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                 argv_array_push(&cp.args, "describe");
 298                 argv_array_pushv(&cp.args, *d);
 299                 argv_array_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 cb_foreach {
 448         int argc;
 449         const char **argv;
 450         const char *prefix;
 451         int quiet;
 452         int recursive;
 453 };
 454 #define CB_FOREACH_INIT { 0 }
 455
 456 static void runcommand_in_submodule_cb(const struct cache_entry *list_item,
 457                                        void *cb_data)
 458 {
 459         struct cb_foreach *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                 argv_array_pushf(&cp.env_array, "name=%s", sub->name);
 499                 argv_array_pushf(&cp.env_array, "sm_path=%s", path);
 500                 argv_array_pushf(&cp.env_array, "displaypath=%s", displaypath);
 501                 argv_array_pushf(&cp.env_array, "sha1=%s",
 502                                 oid_to_hex(ce_oid));
 503                 argv_array_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 argv_array and not via env_array.
 513                  */
 514                 sq_quote_buf(&sb, path);
 515                 argv_array_pushf(&cp.args, "path=%s; %s",
 516                                  sb.buf, info->argv[0]);
 517                 strbuf_release(&sb);
 518                 free(toplevel);
 519         } else {
 520                 argv_array_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                 argv_array_pushl(&cpr.args, "--super-prefix", NULL);
 538                 argv_array_pushf(&cpr.args, "%s/", displaypath);
 539                 argv_array_pushl(&cpr.args, "submodule--helper", "foreach", "--recursive",
 540                                 NULL);
 541
 542                 if (info->quiet)
 543                         argv_array_push(&cpr.args, "--quiet");
 544
 545                 argv_array_push(&cpr.args, "--");
 546                 argv_array_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 cb_foreach info = CB_FOREACH_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
 616 #define INIT_CB_INIT { NULL, 0 }
 617
 618 static void init_submodule(const char *path, const char *prefix,
 619                            unsigned int flags)
 620 {
 621         const struct submodule *sub;
 622         struct strbuf sb = STRBUF_INIT;
 623         char *upd = NULL, *url = NULL, *displaypath;
 624
 625         displaypath = get_submodule_displaypath(path, prefix);
 626
 627         sub = submodule_from_path(the_repository, &null_oid, path);
 628
 629         if (!sub)
 630                 die(_("No url found for submodule path '%s' in .gitmodules"),
 631                         displaypath);
 632
 633         /*
 634          * NEEDSWORK: In a multi-working-tree world, this needs to be
 635          * set in the per-worktree config.
 636          *
 637          * Set active flag for the submodule being initialized
 638          */
 639         if (!is_submodule_active(the_repository, path)) {
 640                 strbuf_addf(&sb, "submodule.%s.active", sub->name);
 641                 git_config_set_gently(sb.buf, "true");
 642                 strbuf_reset(&sb);
 643         }
 644
 645         /*
 646          * Copy url setting when it is not set yet.
 647          * To look up the url in .git/config, we must not fall back to
 648          * .gitmodules, so look it up directly.
 649          */
 650         strbuf_addf(&sb, "submodule.%s.url", sub->name);
 651         if (git_config_get_string(sb.buf, &url)) {
 652                 if (!sub->url)
 653                         die(_("No url found for submodule path '%s' in .gitmodules"),
 654                                 displaypath);
 655
 656                 url = xstrdup(sub->url);
 657
 658                 /* Possibly a url relative to parent */
 659                 if (starts_with_dot_dot_slash(url) ||
 660                     starts_with_dot_slash(url)) {
 661                         char *oldurl = url;
 662                         url = compute_submodule_clone_url(oldurl);
 663                         free(oldurl);
 664                 }
 665
 666                 if (git_config_set_gently(sb.buf, url))
 667                         die(_("Failed to register url for submodule path '%s'"),
 668                             displaypath);
 669                 if (!(flags & OPT_QUIET))
 670                         fprintf(stderr,
 671                                 _("Submodule '%s' (%s) registered for path '%s'\n"),
 672                                 sub->name, url, displaypath);
 673         }
 674         strbuf_reset(&sb);
 675
 676         /* Copy "update" setting when it is not set yet */
 677         strbuf_addf(&sb, "submodule.%s.update", sub->name);
 678         if (git_config_get_string(sb.buf, &upd) &&
 679             sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
 680                 if (sub->update_strategy.type == SM_UPDATE_COMMAND) {
 681                         fprintf(stderr, _("warning: command update mode suggested for submodule '%s'\n"),
 682                                 sub->name);
 683                         upd = xstrdup("none");
 684                 } else
 685                         upd = xstrdup(submodule_strategy_to_string(&sub->update_strategy));
 686
 687                 if (git_config_set_gently(sb.buf, upd))
 688                         die(_("Failed to register update mode for submodule path '%s'"), displaypath);
 689         }
 690         strbuf_release(&sb);
 691         free(displaypath);
 692         free(url);
 693         free(upd);
 694 }
 695
 696 static void init_submodule_cb(const struct cache_entry *list_item, void *cb_data)
 697 {
 698         struct init_cb *info = cb_data;
 699         init_submodule(list_item->name, info->prefix, info->flags);
 700 }
 701
 702 static int module_init(int argc, const char **argv, const char *prefix)
 703 {
 704         struct init_cb info = INIT_CB_INIT;
 705         struct pathspec pathspec;
 706         struct module_list list = MODULE_LIST_INIT;
 707         int quiet = 0;
 708
 709         struct option module_init_options[] = {
 710                 OPT__QUIET(&quiet, N_("Suppress output for initializing a submodule")),
 711                 OPT_END()
 712         };
 713
 714         const char *const git_submodule_helper_usage[] = {
 715                 N_("git submodule--helper init [<options>] [<path>]"),
 716                 NULL
 717         };
 718
 719         argc = parse_options(argc, argv, prefix, module_init_options,
 720                              git_submodule_helper_usage, 0);
 721
 722         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 723                 return 1;
 724
 725         /*
 726          * If there are no path args and submodule.active is set then,
 727          * by default, only initialize 'active' modules.
 728          */
 729         if (!argc && git_config_get_value_multi("submodule.active"))
 730                 module_list_active(&list);
 731
 732         info.prefix = prefix;
 733         if (quiet)
 734                 info.flags |= OPT_QUIET;
 735
 736         for_each_listed_submodule(&list, init_submodule_cb, &info);
 737
 738         return 0;
 739 }
 740
 741 struct status_cb {
 742         const char *prefix;
 743         unsigned int flags;
 744 };
 745
 746 #define STATUS_CB_INIT { NULL, 0 }
 747
 748 static void print_status(unsigned int flags, char state, const char *path,
 749                          const struct object_id *oid, const char *displaypath)
 750 {
 751         if (flags & OPT_QUIET)
 752                 return;
 753
 754         printf("%c%s %s", state, oid_to_hex(oid), displaypath);
 755
 756         if (state == ' ' || state == '+') {
 757                 const char *name = compute_rev_name(path, oid_to_hex(oid));
 758
 759                 if (name)
 760                         printf(" (%s)", name);
 761         }
 762
 763         printf("\n");
 764 }
 765
 766 static int handle_submodule_head_ref(const char *refname,
 767                                      const struct object_id *oid, int flags,
 768                                      void *cb_data)
 769 {
 770         struct object_id *output = cb_data;
 771         if (oid)
 772                 oidcpy(output, oid);
 773
 774         return 0;
 775 }
 776
 777 static void status_submodule(const char *path, const struct object_id *ce_oid,
 778                              unsigned int ce_flags, const char *prefix,
 779                              unsigned int flags)
 780 {
 781         char *displaypath;
 782         struct argv_array diff_files_args = ARGV_ARRAY_INIT;
 783         struct rev_info rev;
 784         int diff_files_result;
 785         struct strbuf buf = STRBUF_INIT;
 786         const char *git_dir;
 787
 788         if (!submodule_from_path(the_repository, &null_oid, path))
 789                 die(_("no submodule mapping found in .gitmodules for path '%s'"),
 790                       path);
 791
 792         displaypath = get_submodule_displaypath(path, prefix);
 793
 794         if ((CE_STAGEMASK & ce_flags) >> CE_STAGESHIFT) {
 795                 print_status(flags, 'U', path, &null_oid, displaypath);
 796                 goto cleanup;
 797         }
 798
 799         strbuf_addf(&buf, "%s/.git", path);
 800         git_dir = read_gitfile(buf.buf);
 801         if (!git_dir)
 802                 git_dir = buf.buf;
 803
 804         if (!is_submodule_active(the_repository, path) ||
 805             !is_git_directory(git_dir)) {
 806                 print_status(flags, '-', path, ce_oid, displaypath);
 807                 strbuf_release(&buf);
 808                 goto cleanup;
 809         }
 810         strbuf_release(&buf);
 811
 812         argv_array_pushl(&diff_files_args, "diff-files",
 813                          "--ignore-submodules=dirty", "--quiet", "--",
 814                          path, NULL);
 815
 816         git_config(git_diff_basic_config, NULL);
 817
 818         repo_init_revisions(the_repository, &rev, NULL);
 819         rev.abbrev = 0;
 820         diff_files_args.argc = setup_revisions(diff_files_args.argc,
 821                                                diff_files_args.argv,
 822                                                &rev, NULL);
 823         diff_files_result = run_diff_files(&rev, 0);
 824
 825         if (!diff_result_code(&rev.diffopt, diff_files_result)) {
 826                 print_status(flags, ' ', path, ce_oid,
 827                              displaypath);
 828         } else if (!(flags & OPT_CACHED)) {
 829                 struct object_id oid;
 830                 struct ref_store *refs = get_submodule_ref_store(path);
 831
 832                 if (!refs) {
 833                         print_status(flags, '-', path, ce_oid, displaypath);
 834                         goto cleanup;
 835                 }
 836                 if (refs_head_ref(refs, handle_submodule_head_ref, &oid))
 837                         die(_("could not resolve HEAD ref inside the "
 838                               "submodule '%s'"), path);
 839
 840                 print_status(flags, '+', path, &oid, displaypath);
 841         } else {
 842                 print_status(flags, '+', path, ce_oid, displaypath);
 843         }
 844
 845         if (flags & OPT_RECURSIVE) {
 846                 struct child_process cpr = CHILD_PROCESS_INIT;
 847
 848                 cpr.git_cmd = 1;
 849                 cpr.dir = path;
 850                 prepare_submodule_repo_env(&cpr.env_array);
 851
 852                 argv_array_push(&cpr.args, "--super-prefix");
 853                 argv_array_pushf(&cpr.args, "%s/", displaypath);
 854                 argv_array_pushl(&cpr.args, "submodule--helper", "status",
 855                                  "--recursive", NULL);
 856
 857                 if (flags & OPT_CACHED)
 858                         argv_array_push(&cpr.args, "--cached");
 859
 860                 if (flags & OPT_QUIET)
 861                         argv_array_push(&cpr.args, "--quiet");
 862
 863                 if (run_command(&cpr))
 864                         die(_("failed to recurse into submodule '%s'"), path);
 865         }
 866
 867 cleanup:
 868         argv_array_clear(&diff_files_args);
 869         free(displaypath);
 870 }
 871
 872 static void status_submodule_cb(const struct cache_entry *list_item,
 873                                 void *cb_data)
 874 {
 875         struct status_cb *info = cb_data;
 876         status_submodule(list_item->name, &list_item->oid, list_item->ce_flags,
 877                          info->prefix, info->flags);
 878 }
 879
 880 static int module_status(int argc, const char **argv, const char *prefix)
 881 {
 882         struct status_cb info = STATUS_CB_INIT;
 883         struct pathspec pathspec;
 884         struct module_list list = MODULE_LIST_INIT;
 885         int quiet = 0;
 886
 887         struct option module_status_options[] = {
 888                 OPT__QUIET(&quiet, N_("Suppress submodule status output")),
 889                 OPT_BIT(0, "cached", &info.flags, N_("Use commit stored in the index instead of the one stored in the submodule HEAD"), OPT_CACHED),
 890                 OPT_BIT(0, "recursive", &info.flags, N_("recurse into nested submodules"), OPT_RECURSIVE),
 891                 OPT_END()
 892         };
 893
 894         const char *const git_submodule_helper_usage[] = {
 895                 N_("git submodule status [--quiet] [--cached] [--recursive] [<path>...]"),
 896                 NULL
 897         };
 898
 899         argc = parse_options(argc, argv, prefix, module_status_options,
 900                              git_submodule_helper_usage, 0);
 901
 902         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 903                 return 1;
 904
 905         info.prefix = prefix;
 906         if (quiet)
 907                 info.flags |= OPT_QUIET;
 908
 909         for_each_listed_submodule(&list, status_submodule_cb, &info);
 910
 911         return 0;
 912 }
 913
 914 static int module_name(int argc, const char **argv, const char *prefix)
 915 {
 916         const struct submodule *sub;
 917
 918         if (argc != 2)
 919                 usage(_("git submodule--helper name <path>"));
 920
 921         sub = submodule_from_path(the_repository, &null_oid, argv[1]);
 922
 923         if (!sub)
 924                 die(_("no submodule mapping found in .gitmodules for path '%s'"),
 925                     argv[1]);
 926
 927         printf("%s\n", sub->name);
 928
 929         return 0;
 930 }
 931
 932 struct sync_cb {
 933         const char *prefix;
 934         unsigned int flags;
 935 };
 936
 937 #define SYNC_CB_INIT { NULL, 0 }
 938
 939 static void sync_submodule(const char *path, const char *prefix,
 940                            unsigned int flags)
 941 {
 942         const struct submodule *sub;
 943         char *remote_key = NULL;
 944         char *sub_origin_url, *super_config_url, *displaypath;
 945         struct strbuf sb = STRBUF_INIT;
 946         struct child_process cp = CHILD_PROCESS_INIT;
 947         char *sub_config_path = NULL;
 948
 949         if (!is_submodule_active(the_repository, path))
 950                 return;
 951
 952         sub = submodule_from_path(the_repository, &null_oid, path);
 953
 954         if (sub && sub->url) {
 955                 if (starts_with_dot_dot_slash(sub->url) ||
 956                     starts_with_dot_slash(sub->url)) {
 957                         char *remote_url, *up_path;
 958                         char *remote = get_default_remote();
 959                         strbuf_addf(&sb, "remote.%s.url", remote);
 960
 961                         if (git_config_get_string(sb.buf, &remote_url))
 962                                 remote_url = xgetcwd();
 963
 964                         up_path = get_up_path(path);
 965                         sub_origin_url = relative_url(remote_url, sub->url, up_path);
 966                         super_config_url = relative_url(remote_url, sub->url, NULL);
 967
 968                         free(remote);
 969                         free(up_path);
 970                         free(remote_url);
 971                 } else {
 972                         sub_origin_url = xstrdup(sub->url);
 973                         super_config_url = xstrdup(sub->url);
 974                 }
 975         } else {
 976                 sub_origin_url = xstrdup("");
 977                 super_config_url = xstrdup("");
 978         }
 979
 980         displaypath = get_submodule_displaypath(path, prefix);
 981
 982         if (!(flags & OPT_QUIET))
 983                 printf(_("Synchronizing submodule url for '%s'\n"),
 984                          displaypath);
 985
 986         strbuf_reset(&sb);
 987         strbuf_addf(&sb, "submodule.%s.url", sub->name);
 988         if (git_config_set_gently(sb.buf, super_config_url))
 989                 die(_("failed to register url for submodule path '%s'"),
 990                       displaypath);
 991
 992         if (!is_submodule_populated_gently(path, NULL))
 993                 goto cleanup;
 994
 995         prepare_submodule_repo_env(&cp.env_array);
 996         cp.git_cmd = 1;
 997         cp.dir = path;
 998         argv_array_pushl(&cp.args, "submodule--helper",
 999                          "print-default-remote", NULL);
1000
1001         strbuf_reset(&sb);
1002         if (capture_command(&cp, &sb, 0))
1003                 die(_("failed to get the default remote for submodule '%s'"),
1004                       path);
1005
1006         strbuf_strip_suffix(&sb, "\n");
1007         remote_key = xstrfmt("remote.%s.url", sb.buf);
1008
1009         strbuf_reset(&sb);
1010         submodule_to_gitdir(&sb, path);
1011         strbuf_addstr(&sb, "/config");
1012
1013         if (git_config_set_in_file_gently(sb.buf, remote_key, sub_origin_url))
1014                 die(_("failed to update remote for submodule '%s'"),
1015                       path);
1016
1017         if (flags & OPT_RECURSIVE) {
1018                 struct child_process cpr = CHILD_PROCESS_INIT;
1019
1020                 cpr.git_cmd = 1;
1021                 cpr.dir = path;
1022                 prepare_submodule_repo_env(&cpr.env_array);
1023
1024                 argv_array_push(&cpr.args, "--super-prefix");
1025                 argv_array_pushf(&cpr.args, "%s/", displaypath);
1026                 argv_array_pushl(&cpr.args, "submodule--helper", "sync",
1027                                  "--recursive", NULL);
1028
1029                 if (flags & OPT_QUIET)
1030                         argv_array_push(&cpr.args, "--quiet");
1031
1032                 if (run_command(&cpr))
1033                         die(_("failed to recurse into submodule '%s'"),
1034                               path);
1035         }
1036
1037 cleanup:
1038         free(super_config_url);
1039         free(sub_origin_url);
1040         strbuf_release(&sb);
1041         free(remote_key);
1042         free(displaypath);
1043         free(sub_config_path);
1044 }
1045
1046 static void sync_submodule_cb(const struct cache_entry *list_item, void *cb_data)
1047 {
1048         struct sync_cb *info = cb_data;
1049         sync_submodule(list_item->name, info->prefix, info->flags);
1050 }
1051
1052 static int module_sync(int argc, const char **argv, const char *prefix)
1053 {
1054         struct sync_cb info = SYNC_CB_INIT;
1055         struct pathspec pathspec;
1056         struct module_list list = MODULE_LIST_INIT;
1057         int quiet = 0;
1058         int recursive = 0;
1059
1060         struct option module_sync_options[] = {
1061                 OPT__QUIET(&quiet, N_("Suppress output of synchronizing submodule url")),
1062                 OPT_BOOL(0, "recursive", &recursive,
1063                         N_("Recurse into nested submodules")),
1064                 OPT_END()
1065         };
1066
1067         const char *const git_submodule_helper_usage[] = {
1068                 N_("git submodule--helper sync [--quiet] [--recursive] [<path>]"),
1069                 NULL
1070         };
1071
1072         argc = parse_options(argc, argv, prefix, module_sync_options,
1073                              git_submodule_helper_usage, 0);
1074
1075         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1076                 return 1;
1077
1078         info.prefix = prefix;
1079         if (quiet)
1080                 info.flags |= OPT_QUIET;
1081         if (recursive)
1082                 info.flags |= OPT_RECURSIVE;
1083
1084         for_each_listed_submodule(&list, sync_submodule_cb, &info);
1085
1086         return 0;
1087 }
1088
1089 struct deinit_cb {
1090         const char *prefix;
1091         unsigned int flags;
1092 };
1093 #define DEINIT_CB_INIT { NULL, 0 }
1094
1095 static void deinit_submodule(const char *path, const char *prefix,
1096                              unsigned int flags)
1097 {
1098         const struct submodule *sub;
1099         char *displaypath = NULL;
1100         struct child_process cp_config = CHILD_PROCESS_INIT;
1101         struct strbuf sb_config = STRBUF_INIT;
1102         char *sub_git_dir = xstrfmt("%s/.git", path);
1103
1104         sub = submodule_from_path(the_repository, &null_oid, path);
1105
1106         if (!sub || !sub->name)
1107                 goto cleanup;
1108
1109         displaypath = get_submodule_displaypath(path, prefix);
1110
1111         /* remove the submodule work tree (unless the user already did it) */
1112         if (is_directory(path)) {
1113                 struct strbuf sb_rm = STRBUF_INIT;
1114                 const char *format;
1115
1116                 /*
1117                  * protect submodules containing a .git directory
1118                  * NEEDSWORK: instead of dying, automatically call
1119                  * absorbgitdirs and (possibly) warn.
1120                  */
1121                 if (is_directory(sub_git_dir))
1122                         die(_("Submodule work tree '%s' contains a .git "
1123                               "directory (use 'rm -rf' if you really want "
1124                               "to remove it including all of its history)"),
1125                             displaypath);
1126
1127                 if (!(flags & OPT_FORCE)) {
1128                         struct child_process cp_rm = CHILD_PROCESS_INIT;
1129                         cp_rm.git_cmd = 1;
1130                         argv_array_pushl(&cp_rm.args, "rm", "-qn",
1131                                          path, NULL);
1132
1133                         if (run_command(&cp_rm))
1134                                 die(_("Submodule work tree '%s' contains local "
1135                                       "modifications; use '-f' to discard them"),
1136                                       displaypath);
1137                 }
1138
1139                 strbuf_addstr(&sb_rm, path);
1140
1141                 if (!remove_dir_recursively(&sb_rm, 0))
1142                         format = _("Cleared directory '%s'\n");
1143                 else
1144                         format = _("Could not remove submodule work tree '%s'\n");
1145
1146                 if (!(flags & OPT_QUIET))
1147                         printf(format, displaypath);
1148
1149                 submodule_unset_core_worktree(sub);
1150
1151                 strbuf_release(&sb_rm);
1152         }
1153
1154         if (mkdir(path, 0777))
1155                 printf(_("could not create empty submodule directory %s"),
1156                       displaypath);
1157
1158         cp_config.git_cmd = 1;
1159         argv_array_pushl(&cp_config.args, "config", "--get-regexp", NULL);
1160         argv_array_pushf(&cp_config.args, "submodule.%s\\.", sub->name);
1161
1162         /* remove the .git/config entries (unless the user already did it) */
1163         if (!capture_command(&cp_config, &sb_config, 0) && sb_config.len) {
1164                 char *sub_key = xstrfmt("submodule.%s", sub->name);
1165                 /*
1166                  * remove the whole section so we have a clean state when
1167                  * the user later decides to init this submodule again
1168                  */
1169                 git_config_rename_section_in_file(NULL, sub_key, NULL);
1170                 if (!(flags & OPT_QUIET))
1171                         printf(_("Submodule '%s' (%s) unregistered for path '%s'\n"),
1172                                  sub->name, sub->url, displaypath);
1173                 free(sub_key);
1174         }
1175
1176 cleanup:
1177         free(displaypath);
1178         free(sub_git_dir);
1179         strbuf_release(&sb_config);
1180 }
1181
1182 static void deinit_submodule_cb(const struct cache_entry *list_item,
1183                                 void *cb_data)
1184 {
1185         struct deinit_cb *info = cb_data;
1186         deinit_submodule(list_item->name, info->prefix, info->flags);
1187 }
1188
1189 static int module_deinit(int argc, const char **argv, const char *prefix)
1190 {
1191         struct deinit_cb info = DEINIT_CB_INIT;
1192         struct pathspec pathspec;
1193         struct module_list list = MODULE_LIST_INIT;
1194         int quiet = 0;
1195         int force = 0;
1196         int all = 0;
1197
1198         struct option module_deinit_options[] = {
1199                 OPT__QUIET(&quiet, N_("Suppress submodule status output")),
1200                 OPT__FORCE(&force, N_("Remove submodule working trees even if they contain local changes"), 0),
1201                 OPT_BOOL(0, "all", &all, N_("Unregister all submodules")),
1202                 OPT_END()
1203         };
1204
1205         const char *const git_submodule_helper_usage[] = {
1206                 N_("git submodule deinit [--quiet] [-f | --force] [--all | [--] [<path>...]]"),
1207                 NULL
1208         };
1209
1210         argc = parse_options(argc, argv, prefix, module_deinit_options,
1211                              git_submodule_helper_usage, 0);
1212
1213         if (all && argc) {
1214                 error("pathspec and --all are incompatible");
1215                 usage_with_options(git_submodule_helper_usage,
1216                                    module_deinit_options);
1217         }
1218
1219         if (!argc && !all)
1220                 die(_("Use '--all' if you really want to deinitialize all submodules"));
1221
1222         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1223                 return 1;
1224
1225         info.prefix = prefix;
1226         if (quiet)
1227                 info.flags |= OPT_QUIET;
1228         if (force)
1229                 info.flags |= OPT_FORCE;
1230
1231         for_each_listed_submodule(&list, deinit_submodule_cb, &info);
1232
1233         return 0;
1234 }
1235
1236 static int clone_submodule(const char *path, const char *gitdir, const char *url,
1237                            const char *depth, struct string_list *reference, int dissociate,
1238                            int quiet, int progress, int single_branch)
1239 {
1240         struct child_process cp = CHILD_PROCESS_INIT;
1241
1242         argv_array_push(&cp.args, "clone");
1243         argv_array_push(&cp.args, "--no-checkout");
1244         if (quiet)
1245                 argv_array_push(&cp.args, "--quiet");
1246         if (progress)
1247                 argv_array_push(&cp.args, "--progress");
1248         if (depth && *depth)
1249                 argv_array_pushl(&cp.args, "--depth", depth, NULL);
1250         if (reference->nr) {
1251                 struct string_list_item *item;
1252                 for_each_string_list_item(item, reference)
1253                         argv_array_pushl(&cp.args, "--reference",
1254                                          item->string, NULL);
1255         }
1256         if (dissociate)
1257                 argv_array_push(&cp.args, "--dissociate");
1258         if (gitdir && *gitdir)
1259                 argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
1260         if (single_branch >= 0)
1261                 argv_array_push(&cp.args, single_branch ?
1262                                           "--single-branch" :
1263                                           "--no-single-branch");
1264
1265         argv_array_push(&cp.args, "--");
1266         argv_array_push(&cp.args, url);
1267         argv_array_push(&cp.args, path);
1268
1269         cp.git_cmd = 1;
1270         prepare_submodule_repo_env(&cp.env_array);
1271         cp.no_stdin = 1;
1272
1273         return run_command(&cp);
1274 }
1275
1276 struct submodule_alternate_setup {
1277         const char *submodule_name;
1278         enum SUBMODULE_ALTERNATE_ERROR_MODE {
1279                 SUBMODULE_ALTERNATE_ERROR_DIE,
1280                 SUBMODULE_ALTERNATE_ERROR_INFO,
1281                 SUBMODULE_ALTERNATE_ERROR_IGNORE
1282         } error_mode;
1283         struct string_list *reference;
1284 };
1285 #define SUBMODULE_ALTERNATE_SETUP_INIT { NULL, \
1286         SUBMODULE_ALTERNATE_ERROR_IGNORE, NULL }
1287
1288 static const char alternate_error_advice[] = N_(
1289 "An alternate computed from a superproject's alternate is invalid.\n"
1290 "To allow Git to clone without an alternate in such a case, set\n"
1291 "submodule.alternateErrorStrategy to 'info' or, equivalently, clone with\n"
1292 "'--reference-if-able' instead of '--reference'."
1293 );
1294
1295 static int add_possible_reference_from_superproject(
1296                 struct object_directory *odb, void *sas_cb)
1297 {
1298         struct submodule_alternate_setup *sas = sas_cb;
1299         size_t len;
1300
1301         /*
1302          * If the alternate object store is another repository, try the
1303          * standard layout with .git/(modules/<name>)+/objects
1304          */
1305         if (strip_suffix(odb->path, "/objects", &len)) {
1306                 char *sm_alternate;
1307                 struct strbuf sb = STRBUF_INIT;
1308                 struct strbuf err = STRBUF_INIT;
1309                 strbuf_add(&sb, odb->path, len);
1310
1311                 /*
1312                  * We need to end the new path with '/' to mark it as a dir,
1313                  * otherwise a submodule name containing '/' will be broken
1314                  * as the last part of a missing submodule reference would
1315                  * be taken as a file name.
1316                  */
1317                 strbuf_addf(&sb, "/modules/%s/", sas->submodule_name);
1318
1319                 sm_alternate = compute_alternate_path(sb.buf, &err);
1320                 if (sm_alternate) {
1321                         string_list_append(sas->reference, xstrdup(sb.buf));
1322                         free(sm_alternate);
1323                 } else {
1324                         switch (sas->error_mode) {
1325                         case SUBMODULE_ALTERNATE_ERROR_DIE:
1326                                 if (advice_submodule_alternate_error_strategy_die)
1327                                         advise(_(alternate_error_advice));
1328                                 die(_("submodule '%s' cannot add alternate: %s"),
1329                                     sas->submodule_name, err.buf);
1330                         case SUBMODULE_ALTERNATE_ERROR_INFO:
1331                                 fprintf_ln(stderr, _("submodule '%s' cannot add alternate: %s"),
1332                                         sas->submodule_name, err.buf);
1333                         case SUBMODULE_ALTERNATE_ERROR_IGNORE:
1334                                 ; /* nothing */
1335                         }
1336                 }
1337                 strbuf_release(&sb);
1338         }
1339
1340         return 0;
1341 }
1342
1343 static void prepare_possible_alternates(const char *sm_name,
1344                 struct string_list *reference)
1345 {
1346         char *sm_alternate = NULL, *error_strategy = NULL;
1347         struct submodule_alternate_setup sas = SUBMODULE_ALTERNATE_SETUP_INIT;
1348
1349         git_config_get_string("submodule.alternateLocation", &sm_alternate);
1350         if (!sm_alternate)
1351                 return;
1352
1353         git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
1354
1355         if (!error_strategy)
1356                 error_strategy = xstrdup("die");
1357
1358         sas.submodule_name = sm_name;
1359         sas.reference = reference;
1360         if (!strcmp(error_strategy, "die"))
1361                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_DIE;
1362         else if (!strcmp(error_strategy, "info"))
1363                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_INFO;
1364         else if (!strcmp(error_strategy, "ignore"))
1365                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_IGNORE;
1366         else
1367                 die(_("Value '%s' for submodule.alternateErrorStrategy is not recognized"), error_strategy);
1368
1369         if (!strcmp(sm_alternate, "superproject"))
1370                 foreach_alt_odb(add_possible_reference_from_superproject, &sas);
1371         else if (!strcmp(sm_alternate, "no"))
1372                 ; /* do nothing */
1373         else
1374                 die(_("Value '%s' for submodule.alternateLocation is not recognized"), sm_alternate);
1375
1376         free(sm_alternate);
1377         free(error_strategy);
1378 }
1379
1380 static int module_clone(int argc, const char **argv, const char *prefix)
1381 {
1382         const char *name = NULL, *url = NULL, *depth = NULL;
1383         int quiet = 0;
1384         int progress = 0;
1385         char *p, *path = NULL, *sm_gitdir;
1386         struct strbuf sb = STRBUF_INIT;
1387         struct string_list reference = STRING_LIST_INIT_NODUP;
1388         int dissociate = 0, require_init = 0;
1389         char *sm_alternate = NULL, *error_strategy = NULL;
1390         int single_branch = -1;
1391
1392         struct option module_clone_options[] = {
1393                 OPT_STRING(0, "prefix", &prefix,
1394                            N_("path"),
1395                            N_("alternative anchor for relative paths")),
1396                 OPT_STRING(0, "path", &path,
1397                            N_("path"),
1398                            N_("where the new submodule will be cloned to")),
1399                 OPT_STRING(0, "name", &name,
1400                            N_("string"),
1401                            N_("name of the new submodule")),
1402                 OPT_STRING(0, "url", &url,
1403                            N_("string"),
1404                            N_("url where to clone the submodule from")),
1405                 OPT_STRING_LIST(0, "reference", &reference,
1406                            N_("repo"),
1407                            N_("reference repository")),
1408                 OPT_BOOL(0, "dissociate", &dissociate,
1409                            N_("use --reference only while cloning")),
1410                 OPT_STRING(0, "depth", &depth,
1411                            N_("string"),
1412                            N_("depth for shallow clones")),
1413                 OPT__QUIET(&quiet, "Suppress output for cloning a submodule"),
1414                 OPT_BOOL(0, "progress", &progress,
1415                            N_("force cloning progress")),
1416                 OPT_BOOL(0, "require-init", &require_init,
1417                            N_("disallow cloning into non-empty directory")),
1418                 OPT_BOOL(0, "single-branch", &single_branch,
1419                          N_("clone only one branch, HEAD or --branch")),
1420                 OPT_END()
1421         };
1422
1423         const char *const git_submodule_helper_usage[] = {
1424                 N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
1425                    "[--reference <repository>] [--name <name>] [--depth <depth>] "
1426                    "[--single-branch] "
1427                    "--url <url> --path <path>"),
1428                 NULL
1429         };
1430
1431         argc = parse_options(argc, argv, prefix, module_clone_options,
1432                              git_submodule_helper_usage, 0);
1433
1434         if (argc || !url || !path || !*path)
1435                 usage_with_options(git_submodule_helper_usage,
1436                                    module_clone_options);
1437
1438         strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
1439         sm_gitdir = absolute_pathdup(sb.buf);
1440         strbuf_reset(&sb);
1441
1442         if (!is_absolute_path(path)) {
1443                 strbuf_addf(&sb, "%s/%s", get_git_work_tree(), path);
1444                 path = strbuf_detach(&sb, NULL);
1445         } else
1446                 path = xstrdup(path);
1447
1448         if (validate_submodule_git_dir(sm_gitdir, name) < 0)
1449                 die(_("refusing to create/use '%s' in another submodule's "
1450                         "git dir"), sm_gitdir);
1451
1452         if (!file_exists(sm_gitdir)) {
1453                 if (safe_create_leading_directories_const(sm_gitdir) < 0)
1454                         die(_("could not create directory '%s'"), sm_gitdir);
1455
1456                 prepare_possible_alternates(name, &reference);
1457
1458                 if (clone_submodule(path, sm_gitdir, url, depth, &reference, dissociate,
1459                                     quiet, progress, single_branch))
1460                         die(_("clone of '%s' into submodule path '%s' failed"),
1461                             url, path);
1462         } else {
1463                 if (require_init && !access(path, X_OK) && !is_empty_dir(path))
1464                         die(_("directory not empty: '%s'"), path);
1465                 if (safe_create_leading_directories_const(path) < 0)
1466                         die(_("could not create directory '%s'"), path);
1467                 strbuf_addf(&sb, "%s/index", sm_gitdir);
1468                 unlink_or_warn(sb.buf);
1469                 strbuf_reset(&sb);
1470         }
1471
1472         connect_work_tree_and_git_dir(path, sm_gitdir, 0);
1473
1474         p = git_pathdup_submodule(path, "config");
1475         if (!p)
1476                 die(_("could not get submodule directory for '%s'"), path);
1477
1478         /* setup alternateLocation and alternateErrorStrategy in the cloned submodule if needed */
1479         git_config_get_string("submodule.alternateLocation", &sm_alternate);
1480         if (sm_alternate)
1481                 git_config_set_in_file(p, "submodule.alternateLocation",
1482                                            sm_alternate);
1483         git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
1484         if (error_strategy)
1485                 git_config_set_in_file(p, "submodule.alternateErrorStrategy",
1486                                            error_strategy);
1487
1488         free(sm_alternate);
1489         free(error_strategy);
1490
1491         strbuf_release(&sb);
1492         free(sm_gitdir);
1493         free(path);
1494         free(p);
1495         return 0;
1496 }
1497
1498 static void determine_submodule_update_strategy(struct repository *r,
1499                                                 int just_cloned,
1500                                                 const char *path,
1501                                                 const char *update,
1502                                                 struct submodule_update_strategy *out)
1503 {
1504         const struct submodule *sub = submodule_from_path(r, &null_oid, path);
1505         char *key;
1506         const char *val;
1507
1508         key = xstrfmt("submodule.%s.update", sub->name);
1509
1510         if (update) {
1511                 if (parse_submodule_update_strategy(update, out) < 0)
1512                         die(_("Invalid update mode '%s' for submodule path '%s'"),
1513                                 update, path);
1514         } else if (!repo_config_get_string_const(r, key, &val)) {
1515                 if (parse_submodule_update_strategy(val, out) < 0)
1516                         die(_("Invalid update mode '%s' configured for submodule path '%s'"),
1517                                 val, path);
1518         } else if (sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
1519                 if (sub->update_strategy.type == SM_UPDATE_COMMAND)
1520                         BUG("how did we read update = !command from .gitmodules?");
1521                 out->type = sub->update_strategy.type;
1522                 out->command = sub->update_strategy.command;
1523         } else
1524                 out->type = SM_UPDATE_CHECKOUT;
1525
1526         if (just_cloned &&
1527             (out->type == SM_UPDATE_MERGE ||
1528              out->type == SM_UPDATE_REBASE ||
1529              out->type == SM_UPDATE_NONE))
1530                 out->type = SM_UPDATE_CHECKOUT;
1531
1532         free(key);
1533 }
1534
1535 static int module_update_module_mode(int argc, const char **argv, const char *prefix)
1536 {
1537         const char *path, *update = NULL;
1538         int just_cloned;
1539         struct submodule_update_strategy update_strategy = { .type = SM_UPDATE_CHECKOUT };
1540
1541         if (argc < 3 || argc > 4)
1542                 die("submodule--helper update-module-clone expects <just-cloned> <path> [<update>]");
1543
1544         just_cloned = git_config_int("just_cloned", argv[1]);
1545         path = argv[2];
1546
1547         if (argc == 4)
1548                 update = argv[3];
1549
1550         determine_submodule_update_strategy(the_repository,
1551                                             just_cloned, path, update,
1552                                             &update_strategy);
1553         fputs(submodule_strategy_to_string(&update_strategy), stdout);
1554
1555         return 0;
1556 }
1557
1558 struct update_clone_data {
1559         const struct submodule *sub;
1560         struct object_id oid;
1561         unsigned just_cloned;
1562 };
1563
1564 struct submodule_update_clone {
1565         /* index into 'list', the list of submodules to look into for cloning */
1566         int current;
1567         struct module_list list;
1568         unsigned warn_if_uninitialized : 1;
1569
1570         /* update parameter passed via commandline */
1571         struct submodule_update_strategy update;
1572
1573         /* configuration parameters which are passed on to the children */
1574         int progress;
1575         int quiet;
1576         int recommend_shallow;
1577         struct string_list references;
1578         int dissociate;
1579         unsigned require_init;
1580         const char *depth;
1581         const char *recursive_prefix;
1582         const char *prefix;
1583         int single_branch;
1584
1585         /* to be consumed by git-submodule.sh */
1586         struct update_clone_data *update_clone;
1587         int update_clone_nr; int update_clone_alloc;
1588
1589         /* If we want to stop as fast as possible and return an error */
1590         unsigned quickstop : 1;
1591
1592         /* failed clones to be retried again */
1593         const struct cache_entry **failed_clones;
1594         int failed_clones_nr, failed_clones_alloc;
1595
1596         int max_jobs;
1597 };
1598 #define SUBMODULE_UPDATE_CLONE_INIT { \
1599         .list = MODULE_LIST_INIT, \
1600         .update = SUBMODULE_UPDATE_STRATEGY_INIT, \
1601         .recommend_shallow = -1, \
1602         .references = STRING_LIST_INIT_DUP, \
1603         .single_branch = -1, \
1604         .max_jobs = 1, \
1605 }
1606
1607
1608 static void next_submodule_warn_missing(struct submodule_update_clone *suc,
1609                 struct strbuf *out, const char *displaypath)
1610 {
1611         /*
1612          * Only mention uninitialized submodules when their
1613          * paths have been specified.
1614          */
1615         if (suc->warn_if_uninitialized) {
1616                 strbuf_addf(out,
1617                         _("Submodule path '%s' not initialized"),
1618                         displaypath);
1619                 strbuf_addch(out, '\n');
1620                 strbuf_addstr(out,
1621                         _("Maybe you want to use 'update --init'?"));
1622                 strbuf_addch(out, '\n');
1623         }
1624 }
1625
1626 /**
1627  * Determine whether 'ce' needs to be cloned. If so, prepare the 'child' to
1628  * run the clone. Returns 1 if 'ce' needs to be cloned, 0 otherwise.
1629  */
1630 static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
1631                                            struct child_process *child,
1632                                            struct submodule_update_clone *suc,
1633                                            struct strbuf *out)
1634 {
1635         const struct submodule *sub = NULL;
1636         const char *url = NULL;
1637         const char *update_string;
1638         enum submodule_update_type update_type;
1639         char *key;
1640         struct strbuf displaypath_sb = STRBUF_INIT;
1641         struct strbuf sb = STRBUF_INIT;
1642         const char *displaypath = NULL;
1643         int needs_cloning = 0;
1644         int need_free_url = 0;
1645
1646         if (ce_stage(ce)) {
1647                 if (suc->recursive_prefix)
1648                         strbuf_addf(&sb, "%s/%s", suc->recursive_prefix, ce->name);
1649                 else
1650                         strbuf_addstr(&sb, ce->name);
1651                 strbuf_addf(out, _("Skipping unmerged submodule %s"), sb.buf);
1652                 strbuf_addch(out, '\n');
1653                 goto cleanup;
1654         }
1655
1656         sub = submodule_from_path(the_repository, &null_oid, ce->name);
1657
1658         if (suc->recursive_prefix)
1659                 displaypath = relative_path(suc->recursive_prefix,
1660                                             ce->name, &displaypath_sb);
1661         else
1662                 displaypath = ce->name;
1663
1664         if (!sub) {
1665                 next_submodule_warn_missing(suc, out, displaypath);
1666                 goto cleanup;
1667         }
1668
1669         key = xstrfmt("submodule.%s.update", sub->name);
1670         if (!repo_config_get_string_const(the_repository, key, &update_string)) {
1671                 update_type = parse_submodule_update_type(update_string);
1672         } else {
1673                 update_type = sub->update_strategy.type;
1674         }
1675         free(key);
1676
1677         if (suc->update.type == SM_UPDATE_NONE
1678             || (suc->update.type == SM_UPDATE_UNSPECIFIED
1679                 && update_type == SM_UPDATE_NONE)) {
1680                 strbuf_addf(out, _("Skipping submodule '%s'"), displaypath);
1681                 strbuf_addch(out, '\n');
1682                 goto cleanup;
1683         }
1684
1685         /* Check if the submodule has been initialized. */
1686         if (!is_submodule_active(the_repository, ce->name)) {
1687                 next_submodule_warn_missing(suc, out, displaypath);
1688                 goto cleanup;
1689         }
1690
1691         strbuf_reset(&sb);
1692         strbuf_addf(&sb, "submodule.%s.url", sub->name);
1693         if (repo_config_get_string_const(the_repository, sb.buf, &url)) {
1694                 if (starts_with_dot_slash(sub->url) ||
1695                     starts_with_dot_dot_slash(sub->url)) {
1696                         url = compute_submodule_clone_url(sub->url);
1697                         need_free_url = 1;
1698                 } else
1699                         url = sub->url;
1700         }
1701
1702         strbuf_reset(&sb);
1703         strbuf_addf(&sb, "%s/.git", ce->name);
1704         needs_cloning = !file_exists(sb.buf);
1705
1706         ALLOC_GROW(suc->update_clone, suc->update_clone_nr + 1,
1707                    suc->update_clone_alloc);
1708         oidcpy(&suc->update_clone[suc->update_clone_nr].oid, &ce->oid);
1709         suc->update_clone[suc->update_clone_nr].just_cloned = needs_cloning;
1710         suc->update_clone[suc->update_clone_nr].sub = sub;
1711         suc->update_clone_nr++;
1712
1713         if (!needs_cloning)
1714                 goto cleanup;
1715
1716         child->git_cmd = 1;
1717         child->no_stdin = 1;
1718         child->stdout_to_stderr = 1;
1719         child->err = -1;
1720         argv_array_push(&child->args, "submodule--helper");
1721         argv_array_push(&child->args, "clone");
1722         if (suc->progress)
1723                 argv_array_push(&child->args, "--progress");
1724         if (suc->quiet)
1725                 argv_array_push(&child->args, "--quiet");
1726         if (suc->prefix)
1727                 argv_array_pushl(&child->args, "--prefix", suc->prefix, NULL);
1728         if (suc->recommend_shallow && sub->recommend_shallow == 1)
1729                 argv_array_push(&child->args, "--depth=1");
1730         if (suc->require_init)
1731                 argv_array_push(&child->args, "--require-init");
1732         argv_array_pushl(&child->args, "--path", sub->path, NULL);
1733         argv_array_pushl(&child->args, "--name", sub->name, NULL);
1734         argv_array_pushl(&child->args, "--url", url, NULL);
1735         if (suc->references.nr) {
1736                 struct string_list_item *item;
1737                 for_each_string_list_item(item, &suc->references)
1738                         argv_array_pushl(&child->args, "--reference", item->string, NULL);
1739         }
1740         if (suc->dissociate)
1741                 argv_array_push(&child->args, "--dissociate");
1742         if (suc->depth)
1743                 argv_array_push(&child->args, suc->depth);
1744         if (suc->single_branch >= 0)
1745                 argv_array_push(&child->args, suc->single_branch ?
1746                                               "--single-branch" :
1747                                               "--no-single-branch");
1748
1749 cleanup:
1750         strbuf_reset(&displaypath_sb);
1751         strbuf_reset(&sb);
1752         if (need_free_url)
1753                 free((void*)url);
1754
1755         return needs_cloning;
1756 }
1757
1758 static int update_clone_get_next_task(struct child_process *child,
1759                                       struct strbuf *err,
1760                                       void *suc_cb,
1761                                       void **idx_task_cb)
1762 {
1763         struct submodule_update_clone *suc = suc_cb;
1764         const struct cache_entry *ce;
1765         int index;
1766
1767         for (; suc->current < suc->list.nr; suc->current++) {
1768                 ce = suc->list.entries[suc->current];
1769                 if (prepare_to_clone_next_submodule(ce, child, suc, err)) {
1770                         int *p = xmalloc(sizeof(*p));
1771                         *p = suc->current;
1772                         *idx_task_cb = p;
1773                         suc->current++;
1774                         return 1;
1775                 }
1776         }
1777
1778         /*
1779          * The loop above tried cloning each submodule once, now try the
1780          * stragglers again, which we can imagine as an extension of the
1781          * entry list.
1782          */
1783         index = suc->current - suc->list.nr;
1784         if (index < suc->failed_clones_nr) {
1785                 int *p;
1786                 ce = suc->failed_clones[index];
1787                 if (!prepare_to_clone_next_submodule(ce, child, suc, err)) {
1788                         suc->current ++;
1789                         strbuf_addstr(err, "BUG: submodule considered for "
1790                                            "cloning, doesn't need cloning "
1791                                            "any more?\n");
1792                         return 0;
1793                 }
1794                 p = xmalloc(sizeof(*p));
1795                 *p = suc->current;
1796                 *idx_task_cb = p;
1797                 suc->current ++;
1798                 return 1;
1799         }
1800
1801         return 0;
1802 }
1803
1804 static int update_clone_start_failure(struct strbuf *err,
1805                                       void *suc_cb,
1806                                       void *idx_task_cb)
1807 {
1808         struct submodule_update_clone *suc = suc_cb;
1809         suc->quickstop = 1;
1810         return 1;
1811 }
1812
1813 static int update_clone_task_finished(int result,
1814                                       struct strbuf *err,
1815                                       void *suc_cb,
1816                                       void *idx_task_cb)
1817 {
1818         const struct cache_entry *ce;
1819         struct submodule_update_clone *suc = suc_cb;
1820
1821         int *idxP = idx_task_cb;
1822         int idx = *idxP;
1823         free(idxP);
1824
1825         if (!result)
1826                 return 0;
1827
1828         if (idx < suc->list.nr) {
1829                 ce  = suc->list.entries[idx];
1830                 strbuf_addf(err, _("Failed to clone '%s'. Retry scheduled"),
1831                             ce->name);
1832                 strbuf_addch(err, '\n');
1833                 ALLOC_GROW(suc->failed_clones,
1834                            suc->failed_clones_nr + 1,
1835                            suc->failed_clones_alloc);
1836                 suc->failed_clones[suc->failed_clones_nr++] = ce;
1837                 return 0;
1838         } else {
1839                 idx -= suc->list.nr;
1840                 ce  = suc->failed_clones[idx];
1841                 strbuf_addf(err, _("Failed to clone '%s' a second time, aborting"),
1842                             ce->name);
1843                 strbuf_addch(err, '\n');
1844                 suc->quickstop = 1;
1845                 return 1;
1846         }
1847
1848         return 0;
1849 }
1850
1851 static int git_update_clone_config(const char *var, const char *value,
1852                                    void *cb)
1853 {
1854         int *max_jobs = cb;
1855         if (!strcmp(var, "submodule.fetchjobs"))
1856                 *max_jobs = parse_submodule_fetchjobs(var, value);
1857         return 0;
1858 }
1859
1860 static void update_submodule(struct update_clone_data *ucd)
1861 {
1862         fprintf(stdout, "dummy %s %d\t%s\n",
1863                 oid_to_hex(&ucd->oid),
1864                 ucd->just_cloned,
1865                 ucd->sub->path);
1866 }
1867
1868 static int update_submodules(struct submodule_update_clone *suc)
1869 {
1870         int i;
1871
1872         run_processes_parallel_tr2(suc->max_jobs, update_clone_get_next_task,
1873                                    update_clone_start_failure,
1874                                    update_clone_task_finished, suc, "submodule",
1875                                    "parallel/update");
1876
1877         /*
1878          * We saved the output and put it out all at once now.
1879          * That means:
1880          * - the listener does not have to interleave their (checkout)
1881          *   work with our fetching.  The writes involved in a
1882          *   checkout involve more straightforward sequential I/O.
1883          * - the listener can avoid doing any work if fetching failed.
1884          */
1885         if (suc->quickstop)
1886                 return 1;
1887
1888         for (i = 0; i < suc->update_clone_nr; i++)
1889                 update_submodule(&suc->update_clone[i]);
1890
1891         return 0;
1892 }
1893
1894 static int update_clone(int argc, const char **argv, const char *prefix)
1895 {
1896         const char *update = NULL;
1897         struct pathspec pathspec;
1898         struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
1899
1900         struct option module_update_clone_options[] = {
1901                 OPT_STRING(0, "prefix", &prefix,
1902                            N_("path"),
1903                            N_("path into the working tree")),
1904                 OPT_STRING(0, "recursive-prefix", &suc.recursive_prefix,
1905                            N_("path"),
1906                            N_("path into the working tree, across nested "
1907                               "submodule boundaries")),
1908                 OPT_STRING(0, "update", &update,
1909                            N_("string"),
1910                            N_("rebase, merge, checkout or none")),
1911                 OPT_STRING_LIST(0, "reference", &suc.references, N_("repo"),
1912                            N_("reference repository")),
1913                 OPT_BOOL(0, "dissociate", &suc.dissociate,
1914                            N_("use --reference only while cloning")),
1915                 OPT_STRING(0, "depth", &suc.depth, "<depth>",
1916                            N_("Create a shallow clone truncated to the "
1917                               "specified number of revisions")),
1918                 OPT_INTEGER('j', "jobs", &suc.max_jobs,
1919                             N_("parallel jobs")),
1920                 OPT_BOOL(0, "recommend-shallow", &suc.recommend_shallow,
1921                             N_("whether the initial clone should follow the shallow recommendation")),
1922                 OPT__QUIET(&suc.quiet, N_("don't print cloning progress")),
1923                 OPT_BOOL(0, "progress", &suc.progress,
1924                             N_("force cloning progress")),
1925                 OPT_BOOL(0, "require-init", &suc.require_init,
1926                            N_("disallow cloning into non-empty directory")),
1927                 OPT_BOOL(0, "single-branch", &suc.single_branch,
1928                          N_("clone only one branch, HEAD or --branch")),
1929                 OPT_END()
1930         };
1931
1932         const char *const git_submodule_helper_usage[] = {
1933                 N_("git submodule--helper update-clone [--prefix=<path>] [<path>...]"),
1934                 NULL
1935         };
1936         suc.prefix = prefix;
1937
1938         update_clone_config_from_gitmodules(&suc.max_jobs);
1939         git_config(git_update_clone_config, &suc.max_jobs);
1940
1941         argc = parse_options(argc, argv, prefix, module_update_clone_options,
1942                              git_submodule_helper_usage, 0);
1943
1944         if (update)
1945                 if (parse_submodule_update_strategy(update, &suc.update) < 0)
1946                         die(_("bad value for update parameter"));
1947
1948         if (module_list_compute(argc, argv, prefix, &pathspec, &suc.list) < 0)
1949                 return 1;
1950
1951         if (pathspec.nr)
1952                 suc.warn_if_uninitialized = 1;
1953
1954         return update_submodules(&suc);
1955 }
1956
1957 static int resolve_relative_path(int argc, const char **argv, const char *prefix)
1958 {
1959         struct strbuf sb = STRBUF_INIT;
1960         if (argc != 3)
1961                 die("submodule--helper relative-path takes exactly 2 arguments, got %d", argc);
1962
1963         printf("%s", relative_path(argv[1], argv[2], &sb));
1964         strbuf_release(&sb);
1965         return 0;
1966 }
1967
1968 static const char *remote_submodule_branch(const char *path)
1969 {
1970         const struct submodule *sub;
1971         const char *branch = NULL;
1972         char *key;
1973
1974         sub = submodule_from_path(the_repository, &null_oid, path);
1975         if (!sub)
1976                 return NULL;
1977
1978         key = xstrfmt("submodule.%s.branch", sub->name);
1979         if (repo_config_get_string_const(the_repository, key, &branch))
1980                 branch = sub->branch;
1981         free(key);
1982
1983         if (!branch)
1984                 return "master";
1985
1986         if (!strcmp(branch, ".")) {
1987                 const char *refname = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
1988
1989                 if (!refname)
1990                         die(_("No such ref: %s"), "HEAD");
1991
1992                 /* detached HEAD */
1993                 if (!strcmp(refname, "HEAD"))
1994                         die(_("Submodule (%s) branch configured to inherit "
1995                               "branch from superproject, but the superproject "
1996                               "is not on any branch"), sub->name);
1997
1998                 if (!skip_prefix(refname, "refs/heads/", &refname))
1999                         die(_("Expecting a full ref name, got %s"), refname);
2000                 return refname;
2001         }
2002
2003         return branch;
2004 }
2005
2006 static int resolve_remote_submodule_branch(int argc, const char **argv,
2007                 const char *prefix)
2008 {
2009         const char *ret;
2010         struct strbuf sb = STRBUF_INIT;
2011         if (argc != 2)
2012                 die("submodule--helper remote-branch takes exactly one arguments, got %d", argc);
2013
2014         ret = remote_submodule_branch(argv[1]);
2015         if (!ret)
2016                 die("submodule %s doesn't exist", argv[1]);
2017
2018         printf("%s", ret);
2019         strbuf_release(&sb);
2020         return 0;
2021 }
2022
2023 static int push_check(int argc, const char **argv, const char *prefix)
2024 {
2025         struct remote *remote;
2026         const char *superproject_head;
2027         char *head;
2028         int detached_head = 0;
2029         struct object_id head_oid;
2030
2031         if (argc < 3)
2032                 die("submodule--helper push-check requires at least 2 arguments");
2033
2034         /*
2035          * superproject's resolved head ref.
2036          * if HEAD then the superproject is in a detached head state, otherwise
2037          * it will be the resolved head ref.
2038          */
2039         superproject_head = argv[1];
2040         argv++;
2041         argc--;
2042         /* Get the submodule's head ref and determine if it is detached */
2043         head = resolve_refdup("HEAD", 0, &head_oid, NULL);
2044         if (!head)
2045                 die(_("Failed to resolve HEAD as a valid ref."));
2046         if (!strcmp(head, "HEAD"))
2047                 detached_head = 1;
2048
2049         /*
2050          * The remote must be configured.
2051          * This is to avoid pushing to the exact same URL as the parent.
2052          */
2053         remote = pushremote_get(argv[1]);
2054         if (!remote || remote->origin == REMOTE_UNCONFIGURED)
2055                 die("remote '%s' not configured", argv[1]);
2056
2057         /* Check the refspec */
2058         if (argc > 2) {
2059                 int i;
2060                 struct ref *local_refs = get_local_heads();
2061                 struct refspec refspec = REFSPEC_INIT_PUSH;
2062
2063                 refspec_appendn(&refspec, argv + 2, argc - 2);
2064
2065                 for (i = 0; i < refspec.nr; i++) {
2066                         const struct refspec_item *rs = &refspec.items[i];
2067
2068                         if (rs->pattern || rs->matching)
2069                                 continue;
2070
2071                         /* LHS must match a single ref */
2072                         switch (count_refspec_match(rs->src, local_refs, NULL)) {
2073                         case 1:
2074                                 break;
2075                         case 0:
2076                                 /*
2077                                  * If LHS matches 'HEAD' then we need to ensure
2078                                  * that it matches the same named branch
2079                                  * checked out in the superproject.
2080                                  */
2081                                 if (!strcmp(rs->src, "HEAD")) {
2082                                         if (!detached_head &&
2083                                             !strcmp(head, superproject_head))
2084                                                 break;
2085                                         die("HEAD does not match the named branch in the superproject");
2086                                 }
2087                                 /* fallthrough */
2088                         default:
2089                                 die("src refspec '%s' must name a ref",
2090                                     rs->src);
2091                         }
2092                 }
2093                 refspec_clear(&refspec);
2094         }
2095         free(head);
2096
2097         return 0;
2098 }
2099
2100 static int ensure_core_worktree(int argc, const char **argv, const char *prefix)
2101 {
2102         const struct submodule *sub;
2103         const char *path;
2104         char *cw;
2105         struct repository subrepo;
2106
2107         if (argc != 2)
2108                 BUG("submodule--helper ensure-core-worktree <path>");
2109
2110         path = argv[1];
2111
2112         sub = submodule_from_path(the_repository, &null_oid, path);
2113         if (!sub)
2114                 BUG("We could get the submodule handle before?");
2115
2116         if (repo_submodule_init(&subrepo, the_repository, sub))
2117                 die(_("could not get a repository handle for submodule '%s'"), path);
2118
2119         if (!repo_config_get_string(&subrepo, "core.worktree", &cw)) {
2120                 char *cfg_file, *abs_path;
2121                 const char *rel_path;
2122                 struct strbuf sb = STRBUF_INIT;
2123
2124                 cfg_file = repo_git_path(&subrepo, "config");
2125
2126                 abs_path = absolute_pathdup(path);
2127                 rel_path = relative_path(abs_path, subrepo.gitdir, &sb);
2128
2129                 git_config_set_in_file(cfg_file, "core.worktree", rel_path);
2130
2131                 free(cfg_file);
2132                 free(abs_path);
2133                 strbuf_release(&sb);
2134         }
2135
2136         return 0;
2137 }
2138
2139 static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
2140 {
2141         int i;
2142         struct pathspec pathspec;
2143         struct module_list list = MODULE_LIST_INIT;
2144         unsigned flags = ABSORB_GITDIR_RECURSE_SUBMODULES;
2145
2146         struct option embed_gitdir_options[] = {
2147                 OPT_STRING(0, "prefix", &prefix,
2148                            N_("path"),
2149                            N_("path into the working tree")),
2150                 OPT_BIT(0, "--recursive", &flags, N_("recurse into submodules"),
2151                         ABSORB_GITDIR_RECURSE_SUBMODULES),
2152                 OPT_END()
2153         };
2154
2155         const char *const git_submodule_helper_usage[] = {
2156                 N_("git submodule--helper absorb-git-dirs [<options>] [<path>...]"),
2157                 NULL
2158         };
2159
2160         argc = parse_options(argc, argv, prefix, embed_gitdir_options,
2161                              git_submodule_helper_usage, 0);
2162
2163         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
2164                 return 1;
2165
2166         for (i = 0; i < list.nr; i++)
2167                 absorb_git_dir_into_superproject(list.entries[i]->name, flags);
2168
2169         return 0;
2170 }
2171
2172 static int is_active(int argc, const char **argv, const char *prefix)
2173 {
2174         if (argc != 2)
2175                 die("submodule--helper is-active takes exactly 1 argument");
2176
2177         return !is_submodule_active(the_repository, argv[1]);
2178 }
2179
2180 /*
2181  * Exit non-zero if any of the submodule names given on the command line is
2182  * invalid. If no names are given, filter stdin to print only valid names
2183  * (which is primarily intended for testing).
2184  */
2185 static int check_name(int argc, const char **argv, const char *prefix)
2186 {
2187         if (argc > 1) {
2188                 while (*++argv) {
2189                         if (check_submodule_name(*argv) < 0)
2190                                 return 1;
2191                 }
2192         } else {
2193                 struct strbuf buf = STRBUF_INIT;
2194                 while (strbuf_getline(&buf, stdin) != EOF) {
2195                         if (!check_submodule_name(buf.buf))
2196                                 printf("%s\n", buf.buf);
2197                 }
2198                 strbuf_release(&buf);
2199         }
2200         return 0;
2201 }
2202
2203 static int module_config(int argc, const char **argv, const char *prefix)
2204 {
2205         enum {
2206                 CHECK_WRITEABLE = 1,
2207                 DO_UNSET = 2
2208         } command = 0;
2209
2210         struct option module_config_options[] = {
2211                 OPT_CMDMODE(0, "check-writeable", &command,
2212                             N_("check if it is safe to write to the .gitmodules file"),
2213                             CHECK_WRITEABLE),
2214                 OPT_CMDMODE(0, "unset", &command,
2215                             N_("unset the config in the .gitmodules file"),
2216                             DO_UNSET),
2217                 OPT_END()
2218         };
2219         const char *const git_submodule_helper_usage[] = {
2220                 N_("git submodule--helper config <name> [<value>]"),
2221                 N_("git submodule--helper config --unset <name>"),
2222                 N_("git submodule--helper config --check-writeable"),
2223                 NULL
2224         };
2225
2226         argc = parse_options(argc, argv, prefix, module_config_options,
2227                              git_submodule_helper_usage, PARSE_OPT_KEEP_ARGV0);
2228
2229         if (argc == 1 && command == CHECK_WRITEABLE)
2230                 return is_writing_gitmodules_ok() ? 0 : -1;
2231
2232         /* Equivalent to ACTION_GET in builtin/config.c */
2233         if (argc == 2 && command != DO_UNSET)
2234                 return print_config_from_gitmodules(the_repository, argv[1]);
2235
2236         /* Equivalent to ACTION_SET in builtin/config.c */
2237         if (argc == 3 || (argc == 2 && command == DO_UNSET)) {
2238                 const char *value = (argc == 3) ? argv[2] : NULL;
2239
2240                 if (!is_writing_gitmodules_ok())
2241                         die(_("please make sure that the .gitmodules file is in the working tree"));
2242
2243                 return config_set_in_gitmodules_file_gently(argv[1], value);
2244         }
2245
2246         usage_with_options(git_submodule_helper_usage, module_config_options);
2247 }
2248
2249 #define SUPPORT_SUPER_PREFIX (1<<0)
2250
2251 struct cmd_struct {
2252         const char *cmd;
2253         int (*fn)(int, const char **, const char *);
2254         unsigned option;
2255 };
2256
2257 static struct cmd_struct commands[] = {
2258         {"list", module_list, 0},
2259         {"name", module_name, 0},
2260         {"clone", module_clone, 0},
2261         {"update-module-mode", module_update_module_mode, 0},
2262         {"update-clone", update_clone, 0},
2263         {"ensure-core-worktree", ensure_core_worktree, 0},
2264         {"relative-path", resolve_relative_path, 0},
2265         {"resolve-relative-url", resolve_relative_url, 0},
2266         {"resolve-relative-url-test", resolve_relative_url_test, 0},
2267         {"foreach", module_foreach, SUPPORT_SUPER_PREFIX},
2268         {"init", module_init, SUPPORT_SUPER_PREFIX},
2269         {"status", module_status, SUPPORT_SUPER_PREFIX},
2270         {"print-default-remote", print_default_remote, 0},
2271         {"sync", module_sync, SUPPORT_SUPER_PREFIX},
2272         {"deinit", module_deinit, 0},
2273         {"remote-branch", resolve_remote_submodule_branch, 0},
2274         {"push-check", push_check, 0},
2275         {"absorb-git-dirs", absorb_git_dirs, SUPPORT_SUPER_PREFIX},
2276         {"is-active", is_active, 0},
2277         {"check-name", check_name, 0},
2278         {"config", module_config, 0},
2279 };
2280
2281 int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
2282 {
2283         int i;
2284         if (argc < 2 || !strcmp(argv[1], "-h"))
2285                 usage("git submodule--helper <command>");
2286
2287         for (i = 0; i < ARRAY_SIZE(commands); i++) {
2288                 if (!strcmp(argv[1], commands[i].cmd)) {
2289                         if (get_super_prefix() &&
2290                             !(commands[i].option & SUPPORT_SUPER_PREFIX))
2291                                 die(_("%s doesn't support --super-prefix"),
2292                                     commands[i].cmd);
2293                         return commands[i].fn(argc - 1, argv + 1, prefix);
2294                 }
2295         }
2296
2297         die(_("'%s' is not a valid submodule--helper "
2298               "subcommand"), argv[1]);
2299 }