Andrew's git / gitweb.git / builtin/submodule--helper.c
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builtin / submodule--helper.con commit submodule: fixup nested submodules after moving the submodule (da62f78)
   1#include "builtin.h"
   2#include "repository.h"
   3#include "cache.h"
   4#include "config.h"
   5#include "parse-options.h"
   6#include "quote.h"
   7#include "pathspec.h"
   8#include "dir.h"
   9#include "submodule.h"
  10#include "submodule-config.h"
  11#include "string-list.h"
  12#include "run-command.h"
  13#include "remote.h"
  14#include "refs.h"
  15#include "connect.h"
  16#include "revision.h"
  17#include "diffcore.h"
  18#include "diff.h"
  19#include "object-store.h"
  20
  21#define OPT_QUIET (1 << 0)
  22#define OPT_CACHED (1 << 1)
  23#define OPT_RECURSIVE (1 << 2)
  24#define OPT_FORCE (1 << 3)
  25
  26typedef void (*each_submodule_fn)(const struct cache_entry *list_item,
  27                                  void *cb_data);
  28
  29static char *get_default_remote(void)
  30{
  31        char *dest = NULL, *ret;
  32        struct strbuf sb = STRBUF_INIT;
  33        const char *refname = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
  34
  35        if (!refname)
  36                die(_("No such ref: %s"), "HEAD");
  37
  38        /* detached HEAD */
  39        if (!strcmp(refname, "HEAD"))
  40                return xstrdup("origin");
  41
  42        if (!skip_prefix(refname, "refs/heads/", &refname))
  43                die(_("Expecting a full ref name, got %s"), refname);
  44
  45        strbuf_addf(&sb, "branch.%s.remote", refname);
  46        if (git_config_get_string(sb.buf, &dest))
  47                ret = xstrdup("origin");
  48        else
  49                ret = dest;
  50
  51        strbuf_release(&sb);
  52        return ret;
  53}
  54
  55static int print_default_remote(int argc, const char **argv, const char *prefix)
  56{
  57        const char *remote;
  58
  59        if (argc != 1)
  60                die(_("submodule--helper print-default-remote takes no arguments"));
  61
  62        remote = get_default_remote();
  63        if (remote)
  64                printf("%s\n", remote);
  65
  66        return 0;
  67}
  68
  69static int starts_with_dot_slash(const char *str)
  70{
  71        return str[0] == '.' && is_dir_sep(str[1]);
  72}
  73
  74static int starts_with_dot_dot_slash(const char *str)
  75{
  76        return str[0] == '.' && str[1] == '.' && is_dir_sep(str[2]);
  77}
  78
  79/*
  80 * Returns 1 if it was the last chop before ':'.
  81 */
  82static int chop_last_dir(char **remoteurl, int is_relative)
  83{
  84        char *rfind = find_last_dir_sep(*remoteurl);
  85        if (rfind) {
  86                *rfind = '\0';
  87                return 0;
  88        }
  89
  90        rfind = strrchr(*remoteurl, ':');
  91        if (rfind) {
  92                *rfind = '\0';
  93                return 1;
  94        }
  95
  96        if (is_relative || !strcmp(".", *remoteurl))
  97                die(_("cannot strip one component off url '%s'"),
  98                        *remoteurl);
  99
 100        free(*remoteurl);
 101        *remoteurl = xstrdup(".");
 102        return 0;
 103}
 104
 105/*
 106 * The `url` argument is the URL that navigates to the submodule origin
 107 * repo. When relative, this URL is relative to the superproject origin
 108 * URL repo. The `up_path` argument, if specified, is the relative
 109 * path that navigates from the submodule working tree to the superproject
 110 * working tree. Returns the origin URL of the submodule.
 111 *
 112 * Return either an absolute URL or filesystem path (if the superproject
 113 * origin URL is an absolute URL or filesystem path, respectively) or a
 114 * relative file system path (if the superproject origin URL is a relative
 115 * file system path).
 116 *
 117 * When the output is a relative file system path, the path is either
 118 * relative to the submodule working tree, if up_path is specified, or to
 119 * the superproject working tree otherwise.
 120 *
 121 * NEEDSWORK: This works incorrectly on the domain and protocol part.
 122 * remote_url      url              outcome          expectation
 123 * http://a.com/b  ../c             http://a.com/c   as is
 124 * http://a.com/b/ ../c             http://a.com/c   same as previous line, but
 125 *                                                   ignore trailing slash in url
 126 * http://a.com/b  ../../c          http://c         error out
 127 * http://a.com/b  ../../../c       http:/c          error out
 128 * http://a.com/b  ../../../../c    http:c           error out
 129 * http://a.com/b  ../../../../../c    .:c           error out
 130 * NEEDSWORK: Given how chop_last_dir() works, this function is broken
 131 * when a local part has a colon in its path component, too.
 132 */
 133static char *relative_url(const char *remote_url,
 134                                const char *url,
 135                                const char *up_path)
 136{
 137        int is_relative = 0;
 138        int colonsep = 0;
 139        char *out;
 140        char *remoteurl = xstrdup(remote_url);
 141        struct strbuf sb = STRBUF_INIT;
 142        size_t len = strlen(remoteurl);
 143
 144        if (is_dir_sep(remoteurl[len-1]))
 145                remoteurl[len-1] = '\0';
 146
 147        if (!url_is_local_not_ssh(remoteurl) || is_absolute_path(remoteurl))
 148                is_relative = 0;
 149        else {
 150                is_relative = 1;
 151                /*
 152                 * Prepend a './' to ensure all relative
 153                 * remoteurls start with './' or '../'
 154                 */
 155                if (!starts_with_dot_slash(remoteurl) &&
 156                    !starts_with_dot_dot_slash(remoteurl)) {
 157                        strbuf_reset(&sb);
 158                        strbuf_addf(&sb, "./%s", remoteurl);
 159                        free(remoteurl);
 160                        remoteurl = strbuf_detach(&sb, NULL);
 161                }
 162        }
 163        /*
 164         * When the url starts with '../', remove that and the
 165         * last directory in remoteurl.
 166         */
 167        while (url) {
 168                if (starts_with_dot_dot_slash(url)) {
 169                        url += 3;
 170                        colonsep |= chop_last_dir(&remoteurl, is_relative);
 171                } else if (starts_with_dot_slash(url))
 172                        url += 2;
 173                else
 174                        break;
 175        }
 176        strbuf_reset(&sb);
 177        strbuf_addf(&sb, "%s%s%s", remoteurl, colonsep ? ":" : "/", url);
 178        if (ends_with(url, "/"))
 179                strbuf_setlen(&sb, sb.len - 1);
 180        free(remoteurl);
 181
 182        if (starts_with_dot_slash(sb.buf))
 183                out = xstrdup(sb.buf + 2);
 184        else
 185                out = xstrdup(sb.buf);
 186        strbuf_reset(&sb);
 187
 188        if (!up_path || !is_relative)
 189                return out;
 190
 191        strbuf_addf(&sb, "%s%s", up_path, out);
 192        free(out);
 193        return strbuf_detach(&sb, NULL);
 194}
 195
 196static int resolve_relative_url(int argc, const char **argv, const char *prefix)
 197{
 198        char *remoteurl = NULL;
 199        char *remote = get_default_remote();
 200        const char *up_path = NULL;
 201        char *res;
 202        const char *url;
 203        struct strbuf sb = STRBUF_INIT;
 204
 205        if (argc != 2 && argc != 3)
 206                die("resolve-relative-url only accepts one or two arguments");
 207
 208        url = argv[1];
 209        strbuf_addf(&sb, "remote.%s.url", remote);
 210        free(remote);
 211
 212        if (git_config_get_string(sb.buf, &remoteurl))
 213                /* the repository is its own authoritative upstream */
 214                remoteurl = xgetcwd();
 215
 216        if (argc == 3)
 217                up_path = argv[2];
 218
 219        res = relative_url(remoteurl, url, up_path);
 220        puts(res);
 221        free(res);
 222        free(remoteurl);
 223        return 0;
 224}
 225
 226static int resolve_relative_url_test(int argc, const char **argv, const char *prefix)
 227{
 228        char *remoteurl, *res;
 229        const char *up_path, *url;
 230
 231        if (argc != 4)
 232                die("resolve-relative-url-test only accepts three arguments: <up_path> <remoteurl> <url>");
 233
 234        up_path = argv[1];
 235        remoteurl = xstrdup(argv[2]);
 236        url = argv[3];
 237
 238        if (!strcmp(up_path, "(null)"))
 239                up_path = NULL;
 240
 241        res = relative_url(remoteurl, url, up_path);
 242        puts(res);
 243        free(res);
 244        free(remoteurl);
 245        return 0;
 246}
 247
 248/* the result should be freed by the caller. */
 249static char *get_submodule_displaypath(const char *path, const char *prefix)
 250{
 251        const char *super_prefix = get_super_prefix();
 252
 253        if (prefix && super_prefix) {
 254                BUG("cannot have prefix '%s' and superprefix '%s'",
 255                    prefix, super_prefix);
 256        } else if (prefix) {
 257                struct strbuf sb = STRBUF_INIT;
 258                char *displaypath = xstrdup(relative_path(path, prefix, &sb));
 259                strbuf_release(&sb);
 260                return displaypath;
 261        } else if (super_prefix) {
 262                return xstrfmt("%s%s", super_prefix, path);
 263        } else {
 264                return xstrdup(path);
 265        }
 266}
 267
 268static char *compute_rev_name(const char *sub_path, const char* object_id)
 269{
 270        struct strbuf sb = STRBUF_INIT;
 271        const char ***d;
 272
 273        static const char *describe_bare[] = { NULL };
 274
 275        static const char *describe_tags[] = { "--tags", NULL };
 276
 277        static const char *describe_contains[] = { "--contains", NULL };
 278
 279        static const char *describe_all_always[] = { "--all", "--always", NULL };
 280
 281        static const char **describe_argv[] = { describe_bare, describe_tags,
 282                                                describe_contains,
 283                                                describe_all_always, NULL };
 284
 285        for (d = describe_argv; *d; d++) {
 286                struct child_process cp = CHILD_PROCESS_INIT;
 287                prepare_submodule_repo_env(&cp.env_array);
 288                cp.dir = sub_path;
 289                cp.git_cmd = 1;
 290                cp.no_stderr = 1;
 291
 292                argv_array_push(&cp.args, "describe");
 293                argv_array_pushv(&cp.args, *d);
 294                argv_array_push(&cp.args, object_id);
 295
 296                if (!capture_command(&cp, &sb, 0)) {
 297                        strbuf_strip_suffix(&sb, "\n");
 298                        return strbuf_detach(&sb, NULL);
 299                }
 300        }
 301
 302        strbuf_release(&sb);
 303        return NULL;
 304}
 305
 306struct module_list {
 307        const struct cache_entry **entries;
 308        int alloc, nr;
 309};
 310#define MODULE_LIST_INIT { NULL, 0, 0 }
 311
 312static int module_list_compute(int argc, const char **argv,
 313                               const char *prefix,
 314                               struct pathspec *pathspec,
 315                               struct module_list *list)
 316{
 317        int i, result = 0;
 318        char *ps_matched = NULL;
 319        parse_pathspec(pathspec, 0,
 320                       PATHSPEC_PREFER_FULL,
 321                       prefix, argv);
 322
 323        if (pathspec->nr)
 324                ps_matched = xcalloc(pathspec->nr, 1);
 325
 326        if (read_cache() < 0)
 327                die(_("index file corrupt"));
 328
 329        for (i = 0; i < active_nr; i++) {
 330                const struct cache_entry *ce = active_cache[i];
 331
 332                if (!match_pathspec(pathspec, ce->name, ce_namelen(ce),
 333                                    0, ps_matched, 1) ||
 334                    !S_ISGITLINK(ce->ce_mode))
 335                        continue;
 336
 337                ALLOC_GROW(list->entries, list->nr + 1, list->alloc);
 338                list->entries[list->nr++] = ce;
 339                while (i + 1 < active_nr &&
 340                       !strcmp(ce->name, active_cache[i + 1]->name))
 341                        /*
 342                         * Skip entries with the same name in different stages
 343                         * to make sure an entry is returned only once.
 344                         */
 345                        i++;
 346        }
 347
 348        if (ps_matched && report_path_error(ps_matched, pathspec, prefix))
 349                result = -1;
 350
 351        free(ps_matched);
 352
 353        return result;
 354}
 355
 356static void module_list_active(struct module_list *list)
 357{
 358        int i;
 359        struct module_list active_modules = MODULE_LIST_INIT;
 360
 361        for (i = 0; i < list->nr; i++) {
 362                const struct cache_entry *ce = list->entries[i];
 363
 364                if (!is_submodule_active(the_repository, ce->name))
 365                        continue;
 366
 367                ALLOC_GROW(active_modules.entries,
 368                           active_modules.nr + 1,
 369                           active_modules.alloc);
 370                active_modules.entries[active_modules.nr++] = ce;
 371        }
 372
 373        free(list->entries);
 374        *list = active_modules;
 375}
 376
 377static char *get_up_path(const char *path)
 378{
 379        int i;
 380        struct strbuf sb = STRBUF_INIT;
 381
 382        for (i = count_slashes(path); i; i--)
 383                strbuf_addstr(&sb, "../");
 384
 385        /*
 386         * Check if 'path' ends with slash or not
 387         * for having the same output for dir/sub_dir
 388         * and dir/sub_dir/
 389         */
 390        if (!is_dir_sep(path[strlen(path) - 1]))
 391                strbuf_addstr(&sb, "../");
 392
 393        return strbuf_detach(&sb, NULL);
 394}
 395
 396static int module_list(int argc, const char **argv, const char *prefix)
 397{
 398        int i;
 399        struct pathspec pathspec;
 400        struct module_list list = MODULE_LIST_INIT;
 401
 402        struct option module_list_options[] = {
 403                OPT_STRING(0, "prefix", &prefix,
 404                           N_("path"),
 405                           N_("alternative anchor for relative paths")),
 406                OPT_END()
 407        };
 408
 409        const char *const git_submodule_helper_usage[] = {
 410                N_("git submodule--helper list [--prefix=<path>] [<path>...]"),
 411                NULL
 412        };
 413
 414        argc = parse_options(argc, argv, prefix, module_list_options,
 415                             git_submodule_helper_usage, 0);
 416
 417        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 418                return 1;
 419
 420        for (i = 0; i < list.nr; i++) {
 421                const struct cache_entry *ce = list.entries[i];
 422
 423                if (ce_stage(ce))
 424                        printf("%06o %s U\t", ce->ce_mode, sha1_to_hex(null_sha1));
 425                else
 426                        printf("%06o %s %d\t", ce->ce_mode,
 427                               oid_to_hex(&ce->oid), ce_stage(ce));
 428
 429                fprintf(stdout, "%s\n", ce->name);
 430        }
 431        return 0;
 432}
 433
 434static void for_each_listed_submodule(const struct module_list *list,
 435                                      each_submodule_fn fn, void *cb_data)
 436{
 437        int i;
 438        for (i = 0; i < list->nr; i++)
 439                fn(list->entries[i], cb_data);
 440}
 441
 442struct init_cb {
 443        const char *prefix;
 444        unsigned int flags;
 445};
 446
 447#define INIT_CB_INIT { NULL, 0 }
 448
 449static void init_submodule(const char *path, const char *prefix,
 450                           unsigned int flags)
 451{
 452        const struct submodule *sub;
 453        struct strbuf sb = STRBUF_INIT;
 454        char *upd = NULL, *url = NULL, *displaypath;
 455
 456        displaypath = get_submodule_displaypath(path, prefix);
 457
 458        sub = submodule_from_path(the_repository, &null_oid, path);
 459
 460        if (!sub)
 461                die(_("No url found for submodule path '%s' in .gitmodules"),
 462                        displaypath);
 463
 464        /*
 465         * NEEDSWORK: In a multi-working-tree world, this needs to be
 466         * set in the per-worktree config.
 467         *
 468         * Set active flag for the submodule being initialized
 469         */
 470        if (!is_submodule_active(the_repository, path)) {
 471                strbuf_addf(&sb, "submodule.%s.active", sub->name);
 472                git_config_set_gently(sb.buf, "true");
 473                strbuf_reset(&sb);
 474        }
 475
 476        /*
 477         * Copy url setting when it is not set yet.
 478         * To look up the url in .git/config, we must not fall back to
 479         * .gitmodules, so look it up directly.
 480         */
 481        strbuf_addf(&sb, "submodule.%s.url", sub->name);
 482        if (git_config_get_string(sb.buf, &url)) {
 483                if (!sub->url)
 484                        die(_("No url found for submodule path '%s' in .gitmodules"),
 485                                displaypath);
 486
 487                url = xstrdup(sub->url);
 488
 489                /* Possibly a url relative to parent */
 490                if (starts_with_dot_dot_slash(url) ||
 491                    starts_with_dot_slash(url)) {
 492                        char *remoteurl, *relurl;
 493                        char *remote = get_default_remote();
 494                        struct strbuf remotesb = STRBUF_INIT;
 495                        strbuf_addf(&remotesb, "remote.%s.url", remote);
 496                        free(remote);
 497
 498                        if (git_config_get_string(remotesb.buf, &remoteurl)) {
 499                                warning(_("could not lookup configuration '%s'. Assuming this repository is its own authoritative upstream."), remotesb.buf);
 500                                remoteurl = xgetcwd();
 501                        }
 502                        relurl = relative_url(remoteurl, url, NULL);
 503                        strbuf_release(&remotesb);
 504                        free(remoteurl);
 505                        free(url);
 506                        url = relurl;
 507                }
 508
 509                if (git_config_set_gently(sb.buf, url))
 510                        die(_("Failed to register url for submodule path '%s'"),
 511                            displaypath);
 512                if (!(flags & OPT_QUIET))
 513                        fprintf(stderr,
 514                                _("Submodule '%s' (%s) registered for path '%s'\n"),
 515                                sub->name, url, displaypath);
 516        }
 517        strbuf_reset(&sb);
 518
 519        /* Copy "update" setting when it is not set yet */
 520        strbuf_addf(&sb, "submodule.%s.update", sub->name);
 521        if (git_config_get_string(sb.buf, &upd) &&
 522            sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
 523                if (sub->update_strategy.type == SM_UPDATE_COMMAND) {
 524                        fprintf(stderr, _("warning: command update mode suggested for submodule '%s'\n"),
 525                                sub->name);
 526                        upd = xstrdup("none");
 527                } else
 528                        upd = xstrdup(submodule_strategy_to_string(&sub->update_strategy));
 529
 530                if (git_config_set_gently(sb.buf, upd))
 531                        die(_("Failed to register update mode for submodule path '%s'"), displaypath);
 532        }
 533        strbuf_release(&sb);
 534        free(displaypath);
 535        free(url);
 536        free(upd);
 537}
 538
 539static void init_submodule_cb(const struct cache_entry *list_item, void *cb_data)
 540{
 541        struct init_cb *info = cb_data;
 542        init_submodule(list_item->name, info->prefix, info->flags);
 543}
 544
 545static int module_init(int argc, const char **argv, const char *prefix)
 546{
 547        struct init_cb info = INIT_CB_INIT;
 548        struct pathspec pathspec;
 549        struct module_list list = MODULE_LIST_INIT;
 550        int quiet = 0;
 551
 552        struct option module_init_options[] = {
 553                OPT__QUIET(&quiet, N_("Suppress output for initializing a submodule")),
 554                OPT_END()
 555        };
 556
 557        const char *const git_submodule_helper_usage[] = {
 558                N_("git submodule--helper init [<path>]"),
 559                NULL
 560        };
 561
 562        argc = parse_options(argc, argv, prefix, module_init_options,
 563                             git_submodule_helper_usage, 0);
 564
 565        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 566                return 1;
 567
 568        /*
 569         * If there are no path args and submodule.active is set then,
 570         * by default, only initialize 'active' modules.
 571         */
 572        if (!argc && git_config_get_value_multi("submodule.active"))
 573                module_list_active(&list);
 574
 575        info.prefix = prefix;
 576        if (quiet)
 577                info.flags |= OPT_QUIET;
 578
 579        for_each_listed_submodule(&list, init_submodule_cb, &info);
 580
 581        return 0;
 582}
 583
 584struct status_cb {
 585        const char *prefix;
 586        unsigned int flags;
 587};
 588
 589#define STATUS_CB_INIT { NULL, 0 }
 590
 591static void print_status(unsigned int flags, char state, const char *path,
 592                         const struct object_id *oid, const char *displaypath)
 593{
 594        if (flags & OPT_QUIET)
 595                return;
 596
 597        printf("%c%s %s", state, oid_to_hex(oid), displaypath);
 598
 599        if (state == ' ' || state == '+')
 600                printf(" (%s)", compute_rev_name(path, oid_to_hex(oid)));
 601
 602        printf("\n");
 603}
 604
 605static int handle_submodule_head_ref(const char *refname,
 606                                     const struct object_id *oid, int flags,
 607                                     void *cb_data)
 608{
 609        struct object_id *output = cb_data;
 610        if (oid)
 611                oidcpy(output, oid);
 612
 613        return 0;
 614}
 615
 616static void status_submodule(const char *path, const struct object_id *ce_oid,
 617                             unsigned int ce_flags, const char *prefix,
 618                             unsigned int flags)
 619{
 620        char *displaypath;
 621        struct argv_array diff_files_args = ARGV_ARRAY_INIT;
 622        struct rev_info rev;
 623        int diff_files_result;
 624
 625        if (!submodule_from_path(the_repository, &null_oid, path))
 626                die(_("no submodule mapping found in .gitmodules for path '%s'"),
 627                      path);
 628
 629        displaypath = get_submodule_displaypath(path, prefix);
 630
 631        if ((CE_STAGEMASK & ce_flags) >> CE_STAGESHIFT) {
 632                print_status(flags, 'U', path, &null_oid, displaypath);
 633                goto cleanup;
 634        }
 635
 636        if (!is_submodule_active(the_repository, path)) {
 637                print_status(flags, '-', path, ce_oid, displaypath);
 638                goto cleanup;
 639        }
 640
 641        argv_array_pushl(&diff_files_args, "diff-files",
 642                         "--ignore-submodules=dirty", "--quiet", "--",
 643                         path, NULL);
 644
 645        git_config(git_diff_basic_config, NULL);
 646        init_revisions(&rev, prefix);
 647        rev.abbrev = 0;
 648        diff_files_args.argc = setup_revisions(diff_files_args.argc,
 649                                               diff_files_args.argv,
 650                                               &rev, NULL);
 651        diff_files_result = run_diff_files(&rev, 0);
 652
 653        if (!diff_result_code(&rev.diffopt, diff_files_result)) {
 654                print_status(flags, ' ', path, ce_oid,
 655                             displaypath);
 656        } else if (!(flags & OPT_CACHED)) {
 657                struct object_id oid;
 658
 659                if (refs_head_ref(get_submodule_ref_store(path),
 660                                  handle_submodule_head_ref, &oid))
 661                        die(_("could not resolve HEAD ref inside the "
 662                              "submodule '%s'"), path);
 663
 664                print_status(flags, '+', path, &oid, displaypath);
 665        } else {
 666                print_status(flags, '+', path, ce_oid, displaypath);
 667        }
 668
 669        if (flags & OPT_RECURSIVE) {
 670                struct child_process cpr = CHILD_PROCESS_INIT;
 671
 672                cpr.git_cmd = 1;
 673                cpr.dir = path;
 674                prepare_submodule_repo_env(&cpr.env_array);
 675
 676                argv_array_push(&cpr.args, "--super-prefix");
 677                argv_array_pushf(&cpr.args, "%s/", displaypath);
 678                argv_array_pushl(&cpr.args, "submodule--helper", "status",
 679                                 "--recursive", NULL);
 680
 681                if (flags & OPT_CACHED)
 682                        argv_array_push(&cpr.args, "--cached");
 683
 684                if (flags & OPT_QUIET)
 685                        argv_array_push(&cpr.args, "--quiet");
 686
 687                if (run_command(&cpr))
 688                        die(_("failed to recurse into submodule '%s'"), path);
 689        }
 690
 691cleanup:
 692        argv_array_clear(&diff_files_args);
 693        free(displaypath);
 694}
 695
 696static void status_submodule_cb(const struct cache_entry *list_item,
 697                                void *cb_data)
 698{
 699        struct status_cb *info = cb_data;
 700        status_submodule(list_item->name, &list_item->oid, list_item->ce_flags,
 701                         info->prefix, info->flags);
 702}
 703
 704static int module_status(int argc, const char **argv, const char *prefix)
 705{
 706        struct status_cb info = STATUS_CB_INIT;
 707        struct pathspec pathspec;
 708        struct module_list list = MODULE_LIST_INIT;
 709        int quiet = 0;
 710
 711        struct option module_status_options[] = {
 712                OPT__QUIET(&quiet, N_("Suppress submodule status output")),
 713                OPT_BIT(0, "cached", &info.flags, N_("Use commit stored in the index instead of the one stored in the submodule HEAD"), OPT_CACHED),
 714                OPT_BIT(0, "recursive", &info.flags, N_("recurse into nested submodules"), OPT_RECURSIVE),
 715                OPT_END()
 716        };
 717
 718        const char *const git_submodule_helper_usage[] = {
 719                N_("git submodule status [--quiet] [--cached] [--recursive] [<path>...]"),
 720                NULL
 721        };
 722
 723        argc = parse_options(argc, argv, prefix, module_status_options,
 724                             git_submodule_helper_usage, 0);
 725
 726        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 727                return 1;
 728
 729        info.prefix = prefix;
 730        if (quiet)
 731                info.flags |= OPT_QUIET;
 732
 733        for_each_listed_submodule(&list, status_submodule_cb, &info);
 734
 735        return 0;
 736}
 737
 738static int module_name(int argc, const char **argv, const char *prefix)
 739{
 740        const struct submodule *sub;
 741
 742        if (argc != 2)
 743                usage(_("git submodule--helper name <path>"));
 744
 745        sub = submodule_from_path(the_repository, &null_oid, argv[1]);
 746
 747        if (!sub)
 748                die(_("no submodule mapping found in .gitmodules for path '%s'"),
 749                    argv[1]);
 750
 751        printf("%s\n", sub->name);
 752
 753        return 0;
 754}
 755
 756struct sync_cb {
 757        const char *prefix;
 758        unsigned int flags;
 759};
 760
 761#define SYNC_CB_INIT { NULL, 0 }
 762
 763static void sync_submodule(const char *path, const char *prefix,
 764                           unsigned int flags)
 765{
 766        const struct submodule *sub;
 767        char *remote_key = NULL;
 768        char *sub_origin_url, *super_config_url, *displaypath;
 769        struct strbuf sb = STRBUF_INIT;
 770        struct child_process cp = CHILD_PROCESS_INIT;
 771        char *sub_config_path = NULL;
 772
 773        if (!is_submodule_active(the_repository, path))
 774                return;
 775
 776        sub = submodule_from_path(the_repository, &null_oid, path);
 777
 778        if (sub && sub->url) {
 779                if (starts_with_dot_dot_slash(sub->url) ||
 780                    starts_with_dot_slash(sub->url)) {
 781                        char *remote_url, *up_path;
 782                        char *remote = get_default_remote();
 783                        strbuf_addf(&sb, "remote.%s.url", remote);
 784
 785                        if (git_config_get_string(sb.buf, &remote_url))
 786                                remote_url = xgetcwd();
 787
 788                        up_path = get_up_path(path);
 789                        sub_origin_url = relative_url(remote_url, sub->url, up_path);
 790                        super_config_url = relative_url(remote_url, sub->url, NULL);
 791
 792                        free(remote);
 793                        free(up_path);
 794                        free(remote_url);
 795                } else {
 796                        sub_origin_url = xstrdup(sub->url);
 797                        super_config_url = xstrdup(sub->url);
 798                }
 799        } else {
 800                sub_origin_url = xstrdup("");
 801                super_config_url = xstrdup("");
 802        }
 803
 804        displaypath = get_submodule_displaypath(path, prefix);
 805
 806        if (!(flags & OPT_QUIET))
 807                printf(_("Synchronizing submodule url for '%s'\n"),
 808                         displaypath);
 809
 810        strbuf_reset(&sb);
 811        strbuf_addf(&sb, "submodule.%s.url", sub->name);
 812        if (git_config_set_gently(sb.buf, super_config_url))
 813                die(_("failed to register url for submodule path '%s'"),
 814                      displaypath);
 815
 816        if (!is_submodule_populated_gently(path, NULL))
 817                goto cleanup;
 818
 819        prepare_submodule_repo_env(&cp.env_array);
 820        cp.git_cmd = 1;
 821        cp.dir = path;
 822        argv_array_pushl(&cp.args, "submodule--helper",
 823                         "print-default-remote", NULL);
 824
 825        strbuf_reset(&sb);
 826        if (capture_command(&cp, &sb, 0))
 827                die(_("failed to get the default remote for submodule '%s'"),
 828                      path);
 829
 830        strbuf_strip_suffix(&sb, "\n");
 831        remote_key = xstrfmt("remote.%s.url", sb.buf);
 832
 833        strbuf_reset(&sb);
 834        submodule_to_gitdir(&sb, path);
 835        strbuf_addstr(&sb, "/config");
 836
 837        if (git_config_set_in_file_gently(sb.buf, remote_key, sub_origin_url))
 838                die(_("failed to update remote for submodule '%s'"),
 839                      path);
 840
 841        if (flags & OPT_RECURSIVE) {
 842                struct child_process cpr = CHILD_PROCESS_INIT;
 843
 844                cpr.git_cmd = 1;
 845                cpr.dir = path;
 846                prepare_submodule_repo_env(&cpr.env_array);
 847
 848                argv_array_push(&cpr.args, "--super-prefix");
 849                argv_array_pushf(&cpr.args, "%s/", displaypath);
 850                argv_array_pushl(&cpr.args, "submodule--helper", "sync",
 851                                 "--recursive", NULL);
 852
 853                if (flags & OPT_QUIET)
 854                        argv_array_push(&cpr.args, "--quiet");
 855
 856                if (run_command(&cpr))
 857                        die(_("failed to recurse into submodule '%s'"),
 858                              path);
 859        }
 860
 861cleanup:
 862        free(super_config_url);
 863        free(sub_origin_url);
 864        strbuf_release(&sb);
 865        free(remote_key);
 866        free(displaypath);
 867        free(sub_config_path);
 868}
 869
 870static void sync_submodule_cb(const struct cache_entry *list_item, void *cb_data)
 871{
 872        struct sync_cb *info = cb_data;
 873        sync_submodule(list_item->name, info->prefix, info->flags);
 874
 875}
 876
 877static int module_sync(int argc, const char **argv, const char *prefix)
 878{
 879        struct sync_cb info = SYNC_CB_INIT;
 880        struct pathspec pathspec;
 881        struct module_list list = MODULE_LIST_INIT;
 882        int quiet = 0;
 883        int recursive = 0;
 884
 885        struct option module_sync_options[] = {
 886                OPT__QUIET(&quiet, N_("Suppress output of synchronizing submodule url")),
 887                OPT_BOOL(0, "recursive", &recursive,
 888                        N_("Recurse into nested submodules")),
 889                OPT_END()
 890        };
 891
 892        const char *const git_submodule_helper_usage[] = {
 893                N_("git submodule--helper sync [--quiet] [--recursive] [<path>]"),
 894                NULL
 895        };
 896
 897        argc = parse_options(argc, argv, prefix, module_sync_options,
 898                             git_submodule_helper_usage, 0);
 899
 900        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 901                return 1;
 902
 903        info.prefix = prefix;
 904        if (quiet)
 905                info.flags |= OPT_QUIET;
 906        if (recursive)
 907                info.flags |= OPT_RECURSIVE;
 908
 909        for_each_listed_submodule(&list, sync_submodule_cb, &info);
 910
 911        return 0;
 912}
 913
 914struct deinit_cb {
 915        const char *prefix;
 916        unsigned int flags;
 917};
 918#define DEINIT_CB_INIT { NULL, 0 }
 919
 920static void deinit_submodule(const char *path, const char *prefix,
 921                             unsigned int flags)
 922{
 923        const struct submodule *sub;
 924        char *displaypath = NULL;
 925        struct child_process cp_config = CHILD_PROCESS_INIT;
 926        struct strbuf sb_config = STRBUF_INIT;
 927        char *sub_git_dir = xstrfmt("%s/.git", path);
 928
 929        sub = submodule_from_path(the_repository, &null_oid, path);
 930
 931        if (!sub || !sub->name)
 932                goto cleanup;
 933
 934        displaypath = get_submodule_displaypath(path, prefix);
 935
 936        /* remove the submodule work tree (unless the user already did it) */
 937        if (is_directory(path)) {
 938                struct strbuf sb_rm = STRBUF_INIT;
 939                const char *format;
 940
 941                /*
 942                 * protect submodules containing a .git directory
 943                 * NEEDSWORK: instead of dying, automatically call
 944                 * absorbgitdirs and (possibly) warn.
 945                 */
 946                if (is_directory(sub_git_dir))
 947                        die(_("Submodule work tree '%s' contains a .git "
 948                              "directory (use 'rm -rf' if you really want "
 949                              "to remove it including all of its history)"),
 950                            displaypath);
 951
 952                if (!(flags & OPT_FORCE)) {
 953                        struct child_process cp_rm = CHILD_PROCESS_INIT;
 954                        cp_rm.git_cmd = 1;
 955                        argv_array_pushl(&cp_rm.args, "rm", "-qn",
 956                                         path, NULL);
 957
 958                        if (run_command(&cp_rm))
 959                                die(_("Submodule work tree '%s' contains local "
 960                                      "modifications; use '-f' to discard them"),
 961                                      displaypath);
 962                }
 963
 964                strbuf_addstr(&sb_rm, path);
 965
 966                if (!remove_dir_recursively(&sb_rm, 0))
 967                        format = _("Cleared directory '%s'\n");
 968                else
 969                        format = _("Could not remove submodule work tree '%s'\n");
 970
 971                if (!(flags & OPT_QUIET))
 972                        printf(format, displaypath);
 973
 974                strbuf_release(&sb_rm);
 975        }
 976
 977        if (mkdir(path, 0777))
 978                printf(_("could not create empty submodule directory %s"),
 979                      displaypath);
 980
 981        cp_config.git_cmd = 1;
 982        argv_array_pushl(&cp_config.args, "config", "--get-regexp", NULL);
 983        argv_array_pushf(&cp_config.args, "submodule.%s\\.", sub->name);
 984
 985        /* remove the .git/config entries (unless the user already did it) */
 986        if (!capture_command(&cp_config, &sb_config, 0) && sb_config.len) {
 987                char *sub_key = xstrfmt("submodule.%s", sub->name);
 988                /*
 989                 * remove the whole section so we have a clean state when
 990                 * the user later decides to init this submodule again
 991                 */
 992                git_config_rename_section_in_file(NULL, sub_key, NULL);
 993                if (!(flags & OPT_QUIET))
 994                        printf(_("Submodule '%s' (%s) unregistered for path '%s'\n"),
 995                                 sub->name, sub->url, displaypath);
 996                free(sub_key);
 997        }
 998
 999cleanup:
1000        free(displaypath);
1001        free(sub_git_dir);
1002        strbuf_release(&sb_config);
1003}
1004
1005static void deinit_submodule_cb(const struct cache_entry *list_item,
1006                                void *cb_data)
1007{
1008        struct deinit_cb *info = cb_data;
1009        deinit_submodule(list_item->name, info->prefix, info->flags);
1010}
1011
1012static int module_deinit(int argc, const char **argv, const char *prefix)
1013{
1014        struct deinit_cb info = DEINIT_CB_INIT;
1015        struct pathspec pathspec;
1016        struct module_list list = MODULE_LIST_INIT;
1017        int quiet = 0;
1018        int force = 0;
1019        int all = 0;
1020
1021        struct option module_deinit_options[] = {
1022                OPT__QUIET(&quiet, N_("Suppress submodule status output")),
1023                OPT__FORCE(&force, N_("Remove submodule working trees even if they contain local changes")),
1024                OPT_BOOL(0, "all", &all, N_("Unregister all submodules")),
1025                OPT_END()
1026        };
1027
1028        const char *const git_submodule_helper_usage[] = {
1029                N_("git submodule deinit [--quiet] [-f | --force] [--all | [--] [<path>...]]"),
1030                NULL
1031        };
1032
1033        argc = parse_options(argc, argv, prefix, module_deinit_options,
1034                             git_submodule_helper_usage, 0);
1035
1036        if (all && argc) {
1037                error("pathspec and --all are incompatible");
1038                usage_with_options(git_submodule_helper_usage,
1039                                   module_deinit_options);
1040        }
1041
1042        if (!argc && !all)
1043                die(_("Use '--all' if you really want to deinitialize all submodules"));
1044
1045        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1046                BUG("module_list_compute should not choke on empty pathspec");
1047
1048        info.prefix = prefix;
1049        if (quiet)
1050                info.flags |= OPT_QUIET;
1051        if (force)
1052                info.flags |= OPT_FORCE;
1053
1054        for_each_listed_submodule(&list, deinit_submodule_cb, &info);
1055
1056        return 0;
1057}
1058
1059static int clone_submodule(const char *path, const char *gitdir, const char *url,
1060                           const char *depth, struct string_list *reference,
1061                           int quiet, int progress)
1062{
1063        struct child_process cp = CHILD_PROCESS_INIT;
1064
1065        argv_array_push(&cp.args, "clone");
1066        argv_array_push(&cp.args, "--no-checkout");
1067        if (quiet)
1068                argv_array_push(&cp.args, "--quiet");
1069        if (progress)
1070                argv_array_push(&cp.args, "--progress");
1071        if (depth && *depth)
1072                argv_array_pushl(&cp.args, "--depth", depth, NULL);
1073        if (reference->nr) {
1074                struct string_list_item *item;
1075                for_each_string_list_item(item, reference)
1076                        argv_array_pushl(&cp.args, "--reference",
1077                                         item->string, NULL);
1078        }
1079        if (gitdir && *gitdir)
1080                argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
1081
1082        argv_array_push(&cp.args, url);
1083        argv_array_push(&cp.args, path);
1084
1085        cp.git_cmd = 1;
1086        prepare_submodule_repo_env(&cp.env_array);
1087        cp.no_stdin = 1;
1088
1089        return run_command(&cp);
1090}
1091
1092struct submodule_alternate_setup {
1093        const char *submodule_name;
1094        enum SUBMODULE_ALTERNATE_ERROR_MODE {
1095                SUBMODULE_ALTERNATE_ERROR_DIE,
1096                SUBMODULE_ALTERNATE_ERROR_INFO,
1097                SUBMODULE_ALTERNATE_ERROR_IGNORE
1098        } error_mode;
1099        struct string_list *reference;
1100};
1101#define SUBMODULE_ALTERNATE_SETUP_INIT { NULL, \
1102        SUBMODULE_ALTERNATE_ERROR_IGNORE, NULL }
1103
1104static int add_possible_reference_from_superproject(
1105                struct alternate_object_database *alt, void *sas_cb)
1106{
1107        struct submodule_alternate_setup *sas = sas_cb;
1108
1109        /*
1110         * If the alternate object store is another repository, try the
1111         * standard layout with .git/(modules/<name>)+/objects
1112         */
1113        if (ends_with(alt->path, "/objects")) {
1114                char *sm_alternate;
1115                struct strbuf sb = STRBUF_INIT;
1116                struct strbuf err = STRBUF_INIT;
1117                strbuf_add(&sb, alt->path, strlen(alt->path) - strlen("objects"));
1118
1119                /*
1120                 * We need to end the new path with '/' to mark it as a dir,
1121                 * otherwise a submodule name containing '/' will be broken
1122                 * as the last part of a missing submodule reference would
1123                 * be taken as a file name.
1124                 */
1125                strbuf_addf(&sb, "modules/%s/", sas->submodule_name);
1126
1127                sm_alternate = compute_alternate_path(sb.buf, &err);
1128                if (sm_alternate) {
1129                        string_list_append(sas->reference, xstrdup(sb.buf));
1130                        free(sm_alternate);
1131                } else {
1132                        switch (sas->error_mode) {
1133                        case SUBMODULE_ALTERNATE_ERROR_DIE:
1134                                die(_("submodule '%s' cannot add alternate: %s"),
1135                                    sas->submodule_name, err.buf);
1136                        case SUBMODULE_ALTERNATE_ERROR_INFO:
1137                                fprintf(stderr, _("submodule '%s' cannot add alternate: %s"),
1138                                        sas->submodule_name, err.buf);
1139                        case SUBMODULE_ALTERNATE_ERROR_IGNORE:
1140                                ; /* nothing */
1141                        }
1142                }
1143                strbuf_release(&sb);
1144        }
1145
1146        return 0;
1147}
1148
1149static void prepare_possible_alternates(const char *sm_name,
1150                struct string_list *reference)
1151{
1152        char *sm_alternate = NULL, *error_strategy = NULL;
1153        struct submodule_alternate_setup sas = SUBMODULE_ALTERNATE_SETUP_INIT;
1154
1155        git_config_get_string("submodule.alternateLocation", &sm_alternate);
1156        if (!sm_alternate)
1157                return;
1158
1159        git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
1160
1161        if (!error_strategy)
1162                error_strategy = xstrdup("die");
1163
1164        sas.submodule_name = sm_name;
1165        sas.reference = reference;
1166        if (!strcmp(error_strategy, "die"))
1167                sas.error_mode = SUBMODULE_ALTERNATE_ERROR_DIE;
1168        else if (!strcmp(error_strategy, "info"))
1169                sas.error_mode = SUBMODULE_ALTERNATE_ERROR_INFO;
1170        else if (!strcmp(error_strategy, "ignore"))
1171                sas.error_mode = SUBMODULE_ALTERNATE_ERROR_IGNORE;
1172        else
1173                die(_("Value '%s' for submodule.alternateErrorStrategy is not recognized"), error_strategy);
1174
1175        if (!strcmp(sm_alternate, "superproject"))
1176                foreach_alt_odb(add_possible_reference_from_superproject, &sas);
1177        else if (!strcmp(sm_alternate, "no"))
1178                ; /* do nothing */
1179        else
1180                die(_("Value '%s' for submodule.alternateLocation is not recognized"), sm_alternate);
1181
1182        free(sm_alternate);
1183        free(error_strategy);
1184}
1185
1186static int module_clone(int argc, const char **argv, const char *prefix)
1187{
1188        const char *name = NULL, *url = NULL, *depth = NULL;
1189        int quiet = 0;
1190        int progress = 0;
1191        char *p, *path = NULL, *sm_gitdir;
1192        struct strbuf sb = STRBUF_INIT;
1193        struct string_list reference = STRING_LIST_INIT_NODUP;
1194        char *sm_alternate = NULL, *error_strategy = NULL;
1195
1196        struct option module_clone_options[] = {
1197                OPT_STRING(0, "prefix", &prefix,
1198                           N_("path"),
1199                           N_("alternative anchor for relative paths")),
1200                OPT_STRING(0, "path", &path,
1201                           N_("path"),
1202                           N_("where the new submodule will be cloned to")),
1203                OPT_STRING(0, "name", &name,
1204                           N_("string"),
1205                           N_("name of the new submodule")),
1206                OPT_STRING(0, "url", &url,
1207                           N_("string"),
1208                           N_("url where to clone the submodule from")),
1209                OPT_STRING_LIST(0, "reference", &reference,
1210                           N_("repo"),
1211                           N_("reference repository")),
1212                OPT_STRING(0, "depth", &depth,
1213                           N_("string"),
1214                           N_("depth for shallow clones")),
1215                OPT__QUIET(&quiet, "Suppress output for cloning a submodule"),
1216                OPT_BOOL(0, "progress", &progress,
1217                           N_("force cloning progress")),
1218                OPT_END()
1219        };
1220
1221        const char *const git_submodule_helper_usage[] = {
1222                N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
1223                   "[--reference <repository>] [--name <name>] [--depth <depth>] "
1224                   "--url <url> --path <path>"),
1225                NULL
1226        };
1227
1228        argc = parse_options(argc, argv, prefix, module_clone_options,
1229                             git_submodule_helper_usage, 0);
1230
1231        if (argc || !url || !path || !*path)
1232                usage_with_options(git_submodule_helper_usage,
1233                                   module_clone_options);
1234
1235        strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
1236        sm_gitdir = absolute_pathdup(sb.buf);
1237        strbuf_reset(&sb);
1238
1239        if (!is_absolute_path(path)) {
1240                strbuf_addf(&sb, "%s/%s", get_git_work_tree(), path);
1241                path = strbuf_detach(&sb, NULL);
1242        } else
1243                path = xstrdup(path);
1244
1245        if (!file_exists(sm_gitdir)) {
1246                if (safe_create_leading_directories_const(sm_gitdir) < 0)
1247                        die(_("could not create directory '%s'"), sm_gitdir);
1248
1249                prepare_possible_alternates(name, &reference);
1250
1251                if (clone_submodule(path, sm_gitdir, url, depth, &reference,
1252                                    quiet, progress))
1253                        die(_("clone of '%s' into submodule path '%s' failed"),
1254                            url, path);
1255        } else {
1256                if (safe_create_leading_directories_const(path) < 0)
1257                        die(_("could not create directory '%s'"), path);
1258                strbuf_addf(&sb, "%s/index", sm_gitdir);
1259                unlink_or_warn(sb.buf);
1260                strbuf_reset(&sb);
1261        }
1262
1263        connect_work_tree_and_git_dir(path, sm_gitdir, 0);
1264
1265        p = git_pathdup_submodule(path, "config");
1266        if (!p)
1267                die(_("could not get submodule directory for '%s'"), path);
1268
1269        /* setup alternateLocation and alternateErrorStrategy in the cloned submodule if needed */
1270        git_config_get_string("submodule.alternateLocation", &sm_alternate);
1271        if (sm_alternate)
1272                git_config_set_in_file(p, "submodule.alternateLocation",
1273                                           sm_alternate);
1274        git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
1275        if (error_strategy)
1276                git_config_set_in_file(p, "submodule.alternateErrorStrategy",
1277                                           error_strategy);
1278
1279        free(sm_alternate);
1280        free(error_strategy);
1281
1282        strbuf_release(&sb);
1283        free(sm_gitdir);
1284        free(path);
1285        free(p);
1286        return 0;
1287}
1288
1289struct submodule_update_clone {
1290        /* index into 'list', the list of submodules to look into for cloning */
1291        int current;
1292        struct module_list list;
1293        unsigned warn_if_uninitialized : 1;
1294
1295        /* update parameter passed via commandline */
1296        struct submodule_update_strategy update;
1297
1298        /* configuration parameters which are passed on to the children */
1299        int progress;
1300        int quiet;
1301        int recommend_shallow;
1302        struct string_list references;
1303        const char *depth;
1304        const char *recursive_prefix;
1305        const char *prefix;
1306
1307        /* Machine-readable status lines to be consumed by git-submodule.sh */
1308        struct string_list projectlines;
1309
1310        /* If we want to stop as fast as possible and return an error */
1311        unsigned quickstop : 1;
1312
1313        /* failed clones to be retried again */
1314        const struct cache_entry **failed_clones;
1315        int failed_clones_nr, failed_clones_alloc;
1316};
1317#define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
1318        SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, \
1319        NULL, NULL, NULL, \
1320        STRING_LIST_INIT_DUP, 0, NULL, 0, 0}
1321
1322
1323static void next_submodule_warn_missing(struct submodule_update_clone *suc,
1324                struct strbuf *out, const char *displaypath)
1325{
1326        /*
1327         * Only mention uninitialized submodules when their
1328         * paths have been specified.
1329         */
1330        if (suc->warn_if_uninitialized) {
1331                strbuf_addf(out,
1332                        _("Submodule path '%s' not initialized"),
1333                        displaypath);
1334                strbuf_addch(out, '\n');
1335                strbuf_addstr(out,
1336                        _("Maybe you want to use 'update --init'?"));
1337                strbuf_addch(out, '\n');
1338        }
1339}
1340
1341/**
1342 * Determine whether 'ce' needs to be cloned. If so, prepare the 'child' to
1343 * run the clone. Returns 1 if 'ce' needs to be cloned, 0 otherwise.
1344 */
1345static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
1346                                           struct child_process *child,
1347                                           struct submodule_update_clone *suc,
1348                                           struct strbuf *out)
1349{
1350        const struct submodule *sub = NULL;
1351        const char *url = NULL;
1352        const char *update_string;
1353        enum submodule_update_type update_type;
1354        char *key;
1355        struct strbuf displaypath_sb = STRBUF_INIT;
1356        struct strbuf sb = STRBUF_INIT;
1357        const char *displaypath = NULL;
1358        int needs_cloning = 0;
1359
1360        if (ce_stage(ce)) {
1361                if (suc->recursive_prefix)
1362                        strbuf_addf(&sb, "%s/%s", suc->recursive_prefix, ce->name);
1363                else
1364                        strbuf_addstr(&sb, ce->name);
1365                strbuf_addf(out, _("Skipping unmerged submodule %s"), sb.buf);
1366                strbuf_addch(out, '\n');
1367                goto cleanup;
1368        }
1369
1370        sub = submodule_from_path(the_repository, &null_oid, ce->name);
1371
1372        if (suc->recursive_prefix)
1373                displaypath = relative_path(suc->recursive_prefix,
1374                                            ce->name, &displaypath_sb);
1375        else
1376                displaypath = ce->name;
1377
1378        if (!sub) {
1379                next_submodule_warn_missing(suc, out, displaypath);
1380                goto cleanup;
1381        }
1382
1383        key = xstrfmt("submodule.%s.update", sub->name);
1384        if (!repo_config_get_string_const(the_repository, key, &update_string)) {
1385                update_type = parse_submodule_update_type(update_string);
1386        } else {
1387                update_type = sub->update_strategy.type;
1388        }
1389        free(key);
1390
1391        if (suc->update.type == SM_UPDATE_NONE
1392            || (suc->update.type == SM_UPDATE_UNSPECIFIED
1393                && update_type == SM_UPDATE_NONE)) {
1394                strbuf_addf(out, _("Skipping submodule '%s'"), displaypath);
1395                strbuf_addch(out, '\n');
1396                goto cleanup;
1397        }
1398
1399        /* Check if the submodule has been initialized. */
1400        if (!is_submodule_active(the_repository, ce->name)) {
1401                next_submodule_warn_missing(suc, out, displaypath);
1402                goto cleanup;
1403        }
1404
1405        strbuf_reset(&sb);
1406        strbuf_addf(&sb, "submodule.%s.url", sub->name);
1407        if (repo_config_get_string_const(the_repository, sb.buf, &url))
1408                url = sub->url;
1409
1410        strbuf_reset(&sb);
1411        strbuf_addf(&sb, "%s/.git", ce->name);
1412        needs_cloning = !file_exists(sb.buf);
1413
1414        strbuf_reset(&sb);
1415        strbuf_addf(&sb, "%06o %s %d %d\t%s\n", ce->ce_mode,
1416                        oid_to_hex(&ce->oid), ce_stage(ce),
1417                        needs_cloning, ce->name);
1418        string_list_append(&suc->projectlines, sb.buf);
1419
1420        if (!needs_cloning)
1421                goto cleanup;
1422
1423        child->git_cmd = 1;
1424        child->no_stdin = 1;
1425        child->stdout_to_stderr = 1;
1426        child->err = -1;
1427        argv_array_push(&child->args, "submodule--helper");
1428        argv_array_push(&child->args, "clone");
1429        if (suc->progress)
1430                argv_array_push(&child->args, "--progress");
1431        if (suc->quiet)
1432                argv_array_push(&child->args, "--quiet");
1433        if (suc->prefix)
1434                argv_array_pushl(&child->args, "--prefix", suc->prefix, NULL);
1435        if (suc->recommend_shallow && sub->recommend_shallow == 1)
1436                argv_array_push(&child->args, "--depth=1");
1437        argv_array_pushl(&child->args, "--path", sub->path, NULL);
1438        argv_array_pushl(&child->args, "--name", sub->name, NULL);
1439        argv_array_pushl(&child->args, "--url", url, NULL);
1440        if (suc->references.nr) {
1441                struct string_list_item *item;
1442                for_each_string_list_item(item, &suc->references)
1443                        argv_array_pushl(&child->args, "--reference", item->string, NULL);
1444        }
1445        if (suc->depth)
1446                argv_array_push(&child->args, suc->depth);
1447
1448cleanup:
1449        strbuf_reset(&displaypath_sb);
1450        strbuf_reset(&sb);
1451
1452        return needs_cloning;
1453}
1454
1455static int update_clone_get_next_task(struct child_process *child,
1456                                      struct strbuf *err,
1457                                      void *suc_cb,
1458                                      void **idx_task_cb)
1459{
1460        struct submodule_update_clone *suc = suc_cb;
1461        const struct cache_entry *ce;
1462        int index;
1463
1464        for (; suc->current < suc->list.nr; suc->current++) {
1465                ce = suc->list.entries[suc->current];
1466                if (prepare_to_clone_next_submodule(ce, child, suc, err)) {
1467                        int *p = xmalloc(sizeof(*p));
1468                        *p = suc->current;
1469                        *idx_task_cb = p;
1470                        suc->current++;
1471                        return 1;
1472                }
1473        }
1474
1475        /*
1476         * The loop above tried cloning each submodule once, now try the
1477         * stragglers again, which we can imagine as an extension of the
1478         * entry list.
1479         */
1480        index = suc->current - suc->list.nr;
1481        if (index < suc->failed_clones_nr) {
1482                int *p;
1483                ce = suc->failed_clones[index];
1484                if (!prepare_to_clone_next_submodule(ce, child, suc, err)) {
1485                        suc->current ++;
1486                        strbuf_addstr(err, "BUG: submodule considered for "
1487                                           "cloning, doesn't need cloning "
1488                                           "any more?\n");
1489                        return 0;
1490                }
1491                p = xmalloc(sizeof(*p));
1492                *p = suc->current;
1493                *idx_task_cb = p;
1494                suc->current ++;
1495                return 1;
1496        }
1497
1498        return 0;
1499}
1500
1501static int update_clone_start_failure(struct strbuf *err,
1502                                      void *suc_cb,
1503                                      void *idx_task_cb)
1504{
1505        struct submodule_update_clone *suc = suc_cb;
1506        suc->quickstop = 1;
1507        return 1;
1508}
1509
1510static int update_clone_task_finished(int result,
1511                                      struct strbuf *err,
1512                                      void *suc_cb,
1513                                      void *idx_task_cb)
1514{
1515        const struct cache_entry *ce;
1516        struct submodule_update_clone *suc = suc_cb;
1517
1518        int *idxP = idx_task_cb;
1519        int idx = *idxP;
1520        free(idxP);
1521
1522        if (!result)
1523                return 0;
1524
1525        if (idx < suc->list.nr) {
1526                ce  = suc->list.entries[idx];
1527                strbuf_addf(err, _("Failed to clone '%s'. Retry scheduled"),
1528                            ce->name);
1529                strbuf_addch(err, '\n');
1530                ALLOC_GROW(suc->failed_clones,
1531                           suc->failed_clones_nr + 1,
1532                           suc->failed_clones_alloc);
1533                suc->failed_clones[suc->failed_clones_nr++] = ce;
1534                return 0;
1535        } else {
1536                idx -= suc->list.nr;
1537                ce  = suc->failed_clones[idx];
1538                strbuf_addf(err, _("Failed to clone '%s' a second time, aborting"),
1539                            ce->name);
1540                strbuf_addch(err, '\n');
1541                suc->quickstop = 1;
1542                return 1;
1543        }
1544
1545        return 0;
1546}
1547
1548static int gitmodules_update_clone_config(const char *var, const char *value,
1549                                          void *cb)
1550{
1551        int *max_jobs = cb;
1552        if (!strcmp(var, "submodule.fetchjobs"))
1553                *max_jobs = parse_submodule_fetchjobs(var, value);
1554        return 0;
1555}
1556
1557static int update_clone(int argc, const char **argv, const char *prefix)
1558{
1559        const char *update = NULL;
1560        int max_jobs = 1;
1561        struct string_list_item *item;
1562        struct pathspec pathspec;
1563        struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
1564
1565        struct option module_update_clone_options[] = {
1566                OPT_STRING(0, "prefix", &prefix,
1567                           N_("path"),
1568                           N_("path into the working tree")),
1569                OPT_STRING(0, "recursive-prefix", &suc.recursive_prefix,
1570                           N_("path"),
1571                           N_("path into the working tree, across nested "
1572                              "submodule boundaries")),
1573                OPT_STRING(0, "update", &update,
1574                           N_("string"),
1575                           N_("rebase, merge, checkout or none")),
1576                OPT_STRING_LIST(0, "reference", &suc.references, N_("repo"),
1577                           N_("reference repository")),
1578                OPT_STRING(0, "depth", &suc.depth, "<depth>",
1579                           N_("Create a shallow clone truncated to the "
1580                              "specified number of revisions")),
1581                OPT_INTEGER('j', "jobs", &max_jobs,
1582                            N_("parallel jobs")),
1583                OPT_BOOL(0, "recommend-shallow", &suc.recommend_shallow,
1584                            N_("whether the initial clone should follow the shallow recommendation")),
1585                OPT__QUIET(&suc.quiet, N_("don't print cloning progress")),
1586                OPT_BOOL(0, "progress", &suc.progress,
1587                            N_("force cloning progress")),
1588                OPT_END()
1589        };
1590
1591        const char *const git_submodule_helper_usage[] = {
1592                N_("git submodule--helper update_clone [--prefix=<path>] [<path>...]"),
1593                NULL
1594        };
1595        suc.prefix = prefix;
1596
1597        config_from_gitmodules(gitmodules_update_clone_config, &max_jobs);
1598        git_config(gitmodules_update_clone_config, &max_jobs);
1599
1600        argc = parse_options(argc, argv, prefix, module_update_clone_options,
1601                             git_submodule_helper_usage, 0);
1602
1603        if (update)
1604                if (parse_submodule_update_strategy(update, &suc.update) < 0)
1605                        die(_("bad value for update parameter"));
1606
1607        if (module_list_compute(argc, argv, prefix, &pathspec, &suc.list) < 0)
1608                return 1;
1609
1610        if (pathspec.nr)
1611                suc.warn_if_uninitialized = 1;
1612
1613        run_processes_parallel(max_jobs,
1614                               update_clone_get_next_task,
1615                               update_clone_start_failure,
1616                               update_clone_task_finished,
1617                               &suc);
1618
1619        /*
1620         * We saved the output and put it out all at once now.
1621         * That means:
1622         * - the listener does not have to interleave their (checkout)
1623         *   work with our fetching.  The writes involved in a
1624         *   checkout involve more straightforward sequential I/O.
1625         * - the listener can avoid doing any work if fetching failed.
1626         */
1627        if (suc.quickstop)
1628                return 1;
1629
1630        for_each_string_list_item(item, &suc.projectlines)
1631                fprintf(stdout, "%s", item->string);
1632
1633        return 0;
1634}
1635
1636static int resolve_relative_path(int argc, const char **argv, const char *prefix)
1637{
1638        struct strbuf sb = STRBUF_INIT;
1639        if (argc != 3)
1640                die("submodule--helper relative-path takes exactly 2 arguments, got %d", argc);
1641
1642        printf("%s", relative_path(argv[1], argv[2], &sb));
1643        strbuf_release(&sb);
1644        return 0;
1645}
1646
1647static const char *remote_submodule_branch(const char *path)
1648{
1649        const struct submodule *sub;
1650        const char *branch = NULL;
1651        char *key;
1652
1653        sub = submodule_from_path(the_repository, &null_oid, path);
1654        if (!sub)
1655                return NULL;
1656
1657        key = xstrfmt("submodule.%s.branch", sub->name);
1658        if (repo_config_get_string_const(the_repository, key, &branch))
1659                branch = sub->branch;
1660        free(key);
1661
1662        if (!branch)
1663                return "master";
1664
1665        if (!strcmp(branch, ".")) {
1666                const char *refname = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
1667
1668                if (!refname)
1669                        die(_("No such ref: %s"), "HEAD");
1670
1671                /* detached HEAD */
1672                if (!strcmp(refname, "HEAD"))
1673                        die(_("Submodule (%s) branch configured to inherit "
1674                              "branch from superproject, but the superproject "
1675                              "is not on any branch"), sub->name);
1676
1677                if (!skip_prefix(refname, "refs/heads/", &refname))
1678                        die(_("Expecting a full ref name, got %s"), refname);
1679                return refname;
1680        }
1681
1682        return branch;
1683}
1684
1685static int resolve_remote_submodule_branch(int argc, const char **argv,
1686                const char *prefix)
1687{
1688        const char *ret;
1689        struct strbuf sb = STRBUF_INIT;
1690        if (argc != 2)
1691                die("submodule--helper remote-branch takes exactly one arguments, got %d", argc);
1692
1693        ret = remote_submodule_branch(argv[1]);
1694        if (!ret)
1695                die("submodule %s doesn't exist", argv[1]);
1696
1697        printf("%s", ret);
1698        strbuf_release(&sb);
1699        return 0;
1700}
1701
1702static int push_check(int argc, const char **argv, const char *prefix)
1703{
1704        struct remote *remote;
1705        const char *superproject_head;
1706        char *head;
1707        int detached_head = 0;
1708        struct object_id head_oid;
1709
1710        if (argc < 3)
1711                die("submodule--helper push-check requires at least 2 arguments");
1712
1713        /*
1714         * superproject's resolved head ref.
1715         * if HEAD then the superproject is in a detached head state, otherwise
1716         * it will be the resolved head ref.
1717         */
1718        superproject_head = argv[1];
1719        argv++;
1720        argc--;
1721        /* Get the submodule's head ref and determine if it is detached */
1722        head = resolve_refdup("HEAD", 0, &head_oid, NULL);
1723        if (!head)
1724                die(_("Failed to resolve HEAD as a valid ref."));
1725        if (!strcmp(head, "HEAD"))
1726                detached_head = 1;
1727
1728        /*
1729         * The remote must be configured.
1730         * This is to avoid pushing to the exact same URL as the parent.
1731         */
1732        remote = pushremote_get(argv[1]);
1733        if (!remote || remote->origin == REMOTE_UNCONFIGURED)
1734                die("remote '%s' not configured", argv[1]);
1735
1736        /* Check the refspec */
1737        if (argc > 2) {
1738                int i, refspec_nr = argc - 2;
1739                struct ref *local_refs = get_local_heads();
1740                struct refspec *refspec = parse_push_refspec(refspec_nr,
1741                                                             argv + 2);
1742
1743                for (i = 0; i < refspec_nr; i++) {
1744                        struct refspec *rs = refspec + i;
1745
1746                        if (rs->pattern || rs->matching)
1747                                continue;
1748
1749                        /* LHS must match a single ref */
1750                        switch (count_refspec_match(rs->src, local_refs, NULL)) {
1751                        case 1:
1752                                break;
1753                        case 0:
1754                                /*
1755                                 * If LHS matches 'HEAD' then we need to ensure
1756                                 * that it matches the same named branch
1757                                 * checked out in the superproject.
1758                                 */
1759                                if (!strcmp(rs->src, "HEAD")) {
1760                                        if (!detached_head &&
1761                                            !strcmp(head, superproject_head))
1762                                                break;
1763                                        die("HEAD does not match the named branch in the superproject");
1764                                }
1765                                /* fallthrough */
1766                        default:
1767                                die("src refspec '%s' must name a ref",
1768                                    rs->src);
1769                        }
1770                }
1771                free_refspec(refspec_nr, refspec);
1772        }
1773        free(head);
1774
1775        return 0;
1776}
1777
1778static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
1779{
1780        int i;
1781        struct pathspec pathspec;
1782        struct module_list list = MODULE_LIST_INIT;
1783        unsigned flags = ABSORB_GITDIR_RECURSE_SUBMODULES;
1784
1785        struct option embed_gitdir_options[] = {
1786                OPT_STRING(0, "prefix", &prefix,
1787                           N_("path"),
1788                           N_("path into the working tree")),
1789                OPT_BIT(0, "--recursive", &flags, N_("recurse into submodules"),
1790                        ABSORB_GITDIR_RECURSE_SUBMODULES),
1791                OPT_END()
1792        };
1793
1794        const char *const git_submodule_helper_usage[] = {
1795                N_("git submodule--helper embed-git-dir [<path>...]"),
1796                NULL
1797        };
1798
1799        argc = parse_options(argc, argv, prefix, embed_gitdir_options,
1800                             git_submodule_helper_usage, 0);
1801
1802        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1803                return 1;
1804
1805        for (i = 0; i < list.nr; i++)
1806                absorb_git_dir_into_superproject(prefix,
1807                                list.entries[i]->name, flags);
1808
1809        return 0;
1810}
1811
1812static int is_active(int argc, const char **argv, const char *prefix)
1813{
1814        if (argc != 2)
1815                die("submodule--helper is-active takes exactly 1 argument");
1816
1817        return !is_submodule_active(the_repository, argv[1]);
1818}
1819
1820#define SUPPORT_SUPER_PREFIX (1<<0)
1821
1822struct cmd_struct {
1823        const char *cmd;
1824        int (*fn)(int, const char **, const char *);
1825        unsigned option;
1826};
1827
1828static struct cmd_struct commands[] = {
1829        {"list", module_list, 0},
1830        {"name", module_name, 0},
1831        {"clone", module_clone, 0},
1832        {"update-clone", update_clone, 0},
1833        {"relative-path", resolve_relative_path, 0},
1834        {"resolve-relative-url", resolve_relative_url, 0},
1835        {"resolve-relative-url-test", resolve_relative_url_test, 0},
1836        {"init", module_init, SUPPORT_SUPER_PREFIX},
1837        {"status", module_status, SUPPORT_SUPER_PREFIX},
1838        {"print-default-remote", print_default_remote, 0},
1839        {"sync", module_sync, SUPPORT_SUPER_PREFIX},
1840        {"deinit", module_deinit, 0},
1841        {"remote-branch", resolve_remote_submodule_branch, 0},
1842        {"push-check", push_check, 0},
1843        {"absorb-git-dirs", absorb_git_dirs, SUPPORT_SUPER_PREFIX},
1844        {"is-active", is_active, 0},
1845};
1846
1847int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
1848{
1849        int i;
1850        if (argc < 2 || !strcmp(argv[1], "-h"))
1851                usage("git submodule--helper <command>");
1852
1853        for (i = 0; i < ARRAY_SIZE(commands); i++) {
1854                if (!strcmp(argv[1], commands[i].cmd)) {
1855                        if (get_super_prefix() &&
1856                            !(commands[i].option & SUPPORT_SUPER_PREFIX))
1857                                die(_("%s doesn't support --super-prefix"),
1858                                    commands[i].cmd);
1859                        return commands[i].fn(argc - 1, argv + 1, prefix);
1860                }
1861        }
1862
1863        die(_("'%s' is not a valid submodule--helper "
1864              "subcommand"), argv[1]);
1865}