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                        prefix, argv);
 238
 239         if (pathspec->nr)
 240                 ps_matched = xcalloc(pathspec->nr, 1);
 241
 242         if (read_cache() < 0)
 243                 die(_("index file corrupt"));
 244
 245         for (i = 0; i < active_nr; i++) {
 246                 const struct cache_entry *ce = active_cache[i];
 247
 248                 if (!match_pathspec(pathspec, ce->name, ce_namelen(ce),
 249                                     0, ps_matched, 1) ||
 250                     !S_ISGITLINK(ce->ce_mode))
 251                         continue;
 252
 253                 ALLOC_GROW(list->entries, list->nr + 1, list->alloc);
 254                 list->entries[list->nr++] = ce;
 255                 while (i + 1 < active_nr &&
 256                        !strcmp(ce->name, active_cache[i + 1]->name))
 257                         /*
 258                          * Skip entries with the same name in different stages
 259                          * to make sure an entry is returned only once.
 260                          */
 261                         i++;
 262         }
 263
 264         if (ps_matched && report_path_error(ps_matched, pathspec, prefix))
 265                 result = -1;
 266
 267         free(ps_matched);
 268
 269         return result;
 270 }
 271
 272 static void module_list_active(struct module_list *list)
 273 {
 274         int i;
 275         struct module_list active_modules = MODULE_LIST_INIT;
 276
 277         gitmodules_config();
 278
 279         for (i = 0; i < list->nr; i++) {
 280                 const struct cache_entry *ce = list->entries[i];
 281
 282                 if (!is_submodule_initialized(ce->name))
 283                         continue;
 284
 285                 ALLOC_GROW(active_modules.entries,
 286                            active_modules.nr + 1,
 287                            active_modules.alloc);
 288                 active_modules.entries[active_modules.nr++] = ce;
 289         }
 290
 291         free(list->entries);
 292         *list = active_modules;
 293 }
 294
 295 static int module_list(int argc, const char **argv, const char *prefix)
 296 {
 297         int i;
 298         struct pathspec pathspec;
 299         struct module_list list = MODULE_LIST_INIT;
 300
 301         struct option module_list_options[] = {
 302                 OPT_STRING(0, "prefix", &prefix,
 303                            N_("path"),
 304                            N_("alternative anchor for relative paths")),
 305                 OPT_END()
 306         };
 307
 308         const char *const git_submodule_helper_usage[] = {
 309                 N_("git submodule--helper list [--prefix=<path>] [<path>...]"),
 310                 NULL
 311         };
 312
 313         argc = parse_options(argc, argv, prefix, module_list_options,
 314                              git_submodule_helper_usage, 0);
 315
 316         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 317                 return 1;
 318
 319         for (i = 0; i < list.nr; i++) {
 320                 const struct cache_entry *ce = list.entries[i];
 321
 322                 if (ce_stage(ce))
 323                         printf("%06o %s U\t", ce->ce_mode, sha1_to_hex(null_sha1));
 324                 else
 325                         printf("%06o %s %d\t", ce->ce_mode,
 326                                oid_to_hex(&ce->oid), ce_stage(ce));
 327
 328                 utf8_fprintf(stdout, "%s\n", ce->name);
 329         }
 330         return 0;
 331 }
 332
 333 static void init_submodule(const char *path, const char *prefix, int quiet)
 334 {
 335         const struct submodule *sub;
 336         struct strbuf sb = STRBUF_INIT;
 337         char *upd = NULL, *url = NULL, *displaypath;
 338
 339         /* Only loads from .gitmodules, no overlay with .git/config */
 340         gitmodules_config();
 341
 342         if (prefix && get_super_prefix())
 343                 die("BUG: cannot have prefix and superprefix");
 344         else if (prefix)
 345                 displaypath = xstrdup(relative_path(path, prefix, &sb));
 346         else if (get_super_prefix()) {
 347                 strbuf_addf(&sb, "%s%s", get_super_prefix(), path);
 348                 displaypath = strbuf_detach(&sb, NULL);
 349         } else
 350                 displaypath = xstrdup(path);
 351
 352         sub = submodule_from_path(null_sha1, path);
 353
 354         if (!sub)
 355                 die(_("No url found for submodule path '%s' in .gitmodules"),
 356                         displaypath);
 357
 358         /*
 359          * NEEDSWORK: In a multi-working-tree world, this needs to be
 360          * set in the per-worktree config.
 361          *
 362          * Set active flag for the submodule being initialized
 363          */
 364         if (!is_submodule_initialized(path)) {
 365                 strbuf_reset(&sb);
 366                 strbuf_addf(&sb, "submodule.%s.active", sub->name);
 367                 git_config_set_gently(sb.buf, "true");
 368         }
 369
 370         /*
 371          * Copy url setting when it is not set yet.
 372          * To look up the url in .git/config, we must not fall back to
 373          * .gitmodules, so look it up directly.
 374          */
 375         strbuf_reset(&sb);
 376         strbuf_addf(&sb, "submodule.%s.url", sub->name);
 377         if (git_config_get_string(sb.buf, &url)) {
 378                 if (!sub->url)
 379                         die(_("No url found for submodule path '%s' in .gitmodules"),
 380                                 displaypath);
 381
 382                 url = xstrdup(sub->url);
 383
 384                 /* Possibly a url relative to parent */
 385                 if (starts_with_dot_dot_slash(url) ||
 386                     starts_with_dot_slash(url)) {
 387                         char *remoteurl, *relurl;
 388                         char *remote = get_default_remote();
 389                         struct strbuf remotesb = STRBUF_INIT;
 390                         strbuf_addf(&remotesb, "remote.%s.url", remote);
 391                         free(remote);
 392
 393                         if (git_config_get_string(remotesb.buf, &remoteurl)) {
 394                                 warning(_("could not lookup configuration '%s'. Assuming this repository is its own authoritative upstream."), remotesb.buf);
 395                                 remoteurl = xgetcwd();
 396                         }
 397                         relurl = relative_url(remoteurl, url, NULL);
 398                         strbuf_release(&remotesb);
 399                         free(remoteurl);
 400                         free(url);
 401                         url = relurl;
 402                 }
 403
 404                 if (git_config_set_gently(sb.buf, url))
 405                         die(_("Failed to register url for submodule path '%s'"),
 406                             displaypath);
 407                 if (!quiet)
 408                         fprintf(stderr,
 409                                 _("Submodule '%s' (%s) registered for path '%s'\n"),
 410                                 sub->name, url, displaypath);
 411         }
 412
 413         /* Copy "update" setting when it is not set yet */
 414         strbuf_reset(&sb);
 415         strbuf_addf(&sb, "submodule.%s.update", sub->name);
 416         if (git_config_get_string(sb.buf, &upd) &&
 417             sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
 418                 if (sub->update_strategy.type == SM_UPDATE_COMMAND) {
 419                         fprintf(stderr, _("warning: command update mode suggested for submodule '%s'\n"),
 420                                 sub->name);
 421                         upd = xstrdup("none");
 422                 } else
 423                         upd = xstrdup(submodule_strategy_to_string(&sub->update_strategy));
 424
 425                 if (git_config_set_gently(sb.buf, upd))
 426                         die(_("Failed to register update mode for submodule path '%s'"), displaypath);
 427         }
 428         strbuf_release(&sb);
 429         free(displaypath);
 430         free(url);
 431         free(upd);
 432 }
 433
 434 static int module_init(int argc, const char **argv, const char *prefix)
 435 {
 436         struct pathspec pathspec;
 437         struct module_list list = MODULE_LIST_INIT;
 438         int quiet = 0;
 439         int i;
 440
 441         struct option module_init_options[] = {
 442                 OPT__QUIET(&quiet, N_("Suppress output for initializing a submodule")),
 443                 OPT_END()
 444         };
 445
 446         const char *const git_submodule_helper_usage[] = {
 447                 N_("git submodule--helper init [<path>]"),
 448                 NULL
 449         };
 450
 451         argc = parse_options(argc, argv, prefix, module_init_options,
 452                              git_submodule_helper_usage, 0);
 453
 454         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 455                 return 1;
 456
 457         /*
 458          * If there are no path args and submodule.active is set then,
 459          * by default, only initialize 'active' modules.
 460          */
 461         if (!argc && git_config_get_value_multi("submodule.active"))
 462                 module_list_active(&list);
 463
 464         for (i = 0; i < list.nr; i++)
 465                 init_submodule(list.entries[i]->name, prefix, quiet);
 466
 467         return 0;
 468 }
 469
 470 static int module_name(int argc, const char **argv, const char *prefix)
 471 {
 472         const struct submodule *sub;
 473
 474         if (argc != 2)
 475                 usage(_("git submodule--helper name <path>"));
 476
 477         gitmodules_config();
 478         sub = submodule_from_path(null_sha1, argv[1]);
 479
 480         if (!sub)
 481                 die(_("no submodule mapping found in .gitmodules for path '%s'"),
 482                     argv[1]);
 483
 484         printf("%s\n", sub->name);
 485
 486         return 0;
 487 }
 488
 489 static int clone_submodule(const char *path, const char *gitdir, const char *url,
 490                            const char *depth, struct string_list *reference,
 491                            int quiet, int progress)
 492 {
 493         struct child_process cp = CHILD_PROCESS_INIT;
 494
 495         argv_array_push(&cp.args, "clone");
 496         argv_array_push(&cp.args, "--no-checkout");
 497         if (quiet)
 498                 argv_array_push(&cp.args, "--quiet");
 499         if (progress)
 500                 argv_array_push(&cp.args, "--progress");
 501         if (depth && *depth)
 502                 argv_array_pushl(&cp.args, "--depth", depth, NULL);
 503         if (reference->nr) {
 504                 struct string_list_item *item;
 505                 for_each_string_list_item(item, reference)
 506                         argv_array_pushl(&cp.args, "--reference",
 507                                          item->string, NULL);
 508         }
 509         if (gitdir && *gitdir)
 510                 argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
 511
 512         argv_array_push(&cp.args, url);
 513         argv_array_push(&cp.args, path);
 514
 515         cp.git_cmd = 1;
 516         prepare_submodule_repo_env(&cp.env_array);
 517         cp.no_stdin = 1;
 518
 519         return run_command(&cp);
 520 }
 521
 522 struct submodule_alternate_setup {
 523         const char *submodule_name;
 524         enum SUBMODULE_ALTERNATE_ERROR_MODE {
 525                 SUBMODULE_ALTERNATE_ERROR_DIE,
 526                 SUBMODULE_ALTERNATE_ERROR_INFO,
 527                 SUBMODULE_ALTERNATE_ERROR_IGNORE
 528         } error_mode;
 529         struct string_list *reference;
 530 };
 531 #define SUBMODULE_ALTERNATE_SETUP_INIT { NULL, \
 532         SUBMODULE_ALTERNATE_ERROR_IGNORE, NULL }
 533
 534 static int add_possible_reference_from_superproject(
 535                 struct alternate_object_database *alt, void *sas_cb)
 536 {
 537         struct submodule_alternate_setup *sas = sas_cb;
 538
 539         /*
 540          * If the alternate object store is another repository, try the
 541          * standard layout with .git/(modules/<name>)+/objects
 542          */
 543         if (ends_with(alt->path, "/objects")) {
 544                 char *sm_alternate;
 545                 struct strbuf sb = STRBUF_INIT;
 546                 struct strbuf err = STRBUF_INIT;
 547                 strbuf_add(&sb, alt->path, strlen(alt->path) - strlen("objects"));
 548
 549                 /*
 550                  * We need to end the new path with '/' to mark it as a dir,
 551                  * otherwise a submodule name containing '/' will be broken
 552                  * as the last part of a missing submodule reference would
 553                  * be taken as a file name.
 554                  */
 555                 strbuf_addf(&sb, "modules/%s/", sas->submodule_name);
 556
 557                 sm_alternate = compute_alternate_path(sb.buf, &err);
 558                 if (sm_alternate) {
 559                         string_list_append(sas->reference, xstrdup(sb.buf));
 560                         free(sm_alternate);
 561                 } else {
 562                         switch (sas->error_mode) {
 563                         case SUBMODULE_ALTERNATE_ERROR_DIE:
 564                                 die(_("submodule '%s' cannot add alternate: %s"),
 565                                     sas->submodule_name, err.buf);
 566                         case SUBMODULE_ALTERNATE_ERROR_INFO:
 567                                 fprintf(stderr, _("submodule '%s' cannot add alternate: %s"),
 568                                         sas->submodule_name, err.buf);
 569                         case SUBMODULE_ALTERNATE_ERROR_IGNORE:
 570                                 ; /* nothing */
 571                         }
 572                 }
 573                 strbuf_release(&sb);
 574         }
 575
 576         return 0;
 577 }
 578
 579 static void prepare_possible_alternates(const char *sm_name,
 580                 struct string_list *reference)
 581 {
 582         char *sm_alternate = NULL, *error_strategy = NULL;
 583         struct submodule_alternate_setup sas = SUBMODULE_ALTERNATE_SETUP_INIT;
 584
 585         git_config_get_string("submodule.alternateLocation", &sm_alternate);
 586         if (!sm_alternate)
 587                 return;
 588
 589         git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
 590
 591         if (!error_strategy)
 592                 error_strategy = xstrdup("die");
 593
 594         sas.submodule_name = sm_name;
 595         sas.reference = reference;
 596         if (!strcmp(error_strategy, "die"))
 597                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_DIE;
 598         else if (!strcmp(error_strategy, "info"))
 599                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_INFO;
 600         else if (!strcmp(error_strategy, "ignore"))
 601                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_IGNORE;
 602         else
 603                 die(_("Value '%s' for submodule.alternateErrorStrategy is not recognized"), error_strategy);
 604
 605         if (!strcmp(sm_alternate, "superproject"))
 606                 foreach_alt_odb(add_possible_reference_from_superproject, &sas);
 607         else if (!strcmp(sm_alternate, "no"))
 608                 ; /* do nothing */
 609         else
 610                 die(_("Value '%s' for submodule.alternateLocation is not recognized"), sm_alternate);
 611
 612         free(sm_alternate);
 613         free(error_strategy);
 614 }
 615
 616 static int module_clone(int argc, const char **argv, const char *prefix)
 617 {
 618         const char *name = NULL, *url = NULL, *depth = NULL;
 619         int quiet = 0;
 620         int progress = 0;
 621         char *p, *path = NULL, *sm_gitdir;
 622         struct strbuf sb = STRBUF_INIT;
 623         struct string_list reference = STRING_LIST_INIT_NODUP;
 624         char *sm_alternate = NULL, *error_strategy = NULL;
 625
 626         struct option module_clone_options[] = {
 627                 OPT_STRING(0, "prefix", &prefix,
 628                            N_("path"),
 629                            N_("alternative anchor for relative paths")),
 630                 OPT_STRING(0, "path", &path,
 631                            N_("path"),
 632                            N_("where the new submodule will be cloned to")),
 633                 OPT_STRING(0, "name", &name,
 634                            N_("string"),
 635                            N_("name of the new submodule")),
 636                 OPT_STRING(0, "url", &url,
 637                            N_("string"),
 638                            N_("url where to clone the submodule from")),
 639                 OPT_STRING_LIST(0, "reference", &reference,
 640                            N_("repo"),
 641                            N_("reference repository")),
 642                 OPT_STRING(0, "depth", &depth,
 643                            N_("string"),
 644                            N_("depth for shallow clones")),
 645                 OPT__QUIET(&quiet, "Suppress output for cloning a submodule"),
 646                 OPT_BOOL(0, "progress", &progress,
 647                            N_("force cloning progress")),
 648                 OPT_END()
 649         };
 650
 651         const char *const git_submodule_helper_usage[] = {
 652                 N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
 653                    "[--reference <repository>] [--name <name>] [--depth <depth>] "
 654                    "--url <url> --path <path>"),
 655                 NULL
 656         };
 657
 658         argc = parse_options(argc, argv, prefix, module_clone_options,
 659                              git_submodule_helper_usage, 0);
 660
 661         if (argc || !url || !path || !*path)
 662                 usage_with_options(git_submodule_helper_usage,
 663                                    module_clone_options);
 664
 665         strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
 666         sm_gitdir = absolute_pathdup(sb.buf);
 667         strbuf_reset(&sb);
 668
 669         if (!is_absolute_path(path)) {
 670                 strbuf_addf(&sb, "%s/%s", get_git_work_tree(), path);
 671                 path = strbuf_detach(&sb, NULL);
 672         } else
 673                 path = xstrdup(path);
 674
 675         if (!file_exists(sm_gitdir)) {
 676                 if (safe_create_leading_directories_const(sm_gitdir) < 0)
 677                         die(_("could not create directory '%s'"), sm_gitdir);
 678
 679                 prepare_possible_alternates(name, &reference);
 680
 681                 if (clone_submodule(path, sm_gitdir, url, depth, &reference,
 682                                     quiet, progress))
 683                         die(_("clone of '%s' into submodule path '%s' failed"),
 684                             url, path);
 685         } else {
 686                 if (safe_create_leading_directories_const(path) < 0)
 687                         die(_("could not create directory '%s'"), path);
 688                 strbuf_addf(&sb, "%s/index", sm_gitdir);
 689                 unlink_or_warn(sb.buf);
 690                 strbuf_reset(&sb);
 691         }
 692
 693         /* Connect module worktree and git dir */
 694         connect_work_tree_and_git_dir(path, sm_gitdir);
 695
 696         p = git_pathdup_submodule(path, "config");
 697         if (!p)
 698                 die(_("could not get submodule directory for '%s'"), path);
 699
 700         /* setup alternateLocation and alternateErrorStrategy in the cloned submodule if needed */
 701         git_config_get_string("submodule.alternateLocation", &sm_alternate);
 702         if (sm_alternate)
 703                 git_config_set_in_file(p, "submodule.alternateLocation",
 704                                            sm_alternate);
 705         git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
 706         if (error_strategy)
 707                 git_config_set_in_file(p, "submodule.alternateErrorStrategy",
 708                                            error_strategy);
 709
 710         free(sm_alternate);
 711         free(error_strategy);
 712
 713         strbuf_release(&sb);
 714         free(sm_gitdir);
 715         free(path);
 716         free(p);
 717         return 0;
 718 }
 719
 720 struct submodule_update_clone {
 721         /* index into 'list', the list of submodules to look into for cloning */
 722         int current;
 723         struct module_list list;
 724         unsigned warn_if_uninitialized : 1;
 725
 726         /* update parameter passed via commandline */
 727         struct submodule_update_strategy update;
 728
 729         /* configuration parameters which are passed on to the children */
 730         int progress;
 731         int quiet;
 732         int recommend_shallow;
 733         struct string_list references;
 734         const char *depth;
 735         const char *recursive_prefix;
 736         const char *prefix;
 737
 738         /* Machine-readable status lines to be consumed by git-submodule.sh */
 739         struct string_list projectlines;
 740
 741         /* If we want to stop as fast as possible and return an error */
 742         unsigned quickstop : 1;
 743
 744         /* failed clones to be retried again */
 745         const struct cache_entry **failed_clones;
 746         int failed_clones_nr, failed_clones_alloc;
 747 };
 748 #define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
 749         SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, \
 750         NULL, NULL, NULL, \
 751         STRING_LIST_INIT_DUP, 0, NULL, 0, 0}
 752
 753
 754 static void next_submodule_warn_missing(struct submodule_update_clone *suc,
 755                 struct strbuf *out, const char *displaypath)
 756 {
 757         /*
 758          * Only mention uninitialized submodules when their
 759          * paths have been specified.
 760          */
 761         if (suc->warn_if_uninitialized) {
 762                 strbuf_addf(out,
 763                         _("Submodule path '%s' not initialized"),
 764                         displaypath);
 765                 strbuf_addch(out, '\n');
 766                 strbuf_addstr(out,
 767                         _("Maybe you want to use 'update --init'?"));
 768                 strbuf_addch(out, '\n');
 769         }
 770 }
 771
 772 /**
 773  * Determine whether 'ce' needs to be cloned. If so, prepare the 'child' to
 774  * run the clone. Returns 1 if 'ce' needs to be cloned, 0 otherwise.
 775  */
 776 static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
 777                                            struct child_process *child,
 778                                            struct submodule_update_clone *suc,
 779                                            struct strbuf *out)
 780 {
 781         const struct submodule *sub = NULL;
 782         struct strbuf displaypath_sb = STRBUF_INIT;
 783         struct strbuf sb = STRBUF_INIT;
 784         const char *displaypath = NULL;
 785         int needs_cloning = 0;
 786
 787         if (ce_stage(ce)) {
 788                 if (suc->recursive_prefix)
 789                         strbuf_addf(&sb, "%s/%s", suc->recursive_prefix, ce->name);
 790                 else
 791                         strbuf_addstr(&sb, ce->name);
 792                 strbuf_addf(out, _("Skipping unmerged submodule %s"), sb.buf);
 793                 strbuf_addch(out, '\n');
 794                 goto cleanup;
 795         }
 796
 797         sub = submodule_from_path(null_sha1, ce->name);
 798
 799         if (suc->recursive_prefix)
 800                 displaypath = relative_path(suc->recursive_prefix,
 801                                             ce->name, &displaypath_sb);
 802         else
 803                 displaypath = ce->name;
 804
 805         if (!sub) {
 806                 next_submodule_warn_missing(suc, out, displaypath);
 807                 goto cleanup;
 808         }
 809
 810         if (suc->update.type == SM_UPDATE_NONE
 811             || (suc->update.type == SM_UPDATE_UNSPECIFIED
 812                 && sub->update_strategy.type == SM_UPDATE_NONE)) {
 813                 strbuf_addf(out, _("Skipping submodule '%s'"), displaypath);
 814                 strbuf_addch(out, '\n');
 815                 goto cleanup;
 816         }
 817
 818         /* Check if the submodule has been initialized. */
 819         if (!is_submodule_initialized(ce->name)) {
 820                 next_submodule_warn_missing(suc, out, displaypath);
 821                 goto cleanup;
 822         }
 823
 824         strbuf_reset(&sb);
 825         strbuf_addf(&sb, "%s/.git", ce->name);
 826         needs_cloning = !file_exists(sb.buf);
 827
 828         strbuf_reset(&sb);
 829         strbuf_addf(&sb, "%06o %s %d %d\t%s\n", ce->ce_mode,
 830                         oid_to_hex(&ce->oid), ce_stage(ce),
 831                         needs_cloning, ce->name);
 832         string_list_append(&suc->projectlines, sb.buf);
 833
 834         if (!needs_cloning)
 835                 goto cleanup;
 836
 837         child->git_cmd = 1;
 838         child->no_stdin = 1;
 839         child->stdout_to_stderr = 1;
 840         child->err = -1;
 841         argv_array_push(&child->args, "submodule--helper");
 842         argv_array_push(&child->args, "clone");
 843         if (suc->progress)
 844                 argv_array_push(&child->args, "--progress");
 845         if (suc->quiet)
 846                 argv_array_push(&child->args, "--quiet");
 847         if (suc->prefix)
 848                 argv_array_pushl(&child->args, "--prefix", suc->prefix, NULL);
 849         if (suc->recommend_shallow && sub->recommend_shallow == 1)
 850                 argv_array_push(&child->args, "--depth=1");
 851         argv_array_pushl(&child->args, "--path", sub->path, NULL);
 852         argv_array_pushl(&child->args, "--name", sub->name, NULL);
 853         argv_array_pushl(&child->args, "--url", sub->url, NULL);
 854         if (suc->references.nr) {
 855                 struct string_list_item *item;
 856                 for_each_string_list_item(item, &suc->references)
 857                         argv_array_pushl(&child->args, "--reference", item->string, NULL);
 858         }
 859         if (suc->depth)
 860                 argv_array_push(&child->args, suc->depth);
 861
 862 cleanup:
 863         strbuf_reset(&displaypath_sb);
 864         strbuf_reset(&sb);
 865
 866         return needs_cloning;
 867 }
 868
 869 static int update_clone_get_next_task(struct child_process *child,
 870                                       struct strbuf *err,
 871                                       void *suc_cb,
 872                                       void **idx_task_cb)
 873 {
 874         struct submodule_update_clone *suc = suc_cb;
 875         const struct cache_entry *ce;
 876         int index;
 877
 878         for (; suc->current < suc->list.nr; suc->current++) {
 879                 ce = suc->list.entries[suc->current];
 880                 if (prepare_to_clone_next_submodule(ce, child, suc, err)) {
 881                         int *p = xmalloc(sizeof(*p));
 882                         *p = suc->current;
 883                         *idx_task_cb = p;
 884                         suc->current++;
 885                         return 1;
 886                 }
 887         }
 888
 889         /*
 890          * The loop above tried cloning each submodule once, now try the
 891          * stragglers again, which we can imagine as an extension of the
 892          * entry list.
 893          */
 894         index = suc->current - suc->list.nr;
 895         if (index < suc->failed_clones_nr) {
 896                 int *p;
 897                 ce = suc->failed_clones[index];
 898                 if (!prepare_to_clone_next_submodule(ce, child, suc, err)) {
 899                         suc->current ++;
 900                         strbuf_addstr(err, "BUG: submodule considered for "
 901                                            "cloning, doesn't need cloning "
 902                                            "any more?\n");
 903                         return 0;
 904                 }
 905                 p = xmalloc(sizeof(*p));
 906                 *p = suc->current;
 907                 *idx_task_cb = p;
 908                 suc->current ++;
 909                 return 1;
 910         }
 911
 912         return 0;
 913 }
 914
 915 static int update_clone_start_failure(struct strbuf *err,
 916                                       void *suc_cb,
 917                                       void *idx_task_cb)
 918 {
 919         struct submodule_update_clone *suc = suc_cb;
 920         suc->quickstop = 1;
 921         return 1;
 922 }
 923
 924 static int update_clone_task_finished(int result,
 925                                       struct strbuf *err,
 926                                       void *suc_cb,
 927                                       void *idx_task_cb)
 928 {
 929         const struct cache_entry *ce;
 930         struct submodule_update_clone *suc = suc_cb;
 931
 932         int *idxP = *(int**)idx_task_cb;
 933         int idx = *idxP;
 934         free(idxP);
 935
 936         if (!result)
 937                 return 0;
 938
 939         if (idx < suc->list.nr) {
 940                 ce  = suc->list.entries[idx];
 941                 strbuf_addf(err, _("Failed to clone '%s'. Retry scheduled"),
 942                             ce->name);
 943                 strbuf_addch(err, '\n');
 944                 ALLOC_GROW(suc->failed_clones,
 945                            suc->failed_clones_nr + 1,
 946                            suc->failed_clones_alloc);
 947                 suc->failed_clones[suc->failed_clones_nr++] = ce;
 948                 return 0;
 949         } else {
 950                 idx -= suc->list.nr;
 951                 ce  = suc->failed_clones[idx];
 952                 strbuf_addf(err, _("Failed to clone '%s' a second time, aborting"),
 953                             ce->name);
 954                 strbuf_addch(err, '\n');
 955                 suc->quickstop = 1;
 956                 return 1;
 957         }
 958
 959         return 0;
 960 }
 961
 962 static int update_clone(int argc, const char **argv, const char *prefix)
 963 {
 964         const char *update = NULL;
 965         int max_jobs = -1;
 966         struct string_list_item *item;
 967         struct pathspec pathspec;
 968         struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
 969
 970         struct option module_update_clone_options[] = {
 971                 OPT_STRING(0, "prefix", &prefix,
 972                            N_("path"),
 973                            N_("path into the working tree")),
 974                 OPT_STRING(0, "recursive-prefix", &suc.recursive_prefix,
 975                            N_("path"),
 976                            N_("path into the working tree, across nested "
 977                               "submodule boundaries")),
 978                 OPT_STRING(0, "update", &update,
 979                            N_("string"),
 980                            N_("rebase, merge, checkout or none")),
 981                 OPT_STRING_LIST(0, "reference", &suc.references, N_("repo"),
 982                            N_("reference repository")),
 983                 OPT_STRING(0, "depth", &suc.depth, "<depth>",
 984                            N_("Create a shallow clone truncated to the "
 985                               "specified number of revisions")),
 986                 OPT_INTEGER('j', "jobs", &max_jobs,
 987                             N_("parallel jobs")),
 988                 OPT_BOOL(0, "recommend-shallow", &suc.recommend_shallow,
 989                             N_("whether the initial clone should follow the shallow recommendation")),
 990                 OPT__QUIET(&suc.quiet, N_("don't print cloning progress")),
 991                 OPT_BOOL(0, "progress", &suc.progress,
 992                             N_("force cloning progress")),
 993                 OPT_END()
 994         };
 995
 996         const char *const git_submodule_helper_usage[] = {
 997                 N_("git submodule--helper update_clone [--prefix=<path>] [<path>...]"),
 998                 NULL
 999         };
1000         suc.prefix = prefix;
1001
1002         argc = parse_options(argc, argv, prefix, module_update_clone_options,
1003                              git_submodule_helper_usage, 0);
1004
1005         if (update)
1006                 if (parse_submodule_update_strategy(update, &suc.update) < 0)
1007                         die(_("bad value for update parameter"));
1008
1009         if (module_list_compute(argc, argv, prefix, &pathspec, &suc.list) < 0)
1010                 return 1;
1011
1012         if (pathspec.nr)
1013                 suc.warn_if_uninitialized = 1;
1014
1015         /* Overlay the parsed .gitmodules file with .git/config */
1016         gitmodules_config();
1017         git_config(submodule_config, NULL);
1018
1019         if (max_jobs < 0)
1020                 max_jobs = parallel_submodules();
1021
1022         run_processes_parallel(max_jobs,
1023                                update_clone_get_next_task,
1024                                update_clone_start_failure,
1025                                update_clone_task_finished,
1026                                &suc);
1027
1028         /*
1029          * We saved the output and put it out all at once now.
1030          * That means:
1031          * - the listener does not have to interleave their (checkout)
1032          *   work with our fetching.  The writes involved in a
1033          *   checkout involve more straightforward sequential I/O.
1034          * - the listener can avoid doing any work if fetching failed.
1035          */
1036         if (suc.quickstop)
1037                 return 1;
1038
1039         for_each_string_list_item(item, &suc.projectlines)
1040                 utf8_fprintf(stdout, "%s", item->string);
1041
1042         return 0;
1043 }
1044
1045 static int resolve_relative_path(int argc, const char **argv, const char *prefix)
1046 {
1047         struct strbuf sb = STRBUF_INIT;
1048         if (argc != 3)
1049                 die("submodule--helper relative-path takes exactly 2 arguments, got %d", argc);
1050
1051         printf("%s", relative_path(argv[1], argv[2], &sb));
1052         strbuf_release(&sb);
1053         return 0;
1054 }
1055
1056 static const char *remote_submodule_branch(const char *path)
1057 {
1058         const struct submodule *sub;
1059         gitmodules_config();
1060         git_config(submodule_config, NULL);
1061
1062         sub = submodule_from_path(null_sha1, path);
1063         if (!sub)
1064                 return NULL;
1065
1066         if (!sub->branch)
1067                 return "master";
1068
1069         if (!strcmp(sub->branch, ".")) {
1070                 unsigned char sha1[20];
1071                 const char *refname = resolve_ref_unsafe("HEAD", 0, sha1, NULL);
1072
1073                 if (!refname)
1074                         die(_("No such ref: %s"), "HEAD");
1075
1076                 /* detached HEAD */
1077                 if (!strcmp(refname, "HEAD"))
1078                         die(_("Submodule (%s) branch configured to inherit "
1079                               "branch from superproject, but the superproject "
1080                               "is not on any branch"), sub->name);
1081
1082                 if (!skip_prefix(refname, "refs/heads/", &refname))
1083                         die(_("Expecting a full ref name, got %s"), refname);
1084                 return refname;
1085         }
1086
1087         return sub->branch;
1088 }
1089
1090 static int resolve_remote_submodule_branch(int argc, const char **argv,
1091                 const char *prefix)
1092 {
1093         const char *ret;
1094         struct strbuf sb = STRBUF_INIT;
1095         if (argc != 2)
1096                 die("submodule--helper remote-branch takes exactly one arguments, got %d", argc);
1097
1098         ret = remote_submodule_branch(argv[1]);
1099         if (!ret)
1100                 die("submodule %s doesn't exist", argv[1]);
1101
1102         printf("%s", ret);
1103         strbuf_release(&sb);
1104         return 0;
1105 }
1106
1107 static int push_check(int argc, const char **argv, const char *prefix)
1108 {
1109         struct remote *remote;
1110
1111         if (argc < 2)
1112                 die("submodule--helper push-check requires at least 1 argument");
1113
1114         /*
1115          * The remote must be configured.
1116          * This is to avoid pushing to the exact same URL as the parent.
1117          */
1118         remote = pushremote_get(argv[1]);
1119         if (!remote || remote->origin == REMOTE_UNCONFIGURED)
1120                 die("remote '%s' not configured", argv[1]);
1121
1122         /* Check the refspec */
1123         if (argc > 2) {
1124                 int i, refspec_nr = argc - 2;
1125                 struct ref *local_refs = get_local_heads();
1126                 struct refspec *refspec = parse_push_refspec(refspec_nr,
1127                                                              argv + 2);
1128
1129                 for (i = 0; i < refspec_nr; i++) {
1130                         struct refspec *rs = refspec + i;
1131
1132                         if (rs->pattern || rs->matching)
1133                                 continue;
1134
1135                         /*
1136                          * LHS must match a single ref
1137                          * NEEDSWORK: add logic to special case 'HEAD' once
1138                          * working with submodules in a detached head state
1139                          * ceases to be the norm.
1140                          */
1141                         if (count_refspec_match(rs->src, local_refs, NULL) != 1)
1142                                 die("src refspec '%s' must name a ref",
1143                                     rs->src);
1144                 }
1145                 free_refspec(refspec_nr, refspec);
1146         }
1147
1148         return 0;
1149 }
1150
1151 static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
1152 {
1153         int i;
1154         struct pathspec pathspec;
1155         struct module_list list = MODULE_LIST_INIT;
1156         unsigned flags = ABSORB_GITDIR_RECURSE_SUBMODULES;
1157
1158         struct option embed_gitdir_options[] = {
1159                 OPT_STRING(0, "prefix", &prefix,
1160                            N_("path"),
1161                            N_("path into the working tree")),
1162                 OPT_BIT(0, "--recursive", &flags, N_("recurse into submodules"),
1163                         ABSORB_GITDIR_RECURSE_SUBMODULES),
1164                 OPT_END()
1165         };
1166
1167         const char *const git_submodule_helper_usage[] = {
1168                 N_("git submodule--helper embed-git-dir [<path>...]"),
1169                 NULL
1170         };
1171
1172         argc = parse_options(argc, argv, prefix, embed_gitdir_options,
1173                              git_submodule_helper_usage, 0);
1174
1175         gitmodules_config();
1176         git_config(submodule_config, NULL);
1177
1178         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1179                 return 1;
1180
1181         for (i = 0; i < list.nr; i++)
1182                 absorb_git_dir_into_superproject(prefix,
1183                                 list.entries[i]->name, flags);
1184
1185         return 0;
1186 }
1187
1188 static int is_active(int argc, const char **argv, const char *prefix)
1189 {
1190         if (argc != 2)
1191                 die("submodule--helper is-active takes exactly 1 argument");
1192
1193         gitmodules_config();
1194
1195         return !is_submodule_initialized(argv[1]);
1196 }
1197
1198 #define SUPPORT_SUPER_PREFIX (1<<0)
1199
1200 struct cmd_struct {
1201         const char *cmd;
1202         int (*fn)(int, const char **, const char *);
1203         unsigned option;
1204 };
1205
1206 static struct cmd_struct commands[] = {
1207         {"list", module_list, 0},
1208         {"name", module_name, 0},
1209         {"clone", module_clone, 0},
1210         {"update-clone", update_clone, 0},
1211         {"relative-path", resolve_relative_path, 0},
1212         {"resolve-relative-url", resolve_relative_url, 0},
1213         {"resolve-relative-url-test", resolve_relative_url_test, 0},
1214         {"init", module_init, SUPPORT_SUPER_PREFIX},
1215         {"remote-branch", resolve_remote_submodule_branch, 0},
1216         {"push-check", push_check, 0},
1217         {"absorb-git-dirs", absorb_git_dirs, SUPPORT_SUPER_PREFIX},
1218         {"is-active", is_active, 0},
1219 };
1220
1221 int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
1222 {
1223         int i;
1224         if (argc < 2)
1225                 die(_("submodule--helper subcommand must be "
1226                       "called with a subcommand"));
1227
1228         for (i = 0; i < ARRAY_SIZE(commands); i++) {
1229                 if (!strcmp(argv[1], commands[i].cmd)) {
1230                         if (get_super_prefix() &&
1231                             !(commands[i].option & SUPPORT_SUPER_PREFIX))
1232                                 die(_("%s doesn't support --super-prefix"),
1233                                     commands[i].cmd);
1234                         return commands[i].fn(argc - 1, argv + 1, prefix);
1235                 }
1236         }
1237
1238         die(_("'%s' is not a valid submodule--helper "
1239               "subcommand"), argv[1]);
1240 }