Andrew's git / gitweb.git / builtin/submodule--helper.c
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builtin / submodule--helper.con commit Merge branch 'mm/fetch-show-error-message-on-unadvertised-object' into maint (2b69d31)
   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                                /*
 361                                 * The repository is its own
 362                                 * authoritative upstream
 363                                 */
 364                                remoteurl = xgetcwd();
 365                        relurl = relative_url(remoteurl, url, NULL);
 366                        strbuf_release(&remotesb);
 367                        free(remoteurl);
 368                        free(url);
 369                        url = relurl;
 370                }
 371
 372                if (git_config_set_gently(sb.buf, url))
 373                        die(_("Failed to register url for submodule path '%s'"),
 374                            displaypath);
 375                if (!quiet)
 376                        fprintf(stderr,
 377                                _("Submodule '%s' (%s) registered for path '%s'\n"),
 378                                sub->name, url, displaypath);
 379        }
 380
 381        /* Copy "update" setting when it is not set yet */
 382        strbuf_reset(&sb);
 383        strbuf_addf(&sb, "submodule.%s.update", sub->name);
 384        if (git_config_get_string(sb.buf, &upd) &&
 385            sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
 386                if (sub->update_strategy.type == SM_UPDATE_COMMAND) {
 387                        fprintf(stderr, _("warning: command update mode suggested for submodule '%s'\n"),
 388                                sub->name);
 389                        upd = xstrdup("none");
 390                } else
 391                        upd = xstrdup(submodule_strategy_to_string(&sub->update_strategy));
 392
 393                if (git_config_set_gently(sb.buf, upd))
 394                        die(_("Failed to register update mode for submodule path '%s'"), displaypath);
 395        }
 396        strbuf_release(&sb);
 397        free(displaypath);
 398        free(url);
 399        free(upd);
 400}
 401
 402static int module_init(int argc, const char **argv, const char *prefix)
 403{
 404        struct pathspec pathspec;
 405        struct module_list list = MODULE_LIST_INIT;
 406        int quiet = 0;
 407        int i;
 408
 409        struct option module_init_options[] = {
 410                OPT__QUIET(&quiet, N_("Suppress output for initializing a submodule")),
 411                OPT_END()
 412        };
 413
 414        const char *const git_submodule_helper_usage[] = {
 415                N_("git submodule--helper init [<path>]"),
 416                NULL
 417        };
 418
 419        argc = parse_options(argc, argv, prefix, module_init_options,
 420                             git_submodule_helper_usage, 0);
 421
 422        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 423                return 1;
 424
 425        for (i = 0; i < list.nr; i++)
 426                init_submodule(list.entries[i]->name, prefix, quiet);
 427
 428        return 0;
 429}
 430
 431static int module_name(int argc, const char **argv, const char *prefix)
 432{
 433        const struct submodule *sub;
 434
 435        if (argc != 2)
 436                usage(_("git submodule--helper name <path>"));
 437
 438        gitmodules_config();
 439        sub = submodule_from_path(null_sha1, argv[1]);
 440
 441        if (!sub)
 442                die(_("no submodule mapping found in .gitmodules for path '%s'"),
 443                    argv[1]);
 444
 445        printf("%s\n", sub->name);
 446
 447        return 0;
 448}
 449
 450static int clone_submodule(const char *path, const char *gitdir, const char *url,
 451                           const char *depth, struct string_list *reference,
 452                           int quiet, int progress)
 453{
 454        struct child_process cp = CHILD_PROCESS_INIT;
 455
 456        argv_array_push(&cp.args, "clone");
 457        argv_array_push(&cp.args, "--no-checkout");
 458        if (quiet)
 459                argv_array_push(&cp.args, "--quiet");
 460        if (progress)
 461                argv_array_push(&cp.args, "--progress");
 462        if (depth && *depth)
 463                argv_array_pushl(&cp.args, "--depth", depth, NULL);
 464        if (reference->nr) {
 465                struct string_list_item *item;
 466                for_each_string_list_item(item, reference)
 467                        argv_array_pushl(&cp.args, "--reference",
 468                                         item->string, NULL);
 469        }
 470        if (gitdir && *gitdir)
 471                argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
 472
 473        argv_array_push(&cp.args, url);
 474        argv_array_push(&cp.args, path);
 475
 476        cp.git_cmd = 1;
 477        prepare_submodule_repo_env(&cp.env_array);
 478        cp.no_stdin = 1;
 479
 480        return run_command(&cp);
 481}
 482
 483struct submodule_alternate_setup {
 484        const char *submodule_name;
 485        enum SUBMODULE_ALTERNATE_ERROR_MODE {
 486                SUBMODULE_ALTERNATE_ERROR_DIE,
 487                SUBMODULE_ALTERNATE_ERROR_INFO,
 488                SUBMODULE_ALTERNATE_ERROR_IGNORE
 489        } error_mode;
 490        struct string_list *reference;
 491};
 492#define SUBMODULE_ALTERNATE_SETUP_INIT { NULL, \
 493        SUBMODULE_ALTERNATE_ERROR_IGNORE, NULL }
 494
 495static int add_possible_reference_from_superproject(
 496                struct alternate_object_database *alt, void *sas_cb)
 497{
 498        struct submodule_alternate_setup *sas = sas_cb;
 499
 500        /*
 501         * If the alternate object store is another repository, try the
 502         * standard layout with .git/(modules/<name>)+/objects
 503         */
 504        if (ends_with(alt->path, "/objects")) {
 505                char *sm_alternate;
 506                struct strbuf sb = STRBUF_INIT;
 507                struct strbuf err = STRBUF_INIT;
 508                strbuf_add(&sb, alt->path, strlen(alt->path) - strlen("objects"));
 509
 510                /*
 511                 * We need to end the new path with '/' to mark it as a dir,
 512                 * otherwise a submodule name containing '/' will be broken
 513                 * as the last part of a missing submodule reference would
 514                 * be taken as a file name.
 515                 */
 516                strbuf_addf(&sb, "modules/%s/", sas->submodule_name);
 517
 518                sm_alternate = compute_alternate_path(sb.buf, &err);
 519                if (sm_alternate) {
 520                        string_list_append(sas->reference, xstrdup(sb.buf));
 521                        free(sm_alternate);
 522                } else {
 523                        switch (sas->error_mode) {
 524                        case SUBMODULE_ALTERNATE_ERROR_DIE:
 525                                die(_("submodule '%s' cannot add alternate: %s"),
 526                                    sas->submodule_name, err.buf);
 527                        case SUBMODULE_ALTERNATE_ERROR_INFO:
 528                                fprintf(stderr, _("submodule '%s' cannot add alternate: %s"),
 529                                        sas->submodule_name, err.buf);
 530                        case SUBMODULE_ALTERNATE_ERROR_IGNORE:
 531                                ; /* nothing */
 532                        }
 533                }
 534                strbuf_release(&sb);
 535        }
 536
 537        return 0;
 538}
 539
 540static void prepare_possible_alternates(const char *sm_name,
 541                struct string_list *reference)
 542{
 543        char *sm_alternate = NULL, *error_strategy = NULL;
 544        struct submodule_alternate_setup sas = SUBMODULE_ALTERNATE_SETUP_INIT;
 545
 546        git_config_get_string("submodule.alternateLocation", &sm_alternate);
 547        if (!sm_alternate)
 548                return;
 549
 550        git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
 551
 552        if (!error_strategy)
 553                error_strategy = xstrdup("die");
 554
 555        sas.submodule_name = sm_name;
 556        sas.reference = reference;
 557        if (!strcmp(error_strategy, "die"))
 558                sas.error_mode = SUBMODULE_ALTERNATE_ERROR_DIE;
 559        else if (!strcmp(error_strategy, "info"))
 560                sas.error_mode = SUBMODULE_ALTERNATE_ERROR_INFO;
 561        else if (!strcmp(error_strategy, "ignore"))
 562                sas.error_mode = SUBMODULE_ALTERNATE_ERROR_IGNORE;
 563        else
 564                die(_("Value '%s' for submodule.alternateErrorStrategy is not recognized"), error_strategy);
 565
 566        if (!strcmp(sm_alternate, "superproject"))
 567                foreach_alt_odb(add_possible_reference_from_superproject, &sas);
 568        else if (!strcmp(sm_alternate, "no"))
 569                ; /* do nothing */
 570        else
 571                die(_("Value '%s' for submodule.alternateLocation is not recognized"), sm_alternate);
 572
 573        free(sm_alternate);
 574        free(error_strategy);
 575}
 576
 577static int module_clone(int argc, const char **argv, const char *prefix)
 578{
 579        const char *name = NULL, *url = NULL, *depth = NULL;
 580        int quiet = 0;
 581        int progress = 0;
 582        FILE *submodule_dot_git;
 583        char *p, *path = NULL, *sm_gitdir;
 584        struct strbuf rel_path = STRBUF_INIT;
 585        struct strbuf sb = STRBUF_INIT;
 586        struct string_list reference = STRING_LIST_INIT_NODUP;
 587        char *sm_alternate = NULL, *error_strategy = NULL;
 588
 589        struct option module_clone_options[] = {
 590                OPT_STRING(0, "prefix", &prefix,
 591                           N_("path"),
 592                           N_("alternative anchor for relative paths")),
 593                OPT_STRING(0, "path", &path,
 594                           N_("path"),
 595                           N_("where the new submodule will be cloned to")),
 596                OPT_STRING(0, "name", &name,
 597                           N_("string"),
 598                           N_("name of the new submodule")),
 599                OPT_STRING(0, "url", &url,
 600                           N_("string"),
 601                           N_("url where to clone the submodule from")),
 602                OPT_STRING_LIST(0, "reference", &reference,
 603                           N_("repo"),
 604                           N_("reference repository")),
 605                OPT_STRING(0, "depth", &depth,
 606                           N_("string"),
 607                           N_("depth for shallow clones")),
 608                OPT__QUIET(&quiet, "Suppress output for cloning a submodule"),
 609                OPT_BOOL(0, "progress", &progress,
 610                           N_("force cloning progress")),
 611                OPT_END()
 612        };
 613
 614        const char *const git_submodule_helper_usage[] = {
 615                N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
 616                   "[--reference <repository>] [--name <name>] [--depth <depth>] "
 617                   "--url <url> --path <path>"),
 618                NULL
 619        };
 620
 621        argc = parse_options(argc, argv, prefix, module_clone_options,
 622                             git_submodule_helper_usage, 0);
 623
 624        if (argc || !url || !path || !*path)
 625                usage_with_options(git_submodule_helper_usage,
 626                                   module_clone_options);
 627
 628        strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
 629        sm_gitdir = absolute_pathdup(sb.buf);
 630        strbuf_reset(&sb);
 631
 632        if (!is_absolute_path(path)) {
 633                strbuf_addf(&sb, "%s/%s", get_git_work_tree(), path);
 634                path = strbuf_detach(&sb, NULL);
 635        } else
 636                path = xstrdup(path);
 637
 638        if (!file_exists(sm_gitdir)) {
 639                if (safe_create_leading_directories_const(sm_gitdir) < 0)
 640                        die(_("could not create directory '%s'"), sm_gitdir);
 641
 642                prepare_possible_alternates(name, &reference);
 643
 644                if (clone_submodule(path, sm_gitdir, url, depth, &reference,
 645                                    quiet, progress))
 646                        die(_("clone of '%s' into submodule path '%s' failed"),
 647                            url, path);
 648        } else {
 649                if (safe_create_leading_directories_const(path) < 0)
 650                        die(_("could not create directory '%s'"), path);
 651                strbuf_addf(&sb, "%s/index", sm_gitdir);
 652                unlink_or_warn(sb.buf);
 653                strbuf_reset(&sb);
 654        }
 655
 656        /* Write a .git file in the submodule to redirect to the superproject. */
 657        strbuf_addf(&sb, "%s/.git", path);
 658        if (safe_create_leading_directories_const(sb.buf) < 0)
 659                die(_("could not create leading directories of '%s'"), sb.buf);
 660        submodule_dot_git = fopen(sb.buf, "w");
 661        if (!submodule_dot_git)
 662                die_errno(_("cannot open file '%s'"), sb.buf);
 663
 664        fprintf_or_die(submodule_dot_git, "gitdir: %s\n",
 665                       relative_path(sm_gitdir, path, &rel_path));
 666        if (fclose(submodule_dot_git))
 667                die(_("could not close file %s"), sb.buf);
 668        strbuf_reset(&sb);
 669        strbuf_reset(&rel_path);
 670
 671        /* Redirect the worktree of the submodule in the superproject's config */
 672        p = git_pathdup_submodule(path, "config");
 673        if (!p)
 674                die(_("could not get submodule directory for '%s'"), path);
 675        git_config_set_in_file(p, "core.worktree",
 676                               relative_path(path, sm_gitdir, &rel_path));
 677
 678        /* setup alternateLocation and alternateErrorStrategy in the cloned submodule if needed */
 679        git_config_get_string("submodule.alternateLocation", &sm_alternate);
 680        if (sm_alternate)
 681                git_config_set_in_file(p, "submodule.alternateLocation",
 682                                           sm_alternate);
 683        git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
 684        if (error_strategy)
 685                git_config_set_in_file(p, "submodule.alternateErrorStrategy",
 686                                           error_strategy);
 687
 688        free(sm_alternate);
 689        free(error_strategy);
 690
 691        strbuf_release(&sb);
 692        strbuf_release(&rel_path);
 693        free(sm_gitdir);
 694        free(path);
 695        free(p);
 696        return 0;
 697}
 698
 699struct submodule_update_clone {
 700        /* index into 'list', the list of submodules to look into for cloning */
 701        int current;
 702        struct module_list list;
 703        unsigned warn_if_uninitialized : 1;
 704
 705        /* update parameter passed via commandline */
 706        struct submodule_update_strategy update;
 707
 708        /* configuration parameters which are passed on to the children */
 709        int progress;
 710        int quiet;
 711        int recommend_shallow;
 712        struct string_list references;
 713        const char *depth;
 714        const char *recursive_prefix;
 715        const char *prefix;
 716
 717        /* Machine-readable status lines to be consumed by git-submodule.sh */
 718        struct string_list projectlines;
 719
 720        /* If we want to stop as fast as possible and return an error */
 721        unsigned quickstop : 1;
 722
 723        /* failed clones to be retried again */
 724        const struct cache_entry **failed_clones;
 725        int failed_clones_nr, failed_clones_alloc;
 726};
 727#define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
 728        SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, \
 729        NULL, NULL, NULL, \
 730        STRING_LIST_INIT_DUP, 0, NULL, 0, 0}
 731
 732
 733static void next_submodule_warn_missing(struct submodule_update_clone *suc,
 734                struct strbuf *out, const char *displaypath)
 735{
 736        /*
 737         * Only mention uninitialized submodules when their
 738         * paths have been specified.
 739         */
 740        if (suc->warn_if_uninitialized) {
 741                strbuf_addf(out,
 742                        _("Submodule path '%s' not initialized"),
 743                        displaypath);
 744                strbuf_addch(out, '\n');
 745                strbuf_addstr(out,
 746                        _("Maybe you want to use 'update --init'?"));
 747                strbuf_addch(out, '\n');
 748        }
 749}
 750
 751/**
 752 * Determine whether 'ce' needs to be cloned. If so, prepare the 'child' to
 753 * run the clone. Returns 1 if 'ce' needs to be cloned, 0 otherwise.
 754 */
 755static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
 756                                           struct child_process *child,
 757                                           struct submodule_update_clone *suc,
 758                                           struct strbuf *out)
 759{
 760        const struct submodule *sub = NULL;
 761        struct strbuf displaypath_sb = STRBUF_INIT;
 762        struct strbuf sb = STRBUF_INIT;
 763        const char *displaypath = NULL;
 764        char *url = NULL;
 765        int needs_cloning = 0;
 766
 767        if (ce_stage(ce)) {
 768                if (suc->recursive_prefix)
 769                        strbuf_addf(&sb, "%s/%s", suc->recursive_prefix, ce->name);
 770                else
 771                        strbuf_addstr(&sb, ce->name);
 772                strbuf_addf(out, _("Skipping unmerged submodule %s"), sb.buf);
 773                strbuf_addch(out, '\n');
 774                goto cleanup;
 775        }
 776
 777        sub = submodule_from_path(null_sha1, ce->name);
 778
 779        if (suc->recursive_prefix)
 780                displaypath = relative_path(suc->recursive_prefix,
 781                                            ce->name, &displaypath_sb);
 782        else
 783                displaypath = ce->name;
 784
 785        if (!sub) {
 786                next_submodule_warn_missing(suc, out, displaypath);
 787                goto cleanup;
 788        }
 789
 790        if (suc->update.type == SM_UPDATE_NONE
 791            || (suc->update.type == SM_UPDATE_UNSPECIFIED
 792                && sub->update_strategy.type == SM_UPDATE_NONE)) {
 793                strbuf_addf(out, _("Skipping submodule '%s'"), displaypath);
 794                strbuf_addch(out, '\n');
 795                goto cleanup;
 796        }
 797
 798        /*
 799         * Looking up the url in .git/config.
 800         * We must not fall back to .gitmodules as we only want
 801         * to process configured submodules.
 802         */
 803        strbuf_reset(&sb);
 804        strbuf_addf(&sb, "submodule.%s.url", sub->name);
 805        git_config_get_string(sb.buf, &url);
 806        if (!url) {
 807                next_submodule_warn_missing(suc, out, displaypath);
 808                goto cleanup;
 809        }
 810
 811        strbuf_reset(&sb);
 812        strbuf_addf(&sb, "%s/.git", ce->name);
 813        needs_cloning = !file_exists(sb.buf);
 814
 815        strbuf_reset(&sb);
 816        strbuf_addf(&sb, "%06o %s %d %d\t%s\n", ce->ce_mode,
 817                        oid_to_hex(&ce->oid), ce_stage(ce),
 818                        needs_cloning, ce->name);
 819        string_list_append(&suc->projectlines, sb.buf);
 820
 821        if (!needs_cloning)
 822                goto cleanup;
 823
 824        child->git_cmd = 1;
 825        child->no_stdin = 1;
 826        child->stdout_to_stderr = 1;
 827        child->err = -1;
 828        argv_array_push(&child->args, "submodule--helper");
 829        argv_array_push(&child->args, "clone");
 830        if (suc->progress)
 831                argv_array_push(&child->args, "--progress");
 832        if (suc->quiet)
 833                argv_array_push(&child->args, "--quiet");
 834        if (suc->prefix)
 835                argv_array_pushl(&child->args, "--prefix", suc->prefix, NULL);
 836        if (suc->recommend_shallow && sub->recommend_shallow == 1)
 837                argv_array_push(&child->args, "--depth=1");
 838        argv_array_pushl(&child->args, "--path", sub->path, NULL);
 839        argv_array_pushl(&child->args, "--name", sub->name, NULL);
 840        argv_array_pushl(&child->args, "--url", url, NULL);
 841        if (suc->references.nr) {
 842                struct string_list_item *item;
 843                for_each_string_list_item(item, &suc->references)
 844                        argv_array_pushl(&child->args, "--reference", item->string, NULL);
 845        }
 846        if (suc->depth)
 847                argv_array_push(&child->args, suc->depth);
 848
 849cleanup:
 850        free(url);
 851        strbuf_reset(&displaypath_sb);
 852        strbuf_reset(&sb);
 853
 854        return needs_cloning;
 855}
 856
 857static int update_clone_get_next_task(struct child_process *child,
 858                                      struct strbuf *err,
 859                                      void *suc_cb,
 860                                      void **idx_task_cb)
 861{
 862        struct submodule_update_clone *suc = suc_cb;
 863        const struct cache_entry *ce;
 864        int index;
 865
 866        for (; suc->current < suc->list.nr; suc->current++) {
 867                ce = suc->list.entries[suc->current];
 868                if (prepare_to_clone_next_submodule(ce, child, suc, err)) {
 869                        int *p = xmalloc(sizeof(*p));
 870                        *p = suc->current;
 871                        *idx_task_cb = p;
 872                        suc->current++;
 873                        return 1;
 874                }
 875        }
 876
 877        /*
 878         * The loop above tried cloning each submodule once, now try the
 879         * stragglers again, which we can imagine as an extension of the
 880         * entry list.
 881         */
 882        index = suc->current - suc->list.nr;
 883        if (index < suc->failed_clones_nr) {
 884                int *p;
 885                ce = suc->failed_clones[index];
 886                if (!prepare_to_clone_next_submodule(ce, child, suc, err)) {
 887                        suc->current ++;
 888                        strbuf_addstr(err, "BUG: submodule considered for "
 889                                           "cloning, doesn't need cloning "
 890                                           "any more?\n");
 891                        return 0;
 892                }
 893                p = xmalloc(sizeof(*p));
 894                *p = suc->current;
 895                *idx_task_cb = p;
 896                suc->current ++;
 897                return 1;
 898        }
 899
 900        return 0;
 901}
 902
 903static int update_clone_start_failure(struct strbuf *err,
 904                                      void *suc_cb,
 905                                      void *idx_task_cb)
 906{
 907        struct submodule_update_clone *suc = suc_cb;
 908        suc->quickstop = 1;
 909        return 1;
 910}
 911
 912static int update_clone_task_finished(int result,
 913                                      struct strbuf *err,
 914                                      void *suc_cb,
 915                                      void *idx_task_cb)
 916{
 917        const struct cache_entry *ce;
 918        struct submodule_update_clone *suc = suc_cb;
 919
 920        int *idxP = *(int**)idx_task_cb;
 921        int idx = *idxP;
 922        free(idxP);
 923
 924        if (!result)
 925                return 0;
 926
 927        if (idx < suc->list.nr) {
 928                ce  = suc->list.entries[idx];
 929                strbuf_addf(err, _("Failed to clone '%s'. Retry scheduled"),
 930                            ce->name);
 931                strbuf_addch(err, '\n');
 932                ALLOC_GROW(suc->failed_clones,
 933                           suc->failed_clones_nr + 1,
 934                           suc->failed_clones_alloc);
 935                suc->failed_clones[suc->failed_clones_nr++] = ce;
 936                return 0;
 937        } else {
 938                idx -= suc->list.nr;
 939                ce  = suc->failed_clones[idx];
 940                strbuf_addf(err, _("Failed to clone '%s' a second time, aborting"),
 941                            ce->name);
 942                strbuf_addch(err, '\n');
 943                suc->quickstop = 1;
 944                return 1;
 945        }
 946
 947        return 0;
 948}
 949
 950static int update_clone(int argc, const char **argv, const char *prefix)
 951{
 952        const char *update = NULL;
 953        int max_jobs = -1;
 954        struct string_list_item *item;
 955        struct pathspec pathspec;
 956        struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
 957
 958        struct option module_update_clone_options[] = {
 959                OPT_STRING(0, "prefix", &prefix,
 960                           N_("path"),
 961                           N_("path into the working tree")),
 962                OPT_STRING(0, "recursive-prefix", &suc.recursive_prefix,
 963                           N_("path"),
 964                           N_("path into the working tree, across nested "
 965                              "submodule boundaries")),
 966                OPT_STRING(0, "update", &update,
 967                           N_("string"),
 968                           N_("rebase, merge, checkout or none")),
 969                OPT_STRING_LIST(0, "reference", &suc.references, N_("repo"),
 970                           N_("reference repository")),
 971                OPT_STRING(0, "depth", &suc.depth, "<depth>",
 972                           N_("Create a shallow clone truncated to the "
 973                              "specified number of revisions")),
 974                OPT_INTEGER('j', "jobs", &max_jobs,
 975                            N_("parallel jobs")),
 976                OPT_BOOL(0, "recommend-shallow", &suc.recommend_shallow,
 977                            N_("whether the initial clone should follow the shallow recommendation")),
 978                OPT__QUIET(&suc.quiet, N_("don't print cloning progress")),
 979                OPT_BOOL(0, "progress", &suc.progress,
 980                            N_("force cloning progress")),
 981                OPT_END()
 982        };
 983
 984        const char *const git_submodule_helper_usage[] = {
 985                N_("git submodule--helper update_clone [--prefix=<path>] [<path>...]"),
 986                NULL
 987        };
 988        suc.prefix = prefix;
 989
 990        argc = parse_options(argc, argv, prefix, module_update_clone_options,
 991                             git_submodule_helper_usage, 0);
 992
 993        if (update)
 994                if (parse_submodule_update_strategy(update, &suc.update) < 0)
 995                        die(_("bad value for update parameter"));
 996
 997        if (module_list_compute(argc, argv, prefix, &pathspec, &suc.list) < 0)
 998                return 1;
 999
1000        if (pathspec.nr)
1001                suc.warn_if_uninitialized = 1;
1002
1003        /* Overlay the parsed .gitmodules file with .git/config */
1004        gitmodules_config();
1005        git_config(submodule_config, NULL);
1006
1007        if (max_jobs < 0)
1008                max_jobs = parallel_submodules();
1009
1010        run_processes_parallel(max_jobs,
1011                               update_clone_get_next_task,
1012                               update_clone_start_failure,
1013                               update_clone_task_finished,
1014                               &suc);
1015
1016        /*
1017         * We saved the output and put it out all at once now.
1018         * That means:
1019         * - the listener does not have to interleave their (checkout)
1020         *   work with our fetching.  The writes involved in a
1021         *   checkout involve more straightforward sequential I/O.
1022         * - the listener can avoid doing any work if fetching failed.
1023         */
1024        if (suc.quickstop)
1025                return 1;
1026
1027        for_each_string_list_item(item, &suc.projectlines)
1028                utf8_fprintf(stdout, "%s", item->string);
1029
1030        return 0;
1031}
1032
1033static int resolve_relative_path(int argc, const char **argv, const char *prefix)
1034{
1035        struct strbuf sb = STRBUF_INIT;
1036        if (argc != 3)
1037                die("submodule--helper relative-path takes exactly 2 arguments, got %d", argc);
1038
1039        printf("%s", relative_path(argv[1], argv[2], &sb));
1040        strbuf_release(&sb);
1041        return 0;
1042}
1043
1044static const char *remote_submodule_branch(const char *path)
1045{
1046        const struct submodule *sub;
1047        gitmodules_config();
1048        git_config(submodule_config, NULL);
1049
1050        sub = submodule_from_path(null_sha1, path);
1051        if (!sub)
1052                return NULL;
1053
1054        if (!sub->branch)
1055                return "master";
1056
1057        if (!strcmp(sub->branch, ".")) {
1058                unsigned char sha1[20];
1059                const char *refname = resolve_ref_unsafe("HEAD", 0, sha1, NULL);
1060
1061                if (!refname)
1062                        die(_("No such ref: %s"), "HEAD");
1063
1064                /* detached HEAD */
1065                if (!strcmp(refname, "HEAD"))
1066                        die(_("Submodule (%s) branch configured to inherit "
1067                              "branch from superproject, but the superproject "
1068                              "is not on any branch"), sub->name);
1069
1070                if (!skip_prefix(refname, "refs/heads/", &refname))
1071                        die(_("Expecting a full ref name, got %s"), refname);
1072                return refname;
1073        }
1074
1075        return sub->branch;
1076}
1077
1078static int resolve_remote_submodule_branch(int argc, const char **argv,
1079                const char *prefix)
1080{
1081        const char *ret;
1082        struct strbuf sb = STRBUF_INIT;
1083        if (argc != 2)
1084                die("submodule--helper remote-branch takes exactly one arguments, got %d", argc);
1085
1086        ret = remote_submodule_branch(argv[1]);
1087        if (!ret)
1088                die("submodule %s doesn't exist", argv[1]);
1089
1090        printf("%s", ret);
1091        strbuf_release(&sb);
1092        return 0;
1093}
1094
1095static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
1096{
1097        int i;
1098        struct pathspec pathspec;
1099        struct module_list list = MODULE_LIST_INIT;
1100        unsigned flags = ABSORB_GITDIR_RECURSE_SUBMODULES;
1101
1102        struct option embed_gitdir_options[] = {
1103                OPT_STRING(0, "prefix", &prefix,
1104                           N_("path"),
1105                           N_("path into the working tree")),
1106                OPT_BIT(0, "--recursive", &flags, N_("recurse into submodules"),
1107                        ABSORB_GITDIR_RECURSE_SUBMODULES),
1108                OPT_END()
1109        };
1110
1111        const char *const git_submodule_helper_usage[] = {
1112                N_("git submodule--helper embed-git-dir [<path>...]"),
1113                NULL
1114        };
1115
1116        argc = parse_options(argc, argv, prefix, embed_gitdir_options,
1117                             git_submodule_helper_usage, 0);
1118
1119        gitmodules_config();
1120        git_config(submodule_config, NULL);
1121
1122        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1123                return 1;
1124
1125        for (i = 0; i < list.nr; i++)
1126                absorb_git_dir_into_superproject(prefix,
1127                                list.entries[i]->name, flags);
1128
1129        return 0;
1130}
1131
1132#define SUPPORT_SUPER_PREFIX (1<<0)
1133
1134struct cmd_struct {
1135        const char *cmd;
1136        int (*fn)(int, const char **, const char *);
1137        unsigned option;
1138};
1139
1140static struct cmd_struct commands[] = {
1141        {"list", module_list, 0},
1142        {"name", module_name, 0},
1143        {"clone", module_clone, 0},
1144        {"update-clone", update_clone, 0},
1145        {"relative-path", resolve_relative_path, 0},
1146        {"resolve-relative-url", resolve_relative_url, 0},
1147        {"resolve-relative-url-test", resolve_relative_url_test, 0},
1148        {"init", module_init, SUPPORT_SUPER_PREFIX},
1149        {"remote-branch", resolve_remote_submodule_branch, 0},
1150        {"absorb-git-dirs", absorb_git_dirs, SUPPORT_SUPER_PREFIX},
1151};
1152
1153int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
1154{
1155        int i;
1156        if (argc < 2)
1157                die(_("submodule--helper subcommand must be "
1158                      "called with a subcommand"));
1159
1160        for (i = 0; i < ARRAY_SIZE(commands); i++) {
1161                if (!strcmp(argv[1], commands[i].cmd)) {
1162                        if (get_super_prefix() &&
1163                            !(commands[i].option & SUPPORT_SUPER_PREFIX))
1164                                die(_("%s doesn't support --super-prefix"),
1165                                    commands[i].cmd);
1166                        return commands[i].fn(argc - 1, argv + 1, prefix);
1167                }
1168        }
1169
1170        die(_("'%s' is not a valid submodule--helper "
1171              "subcommand"), argv[1]);
1172}