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