Andrew's git / gitweb.git / builtin/submodule--helper.c
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builtin / submodule--helper.con commit Merge branch 'jh/mingw-openssl-sha1' (033328a)
   1#include "builtin.h"
   2#include "cache.h"
   3#include "parse-options.h"
   4#include "quote.h"
   5#include "pathspec.h"
   6#include "dir.h"
   7#include "utf8.h"
   8#include "submodule.h"
   9#include "submodule-config.h"
  10#include "string-list.h"
  11#include "run-command.h"
  12#include "remote.h"
  13#include "refs.h"
  14#include "connect.h"
  15
  16static char *get_default_remote(void)
  17{
  18        char *dest = NULL, *ret;
  19        unsigned char sha1[20];
  20        struct strbuf sb = STRBUF_INIT;
  21        const char *refname = resolve_ref_unsafe("HEAD", 0, sha1, NULL);
  22
  23        if (!refname)
  24                die(_("No such ref: %s"), "HEAD");
  25
  26        /* detached HEAD */
  27        if (!strcmp(refname, "HEAD"))
  28                return xstrdup("origin");
  29
  30        if (!skip_prefix(refname, "refs/heads/", &refname))
  31                die(_("Expecting a full ref name, got %s"), refname);
  32
  33        strbuf_addf(&sb, "branch.%s.remote", refname);
  34        if (git_config_get_string(sb.buf, &dest))
  35                ret = xstrdup("origin");
  36        else
  37                ret = dest;
  38
  39        strbuf_release(&sb);
  40        return ret;
  41}
  42
  43static int starts_with_dot_slash(const char *str)
  44{
  45        return str[0] == '.' && is_dir_sep(str[1]);
  46}
  47
  48static int starts_with_dot_dot_slash(const char *str)
  49{
  50        return str[0] == '.' && str[1] == '.' && is_dir_sep(str[2]);
  51}
  52
  53/*
  54 * Returns 1 if it was the last chop before ':'.
  55 */
  56static int chop_last_dir(char **remoteurl, int is_relative)
  57{
  58        char *rfind = find_last_dir_sep(*remoteurl);
  59        if (rfind) {
  60                *rfind = '\0';
  61                return 0;
  62        }
  63
  64        rfind = strrchr(*remoteurl, ':');
  65        if (rfind) {
  66                *rfind = '\0';
  67                return 1;
  68        }
  69
  70        if (is_relative || !strcmp(".", *remoteurl))
  71                die(_("cannot strip one component off url '%s'"),
  72                        *remoteurl);
  73
  74        free(*remoteurl);
  75        *remoteurl = xstrdup(".");
  76        return 0;
  77}
  78
  79/*
  80 * The `url` argument is the URL that navigates to the submodule origin
  81 * repo. When relative, this URL is relative to the superproject origin
  82 * URL repo. The `up_path` argument, if specified, is the relative
  83 * path that navigates from the submodule working tree to the superproject
  84 * working tree. Returns the origin URL of the submodule.
  85 *
  86 * Return either an absolute URL or filesystem path (if the superproject
  87 * origin URL is an absolute URL or filesystem path, respectively) or a
  88 * relative file system path (if the superproject origin URL is a relative
  89 * file system path).
  90 *
  91 * When the output is a relative file system path, the path is either
  92 * relative to the submodule working tree, if up_path is specified, or to
  93 * the superproject working tree otherwise.
  94 *
  95 * NEEDSWORK: This works incorrectly on the domain and protocol part.
  96 * remote_url      url              outcome          expectation
  97 * http://a.com/b  ../c             http://a.com/c   as is
  98 * http://a.com/b/ ../c             http://a.com/c   same as previous line, but
  99 *                                                   ignore trailing slash in url
 100 * http://a.com/b  ../../c          http://c         error out
 101 * http://a.com/b  ../../../c       http:/c          error out
 102 * http://a.com/b  ../../../../c    http:c           error out
 103 * http://a.com/b  ../../../../../c    .:c           error out
 104 * NEEDSWORK: Given how chop_last_dir() works, this function is broken
 105 * when a local part has a colon in its path component, too.
 106 */
 107static char *relative_url(const char *remote_url,
 108                                const char *url,
 109                                const char *up_path)
 110{
 111        int is_relative = 0;
 112        int colonsep = 0;
 113        char *out;
 114        char *remoteurl = xstrdup(remote_url);
 115        struct strbuf sb = STRBUF_INIT;
 116        size_t len = strlen(remoteurl);
 117
 118        if (is_dir_sep(remoteurl[len-1]))
 119                remoteurl[len-1] = '\0';
 120
 121        if (!url_is_local_not_ssh(remoteurl) || is_absolute_path(remoteurl))
 122                is_relative = 0;
 123        else {
 124                is_relative = 1;
 125                /*
 126                 * Prepend a './' to ensure all relative
 127                 * remoteurls start with './' or '../'
 128                 */
 129                if (!starts_with_dot_slash(remoteurl) &&
 130                    !starts_with_dot_dot_slash(remoteurl)) {
 131                        strbuf_reset(&sb);
 132                        strbuf_addf(&sb, "./%s", remoteurl);
 133                        free(remoteurl);
 134                        remoteurl = strbuf_detach(&sb, NULL);
 135                }
 136        }
 137        /*
 138         * When the url starts with '../', remove that and the
 139         * last directory in remoteurl.
 140         */
 141        while (url) {
 142                if (starts_with_dot_dot_slash(url)) {
 143                        url += 3;
 144                        colonsep |= chop_last_dir(&remoteurl, is_relative);
 145                } else if (starts_with_dot_slash(url))
 146                        url += 2;
 147                else
 148                        break;
 149        }
 150        strbuf_reset(&sb);
 151        strbuf_addf(&sb, "%s%s%s", remoteurl, colonsep ? ":" : "/", url);
 152        if (ends_with(url, "/"))
 153                strbuf_setlen(&sb, sb.len - 1);
 154        free(remoteurl);
 155
 156        if (starts_with_dot_slash(sb.buf))
 157                out = xstrdup(sb.buf + 2);
 158        else
 159                out = xstrdup(sb.buf);
 160        strbuf_reset(&sb);
 161
 162        if (!up_path || !is_relative)
 163                return out;
 164
 165        strbuf_addf(&sb, "%s%s", up_path, out);
 166        free(out);
 167        return strbuf_detach(&sb, NULL);
 168}
 169
 170static int resolve_relative_url(int argc, const char **argv, const char *prefix)
 171{
 172        char *remoteurl = NULL;
 173        char *remote = get_default_remote();
 174        const char *up_path = NULL;
 175        char *res;
 176        const char *url;
 177        struct strbuf sb = STRBUF_INIT;
 178
 179        if (argc != 2 && argc != 3)
 180                die("resolve-relative-url only accepts one or two arguments");
 181
 182        url = argv[1];
 183        strbuf_addf(&sb, "remote.%s.url", remote);
 184        free(remote);
 185
 186        if (git_config_get_string(sb.buf, &remoteurl))
 187                /* the repository is its own authoritative upstream */
 188                remoteurl = xgetcwd();
 189
 190        if (argc == 3)
 191                up_path = argv[2];
 192
 193        res = relative_url(remoteurl, url, up_path);
 194        puts(res);
 195        free(res);
 196        free(remoteurl);
 197        return 0;
 198}
 199
 200static int resolve_relative_url_test(int argc, const char **argv, const char *prefix)
 201{
 202        char *remoteurl, *res;
 203        const char *up_path, *url;
 204
 205        if (argc != 4)
 206                die("resolve-relative-url-test only accepts three arguments: <up_path> <remoteurl> <url>");
 207
 208        up_path = argv[1];
 209        remoteurl = xstrdup(argv[2]);
 210        url = argv[3];
 211
 212        if (!strcmp(up_path, "(null)"))
 213                up_path = NULL;
 214
 215        res = relative_url(remoteurl, url, up_path);
 216        puts(res);
 217        free(res);
 218        free(remoteurl);
 219        return 0;
 220}
 221
 222struct module_list {
 223        const struct cache_entry **entries;
 224        int alloc, nr;
 225};
 226#define MODULE_LIST_INIT { NULL, 0, 0 }
 227
 228static int module_list_compute(int argc, const char **argv,
 229                               const char *prefix,
 230                               struct pathspec *pathspec,
 231                               struct module_list *list)
 232{
 233        int i, result = 0;
 234        char *ps_matched = NULL;
 235        parse_pathspec(pathspec, 0,
 236                       PATHSPEC_PREFER_FULL |
 237                       PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP,
 238                       prefix, argv);
 239
 240        if (pathspec->nr)
 241                ps_matched = xcalloc(pathspec->nr, 1);
 242
 243        if (read_cache() < 0)
 244                die(_("index file corrupt"));
 245
 246        for (i = 0; i < active_nr; i++) {
 247                const struct cache_entry *ce = active_cache[i];
 248
 249                if (!match_pathspec(pathspec, ce->name, ce_namelen(ce),
 250                                    0, ps_matched, 1) ||
 251                    !S_ISGITLINK(ce->ce_mode))
 252                        continue;
 253
 254                ALLOC_GROW(list->entries, list->nr + 1, list->alloc);
 255                list->entries[list->nr++] = ce;
 256                while (i + 1 < active_nr &&
 257                       !strcmp(ce->name, active_cache[i + 1]->name))
 258                        /*
 259                         * Skip entries with the same name in different stages
 260                         * to make sure an entry is returned only once.
 261                         */
 262                        i++;
 263        }
 264
 265        if (ps_matched && report_path_error(ps_matched, pathspec, prefix))
 266                result = -1;
 267
 268        free(ps_matched);
 269
 270        return result;
 271}
 272
 273static int module_list(int argc, const char **argv, const char *prefix)
 274{
 275        int i;
 276        struct pathspec pathspec;
 277        struct module_list list = MODULE_LIST_INIT;
 278
 279        struct option module_list_options[] = {
 280                OPT_STRING(0, "prefix", &prefix,
 281                           N_("path"),
 282                           N_("alternative anchor for relative paths")),
 283                OPT_END()
 284        };
 285
 286        const char *const git_submodule_helper_usage[] = {
 287                N_("git submodule--helper list [--prefix=<path>] [<path>...]"),
 288                NULL
 289        };
 290
 291        argc = parse_options(argc, argv, prefix, module_list_options,
 292                             git_submodule_helper_usage, 0);
 293
 294        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 295                return 1;
 296
 297        for (i = 0; i < list.nr; i++) {
 298                const struct cache_entry *ce = list.entries[i];
 299
 300                if (ce_stage(ce))
 301                        printf("%06o %s U\t", ce->ce_mode, sha1_to_hex(null_sha1));
 302                else
 303                        printf("%06o %s %d\t", ce->ce_mode,
 304                               oid_to_hex(&ce->oid), ce_stage(ce));
 305
 306                utf8_fprintf(stdout, "%s\n", ce->name);
 307        }
 308        return 0;
 309}
 310
 311static void init_submodule(const char *path, const char *prefix, int quiet)
 312{
 313        const struct submodule *sub;
 314        struct strbuf sb = STRBUF_INIT;
 315        char *upd = NULL, *url = NULL, *displaypath;
 316
 317        /* Only loads from .gitmodules, no overlay with .git/config */
 318        gitmodules_config();
 319
 320        if (prefix && get_super_prefix())
 321                die("BUG: cannot have prefix and superprefix");
 322        else if (prefix)
 323                displaypath = xstrdup(relative_path(path, prefix, &sb));
 324        else if (get_super_prefix()) {
 325                strbuf_addf(&sb, "%s%s", get_super_prefix(), path);
 326                displaypath = strbuf_detach(&sb, NULL);
 327        } else
 328                displaypath = xstrdup(path);
 329
 330        sub = submodule_from_path(null_sha1, path);
 331
 332        if (!sub)
 333                die(_("No url found for submodule path '%s' in .gitmodules"),
 334                        displaypath);
 335
 336        /*
 337         * Copy url setting when it is not set yet.
 338         * To look up the url in .git/config, we must not fall back to
 339         * .gitmodules, so look it up directly.
 340         */
 341        strbuf_reset(&sb);
 342        strbuf_addf(&sb, "submodule.%s.url", sub->name);
 343        if (git_config_get_string(sb.buf, &url)) {
 344                url = xstrdup(sub->url);
 345
 346                if (!url)
 347                        die(_("No url found for submodule path '%s' in .gitmodules"),
 348                                displaypath);
 349
 350                /* Possibly a url relative to parent */
 351                if (starts_with_dot_dot_slash(url) ||
 352                    starts_with_dot_slash(url)) {
 353                        char *remoteurl, *relurl;
 354                        char *remote = get_default_remote();
 355                        struct strbuf remotesb = STRBUF_INIT;
 356                        strbuf_addf(&remotesb, "remote.%s.url", remote);
 357                        free(remote);
 358
 359                        if (git_config_get_string(remotesb.buf, &remoteurl)) {
 360                                warning(_("could not lookup configuration '%s'. Assuming this repository is its own authoritative upstream."), remotesb.buf);
 361                                remoteurl = xgetcwd();
 362                        }
 363                        relurl = relative_url(remoteurl, url, NULL);
 364                        strbuf_release(&remotesb);
 365                        free(remoteurl);
 366                        free(url);
 367                        url = relurl;
 368                }
 369
 370                if (git_config_set_gently(sb.buf, url))
 371                        die(_("Failed to register url for submodule path '%s'"),
 372                            displaypath);
 373                if (!quiet)
 374                        fprintf(stderr,
 375                                _("Submodule '%s' (%s) registered for path '%s'\n"),
 376                                sub->name, url, displaypath);
 377        }
 378
 379        /* Copy "update" setting when it is not set yet */
 380        strbuf_reset(&sb);
 381        strbuf_addf(&sb, "submodule.%s.update", sub->name);
 382        if (git_config_get_string(sb.buf, &upd) &&
 383            sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
 384                if (sub->update_strategy.type == SM_UPDATE_COMMAND) {
 385                        fprintf(stderr, _("warning: command update mode suggested for submodule '%s'\n"),
 386                                sub->name);
 387                        upd = xstrdup("none");
 388                } else
 389                        upd = xstrdup(submodule_strategy_to_string(&sub->update_strategy));
 390
 391                if (git_config_set_gently(sb.buf, upd))
 392                        die(_("Failed to register update mode for submodule path '%s'"), displaypath);
 393        }
 394        strbuf_release(&sb);
 395        free(displaypath);
 396        free(url);
 397        free(upd);
 398}
 399
 400static int module_init(int argc, const char **argv, const char *prefix)
 401{
 402        struct pathspec pathspec;
 403        struct module_list list = MODULE_LIST_INIT;
 404        int quiet = 0;
 405        int i;
 406
 407        struct option module_init_options[] = {
 408                OPT__QUIET(&quiet, N_("Suppress output for initializing a submodule")),
 409                OPT_END()
 410        };
 411
 412        const char *const git_submodule_helper_usage[] = {
 413                N_("git submodule--helper init [<path>]"),
 414                NULL
 415        };
 416
 417        argc = parse_options(argc, argv, prefix, module_init_options,
 418                             git_submodule_helper_usage, 0);
 419
 420        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 421                return 1;
 422
 423        for (i = 0; i < list.nr; i++)
 424                init_submodule(list.entries[i]->name, prefix, quiet);
 425
 426        return 0;
 427}
 428
 429static int module_name(int argc, const char **argv, const char *prefix)
 430{
 431        const struct submodule *sub;
 432
 433        if (argc != 2)
 434                usage(_("git submodule--helper name <path>"));
 435
 436        gitmodules_config();
 437        sub = submodule_from_path(null_sha1, argv[1]);
 438
 439        if (!sub)
 440                die(_("no submodule mapping found in .gitmodules for path '%s'"),
 441                    argv[1]);
 442
 443        printf("%s\n", sub->name);
 444
 445        return 0;
 446}
 447
 448static int clone_submodule(const char *path, const char *gitdir, const char *url,
 449                           const char *depth, struct string_list *reference,
 450                           int quiet, int progress)
 451{
 452        struct child_process cp = CHILD_PROCESS_INIT;
 453
 454        argv_array_push(&cp.args, "clone");
 455        argv_array_push(&cp.args, "--no-checkout");
 456        if (quiet)
 457                argv_array_push(&cp.args, "--quiet");
 458        if (progress)
 459                argv_array_push(&cp.args, "--progress");
 460        if (depth && *depth)
 461                argv_array_pushl(&cp.args, "--depth", depth, NULL);
 462        if (reference->nr) {
 463                struct string_list_item *item;
 464                for_each_string_list_item(item, reference)
 465                        argv_array_pushl(&cp.args, "--reference",
 466                                         item->string, NULL);
 467        }
 468        if (gitdir && *gitdir)
 469                argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
 470
 471        argv_array_push(&cp.args, url);
 472        argv_array_push(&cp.args, path);
 473
 474        cp.git_cmd = 1;
 475        prepare_submodule_repo_env(&cp.env_array);
 476        cp.no_stdin = 1;
 477
 478        return run_command(&cp);
 479}
 480
 481struct submodule_alternate_setup {
 482        const char *submodule_name;
 483        enum SUBMODULE_ALTERNATE_ERROR_MODE {
 484                SUBMODULE_ALTERNATE_ERROR_DIE,
 485                SUBMODULE_ALTERNATE_ERROR_INFO,
 486                SUBMODULE_ALTERNATE_ERROR_IGNORE
 487        } error_mode;
 488        struct string_list *reference;
 489};
 490#define SUBMODULE_ALTERNATE_SETUP_INIT { NULL, \
 491        SUBMODULE_ALTERNATE_ERROR_IGNORE, NULL }
 492
 493static int add_possible_reference_from_superproject(
 494                struct alternate_object_database *alt, void *sas_cb)
 495{
 496        struct submodule_alternate_setup *sas = sas_cb;
 497
 498        /*
 499         * If the alternate object store is another repository, try the
 500         * standard layout with .git/(modules/<name>)+/objects
 501         */
 502        if (ends_with(alt->path, "/objects")) {
 503                char *sm_alternate;
 504                struct strbuf sb = STRBUF_INIT;
 505                struct strbuf err = STRBUF_INIT;
 506                strbuf_add(&sb, alt->path, strlen(alt->path) - strlen("objects"));
 507
 508                /*
 509                 * We need to end the new path with '/' to mark it as a dir,
 510                 * otherwise a submodule name containing '/' will be broken
 511                 * as the last part of a missing submodule reference would
 512                 * be taken as a file name.
 513                 */
 514                strbuf_addf(&sb, "modules/%s/", sas->submodule_name);
 515
 516                sm_alternate = compute_alternate_path(sb.buf, &err);
 517                if (sm_alternate) {
 518                        string_list_append(sas->reference, xstrdup(sb.buf));
 519                        free(sm_alternate);
 520                } else {
 521                        switch (sas->error_mode) {
 522                        case SUBMODULE_ALTERNATE_ERROR_DIE:
 523                                die(_("submodule '%s' cannot add alternate: %s"),
 524                                    sas->submodule_name, err.buf);
 525                        case SUBMODULE_ALTERNATE_ERROR_INFO:
 526                                fprintf(stderr, _("submodule '%s' cannot add alternate: %s"),
 527                                        sas->submodule_name, err.buf);
 528                        case SUBMODULE_ALTERNATE_ERROR_IGNORE:
 529                                ; /* nothing */
 530                        }
 531                }
 532                strbuf_release(&sb);
 533        }
 534
 535        return 0;
 536}
 537
 538static void prepare_possible_alternates(const char *sm_name,
 539                struct string_list *reference)
 540{
 541        char *sm_alternate = NULL, *error_strategy = NULL;
 542        struct submodule_alternate_setup sas = SUBMODULE_ALTERNATE_SETUP_INIT;
 543
 544        git_config_get_string("submodule.alternateLocation", &sm_alternate);
 545        if (!sm_alternate)
 546                return;
 547
 548        git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
 549
 550        if (!error_strategy)
 551                error_strategy = xstrdup("die");
 552
 553        sas.submodule_name = sm_name;
 554        sas.reference = reference;
 555        if (!strcmp(error_strategy, "die"))
 556                sas.error_mode = SUBMODULE_ALTERNATE_ERROR_DIE;
 557        else if (!strcmp(error_strategy, "info"))
 558                sas.error_mode = SUBMODULE_ALTERNATE_ERROR_INFO;
 559        else if (!strcmp(error_strategy, "ignore"))
 560                sas.error_mode = SUBMODULE_ALTERNATE_ERROR_IGNORE;
 561        else
 562                die(_("Value '%s' for submodule.alternateErrorStrategy is not recognized"), error_strategy);
 563
 564        if (!strcmp(sm_alternate, "superproject"))
 565                foreach_alt_odb(add_possible_reference_from_superproject, &sas);
 566        else if (!strcmp(sm_alternate, "no"))
 567                ; /* do nothing */
 568        else
 569                die(_("Value '%s' for submodule.alternateLocation is not recognized"), sm_alternate);
 570
 571        free(sm_alternate);
 572        free(error_strategy);
 573}
 574
 575static int module_clone(int argc, const char **argv, const char *prefix)
 576{
 577        const char *name = NULL, *url = NULL, *depth = NULL;
 578        int quiet = 0;
 579        int progress = 0;
 580        FILE *submodule_dot_git;
 581        char *p, *path = NULL, *sm_gitdir;
 582        struct strbuf rel_path = STRBUF_INIT;
 583        struct strbuf sb = STRBUF_INIT;
 584        struct string_list reference = STRING_LIST_INIT_NODUP;
 585        char *sm_alternate = NULL, *error_strategy = NULL;
 586
 587        struct option module_clone_options[] = {
 588                OPT_STRING(0, "prefix", &prefix,
 589                           N_("path"),
 590                           N_("alternative anchor for relative paths")),
 591                OPT_STRING(0, "path", &path,
 592                           N_("path"),
 593                           N_("where the new submodule will be cloned to")),
 594                OPT_STRING(0, "name", &name,
 595                           N_("string"),
 596                           N_("name of the new submodule")),
 597                OPT_STRING(0, "url", &url,
 598                           N_("string"),
 599                           N_("url where to clone the submodule from")),
 600                OPT_STRING_LIST(0, "reference", &reference,
 601                           N_("repo"),
 602                           N_("reference repository")),
 603                OPT_STRING(0, "depth", &depth,
 604                           N_("string"),
 605                           N_("depth for shallow clones")),
 606                OPT__QUIET(&quiet, "Suppress output for cloning a submodule"),
 607                OPT_BOOL(0, "progress", &progress,
 608                           N_("force cloning progress")),
 609                OPT_END()
 610        };
 611
 612        const char *const git_submodule_helper_usage[] = {
 613                N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
 614                   "[--reference <repository>] [--name <name>] [--depth <depth>] "
 615                   "--url <url> --path <path>"),
 616                NULL
 617        };
 618
 619        argc = parse_options(argc, argv, prefix, module_clone_options,
 620                             git_submodule_helper_usage, 0);
 621
 622        if (argc || !url || !path || !*path)
 623                usage_with_options(git_submodule_helper_usage,
 624                                   module_clone_options);
 625
 626        strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
 627        sm_gitdir = absolute_pathdup(sb.buf);
 628        strbuf_reset(&sb);
 629
 630        if (!is_absolute_path(path)) {
 631                strbuf_addf(&sb, "%s/%s", get_git_work_tree(), path);
 632                path = strbuf_detach(&sb, NULL);
 633        } else
 634                path = xstrdup(path);
 635
 636        if (!file_exists(sm_gitdir)) {
 637                if (safe_create_leading_directories_const(sm_gitdir) < 0)
 638                        die(_("could not create directory '%s'"), sm_gitdir);
 639
 640                prepare_possible_alternates(name, &reference);
 641
 642                if (clone_submodule(path, sm_gitdir, url, depth, &reference,
 643                                    quiet, progress))
 644                        die(_("clone of '%s' into submodule path '%s' failed"),
 645                            url, path);
 646        } else {
 647                if (safe_create_leading_directories_const(path) < 0)
 648                        die(_("could not create directory '%s'"), path);
 649                strbuf_addf(&sb, "%s/index", sm_gitdir);
 650                unlink_or_warn(sb.buf);
 651                strbuf_reset(&sb);
 652        }
 653
 654        /* Write a .git file in the submodule to redirect to the superproject. */
 655        strbuf_addf(&sb, "%s/.git", path);
 656        if (safe_create_leading_directories_const(sb.buf) < 0)
 657                die(_("could not create leading directories of '%s'"), sb.buf);
 658        submodule_dot_git = fopen(sb.buf, "w");
 659        if (!submodule_dot_git)
 660                die_errno(_("cannot open file '%s'"), sb.buf);
 661
 662        fprintf_or_die(submodule_dot_git, "gitdir: %s\n",
 663                       relative_path(sm_gitdir, path, &rel_path));
 664        if (fclose(submodule_dot_git))
 665                die(_("could not close file %s"), sb.buf);
 666        strbuf_reset(&sb);
 667        strbuf_reset(&rel_path);
 668
 669        /* Redirect the worktree of the submodule in the superproject's config */
 670        p = git_pathdup_submodule(path, "config");
 671        if (!p)
 672                die(_("could not get submodule directory for '%s'"), path);
 673        git_config_set_in_file(p, "core.worktree",
 674                               relative_path(path, sm_gitdir, &rel_path));
 675
 676        /* setup alternateLocation and alternateErrorStrategy in the cloned submodule if needed */
 677        git_config_get_string("submodule.alternateLocation", &sm_alternate);
 678        if (sm_alternate)
 679                git_config_set_in_file(p, "submodule.alternateLocation",
 680                                           sm_alternate);
 681        git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
 682        if (error_strategy)
 683                git_config_set_in_file(p, "submodule.alternateErrorStrategy",
 684                                           error_strategy);
 685
 686        free(sm_alternate);
 687        free(error_strategy);
 688
 689        strbuf_release(&sb);
 690        strbuf_release(&rel_path);
 691        free(sm_gitdir);
 692        free(path);
 693        free(p);
 694        return 0;
 695}
 696
 697struct submodule_update_clone {
 698        /* index into 'list', the list of submodules to look into for cloning */
 699        int current;
 700        struct module_list list;
 701        unsigned warn_if_uninitialized : 1;
 702
 703        /* update parameter passed via commandline */
 704        struct submodule_update_strategy update;
 705
 706        /* configuration parameters which are passed on to the children */
 707        int progress;
 708        int quiet;
 709        int recommend_shallow;
 710        struct string_list references;
 711        const char *depth;
 712        const char *recursive_prefix;
 713        const char *prefix;
 714
 715        /* Machine-readable status lines to be consumed by git-submodule.sh */
 716        struct string_list projectlines;
 717
 718        /* If we want to stop as fast as possible and return an error */
 719        unsigned quickstop : 1;
 720
 721        /* failed clones to be retried again */
 722        const struct cache_entry **failed_clones;
 723        int failed_clones_nr, failed_clones_alloc;
 724};
 725#define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
 726        SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, \
 727        NULL, NULL, NULL, \
 728        STRING_LIST_INIT_DUP, 0, NULL, 0, 0}
 729
 730
 731static void next_submodule_warn_missing(struct submodule_update_clone *suc,
 732                struct strbuf *out, const char *displaypath)
 733{
 734        /*
 735         * Only mention uninitialized submodules when their
 736         * paths have been specified.
 737         */
 738        if (suc->warn_if_uninitialized) {
 739                strbuf_addf(out,
 740                        _("Submodule path '%s' not initialized"),
 741                        displaypath);
 742                strbuf_addch(out, '\n');
 743                strbuf_addstr(out,
 744                        _("Maybe you want to use 'update --init'?"));
 745                strbuf_addch(out, '\n');
 746        }
 747}
 748
 749/**
 750 * Determine whether 'ce' needs to be cloned. If so, prepare the 'child' to
 751 * run the clone. Returns 1 if 'ce' needs to be cloned, 0 otherwise.
 752 */
 753static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
 754                                           struct child_process *child,
 755                                           struct submodule_update_clone *suc,
 756                                           struct strbuf *out)
 757{
 758        const struct submodule *sub = NULL;
 759        struct strbuf displaypath_sb = STRBUF_INIT;
 760        struct strbuf sb = STRBUF_INIT;
 761        const char *displaypath = NULL;
 762        char *url = NULL;
 763        int needs_cloning = 0;
 764
 765        if (ce_stage(ce)) {
 766                if (suc->recursive_prefix)
 767                        strbuf_addf(&sb, "%s/%s", suc->recursive_prefix, ce->name);
 768                else
 769                        strbuf_addstr(&sb, ce->name);
 770                strbuf_addf(out, _("Skipping unmerged submodule %s"), sb.buf);
 771                strbuf_addch(out, '\n');
 772                goto cleanup;
 773        }
 774
 775        sub = submodule_from_path(null_sha1, ce->name);
 776
 777        if (suc->recursive_prefix)
 778                displaypath = relative_path(suc->recursive_prefix,
 779                                            ce->name, &displaypath_sb);
 780        else
 781                displaypath = ce->name;
 782
 783        if (!sub) {
 784                next_submodule_warn_missing(suc, out, displaypath);
 785                goto cleanup;
 786        }
 787
 788        if (suc->update.type == SM_UPDATE_NONE
 789            || (suc->update.type == SM_UPDATE_UNSPECIFIED
 790                && sub->update_strategy.type == SM_UPDATE_NONE)) {
 791                strbuf_addf(out, _("Skipping submodule '%s'"), displaypath);
 792                strbuf_addch(out, '\n');
 793                goto cleanup;
 794        }
 795
 796        /*
 797         * Looking up the url in .git/config.
 798         * We must not fall back to .gitmodules as we only want
 799         * to process configured submodules.
 800         */
 801        strbuf_reset(&sb);
 802        strbuf_addf(&sb, "submodule.%s.url", sub->name);
 803        git_config_get_string(sb.buf, &url);
 804        if (!url) {
 805                next_submodule_warn_missing(suc, out, displaypath);
 806                goto cleanup;
 807        }
 808
 809        strbuf_reset(&sb);
 810        strbuf_addf(&sb, "%s/.git", ce->name);
 811        needs_cloning = !file_exists(sb.buf);
 812
 813        strbuf_reset(&sb);
 814        strbuf_addf(&sb, "%06o %s %d %d\t%s\n", ce->ce_mode,
 815                        oid_to_hex(&ce->oid), ce_stage(ce),
 816                        needs_cloning, ce->name);
 817        string_list_append(&suc->projectlines, sb.buf);
 818
 819        if (!needs_cloning)
 820                goto cleanup;
 821
 822        child->git_cmd = 1;
 823        child->no_stdin = 1;
 824        child->stdout_to_stderr = 1;
 825        child->err = -1;
 826        argv_array_push(&child->args, "submodule--helper");
 827        argv_array_push(&child->args, "clone");
 828        if (suc->progress)
 829                argv_array_push(&child->args, "--progress");
 830        if (suc->quiet)
 831                argv_array_push(&child->args, "--quiet");
 832        if (suc->prefix)
 833                argv_array_pushl(&child->args, "--prefix", suc->prefix, NULL);
 834        if (suc->recommend_shallow && sub->recommend_shallow == 1)
 835                argv_array_push(&child->args, "--depth=1");
 836        argv_array_pushl(&child->args, "--path", sub->path, NULL);
 837        argv_array_pushl(&child->args, "--name", sub->name, NULL);
 838        argv_array_pushl(&child->args, "--url", url, NULL);
 839        if (suc->references.nr) {
 840                struct string_list_item *item;
 841                for_each_string_list_item(item, &suc->references)
 842                        argv_array_pushl(&child->args, "--reference", item->string, NULL);
 843        }
 844        if (suc->depth)
 845                argv_array_push(&child->args, suc->depth);
 846
 847cleanup:
 848        free(url);
 849        strbuf_reset(&displaypath_sb);
 850        strbuf_reset(&sb);
 851
 852        return needs_cloning;
 853}
 854
 855static int update_clone_get_next_task(struct child_process *child,
 856                                      struct strbuf *err,
 857                                      void *suc_cb,
 858                                      void **idx_task_cb)
 859{
 860        struct submodule_update_clone *suc = suc_cb;
 861        const struct cache_entry *ce;
 862        int index;
 863
 864        for (; suc->current < suc->list.nr; suc->current++) {
 865                ce = suc->list.entries[suc->current];
 866                if (prepare_to_clone_next_submodule(ce, child, suc, err)) {
 867                        int *p = xmalloc(sizeof(*p));
 868                        *p = suc->current;
 869                        *idx_task_cb = p;
 870                        suc->current++;
 871                        return 1;
 872                }
 873        }
 874
 875        /*
 876         * The loop above tried cloning each submodule once, now try the
 877         * stragglers again, which we can imagine as an extension of the
 878         * entry list.
 879         */
 880        index = suc->current - suc->list.nr;
 881        if (index < suc->failed_clones_nr) {
 882                int *p;
 883                ce = suc->failed_clones[index];
 884                if (!prepare_to_clone_next_submodule(ce, child, suc, err)) {
 885                        suc->current ++;
 886                        strbuf_addstr(err, "BUG: submodule considered for "
 887                                           "cloning, doesn't need cloning "
 888                                           "any more?\n");
 889                        return 0;
 890                }
 891                p = xmalloc(sizeof(*p));
 892                *p = suc->current;
 893                *idx_task_cb = p;
 894                suc->current ++;
 895                return 1;
 896        }
 897
 898        return 0;
 899}
 900
 901static int update_clone_start_failure(struct strbuf *err,
 902                                      void *suc_cb,
 903                                      void *idx_task_cb)
 904{
 905        struct submodule_update_clone *suc = suc_cb;
 906        suc->quickstop = 1;
 907        return 1;
 908}
 909
 910static int update_clone_task_finished(int result,
 911                                      struct strbuf *err,
 912                                      void *suc_cb,
 913                                      void *idx_task_cb)
 914{
 915        const struct cache_entry *ce;
 916        struct submodule_update_clone *suc = suc_cb;
 917
 918        int *idxP = *(int**)idx_task_cb;
 919        int idx = *idxP;
 920        free(idxP);
 921
 922        if (!result)
 923                return 0;
 924
 925        if (idx < suc->list.nr) {
 926                ce  = suc->list.entries[idx];
 927                strbuf_addf(err, _("Failed to clone '%s'. Retry scheduled"),
 928                            ce->name);
 929                strbuf_addch(err, '\n');
 930                ALLOC_GROW(suc->failed_clones,
 931                           suc->failed_clones_nr + 1,
 932                           suc->failed_clones_alloc);
 933                suc->failed_clones[suc->failed_clones_nr++] = ce;
 934                return 0;
 935        } else {
 936                idx -= suc->list.nr;
 937                ce  = suc->failed_clones[idx];
 938                strbuf_addf(err, _("Failed to clone '%s' a second time, aborting"),
 939                            ce->name);
 940                strbuf_addch(err, '\n');
 941                suc->quickstop = 1;
 942                return 1;
 943        }
 944
 945        return 0;
 946}
 947
 948static int update_clone(int argc, const char **argv, const char *prefix)
 949{
 950        const char *update = NULL;
 951        int max_jobs = -1;
 952        struct string_list_item *item;
 953        struct pathspec pathspec;
 954        struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
 955
 956        struct option module_update_clone_options[] = {
 957                OPT_STRING(0, "prefix", &prefix,
 958                           N_("path"),
 959                           N_("path into the working tree")),
 960                OPT_STRING(0, "recursive-prefix", &suc.recursive_prefix,
 961                           N_("path"),
 962                           N_("path into the working tree, across nested "
 963                              "submodule boundaries")),
 964                OPT_STRING(0, "update", &update,
 965                           N_("string"),
 966                           N_("rebase, merge, checkout or none")),
 967                OPT_STRING_LIST(0, "reference", &suc.references, N_("repo"),
 968                           N_("reference repository")),
 969                OPT_STRING(0, "depth", &suc.depth, "<depth>",
 970                           N_("Create a shallow clone truncated to the "
 971                              "specified number of revisions")),
 972                OPT_INTEGER('j', "jobs", &max_jobs,
 973                            N_("parallel jobs")),
 974                OPT_BOOL(0, "recommend-shallow", &suc.recommend_shallow,
 975                            N_("whether the initial clone should follow the shallow recommendation")),
 976                OPT__QUIET(&suc.quiet, N_("don't print cloning progress")),
 977                OPT_BOOL(0, "progress", &suc.progress,
 978                            N_("force cloning progress")),
 979                OPT_END()
 980        };
 981
 982        const char *const git_submodule_helper_usage[] = {
 983                N_("git submodule--helper update_clone [--prefix=<path>] [<path>...]"),
 984                NULL
 985        };
 986        suc.prefix = prefix;
 987
 988        argc = parse_options(argc, argv, prefix, module_update_clone_options,
 989                             git_submodule_helper_usage, 0);
 990
 991        if (update)
 992                if (parse_submodule_update_strategy(update, &suc.update) < 0)
 993                        die(_("bad value for update parameter"));
 994
 995        if (module_list_compute(argc, argv, prefix, &pathspec, &suc.list) < 0)
 996                return 1;
 997
 998        if (pathspec.nr)
 999                suc.warn_if_uninitialized = 1;
1000
1001        /* Overlay the parsed .gitmodules file with .git/config */
1002        gitmodules_config();
1003        git_config(submodule_config, NULL);
1004
1005        if (max_jobs < 0)
1006                max_jobs = parallel_submodules();
1007
1008        run_processes_parallel(max_jobs,
1009                               update_clone_get_next_task,
1010                               update_clone_start_failure,
1011                               update_clone_task_finished,
1012                               &suc);
1013
1014        /*
1015         * We saved the output and put it out all at once now.
1016         * That means:
1017         * - the listener does not have to interleave their (checkout)
1018         *   work with our fetching.  The writes involved in a
1019         *   checkout involve more straightforward sequential I/O.
1020         * - the listener can avoid doing any work if fetching failed.
1021         */
1022        if (suc.quickstop)
1023                return 1;
1024
1025        for_each_string_list_item(item, &suc.projectlines)
1026                utf8_fprintf(stdout, "%s", item->string);
1027
1028        return 0;
1029}
1030
1031static int resolve_relative_path(int argc, const char **argv, const char *prefix)
1032{
1033        struct strbuf sb = STRBUF_INIT;
1034        if (argc != 3)
1035                die("submodule--helper relative-path takes exactly 2 arguments, got %d", argc);
1036
1037        printf("%s", relative_path(argv[1], argv[2], &sb));
1038        strbuf_release(&sb);
1039        return 0;
1040}
1041
1042static const char *remote_submodule_branch(const char *path)
1043{
1044        const struct submodule *sub;
1045        gitmodules_config();
1046        git_config(submodule_config, NULL);
1047
1048        sub = submodule_from_path(null_sha1, path);
1049        if (!sub)
1050                return NULL;
1051
1052        if (!sub->branch)
1053                return "master";
1054
1055        if (!strcmp(sub->branch, ".")) {
1056                unsigned char sha1[20];
1057                const char *refname = resolve_ref_unsafe("HEAD", 0, sha1, NULL);
1058
1059                if (!refname)
1060                        die(_("No such ref: %s"), "HEAD");
1061
1062                /* detached HEAD */
1063                if (!strcmp(refname, "HEAD"))
1064                        die(_("Submodule (%s) branch configured to inherit "
1065                              "branch from superproject, but the superproject "
1066                              "is not on any branch"), sub->name);
1067
1068                if (!skip_prefix(refname, "refs/heads/", &refname))
1069                        die(_("Expecting a full ref name, got %s"), refname);
1070                return refname;
1071        }
1072
1073        return sub->branch;
1074}
1075
1076static int resolve_remote_submodule_branch(int argc, const char **argv,
1077                const char *prefix)
1078{
1079        const char *ret;
1080        struct strbuf sb = STRBUF_INIT;
1081        if (argc != 2)
1082                die("submodule--helper remote-branch takes exactly one arguments, got %d", argc);
1083
1084        ret = remote_submodule_branch(argv[1]);
1085        if (!ret)
1086                die("submodule %s doesn't exist", argv[1]);
1087
1088        printf("%s", ret);
1089        strbuf_release(&sb);
1090        return 0;
1091}
1092
1093static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
1094{
1095        int i;
1096        struct pathspec pathspec;
1097        struct module_list list = MODULE_LIST_INIT;
1098        unsigned flags = ABSORB_GITDIR_RECURSE_SUBMODULES;
1099
1100        struct option embed_gitdir_options[] = {
1101                OPT_STRING(0, "prefix", &prefix,
1102                           N_("path"),
1103                           N_("path into the working tree")),
1104                OPT_BIT(0, "--recursive", &flags, N_("recurse into submodules"),
1105                        ABSORB_GITDIR_RECURSE_SUBMODULES),
1106                OPT_END()
1107        };
1108
1109        const char *const git_submodule_helper_usage[] = {
1110                N_("git submodule--helper embed-git-dir [<path>...]"),
1111                NULL
1112        };
1113
1114        argc = parse_options(argc, argv, prefix, embed_gitdir_options,
1115                             git_submodule_helper_usage, 0);
1116
1117        gitmodules_config();
1118        git_config(submodule_config, NULL);
1119
1120        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1121                return 1;
1122
1123        for (i = 0; i < list.nr; i++)
1124                absorb_git_dir_into_superproject(prefix,
1125                                list.entries[i]->name, flags);
1126
1127        return 0;
1128}
1129
1130#define SUPPORT_SUPER_PREFIX (1<<0)
1131
1132struct cmd_struct {
1133        const char *cmd;
1134        int (*fn)(int, const char **, const char *);
1135        unsigned option;
1136};
1137
1138static struct cmd_struct commands[] = {
1139        {"list", module_list, 0},
1140        {"name", module_name, 0},
1141        {"clone", module_clone, 0},
1142        {"update-clone", update_clone, 0},
1143        {"relative-path", resolve_relative_path, 0},
1144        {"resolve-relative-url", resolve_relative_url, 0},
1145        {"resolve-relative-url-test", resolve_relative_url_test, 0},
1146        {"init", module_init, SUPPORT_SUPER_PREFIX},
1147        {"remote-branch", resolve_remote_submodule_branch, 0},
1148        {"absorb-git-dirs", absorb_git_dirs, SUPPORT_SUPER_PREFIX},
1149};
1150
1151int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
1152{
1153        int i;
1154        if (argc < 2)
1155                die(_("submodule--helper subcommand must be "
1156                      "called with a subcommand"));
1157
1158        for (i = 0; i < ARRAY_SIZE(commands); i++) {
1159                if (!strcmp(argv[1], commands[i].cmd)) {
1160                        if (get_super_prefix() &&
1161                            !(commands[i].option & SUPPORT_SUPER_PREFIX))
1162                                die(_("%s doesn't support --super-prefix"),
1163                                    commands[i].cmd);
1164                        return commands[i].fn(argc - 1, argv + 1, prefix);
1165                }
1166        }
1167
1168        die(_("'%s' is not a valid submodule--helper "
1169              "subcommand"), argv[1]);
1170}