (capture_command(&cp_rev_parse, &result, 0))
 976                 return NULL;
 977
 978         strbuf_trim_trailing_newline(&result);
 979         return strbuf_detach(&result, NULL);
 980 }
 981
 982 static void print_submodule_summary(struct summary_cb *info, char *errmsg,
 983                                     int total_commits, const char *displaypath,
 984                                     const char *src_abbrev, const char *dst_abbrev,
 985                                     struct module_cb *p)
 986 {
 987         if (p->status == 'T') {
 988                 if (S_ISGITLINK(p->mod_dst))
 989                         printf(_("* %s %s(blob)->%s(submodule)"),
 990                                  displaypath, src_abbrev, dst_abbrev);
 991                 else
 992                         printf(_("* %s %s(submodule)->%s(blob)"),
 993                                  displaypath, src_abbrev, dst_abbrev);
 994         } else {
 995                 printf("* %s %s...%s",
 996                         displaypath, src_abbrev, dst_abbrev);
 997         }
 998
 999         if (total_commits < 0)
1000                 printf(":\n");
1001         else
1002                 printf(" (%d):\n", total_commits);
1003
1004         if (errmsg) {
1005                 printf(_("%s"), errmsg);
1006         } else if (total_commits > 0) {
1007                 struct child_process cp_log = CHILD_PROCESS_INIT;
1008
1009                 cp_log.git_cmd = 1;
1010                 cp_log.dir = p->sm_path;
1011                 prepare_submodule_repo_env(&cp_log.env_array);
1012                 strvec_pushl(&cp_log.args, "log", NULL);
1013
1014                 if (S_ISGITLINK(p->mod_src) && S_ISGITLINK(p->mod_dst)) {
1015                         if (info->summary_limit > 0)
1016                                 strvec_pushf(&cp_log.args, "-%d",
1017                                              info->summary_limit);
1018
1019                         strvec_pushl(&cp_log.args, "--pretty=  %m %s",
1020                                      "--first-parent", NULL);
1021                         strvec_pushf(&cp_log.args, "%s...%s",
1022                                      src_abbrev, dst_abbrev);
1023                 } else if (S_ISGITLINK(p->mod_dst)) {
1024                         strvec_pushl(&cp_log.args, "--pretty=  > %s",
1025                                      "-1", dst_abbrev, NULL);
1026                 } else {
1027                         strvec_pushl(&cp_log.args, "--pretty=  < %s",
1028                                      "-1", src_abbrev, NULL);
1029                 }
1030                 run_command(&cp_log);
1031         }
1032         printf("\n");
1033 }
1034
1035 static void generate_submodule_summary(struct summary_cb *info,
1036                                        struct module_cb *p)
1037 {
1038         char *displaypath, *src_abbrev = NULL, *dst_abbrev;
1039         int missing_src = 0, missing_dst = 0;
1040         char *errmsg = NULL;
1041         int total_commits = -1;
1042
1043         if (!info->cached && oideq(&p->oid_dst, &null_oid)) {
1044                 if (S_ISGITLINK(p->mod_dst)) {
1045                         struct ref_store *refs = get_submodule_ref_store(p->sm_path);
1046                         if (refs)
1047                                 refs_head_ref(refs, handle_submodule_head_ref, &p->oid_dst);
1048                 } else if (S_ISLNK(p->mod_dst) || S_ISREG(p->mod_dst)) {
1049                         struct stat st;
1050                         int fd = open(p->sm_path, O_RDONLY);
1051
1052                         if (fd < 0 || fstat(fd, &st) < 0 ||
1053                             index_fd(&the_index, &p->oid_dst, fd, &st, OBJ_BLOB,
1054                                      p->sm_path, 0))
1055                                 error(_("couldn't hash object from '%s'"), p->sm_path);
1056                 } else {
1057                         /* for a submodule removal (mode:0000000), don't warn */
1058                         if (p->mod_dst)
1059                                 warning(_("unexpected mode %o\n"), p->mod_dst);
1060                 }
1061         }
1062
1063         if (S_ISGITLINK(p->mod_src)) {
1064                 if (p->status != 'D')
1065                         src_abbrev = verify_submodule_committish(p->sm_path,
1066                                                                  oid_to_hex(&p->oid_src));
1067                 if (!src_abbrev) {
1068                         missing_src = 1;
1069                         /*
1070                          * As `rev-parse` failed, we fallback to getting
1071                          * the abbreviated hash using oid_src. We do
1072                          * this as we might still need the abbreviated
1073                          * hash in cases like a submodule type change, etc.
1074                          */
1075                         src_abbrev = xstrndup(oid_to_hex(&p->oid_src), 7);
1076                 }
1077         } else {
1078                 /*
1079                  * The source does not point to a submodule.
1080                  * So, we fallback to getting the abbreviation using
1081                  * oid_src as we might still need the abbreviated
1082                  * hash in cases like submodule add, etc.
1083                  */
1084                 src_abbrev = xstrndup(oid_to_hex(&p->oid_src), 7);
1085         }
1086
1087         if (S_ISGITLINK(p->mod_dst)) {
1088                 dst_abbrev = verify_submodule_committish(p->sm_path,
1089                                                          oid_to_hex(&p->oid_dst));
1090                 if (!dst_abbrev) {
1091                         missing_dst = 1;
1092                         /*
1093                          * As `rev-parse` failed, we fallback to getting
1094                          * the abbreviated hash using oid_dst. We do
1095                          * this as we might still need the abbreviated
1096                          * hash in cases like a submodule type change, etc.
1097                          */
1098                         dst_abbrev = xstrndup(oid_to_hex(&p->oid_dst), 7);
1099                 }
1100         } else {
1101                 /*
1102                  * The destination does not point to a submodule.
1103                  * So, we fallback to getting the abbreviation using
1104                  * oid_dst as we might still need the abbreviated
1105                  * hash in cases like a submodule removal, etc.
1106                  */
1107                 dst_abbrev = xstrndup(oid_to_hex(&p->oid_dst), 7);
1108         }
1109
1110         displaypath = get_submodule_displaypath(p->sm_path, info->prefix);
1111
1112         if (!missing_src && !missing_dst) {
1113                 struct child_process cp_rev_list = CHILD_PROCESS_INIT;
1114                 struct strbuf sb_rev_list = STRBUF_INIT;
1115
1116                 strvec_pushl(&cp_rev_list.args, "rev-list",
1117                              "--first-parent", "--count", NULL);
1118                 if (S_ISGITLINK(p->mod_src) && S_ISGITLINK(p->mod_dst))
1119                         strvec_pushf(&cp_rev_list.args, "%s...%s",
1120                                      src_abbrev, dst_abbrev);
1121                 else
1122                         strvec_push(&cp_rev_list.args, S_ISGITLINK(p->mod_src) ?
1123                                     src_abbrev : dst_abbrev);
1124                 strvec_push(&cp_rev_list.args, "--");
1125
1126                 cp_rev_list.git_cmd = 1;
1127                 cp_rev_list.dir = p->sm_path;
1128                 prepare_submodule_repo_env(&cp_rev_list.env_array);
1129
1130                 if (!capture_command(&cp_rev_list, &sb_rev_list, 0))
1131                         total_commits = atoi(sb_rev_list.buf);
1132
1133                 strbuf_release(&sb_rev_list);
1134         } else {
1135                 /*
1136                  * Don't give error msg for modification whose dst is not
1137                  * submodule, i.e., deleted or changed to blob
1138                  */
1139                 if (S_ISGITLINK(p->mod_dst)) {
1140                         struct strbuf errmsg_str = STRBUF_INIT;
1141                         if (missing_src && missing_dst) {
1142                                 strbuf_addf(&errmsg_str, "  Warn: %s doesn't contain commits %s and %s\n",
1143                                             displaypath, oid_to_hex(&p->oid_src),
1144                                             oid_to_hex(&p->oid_dst));
1145                         } else {
1146                                 strbuf_addf(&errmsg_str, "  Warn: %s doesn't contain commit %s\n",
1147                                             displaypath, missing_src ?
1148                                             oid_to_hex(&p->oid_src) :
1149                                             oid_to_hex(&p->oid_dst));
1150                         }
1151                         errmsg = strbuf_detach(&errmsg_str, NULL);
1152                 }
1153         }
1154
1155         print_submodule_summary(info, errmsg, total_commits,
1156                                 displaypath, src_abbrev,
1157                                 dst_abbrev, p);
1158
1159         free(displaypath);
1160         free(src_abbrev);
1161         free(dst_abbrev);
1162 }
1163
1164 static void prepare_submodule_summary(struct summary_cb *info,
1165                                       struct module_cb_list *list)
1166 {
1167         int i;
1168         for (i = 0; i < list->nr; i++) {
1169                 const struct submodule *sub;
1170                 struct module_cb *p = list->entries[i];
1171                 struct strbuf sm_gitdir = STRBUF_INIT;
1172
1173                 if (p->status == 'D' || p->status == 'T') {
1174                         generate_submodule_summary(info, p);
1175                         continue;
1176                 }
1177
1178                 if (info->for_status && p->status != 'A' &&
1179                     (sub = submodule_from_path(the_repository,
1180                                                &null_oid, p->sm_path))) {
1181                         char *config_key = NULL;
1182                         const char *value;
1183                         int ignore_all = 0;
1184
1185                         config_key = xstrfmt("submodule.%s.ignore",
1186                                              sub->name);
1187                         if (!git_config_get_string_tmp(config_key, &value))
1188                                 ignore_all = !strcmp(value, "all");
1189                         else if (sub->ignore)
1190                                 ignore_all = !strcmp(sub->ignore, "all");
1191
1192                         free(config_key);
1193                         if (ignore_all)
1194                                 continue;
1195                 }
1196
1197                 /* Also show added or modified modules which are checked out */
1198                 strbuf_addstr(&sm_gitdir, p->sm_path);
1199                 if (is_nonbare_repository_dir(&sm_gitdir))
1200                         generate_submodule_summary(info, p);
1201                 strbuf_release(&sm_gitdir);
1202         }
1203 }
1204
1205 static void submodule_summary_callback(struct diff_queue_struct *q,
1206                                        struct diff_options *options,
1207                                        void *data)
1208 {
1209         int i;
1210         struct module_cb_list *list = data;
1211         for (i = 0; i < q->nr; i++) {
1212                 struct diff_filepair *p = q->queue[i];
1213                 struct module_cb *temp;
1214
1215                 if (!S_ISGITLINK(p->one->mode) && !S_ISGITLINK(p->two->mode))
1216                         continue;
1217                 temp = (struct module_cb*)malloc(sizeof(struct module_cb));
1218                 temp->mod_src = p->one->mode;
1219                 temp->mod_dst = p->two->mode;
1220                 temp->oid_src = p->one->oid;
1221                 temp->oid_dst = p->two->oid;
1222                 temp->status = p->status;
1223                 temp->sm_path = xstrdup(p->one->path);
1224
1225                 ALLOC_GROW(list->entries, list->nr + 1, list->alloc);
1226                 list->entries[list->nr++] = temp;
1227         }
1228 }
1229
1230 static const char *get_diff_cmd(enum diff_cmd diff_cmd)
1231 {
1232         switch (diff_cmd) {
1233         case DIFF_INDEX: return "diff-index";
1234         case DIFF_FILES: return "diff-files";
1235         default: BUG("bad diff_cmd value %d", diff_cmd);
1236         }
1237 }
1238
1239 static int compute_summary_module_list(struct object_id *head_oid,
1240                                        struct summary_cb *info,
1241                                        enum diff_cmd diff_cmd)
1242 {
1243         struct strvec diff_args = STRVEC_INIT;
1244         struct rev_info rev;
1245         struct module_cb_list list = MODULE_CB_LIST_INIT;
1246
1247         strvec_push(&diff_args, get_diff_cmd(diff_cmd));
1248         if (info->cached)
1249                 strvec_push(&diff_args, "--cached");
1250         strvec_pushl(&diff_args, "--ignore-submodules=dirty", "--raw", NULL);
1251         if (head_oid)
1252                 strvec_push(&diff_args, oid_to_hex(head_oid));
1253         strvec_push(&diff_args, "--");
1254         if (info->argc)
1255                 strvec_pushv(&diff_args, info->argv);
1256
1257         git_config(git_diff_basic_config, NULL);
1258         init_revisions(&rev, info->prefix);
1259         rev.abbrev = 0;
1260         precompose_argv(diff_args.nr, diff_args.v);
1261         setup_revisions(diff_args.nr, diff_args.v, &rev, NULL);
1262         rev.diffopt.output_format = DIFF_FORMAT_NO_OUTPUT | DIFF_FORMAT_CALLBACK;
1263         rev.diffopt.format_callback = submodule_summary_callback;
1264         rev.diffopt.format_callback_data = &list;
1265
1266         if (!info->cached) {
1267                 if (diff_cmd == DIFF_INDEX)
1268                         setup_work_tree();
1269                 if (read_cache_preload(&rev.diffopt.pathspec) < 0) {
1270                         perror("read_cache_preload");
1271                         return -1;
1272                 }
1273         } else if (read_cache() < 0) {
1274                 perror("read_cache");
1275                 return -1;
1276         }
1277
1278         if (diff_cmd == DIFF_INDEX)
1279                 run_diff_index(&rev, info->cached);
1280         else
1281                 run_diff_files(&rev, 0);
1282         prepare_submodule_summary(info, &list);
1283         strvec_clear(&diff_args);
1284         return 0;
1285 }
1286
1287 static int module_summary(int argc, const char **argv, const char *prefix)
1288 {
1289         struct summary_cb info = SUMMARY_CB_INIT;
1290         int cached = 0;
1291         int for_status = 0;
1292         int files = 0;
1293         int summary_limit = -1;
1294         enum diff_cmd diff_cmd = DIFF_INDEX;
1295         struct object_id head_oid;
1296         int ret;
1297
1298         struct option module_summary_options[] = {
1299                 OPT_BOOL(0, "cached", &cached,
1300                          N_("use the commit stored in the index instead of the submodule HEAD")),
1301                 OPT_BOOL(0, "files", &files,
1302                          N_("to compare the commit in the index with that in the submodule HEAD")),
1303                 OPT_BOOL(0, "for-status", &for_status,
1304                          N_("skip submodules with 'ignore_config' value set to 'all'")),
1305                 OPT_INTEGER('n', "summary-limit", &summary_limit,
1306                              N_("limit the summary size")),
1307                 OPT_END()
1308         };
1309
1310         const char *const git_submodule_helper_usage[] = {
1311                 N_("git submodule--helper summary [<options>] [<commit>] [--] [<path>]"),
1312                 NULL
1313         };
1314
1315         argc = parse_options(argc, argv, prefix, module_summary_options,
1316                              git_submodule_helper_usage, 0);
1317
1318         if (!summary_limit)
1319                 return 0;
1320
1321         if (!get_oid(argc ? argv[0] : "HEAD", &head_oid)) {
1322                 if (argc) {
1323                         argv++;
1324                         argc--;
1325                 }
1326         } else if (!argc || !strcmp(argv[0], "HEAD")) {
1327                 /* before the first commit: compare with an empty tree */
1328                 oidcpy(&head_oid, the_hash_algo->empty_tree);
1329                 if (argc) {
1330                         argv++;
1331                         argc--;
1332                 }
1333         } else {
1334                 if (get_oid("HEAD", &head_oid))
1335                         die(_("could not fetch a revision for HEAD"));
1336         }
1337
1338         if (files) {
1339                 if (cached)
1340                         die(_("--cached and --files are mutually exclusive"));
1341                 diff_cmd = DIFF_FILES;
1342         }
1343
1344         info.argc = argc;
1345         info.argv = argv;
1346         info.prefix = prefix;
1347         info.cached = !!cached;
1348         info.files = !!files;
1349         info.for_status = !!for_status;
1350         info.summary_limit = summary_limit;
1351
1352         ret = compute_summary_module_list((diff_cmd == DIFF_INDEX) ? &head_oid : NULL,
1353                                           &info, diff_cmd);
1354         return ret;
1355 }
1356
1357 struct sync_cb {
1358         const char *prefix;
1359         unsigned int flags;
1360 };
1361 #define SYNC_CB_INIT { NULL, 0 }
1362
1363 static void sync_submodule(const char *path, const char *prefix,
1364                            unsigned int flags)
1365 {
1366         const struct submodule *sub;
1367         char *remote_key = NULL;
1368         char *sub_origin_url, *super_config_url, *displaypath;
1369         struct strbuf sb = STRBUF_INIT;
1370         struct child_process cp = CHILD_PROCESS_INIT;
1371         char *sub_config_path = NULL;
1372
1373         if (!is_submodule_active(the_repository, path))
1374                 return;
1375
1376         sub = submodule_from_path(the_repository, &null_oid, path);
1377
1378         if (sub && sub->url) {
1379                 if (starts_with_dot_dot_slash(sub->url) ||
1380                     starts_with_dot_slash(sub->url)) {
1381                         char *remote_url, *up_path;
1382                         char *remote = get_default_remote();
1383                         strbuf_addf(&sb, "remote.%s.url", remote);
1384
1385                         if (git_config_get_string(sb.buf, &remote_url))
1386                                 remote_url = xgetcwd();
1387
1388                         up_path = get_up_path(path);
1389                         sub_origin_url = relative_url(remote_url, sub->url, up_path);
1390                         super_config_url = relative_url(remote_url, sub->url, NULL);
1391
1392                         free(remote);
1393                         free(up_path);
1394                         free(remote_url);
1395                 } else {
1396                         sub_origin_url = xstrdup(sub->url);
1397                         super_config_url = xstrdup(sub->url);
1398                 }
1399         } else {
1400                 sub_origin_url = xstrdup("");
1401                 super_config_url = xstrdup("");
1402         }
1403
1404         displaypath = get_submodule_displaypath(path, prefix);
1405
1406         if (!(flags & OPT_QUIET))
1407                 printf(_("Synchronizing submodule url for '%s'\n"),
1408                          displaypath);
1409
1410         strbuf_reset(&sb);
1411         strbuf_addf(&sb, "submodule.%s.url", sub->name);
1412         if (git_config_set_gently(sb.buf, super_config_url))
1413                 die(_("failed to register url for submodule path '%s'"),
1414                       displaypath);
1415
1416         if (!is_submodule_populated_gently(path, NULL))
1417                 goto cleanup;
1418
1419         prepare_submodule_repo_env(&cp.env_array);
1420         cp.git_cmd = 1;
1421         cp.dir = path;
1422         strvec_pushl(&cp.args, "submodule--helper",
1423                      "print-default-remote", NULL);
1424
1425         strbuf_reset(&sb);
1426         if (capture_command(&cp, &sb, 0))
1427                 die(_("failed to get the default remote for submodule '%s'"),
1428                       path);
1429
1430         strbuf_strip_suffix(&sb, "\n");
1431         remote_key = xstrfmt("remote.%s.url", sb.buf);
1432
1433         strbuf_reset(&sb);
1434         submodule_to_gitdir(&sb, path);
1435         strbuf_addstr(&sb, "/config");
1436
1437         if (git_config_set_in_file_gently(sb.buf, remote_key, sub_origin_url))
1438                 die(_("failed to update remote for submodule '%s'"),
1439                       path);
1440
1441         if (flags & OPT_RECURSIVE) {
1442                 struct child_process cpr = CHILD_PROCESS_INIT;
1443
1444                 cpr.git_cmd = 1;
1445                 cpr.dir = path;
1446                 prepare_submodule_repo_env(&cpr.env_array);
1447
1448                 strvec_push(&cpr.args, "--super-prefix");
1449                 strvec_pushf(&cpr.args, "%s/", displaypath);
1450                 strvec_pushl(&cpr.args, "submodule--helper", "sync",
1451                              "--recursive", NULL);
1452
1453                 if (flags & OPT_QUIET)
1454                         strvec_push(&cpr.args, "--quiet");
1455
1456                 if (run_command(&cpr))
1457                         die(_("failed to recurse into submodule '%s'"),
1458                               path);
1459         }
1460
1461 cleanup:
1462         free(super_config_url);
1463         free(sub_origin_url);
1464         strbuf_release(&sb);
1465         free(remote_key);
1466         free(displaypath);
1467         free(sub_config_path);
1468 }
1469
1470 static void sync_submodule_cb(const struct cache_entry *list_item, void *cb_data)
1471 {
1472         struct sync_cb *info = cb_data;
1473         sync_submodule(list_item->name, info->prefix, info->flags);
1474 }
1475
1476 static int module_sync(int argc, const char **argv, const char *prefix)
1477 {
1478         struct sync_cb info = SYNC_CB_INIT;
1479         struct pathspec pathspec;
1480         struct module_list list = MODULE_LIST_INIT;
1481         int quiet = 0;
1482         int recursive = 0;
1483
1484         struct option module_sync_options[] = {
1485                 OPT__QUIET(&quiet, N_("suppress output of synchronizing submodule url")),
1486                 OPT_BOOL(0, "recursive", &recursive,
1487                         N_("recurse into nested submodules")),
1488                 OPT_END()
1489         };
1490
1491         const char *const git_submodule_helper_usage[] = {
1492                 N_("git submodule--helper sync [--quiet] [--recursive] [<path>]"),
1493                 NULL
1494         };
1495
1496         argc = parse_options(argc, argv, prefix, module_sync_options,
1497                              git_submodule_helper_usage, 0);
1498
1499         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1500                 return 1;
1501
1502         info.prefix = prefix;
1503         if (quiet)
1504                 info.flags |= OPT_QUIET;
1505         if (recursive)
1506                 info.flags |= OPT_RECURSIVE;
1507
1508         for_each_listed_submodule(&list, sync_submodule_cb, &info);
1509
1510         return 0;
1511 }
1512
1513 struct deinit_cb {
1514         const char *prefix;
1515         unsigned int flags;
1516 };
1517 #define DEINIT_CB_INIT { NULL, 0 }
1518
1519 static void deinit_submodule(const char *path, const char *prefix,
1520                              unsigned int flags)
1521 {
1522         const struct submodule *sub;
1523         char *displaypath = NULL;
1524         struct child_process cp_config = CHILD_PROCESS_INIT;
1525         struct strbuf sb_config = STRBUF_INIT;
1526         char *sub_git_dir = xstrfmt("%s/.git", path);
1527
1528         sub = submodule_from_path(the_repository, &null_oid, path);
1529
1530         if (!sub || !sub->name)
1531                 goto cleanup;
1532
1533         displaypath = get_submodule_displaypath(path, prefix);
1534
1535         /* remove the submodule work tree (unless the user already did it) */
1536         if (is_directory(path)) {
1537                 struct strbuf sb_rm = STRBUF_INIT;
1538                 const char *format;
1539
1540                 /*
1541                  * protect submodules containing a .git directory
1542                  * NEEDSWORK: instead of dying, automatically call
1543                  * absorbgitdirs and (possibly) warn.
1544                  */
1545                 if (is_directory(sub_git_dir))
1546                         die(_("Submodule work tree '%s' contains a .git "
1547                               "directory (use 'rm -rf' if you really want "
1548                               "to remove it including all of its history)"),
1549                             displaypath);
1550
1551                 if (!(flags & OPT_FORCE)) {
1552                         struct child_process cp_rm = CHILD_PROCESS_INIT;
1553                         cp_rm.git_cmd = 1;
1554                         strvec_pushl(&cp_rm.args, "rm", "-qn",
1555                                      path, NULL);
1556
1557                         if (run_command(&cp_rm))
1558                                 die(_("Submodule work tree '%s' contains local "
1559                                       "modifications; use '-f' to discard them"),
1560                                       displaypath);
1561                 }
1562
1563                 strbuf_addstr(&sb_rm, path);
1564
1565                 if (!remove_dir_recursively(&sb_rm, 0))
1566                         format = _("Cleared directory '%s'\n");
1567                 else
1568                         format = _("Could not remove submodule work tree '%s'\n");
1569
1570                 if (!(flags & OPT_QUIET))
1571                         printf(format, displaypath);
1572
1573                 submodule_unset_core_worktree(sub);
1574
1575                 strbuf_release(&sb_rm);
1576         }
1577
1578         if (mkdir(path, 0777))
1579                 printf(_("could not create empty submodule directory %s"),
1580                       displaypath);
1581
1582         cp_config.git_cmd = 1;
1583         strvec_pushl(&cp_config.args, "config", "--get-regexp", NULL);
1584         strvec_pushf(&cp_config.args, "submodule.%s\\.", sub->name);
1585
1586         /* remove the .git/config entries (unless the user already did it) */
1587         if (!capture_command(&cp_config, &sb_config, 0) && sb_config.len) {
1588                 char *sub_key = xstrfmt("submodule.%s", sub->name);
1589                 /*
1590                  * remove the whole section so we have a clean state when
1591                  * the user later decides to init this submodule again
1592                  */
1593                 git_config_rename_section_in_file(NULL, sub_key, NULL);
1594                 if (!(flags & OPT_QUIET))
1595                         printf(_("Submodule '%s' (%s) unregistered for path '%s'\n"),
1596                                  sub->name, sub->url, displaypath);
1597                 free(sub_key);
1598         }
1599
1600 cleanup:
1601         free(displaypath);
1602         free(sub_git_dir);
1603         strbuf_release(&sb_config);
1604 }
1605
1606 static void deinit_submodule_cb(const struct cache_entry *list_item,
1607                                 void *cb_data)
1608 {
1609         struct deinit_cb *info = cb_data;
1610         deinit_submodule(list_item->name, info->prefix, info->flags);
1611 }
1612
1613 static int module_deinit(int argc, const char **argv, const char *prefix)
1614 {
1615         struct deinit_cb info = DEINIT_CB_INIT;
1616         struct pathspec pathspec;
1617         struct module_list list = MODULE_LIST_INIT;
1618         int quiet = 0;
1619         int force = 0;
1620         int all = 0;
1621
1622         struct option module_deinit_options[] = {
1623                 OPT__QUIET(&quiet, N_("suppress submodule status output")),
1624                 OPT__FORCE(&force, N_("remove submodule working trees even if they contain local changes"), 0),
1625                 OPT_BOOL(0, "all", &all, N_("unregister all submodules")),
1626                 OPT_END()
1627         };
1628
1629         const char *const git_submodule_helper_usage[] = {
1630                 N_("git submodule deinit [--quiet] [-f | --force] [--all | [--] [<path>...]]"),
1631                 NULL
1632         };
1633
1634         argc = parse_options(argc, argv, prefix, module_deinit_options,
1635                              git_submodule_helper_usage, 0);
1636
1637         if (all && argc) {
1638                 error("pathspec and --all are incompatible");
1639                 usage_with_options(git_submodule_helper_usage,
1640                                    module_deinit_options);
1641         }
1642
1643         if (!argc && !all)
1644                 die(_("Use '--all' if you really want to deinitialize all submodules"));
1645
1646         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1647                 return 1;
1648
1649         info.prefix = prefix;
1650         if (quiet)
1651                 info.flags |= OPT_QUIET;
1652         if (force)
1653                 info.flags |= OPT_FORCE;
1654
1655         for_each_listed_submodule(&list, deinit_submodule_cb, &info);
1656
1657         return 0;
1658 }
1659
1660 static int clone_submodule(const char *path, const char *gitdir, const char *url,
1661                            const char *depth, struct string_list *reference, int dissociate,
1662                            int quiet, int progress, int single_branch)
1663 {
1664         struct child_process cp = CHILD_PROCESS_INIT;
1665
1666         strvec_push(&cp.args, "clone");
1667         strvec_push(&cp.args, "--no-checkout");
1668         if (quiet)
1669                 strvec_push(&cp.args, "--quiet");
1670         if (progress)
1671                 strvec_push(&cp.args, "--progress");
1672         if (depth && *depth)
1673                 strvec_pushl(&cp.args, "--depth", depth, NULL);
1674         if (reference->nr) {
1675                 struct string_list_item *item;
1676                 for_each_string_list_item(item, reference)
1677                         strvec_pushl(&cp.args, "--reference",
1678                                      item->string, NULL);
1679         }
1680         if (dissociate)
1681                 strvec_push(&cp.args, "--dissociate");
1682         if (gitdir && *gitdir)
1683                 strvec_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
1684         if (single_branch >= 0)
1685                 strvec_push(&cp.args, single_branch ?
1686                                           "--single-branch" :
1687                                           "--no-single-branch");
1688
1689         strvec_push(&cp.args, "--");
1690         strvec_push(&cp.args, url);
1691         strvec_push(&cp.args, path);
1692
1693         cp.git_cmd = 1;
1694         prepare_submodule_repo_env(&cp.env_array);
1695         cp.no_stdin = 1;
1696
1697         return run_command(&cp);
1698 }
1699
1700 struct submodule_alternate_setup {
1701         const char *submodule_name;
1702         enum SUBMODULE_ALTERNATE_ERROR_MODE {
1703                 SUBMODULE_ALTERNATE_ERROR_DIE,
1704                 SUBMODULE_ALTERNATE_ERROR_INFO,
1705                 SUBMODULE_ALTERNATE_ERROR_IGNORE
1706         } error_mode;
1707         struct string_list *reference;
1708 };
1709 #define SUBMODULE_ALTERNATE_SETUP_INIT { NULL, \
1710         SUBMODULE_ALTERNATE_ERROR_IGNORE, NULL }
1711
1712 static const char alternate_error_advice[] = N_(
1713 "An alternate computed from a superproject's alternate is invalid.\n"
1714 "To allow Git to clone without an alternate in such a case, set\n"
1715 "submodule.alternateErrorStrategy to 'info' or, equivalently, clone with\n"
1716 "'--reference-if-able' instead of '--reference'."
1717 );
1718
1719 static int add_possible_reference_from_superproject(
1720                 struct object_directory *odb, void *sas_cb)
1721 {
1722         struct submodule_alternate_setup *sas = sas_cb;
1723         size_t len;
1724
1725         /*
1726          * If the alternate object store is another repository, try the
1727          * standard layout with .git/(modules/<name>)+/objects
1728          */
1729         if (strip_suffix(odb->path, "/objects", &len)) {
1730                 char *sm_alternate;
1731                 struct strbuf sb = STRBUF_INIT;
1732                 struct strbuf err = STRBUF_INIT;
1733                 strbuf_add(&sb, odb->path, len);
1734
1735                 /*
1736                  * We need to end the new path with '/' to mark it as a dir,
1737                  * otherwise a submodule name containing '/' will be broken
1738                  * as the last part of a missing submodule reference would
1739                  * be taken as a file name.
1740                  */
1741                 strbuf_addf(&sb, "/modules/%s/", sas->submodule_name);
1742
1743                 sm_alternate = compute_alternate_path(sb.buf, &err);
1744                 if (sm_alternate) {
1745                         string_list_append(sas->reference, xstrdup(sb.buf));
1746                         free(sm_alternate);
1747                 } else {
1748                         switch (sas->error_mode) {
1749                         case SUBMODULE_ALTERNATE_ERROR_DIE:
1750                                 if (advice_submodule_alternate_error_strategy_die)
1751                                         advise(_(alternate_error_advice));
1752                                 die(_("submodule '%s' cannot add alternate: %s"),
1753                                     sas->submodule_name, err.buf);
1754                         case SUBMODULE_ALTERNATE_ERROR_INFO:
1755                                 fprintf_ln(stderr, _("submodule '%s' cannot add alternate: %s"),
1756                                         sas->submodule_name, err.buf);
1757                         case SUBMODULE_ALTERNATE_ERROR_IGNORE:
1758                                 ; /* nothing */
1759                         }
1760                 }
1761                 strbuf_release(&sb);
1762         }
1763
1764         return 0;
1765 }
1766
1767 static void prepare_possible_alternates(const char *sm_name,
1768                 struct string_list *reference)
1769 {
1770         char *sm_alternate = NULL, *error_strategy = NULL;
1771         struct submodule_alternate_setup sas = SUBMODULE_ALTERNATE_SETUP_INIT;
1772
1773         git_config_get_string("submodule.alternateLocation", &sm_alternate);
1774         if (!sm_alternate)
1775                 return;
1776
1777         git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
1778
1779         if (!error_strategy)
1780                 error_strategy = xstrdup("die");
1781
1782         sas.submodule_name = sm_name;
1783         sas.reference = reference;
1784         if (!strcmp(error_strategy, "die"))
1785                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_DIE;
1786         else if (!strcmp(error_strategy, "info"))
1787                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_INFO;
1788         else if (!strcmp(error_strategy, "ignore"))
1789                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_IGNORE;
1790         else
1791                 die(_("Value '%s' for submodule.alternateErrorStrategy is not recognized"), error_strategy);
1792
1793         if (!strcmp(sm_alternate, "superproject"))
1794                 foreach_alt_odb(add_possible_reference_from_superproject, &sas);
1795         else if (!strcmp(sm_alternate, "no"))
1796                 ; /* do nothing */
1797         else
1798                 die(_("Value '%s' for submodule.alternateLocation is not recognized"), sm_alternate);
1799
1800         free(sm_alternate);
1801         free(error_strategy);
1802 }
1803
1804 static int module_clone(int argc, const char **argv, const char *prefix)
1805 {
1806         const char *name = NULL, *url = NULL, *depth = NULL;
1807         int quiet = 0;
1808         int progress = 0;
1809         char *p, *path = NULL, *sm_gitdir;
1810         struct strbuf sb = STRBUF_INIT;
1811         struct string_list reference = STRING_LIST_INIT_NODUP;
1812         int dissociate = 0, require_init = 0;
1813         char *sm_alternate = NULL, *error_strategy = NULL;
1814         int single_branch = -1;
1815
1816         struct option module_clone_options[] = {
1817                 OPT_STRING(0, "prefix", &prefix,
1818                            N_("path"),
1819                            N_("alternative anchor for relative paths")),
1820                 OPT_STRING(0, "path", &path,
1821                            N_("path"),
1822                            N_("where the new submodule will be cloned to")),
1823                 OPT_STRING(0, "name", &name,
1824                            N_("string"),
1825                            N_("name of the new submodule")),
1826                 OPT_STRING(0, "url", &url,
1827                            N_("string"),
1828                            N_("url where to clone the submodule from")),
1829                 OPT_STRING_LIST(0, "reference", &reference,
1830                            N_("repo"),
1831                            N_("reference repository")),
1832                 OPT_BOOL(0, "dissociate", &dissociate,
1833                            N_("use --reference only while cloning")),
1834                 OPT_STRING(0, "depth", &depth,
1835                            N_("string"),
1836                            N_("depth for shallow clones")),
1837                 OPT__QUIET(&quiet, "Suppress output for cloning a submodule"),
1838                 OPT_BOOL(0, "progress", &progress,
1839                            N_("force cloning progress")),
1840                 OPT_BOOL(0, "require-init", &require_init,
1841                            N_("disallow cloning into non-empty directory")),
1842                 OPT_BOOL(0, "single-branch", &single_branch,
1843                          N_("clone only one branch, HEAD or --branch")),
1844                 OPT_END()
1845         };
1846
1847         const char *const git_submodule_helper_usage[] = {
1848                 N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
1849                    "[--reference <repository>] [--name <name>] [--depth <depth>] "
1850                    "[--single-branch] "
1851                    "--url <url> --path <path>"),
1852                 NULL
1853         };
1854
1855         argc = parse_options(argc, argv, prefix, module_clone_options,
1856                              git_submodule_helper_usage, 0);
1857
1858         if (argc || !url || !path || !*path)
1859                 usage_with_options(git_submodule_helper_usage,
1860                                    module_clone_options);
1861
1862         strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
1863         sm_gitdir = absolute_pathdup(sb.buf);
1864         strbuf_reset(&sb);
1865
1866         if (!is_absolute_path(path)) {
1867                 strbuf_addf(&sb, "%s/%s", get_git_work_tree(), path);
1868                 path = strbuf_detach(&sb, NULL);
1869         } else
1870                 path = xstrdup(path);
1871
1872         if (validate_submodule_git_dir(sm_gitdir, name) < 0)
1873                 die(_("refusing to create/use '%s' in another submodule's "
1874                         "git dir"), sm_gitdir);
1875
1876         if (!file_exists(sm_gitdir)) {
1877                 if (safe_create_leading_directories_const(sm_gitdir) < 0)
1878                         die(_("could not create directory '%s'"), sm_gitdir);
1879
1880                 prepare_possible_alternates(name, &reference);
1881
1882                 if (clone_submodule(path, sm_gitdir, url, depth, &reference, dissociate,
1883                                     quiet, progress, single_branch))
1884                         die(_("clone of '%s' into submodule path '%s' failed"),
1885                             url, path);
1886         } else {
1887                 if (require_init && !access(path, X_OK) && !is_empty_dir(path))
1888                         die(_("directory not empty: '%s'"), path);
1889                 if (safe_create_leading_directories_const(path) < 0)
1890                         die(_("could not create directory '%s'"), path);
1891                 strbuf_addf(&sb, "%s/index", sm_gitdir);
1892                 unlink_or_warn(sb.buf);
1893                 strbuf_reset(&sb);
1894         }
1895
1896         connect_work_tree_and_git_dir(path, sm_gitdir, 0);
1897
1898         p = git_pathdup_submodule(path, "config");
1899         if (!p)
1900                 die(_("could not get submodule directory for '%s'"), path);
1901
1902         /* setup alternateLocation and alternateErrorStrategy in the cloned submodule if needed */
1903         git_config_get_string("submodule.alternateLocation", &sm_alternate);
1904         if (sm_alternate)
1905                 git_config_set_in_file(p, "submodule.alternateLocation",
1906                                            sm_alternate);
1907         git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
1908         if (error_strategy)
1909                 git_config_set_in_file(p, "submodule.alternateErrorStrategy",
1910                                            error_strategy);
1911
1912         free(sm_alternate);
1913         free(error_strategy);
1914
1915         strbuf_release(&sb);
1916         free(sm_gitdir);
1917         free(path);
1918         free(p);
1919         return 0;
1920 }
1921
1922 static void determine_submodule_update_strategy(struct repository *r,
1923                                                 int just_cloned,
1924                                                 const char *path,
1925                                                 const char *update,
1926                                                 struct submodule_update_strategy *out)
1927 {
1928         const struct submodule *sub = submodule_from_path(r, &null_oid, path);
1929         char *key;
1930         const char *val;
1931
1932         key = xstrfmt("submodule.%s.update", sub->name);
1933
1934         if (update) {
1935                 if (parse_submodule_update_strategy(update, out) < 0)
1936                         die(_("Invalid update mode '%s' for submodule path '%s'"),
1937                                 update, path);
1938         } else if (!repo_config_get_string_tmp(r, key, &val)) {
1939                 if (parse_submodule_update_strategy(val, out) < 0)
1940                         die(_("Invalid update mode '%s' configured for submodule path '%s'"),
1941                                 val, path);
1942         } else if (sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
1943                 if (sub->update_strategy.type == SM_UPDATE_COMMAND)
1944                         BUG("how did we read update = !command from .gitmodules?");
1945                 out->type = sub->update_strategy.type;
1946                 out->command = sub->update_strategy.command;
1947         } else
1948                 out->type = SM_UPDATE_CHECKOUT;
1949
1950         if (just_cloned &&
1951             (out->type == SM_UPDATE_MERGE ||
1952              out->type == SM_UPDATE_REBASE ||
1953              out->type == SM_UPDATE_NONE))
1954                 out->type = SM_UPDATE_CHECKOUT;
1955
1956         free(key);
1957 }
1958
1959 static int module_update_module_mode(int argc, const char **argv, const char *prefix)
1960 {
1961         const char *path, *update = NULL;
1962         int just_cloned;
1963         struct submodule_update_strategy update_strategy = { .type = SM_UPDATE_CHECKOUT };
1964
1965         if (argc < 3 || argc > 4)
1966                 die("submodule--helper update-module-clone expects <just-cloned> <path> [<update>]");
1967
1968         just_cloned = git_config_int("just_cloned", argv[1]);
1969         path = argv[2];
1970
1971         if (argc == 4)
1972                 update = argv[3];
1973
1974         determine_submodule_update_strategy(the_repository,
1975                                             just_cloned, path, update,
1976                                             &update_strategy);
1977         fputs(submodule_strategy_to_string(&update_strategy), stdout);
1978
1979         return 0;
1980 }
1981
1982 struct update_clone_data {
1983         const struct submodule *sub;
1984         struct object_id oid;
1985         unsigned just_cloned;
1986 };
1987
1988 struct submodule_update_clone {
1989         /* index into 'list', the list of submodules to look into for cloning */
1990         int current;
1991         struct module_list list;
1992         unsigned warn_if_uninitialized : 1;
1993
1994         /* update parameter passed via commandline */
1995         struct submodule_update_strategy update;
1996
1997         /* configuration parameters which are passed on to the children */
1998         int progress;
1999         int quiet;
2000         int recommend_shallow;
2001         struct string_list references;
2002         int dissociate;
2003         unsigned require_init;
2004         const char *depth;
2005         const char *recursive_prefix;
2006         const char *prefix;
2007         int single_branch;
2008
2009         /* to be consumed by git-submodule.sh */
2010         struct update_clone_data *update_clone;
2011         int update_clone_nr; int update_clone_alloc;
2012
2013         /* If we want to stop as fast as possible and return an error */
2014         unsigned quickstop : 1;
2015
2016         /* failed clones to be retried again */
2017         const struct cache_entry **failed_clones;
2018         int failed_clones_nr, failed_clones_alloc;
2019
2020         int max_jobs;
2021 };
2022 #define SUBMODULE_UPDATE_CLONE_INIT { \
2023         .list = MODULE_LIST_INIT, \
2024         .update = SUBMODULE_UPDATE_STRATEGY_INIT, \
2025         .recommend_shallow = -1, \
2026         .references = STRING_LIST_INIT_DUP, \
2027         .single_branch = -1, \
2028         .max_jobs = 1, \
2029 }
2030
2031
2032 static void next_submodule_warn_missing(struct submodule_update_clone *suc,
2033                 struct strbuf *out, const char *displaypath)
2034 {
2035         /*
2036          * Only mention uninitialized submodules when their
2037          * paths have been specified.
2038          */
2039         if (suc->warn_if_uninitialized) {
2040                 strbuf_addf(out,
2041                         _("Submodule path '%s' not initialized"),
2042                         displaypath);
2043                 strbuf_addch(out, '\n');
2044                 strbuf_addstr(out,
2045                         _("Maybe you want to use 'update --init'?"));
2046                 strbuf_addch(out, '\n');
2047         }
2048 }
2049
2050 /**
2051  * Determine whether 'ce' needs to be cloned. If so, prepare the 'child' to
2052  * run the clone. Returns 1 if 'ce' needs to be cloned, 0 otherwise.
2053  */
2054 static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
2055                                            struct child_process *child,
2056                                            struct submodule_update_clone *suc,
2057                                            struct strbuf *out)
2058 {
2059         const struct submodule *sub = NULL;
2060         const char *url = NULL;
2061         const char *update_string;
2062         enum submodule_update_type update_type;
2063         char *key;
2064         struct strbuf displaypath_sb = STRBUF_INIT;
2065         struct strbuf sb = STRBUF_INIT;
2066         const char *displaypath = NULL;
2067         int needs_cloning = 0;
2068         int need_free_url = 0;
2069
2070         if (ce_stage(ce)) {
2071                 if (suc->recursive_prefix)
2072                         strbuf_addf(&sb, "%s/%s", suc->recursive_prefix, ce->name);
2073                 else
2074                         strbuf_addstr(&sb, ce->name);
2075                 strbuf_addf(out, _("Skipping unmerged submodule %s"), sb.buf);
2076                 strbuf_addch(out, '\n');
2077                 goto cleanup;
2078         }
2079
2080         sub = submodule_from_path(the_repository, &null_oid, ce->name);
2081
2082         if (suc->recursive_prefix)
2083                 displaypath = relative_path(suc->recursive_prefix,
2084                                             ce->name, &displaypath_sb);
2085         else
2086                 displaypath = ce->name;
2087
2088         if (!sub) {
2089                 next_submodule_warn_missing(suc, out, displaypath);
2090                 goto cleanup;
2091         }
2092
2093         key = xstrfmt("submodule.%s.update", sub->name);
2094         if (!repo_config_get_string_tmp(the_repository, key, &update_string)) {
2095                 update_type = parse_submodule_update_type(update_string);
2096         } else {
2097                 update_type = sub->update_strategy.type;
2098         }
2099         free(key);
2100
2101         if (suc->update.type == SM_UPDATE_NONE
2102             || (suc->update.type == SM_UPDATE_UNSPECIFIED
2103                 && update_type == SM_UPDATE_NONE)) {
2104                 strbuf_addf(out, _("Skipping submodule '%s'"), displaypath);
2105                 strbuf_addch(out, '\n');
2106                 goto cleanup;
2107         }
2108
2109         /* Check if the submodule has been initialized. */
2110         if (!is_submodule_active(the_repository, ce->name)) {
2111                 next_submodule_warn_missing(suc, out, displaypath);
2112                 goto cleanup;
2113         }
2114
2115         strbuf_reset(&sb);
2116         strbuf_addf(&sb, "submodule.%s.url", sub->name);
2117         if (repo_config_get_string_tmp(the_repository, sb.buf, &url)) {
2118                 if (starts_with_dot_slash(sub->url) ||
2119                     starts_with_dot_dot_slash(sub->url)) {
2120                         url = compute_submodule_clone_url(sub->url);
2121                         need_free_url = 1;
2122                 } else
2123                         url = sub->url;
2124         }
2125
2126         strbuf_reset(&sb);
2127         strbuf_addf(&sb, "%s/.git", ce->name);
2128         needs_cloning = !file_exists(sb.buf);
2129
2130         ALLOC_GROW(suc->update_clone, suc->update_clone_nr + 1,
2131                    suc->update_clone_alloc);
2132         oidcpy(&suc->update_clone[suc->update_clone_nr].oid, &ce->oid);
2133         suc->update_clone[suc->update_clone_nr].just_cloned = needs_cloning;
2134         suc->update_clone[suc->update_clone_nr].sub = sub;
2135         suc->update_clone_nr++;
2136
2137         if (!needs_cloning)
2138                 goto cleanup;
2139
2140         child->git_cmd = 1;
2141         child->no_stdin = 1;
2142         child->stdout_to_stderr = 1;
2143         child->err = -1;
2144         strvec_push(&child->args, "submodule--helper");
2145         strvec_push(&child->args, "clone");
2146         if (suc->progress)
2147                 strvec_push(&child->args, "--progress");
2148         if (suc->quiet)
2149                 strvec_push(&child->args, "--quiet");
2150         if (suc->prefix)
2151                 strvec_pushl(&child->args, "--prefix", suc->prefix, NULL);
2152         if (suc->recommend_shallow && sub->recommend_shallow == 1)
2153                 strvec_push(&child->args, "--depth=1");
2154         if (suc->require_init)
2155                 strvec_push(&child->args, "--require-init");
2156         strvec_pushl(&child->args, "--path", sub->path, NULL);
2157         strvec_pushl(&child->args, "--name", sub->name, NULL);
2158         strvec_pushl(&child->args, "--url", url, NULL);
2159         if (suc->references.nr) {
2160                 struct string_list_item *item;
2161                 for_each_string_list_item(item, &suc->references)
2162                         strvec_pushl(&child->args, "--reference", item->string, NULL);
2163         }
2164         if (suc->dissociate)
2165                 strvec_push(&child->args, "--dissociate");
2166         if (suc->depth)
2167                 strvec_push(&child->args, suc->depth);
2168         if (suc->single_branch >= 0)
2169                 strvec_push(&child->args, suc->single_branch ?
2170                                               "--single-branch" :
2171                                               "--no-single-branch");
2172
2173 cleanup:
2174         strbuf_release(&displaypath_sb);
2175         strbuf_release(&sb);
2176         if (need_free_url)
2177                 free((void*)url);
2178
2179         return needs_cloning;
2180 }
2181
2182 static int update_clone_get_next_task(struct child_process *child,
2183                                       struct strbuf *err,
2184                                       void *suc_cb,
2185                                       void **idx_task_cb)
2186 {
2187         struct submodule_update_clone *suc = suc_cb;
2188         const struct cache_entry *ce;
2189         int index;
2190
2191         for (; suc->current < suc->list.nr; suc->current++) {
2192                 ce = suc->list.entries[suc->current];
2193                 if (prepare_to_clone_next_submodule(ce, child, suc, err)) {
2194                         int *p = xmalloc(sizeof(*p));
2195                         *p = suc->current;
2196                         *idx_task_cb = p;
2197                         suc->current++;
2198                         return 1;
2199                 }
2200         }
2201
2202         /*
2203          * The loop above tried cloning each submodule once, now try the
2204          * stragglers again, which we can imagine as an extension of the
2205          * entry list.
2206          */
2207         index = suc->current - suc->list.nr;
2208         if (index < suc->failed_clones_nr) {
2209                 int *p;
2210                 ce = suc->failed_clones[index];
2211                 if (!prepare_to_clone_next_submodule(ce, child, suc, err)) {
2212                         suc->current ++;
2213                         strbuf_addstr(err, "BUG: submodule considered for "
2214                                            "cloning, doesn't need cloning "
2215                                            "any more?\n");
2216                         return 0;
2217                 }
2218                 p = xmalloc(sizeof(*p));
2219                 *p = suc->current;
2220                 *idx_task_cb = p;
2221                 suc->current ++;
2222                 return 1;
2223         }
2224
2225         return 0;
2226 }
2227
2228 static int update_clone_start_failure(struct strbuf *err,
2229                                       void *suc_cb,
2230                                       void *idx_task_cb)
2231 {
2232         struct submodule_update_clone *suc = suc_cb;
2233         suc->quickstop = 1;
2234         return 1;
2235 }
2236
2237 static int update_clone_task_finished(int result,
2238                                       struct strbuf *err,
2239                                       void *suc_cb,
2240                                       void *idx_task_cb)
2241 {
2242         const struct cache_entry *ce;
2243         struct submodule_update_clone *suc = suc_cb;
2244
2245         int *idxP = idx_task_cb;
2246         int idx = *idxP;
2247         free(idxP);
2248
2249         if (!result)
2250                 return 0;
2251
2252         if (idx < suc->list.nr) {
2253                 ce  = suc->list.entries[idx];
2254                 strbuf_addf(err, _("Failed to clone '%s'. Retry scheduled"),
2255                             ce->name);
2256                 strbuf_addch(err, '\n');
2257                 ALLOC_GROW(suc->failed_clones,
2258                            suc->failed_clones_nr + 1,
2259                            suc->failed_clones_alloc);
2260                 suc->failed_clones[suc->failed_clones_nr++] = ce;
2261                 return 0;
2262         } else {
2263                 idx -= suc->list.nr;
2264                 ce  = suc->failed_clones[idx];
2265                 strbuf_addf(err, _("Failed to clone '%s' a second time, aborting"),
2266                             ce->name);
2267                 strbuf_addch(err, '\n');
2268                 suc->quickstop = 1;
2269                 return 1;
2270         }
2271
2272         return 0;
2273 }
2274
2275 static int git_update_clone_config(const char *var, const char *value,
2276                                    void *cb)
2277 {
2278         int *max_jobs = cb;
2279         if (!strcmp(var, "submodule.fetchjobs"))
2280                 *max_jobs = parse_submodule_fetchjobs(var, value);
2281         return 0;
2282 }
2283
2284 static void update_submodule(struct update_clone_data *ucd)
2285 {
2286         fprintf(stdout, "dummy %s %d\t%s\n",
2287                 oid_to_hex(&ucd->oid),
2288                 ucd->just_cloned,
2289                 ucd->sub->path);
2290 }
2291
2292 static int update_submodules(struct submodule_update_clone *suc)
2293 {
2294         int i;
2295
2296         run_processes_parallel_tr2(suc->max_jobs, update_clone_get_next_task,
2297                                    update_clone_start_failure,
2298                                    update_clone_task_finished, suc, "submodule",
2299                                    "parallel/update");
2300
2301         /*
2302          * We saved the output and put it out all at once now.
2303          * That means:
2304          * - the listener does not have to interleave their (checkout)
2305          *   work with our fetching.  The writes involved in a
2306          *   checkout involve more straightforward sequential I/O.
2307          * - the listener can avoid doing any work if fetching failed.
2308          */
2309         if (suc->quickstop)
2310                 return 1;
2311
2312         for (i = 0; i < suc->update_clone_nr; i++)
2313                 update_submodule(&suc->update_clone[i]);
2314
2315         return 0;
2316 }
2317
2318 static int update_clone(int argc, const char **argv, const char *prefix)
2319 {
2320         const char *update = NULL;
2321         struct pathspec pathspec;
2322         struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
2323
2324         struct option module_update_clone_options[] = {
2325                 OPT_STRING(0, "prefix", &prefix,
2326                            N_("path"),
2327                            N_("path into the working tree")),
2328                 OPT_STRING(0, "recursive-prefix", &suc.recursive_prefix,
2329                            N_("path"),
2330                            N_("path into the working tree, across nested "
2331                               "submodule boundaries")),
2332                 OPT_STRING(0, "update", &update,
2333                            N_("string"),
2334                            N_("rebase, merge, checkout or none")),
2335                 OPT_STRING_LIST(0, "reference", &suc.references, N_("repo"),
2336                            N_("reference repository")),
2337                 OPT_BOOL(0, "dissociate", &suc.dissociate,
2338                            N_("use --reference only while cloning")),
2339                 OPT_STRING(0, "depth", &suc.depth, "<depth>",
2340                            N_("create a shallow clone truncated to the "
2341                               "specified number of revisions")),
2342                 OPT_INTEGER('j', "jobs", &suc.max_jobs,
2343                             N_("parallel jobs")),
2344                 OPT_BOOL(0, "recommend-shallow", &suc.recommend_shallow,
2345                             N_("whether the initial clone should follow the shallow recommendation")),
2346                 OPT__QUIET(&suc.quiet, N_("don't print cloning progress")),
2347                 OPT_BOOL(0, "progress", &suc.progress,
2348                             N_("force cloning progress")),
2349                 OPT_BOOL(0, "require-init", &suc.require_init,
2350                            N_("disallow cloning into non-empty directory")),
2351                 OPT_BOOL(0, "single-branch", &suc.single_branch,
2352                          N_("clone only one branch, HEAD or --branch")),
2353                 OPT_END()
2354         };
2355
2356         const char *const git_submodule_helper_usage[] = {
2357                 N_("git submodule--helper update-clone [--prefix=<path>] [<path>...]"),
2358                 NULL
2359         };
2360         suc.prefix = prefix;
2361
2362         update_clone_config_from_gitmodules(&suc.max_jobs);
2363         git_config(git_update_clone_config, &suc.max_jobs);
2364
2365         argc = parse_options(argc, argv, prefix, module_update_clone_options,
2366                              git_submodule_helper_usage, 0);
2367
2368         if (update)
2369                 if (parse_submodule_update_strategy(update, &suc.update) < 0)
2370                         die(_("bad value for update parameter"));
2371
2372         if (module_list_compute(argc, argv, prefix, &pathspec, &suc.list) < 0)
2373                 return 1;
2374
2375         if (pathspec.nr)
2376                 suc.warn_if_uninitialized = 1;
2377
2378         return update_submodules(&suc);
2379 }
2380
2381 static int resolve_relative_path(int argc, const char **argv, const char *prefix)
2382 {
2383         struct strbuf sb = STRBUF_INIT;
2384         if (argc != 3)
2385                 die("submodule--helper relative-path takes exactly 2 arguments, got %d", argc);
2386
2387         printf("%s", relative_path(argv[1], argv[2], &sb));
2388         strbuf_release(&sb);
2389         return 0;
2390 }
2391
2392 static const char *remote_submodule_branch(const char *path)
2393 {
2394         const struct submodule *sub;
2395         const char *branch = NULL;
2396         char *key;
2397
2398         sub = submodule_from_path(the_repository, &null_oid, path);
2399         if (!sub)
2400                 return NULL;
2401
2402         key = xstrfmt("submodule.%s.branch", sub->name);
2403         if (repo_config_get_string_tmp(the_repository, key, &branch))
2404                 branch = sub->branch;
2405         free(key);
2406
2407         if (!branch)
2408                 return "HEAD";
2409
2410         if (!strcmp(branch, ".")) {
2411                 const char *refname = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
2412
2413                 if (!refname)
2414                         die(_("No such ref: %s"), "HEAD");
2415
2416                 /* detached HEAD */
2417                 if (!strcmp(refname, "HEAD"))
2418                         die(_("Submodule (%s) branch configured to inherit "
2419                               "branch from superproject, but the superproject "
2420                               "is not on any branch"), sub->name);
2421
2422                 if (!skip_prefix(refname, "refs/heads/", &refname))
2423                         die(_("Expecting a full ref name, got %s"), refname);
2424                 return refname;
2425         }
2426
2427         return branch;
2428 }
2429
2430 static int resolve_remote_submodule_branch(int argc, const char **argv,
2431                 const char *prefix)
2432 {
2433         const char *ret;
2434         struct strbuf sb = STRBUF_INIT;
2435         if (argc != 2)
2436                 die("submodule--helper remote-branch takes exactly one arguments, got %d", argc);
2437
2438         ret = remote_submodule_branch(argv[1]);
2439         if (!ret)
2440                 die("submodule %s doesn't exist", argv[1]);
2441
2442         printf("%s", ret);
2443         strbuf_release(&sb);
2444         return 0;
2445 }
2446
2447 static int push_check(int argc, const char **argv, const char *prefix)
2448 {
2449         struct remote *remote;
2450         const char *superproject_head;
2451         char *head;
2452         int detached_head = 0;
2453         struct object_id head_oid;
2454
2455         if (argc < 3)
2456                 die("submodule--helper push-check requires at least 2 arguments");
2457
2458         /*
2459          * superproject's resolved head ref.
2460          * if HEAD then the superproject is in a detached head state, otherwise
2461          * it will be the resolved head ref.
2462          */
2463         superproject_head = argv[1];
2464         argv++;
2465         argc--;
2466         /* Get the submodule's head ref and determine if it is detached */
2467         head = resolve_refdup("HEAD", 0, &head_oid, NULL);
2468         if (!head)
2469                 die(_("Failed to resolve HEAD as a valid ref."));
2470         if (!strcmp(head, "HEAD"))
2471                 detached_head = 1;
2472
2473         /*
2474          * The remote must be configured.
2475          * This is to avoid pushing to the exact same URL as the parent.
2476          */
2477         remote = pushremote_get(argv[1]);
2478         if (!remote || remote->origin == REMOTE_UNCONFIGURED)
2479                 die("remote '%s' not configured", argv[1]);
2480
2481         /* Check the refspec */
2482         if (argc > 2) {
2483                 int i;
2484                 struct ref *local_refs = get_local_heads();
2485                 struct refspec refspec = REFSPEC_INIT_PUSH;
2486
2487                 refspec_appendn(&refspec, argv + 2, argc - 2);
2488
2489                 for (i = 0; i < refspec.nr; i++) {
2490                         const struct refspec_item *rs = &refspec.items[i];
2491
2492                         if (rs->pattern || rs->matching)
2493                                 continue;
2494
2495                         /* LHS must match a single ref */
2496                         switch (count_refspec_match(rs->src, local_refs, NULL)) {
2497                         case 1:
2498                                 break;
2499                         case 0:
2500                                 /*
2501                                  * If LHS matches 'HEAD' then we need to ensure
2502                                  * that it matches the same named branch
2503                                  * checked out in the superproject.
2504                                  */
2505                                 if (!strcmp(rs->src, "HEAD")) {
2506                                         if (!detached_head &&
2507                                             !strcmp(head, superproject_head))
2508                                                 break;
2509                                         die("HEAD does not match the named branch in the superproject");
2510                                 }
2511                                 /* fallthrough */
2512                         default:
2513                                 die("src refspec '%s' must name a ref",
2514                                     rs->src);
2515                         }
2516                 }
2517                 refspec_clear(&refspec);
2518         }
2519         free(head);
2520
2521         return 0;
2522 }
2523
2524 static int ensure_core_worktree(int argc, const char **argv, const char *prefix)
2525 {
2526         const struct submodule *sub;
2527         const char *path;
2528         const char *cw;
2529         struct repository subrepo;
2530
2531         if (argc != 2)
2532                 BUG("submodule--helper ensure-core-worktree <path>");
2533
2534         path = argv[1];
2535
2536         sub = submodule_from_path(the_repository, &null_oid, path);
2537         if (!sub)
2538                 BUG("We could get the submodule handle before?");
2539
2540         if (repo_submodule_init(&subrepo, the_repository, sub))
2541                 die(_("could not get a repository handle for submodule '%s'"), path);
2542
2543         if (!repo_config_get_string_tmp(&subrepo, "core.worktree", &cw)) {
2544                 char *cfg_file, *abs_path;
2545                 const char *rel_path;
2546                 struct strbuf sb = STRBUF_INIT;
2547
2548                 cfg_file = repo_git_path(&subrepo, "config");
2549
2550                 abs_path = absolute_pathdup(path);
2551                 rel_path = relative_path(abs_path, subrepo.gitdir, &sb);
2552
2553                 git_config_set_in_file(cfg_file, "core.worktree", rel_path);
2554
2555                 free(cfg_file);
2556                 free(abs_path);
2557                 strbuf_release(&sb);
2558         }
2559
2560         return 0;
2561 }
2562
2563 static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
2564 {
2565         int i;
2566         struct pathspec pathspec;
2567         struct module_list list = MODULE_LIST_INIT;
2568         unsigned flags = ABSORB_GITDIR_RECURSE_SUBMODULES;
2569
2570         struct option embed_gitdir_options[] = {
2571                 OPT_STRING(0, "prefix", &prefix,
2572                            N_("path"),
2573                            N_("path into the working tree")),
2574                 OPT_BIT(0, "--recursive", &flags, N_("recurse into submodules"),
2575                         ABSORB_GITDIR_RECURSE_SUBMODULES),
2576                 OPT_END()
2577         };
2578
2579         const char *const git_submodule_helper_usage[] = {
2580                 N_("git submodule--helper absorb-git-dirs [<options>] [<path>...]"),
2581                 NULL
2582         };
2583
2584         argc = parse_options(argc, argv, prefix, embed_gitdir_options,
2585                              git_submodule_helper_usage, 0);
2586
2587         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
2588                 return 1;
2589
2590         for (i = 0; i < list.nr; i++)
2591                 absorb_git_dir_into_superproject(list.entries[i]->name, flags);
2592
2593         return 0;
2594 }
2595
2596 static int is_active(int argc, const char **argv, const char *prefix)
2597 {
2598         if (argc != 2)
2599                 die("submodule--helper is-active takes exactly 1 argument");
2600
2601         return !is_submodule_active(the_repository, argv[1]);
2602 }
2603
2604 /*
2605  * Exit non-zero if any of the submodule names given on the command line is
2606  * invalid. If no names are given, filter stdin to print only valid names
2607  * (which is primarily intended for testing).
2608  */
2609 static int check_name(int argc, const char **argv, const char *prefix)
2610 {
2611         if (argc > 1) {
2612                 while (*++argv) {
2613                         if (check_submodule_name(*argv) < 0)
2614                                 return 1;
2615                 }
2616         } else {
2617                 struct strbuf buf = STRBUF_INIT;
2618                 while (strbuf_getline(&buf, stdin) != EOF) {
2619                         if (!check_submodule_name(buf.buf))
2620                                 printf("%s\n", buf.buf);
2621                 }
2622                 strbuf_release(&buf);
2623         }
2624         return 0;
2625 }
2626
2627 static int module_config(int argc, const char **argv, const char *prefix)
2628 {
2629         enum {
2630                 CHECK_WRITEABLE = 1,
2631                 DO_UNSET = 2
2632         } command = 0;
2633
2634         struct option module_config_options[] = {
2635                 OPT_CMDMODE(0, "check-writeable", &command,
2636                             N_("check if it is safe to write to the .gitmodules file"),
2637                             CHECK_WRITEABLE),
2638                 OPT_CMDMODE(0, "unset", &command,
2639                             N_("unset the config in the .gitmodules file"),
2640                             DO_UNSET),
2641                 OPT_END()
2642         };
2643         const char *const git_submodule_helper_usage[] = {
2644                 N_("git submodule--helper config <name> [<value>]"),
2645                 N_("git submodule--helper config --unset <name>"),
2646                 N_("git submodule--helper config --check-writeable"),
2647                 NULL
2648         };
2649
2650         argc = parse_options(argc, argv, prefix, module_config_options,
2651                              git_submodule_helper_usage, PARSE_OPT_KEEP_ARGV0);
2652
2653         if (argc == 1 && command == CHECK_WRITEABLE)
2654                 return is_writing_gitmodules_ok() ? 0 : -1;
2655
2656         /* Equivalent to ACTION_GET in builtin/config.c */
2657         if (argc == 2 && command != DO_UNSET)
2658                 return print_config_from_gitmodules(the_repository, argv[1]);
2659
2660         /* Equivalent to ACTION_SET in builtin/config.c */
2661         if (argc == 3 || (argc == 2 && command == DO_UNSET)) {
2662                 const char *value = (argc == 3) ? argv[2] : NULL;
2663
2664                 if (!is_writing_gitmodules_ok())
2665                         die(_("please make sure that the .gitmodules file is in the working tree"));
2666
2667                 return config_set_in_gitmodules_file_gently(argv[1], value);
2668         }
2669
2670         usage_with_options(git_submodule_helper_usage, module_config_options);
2671 }
2672
2673 static int module_set_url(int argc, const char **argv, const char *prefix)
2674 {
2675         int quiet = 0;
2676         const char *newurl;
2677         const char *path;
2678         char *config_name;
2679
2680         struct option options[] = {
2681                 OPT__QUIET(&quiet, N_("suppress output for setting url of a submodule")),
2682                 OPT_END()
2683         };
2684         const char *const usage[] = {
2685                 N_("git submodule--helper set-url [--quiet] <path> <newurl>"),
2686                 NULL
2687         };
2688
2689         argc = parse_options(argc, argv, prefix, options, usage, 0);
2690
2691         if (argc != 2 || !(path = argv[0]) || !(newurl = argv[1]))
2692                 usage_with_options(usage, options);
2693
2694         config_name = xstrfmt("submodule.%s.url", path);
2695
2696         config_set_in_gitmodules_file_gently(config_name, newurl);
2697         sync_submodule(path, prefix, quiet ? OPT_QUIET : 0);
2698
2699         free(config_name);
2700
2701         return 0;
2702 }
2703
2704 static int module_set_branch(int argc, const char **argv, const char *prefix)
2705 {
2706         int opt_default = 0, ret;
2707         const char *opt_branch = NULL;
2708         const char *path;
2709         char *config_name;
2710
2711         /*
2712          * We accept the `quiet` option for uniformity across subcommands,
2713          * though there is nothing to make less verbose in this subcommand.
2714          */
2715         struct option options[] = {
2716                 OPT_NOOP_NOARG('q', "quiet"),
2717                 OPT_BOOL('d', "default", &opt_default,
2718                         N_("set the default tracking branch to master")),
2719                 OPT_STRING('b', "branch", &opt_branch, N_("branch"),
2720                         N_("set the default tracking branch")),
2721                 OPT_END()
2722         };
2723         const char *const usage[] = {
2724                 N_("git submodule--helper set-branch [-q|--quiet] (-d|--default) <path>"),
2725                 N_("git submodule--helper set-branch [-q|--quiet] (-b|--branch) <branch> <path>"),
2726                 NULL
2727         };
2728
2729         argc = parse_options(argc, argv, prefix, options, usage, 0);
2730
2731         if (!opt_branch && !opt_default)
2732                 die(_("--branch or --default required"));
2733
2734         if (opt_branch && opt_default)
2735                 die(_("--branch and --default are mutually exclusive"));
2736
2737         if (argc != 1 || !(path = argv[0]))
2738                 usage_with_options(usage, options);
2739
2740         config_name = xstrfmt("submodule.%s.branch", path);
2741         ret = config_set_in_gitmodules_file_gently(config_name, opt_branch);
2742
2743         free(config_name);
2744         return !!ret;
2745 }
2746
2747 #define SUPPORT_SUPER_PREFIX (1<<0)
2748
2749 struct cmd_struct {
2750         const char *cmd;
2751         int (*fn)(int, const char **, const char *);
2752         unsigned option;
2753 };
2754
2755 static struct cmd_struct commands[] = {
2756         {"list", module_list, 0},
2757         {"name", module_name, 0},
2758         {"clone", module_clone, 0},
2759         {"update-module-mode", module_update_module_mode, 0},
2760         {"update-clone", update_clone, 0},
2761         {"ensure-core-worktree", ensure_core_worktree, 0},
2762         {"relative-path", resolve_relative_path, 0},
2763         {"resolve-relative-url", resolve_relative_url, 0},
2764         {"resolve-relative-url-test", resolve_relative_url_test, 0},
2765         {"foreach", module_foreach, SUPPORT_SUPER_PREFIX},
2766         {"init", module_init, SUPPORT_SUPER_PREFIX},
2767         {"status", module_status, SUPPORT_SUPER_PREFIX},
2768         {"print-default-remote", print_default_remote, 0},
2769         {"sync", module_sync, SUPPORT_SUPER_PREFIX},
2770         {"deinit", module_deinit, 0},
2771         {"summary", module_summary, SUPPORT_SUPER_PREFIX},
2772         {"remote-branch", resolve_remote_submodule_branch, 0},
2773         {"push-check", push_check, 0},
2774         {"absorb-git-dirs", absorb_git_dirs, SUPPORT_SUPER_PREFIX},
2775         {"is-active", is_active, 0},
2776         {"check-name", check_name, 0},
2777         {"config", module_config, 0},
2778         {"set-url", module_set_url, 0},
2779         {"set-branch", module_set_branch, 0},
2780 };
2781
2782 int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
2783 {
2784         int i;
2785         if (argc < 2 || !strcmp(argv[1], "-h"))
2786                 usage("git submodule--helper <command>");
2787
2788         for (i = 0; i < ARRAY_SIZE(commands); i++) {
2789                 if (!strcmp(argv[1], commands[i].cmd)) {
2790                         if (get_super_prefix() &&
2791                             !(commands[i].option & SUPPORT_SUPER_PREFIX))
2792                                 die(_("%s doesn't support --super-prefix"),
2793                                     commands[i].cmd);
2794                         return commands[i].fn(argc - 1, argv + 1, prefix);
2795                 }
2796         }
2797
2798         die(_("'%s' is not a valid submodule--helper "
2799               "subcommand"), argv[1]);
2800 }