builtin/submodule--helper.c

   1 #include "builtin.h"
   2 #include "repository.h"
   3 #include "cache.h"
   4 #include "config.h"
   5 #include "parse-options.h"
   6 #include "quote.h"
   7 #include "pathspec.h"
   8 #include "dir.h"
   9 #include "submodule.h"
  10 #include "submodule-config.h"
  11 #include "string-list.h"
  12 #include "run-command.h"
  13 #include "remote.h"
  14 #include "refs.h"
  15 #include "connect.h"
  16 #include "dir.h"
  17
  18 static char *get_default_remote(void)
  19 {
  20         char *dest = NULL, *ret;
  21         unsigned char sha1[20];
  22         struct strbuf sb = STRBUF_INIT;
  23         const char *refname = resolve_ref_unsafe("HEAD", 0, sha1, NULL);
  24
  25         if (!refname)
  26                 die(_("No such ref: %s"), "HEAD");
  27
  28         /* detached HEAD */
  29         if (!strcmp(refname, "HEAD"))
  30                 return xstrdup("origin");
  31
  32         if (!skip_prefix(refname, "refs/heads/", &refname))
  33                 die(_("Expecting a full ref name, got %s"), refname);
  34
  35         strbuf_addf(&sb, "branch.%s.remote", refname);
  36         if (git_config_get_string(sb.buf, &dest))
  37                 ret = xstrdup("origin");
  38         else
  39                 ret = dest;
  40
  41         strbuf_release(&sb);
  42         return ret;
  43 }
  44
  45 static int starts_with_dot_slash(const char *str)
  46 {
  47         return str[0] == '.' && is_dir_sep(str[1]);
  48 }
  49
  50 static int starts_with_dot_dot_slash(const char *str)
  51 {
  52         return str[0] == '.' && str[1] == '.' && is_dir_sep(str[2]);
  53 }
  54
  55 /*
  56  * Returns 1 if it was the last chop before ':'.
  57  */
  58 static int chop_last_dir(char **remoteurl, int is_relative)
  59 {
  60         char *rfind = find_last_dir_sep(*remoteurl);
  61         if (rfind) {
  62                 *rfind = '\0';
  63                 return 0;
  64         }
  65
  66         rfind = strrchr(*remoteurl, ':');
  67         if (rfind) {
  68                 *rfind = '\0';
  69                 return 1;
  70         }
  71
  72         if (is_relative || !strcmp(".", *remoteurl))
  73                 die(_("cannot strip one component off url '%s'"),
  74                         *remoteurl);
  75
  76         free(*remoteurl);
  77         *remoteurl = xstrdup(".");
  78         return 0;
  79 }
  80
  81 /*
  82  * The `url` argument is the URL that navigates to the submodule origin
  83  * repo. When relative, this URL is relative to the superproject origin
  84  * URL repo. The `up_path` argument, if specified, is the relative
  85  * path that navigates from the submodule working tree to the superproject
  86  * working tree. Returns the origin URL of the submodule.
  87  *
  88  * Return either an absolute URL or filesystem path (if the superproject
  89  * origin URL is an absolute URL or filesystem path, respectively) or a
  90  * relative file system path (if the superproject origin URL is a relative
  91  * file system path).
  92  *
  93  * When the output is a relative file system path, the path is either
  94  * relative to the submodule working tree, if up_path is specified, or to
  95  * the superproject working tree otherwise.
  96  *
  97  * NEEDSWORK: This works incorrectly on the domain and protocol part.
  98  * remote_url      url              outcome          expectation
  99  * http://a.com/b  ../c             http://a.com/c   as is
 100  * http://a.com/b/ ../c             http://a.com/c   same as previous line, but
 101  *                                                   ignore trailing slash in url
 102  * http://a.com/b  ../../c          http://c         error out
 103  * http://a.com/b  ../../../c       http:/c          error out
 104  * http://a.com/b  ../../../../c    http:c           error out
 105  * http://a.com/b  ../../../../../c    .:c           error out
 106  * NEEDSWORK: Given how chop_last_dir() works, this function is broken
 107  * when a local part has a colon in its path component, too.
 108  */
 109 static char *relative_url(const char *remote_url,
 110                                 const char *url,
 111                                 const char *up_path)
 112 {
 113         int is_relative = 0;
 114         int colonsep = 0;
 115         char *out;
 116         char *remoteurl = xstrdup(remote_url);
 117         struct strbuf sb = STRBUF_INIT;
 118         size_t len = strlen(remoteurl);
 119
 120         if (is_dir_sep(remoteurl[len-1]))
 121                 remoteurl[len-1] = '\0';
 122
 123         if (!url_is_local_not_ssh(remoteurl) || is_absolute_path(remoteurl))
 124                 is_relative = 0;
 125         else {
 126                 is_relative = 1;
 127                 /*
 128                  * Prepend a './' to ensure all relative
 129                  * remoteurls start with './' or '../'
 130                  */
 131                 if (!starts_with_dot_slash(remoteurl) &&
 132                     !starts_with_dot_dot_slash(remoteurl)) {
 133                         strbuf_reset(&sb);
 134                         strbuf_addf(&sb, "./%s", remoteurl);
 135                         free(remoteurl);
 136                         remoteurl = strbuf_detach(&sb, NULL);
 137                 }
 138         }
 139         /*
 140          * When the url starts with '../', remove that and the
 141          * last directory in remoteurl.
 142          */
 143         while (url) {
 144                 if (starts_with_dot_dot_slash(url)) {
 145                         url += 3;
 146                         colonsep |= chop_last_dir(&remoteurl, is_relative);
 147                 } else if (starts_with_dot_slash(url))
 148                         url += 2;
 149                 else
 150                         break;
 151         }
 152         strbuf_reset(&sb);
 153         strbuf_addf(&sb, "%s%s%s", remoteurl, colonsep ? ":" : "/", url);
 154         if (ends_with(url, "/"))
 155                 strbuf_setlen(&sb, sb.len - 1);
 156         free(remoteurl);
 157
 158         if (starts_with_dot_slash(sb.buf))
 159                 out = xstrdup(sb.buf + 2);
 160         else
 161                 out = xstrdup(sb.buf);
 162         strbuf_reset(&sb);
 163
 164         if (!up_path || !is_relative)
 165                 return out;
 166
 167         strbuf_addf(&sb, "%s%s", up_path, out);
 168         free(out);
 169         return strbuf_detach(&sb, NULL);
 170 }
 171
 172 static int resolve_relative_url(int argc, const char **argv, const char *prefix)
 173 {
 174         char *remoteurl = NULL;
 175         char *remote = get_default_remote();
 176         const char *up_path = NULL;
 177         char *res;
 178         const char *url;
 179         struct strbuf sb = STRBUF_INIT;
 180
 181         if (argc != 2 && argc != 3)
 182                 die("resolve-relative-url only accepts one or two arguments");
 183
 184         url = argv[1];
 185         strbuf_addf(&sb, "remote.%s.url", remote);
 186         free(remote);
 187
 188         if (git_config_get_string(sb.buf, &remoteurl))
 189                 /* the repository is its own authoritative upstream */
 190                 remoteurl = xgetcwd();
 191
 192         if (argc == 3)
 193                 up_path = argv[2];
 194
 195         res = relative_url(remoteurl, url, up_path);
 196         puts(res);
 197         free(res);
 198         free(remoteurl);
 199         return 0;
 200 }
 201
 202 static int resolve_relative_url_test(int argc, const char **argv, const char *prefix)
 203 {
 204         char *remoteurl, *res;
 205         const char *up_path, *url;
 206
 207         if (argc != 4)
 208                 die("resolve-relative-url-test only accepts three arguments: <up_path> <remoteurl> <url>");
 209
 210         up_path = argv[1];
 211         remoteurl = xstrdup(argv[2]);
 212         url = argv[3];
 213
 214         if (!strcmp(up_path, "(null)"))
 215                 up_path = NULL;
 216
 217         res = relative_url(remoteurl, url, up_path);
 218         puts(res);
 219         free(res);
 220         free(remoteurl);
 221         return 0;
 222 }
 223
 224 struct module_list {
 225         const struct cache_entry **entries;
 226         int alloc, nr;
 227 };
 228 #define MODULE_LIST_INIT { NULL, 0, 0 }
 229
 230 static int module_list_compute(int argc, const char **argv,
 231                                const char *prefix,
 232                                struct pathspec *pathspec,
 233                                struct module_list *list)
 234 {
 235         int i, result = 0;
 236         char *ps_matched = NULL;
 237         parse_pathspec(pathspec, 0,
 238                        PATHSPEC_PREFER_FULL,
 239                        prefix, argv);
 240
 241         if (pathspec->nr)
 242                 ps_matched = xcalloc(pathspec->nr, 1);
 243
 244         if (read_cache() < 0)
 245                 die(_("index file corrupt"));
 246
 247         for (i = 0; i < active_nr; i++) {
 248                 const struct cache_entry *ce = active_cache[i];
 249
 250                 if (!match_pathspec(pathspec, ce->name, ce_namelen(ce),
 251                                     0, ps_matched, 1) ||
 252                     !S_ISGITLINK(ce->ce_mode))
 253                         continue;
 254
 255                 ALLOC_GROW(list->entries, list->nr + 1, list->alloc);
 256                 list->entries[list->nr++] = ce;
 257                 while (i + 1 < active_nr &&
 258                        !strcmp(ce->name, active_cache[i + 1]->name))
 259                         /*
 260                          * Skip entries with the same name in different stages
 261                          * to make sure an entry is returned only once.
 262                          */
 263                         i++;
 264         }
 265
 266         if (ps_matched && report_path_error(ps_matched, pathspec, prefix))
 267                 result = -1;
 268
 269         free(ps_matched);
 270
 271         return result;
 272 }
 273
 274 static void module_list_active(struct module_list *list)
 275 {
 276         int i;
 277         struct module_list active_modules = MODULE_LIST_INIT;
 278
 279         gitmodules_config();
 280
 281         for (i = 0; i < list->nr; i++) {
 282                 const struct cache_entry *ce = list->entries[i];
 283
 284                 if (!is_submodule_active(the_repository, ce->name))
 285                         continue;
 286
 287                 ALLOC_GROW(active_modules.entries,
 288                            active_modules.nr + 1,
 289                            active_modules.alloc);
 290                 active_modules.entries[active_modules.nr++] = ce;
 291         }
 292
 293         free(list->entries);
 294         *list = active_modules;
 295 }
 296
 297 static int module_list(int argc, const char **argv, const char *prefix)
 298 {
 299         int i;
 300         struct pathspec pathspec;
 301         struct module_list list = MODULE_LIST_INIT;
 302
 303         struct option module_list_options[] = {
 304                 OPT_STRING(0, "prefix", &prefix,
 305                            N_("path"),
 306                            N_("alternative anchor for relative paths")),
 307                 OPT_END()
 308         };
 309
 310         const char *const git_submodule_helper_usage[] = {
 311                 N_("git submodule--helper list [--prefix=<path>] [<path>...]"),
 312                 NULL
 313         };
 314
 315         argc = parse_options(argc, argv, prefix, module_list_options,
 316                              git_submodule_helper_usage, 0);
 317
 318         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 319                 return 1;
 320
 321         for (i = 0; i < list.nr; i++) {
 322                 const struct cache_entry *ce = list.entries[i];
 323
 324                 if (ce_stage(ce))
 325                         printf("%06o %s U\t", ce->ce_mode, sha1_to_hex(null_sha1));
 326                 else
 327                         printf("%06o %s %d\t", ce->ce_mode,
 328                                oid_to_hex(&ce->oid), ce_stage(ce));
 329
 330                 fprintf(stdout, "%s\n", ce->name);
 331         }
 332         return 0;
 333 }
 334
 335 static void init_submodule(const char *path, const char *prefix, int quiet)
 336 {
 337         const struct submodule *sub;
 338         struct strbuf sb = STRBUF_INIT;
 339         char *upd = NULL, *url = NULL, *displaypath;
 340
 341         /* Only loads from .gitmodules, no overlay with .git/config */
 342         gitmodules_config();
 343
 344         if (prefix && get_super_prefix())
 345                 die("BUG: cannot have prefix and superprefix");
 346         else if (prefix)
 347                 displaypath = xstrdup(relative_path(path, prefix, &sb));
 348         else if (get_super_prefix()) {
 349                 strbuf_addf(&sb, "%s%s", get_super_prefix(), path);
 350                 displaypath = strbuf_detach(&sb, NULL);
 351         } else
 352                 displaypath = xstrdup(path);
 353
 354         sub = submodule_from_path(null_sha1, path);
 355
 356         if (!sub)
 357                 die(_("No url found for submodule path '%s' in .gitmodules"),
 358                         displaypath);
 359
 360         /*
 361          * NEEDSWORK: In a multi-working-tree world, this needs to be
 362          * set in the per-worktree config.
 363          *
 364          * Set active flag for the submodule being initialized
 365          */
 366         if (!is_submodule_active(the_repository, path)) {
 367                 strbuf_reset(&sb);
 368                 strbuf_addf(&sb, "submodule.%s.active", sub->name);
 369                 git_config_set_gently(sb.buf, "true");
 370         }
 371
 372         /*
 373          * Copy url setting when it is not set yet.
 374          * To look up the url in .git/config, we must not fall back to
 375          * .gitmodules, so look it up directly.
 376          */
 377         strbuf_reset(&sb);
 378         strbuf_addf(&sb, "submodule.%s.url", sub->name);
 379         if (git_config_get_string(sb.buf, &url)) {
 380                 if (!sub->url)
 381                         die(_("No url found for submodule path '%s' in .gitmodules"),
 382                                 displaypath);
 383
 384                 url = xstrdup(sub->url);
 385
 386                 /* Possibly a url relative to parent */
 387                 if (starts_with_dot_dot_slash(url) ||
 388                     starts_with_dot_slash(url)) {
 389                         char *remoteurl, *relurl;
 390                         char *remote = get_default_remote();
 391                         struct strbuf remotesb = STRBUF_INIT;
 392                         strbuf_addf(&remotesb, "remote.%s.url", remote);
 393                         free(remote);
 394
 395                         if (git_config_get_string(remotesb.buf, &remoteurl)) {
 396                                 warning(_("could not lookup configuration '%s'. Assuming this repository is its own authoritative upstream."), remotesb.buf);
 397                                 remoteurl = xgetcwd();
 398                         }
 399                         relurl = relative_url(remoteurl, url, NULL);
 400                         strbuf_release(&remotesb);
 401                         free(remoteurl);
 402                         free(url);
 403                         url = relurl;
 404                 }
 405
 406                 if (git_config_set_gently(sb.buf, url))
 407                         die(_("Failed to register url for submodule path '%s'"),
 408                             displaypath);
 409                 if (!quiet)
 410                         fprintf(stderr,
 411                                 _("Submodule '%s' (%s) registered for path '%s'\n"),
 412                                 sub->name, url, displaypath);
 413         }
 414
 415         /* Copy "update" setting when it is not set yet */
 416         strbuf_reset(&sb);
 417         strbuf_addf(&sb, "submodule.%s.update", sub->name);
 418         if (git_config_get_string(sb.buf, &upd) &&
 419             sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
 420                 if (sub->update_strategy.type == SM_UPDATE_COMMAND) {
 421                         fprintf(stderr, _("warning: command update mode suggested for submodule '%s'\n"),
 422                                 sub->name);
 423                         upd = xstrdup("none");
 424                 } else
 425                         upd = xstrdup(submodule_strategy_to_string(&sub->update_strategy));
 426
 427                 if (git_config_set_gently(sb.buf, upd))
 428                         die(_("Failed to register update mode for submodule path '%s'"), displaypath);
 429         }
 430         strbuf_release(&sb);
 431         free(displaypath);
 432         free(url);
 433         free(upd);
 434 }
 435
 436 static int module_init(int argc, const char **argv, const char *prefix)
 437 {
 438         struct pathspec pathspec;
 439         struct module_list list = MODULE_LIST_INIT;
 440         int quiet = 0;
 441         int i;
 442
 443         struct option module_init_options[] = {
 444                 OPT__QUIET(&quiet, N_("Suppress output for initializing a submodule")),
 445                 OPT_END()
 446         };
 447
 448         const char *const git_submodule_helper_usage[] = {
 449                 N_("git submodule--helper init [<path>]"),
 450                 NULL
 451         };
 452
 453         argc = parse_options(argc, argv, prefix, module_init_options,
 454                              git_submodule_helper_usage, 0);
 455
 456         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 457                 return 1;
 458
 459         /*
 460          * If there are no path args and submodule.active is set then,
 461          * by default, only initialize 'active' modules.
 462          */
 463         if (!argc && git_config_get_value_multi("submodule.active"))
 464                 module_list_active(&list);
 465
 466         for (i = 0; i < list.nr; i++)
 467                 init_submodule(list.entries[i]->name, prefix, quiet);
 468
 469         return 0;
 470 }
 471
 472 static int module_name(int argc, const char **argv, const char *prefix)
 473 {
 474         const struct submodule *sub;
 475
 476         if (argc != 2)
 477                 usage(_("git submodule--helper name <path>"));
 478
 479         gitmodules_config();
 480         sub = submodule_from_path(null_sha1, argv[1]);
 481
 482         if (!sub)
 483                 die(_("no submodule mapping found in .gitmodules for path '%s'"),
 484                     argv[1]);
 485
 486         printf("%s\n", sub->name);
 487
 488         return 0;
 489 }
 490
 491 static int clone_submodule(const char *path, const char *gitdir, const char *url,
 492                            const char *depth, struct string_list *reference,
 493                            int quiet, int progress)
 494 {
 495         struct child_process cp = CHILD_PROCESS_INIT;
 496
 497         argv_array_push(&cp.args, "clone");
 498         argv_array_push(&cp.args, "--no-checkout");
 499         if (quiet)
 500                 argv_array_push(&cp.args, "--quiet");
 501         if (progress)
 502                 argv_array_push(&cp.args, "--progress");
 503         if (depth && *depth)
 504                 argv_array_pushl(&cp.args, "--depth", depth, NULL);
 505         if (reference->nr) {
 506                 struct string_list_item *item;
 507                 for_each_string_list_item(item, reference)
 508                         argv_array_pushl(&cp.args, "--reference",
 509                                          item->string, NULL);
 510         }
 511         if (gitdir && *gitdir)
 512                 argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
 513
 514         argv_array_push(&cp.args, "--");
 515         argv_array_push(&cp.args, url);
 516         argv_array_push(&cp.args, path);
 517
 518         cp.git_cmd = 1;
 519         prepare_submodule_repo_env(&cp.env_array);
 520         cp.no_stdin = 1;
 521
 522         return run_command(&cp);
 523 }
 524
 525 struct submodule_alternate_setup {
 526         const char *submodule_name;
 527         enum SUBMODULE_ALTERNATE_ERROR_MODE {
 528                 SUBMODULE_ALTERNATE_ERROR_DIE,
 529                 SUBMODULE_ALTERNATE_ERROR_INFO,
 530                 SUBMODULE_ALTERNATE_ERROR_IGNORE
 531         } error_mode;
 532         struct string_list *reference;
 533 };
 534 #define SUBMODULE_ALTERNATE_SETUP_INIT { NULL, \
 535         SUBMODULE_ALTERNATE_ERROR_IGNORE, NULL }
 536
 537 static int add_possible_reference_from_superproject(
 538                 struct alternate_object_database *alt, void *sas_cb)
 539 {
 540         struct submodule_alternate_setup *sas = sas_cb;
 541
 542         /*
 543          * If the alternate object store is another repository, try the
 544          * standard layout with .git/(modules/<name>)+/objects
 545          */
 546         if (ends_with(alt->path, "/objects")) {
 547                 char *sm_alternate;
 548                 struct strbuf sb = STRBUF_INIT;
 549                 struct strbuf err = STRBUF_INIT;
 550                 strbuf_add(&sb, alt->path, strlen(alt->path) - strlen("objects"));
 551
 552                 /*
 553                  * We need to end the new path with '/' to mark it as a dir,
 554                  * otherwise a submodule name containing '/' will be broken
 555                  * as the last part of a missing submodule reference would
 556                  * be taken as a file name.
 557                  */
 558                 strbuf_addf(&sb, "modules/%s/", sas->submodule_name);
 559
 560                 sm_alternate = compute_alternate_path(sb.buf, &err);
 561                 if (sm_alternate) {
 562                         string_list_append(sas->reference, xstrdup(sb.buf));
 563                         free(sm_alternate);
 564                 } else {
 565                         switch (sas->error_mode) {
 566                         case SUBMODULE_ALTERNATE_ERROR_DIE:
 567                                 die(_("submodule '%s' cannot add alternate: %s"),
 568                                     sas->submodule_name, err.buf);
 569                         case SUBMODULE_ALTERNATE_ERROR_INFO:
 570                                 fprintf(stderr, _("submodule '%s' cannot add alternate: %s"),
 571                                         sas->submodule_name, err.buf);
 572                         case SUBMODULE_ALTERNATE_ERROR_IGNORE:
 573                                 ; /* nothing */
 574                         }
 575                 }
 576                 strbuf_release(&sb);
 577         }
 578
 579         return 0;
 580 }
 581
 582 static void prepare_possible_alternates(const char *sm_name,
 583                 struct string_list *reference)
 584 {
 585         char *sm_alternate = NULL, *error_strategy = NULL;
 586         struct submodule_alternate_setup sas = SUBMODULE_ALTERNATE_SETUP_INIT;
 587
 588         git_config_get_string("submodule.alternateLocation", &sm_alternate);
 589         if (!sm_alternate)
 590                 return;
 591
 592         git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
 593
 594         if (!error_strategy)
 595                 error_strategy = xstrdup("die");
 596
 597         sas.submodule_name = sm_name;
 598         sas.reference = reference;
 599         if (!strcmp(error_strategy, "die"))
 600                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_DIE;
 601         else if (!strcmp(error_strategy, "info"))
 602                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_INFO;
 603         else if (!strcmp(error_strategy, "ignore"))
 604                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_IGNORE;
 605         else
 606                 die(_("Value '%s' for submodule.alternateErrorStrategy is not recognized"), error_strategy);
 607
 608         if (!strcmp(sm_alternate, "superproject"))
 609                 foreach_alt_odb(add_possible_reference_from_superproject, &sas);
 610         else if (!strcmp(sm_alternate, "no"))
 611                 ; /* do nothing */
 612         else
 613                 die(_("Value '%s' for submodule.alternateLocation is not recognized"), sm_alternate);
 614
 615         free(sm_alternate);
 616         free(error_strategy);
 617 }
 618
 619 static int module_clone(int argc, const char **argv, const char *prefix)
 620 {
 621         const char *name = NULL, *url = NULL, *depth = NULL;
 622         int quiet = 0;
 623         int progress = 0;
 624         char *p, *path = NULL, *sm_gitdir;
 625         struct strbuf sb = STRBUF_INIT;
 626         struct string_list reference = STRING_LIST_INIT_NODUP;
 627         int require_init = 0;
 628         char *sm_alternate = NULL, *error_strategy = NULL;
 629
 630         struct option module_clone_options[] = {
 631                 OPT_STRING(0, "prefix", &prefix,
 632                            N_("path"),
 633                            N_("alternative anchor for relative paths")),
 634                 OPT_STRING(0, "path", &path,
 635                            N_("path"),
 636                            N_("where the new submodule will be cloned to")),
 637                 OPT_STRING(0, "name", &name,
 638                            N_("string"),
 639                            N_("name of the new submodule")),
 640                 OPT_STRING(0, "url", &url,
 641                            N_("string"),
 642                            N_("url where to clone the submodule from")),
 643                 OPT_STRING_LIST(0, "reference", &reference,
 644                            N_("repo"),
 645                            N_("reference repository")),
 646                 OPT_STRING(0, "depth", &depth,
 647                            N_("string"),
 648                            N_("depth for shallow clones")),
 649                 OPT__QUIET(&quiet, "Suppress output for cloning a submodule"),
 650                 OPT_BOOL(0, "progress", &progress,
 651                            N_("force cloning progress")),
 652                 OPT_BOOL(0, "require-init", &require_init,
 653                            N_("disallow cloning into non-empty directory")),
 654                 OPT_END()
 655         };
 656
 657         const char *const git_submodule_helper_usage[] = {
 658                 N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
 659                    "[--reference <repository>] [--name <name>] [--depth <depth>] "
 660                    "--url <url> --path <path>"),
 661                 NULL
 662         };
 663
 664         argc = parse_options(argc, argv, prefix, module_clone_options,
 665                              git_submodule_helper_usage, 0);
 666
 667         if (argc || !url || !path || !*path)
 668                 usage_with_options(git_submodule_helper_usage,
 669                                    module_clone_options);
 670
 671         strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
 672         sm_gitdir = absolute_pathdup(sb.buf);
 673         strbuf_reset(&sb);
 674
 675         if (!is_absolute_path(path)) {
 676                 strbuf_addf(&sb, "%s/%s", get_git_work_tree(), path);
 677                 path = strbuf_detach(&sb, NULL);
 678         } else
 679                 path = xstrdup(path);
 680
 681         if (validate_submodule_git_dir(sm_gitdir, name) < 0)
 682                 die(_("refusing to create/use '%s' in another submodule's "
 683                         "git dir"), sm_gitdir);
 684
 685         if (!file_exists(sm_gitdir)) {
 686                 if (safe_create_leading_directories_const(sm_gitdir) < 0)
 687                         die(_("could not create directory '%s'"), sm_gitdir);
 688
 689                 prepare_possible_alternates(name, &reference);
 690
 691                 if (clone_submodule(path, sm_gitdir, url, depth, &reference,
 692                                     quiet, progress))
 693                         die(_("clone of '%s' into submodule path '%s' failed"),
 694                             url, path);
 695         } else {
 696                 if (require_init && !access(path, X_OK) && !is_empty_dir(path))
 697                         die(_("directory not empty: '%s'"), path);
 698                 if (safe_create_leading_directories_const(path) < 0)
 699                         die(_("could not create directory '%s'"), path);
 700                 strbuf_addf(&sb, "%s/index", sm_gitdir);
 701                 unlink_or_warn(sb.buf);
 702                 strbuf_reset(&sb);
 703         }
 704
 705         /* Connect module worktree and git dir */
 706         connect_work_tree_and_git_dir(path, sm_gitdir);
 707
 708         p = git_pathdup_submodule(path, "config");
 709         if (!p)
 710                 die(_("could not get submodule directory for '%s'"), path);
 711
 712         /* setup alternateLocation and alternateErrorStrategy in the cloned submodule if needed */
 713         git_config_get_string("submodule.alternateLocation", &sm_alternate);
 714         if (sm_alternate)
 715                 git_config_set_in_file(p, "submodule.alternateLocation",
 716                                            sm_alternate);
 717         git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
 718         if (error_strategy)
 719                 git_config_set_in_file(p, "submodule.alternateErrorStrategy",
 720                                            error_strategy);
 721
 722         free(sm_alternate);
 723         free(error_strategy);
 724
 725         strbuf_release(&sb);
 726         free(sm_gitdir);
 727         free(path);
 728         free(p);
 729         return 0;
 730 }
 731
 732 struct submodule_update_clone {
 733         /* index into 'list', the list of submodules to look into for cloning */
 734         int current;
 735         struct module_list list;
 736         unsigned warn_if_uninitialized : 1;
 737
 738         /* update parameter passed via commandline */
 739         struct submodule_update_strategy update;
 740
 741         /* configuration parameters which are passed on to the children */
 742         int progress;
 743         int quiet;
 744         int recommend_shallow;
 745         struct string_list references;
 746         unsigned require_init;
 747         const char *depth;
 748         const char *recursive_prefix;
 749         const char *prefix;
 750
 751         /* Machine-readable status lines to be consumed by git-submodule.sh */
 752         struct string_list projectlines;
 753
 754         /* If we want to stop as fast as possible and return an error */
 755         unsigned quickstop : 1;
 756
 757         /* failed clones to be retried again */
 758         const struct cache_entry **failed_clones;
 759         int failed_clones_nr, failed_clones_alloc;
 760 };
 761 #define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
 762         SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, 0, \
 763         NULL, NULL, NULL, \
 764         STRING_LIST_INIT_DUP, 0, NULL, 0, 0}
 765
 766
 767 static void next_submodule_warn_missing(struct submodule_update_clone *suc,
 768                 struct strbuf *out, const char *displaypath)
 769 {
 770         /*
 771          * Only mention uninitialized submodules when their
 772          * paths have been specified.
 773          */
 774         if (suc->warn_if_uninitialized) {
 775                 strbuf_addf(out,
 776                         _("Submodule path '%s' not initialized"),
 777                         displaypath);
 778                 strbuf_addch(out, '\n');
 779                 strbuf_addstr(out,
 780                         _("Maybe you want to use 'update --init'?"));
 781                 strbuf_addch(out, '\n');
 782         }
 783 }
 784
 785 /**
 786  * Determine whether 'ce' needs to be cloned. If so, prepare the 'child' to
 787  * run the clone. Returns 1 if 'ce' needs to be cloned, 0 otherwise.
 788  */
 789 static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
 790                                            struct child_process *child,
 791                                            struct submodule_update_clone *suc,
 792                                            struct strbuf *out)
 793 {
 794         const struct submodule *sub = NULL;
 795         struct strbuf displaypath_sb = STRBUF_INIT;
 796         struct strbuf sb = STRBUF_INIT;
 797         const char *displaypath = NULL;
 798         int needs_cloning = 0;
 799
 800         if (ce_stage(ce)) {
 801                 if (suc->recursive_prefix)
 802                         strbuf_addf(&sb, "%s/%s", suc->recursive_prefix, ce->name);
 803                 else
 804                         strbuf_addstr(&sb, ce->name);
 805                 strbuf_addf(out, _("Skipping unmerged submodule %s"), sb.buf);
 806                 strbuf_addch(out, '\n');
 807                 goto cleanup;
 808         }
 809
 810         sub = submodule_from_path(null_sha1, ce->name);
 811
 812         if (suc->recursive_prefix)
 813                 displaypath = relative_path(suc->recursive_prefix,
 814                                             ce->name, &displaypath_sb);
 815         else
 816                 displaypath = ce->name;
 817
 818         if (!sub) {
 819                 next_submodule_warn_missing(suc, out, displaypath);
 820                 goto cleanup;
 821         }
 822
 823         if (suc->update.type == SM_UPDATE_NONE
 824             || (suc->update.type == SM_UPDATE_UNSPECIFIED
 825                 && sub->update_strategy.type == SM_UPDATE_NONE)) {
 826                 strbuf_addf(out, _("Skipping submodule '%s'"), displaypath);
 827                 strbuf_addch(out, '\n');
 828                 goto cleanup;
 829         }
 830
 831         /* Check if the submodule has been initialized. */
 832         if (!is_submodule_active(the_repository, ce->name)) {
 833                 next_submodule_warn_missing(suc, out, displaypath);
 834                 goto cleanup;
 835         }
 836
 837         strbuf_reset(&sb);
 838         strbuf_addf(&sb, "%s/.git", ce->name);
 839         needs_cloning = !file_exists(sb.buf);
 840
 841         strbuf_reset(&sb);
 842         strbuf_addf(&sb, "%06o %s %d %d\t%s\n", ce->ce_mode,
 843                         oid_to_hex(&ce->oid), ce_stage(ce),
 844                         needs_cloning, ce->name);
 845         string_list_append(&suc->projectlines, sb.buf);
 846
 847         if (!needs_cloning)
 848                 goto cleanup;
 849
 850         child->git_cmd = 1;
 851         child->no_stdin = 1;
 852         child->stdout_to_stderr = 1;
 853         child->err = -1;
 854         argv_array_push(&child->args, "submodule--helper");
 855         argv_array_push(&child->args, "clone");
 856         if (suc->progress)
 857                 argv_array_push(&child->args, "--progress");
 858         if (suc->quiet)
 859                 argv_array_push(&child->args, "--quiet");
 860         if (suc->prefix)
 861                 argv_array_pushl(&child->args, "--prefix", suc->prefix, NULL);
 862         if (suc->recommend_shallow && sub->recommend_shallow == 1)
 863                 argv_array_push(&child->args, "--depth=1");
 864         if (suc->require_init)
 865                 argv_array_push(&child->args, "--require-init");
 866         argv_array_pushl(&child->args, "--path", sub->path, NULL);
 867         argv_array_pushl(&child->args, "--name", sub->name, NULL);
 868         argv_array_pushl(&child->args, "--url", sub->url, NULL);
 869         if (suc->references.nr) {
 870                 struct string_list_item *item;
 871                 for_each_string_list_item(item, &suc->references)
 872                         argv_array_pushl(&child->args, "--reference", item->string, NULL);
 873         }
 874         if (suc->depth)
 875                 argv_array_push(&child->args, suc->depth);
 876
 877 cleanup:
 878         strbuf_reset(&displaypath_sb);
 879         strbuf_reset(&sb);
 880
 881         return needs_cloning;
 882 }
 883
 884 static int update_clone_get_next_task(struct child_process *child,
 885                                       struct strbuf *err,
 886                                       void *suc_cb,
 887                                       void **idx_task_cb)
 888 {
 889         struct submodule_update_clone *suc = suc_cb;
 890         const struct cache_entry *ce;
 891         int index;
 892
 893         for (; suc->current < suc->list.nr; suc->current++) {
 894                 ce = suc->list.entries[suc->current];
 895                 if (prepare_to_clone_next_submodule(ce, child, suc, err)) {
 896                         int *p = xmalloc(sizeof(*p));
 897                         *p = suc->current;
 898                         *idx_task_cb = p;
 899                         suc->current++;
 900                         return 1;
 901                 }
 902         }
 903
 904         /*
 905          * The loop above tried cloning each submodule once, now try the
 906          * stragglers again, which we can imagine as an extension of the
 907          * entry list.
 908          */
 909         index = suc->current - suc->list.nr;
 910         if (index < suc->failed_clones_nr) {
 911                 int *p;
 912                 ce = suc->failed_clones[index];
 913                 if (!prepare_to_clone_next_submodule(ce, child, suc, err)) {
 914                         suc->current ++;
 915                         strbuf_addstr(err, "BUG: submodule considered for "
 916                                            "cloning, doesn't need cloning "
 917                                            "any more?\n");
 918                         return 0;
 919                 }
 920                 p = xmalloc(sizeof(*p));
 921                 *p = suc->current;
 922                 *idx_task_cb = p;
 923                 suc->current ++;
 924                 return 1;
 925         }
 926
 927         return 0;
 928 }
 929
 930 static int update_clone_start_failure(struct strbuf *err,
 931                                       void *suc_cb,
 932                                       void *idx_task_cb)
 933 {
 934         struct submodule_update_clone *suc = suc_cb;
 935         suc->quickstop = 1;
 936         return 1;
 937 }
 938
 939 static int update_clone_task_finished(int result,
 940                                       struct strbuf *err,
 941                                       void *suc_cb,
 942                                       void *idx_task_cb)
 943 {
 944         const struct cache_entry *ce;
 945         struct submodule_update_clone *suc = suc_cb;
 946
 947         int *idxP = idx_task_cb;
 948         int idx = *idxP;
 949         free(idxP);
 950
 951         if (!result)
 952                 return 0;
 953
 954         if (idx < suc->list.nr) {
 955                 ce  = suc->list.entries[idx];
 956                 strbuf_addf(err, _("Failed to clone '%s'. Retry scheduled"),
 957                             ce->name);
 958                 strbuf_addch(err, '\n');
 959                 ALLOC_GROW(suc->failed_clones,
 960                            suc->failed_clones_nr + 1,
 961                            suc->failed_clones_alloc);
 962                 suc->failed_clones[suc->failed_clones_nr++] = ce;
 963                 return 0;
 964         } else {
 965                 idx -= suc->list.nr;
 966                 ce  = suc->failed_clones[idx];
 967                 strbuf_addf(err, _("Failed to clone '%s' a second time, aborting"),
 968                             ce->name);
 969                 strbuf_addch(err, '\n');
 970                 suc->quickstop = 1;
 971                 return 1;
 972         }
 973
 974         return 0;
 975 }
 976
 977 static int update_clone(int argc, const char **argv, const char *prefix)
 978 {
 979         const char *update = NULL;
 980         int max_jobs = -1;
 981         struct string_list_item *item;
 982         struct pathspec pathspec;
 983         struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
 984
 985         struct option module_update_clone_options[] = {
 986                 OPT_STRING(0, "prefix", &prefix,
 987                            N_("path"),
 988                            N_("path into the working tree")),
 989                 OPT_STRING(0, "recursive-prefix", &suc.recursive_prefix,
 990                            N_("path"),
 991                            N_("path into the working tree, across nested "
 992                               "submodule boundaries")),
 993                 OPT_STRING(0, "update", &update,
 994                            N_("string"),
 995                            N_("rebase, merge, checkout or none")),
 996                 OPT_STRING_LIST(0, "reference", &suc.references, N_("repo"),
 997                            N_("reference repository")),
 998                 OPT_STRING(0, "depth", &suc.depth, "<depth>",
 999                            N_("Create a shallow clone truncated to the "
1000                               "specified number of revisions")),
1001                 OPT_INTEGER('j', "jobs", &max_jobs,
1002                             N_("parallel jobs")),
1003                 OPT_BOOL(0, "recommend-shallow", &suc.recommend_shallow,
1004                             N_("whether the initial clone should follow the shallow recommendation")),
1005                 OPT__QUIET(&suc.quiet, N_("don't print cloning progress")),
1006                 OPT_BOOL(0, "progress", &suc.progress,
1007                             N_("force cloning progress")),
1008                 OPT_BOOL(0, "require-init", &suc.require_init,
1009                            N_("disallow cloning into non-empty directory")),
1010                 OPT_END()
1011         };
1012
1013         const char *const git_submodule_helper_usage[] = {
1014                 N_("git submodule--helper update_clone [--prefix=<path>] [<path>...]"),
1015                 NULL
1016         };
1017         suc.prefix = prefix;
1018
1019         argc = parse_options(argc, argv, prefix, module_update_clone_options,
1020                              git_submodule_helper_usage, 0);
1021
1022         if (update)
1023                 if (parse_submodule_update_strategy(update, &suc.update) < 0)
1024                         die(_("bad value for update parameter"));
1025
1026         if (module_list_compute(argc, argv, prefix, &pathspec, &suc.list) < 0)
1027                 return 1;
1028
1029         if (pathspec.nr)
1030                 suc.warn_if_uninitialized = 1;
1031
1032         /* Overlay the parsed .gitmodules file with .git/config */
1033         gitmodules_config();
1034         git_config(submodule_config, NULL);
1035
1036         if (max_jobs < 0)
1037                 max_jobs = parallel_submodules();
1038
1039         run_processes_parallel(max_jobs,
1040                                update_clone_get_next_task,
1041                                update_clone_start_failure,
1042                                update_clone_task_finished,
1043                                &suc);
1044
1045         /*
1046          * We saved the output and put it out all at once now.
1047          * That means:
1048          * - the listener does not have to interleave their (checkout)
1049          *   work with our fetching.  The writes involved in a
1050          *   checkout involve more straightforward sequential I/O.
1051          * - the listener can avoid doing any work if fetching failed.
1052          */
1053         if (suc.quickstop)
1054                 return 1;
1055
1056         for_each_string_list_item(item, &suc.projectlines)
1057                 fprintf(stdout, "%s", item->string);
1058
1059         return 0;
1060 }
1061
1062 static int resolve_relative_path(int argc, const char **argv, const char *prefix)
1063 {
1064         struct strbuf sb = STRBUF_INIT;
1065         if (argc != 3)
1066                 die("submodule--helper relative-path takes exactly 2 arguments, got %d", argc);
1067
1068         printf("%s", relative_path(argv[1], argv[2], &sb));
1069         strbuf_release(&sb);
1070         return 0;
1071 }
1072
1073 static const char *remote_submodule_branch(const char *path)
1074 {
1075         const struct submodule *sub;
1076         gitmodules_config();
1077         git_config(submodule_config, NULL);
1078
1079         sub = submodule_from_path(null_sha1, path);
1080         if (!sub)
1081                 return NULL;
1082
1083         if (!sub->branch)
1084                 return "master";
1085
1086         if (!strcmp(sub->branch, ".")) {
1087                 unsigned char sha1[20];
1088                 const char *refname = resolve_ref_unsafe("HEAD", 0, sha1, NULL);
1089
1090                 if (!refname)
1091                         die(_("No such ref: %s"), "HEAD");
1092
1093                 /* detached HEAD */
1094                 if (!strcmp(refname, "HEAD"))
1095                         die(_("Submodule (%s) branch configured to inherit "
1096                               "branch from superproject, but the superproject "
1097                               "is not on any branch"), sub->name);
1098
1099                 if (!skip_prefix(refname, "refs/heads/", &refname))
1100                         die(_("Expecting a full ref name, got %s"), refname);
1101                 return refname;
1102         }
1103
1104         return sub->branch;
1105 }
1106
1107 static int resolve_remote_submodule_branch(int argc, const char **argv,
1108                 const char *prefix)
1109 {
1110         const char *ret;
1111         struct strbuf sb = STRBUF_INIT;
1112         if (argc != 2)
1113                 die("submodule--helper remote-branch takes exactly one arguments, got %d", argc);
1114
1115         ret = remote_submodule_branch(argv[1]);
1116         if (!ret)
1117                 die("submodule %s doesn't exist", argv[1]);
1118
1119         printf("%s", ret);
1120         strbuf_release(&sb);
1121         return 0;
1122 }
1123
1124 static int push_check(int argc, const char **argv, const char *prefix)
1125 {
1126         struct remote *remote;
1127         const char *superproject_head;
1128         char *head;
1129         int detached_head = 0;
1130         struct object_id head_oid;
1131
1132         if (argc < 3)
1133                 die("submodule--helper push-check requires at least 2 arguments");
1134
1135         /*
1136          * superproject's resolved head ref.
1137          * if HEAD then the superproject is in a detached head state, otherwise
1138          * it will be the resolved head ref.
1139          */
1140         superproject_head = argv[1];
1141         argv++;
1142         argc--;
1143         /* Get the submodule's head ref and determine if it is detached */
1144         head = resolve_refdup("HEAD", 0, head_oid.hash, NULL);
1145         if (!head)
1146                 die(_("Failed to resolve HEAD as a valid ref."));
1147         if (!strcmp(head, "HEAD"))
1148                 detached_head = 1;
1149
1150         /*
1151          * The remote must be configured.
1152          * This is to avoid pushing to the exact same URL as the parent.
1153          */
1154         remote = pushremote_get(argv[1]);
1155         if (!remote || remote->origin == REMOTE_UNCONFIGURED)
1156                 die("remote '%s' not configured", argv[1]);
1157
1158         /* Check the refspec */
1159         if (argc > 2) {
1160                 int i, refspec_nr = argc - 2;
1161                 struct ref *local_refs = get_local_heads();
1162                 struct refspec *refspec = parse_push_refspec(refspec_nr,
1163                                                              argv + 2);
1164
1165                 for (i = 0; i < refspec_nr; i++) {
1166                         struct refspec *rs = refspec + i;
1167
1168                         if (rs->pattern || rs->matching)
1169                                 continue;
1170
1171                         /* LHS must match a single ref */
1172                         switch (count_refspec_match(rs->src, local_refs, NULL)) {
1173                         case 1:
1174                                 break;
1175                         case 0:
1176                                 /*
1177                                  * If LHS matches 'HEAD' then we need to ensure
1178                                  * that it matches the same named branch
1179                                  * checked out in the superproject.
1180                                  */
1181                                 if (!strcmp(rs->src, "HEAD")) {
1182                                         if (!detached_head &&
1183                                             !strcmp(head, superproject_head))
1184                                                 break;
1185                                         die("HEAD does not match the named branch in the superproject");
1186                                 }
1187                         default:
1188                                 die("src refspec '%s' must name a ref",
1189                                     rs->src);
1190                         }
1191                 }
1192                 free_refspec(refspec_nr, refspec);
1193         }
1194         free(head);
1195
1196         return 0;
1197 }
1198
1199 static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
1200 {
1201         int i;
1202         struct pathspec pathspec;
1203         struct module_list list = MODULE_LIST_INIT;
1204         unsigned flags = ABSORB_GITDIR_RECURSE_SUBMODULES;
1205
1206         struct option embed_gitdir_options[] = {
1207                 OPT_STRING(0, "prefix", &prefix,
1208                            N_("path"),
1209                            N_("path into the working tree")),
1210                 OPT_BIT(0, "--recursive", &flags, N_("recurse into submodules"),
1211                         ABSORB_GITDIR_RECURSE_SUBMODULES),
1212                 OPT_END()
1213         };
1214
1215         const char *const git_submodule_helper_usage[] = {
1216                 N_("git submodule--helper embed-git-dir [<path>...]"),
1217                 NULL
1218         };
1219
1220         argc = parse_options(argc, argv, prefix, embed_gitdir_options,
1221                              git_submodule_helper_usage, 0);
1222
1223         gitmodules_config();
1224         git_config(submodule_config, NULL);
1225
1226         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1227                 return 1;
1228
1229         for (i = 0; i < list.nr; i++)
1230                 absorb_git_dir_into_superproject(prefix,
1231                                 list.entries[i]->name, flags);
1232
1233         return 0;
1234 }
1235
1236 static int is_active(int argc, const char **argv, const char *prefix)
1237 {
1238         if (argc != 2)
1239                 die("submodule--helper is-active takes exactly 1 argument");
1240
1241         gitmodules_config();
1242
1243         return !is_submodule_active(the_repository, argv[1]);
1244 }
1245
1246 /*
1247  * Exit non-zero if any of the submodule names given on the command line is
1248  * invalid. If no names are given, filter stdin to print only valid names
1249  * (which is primarily intended for testing).
1250  */
1251 static int check_name(int argc, const char **argv, const char *prefix)
1252 {
1253         if (argc > 1) {
1254                 while (*++argv) {
1255                         if (check_submodule_name(*argv) < 0)
1256                                 return 1;
1257                 }
1258         } else {
1259                 struct strbuf buf = STRBUF_INIT;
1260                 while (strbuf_getline(&buf, stdin) != EOF) {
1261                         if (!check_submodule_name(buf.buf))
1262                                 printf("%s\n", buf.buf);
1263                 }
1264                 strbuf_release(&buf);
1265         }
1266         return 0;
1267 }
1268
1269 #define SUPPORT_SUPER_PREFIX (1<<0)
1270
1271 struct cmd_struct {
1272         const char *cmd;
1273         int (*fn)(int, const char **, const char *);
1274         unsigned option;
1275 };
1276
1277 static struct cmd_struct commands[] = {
1278         {"list", module_list, 0},
1279         {"name", module_name, 0},
1280         {"clone", module_clone, 0},
1281         {"update-clone", update_clone, 0},
1282         {"relative-path", resolve_relative_path, 0},
1283         {"resolve-relative-url", resolve_relative_url, 0},
1284         {"resolve-relative-url-test", resolve_relative_url_test, 0},
1285         {"init", module_init, SUPPORT_SUPER_PREFIX},
1286         {"remote-branch", resolve_remote_submodule_branch, 0},
1287         {"push-check", push_check, 0},
1288         {"absorb-git-dirs", absorb_git_dirs, SUPPORT_SUPER_PREFIX},
1289         {"is-active", is_active, 0},
1290         {"check-name", check_name, 0},
1291 };
1292
1293 int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
1294 {
1295         int i;
1296         if (argc < 2 || !strcmp(argv[1], "-h"))
1297                 usage("git submodule--helper <command>");
1298
1299         for (i = 0; i < ARRAY_SIZE(commands); i++) {
1300                 if (!strcmp(argv[1], commands[i].cmd)) {
1301                         if (get_super_prefix() &&
1302                             !(commands[i].option & SUPPORT_SUPER_PREFIX))
1303                                 die(_("%s doesn't support --super-prefix"),
1304                                     commands[i].cmd);
1305                         return commands[i].fn(argc - 1, argv + 1, prefix);
1306                 }
1307         }
1308
1309         die(_("'%s' is not a valid submodule--helper "
1310               "subcommand"), argv[1]);
1311 }