builtin/submodule--helper.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "parse-options.h"
   4 #include "quote.h"
   5 #include "pathspec.h"
   6 #include "dir.h"
   7 #include "utf8.h"
   8 #include "submodule.h"
   9 #include "submodule-config.h"
  10 #include "string-list.h"
  11 #include "run-command.h"
  12 #include "remote.h"
  13 #include "refs.h"
  14 #include "connect.h"
  15
  16 static char *get_default_remote(void)
  17 {
  18         char *dest = NULL, *ret;
  19         unsigned char sha1[20];
  20         struct strbuf sb = STRBUF_INIT;
  21         const char *refname = resolve_ref_unsafe("HEAD", 0, sha1, NULL);
  22
  23         if (!refname)
  24                 die(_("No such ref: %s"), "HEAD");
  25
  26         /* detached HEAD */
  27         if (!strcmp(refname, "HEAD"))
  28                 return xstrdup("origin");
  29
  30         if (!skip_prefix(refname, "refs/heads/", &refname))
  31                 die(_("Expecting a full ref name, got %s"), refname);
  32
  33         strbuf_addf(&sb, "branch.%s.remote", refname);
  34         if (git_config_get_string(sb.buf, &dest))
  35                 ret = xstrdup("origin");
  36         else
  37                 ret = dest;
  38
  39         strbuf_release(&sb);
  40         return ret;
  41 }
  42
  43 static int starts_with_dot_slash(const char *str)
  44 {
  45         return str[0] == '.' && is_dir_sep(str[1]);
  46 }
  47
  48 static int starts_with_dot_dot_slash(const char *str)
  49 {
  50         return str[0] == '.' && str[1] == '.' && is_dir_sep(str[2]);
  51 }
  52
  53 /*
  54  * Returns 1 if it was the last chop before ':'.
  55  */
  56 static int chop_last_dir(char **remoteurl, int is_relative)
  57 {
  58         char *rfind = find_last_dir_sep(*remoteurl);
  59         if (rfind) {
  60                 *rfind = '\0';
  61                 return 0;
  62         }
  63
  64         rfind = strrchr(*remoteurl, ':');
  65         if (rfind) {
  66                 *rfind = '\0';
  67                 return 1;
  68         }
  69
  70         if (is_relative || !strcmp(".", *remoteurl))
  71                 die(_("cannot strip one component off url '%s'"),
  72                         *remoteurl);
  73
  74         free(*remoteurl);
  75         *remoteurl = xstrdup(".");
  76         return 0;
  77 }
  78
  79 /*
  80  * The `url` argument is the URL that navigates to the submodule origin
  81  * repo. When relative, this URL is relative to the superproject origin
  82  * URL repo. The `up_path` argument, if specified, is the relative
  83  * path that navigates from the submodule working tree to the superproject
  84  * working tree. Returns the origin URL of the submodule.
  85  *
  86  * Return either an absolute URL or filesystem path (if the superproject
  87  * origin URL is an absolute URL or filesystem path, respectively) or a
  88  * relative file system path (if the superproject origin URL is a relative
  89  * file system path).
  90  *
  91  * When the output is a relative file system path, the path is either
  92  * relative to the submodule working tree, if up_path is specified, or to
  93  * the superproject working tree otherwise.
  94  *
  95  * NEEDSWORK: This works incorrectly on the domain and protocol part.
  96  * remote_url      url              outcome          expectation
  97  * http://a.com/b  ../c             http://a.com/c   as is
  98  * http://a.com/b/ ../c             http://a.com/c   same as previous line, but
  99  *                                                   ignore trailing slash in url
 100  * http://a.com/b  ../../c          http://c         error out
 101  * http://a.com/b  ../../../c       http:/c          error out
 102  * http://a.com/b  ../../../../c    http:c           error out
 103  * http://a.com/b  ../../../../../c    .:c           error out
 104  * NEEDSWORK: Given how chop_last_dir() works, this function is broken
 105  * when a local part has a colon in its path component, too.
 106  */
 107 static char *relative_url(const char *remote_url,
 108                                 const char *url,
 109                                 const char *up_path)
 110 {
 111         int is_relative = 0;
 112         int colonsep = 0;
 113         char *out;
 114         char *remoteurl = xstrdup(remote_url);
 115         struct strbuf sb = STRBUF_INIT;
 116         size_t len = strlen(remoteurl);
 117
 118         if (is_dir_sep(remoteurl[len-1]))
 119                 remoteurl[len-1] = '\0';
 120
 121         if (!url_is_local_not_ssh(remoteurl) || is_absolute_path(remoteurl))
 122                 is_relative = 0;
 123         else {
 124                 is_relative = 1;
 125                 /*
 126                  * Prepend a './' to ensure all relative
 127                  * remoteurls start with './' or '../'
 128                  */
 129                 if (!starts_with_dot_slash(remoteurl) &&
 130                     !starts_with_dot_dot_slash(remoteurl)) {
 131                         strbuf_reset(&sb);
 132                         strbuf_addf(&sb, "./%s", remoteurl);
 133                         free(remoteurl);
 134                         remoteurl = strbuf_detach(&sb, NULL);
 135                 }
 136         }
 137         /*
 138          * When the url starts with '../', remove that and the
 139          * last directory in remoteurl.
 140          */
 141         while (url) {
 142                 if (starts_with_dot_dot_slash(url)) {
 143                         url += 3;
 144                         colonsep |= chop_last_dir(&remoteurl, is_relative);
 145                 } else if (starts_with_dot_slash(url))
 146                         url += 2;
 147                 else
 148                         break;
 149         }
 150         strbuf_reset(&sb);
 151         strbuf_addf(&sb, "%s%s%s", remoteurl, colonsep ? ":" : "/", url);
 152         if (ends_with(url, "/"))
 153                 strbuf_setlen(&sb, sb.len - 1);
 154         free(remoteurl);
 155
 156         if (starts_with_dot_slash(sb.buf))
 157                 out = xstrdup(sb.buf + 2);
 158         else
 159                 out = xstrdup(sb.buf);
 160         strbuf_reset(&sb);
 161
 162         if (!up_path || !is_relative)
 163                 return out;
 164
 165         strbuf_addf(&sb, "%s%s", up_path, out);
 166         free(out);
 167         return strbuf_detach(&sb, NULL);
 168 }
 169
 170 static int resolve_relative_url(int argc, const char **argv, const char *prefix)
 171 {
 172         char *remoteurl = NULL;
 173         char *remote = get_default_remote();
 174         const char *up_path = NULL;
 175         char *res;
 176         const char *url;
 177         struct strbuf sb = STRBUF_INIT;
 178
 179         if (argc != 2 && argc != 3)
 180                 die("resolve-relative-url only accepts one or two arguments");
 181
 182         url = argv[1];
 183         strbuf_addf(&sb, "remote.%s.url", remote);
 184         free(remote);
 185
 186         if (git_config_get_string(sb.buf, &remoteurl))
 187                 /* the repository is its own authoritative upstream */
 188                 remoteurl = xgetcwd();
 189
 190         if (argc == 3)
 191                 up_path = argv[2];
 192
 193         res = relative_url(remoteurl, url, up_path);
 194         puts(res);
 195         free(res);
 196         free(remoteurl);
 197         return 0;
 198 }
 199
 200 static int resolve_relative_url_test(int argc, const char **argv, const char *prefix)
 201 {
 202         char *remoteurl, *res;
 203         const char *up_path, *url;
 204
 205         if (argc != 4)
 206                 die("resolve-relative-url-test only accepts three arguments: <up_path> <remoteurl> <url>");
 207
 208         up_path = argv[1];
 209         remoteurl = xstrdup(argv[2]);
 210         url = argv[3];
 211
 212         if (!strcmp(up_path, "(null)"))
 213                 up_path = NULL;
 214
 215         res = relative_url(remoteurl, url, up_path);
 216         puts(res);
 217         free(res);
 218         free(remoteurl);
 219         return 0;
 220 }
 221
 222 struct module_list {
 223         const struct cache_entry **entries;
 224         int alloc, nr;
 225 };
 226 #define MODULE_LIST_INIT { NULL, 0, 0 }
 227
 228 static int module_list_compute(int argc, const char **argv,
 229                                const char *prefix,
 230                                struct pathspec *pathspec,
 231                                struct module_list *list)
 232 {
 233         int i, result = 0;
 234         char *ps_matched = NULL;
 235         parse_pathspec(pathspec, 0,
 236                        PATHSPEC_PREFER_FULL |
 237                        PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP,
 238                        prefix, argv);
 239
 240         if (pathspec->nr)
 241                 ps_matched = xcalloc(pathspec->nr, 1);
 242
 243         if (read_cache() < 0)
 244                 die(_("index file corrupt"));
 245
 246         for (i = 0; i < active_nr; i++) {
 247                 const struct cache_entry *ce = active_cache[i];
 248
 249                 if (!match_pathspec(pathspec, ce->name, ce_namelen(ce),
 250                                     0, ps_matched, 1) ||
 251                     !S_ISGITLINK(ce->ce_mode))
 252                         continue;
 253
 254                 ALLOC_GROW(list->entries, list->nr + 1, list->alloc);
 255                 list->entries[list->nr++] = ce;
 256                 while (i + 1 < active_nr &&
 257                        !strcmp(ce->name, active_cache[i + 1]->name))
 258                         /*
 259                          * Skip entries with the same name in different stages
 260                          * to make sure an entry is returned only once.
 261                          */
 262                         i++;
 263         }
 264
 265         if (ps_matched && report_path_error(ps_matched, pathspec, prefix))
 266                 result = -1;
 267
 268         free(ps_matched);
 269
 270         return result;
 271 }
 272
 273 static int module_list(int argc, const char **argv, const char *prefix)
 274 {
 275         int i;
 276         struct pathspec pathspec;
 277         struct module_list list = MODULE_LIST_INIT;
 278
 279         struct option module_list_options[] = {
 280                 OPT_STRING(0, "prefix", &prefix,
 281                            N_("path"),
 282                            N_("alternative anchor for relative paths")),
 283                 OPT_END()
 284         };
 285
 286         const char *const git_submodule_helper_usage[] = {
 287                 N_("git submodule--helper list [--prefix=<path>] [<path>...]"),
 288                 NULL
 289         };
 290
 291         argc = parse_options(argc, argv, prefix, module_list_options,
 292                              git_submodule_helper_usage, 0);
 293
 294         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0) {
 295                 printf("#unmatched\n");
 296                 return 1;
 297         }
 298
 299         for (i = 0; i < list.nr; i++) {
 300                 const struct cache_entry *ce = list.entries[i];
 301
 302                 if (ce_stage(ce))
 303                         printf("%06o %s U\t", ce->ce_mode, sha1_to_hex(null_sha1));
 304                 else
 305                         printf("%06o %s %d\t", ce->ce_mode, sha1_to_hex(ce->sha1), ce_stage(ce));
 306
 307                 utf8_fprintf(stdout, "%s\n", ce->name);
 308         }
 309         return 0;
 310 }
 311
 312 static void init_submodule(const char *path, const char *prefix, int quiet)
 313 {
 314         const struct submodule *sub;
 315         struct strbuf sb = STRBUF_INIT;
 316         char *upd = NULL, *url = NULL, *displaypath;
 317
 318         /* Only loads from .gitmodules, no overlay with .git/config */
 319         gitmodules_config();
 320
 321         if (prefix) {
 322                 strbuf_addf(&sb, "%s%s", prefix, path);
 323                 displaypath = strbuf_detach(&sb, NULL);
 324         } else
 325                 displaypath = xstrdup(path);
 326
 327         sub = submodule_from_path(null_sha1, path);
 328
 329         if (!sub)
 330                 die(_("No url found for submodule path '%s' in .gitmodules"),
 331                         displaypath);
 332
 333         /*
 334          * Copy url setting when it is not set yet.
 335          * To look up the url in .git/config, we must not fall back to
 336          * .gitmodules, so look it up directly.
 337          */
 338         strbuf_reset(&sb);
 339         strbuf_addf(&sb, "submodule.%s.url", sub->name);
 340         if (git_config_get_string(sb.buf, &url)) {
 341                 url = xstrdup(sub->url);
 342
 343                 if (!url)
 344                         die(_("No url found for submodule path '%s' in .gitmodules"),
 345                                 displaypath);
 346
 347                 /* Possibly a url relative to parent */
 348                 if (starts_with_dot_dot_slash(url) ||
 349                     starts_with_dot_slash(url)) {
 350                         char *remoteurl, *relurl;
 351                         char *remote = get_default_remote();
 352                         struct strbuf remotesb = STRBUF_INIT;
 353                         strbuf_addf(&remotesb, "remote.%s.url", remote);
 354                         free(remote);
 355
 356                         if (git_config_get_string(remotesb.buf, &remoteurl))
 357                                 /*
 358                                  * The repository is its own
 359                                  * authoritative upstream
 360                                  */
 361                                 remoteurl = xgetcwd();
 362                         relurl = relative_url(remoteurl, url, NULL);
 363                         strbuf_release(&remotesb);
 364                         free(remoteurl);
 365                         free(url);
 366                         url = relurl;
 367                 }
 368
 369                 if (git_config_set_gently(sb.buf, url))
 370                         die(_("Failed to register url for submodule path '%s'"),
 371                             displaypath);
 372                 if (!quiet)
 373                         fprintf(stderr,
 374                                 _("Submodule '%s' (%s) registered for path '%s'\n"),
 375                                 sub->name, url, displaypath);
 376         }
 377
 378         /* Copy "update" setting when it is not set yet */
 379         strbuf_reset(&sb);
 380         strbuf_addf(&sb, "submodule.%s.update", sub->name);
 381         if (git_config_get_string(sb.buf, &upd) &&
 382             sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
 383                 if (sub->update_strategy.type == SM_UPDATE_COMMAND) {
 384                         fprintf(stderr, _("warning: command update mode suggested for submodule '%s'\n"),
 385                                 sub->name);
 386                         upd = xstrdup("none");
 387                 } else
 388                         upd = xstrdup(submodule_strategy_to_string(&sub->update_strategy));
 389
 390                 if (git_config_set_gently(sb.buf, upd))
 391                         die(_("Failed to register update mode for submodule path '%s'"), displaypath);
 392         }
 393         strbuf_release(&sb);
 394         free(displaypath);
 395         free(url);
 396         free(upd);
 397 }
 398
 399 static int module_init(int argc, const char **argv, const char *prefix)
 400 {
 401         struct pathspec pathspec;
 402         struct module_list list = MODULE_LIST_INIT;
 403         int quiet = 0;
 404         int i;
 405
 406         struct option module_init_options[] = {
 407                 OPT_STRING(0, "prefix", &prefix,
 408                            N_("path"),
 409                            N_("alternative anchor for relative paths")),
 410                 OPT__QUIET(&quiet, N_("Suppress output for initializing a submodule")),
 411                 OPT_END()
 412         };
 413
 414         const char *const git_submodule_helper_usage[] = {
 415                 N_("git submodule--helper init [<path>]"),
 416                 NULL
 417         };
 418
 419         argc = parse_options(argc, argv, prefix, module_init_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                 init_submodule(list.entries[i]->name, prefix, quiet);
 427
 428         return 0;
 429 }
 430
 431 static int module_name(int argc, const char **argv, const char *prefix)
 432 {
 433         const struct submodule *sub;
 434
 435         if (argc != 2)
 436                 usage(_("git submodule--helper name <path>"));
 437
 438         gitmodules_config();
 439         sub = submodule_from_path(null_sha1, argv[1]);
 440
 441         if (!sub)
 442                 die(_("no submodule mapping found in .gitmodules for path '%s'"),
 443                     argv[1]);
 444
 445         printf("%s\n", sub->name);
 446
 447         return 0;
 448 }
 449 static int clone_submodule(const char *path, const char *gitdir, const char *url,
 450                            const char *depth, const char *reference, int quiet)
 451 {
 452         struct child_process cp;
 453         child_process_init(&cp);
 454
 455         argv_array_push(&cp.args, "clone");
 456         argv_array_push(&cp.args, "--no-checkout");
 457         if (quiet)
 458                 argv_array_push(&cp.args, "--quiet");
 459         if (depth && *depth)
 460                 argv_array_pushl(&cp.args, "--depth", depth, NULL);
 461         if (reference && *reference)
 462                 argv_array_pushl(&cp.args, "--reference", reference, NULL);
 463         if (gitdir && *gitdir)
 464                 argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
 465
 466         argv_array_push(&cp.args, url);
 467         argv_array_push(&cp.args, path);
 468
 469         cp.git_cmd = 1;
 470         cp.env = local_repo_env;
 471         cp.no_stdin = 1;
 472
 473         return run_command(&cp);
 474 }
 475
 476 static int module_clone(int argc, const char **argv, const char *prefix)
 477 {
 478         const char *name = NULL, *url = NULL;
 479         const char *reference = NULL, *depth = NULL;
 480         int quiet = 0;
 481         FILE *submodule_dot_git;
 482         char *p, *path = NULL, *sm_gitdir;
 483         struct strbuf rel_path = STRBUF_INIT;
 484         struct strbuf sb = STRBUF_INIT;
 485
 486         struct option module_clone_options[] = {
 487                 OPT_STRING(0, "prefix", &prefix,
 488                            N_("path"),
 489                            N_("alternative anchor for relative paths")),
 490                 OPT_STRING(0, "path", &path,
 491                            N_("path"),
 492                            N_("where the new submodule will be cloned to")),
 493                 OPT_STRING(0, "name", &name,
 494                            N_("string"),
 495                            N_("name of the new submodule")),
 496                 OPT_STRING(0, "url", &url,
 497                            N_("string"),
 498                            N_("url where to clone the submodule from")),
 499                 OPT_STRING(0, "reference", &reference,
 500                            N_("string"),
 501                            N_("reference repository")),
 502                 OPT_STRING(0, "depth", &depth,
 503                            N_("string"),
 504                            N_("depth for shallow clones")),
 505                 OPT__QUIET(&quiet, "Suppress output for cloning a submodule"),
 506                 OPT_END()
 507         };
 508
 509         const char *const git_submodule_helper_usage[] = {
 510                 N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
 511                    "[--reference <repository>] [--name <name>] [--url <url>]"
 512                    "[--depth <depth>] [--] [<path>...]"),
 513                 NULL
 514         };
 515
 516         argc = parse_options(argc, argv, prefix, module_clone_options,
 517                              git_submodule_helper_usage, 0);
 518
 519         if (!path || !*path)
 520                 die(_("submodule--helper: unspecified or empty --path"));
 521
 522         strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
 523         sm_gitdir = xstrdup(absolute_path(sb.buf));
 524         strbuf_reset(&sb);
 525
 526         if (!is_absolute_path(path)) {
 527                 strbuf_addf(&sb, "%s/%s", get_git_work_tree(), path);
 528                 path = strbuf_detach(&sb, NULL);
 529         } else
 530                 path = xstrdup(path);
 531
 532         if (!file_exists(sm_gitdir)) {
 533                 if (safe_create_leading_directories_const(sm_gitdir) < 0)
 534                         die(_("could not create directory '%s'"), sm_gitdir);
 535                 if (clone_submodule(path, sm_gitdir, url, depth, reference, quiet))
 536                         die(_("clone of '%s' into submodule path '%s' failed"),
 537                             url, path);
 538         } else {
 539                 if (safe_create_leading_directories_const(path) < 0)
 540                         die(_("could not create directory '%s'"), path);
 541                 strbuf_addf(&sb, "%s/index", sm_gitdir);
 542                 unlink_or_warn(sb.buf);
 543                 strbuf_reset(&sb);
 544         }
 545
 546         /* Write a .git file in the submodule to redirect to the superproject. */
 547         strbuf_addf(&sb, "%s/.git", path);
 548         if (safe_create_leading_directories_const(sb.buf) < 0)
 549                 die(_("could not create leading directories of '%s'"), sb.buf);
 550         submodule_dot_git = fopen(sb.buf, "w");
 551         if (!submodule_dot_git)
 552                 die_errno(_("cannot open file '%s'"), sb.buf);
 553
 554         fprintf_or_die(submodule_dot_git, "gitdir: %s\n",
 555                        relative_path(sm_gitdir, path, &rel_path));
 556         if (fclose(submodule_dot_git))
 557                 die(_("could not close file %s"), sb.buf);
 558         strbuf_reset(&sb);
 559         strbuf_reset(&rel_path);
 560
 561         /* Redirect the worktree of the submodule in the superproject's config */
 562         p = git_pathdup_submodule(path, "config");
 563         if (!p)
 564                 die(_("could not get submodule directory for '%s'"), path);
 565         git_config_set_in_file(p, "core.worktree",
 566                                relative_path(path, sm_gitdir, &rel_path));
 567         strbuf_release(&sb);
 568         strbuf_release(&rel_path);
 569         free(sm_gitdir);
 570         free(path);
 571         free(p);
 572         return 0;
 573 }
 574
 575 struct submodule_update_clone {
 576         /* index into 'list', the list of submodules to look into for cloning */
 577         int current;
 578         struct module_list list;
 579         unsigned warn_if_uninitialized : 1;
 580
 581         /* update parameter passed via commandline */
 582         struct submodule_update_strategy update;
 583
 584         /* configuration parameters which are passed on to the children */
 585         int quiet;
 586         const char *reference;
 587         const char *depth;
 588         const char *recursive_prefix;
 589         const char *prefix;
 590
 591         /* Machine-readable status lines to be consumed by git-submodule.sh */
 592         struct string_list projectlines;
 593
 594         /* If we want to stop as fast as possible and return an error */
 595         unsigned quickstop : 1;
 596 };
 597 #define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
 598         SUBMODULE_UPDATE_STRATEGY_INIT, 0, NULL, NULL, NULL, NULL, \
 599         STRING_LIST_INIT_DUP, 0}
 600
 601
 602 static void next_submodule_warn_missing(struct submodule_update_clone *suc,
 603                 struct strbuf *out, const char *displaypath)
 604 {
 605         /*
 606          * Only mention uninitialized submodules when their
 607          * paths have been specified.
 608          */
 609         if (suc->warn_if_uninitialized) {
 610                 strbuf_addf(out,
 611                         _("Submodule path '%s' not initialized"),
 612                         displaypath);
 613                 strbuf_addch(out, '\n');
 614                 strbuf_addstr(out,
 615                         _("Maybe you want to use 'update --init'?"));
 616                 strbuf_addch(out, '\n');
 617         }
 618 }
 619
 620 /**
 621  * Determine whether 'ce' needs to be cloned. If so, prepare the 'child' to
 622  * run the clone. Returns 1 if 'ce' needs to be cloned, 0 otherwise.
 623  */
 624 static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
 625                                            struct child_process *child,
 626                                            struct submodule_update_clone *suc,
 627                                            struct strbuf *out)
 628 {
 629         const struct submodule *sub = NULL;
 630         struct strbuf displaypath_sb = STRBUF_INIT;
 631         struct strbuf sb = STRBUF_INIT;
 632         const char *displaypath = NULL;
 633         char *url = NULL;
 634         int needs_cloning = 0;
 635
 636         if (ce_stage(ce)) {
 637                 if (suc->recursive_prefix)
 638                         strbuf_addf(&sb, "%s/%s", suc->recursive_prefix, ce->name);
 639                 else
 640                         strbuf_addf(&sb, "%s", ce->name);
 641                 strbuf_addf(out, _("Skipping unmerged submodule %s"), sb.buf);
 642                 strbuf_addch(out, '\n');
 643                 goto cleanup;
 644         }
 645
 646         sub = submodule_from_path(null_sha1, ce->name);
 647
 648         if (suc->recursive_prefix)
 649                 displaypath = relative_path(suc->recursive_prefix,
 650                                             ce->name, &displaypath_sb);
 651         else
 652                 displaypath = ce->name;
 653
 654         if (!sub) {
 655                 next_submodule_warn_missing(suc, out, displaypath);
 656                 goto cleanup;
 657         }
 658
 659         if (suc->update.type == SM_UPDATE_NONE
 660             || (suc->update.type == SM_UPDATE_UNSPECIFIED
 661                 && sub->update_strategy.type == SM_UPDATE_NONE)) {
 662                 strbuf_addf(out, _("Skipping submodule '%s'"), displaypath);
 663                 strbuf_addch(out, '\n');
 664                 goto cleanup;
 665         }
 666
 667         /*
 668          * Looking up the url in .git/config.
 669          * We must not fall back to .gitmodules as we only want
 670          * to process configured submodules.
 671          */
 672         strbuf_reset(&sb);
 673         strbuf_addf(&sb, "submodule.%s.url", sub->name);
 674         git_config_get_string(sb.buf, &url);
 675         if (!url) {
 676                 next_submodule_warn_missing(suc, out, displaypath);
 677                 goto cleanup;
 678         }
 679
 680         strbuf_reset(&sb);
 681         strbuf_addf(&sb, "%s/.git", ce->name);
 682         needs_cloning = !file_exists(sb.buf);
 683
 684         strbuf_reset(&sb);
 685         strbuf_addf(&sb, "%06o %s %d %d\t%s\n", ce->ce_mode,
 686                         sha1_to_hex(ce->sha1), ce_stage(ce),
 687                         needs_cloning, ce->name);
 688         string_list_append(&suc->projectlines, sb.buf);
 689
 690         if (!needs_cloning)
 691                 goto cleanup;
 692
 693         child->git_cmd = 1;
 694         child->no_stdin = 1;
 695         child->stdout_to_stderr = 1;
 696         child->err = -1;
 697         argv_array_push(&child->args, "submodule--helper");
 698         argv_array_push(&child->args, "clone");
 699         if (suc->quiet)
 700                 argv_array_push(&child->args, "--quiet");
 701         if (suc->prefix)
 702                 argv_array_pushl(&child->args, "--prefix", suc->prefix, NULL);
 703         argv_array_pushl(&child->args, "--path", sub->path, NULL);
 704         argv_array_pushl(&child->args, "--name", sub->name, NULL);
 705         argv_array_pushl(&child->args, "--url", url, NULL);
 706         if (suc->reference)
 707                 argv_array_push(&child->args, suc->reference);
 708         if (suc->depth)
 709                 argv_array_push(&child->args, suc->depth);
 710
 711 cleanup:
 712         free(url);
 713         strbuf_reset(&displaypath_sb);
 714         strbuf_reset(&sb);
 715
 716         return needs_cloning;
 717 }
 718
 719 static int update_clone_get_next_task(struct child_process *child,
 720                                       struct strbuf *err,
 721                                       void *suc_cb,
 722                                       void **void_task_cb)
 723 {
 724         struct submodule_update_clone *suc = suc_cb;
 725
 726         for (; suc->current < suc->list.nr; suc->current++) {
 727                 const struct cache_entry *ce = suc->list.entries[suc->current];
 728                 if (prepare_to_clone_next_submodule(ce, child, suc, err)) {
 729                         suc->current++;
 730                         return 1;
 731                 }
 732         }
 733         return 0;
 734 }
 735
 736 static int update_clone_start_failure(struct strbuf *err,
 737                                       void *suc_cb,
 738                                       void *void_task_cb)
 739 {
 740         struct submodule_update_clone *suc = suc_cb;
 741         suc->quickstop = 1;
 742         return 1;
 743 }
 744
 745 static int update_clone_task_finished(int result,
 746                                       struct strbuf *err,
 747                                       void *suc_cb,
 748                                       void *void_task_cb)
 749 {
 750         struct submodule_update_clone *suc = suc_cb;
 751
 752         if (!result)
 753                 return 0;
 754
 755         suc->quickstop = 1;
 756         return 1;
 757 }
 758
 759 static int update_clone(int argc, const char **argv, const char *prefix)
 760 {
 761         const char *update = NULL;
 762         int max_jobs = -1;
 763         struct string_list_item *item;
 764         struct pathspec pathspec;
 765         struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
 766
 767         struct option module_update_clone_options[] = {
 768                 OPT_STRING(0, "prefix", &prefix,
 769                            N_("path"),
 770                            N_("path into the working tree")),
 771                 OPT_STRING(0, "recursive-prefix", &suc.recursive_prefix,
 772                            N_("path"),
 773                            N_("path into the working tree, across nested "
 774                               "submodule boundaries")),
 775                 OPT_STRING(0, "update", &update,
 776                            N_("string"),
 777                            N_("rebase, merge, checkout or none")),
 778                 OPT_STRING(0, "reference", &suc.reference, N_("repo"),
 779                            N_("reference repository")),
 780                 OPT_STRING(0, "depth", &suc.depth, "<depth>",
 781                            N_("Create a shallow clone truncated to the "
 782                               "specified number of revisions")),
 783                 OPT_INTEGER('j', "jobs", &max_jobs,
 784                             N_("parallel jobs")),
 785                 OPT__QUIET(&suc.quiet, N_("don't print cloning progress")),
 786                 OPT_END()
 787         };
 788
 789         const char *const git_submodule_helper_usage[] = {
 790                 N_("git submodule--helper update_clone [--prefix=<path>] [<path>...]"),
 791                 NULL
 792         };
 793         suc.prefix = prefix;
 794
 795         argc = parse_options(argc, argv, prefix, module_update_clone_options,
 796                              git_submodule_helper_usage, 0);
 797
 798         if (update)
 799                 if (parse_submodule_update_strategy(update, &suc.update) < 0)
 800                         die(_("bad value for update parameter"));
 801
 802         if (module_list_compute(argc, argv, prefix, &pathspec, &suc.list) < 0)
 803                 return 1;
 804
 805         if (pathspec.nr)
 806                 suc.warn_if_uninitialized = 1;
 807
 808         /* Overlay the parsed .gitmodules file with .git/config */
 809         gitmodules_config();
 810         git_config(submodule_config, NULL);
 811
 812         if (max_jobs < 0)
 813                 max_jobs = parallel_submodules();
 814
 815         run_processes_parallel(max_jobs,
 816                                update_clone_get_next_task,
 817                                update_clone_start_failure,
 818                                update_clone_task_finished,
 819                                &suc);
 820
 821         /*
 822          * We saved the output and put it out all at once now.
 823          * That means:
 824          * - the listener does not have to interleave their (checkout)
 825          *   work with our fetching.  The writes involved in a
 826          *   checkout involve more straightforward sequential I/O.
 827          * - the listener can avoid doing any work if fetching failed.
 828          */
 829         if (suc.quickstop)
 830                 return 1;
 831
 832         for_each_string_list_item(item, &suc.projectlines)
 833                 utf8_fprintf(stdout, "%s", item->string);
 834
 835         return 0;
 836 }
 837
 838 struct cmd_struct {
 839         const char *cmd;
 840         int (*fn)(int, const char **, const char *);
 841 };
 842
 843 static struct cmd_struct commands[] = {
 844         {"list", module_list},
 845         {"name", module_name},
 846         {"clone", module_clone},
 847         {"update-clone", update_clone},
 848         {"resolve-relative-url", resolve_relative_url},
 849         {"resolve-relative-url-test", resolve_relative_url_test},
 850         {"init", module_init}
 851 };
 852
 853 int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
 854 {
 855         int i;
 856         if (argc < 2)
 857                 die(_("submodule--helper subcommand must be "
 858                       "called with a subcommand"));
 859
 860         for (i = 0; i < ARRAY_SIZE(commands); i++)
 861                 if (!strcmp(argv[1], commands[i].cmd))
 862                         return commands[i].fn(argc - 1, argv + 1, prefix);
 863
 864         die(_("'%s' is not a valid submodule--helper "
 865               "subcommand"), argv[1]);
 866 }