Andrew's git / gitweb.git / builtin/submodule--helper.c
?
builtin / submodule--helper.con commit Merge branch 'rs/apply-fuzzy-match-fix' into maint (df481b9)
   1#include "builtin.h"
   2#include "repository.h"
   3#include "cache.h"
   4#include "config.h"
   5#include "parse-options.h"
   6#include "quote.h"
   7#include "pathspec.h"
   8#include "dir.h"
   9#include "submodule.h"
  10#include "submodule-config.h"
  11#include "string-list.h"
  12#include "run-command.h"
  13#include "remote.h"
  14#include "refs.h"
  15#include "connect.h"
  16
  17static char *get_default_remote(void)
  18{
  19        char *dest = NULL, *ret;
  20        struct strbuf sb = STRBUF_INIT;
  21        const char *refname = resolve_ref_unsafe("HEAD", 0, NULL, 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                       prefix, argv);
 238
 239        if (pathspec->nr)
 240                ps_matched = xcalloc(pathspec->nr, 1);
 241
 242        if (read_cache() < 0)
 243                die(_("index file corrupt"));
 244
 245        for (i = 0; i < active_nr; i++) {
 246                const struct cache_entry *ce = active_cache[i];
 247
 248                if (!match_pathspec(pathspec, ce->name, ce_namelen(ce),
 249                                    0, ps_matched, 1) ||
 250                    !S_ISGITLINK(ce->ce_mode))
 251                        continue;
 252
 253                ALLOC_GROW(list->entries, list->nr + 1, list->alloc);
 254                list->entries[list->nr++] = ce;
 255                while (i + 1 < active_nr &&
 256                       !strcmp(ce->name, active_cache[i + 1]->name))
 257                        /*
 258                         * Skip entries with the same name in different stages
 259                         * to make sure an entry is returned only once.
 260                         */
 261                        i++;
 262        }
 263
 264        if (ps_matched && report_path_error(ps_matched, pathspec, prefix))
 265                result = -1;
 266
 267        free(ps_matched);
 268
 269        return result;
 270}
 271
 272static void module_list_active(struct module_list *list)
 273{
 274        int i;
 275        struct module_list active_modules = MODULE_LIST_INIT;
 276
 277        for (i = 0; i < list->nr; i++) {
 278                const struct cache_entry *ce = list->entries[i];
 279
 280                if (!is_submodule_active(the_repository, ce->name))
 281                        continue;
 282
 283                ALLOC_GROW(active_modules.entries,
 284                           active_modules.nr + 1,
 285                           active_modules.alloc);
 286                active_modules.entries[active_modules.nr++] = ce;
 287        }
 288
 289        free(list->entries);
 290        *list = active_modules;
 291}
 292
 293static int module_list(int argc, const char **argv, const char *prefix)
 294{
 295        int i;
 296        struct pathspec pathspec;
 297        struct module_list list = MODULE_LIST_INIT;
 298
 299        struct option module_list_options[] = {
 300                OPT_STRING(0, "prefix", &prefix,
 301                           N_("path"),
 302                           N_("alternative anchor for relative paths")),
 303                OPT_END()
 304        };
 305
 306        const char *const git_submodule_helper_usage[] = {
 307                N_("git submodule--helper list [--prefix=<path>] [<path>...]"),
 308                NULL
 309        };
 310
 311        argc = parse_options(argc, argv, prefix, module_list_options,
 312                             git_submodule_helper_usage, 0);
 313
 314        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 315                return 1;
 316
 317        for (i = 0; i < list.nr; i++) {
 318                const struct cache_entry *ce = list.entries[i];
 319
 320                if (ce_stage(ce))
 321                        printf("%06o %s U\t", ce->ce_mode, sha1_to_hex(null_sha1));
 322                else
 323                        printf("%06o %s %d\t", ce->ce_mode,
 324                               oid_to_hex(&ce->oid), ce_stage(ce));
 325
 326                fprintf(stdout, "%s\n", ce->name);
 327        }
 328        return 0;
 329}
 330
 331static void init_submodule(const char *path, const char *prefix, int quiet)
 332{
 333        const struct submodule *sub;
 334        struct strbuf sb = STRBUF_INIT;
 335        char *upd = NULL, *url = NULL, *displaypath;
 336
 337        if (prefix && get_super_prefix())
 338                die("BUG: cannot have prefix and superprefix");
 339        else if (prefix)
 340                displaypath = xstrdup(relative_path(path, prefix, &sb));
 341        else if (get_super_prefix()) {
 342                strbuf_addf(&sb, "%s%s", get_super_prefix(), path);
 343                displaypath = strbuf_detach(&sb, NULL);
 344        } else
 345                displaypath = xstrdup(path);
 346
 347        sub = submodule_from_path(&null_oid, path);
 348
 349        if (!sub)
 350                die(_("No url found for submodule path '%s' in .gitmodules"),
 351                        displaypath);
 352
 353        /*
 354         * NEEDSWORK: In a multi-working-tree world, this needs to be
 355         * set in the per-worktree config.
 356         *
 357         * Set active flag for the submodule being initialized
 358         */
 359        if (!is_submodule_active(the_repository, path)) {
 360                strbuf_reset(&sb);
 361                strbuf_addf(&sb, "submodule.%s.active", sub->name);
 362                git_config_set_gently(sb.buf, "true");
 363        }
 364
 365        /*
 366         * Copy url setting when it is not set yet.
 367         * To look up the url in .git/config, we must not fall back to
 368         * .gitmodules, so look it up directly.
 369         */
 370        strbuf_reset(&sb);
 371        strbuf_addf(&sb, "submodule.%s.url", sub->name);
 372        if (git_config_get_string(sb.buf, &url)) {
 373                if (!sub->url)
 374                        die(_("No url found for submodule path '%s' in .gitmodules"),
 375                                displaypath);
 376
 377                url = xstrdup(sub->url);
 378
 379                /* Possibly a url relative to parent */
 380                if (starts_with_dot_dot_slash(url) ||
 381                    starts_with_dot_slash(url)) {
 382                        char *remoteurl, *relurl;
 383                        char *remote = get_default_remote();
 384                        struct strbuf remotesb = STRBUF_INIT;
 385                        strbuf_addf(&remotesb, "remote.%s.url", remote);
 386                        free(remote);
 387
 388                        if (git_config_get_string(remotesb.buf, &remoteurl)) {
 389                                warning(_("could not lookup configuration '%s'. Assuming this repository is its own authoritative upstream."), remotesb.buf);
 390                                remoteurl = xgetcwd();
 391                        }
 392                        relurl = relative_url(remoteurl, url, NULL);
 393                        strbuf_release(&remotesb);
 394                        free(remoteurl);
 395                        free(url);
 396                        url = relurl;
 397                }
 398
 399                if (git_config_set_gently(sb.buf, url))
 400                        die(_("Failed to register url for submodule path '%s'"),
 401                            displaypath);
 402                if (!quiet)
 403                        fprintf(stderr,
 404                                _("Submodule '%s' (%s) registered for path '%s'\n"),
 405                                sub->name, url, displaypath);
 406        }
 407
 408        /* Copy "update" setting when it is not set yet */
 409        strbuf_reset(&sb);
 410        strbuf_addf(&sb, "submodule.%s.update", sub->name);
 411        if (git_config_get_string(sb.buf, &upd) &&
 412            sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
 413                if (sub->update_strategy.type == SM_UPDATE_COMMAND) {
 414                        fprintf(stderr, _("warning: command update mode suggested for submodule '%s'\n"),
 415                                sub->name);
 416                        upd = xstrdup("none");
 417                } else
 418                        upd = xstrdup(submodule_strategy_to_string(&sub->update_strategy));
 419
 420                if (git_config_set_gently(sb.buf, upd))
 421                        die(_("Failed to register update mode for submodule path '%s'"), displaypath);
 422        }
 423        strbuf_release(&sb);
 424        free(displaypath);
 425        free(url);
 426        free(upd);
 427}
 428
 429static int module_init(int argc, const char **argv, const char *prefix)
 430{
 431        struct pathspec pathspec;
 432        struct module_list list = MODULE_LIST_INIT;
 433        int quiet = 0;
 434        int i;
 435
 436        struct option module_init_options[] = {
 437                OPT__QUIET(&quiet, N_("Suppress output for initializing a submodule")),
 438                OPT_END()
 439        };
 440
 441        const char *const git_submodule_helper_usage[] = {
 442                N_("git submodule--helper init [<path>]"),
 443                NULL
 444        };
 445
 446        argc = parse_options(argc, argv, prefix, module_init_options,
 447                             git_submodule_helper_usage, 0);
 448
 449        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 450                return 1;
 451
 452        /*
 453         * If there are no path args and submodule.active is set then,
 454         * by default, only initialize 'active' modules.
 455         */
 456        if (!argc && git_config_get_value_multi("submodule.active"))
 457                module_list_active(&list);
 458
 459        for (i = 0; i < list.nr; i++)
 460                init_submodule(list.entries[i]->name, prefix, quiet);
 461
 462        return 0;
 463}
 464
 465static int module_name(int argc, const char **argv, const char *prefix)
 466{
 467        const struct submodule *sub;
 468
 469        if (argc != 2)
 470                usage(_("git submodule--helper name <path>"));
 471
 472        sub = submodule_from_path(&null_oid, argv[1]);
 473
 474        if (!sub)
 475                die(_("no submodule mapping found in .gitmodules for path '%s'"),
 476                    argv[1]);
 477
 478        printf("%s\n", sub->name);
 479
 480        return 0;
 481}
 482
 483static int clone_submodule(const char *path, const char *gitdir, const char *url,
 484                           const char *depth, struct string_list *reference,
 485                           int quiet, int progress)
 486{
 487        struct child_process cp = CHILD_PROCESS_INIT;
 488
 489        argv_array_push(&cp.args, "clone");
 490        argv_array_push(&cp.args, "--no-checkout");
 491        if (quiet)
 492                argv_array_push(&cp.args, "--quiet");
 493        if (progress)
 494                argv_array_push(&cp.args, "--progress");
 495        if (depth && *depth)
 496                argv_array_pushl(&cp.args, "--depth", depth, NULL);
 497        if (reference->nr) {
 498                struct string_list_item *item;
 499                for_each_string_list_item(item, reference)
 500                        argv_array_pushl(&cp.args, "--reference",
 501                                         item->string, NULL);
 502        }
 503        if (gitdir && *gitdir)
 504                argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
 505
 506        argv_array_push(&cp.args, url);
 507        argv_array_push(&cp.args, path);
 508
 509        cp.git_cmd = 1;
 510        prepare_submodule_repo_env(&cp.env_array);
 511        cp.no_stdin = 1;
 512
 513        return run_command(&cp);
 514}
 515
 516struct submodule_alternate_setup {
 517        const char *submodule_name;
 518        enum SUBMODULE_ALTERNATE_ERROR_MODE {
 519                SUBMODULE_ALTERNATE_ERROR_DIE,
 520                SUBMODULE_ALTERNATE_ERROR_INFO,
 521                SUBMODULE_ALTERNATE_ERROR_IGNORE
 522        } error_mode;
 523        struct string_list *reference;
 524};
 525#define SUBMODULE_ALTERNATE_SETUP_INIT { NULL, \
 526        SUBMODULE_ALTERNATE_ERROR_IGNORE, NULL }
 527
 528static int add_possible_reference_from_superproject(
 529                struct alternate_object_database *alt, void *sas_cb)
 530{
 531        struct submodule_alternate_setup *sas = sas_cb;
 532
 533        /*
 534         * If the alternate object store is another repository, try the
 535         * standard layout with .git/(modules/<name>)+/objects
 536         */
 537        if (ends_with(alt->path, "/objects")) {
 538                char *sm_alternate;
 539                struct strbuf sb = STRBUF_INIT;
 540                struct strbuf err = STRBUF_INIT;
 541                strbuf_add(&sb, alt->path, strlen(alt->path) - strlen("objects"));
 542
 543                /*
 544                 * We need to end the new path with '/' to mark it as a dir,
 545                 * otherwise a submodule name containing '/' will be broken
 546                 * as the last part of a missing submodule reference would
 547                 * be taken as a file name.
 548                 */
 549                strbuf_addf(&sb, "modules/%s/", sas->submodule_name);
 550
 551                sm_alternate = compute_alternate_path(sb.buf, &err);
 552                if (sm_alternate) {
 553                        string_list_append(sas->reference, xstrdup(sb.buf));
 554                        free(sm_alternate);
 555                } else {
 556                        switch (sas->error_mode) {
 557                        case SUBMODULE_ALTERNATE_ERROR_DIE:
 558                                die(_("submodule '%s' cannot add alternate: %s"),
 559                                    sas->submodule_name, err.buf);
 560                        case SUBMODULE_ALTERNATE_ERROR_INFO:
 561                                fprintf(stderr, _("submodule '%s' cannot add alternate: %s"),
 562                                        sas->submodule_name, err.buf);
 563                        case SUBMODULE_ALTERNATE_ERROR_IGNORE:
 564                                ; /* nothing */
 565                        }
 566                }
 567                strbuf_release(&sb);
 568        }
 569
 570        return 0;
 571}
 572
 573static void prepare_possible_alternates(const char *sm_name,
 574                struct string_list *reference)
 575{
 576        char *sm_alternate = NULL, *error_strategy = NULL;
 577        struct submodule_alternate_setup sas = SUBMODULE_ALTERNATE_SETUP_INIT;
 578
 579        git_config_get_string("submodule.alternateLocation", &sm_alternate);
 580        if (!sm_alternate)
 581                return;
 582
 583        git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
 584
 585        if (!error_strategy)
 586                error_strategy = xstrdup("die");
 587
 588        sas.submodule_name = sm_name;
 589        sas.reference = reference;
 590        if (!strcmp(error_strategy, "die"))
 591                sas.error_mode = SUBMODULE_ALTERNATE_ERROR_DIE;
 592        else if (!strcmp(error_strategy, "info"))
 593                sas.error_mode = SUBMODULE_ALTERNATE_ERROR_INFO;
 594        else if (!strcmp(error_strategy, "ignore"))
 595                sas.error_mode = SUBMODULE_ALTERNATE_ERROR_IGNORE;
 596        else
 597                die(_("Value '%s' for submodule.alternateErrorStrategy is not recognized"), error_strategy);
 598
 599        if (!strcmp(sm_alternate, "superproject"))
 600                foreach_alt_odb(add_possible_reference_from_superproject, &sas);
 601        else if (!strcmp(sm_alternate, "no"))
 602                ; /* do nothing */
 603        else
 604                die(_("Value '%s' for submodule.alternateLocation is not recognized"), sm_alternate);
 605
 606        free(sm_alternate);
 607        free(error_strategy);
 608}
 609
 610static int module_clone(int argc, const char **argv, const char *prefix)
 611{
 612        const char *name = NULL, *url = NULL, *depth = NULL;
 613        int quiet = 0;
 614        int progress = 0;
 615        char *p, *path = NULL, *sm_gitdir;
 616        struct strbuf sb = STRBUF_INIT;
 617        struct string_list reference = STRING_LIST_INIT_NODUP;
 618        char *sm_alternate = NULL, *error_strategy = NULL;
 619
 620        struct option module_clone_options[] = {
 621                OPT_STRING(0, "prefix", &prefix,
 622                           N_("path"),
 623                           N_("alternative anchor for relative paths")),
 624                OPT_STRING(0, "path", &path,
 625                           N_("path"),
 626                           N_("where the new submodule will be cloned to")),
 627                OPT_STRING(0, "name", &name,
 628                           N_("string"),
 629                           N_("name of the new submodule")),
 630                OPT_STRING(0, "url", &url,
 631                           N_("string"),
 632                           N_("url where to clone the submodule from")),
 633                OPT_STRING_LIST(0, "reference", &reference,
 634                           N_("repo"),
 635                           N_("reference repository")),
 636                OPT_STRING(0, "depth", &depth,
 637                           N_("string"),
 638                           N_("depth for shallow clones")),
 639                OPT__QUIET(&quiet, "Suppress output for cloning a submodule"),
 640                OPT_BOOL(0, "progress", &progress,
 641                           N_("force cloning progress")),
 642                OPT_END()
 643        };
 644
 645        const char *const git_submodule_helper_usage[] = {
 646                N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
 647                   "[--reference <repository>] [--name <name>] [--depth <depth>] "
 648                   "--url <url> --path <path>"),
 649                NULL
 650        };
 651
 652        argc = parse_options(argc, argv, prefix, module_clone_options,
 653                             git_submodule_helper_usage, 0);
 654
 655        if (argc || !url || !path || !*path)
 656                usage_with_options(git_submodule_helper_usage,
 657                                   module_clone_options);
 658
 659        strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
 660        sm_gitdir = absolute_pathdup(sb.buf);
 661        strbuf_reset(&sb);
 662
 663        if (!is_absolute_path(path)) {
 664                strbuf_addf(&sb, "%s/%s", get_git_work_tree(), path);
 665                path = strbuf_detach(&sb, NULL);
 666        } else
 667                path = xstrdup(path);
 668
 669        if (!file_exists(sm_gitdir)) {
 670                if (safe_create_leading_directories_const(sm_gitdir) < 0)
 671                        die(_("could not create directory '%s'"), sm_gitdir);
 672
 673                prepare_possible_alternates(name, &reference);
 674
 675                if (clone_submodule(path, sm_gitdir, url, depth, &reference,
 676                                    quiet, progress))
 677                        die(_("clone of '%s' into submodule path '%s' failed"),
 678                            url, path);
 679        } else {
 680                if (safe_create_leading_directories_const(path) < 0)
 681                        die(_("could not create directory '%s'"), path);
 682                strbuf_addf(&sb, "%s/index", sm_gitdir);
 683                unlink_or_warn(sb.buf);
 684                strbuf_reset(&sb);
 685        }
 686
 687        /* Connect module worktree and git dir */
 688        connect_work_tree_and_git_dir(path, sm_gitdir);
 689
 690        p = git_pathdup_submodule(path, "config");
 691        if (!p)
 692                die(_("could not get submodule directory for '%s'"), path);
 693
 694        /* setup alternateLocation and alternateErrorStrategy in the cloned submodule if needed */
 695        git_config_get_string("submodule.alternateLocation", &sm_alternate);
 696        if (sm_alternate)
 697                git_config_set_in_file(p, "submodule.alternateLocation",
 698                                           sm_alternate);
 699        git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
 700        if (error_strategy)
 701                git_config_set_in_file(p, "submodule.alternateErrorStrategy",
 702                                           error_strategy);
 703
 704        free(sm_alternate);
 705        free(error_strategy);
 706
 707        strbuf_release(&sb);
 708        free(sm_gitdir);
 709        free(path);
 710        free(p);
 711        return 0;
 712}
 713
 714struct submodule_update_clone {
 715        /* index into 'list', the list of submodules to look into for cloning */
 716        int current;
 717        struct module_list list;
 718        unsigned warn_if_uninitialized : 1;
 719
 720        /* update parameter passed via commandline */
 721        struct submodule_update_strategy update;
 722
 723        /* configuration parameters which are passed on to the children */
 724        int progress;
 725        int quiet;
 726        int recommend_shallow;
 727        struct string_list references;
 728        const char *depth;
 729        const char *recursive_prefix;
 730        const char *prefix;
 731
 732        /* Machine-readable status lines to be consumed by git-submodule.sh */
 733        struct string_list projectlines;
 734
 735        /* If we want to stop as fast as possible and return an error */
 736        unsigned quickstop : 1;
 737
 738        /* failed clones to be retried again */
 739        const struct cache_entry **failed_clones;
 740        int failed_clones_nr, failed_clones_alloc;
 741};
 742#define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
 743        SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, \
 744        NULL, NULL, NULL, \
 745        STRING_LIST_INIT_DUP, 0, NULL, 0, 0}
 746
 747
 748static void next_submodule_warn_missing(struct submodule_update_clone *suc,
 749                struct strbuf *out, const char *displaypath)
 750{
 751        /*
 752         * Only mention uninitialized submodules when their
 753         * paths have been specified.
 754         */
 755        if (suc->warn_if_uninitialized) {
 756                strbuf_addf(out,
 757                        _("Submodule path '%s' not initialized"),
 758                        displaypath);
 759                strbuf_addch(out, '\n');
 760                strbuf_addstr(out,
 761                        _("Maybe you want to use 'update --init'?"));
 762                strbuf_addch(out, '\n');
 763        }
 764}
 765
 766/**
 767 * Determine whether 'ce' needs to be cloned. If so, prepare the 'child' to
 768 * run the clone. Returns 1 if 'ce' needs to be cloned, 0 otherwise.
 769 */
 770static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
 771                                           struct child_process *child,
 772                                           struct submodule_update_clone *suc,
 773                                           struct strbuf *out)
 774{
 775        const struct submodule *sub = NULL;
 776        const char *url = NULL;
 777        const char *update_string;
 778        enum submodule_update_type update_type;
 779        char *key;
 780        struct strbuf displaypath_sb = STRBUF_INIT;
 781        struct strbuf sb = STRBUF_INIT;
 782        const char *displaypath = NULL;
 783        int needs_cloning = 0;
 784
 785        if (ce_stage(ce)) {
 786                if (suc->recursive_prefix)
 787                        strbuf_addf(&sb, "%s/%s", suc->recursive_prefix, ce->name);
 788                else
 789                        strbuf_addstr(&sb, ce->name);
 790                strbuf_addf(out, _("Skipping unmerged submodule %s"), sb.buf);
 791                strbuf_addch(out, '\n');
 792                goto cleanup;
 793        }
 794
 795        sub = submodule_from_path(&null_oid, ce->name);
 796
 797        if (suc->recursive_prefix)
 798                displaypath = relative_path(suc->recursive_prefix,
 799                                            ce->name, &displaypath_sb);
 800        else
 801                displaypath = ce->name;
 802
 803        if (!sub) {
 804                next_submodule_warn_missing(suc, out, displaypath);
 805                goto cleanup;
 806        }
 807
 808        key = xstrfmt("submodule.%s.update", sub->name);
 809        if (!repo_config_get_string_const(the_repository, key, &update_string)) {
 810                update_type = parse_submodule_update_type(update_string);
 811        } else {
 812                update_type = sub->update_strategy.type;
 813        }
 814        free(key);
 815
 816        if (suc->update.type == SM_UPDATE_NONE
 817            || (suc->update.type == SM_UPDATE_UNSPECIFIED
 818                && update_type == SM_UPDATE_NONE)) {
 819                strbuf_addf(out, _("Skipping submodule '%s'"), displaypath);
 820                strbuf_addch(out, '\n');
 821                goto cleanup;
 822        }
 823
 824        /* Check if the submodule has been initialized. */
 825        if (!is_submodule_active(the_repository, ce->name)) {
 826                next_submodule_warn_missing(suc, out, displaypath);
 827                goto cleanup;
 828        }
 829
 830        strbuf_reset(&sb);
 831        strbuf_addf(&sb, "submodule.%s.url", sub->name);
 832        if (repo_config_get_string_const(the_repository, sb.buf, &url))
 833                url = sub->url;
 834
 835        strbuf_reset(&sb);
 836        strbuf_addf(&sb, "%s/.git", ce->name);
 837        needs_cloning = !file_exists(sb.buf);
 838
 839        strbuf_reset(&sb);
 840        strbuf_addf(&sb, "%06o %s %d %d\t%s\n", ce->ce_mode,
 841                        oid_to_hex(&ce->oid), ce_stage(ce),
 842                        needs_cloning, ce->name);
 843        string_list_append(&suc->projectlines, sb.buf);
 844
 845        if (!needs_cloning)
 846                goto cleanup;
 847
 848        child->git_cmd = 1;
 849        child->no_stdin = 1;
 850        child->stdout_to_stderr = 1;
 851        child->err = -1;
 852        argv_array_push(&child->args, "submodule--helper");
 853        argv_array_push(&child->args, "clone");
 854        if (suc->progress)
 855                argv_array_push(&child->args, "--progress");
 856        if (suc->quiet)
 857                argv_array_push(&child->args, "--quiet");
 858        if (suc->prefix)
 859                argv_array_pushl(&child->args, "--prefix", suc->prefix, NULL);
 860        if (suc->recommend_shallow && sub->recommend_shallow == 1)
 861                argv_array_push(&child->args, "--depth=1");
 862        argv_array_pushl(&child->args, "--path", sub->path, NULL);
 863        argv_array_pushl(&child->args, "--name", sub->name, NULL);
 864        argv_array_pushl(&child->args, "--url", url, NULL);
 865        if (suc->references.nr) {
 866                struct string_list_item *item;
 867                for_each_string_list_item(item, &suc->references)
 868                        argv_array_pushl(&child->args, "--reference", item->string, NULL);
 869        }
 870        if (suc->depth)
 871                argv_array_push(&child->args, suc->depth);
 872
 873cleanup:
 874        strbuf_reset(&displaypath_sb);
 875        strbuf_reset(&sb);
 876
 877        return needs_cloning;
 878}
 879
 880static int update_clone_get_next_task(struct child_process *child,
 881                                      struct strbuf *err,
 882                                      void *suc_cb,
 883                                      void **idx_task_cb)
 884{
 885        struct submodule_update_clone *suc = suc_cb;
 886        const struct cache_entry *ce;
 887        int index;
 888
 889        for (; suc->current < suc->list.nr; suc->current++) {
 890                ce = suc->list.entries[suc->current];
 891                if (prepare_to_clone_next_submodule(ce, child, suc, err)) {
 892                        int *p = xmalloc(sizeof(*p));
 893                        *p = suc->current;
 894                        *idx_task_cb = p;
 895                        suc->current++;
 896                        return 1;
 897                }
 898        }
 899
 900        /*
 901         * The loop above tried cloning each submodule once, now try the
 902         * stragglers again, which we can imagine as an extension of the
 903         * entry list.
 904         */
 905        index = suc->current - suc->list.nr;
 906        if (index < suc->failed_clones_nr) {
 907                int *p;
 908                ce = suc->failed_clones[index];
 909                if (!prepare_to_clone_next_submodule(ce, child, suc, err)) {
 910                        suc->current ++;
 911                        strbuf_addstr(err, "BUG: submodule considered for "
 912                                           "cloning, doesn't need cloning "
 913                                           "any more?\n");
 914                        return 0;
 915                }
 916                p = xmalloc(sizeof(*p));
 917                *p = suc->current;
 918                *idx_task_cb = p;
 919                suc->current ++;
 920                return 1;
 921        }
 922
 923        return 0;
 924}
 925
 926static int update_clone_start_failure(struct strbuf *err,
 927                                      void *suc_cb,
 928                                      void *idx_task_cb)
 929{
 930        struct submodule_update_clone *suc = suc_cb;
 931        suc->quickstop = 1;
 932        return 1;
 933}
 934
 935static int update_clone_task_finished(int result,
 936                                      struct strbuf *err,
 937                                      void *suc_cb,
 938                                      void *idx_task_cb)
 939{
 940        const struct cache_entry *ce;
 941        struct submodule_update_clone *suc = suc_cb;
 942
 943        int *idxP = idx_task_cb;
 944        int idx = *idxP;
 945        free(idxP);
 946
 947        if (!result)
 948                return 0;
 949
 950        if (idx < suc->list.nr) {
 951                ce  = suc->list.entries[idx];
 952                strbuf_addf(err, _("Failed to clone '%s'. Retry scheduled"),
 953                            ce->name);
 954                strbuf_addch(err, '\n');
 955                ALLOC_GROW(suc->failed_clones,
 956                           suc->failed_clones_nr + 1,
 957                           suc->failed_clones_alloc);
 958                suc->failed_clones[suc->failed_clones_nr++] = ce;
 959                return 0;
 960        } else {
 961                idx -= suc->list.nr;
 962                ce  = suc->failed_clones[idx];
 963                strbuf_addf(err, _("Failed to clone '%s' a second time, aborting"),
 964                            ce->name);
 965                strbuf_addch(err, '\n');
 966                suc->quickstop = 1;
 967                return 1;
 968        }
 969
 970        return 0;
 971}
 972
 973static int gitmodules_update_clone_config(const char *var, const char *value,
 974                                          void *cb)
 975{
 976        int *max_jobs = cb;
 977        if (!strcmp(var, "submodule.fetchjobs"))
 978                *max_jobs = parse_submodule_fetchjobs(var, value);
 979        return 0;
 980}
 981
 982static int update_clone(int argc, const char **argv, const char *prefix)
 983{
 984        const char *update = NULL;
 985        int max_jobs = 1;
 986        struct string_list_item *item;
 987        struct pathspec pathspec;
 988        struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
 989
 990        struct option module_update_clone_options[] = {
 991                OPT_STRING(0, "prefix", &prefix,
 992                           N_("path"),
 993                           N_("path into the working tree")),
 994                OPT_STRING(0, "recursive-prefix", &suc.recursive_prefix,
 995                           N_("path"),
 996                           N_("path into the working tree, across nested "
 997                              "submodule boundaries")),
 998                OPT_STRING(0, "update", &update,
 999                           N_("string"),
1000                           N_("rebase, merge, checkout or none")),
1001                OPT_STRING_LIST(0, "reference", &suc.references, N_("repo"),
1002                           N_("reference repository")),
1003                OPT_STRING(0, "depth", &suc.depth, "<depth>",
1004                           N_("Create a shallow clone truncated to the "
1005                              "specified number of revisions")),
1006                OPT_INTEGER('j', "jobs", &max_jobs,
1007                            N_("parallel jobs")),
1008                OPT_BOOL(0, "recommend-shallow", &suc.recommend_shallow,
1009                            N_("whether the initial clone should follow the shallow recommendation")),
1010                OPT__QUIET(&suc.quiet, N_("don't print cloning progress")),
1011                OPT_BOOL(0, "progress", &suc.progress,
1012                            N_("force cloning progress")),
1013                OPT_END()
1014        };
1015
1016        const char *const git_submodule_helper_usage[] = {
1017                N_("git submodule--helper update_clone [--prefix=<path>] [<path>...]"),
1018                NULL
1019        };
1020        suc.prefix = prefix;
1021
1022        config_from_gitmodules(gitmodules_update_clone_config, &max_jobs);
1023        git_config(gitmodules_update_clone_config, &max_jobs);
1024
1025        argc = parse_options(argc, argv, prefix, module_update_clone_options,
1026                             git_submodule_helper_usage, 0);
1027
1028        if (update)
1029                if (parse_submodule_update_strategy(update, &suc.update) < 0)
1030                        die(_("bad value for update parameter"));
1031
1032        if (module_list_compute(argc, argv, prefix, &pathspec, &suc.list) < 0)
1033                return 1;
1034
1035        if (pathspec.nr)
1036                suc.warn_if_uninitialized = 1;
1037
1038        run_processes_parallel(max_jobs,
1039                               update_clone_get_next_task,
1040                               update_clone_start_failure,
1041                               update_clone_task_finished,
1042                               &suc);
1043
1044        /*
1045         * We saved the output and put it out all at once now.
1046         * That means:
1047         * - the listener does not have to interleave their (checkout)
1048         *   work with our fetching.  The writes involved in a
1049         *   checkout involve more straightforward sequential I/O.
1050         * - the listener can avoid doing any work if fetching failed.
1051         */
1052        if (suc.quickstop)
1053                return 1;
1054
1055        for_each_string_list_item(item, &suc.projectlines)
1056                fprintf(stdout, "%s", item->string);
1057
1058        return 0;
1059}
1060
1061static int resolve_relative_path(int argc, const char **argv, const char *prefix)
1062{
1063        struct strbuf sb = STRBUF_INIT;
1064        if (argc != 3)
1065                die("submodule--helper relative-path takes exactly 2 arguments, got %d", argc);
1066
1067        printf("%s", relative_path(argv[1], argv[2], &sb));
1068        strbuf_release(&sb);
1069        return 0;
1070}
1071
1072static const char *remote_submodule_branch(const char *path)
1073{
1074        const struct submodule *sub;
1075        const char *branch = NULL;
1076        char *key;
1077
1078        sub = submodule_from_path(&null_oid, path);
1079        if (!sub)
1080                return NULL;
1081
1082        key = xstrfmt("submodule.%s.branch", sub->name);
1083        if (repo_config_get_string_const(the_repository, key, &branch))
1084                branch = sub->branch;
1085        free(key);
1086
1087        if (!branch)
1088                return "master";
1089
1090        if (!strcmp(branch, ".")) {
1091                const char *refname = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
1092
1093                if (!refname)
1094                        die(_("No such ref: %s"), "HEAD");
1095
1096                /* detached HEAD */
1097                if (!strcmp(refname, "HEAD"))
1098                        die(_("Submodule (%s) branch configured to inherit "
1099                              "branch from superproject, but the superproject "
1100                              "is not on any branch"), sub->name);
1101
1102                if (!skip_prefix(refname, "refs/heads/", &refname))
1103                        die(_("Expecting a full ref name, got %s"), refname);
1104                return refname;
1105        }
1106
1107        return branch;
1108}
1109
1110static int resolve_remote_submodule_branch(int argc, const char **argv,
1111                const char *prefix)
1112{
1113        const char *ret;
1114        struct strbuf sb = STRBUF_INIT;
1115        if (argc != 2)
1116                die("submodule--helper remote-branch takes exactly one arguments, got %d", argc);
1117
1118        ret = remote_submodule_branch(argv[1]);
1119        if (!ret)
1120                die("submodule %s doesn't exist", argv[1]);
1121
1122        printf("%s", ret);
1123        strbuf_release(&sb);
1124        return 0;
1125}
1126
1127static int push_check(int argc, const char **argv, const char *prefix)
1128{
1129        struct remote *remote;
1130        const char *superproject_head;
1131        char *head;
1132        int detached_head = 0;
1133        struct object_id head_oid;
1134
1135        if (argc < 3)
1136                die("submodule--helper push-check requires at least 2 arguments");
1137
1138        /*
1139         * superproject's resolved head ref.
1140         * if HEAD then the superproject is in a detached head state, otherwise
1141         * it will be the resolved head ref.
1142         */
1143        superproject_head = argv[1];
1144        argv++;
1145        argc--;
1146        /* Get the submodule's head ref and determine if it is detached */
1147        head = resolve_refdup("HEAD", 0, head_oid.hash, NULL);
1148        if (!head)
1149                die(_("Failed to resolve HEAD as a valid ref."));
1150        if (!strcmp(head, "HEAD"))
1151                detached_head = 1;
1152
1153        /*
1154         * The remote must be configured.
1155         * This is to avoid pushing to the exact same URL as the parent.
1156         */
1157        remote = pushremote_get(argv[1]);
1158        if (!remote || remote->origin == REMOTE_UNCONFIGURED)
1159                die("remote '%s' not configured", argv[1]);
1160
1161        /* Check the refspec */
1162        if (argc > 2) {
1163                int i, refspec_nr = argc - 2;
1164                struct ref *local_refs = get_local_heads();
1165                struct refspec *refspec = parse_push_refspec(refspec_nr,
1166                                                             argv + 2);
1167
1168                for (i = 0; i < refspec_nr; i++) {
1169                        struct refspec *rs = refspec + i;
1170
1171                        if (rs->pattern || rs->matching)
1172                                continue;
1173
1174                        /* LHS must match a single ref */
1175                        switch (count_refspec_match(rs->src, local_refs, NULL)) {
1176                        case 1:
1177                                break;
1178                        case 0:
1179                                /*
1180                                 * If LHS matches 'HEAD' then we need to ensure
1181                                 * that it matches the same named branch
1182                                 * checked out in the superproject.
1183                                 */
1184                                if (!strcmp(rs->src, "HEAD")) {
1185                                        if (!detached_head &&
1186                                            !strcmp(head, superproject_head))
1187                                                break;
1188                                        die("HEAD does not match the named branch in the superproject");
1189                                }
1190                                /* fallthrough */
1191                        default:
1192                                die("src refspec '%s' must name a ref",
1193                                    rs->src);
1194                        }
1195                }
1196                free_refspec(refspec_nr, refspec);
1197        }
1198        free(head);
1199
1200        return 0;
1201}
1202
1203static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
1204{
1205        int i;
1206        struct pathspec pathspec;
1207        struct module_list list = MODULE_LIST_INIT;
1208        unsigned flags = ABSORB_GITDIR_RECURSE_SUBMODULES;
1209
1210        struct option embed_gitdir_options[] = {
1211                OPT_STRING(0, "prefix", &prefix,
1212                           N_("path"),
1213                           N_("path into the working tree")),
1214                OPT_BIT(0, "--recursive", &flags, N_("recurse into submodules"),
1215                        ABSORB_GITDIR_RECURSE_SUBMODULES),
1216                OPT_END()
1217        };
1218
1219        const char *const git_submodule_helper_usage[] = {
1220                N_("git submodule--helper embed-git-dir [<path>...]"),
1221                NULL
1222        };
1223
1224        argc = parse_options(argc, argv, prefix, embed_gitdir_options,
1225                             git_submodule_helper_usage, 0);
1226
1227        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1228                return 1;
1229
1230        for (i = 0; i < list.nr; i++)
1231                absorb_git_dir_into_superproject(prefix,
1232                                list.entries[i]->name, flags);
1233
1234        return 0;
1235}
1236
1237static int is_active(int argc, const char **argv, const char *prefix)
1238{
1239        if (argc != 2)
1240                die("submodule--helper is-active takes exactly 1 argument");
1241
1242        return !is_submodule_active(the_repository, argv[1]);
1243}
1244
1245#define SUPPORT_SUPER_PREFIX (1<<0)
1246
1247struct cmd_struct {
1248        const char *cmd;
1249        int (*fn)(int, const char **, const char *);
1250        unsigned option;
1251};
1252
1253static struct cmd_struct commands[] = {
1254        {"list", module_list, 0},
1255        {"name", module_name, 0},
1256        {"clone", module_clone, 0},
1257        {"update-clone", update_clone, 0},
1258        {"relative-path", resolve_relative_path, 0},
1259        {"resolve-relative-url", resolve_relative_url, 0},
1260        {"resolve-relative-url-test", resolve_relative_url_test, 0},
1261        {"init", module_init, SUPPORT_SUPER_PREFIX},
1262        {"remote-branch", resolve_remote_submodule_branch, 0},
1263        {"push-check", push_check, 0},
1264        {"absorb-git-dirs", absorb_git_dirs, SUPPORT_SUPER_PREFIX},
1265        {"is-active", is_active, 0},
1266};
1267
1268int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
1269{
1270        int i;
1271        if (argc < 2 || !strcmp(argv[1], "-h"))
1272                usage("git submodule--helper <command>");
1273
1274        for (i = 0; i < ARRAY_SIZE(commands); i++) {
1275                if (!strcmp(argv[1], commands[i].cmd)) {
1276                        if (get_super_prefix() &&
1277                            !(commands[i].option & SUPPORT_SUPER_PREFIX))
1278                                die(_("%s doesn't support --super-prefix"),
1279                                    commands[i].cmd);
1280                        return commands[i].fn(argc - 1, argv + 1, prefix);
1281                }
1282        }
1283
1284        die(_("'%s' is not a valid submodule--helper "
1285              "subcommand"), argv[1]);
1286}