Andrew's git / gitweb.git / builtin/submodule--helper.c
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builtin / submodule--helper.con commit refspec: convert valid_fetch_refspec to use parse_refspec (c8fa9ef)
   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 "refspec.h"
  16#include "connect.h"
  17#include "revision.h"
  18#include "diffcore.h"
  19#include "diff.h"
  20#include "object-store.h"
  21
  22#define OPT_QUIET (1 << 0)
  23#define OPT_CACHED (1 << 1)
  24#define OPT_RECURSIVE (1 << 2)
  25#define OPT_FORCE (1 << 3)
  26
  27typedef void (*each_submodule_fn)(const struct cache_entry *list_item,
  28                                  void *cb_data);
  29
  30static char *get_default_remote(void)
  31{
  32        char *dest = NULL, *ret;
  33        struct strbuf sb = STRBUF_INIT;
  34        const char *refname = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
  35
  36        if (!refname)
  37                die(_("No such ref: %s"), "HEAD");
  38
  39        /* detached HEAD */
  40        if (!strcmp(refname, "HEAD"))
  41                return xstrdup("origin");
  42
  43        if (!skip_prefix(refname, "refs/heads/", &refname))
  44                die(_("Expecting a full ref name, got %s"), refname);
  45
  46        strbuf_addf(&sb, "branch.%s.remote", refname);
  47        if (git_config_get_string(sb.buf, &dest))
  48                ret = xstrdup("origin");
  49        else
  50                ret = dest;
  51
  52        strbuf_release(&sb);
  53        return ret;
  54}
  55
  56static int print_default_remote(int argc, const char **argv, const char *prefix)
  57{
  58        const char *remote;
  59
  60        if (argc != 1)
  61                die(_("submodule--helper print-default-remote takes no arguments"));
  62
  63        remote = get_default_remote();
  64        if (remote)
  65                printf("%s\n", remote);
  66
  67        return 0;
  68}
  69
  70static int starts_with_dot_slash(const char *str)
  71{
  72        return str[0] == '.' && is_dir_sep(str[1]);
  73}
  74
  75static int starts_with_dot_dot_slash(const char *str)
  76{
  77        return str[0] == '.' && str[1] == '.' && is_dir_sep(str[2]);
  78}
  79
  80/*
  81 * Returns 1 if it was the last chop before ':'.
  82 */
  83static int chop_last_dir(char **remoteurl, int is_relative)
  84{
  85        char *rfind = find_last_dir_sep(*remoteurl);
  86        if (rfind) {
  87                *rfind = '\0';
  88                return 0;
  89        }
  90
  91        rfind = strrchr(*remoteurl, ':');
  92        if (rfind) {
  93                *rfind = '\0';
  94                return 1;
  95        }
  96
  97        if (is_relative || !strcmp(".", *remoteurl))
  98                die(_("cannot strip one component off url '%s'"),
  99                        *remoteurl);
 100
 101        free(*remoteurl);
 102        *remoteurl = xstrdup(".");
 103        return 0;
 104}
 105
 106/*
 107 * The `url` argument is the URL that navigates to the submodule origin
 108 * repo. When relative, this URL is relative to the superproject origin
 109 * URL repo. The `up_path` argument, if specified, is the relative
 110 * path that navigates from the submodule working tree to the superproject
 111 * working tree. Returns the origin URL of the submodule.
 112 *
 113 * Return either an absolute URL or filesystem path (if the superproject
 114 * origin URL is an absolute URL or filesystem path, respectively) or a
 115 * relative file system path (if the superproject origin URL is a relative
 116 * file system path).
 117 *
 118 * When the output is a relative file system path, the path is either
 119 * relative to the submodule working tree, if up_path is specified, or to
 120 * the superproject working tree otherwise.
 121 *
 122 * NEEDSWORK: This works incorrectly on the domain and protocol part.
 123 * remote_url      url              outcome          expectation
 124 * http://a.com/b  ../c             http://a.com/c   as is
 125 * http://a.com/b/ ../c             http://a.com/c   same as previous line, but
 126 *                                                   ignore trailing slash in url
 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    http:c           error out
 130 * http://a.com/b  ../../../../../c    .:c           error out
 131 * NEEDSWORK: Given how chop_last_dir() works, this function is broken
 132 * when a local part has a colon in its path component, too.
 133 */
 134static char *relative_url(const char *remote_url,
 135                                const char *url,
 136                                const char *up_path)
 137{
 138        int is_relative = 0;
 139        int colonsep = 0;
 140        char *out;
 141        char *remoteurl = xstrdup(remote_url);
 142        struct strbuf sb = STRBUF_INIT;
 143        size_t len = strlen(remoteurl);
 144
 145        if (is_dir_sep(remoteurl[len-1]))
 146                remoteurl[len-1] = '\0';
 147
 148        if (!url_is_local_not_ssh(remoteurl) || is_absolute_path(remoteurl))
 149                is_relative = 0;
 150        else {
 151                is_relative = 1;
 152                /*
 153                 * Prepend a './' to ensure all relative
 154                 * remoteurls start with './' or '../'
 155                 */
 156                if (!starts_with_dot_slash(remoteurl) &&
 157                    !starts_with_dot_dot_slash(remoteurl)) {
 158                        strbuf_reset(&sb);
 159                        strbuf_addf(&sb, "./%s", remoteurl);
 160                        free(remoteurl);
 161                        remoteurl = strbuf_detach(&sb, NULL);
 162                }
 163        }
 164        /*
 165         * When the url starts with '../', remove that and the
 166         * last directory in remoteurl.
 167         */
 168        while (url) {
 169                if (starts_with_dot_dot_slash(url)) {
 170                        url += 3;
 171                        colonsep |= chop_last_dir(&remoteurl, is_relative);
 172                } else if (starts_with_dot_slash(url))
 173                        url += 2;
 174                else
 175                        break;
 176        }
 177        strbuf_reset(&sb);
 178        strbuf_addf(&sb, "%s%s%s", remoteurl, colonsep ? ":" : "/", url);
 179        if (ends_with(url, "/"))
 180                strbuf_setlen(&sb, sb.len - 1);
 181        free(remoteurl);
 182
 183        if (starts_with_dot_slash(sb.buf))
 184                out = xstrdup(sb.buf + 2);
 185        else
 186                out = xstrdup(sb.buf);
 187        strbuf_reset(&sb);
 188
 189        if (!up_path || !is_relative)
 190                return out;
 191
 192        strbuf_addf(&sb, "%s%s", up_path, out);
 193        free(out);
 194        return strbuf_detach(&sb, NULL);
 195}
 196
 197static int resolve_relative_url(int argc, const char **argv, const char *prefix)
 198{
 199        char *remoteurl = NULL;
 200        char *remote = get_default_remote();
 201        const char *up_path = NULL;
 202        char *res;
 203        const char *url;
 204        struct strbuf sb = STRBUF_INIT;
 205
 206        if (argc != 2 && argc != 3)
 207                die("resolve-relative-url only accepts one or two arguments");
 208
 209        url = argv[1];
 210        strbuf_addf(&sb, "remote.%s.url", remote);
 211        free(remote);
 212
 213        if (git_config_get_string(sb.buf, &remoteurl))
 214                /* the repository is its own authoritative upstream */
 215                remoteurl = xgetcwd();
 216
 217        if (argc == 3)
 218                up_path = argv[2];
 219
 220        res = relative_url(remoteurl, url, up_path);
 221        puts(res);
 222        free(res);
 223        free(remoteurl);
 224        return 0;
 225}
 226
 227static int resolve_relative_url_test(int argc, const char **argv, const char *prefix)
 228{
 229        char *remoteurl, *res;
 230        const char *up_path, *url;
 231
 232        if (argc != 4)
 233                die("resolve-relative-url-test only accepts three arguments: <up_path> <remoteurl> <url>");
 234
 235        up_path = argv[1];
 236        remoteurl = xstrdup(argv[2]);
 237        url = argv[3];
 238
 239        if (!strcmp(up_path, "(null)"))
 240                up_path = NULL;
 241
 242        res = relative_url(remoteurl, url, up_path);
 243        puts(res);
 244        free(res);
 245        free(remoteurl);
 246        return 0;
 247}
 248
 249/* the result should be freed by the caller. */
 250static char *get_submodule_displaypath(const char *path, const char *prefix)
 251{
 252        const char *super_prefix = get_super_prefix();
 253
 254        if (prefix && super_prefix) {
 255                BUG("cannot have prefix '%s' and superprefix '%s'",
 256                    prefix, super_prefix);
 257        } else if (prefix) {
 258                struct strbuf sb = STRBUF_INIT;
 259                char *displaypath = xstrdup(relative_path(path, prefix, &sb));
 260                strbuf_release(&sb);
 261                return displaypath;
 262        } else if (super_prefix) {
 263                return xstrfmt("%s%s", super_prefix, path);
 264        } else {
 265                return xstrdup(path);
 266        }
 267}
 268
 269static char *compute_rev_name(const char *sub_path, const char* object_id)
 270{
 271        struct strbuf sb = STRBUF_INIT;
 272        const char ***d;
 273
 274        static const char *describe_bare[] = { NULL };
 275
 276        static const char *describe_tags[] = { "--tags", NULL };
 277
 278        static const char *describe_contains[] = { "--contains", NULL };
 279
 280        static const char *describe_all_always[] = { "--all", "--always", NULL };
 281
 282        static const char **describe_argv[] = { describe_bare, describe_tags,
 283                                                describe_contains,
 284                                                describe_all_always, NULL };
 285
 286        for (d = describe_argv; *d; d++) {
 287                struct child_process cp = CHILD_PROCESS_INIT;
 288                prepare_submodule_repo_env(&cp.env_array);
 289                cp.dir = sub_path;
 290                cp.git_cmd = 1;
 291                cp.no_stderr = 1;
 292
 293                argv_array_push(&cp.args, "describe");
 294                argv_array_pushv(&cp.args, *d);
 295                argv_array_push(&cp.args, object_id);
 296
 297                if (!capture_command(&cp, &sb, 0)) {
 298                        strbuf_strip_suffix(&sb, "\n");
 299                        return strbuf_detach(&sb, NULL);
 300                }
 301        }
 302
 303        strbuf_release(&sb);
 304        return NULL;
 305}
 306
 307struct module_list {
 308        const struct cache_entry **entries;
 309        int alloc, nr;
 310};
 311#define MODULE_LIST_INIT { NULL, 0, 0 }
 312
 313static int module_list_compute(int argc, const char **argv,
 314                               const char *prefix,
 315                               struct pathspec *pathspec,
 316                               struct module_list *list)
 317{
 318        int i, result = 0;
 319        char *ps_matched = NULL;
 320        parse_pathspec(pathspec, 0,
 321                       PATHSPEC_PREFER_FULL,
 322                       prefix, argv);
 323
 324        if (pathspec->nr)
 325                ps_matched = xcalloc(pathspec->nr, 1);
 326
 327        if (read_cache() < 0)
 328                die(_("index file corrupt"));
 329
 330        for (i = 0; i < active_nr; i++) {
 331                const struct cache_entry *ce = active_cache[i];
 332
 333                if (!match_pathspec(pathspec, ce->name, ce_namelen(ce),
 334                                    0, ps_matched, 1) ||
 335                    !S_ISGITLINK(ce->ce_mode))
 336                        continue;
 337
 338                ALLOC_GROW(list->entries, list->nr + 1, list->alloc);
 339                list->entries[list->nr++] = ce;
 340                while (i + 1 < active_nr &&
 341                       !strcmp(ce->name, active_cache[i + 1]->name))
 342                        /*
 343                         * Skip entries with the same name in different stages
 344                         * to make sure an entry is returned only once.
 345                         */
 346                        i++;
 347        }
 348
 349        if (ps_matched && report_path_error(ps_matched, pathspec, prefix))
 350                result = -1;
 351
 352        free(ps_matched);
 353
 354        return result;
 355}
 356
 357static void module_list_active(struct module_list *list)
 358{
 359        int i;
 360        struct module_list active_modules = MODULE_LIST_INIT;
 361
 362        for (i = 0; i < list->nr; i++) {
 363                const struct cache_entry *ce = list->entries[i];
 364
 365                if (!is_submodule_active(the_repository, ce->name))
 366                        continue;
 367
 368                ALLOC_GROW(active_modules.entries,
 369                           active_modules.nr + 1,
 370                           active_modules.alloc);
 371                active_modules.entries[active_modules.nr++] = ce;
 372        }
 373
 374        free(list->entries);
 375        *list = active_modules;
 376}
 377
 378static char *get_up_path(const char *path)
 379{
 380        int i;
 381        struct strbuf sb = STRBUF_INIT;
 382
 383        for (i = count_slashes(path); i; i--)
 384                strbuf_addstr(&sb, "../");
 385
 386        /*
 387         * Check if 'path' ends with slash or not
 388         * for having the same output for dir/sub_dir
 389         * and dir/sub_dir/
 390         */
 391        if (!is_dir_sep(path[strlen(path) - 1]))
 392                strbuf_addstr(&sb, "../");
 393
 394        return strbuf_detach(&sb, NULL);
 395}
 396
 397static int module_list(int argc, const char **argv, const char *prefix)
 398{
 399        int i;
 400        struct pathspec pathspec;
 401        struct module_list list = MODULE_LIST_INIT;
 402
 403        struct option module_list_options[] = {
 404                OPT_STRING(0, "prefix", &prefix,
 405                           N_("path"),
 406                           N_("alternative anchor for relative paths")),
 407                OPT_END()
 408        };
 409
 410        const char *const git_submodule_helper_usage[] = {
 411                N_("git submodule--helper list [--prefix=<path>] [<path>...]"),
 412                NULL
 413        };
 414
 415        argc = parse_options(argc, argv, prefix, module_list_options,
 416                             git_submodule_helper_usage, 0);
 417
 418        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 419                return 1;
 420
 421        for (i = 0; i < list.nr; i++) {
 422                const struct cache_entry *ce = list.entries[i];
 423
 424                if (ce_stage(ce))
 425                        printf("%06o %s U\t", ce->ce_mode, sha1_to_hex(null_sha1));
 426                else
 427                        printf("%06o %s %d\t", ce->ce_mode,
 428                               oid_to_hex(&ce->oid), ce_stage(ce));
 429
 430                fprintf(stdout, "%s\n", ce->name);
 431        }
 432        return 0;
 433}
 434
 435static void for_each_listed_submodule(const struct module_list *list,
 436                                      each_submodule_fn fn, void *cb_data)
 437{
 438        int i;
 439        for (i = 0; i < list->nr; i++)
 440                fn(list->entries[i], cb_data);
 441}
 442
 443struct init_cb {
 444        const char *prefix;
 445        unsigned int flags;
 446};
 447
 448#define INIT_CB_INIT { NULL, 0 }
 449
 450static void init_submodule(const char *path, const char *prefix,
 451                           unsigned int flags)
 452{
 453        const struct submodule *sub;
 454        struct strbuf sb = STRBUF_INIT;
 455        char *upd = NULL, *url = NULL, *displaypath;
 456
 457        displaypath = get_submodule_displaypath(path, prefix);
 458
 459        sub = submodule_from_path(the_repository, &null_oid, path);
 460
 461        if (!sub)
 462                die(_("No url found for submodule path '%s' in .gitmodules"),
 463                        displaypath);
 464
 465        /*
 466         * NEEDSWORK: In a multi-working-tree world, this needs to be
 467         * set in the per-worktree config.
 468         *
 469         * Set active flag for the submodule being initialized
 470         */
 471        if (!is_submodule_active(the_repository, path)) {
 472                strbuf_addf(&sb, "submodule.%s.active", sub->name);
 473                git_config_set_gently(sb.buf, "true");
 474                strbuf_reset(&sb);
 475        }
 476
 477        /*
 478         * Copy url setting when it is not set yet.
 479         * To look up the url in .git/config, we must not fall back to
 480         * .gitmodules, so look it up directly.
 481         */
 482        strbuf_addf(&sb, "submodule.%s.url", sub->name);
 483        if (git_config_get_string(sb.buf, &url)) {
 484                if (!sub->url)
 485                        die(_("No url found for submodule path '%s' in .gitmodules"),
 486                                displaypath);
 487
 488                url = xstrdup(sub->url);
 489
 490                /* Possibly a url relative to parent */
 491                if (starts_with_dot_dot_slash(url) ||
 492                    starts_with_dot_slash(url)) {
 493                        char *remoteurl, *relurl;
 494                        char *remote = get_default_remote();
 495                        struct strbuf remotesb = STRBUF_INIT;
 496                        strbuf_addf(&remotesb, "remote.%s.url", remote);
 497                        free(remote);
 498
 499                        if (git_config_get_string(remotesb.buf, &remoteurl)) {
 500                                warning(_("could not lookup configuration '%s'. Assuming this repository is its own authoritative upstream."), remotesb.buf);
 501                                remoteurl = xgetcwd();
 502                        }
 503                        relurl = relative_url(remoteurl, url, NULL);
 504                        strbuf_release(&remotesb);
 505                        free(remoteurl);
 506                        free(url);
 507                        url = relurl;
 508                }
 509
 510                if (git_config_set_gently(sb.buf, url))
 511                        die(_("Failed to register url for submodule path '%s'"),
 512                            displaypath);
 513                if (!(flags & OPT_QUIET))
 514                        fprintf(stderr,
 515                                _("Submodule '%s' (%s) registered for path '%s'\n"),
 516                                sub->name, url, displaypath);
 517        }
 518        strbuf_reset(&sb);
 519
 520        /* Copy "update" setting when it is not set yet */
 521        strbuf_addf(&sb, "submodule.%s.update", sub->name);
 522        if (git_config_get_string(sb.buf, &upd) &&
 523            sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
 524                if (sub->update_strategy.type == SM_UPDATE_COMMAND) {
 525                        fprintf(stderr, _("warning: command update mode suggested for submodule '%s'\n"),
 526                                sub->name);
 527                        upd = xstrdup("none");
 528                } else
 529                        upd = xstrdup(submodule_strategy_to_string(&sub->update_strategy));
 530
 531                if (git_config_set_gently(sb.buf, upd))
 532                        die(_("Failed to register update mode for submodule path '%s'"), displaypath);
 533        }
 534        strbuf_release(&sb);
 535        free(displaypath);
 536        free(url);
 537        free(upd);
 538}
 539
 540static void init_submodule_cb(const struct cache_entry *list_item, void *cb_data)
 541{
 542        struct init_cb *info = cb_data;
 543        init_submodule(list_item->name, info->prefix, info->flags);
 544}
 545
 546static int module_init(int argc, const char **argv, const char *prefix)
 547{
 548        struct init_cb info = INIT_CB_INIT;
 549        struct pathspec pathspec;
 550        struct module_list list = MODULE_LIST_INIT;
 551        int quiet = 0;
 552
 553        struct option module_init_options[] = {
 554                OPT__QUIET(&quiet, N_("Suppress output for initializing a submodule")),
 555                OPT_END()
 556        };
 557
 558        const char *const git_submodule_helper_usage[] = {
 559                N_("git submodule--helper init [<path>]"),
 560                NULL
 561        };
 562
 563        argc = parse_options(argc, argv, prefix, module_init_options,
 564                             git_submodule_helper_usage, 0);
 565
 566        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 567                return 1;
 568
 569        /*
 570         * If there are no path args and submodule.active is set then,
 571         * by default, only initialize 'active' modules.
 572         */
 573        if (!argc && git_config_get_value_multi("submodule.active"))
 574                module_list_active(&list);
 575
 576        info.prefix = prefix;
 577        if (quiet)
 578                info.flags |= OPT_QUIET;
 579
 580        for_each_listed_submodule(&list, init_submodule_cb, &info);
 581
 582        return 0;
 583}
 584
 585struct status_cb {
 586        const char *prefix;
 587        unsigned int flags;
 588};
 589
 590#define STATUS_CB_INIT { NULL, 0 }
 591
 592static void print_status(unsigned int flags, char state, const char *path,
 593                         const struct object_id *oid, const char *displaypath)
 594{
 595        if (flags & OPT_QUIET)
 596                return;
 597
 598        printf("%c%s %s", state, oid_to_hex(oid), displaypath);
 599
 600        if (state == ' ' || state == '+') {
 601                const char *name = compute_rev_name(path, oid_to_hex(oid));
 602
 603                if (name)
 604                        printf(" (%s)", name);
 605        }
 606
 607        printf("\n");
 608}
 609
 610static int handle_submodule_head_ref(const char *refname,
 611                                     const struct object_id *oid, int flags,
 612                                     void *cb_data)
 613{
 614        struct object_id *output = cb_data;
 615        if (oid)
 616                oidcpy(output, oid);
 617
 618        return 0;
 619}
 620
 621static void status_submodule(const char *path, const struct object_id *ce_oid,
 622                             unsigned int ce_flags, const char *prefix,
 623                             unsigned int flags)
 624{
 625        char *displaypath;
 626        struct argv_array diff_files_args = ARGV_ARRAY_INIT;
 627        struct rev_info rev;
 628        int diff_files_result;
 629
 630        if (!submodule_from_path(the_repository, &null_oid, path))
 631                die(_("no submodule mapping found in .gitmodules for path '%s'"),
 632                      path);
 633
 634        displaypath = get_submodule_displaypath(path, prefix);
 635
 636        if ((CE_STAGEMASK & ce_flags) >> CE_STAGESHIFT) {
 637                print_status(flags, 'U', path, &null_oid, displaypath);
 638                goto cleanup;
 639        }
 640
 641        if (!is_submodule_active(the_repository, path)) {
 642                print_status(flags, '-', path, ce_oid, displaypath);
 643                goto cleanup;
 644        }
 645
 646        argv_array_pushl(&diff_files_args, "diff-files",
 647                         "--ignore-submodules=dirty", "--quiet", "--",
 648                         path, NULL);
 649
 650        git_config(git_diff_basic_config, NULL);
 651        init_revisions(&rev, prefix);
 652        rev.abbrev = 0;
 653        diff_files_args.argc = setup_revisions(diff_files_args.argc,
 654                                               diff_files_args.argv,
 655                                               &rev, NULL);
 656        diff_files_result = run_diff_files(&rev, 0);
 657
 658        if (!diff_result_code(&rev.diffopt, diff_files_result)) {
 659                print_status(flags, ' ', path, ce_oid,
 660                             displaypath);
 661        } else if (!(flags & OPT_CACHED)) {
 662                struct object_id oid;
 663                struct ref_store *refs = get_submodule_ref_store(path);
 664
 665                if (!refs) {
 666                        print_status(flags, '-', path, ce_oid, displaypath);
 667                        goto cleanup;
 668                }
 669                if (refs_head_ref(refs, handle_submodule_head_ref, &oid))
 670                        die(_("could not resolve HEAD ref inside the "
 671                              "submodule '%s'"), path);
 672
 673                print_status(flags, '+', path, &oid, displaypath);
 674        } else {
 675                print_status(flags, '+', path, ce_oid, displaypath);
 676        }
 677
 678        if (flags & OPT_RECURSIVE) {
 679                struct child_process cpr = CHILD_PROCESS_INIT;
 680
 681                cpr.git_cmd = 1;
 682                cpr.dir = path;
 683                prepare_submodule_repo_env(&cpr.env_array);
 684
 685                argv_array_push(&cpr.args, "--super-prefix");
 686                argv_array_pushf(&cpr.args, "%s/", displaypath);
 687                argv_array_pushl(&cpr.args, "submodule--helper", "status",
 688                                 "--recursive", NULL);
 689
 690                if (flags & OPT_CACHED)
 691                        argv_array_push(&cpr.args, "--cached");
 692
 693                if (flags & OPT_QUIET)
 694                        argv_array_push(&cpr.args, "--quiet");
 695
 696                if (run_command(&cpr))
 697                        die(_("failed to recurse into submodule '%s'"), path);
 698        }
 699
 700cleanup:
 701        argv_array_clear(&diff_files_args);
 702        free(displaypath);
 703}
 704
 705static void status_submodule_cb(const struct cache_entry *list_item,
 706                                void *cb_data)
 707{
 708        struct status_cb *info = cb_data;
 709        status_submodule(list_item->name, &list_item->oid, list_item->ce_flags,
 710                         info->prefix, info->flags);
 711}
 712
 713static int module_status(int argc, const char **argv, const char *prefix)
 714{
 715        struct status_cb info = STATUS_CB_INIT;
 716        struct pathspec pathspec;
 717        struct module_list list = MODULE_LIST_INIT;
 718        int quiet = 0;
 719
 720        struct option module_status_options[] = {
 721                OPT__QUIET(&quiet, N_("Suppress submodule status output")),
 722                OPT_BIT(0, "cached", &info.flags, N_("Use commit stored in the index instead of the one stored in the submodule HEAD"), OPT_CACHED),
 723                OPT_BIT(0, "recursive", &info.flags, N_("recurse into nested submodules"), OPT_RECURSIVE),
 724                OPT_END()
 725        };
 726
 727        const char *const git_submodule_helper_usage[] = {
 728                N_("git submodule status [--quiet] [--cached] [--recursive] [<path>...]"),
 729                NULL
 730        };
 731
 732        argc = parse_options(argc, argv, prefix, module_status_options,
 733                             git_submodule_helper_usage, 0);
 734
 735        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 736                return 1;
 737
 738        info.prefix = prefix;
 739        if (quiet)
 740                info.flags |= OPT_QUIET;
 741
 742        for_each_listed_submodule(&list, status_submodule_cb, &info);
 743
 744        return 0;
 745}
 746
 747static int module_name(int argc, const char **argv, const char *prefix)
 748{
 749        const struct submodule *sub;
 750
 751        if (argc != 2)
 752                usage(_("git submodule--helper name <path>"));
 753
 754        sub = submodule_from_path(the_repository, &null_oid, argv[1]);
 755
 756        if (!sub)
 757                die(_("no submodule mapping found in .gitmodules for path '%s'"),
 758                    argv[1]);
 759
 760        printf("%s\n", sub->name);
 761
 762        return 0;
 763}
 764
 765struct sync_cb {
 766        const char *prefix;
 767        unsigned int flags;
 768};
 769
 770#define SYNC_CB_INIT { NULL, 0 }
 771
 772static void sync_submodule(const char *path, const char *prefix,
 773                           unsigned int flags)
 774{
 775        const struct submodule *sub;
 776        char *remote_key = NULL;
 777        char *sub_origin_url, *super_config_url, *displaypath;
 778        struct strbuf sb = STRBUF_INIT;
 779        struct child_process cp = CHILD_PROCESS_INIT;
 780        char *sub_config_path = NULL;
 781
 782        if (!is_submodule_active(the_repository, path))
 783                return;
 784
 785        sub = submodule_from_path(the_repository, &null_oid, path);
 786
 787        if (sub && sub->url) {
 788                if (starts_with_dot_dot_slash(sub->url) ||
 789                    starts_with_dot_slash(sub->url)) {
 790                        char *remote_url, *up_path;
 791                        char *remote = get_default_remote();
 792                        strbuf_addf(&sb, "remote.%s.url", remote);
 793
 794                        if (git_config_get_string(sb.buf, &remote_url))
 795                                remote_url = xgetcwd();
 796
 797                        up_path = get_up_path(path);
 798                        sub_origin_url = relative_url(remote_url, sub->url, up_path);
 799                        super_config_url = relative_url(remote_url, sub->url, NULL);
 800
 801                        free(remote);
 802                        free(up_path);
 803                        free(remote_url);
 804                } else {
 805                        sub_origin_url = xstrdup(sub->url);
 806                        super_config_url = xstrdup(sub->url);
 807                }
 808        } else {
 809                sub_origin_url = xstrdup("");
 810                super_config_url = xstrdup("");
 811        }
 812
 813        displaypath = get_submodule_displaypath(path, prefix);
 814
 815        if (!(flags & OPT_QUIET))
 816                printf(_("Synchronizing submodule url for '%s'\n"),
 817                         displaypath);
 818
 819        strbuf_reset(&sb);
 820        strbuf_addf(&sb, "submodule.%s.url", sub->name);
 821        if (git_config_set_gently(sb.buf, super_config_url))
 822                die(_("failed to register url for submodule path '%s'"),
 823                      displaypath);
 824
 825        if (!is_submodule_populated_gently(path, NULL))
 826                goto cleanup;
 827
 828        prepare_submodule_repo_env(&cp.env_array);
 829        cp.git_cmd = 1;
 830        cp.dir = path;
 831        argv_array_pushl(&cp.args, "submodule--helper",
 832                         "print-default-remote", NULL);
 833
 834        strbuf_reset(&sb);
 835        if (capture_command(&cp, &sb, 0))
 836                die(_("failed to get the default remote for submodule '%s'"),
 837                      path);
 838
 839        strbuf_strip_suffix(&sb, "\n");
 840        remote_key = xstrfmt("remote.%s.url", sb.buf);
 841
 842        strbuf_reset(&sb);
 843        submodule_to_gitdir(&sb, path);
 844        strbuf_addstr(&sb, "/config");
 845
 846        if (git_config_set_in_file_gently(sb.buf, remote_key, sub_origin_url))
 847                die(_("failed to update remote for submodule '%s'"),
 848                      path);
 849
 850        if (flags & OPT_RECURSIVE) {
 851                struct child_process cpr = CHILD_PROCESS_INIT;
 852
 853                cpr.git_cmd = 1;
 854                cpr.dir = path;
 855                prepare_submodule_repo_env(&cpr.env_array);
 856
 857                argv_array_push(&cpr.args, "--super-prefix");
 858                argv_array_pushf(&cpr.args, "%s/", displaypath);
 859                argv_array_pushl(&cpr.args, "submodule--helper", "sync",
 860                                 "--recursive", NULL);
 861
 862                if (flags & OPT_QUIET)
 863                        argv_array_push(&cpr.args, "--quiet");
 864
 865                if (run_command(&cpr))
 866                        die(_("failed to recurse into submodule '%s'"),
 867                              path);
 868        }
 869
 870cleanup:
 871        free(super_config_url);
 872        free(sub_origin_url);
 873        strbuf_release(&sb);
 874        free(remote_key);
 875        free(displaypath);
 876        free(sub_config_path);
 877}
 878
 879static void sync_submodule_cb(const struct cache_entry *list_item, void *cb_data)
 880{
 881        struct sync_cb *info = cb_data;
 882        sync_submodule(list_item->name, info->prefix, info->flags);
 883
 884}
 885
 886static int module_sync(int argc, const char **argv, const char *prefix)
 887{
 888        struct sync_cb info = SYNC_CB_INIT;
 889        struct pathspec pathspec;
 890        struct module_list list = MODULE_LIST_INIT;
 891        int quiet = 0;
 892        int recursive = 0;
 893
 894        struct option module_sync_options[] = {
 895                OPT__QUIET(&quiet, N_("Suppress output of synchronizing submodule url")),
 896                OPT_BOOL(0, "recursive", &recursive,
 897                        N_("Recurse into nested submodules")),
 898                OPT_END()
 899        };
 900
 901        const char *const git_submodule_helper_usage[] = {
 902                N_("git submodule--helper sync [--quiet] [--recursive] [<path>]"),
 903                NULL
 904        };
 905
 906        argc = parse_options(argc, argv, prefix, module_sync_options,
 907                             git_submodule_helper_usage, 0);
 908
 909        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
 910                return 1;
 911
 912        info.prefix = prefix;
 913        if (quiet)
 914                info.flags |= OPT_QUIET;
 915        if (recursive)
 916                info.flags |= OPT_RECURSIVE;
 917
 918        for_each_listed_submodule(&list, sync_submodule_cb, &info);
 919
 920        return 0;
 921}
 922
 923struct deinit_cb {
 924        const char *prefix;
 925        unsigned int flags;
 926};
 927#define DEINIT_CB_INIT { NULL, 0 }
 928
 929static void deinit_submodule(const char *path, const char *prefix,
 930                             unsigned int flags)
 931{
 932        const struct submodule *sub;
 933        char *displaypath = NULL;
 934        struct child_process cp_config = CHILD_PROCESS_INIT;
 935        struct strbuf sb_config = STRBUF_INIT;
 936        char *sub_git_dir = xstrfmt("%s/.git", path);
 937
 938        sub = submodule_from_path(the_repository, &null_oid, path);
 939
 940        if (!sub || !sub->name)
 941                goto cleanup;
 942
 943        displaypath = get_submodule_displaypath(path, prefix);
 944
 945        /* remove the submodule work tree (unless the user already did it) */
 946        if (is_directory(path)) {
 947                struct strbuf sb_rm = STRBUF_INIT;
 948                const char *format;
 949
 950                /*
 951                 * protect submodules containing a .git directory
 952                 * NEEDSWORK: instead of dying, automatically call
 953                 * absorbgitdirs and (possibly) warn.
 954                 */
 955                if (is_directory(sub_git_dir))
 956                        die(_("Submodule work tree '%s' contains a .git "
 957                              "directory (use 'rm -rf' if you really want "
 958                              "to remove it including all of its history)"),
 959                            displaypath);
 960
 961                if (!(flags & OPT_FORCE)) {
 962                        struct child_process cp_rm = CHILD_PROCESS_INIT;
 963                        cp_rm.git_cmd = 1;
 964                        argv_array_pushl(&cp_rm.args, "rm", "-qn",
 965                                         path, NULL);
 966
 967                        if (run_command(&cp_rm))
 968                                die(_("Submodule work tree '%s' contains local "
 969                                      "modifications; use '-f' to discard them"),
 970                                      displaypath);
 971                }
 972
 973                strbuf_addstr(&sb_rm, path);
 974
 975                if (!remove_dir_recursively(&sb_rm, 0))
 976                        format = _("Cleared directory '%s'\n");
 977                else
 978                        format = _("Could not remove submodule work tree '%s'\n");
 979
 980                if (!(flags & OPT_QUIET))
 981                        printf(format, displaypath);
 982
 983                strbuf_release(&sb_rm);
 984        }
 985
 986        if (mkdir(path, 0777))
 987                printf(_("could not create empty submodule directory %s"),
 988                      displaypath);
 989
 990        cp_config.git_cmd = 1;
 991        argv_array_pushl(&cp_config.args, "config", "--get-regexp", NULL);
 992        argv_array_pushf(&cp_config.args, "submodule.%s\\.", sub->name);
 993
 994        /* remove the .git/config entries (unless the user already did it) */
 995        if (!capture_command(&cp_config, &sb_config, 0) && sb_config.len) {
 996                char *sub_key = xstrfmt("submodule.%s", sub->name);
 997                /*
 998                 * remove the whole section so we have a clean state when
 999                 * the user later decides to init this submodule again
1000                 */
1001                git_config_rename_section_in_file(NULL, sub_key, NULL);
1002                if (!(flags & OPT_QUIET))
1003                        printf(_("Submodule '%s' (%s) unregistered for path '%s'\n"),
1004                                 sub->name, sub->url, displaypath);
1005                free(sub_key);
1006        }
1007
1008cleanup:
1009        free(displaypath);
1010        free(sub_git_dir);
1011        strbuf_release(&sb_config);
1012}
1013
1014static void deinit_submodule_cb(const struct cache_entry *list_item,
1015                                void *cb_data)
1016{
1017        struct deinit_cb *info = cb_data;
1018        deinit_submodule(list_item->name, info->prefix, info->flags);
1019}
1020
1021static int module_deinit(int argc, const char **argv, const char *prefix)
1022{
1023        struct deinit_cb info = DEINIT_CB_INIT;
1024        struct pathspec pathspec;
1025        struct module_list list = MODULE_LIST_INIT;
1026        int quiet = 0;
1027        int force = 0;
1028        int all = 0;
1029
1030        struct option module_deinit_options[] = {
1031                OPT__QUIET(&quiet, N_("Suppress submodule status output")),
1032                OPT__FORCE(&force, N_("Remove submodule working trees even if they contain local changes"), 0),
1033                OPT_BOOL(0, "all", &all, N_("Unregister all submodules")),
1034                OPT_END()
1035        };
1036
1037        const char *const git_submodule_helper_usage[] = {
1038                N_("git submodule deinit [--quiet] [-f | --force] [--all | [--] [<path>...]]"),
1039                NULL
1040        };
1041
1042        argc = parse_options(argc, argv, prefix, module_deinit_options,
1043                             git_submodule_helper_usage, 0);
1044
1045        if (all && argc) {
1046                error("pathspec and --all are incompatible");
1047                usage_with_options(git_submodule_helper_usage,
1048                                   module_deinit_options);
1049        }
1050
1051        if (!argc && !all)
1052                die(_("Use '--all' if you really want to deinitialize all submodules"));
1053
1054        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1055                return 1;
1056
1057        info.prefix = prefix;
1058        if (quiet)
1059                info.flags |= OPT_QUIET;
1060        if (force)
1061                info.flags |= OPT_FORCE;
1062
1063        for_each_listed_submodule(&list, deinit_submodule_cb, &info);
1064
1065        return 0;
1066}
1067
1068static int clone_submodule(const char *path, const char *gitdir, const char *url,
1069                           const char *depth, struct string_list *reference,
1070                           int quiet, int progress)
1071{
1072        struct child_process cp = CHILD_PROCESS_INIT;
1073
1074        argv_array_push(&cp.args, "clone");
1075        argv_array_push(&cp.args, "--no-checkout");
1076        if (quiet)
1077                argv_array_push(&cp.args, "--quiet");
1078        if (progress)
1079                argv_array_push(&cp.args, "--progress");
1080        if (depth && *depth)
1081                argv_array_pushl(&cp.args, "--depth", depth, NULL);
1082        if (reference->nr) {
1083                struct string_list_item *item;
1084                for_each_string_list_item(item, reference)
1085                        argv_array_pushl(&cp.args, "--reference",
1086                                         item->string, NULL);
1087        }
1088        if (gitdir && *gitdir)
1089                argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
1090
1091        argv_array_push(&cp.args, url);
1092        argv_array_push(&cp.args, path);
1093
1094        cp.git_cmd = 1;
1095        prepare_submodule_repo_env(&cp.env_array);
1096        cp.no_stdin = 1;
1097
1098        return run_command(&cp);
1099}
1100
1101struct submodule_alternate_setup {
1102        const char *submodule_name;
1103        enum SUBMODULE_ALTERNATE_ERROR_MODE {
1104                SUBMODULE_ALTERNATE_ERROR_DIE,
1105                SUBMODULE_ALTERNATE_ERROR_INFO,
1106                SUBMODULE_ALTERNATE_ERROR_IGNORE
1107        } error_mode;
1108        struct string_list *reference;
1109};
1110#define SUBMODULE_ALTERNATE_SETUP_INIT { NULL, \
1111        SUBMODULE_ALTERNATE_ERROR_IGNORE, NULL }
1112
1113static int add_possible_reference_from_superproject(
1114                struct alternate_object_database *alt, void *sas_cb)
1115{
1116        struct submodule_alternate_setup *sas = sas_cb;
1117
1118        /*
1119         * If the alternate object store is another repository, try the
1120         * standard layout with .git/(modules/<name>)+/objects
1121         */
1122        if (ends_with(alt->path, "/objects")) {
1123                char *sm_alternate;
1124                struct strbuf sb = STRBUF_INIT;
1125                struct strbuf err = STRBUF_INIT;
1126                strbuf_add(&sb, alt->path, strlen(alt->path) - strlen("objects"));
1127
1128                /*
1129                 * We need to end the new path with '/' to mark it as a dir,
1130                 * otherwise a submodule name containing '/' will be broken
1131                 * as the last part of a missing submodule reference would
1132                 * be taken as a file name.
1133                 */
1134                strbuf_addf(&sb, "modules/%s/", sas->submodule_name);
1135
1136                sm_alternate = compute_alternate_path(sb.buf, &err);
1137                if (sm_alternate) {
1138                        string_list_append(sas->reference, xstrdup(sb.buf));
1139                        free(sm_alternate);
1140                } else {
1141                        switch (sas->error_mode) {
1142                        case SUBMODULE_ALTERNATE_ERROR_DIE:
1143                                die(_("submodule '%s' cannot add alternate: %s"),
1144                                    sas->submodule_name, err.buf);
1145                        case SUBMODULE_ALTERNATE_ERROR_INFO:
1146                                fprintf(stderr, _("submodule '%s' cannot add alternate: %s"),
1147                                        sas->submodule_name, err.buf);
1148                        case SUBMODULE_ALTERNATE_ERROR_IGNORE:
1149                                ; /* nothing */
1150                        }
1151                }
1152                strbuf_release(&sb);
1153        }
1154
1155        return 0;
1156}
1157
1158static void prepare_possible_alternates(const char *sm_name,
1159                struct string_list *reference)
1160{
1161        char *sm_alternate = NULL, *error_strategy = NULL;
1162        struct submodule_alternate_setup sas = SUBMODULE_ALTERNATE_SETUP_INIT;
1163
1164        git_config_get_string("submodule.alternateLocation", &sm_alternate);
1165        if (!sm_alternate)
1166                return;
1167
1168        git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
1169
1170        if (!error_strategy)
1171                error_strategy = xstrdup("die");
1172
1173        sas.submodule_name = sm_name;
1174        sas.reference = reference;
1175        if (!strcmp(error_strategy, "die"))
1176                sas.error_mode = SUBMODULE_ALTERNATE_ERROR_DIE;
1177        else if (!strcmp(error_strategy, "info"))
1178                sas.error_mode = SUBMODULE_ALTERNATE_ERROR_INFO;
1179        else if (!strcmp(error_strategy, "ignore"))
1180                sas.error_mode = SUBMODULE_ALTERNATE_ERROR_IGNORE;
1181        else
1182                die(_("Value '%s' for submodule.alternateErrorStrategy is not recognized"), error_strategy);
1183
1184        if (!strcmp(sm_alternate, "superproject"))
1185                foreach_alt_odb(add_possible_reference_from_superproject, &sas);
1186        else if (!strcmp(sm_alternate, "no"))
1187                ; /* do nothing */
1188        else
1189                die(_("Value '%s' for submodule.alternateLocation is not recognized"), sm_alternate);
1190
1191        free(sm_alternate);
1192        free(error_strategy);
1193}
1194
1195static int module_clone(int argc, const char **argv, const char *prefix)
1196{
1197        const char *name = NULL, *url = NULL, *depth = NULL;
1198        int quiet = 0;
1199        int progress = 0;
1200        char *p, *path = NULL, *sm_gitdir;
1201        struct strbuf sb = STRBUF_INIT;
1202        struct string_list reference = STRING_LIST_INIT_NODUP;
1203        char *sm_alternate = NULL, *error_strategy = NULL;
1204
1205        struct option module_clone_options[] = {
1206                OPT_STRING(0, "prefix", &prefix,
1207                           N_("path"),
1208                           N_("alternative anchor for relative paths")),
1209                OPT_STRING(0, "path", &path,
1210                           N_("path"),
1211                           N_("where the new submodule will be cloned to")),
1212                OPT_STRING(0, "name", &name,
1213                           N_("string"),
1214                           N_("name of the new submodule")),
1215                OPT_STRING(0, "url", &url,
1216                           N_("string"),
1217                           N_("url where to clone the submodule from")),
1218                OPT_STRING_LIST(0, "reference", &reference,
1219                           N_("repo"),
1220                           N_("reference repository")),
1221                OPT_STRING(0, "depth", &depth,
1222                           N_("string"),
1223                           N_("depth for shallow clones")),
1224                OPT__QUIET(&quiet, "Suppress output for cloning a submodule"),
1225                OPT_BOOL(0, "progress", &progress,
1226                           N_("force cloning progress")),
1227                OPT_END()
1228        };
1229
1230        const char *const git_submodule_helper_usage[] = {
1231                N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
1232                   "[--reference <repository>] [--name <name>] [--depth <depth>] "
1233                   "--url <url> --path <path>"),
1234                NULL
1235        };
1236
1237        argc = parse_options(argc, argv, prefix, module_clone_options,
1238                             git_submodule_helper_usage, 0);
1239
1240        if (argc || !url || !path || !*path)
1241                usage_with_options(git_submodule_helper_usage,
1242                                   module_clone_options);
1243
1244        strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
1245        sm_gitdir = absolute_pathdup(sb.buf);
1246        strbuf_reset(&sb);
1247
1248        if (!is_absolute_path(path)) {
1249                strbuf_addf(&sb, "%s/%s", get_git_work_tree(), path);
1250                path = strbuf_detach(&sb, NULL);
1251        } else
1252                path = xstrdup(path);
1253
1254        if (!file_exists(sm_gitdir)) {
1255                if (safe_create_leading_directories_const(sm_gitdir) < 0)
1256                        die(_("could not create directory '%s'"), sm_gitdir);
1257
1258                prepare_possible_alternates(name, &reference);
1259
1260                if (clone_submodule(path, sm_gitdir, url, depth, &reference,
1261                                    quiet, progress))
1262                        die(_("clone of '%s' into submodule path '%s' failed"),
1263                            url, path);
1264        } else {
1265                if (safe_create_leading_directories_const(path) < 0)
1266                        die(_("could not create directory '%s'"), path);
1267                strbuf_addf(&sb, "%s/index", sm_gitdir);
1268                unlink_or_warn(sb.buf);
1269                strbuf_reset(&sb);
1270        }
1271
1272        connect_work_tree_and_git_dir(path, sm_gitdir, 0);
1273
1274        p = git_pathdup_submodule(path, "config");
1275        if (!p)
1276                die(_("could not get submodule directory for '%s'"), path);
1277
1278        /* setup alternateLocation and alternateErrorStrategy in the cloned submodule if needed */
1279        git_config_get_string("submodule.alternateLocation", &sm_alternate);
1280        if (sm_alternate)
1281                git_config_set_in_file(p, "submodule.alternateLocation",
1282                                           sm_alternate);
1283        git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
1284        if (error_strategy)
1285                git_config_set_in_file(p, "submodule.alternateErrorStrategy",
1286                                           error_strategy);
1287
1288        free(sm_alternate);
1289        free(error_strategy);
1290
1291        strbuf_release(&sb);
1292        free(sm_gitdir);
1293        free(path);
1294        free(p);
1295        return 0;
1296}
1297
1298struct submodule_update_clone {
1299        /* index into 'list', the list of submodules to look into for cloning */
1300        int current;
1301        struct module_list list;
1302        unsigned warn_if_uninitialized : 1;
1303
1304        /* update parameter passed via commandline */
1305        struct submodule_update_strategy update;
1306
1307        /* configuration parameters which are passed on to the children */
1308        int progress;
1309        int quiet;
1310        int recommend_shallow;
1311        struct string_list references;
1312        const char *depth;
1313        const char *recursive_prefix;
1314        const char *prefix;
1315
1316        /* Machine-readable status lines to be consumed by git-submodule.sh */
1317        struct string_list projectlines;
1318
1319        /* If we want to stop as fast as possible and return an error */
1320        unsigned quickstop : 1;
1321
1322        /* failed clones to be retried again */
1323        const struct cache_entry **failed_clones;
1324        int failed_clones_nr, failed_clones_alloc;
1325};
1326#define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
1327        SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, \
1328        NULL, NULL, NULL, \
1329        STRING_LIST_INIT_DUP, 0, NULL, 0, 0}
1330
1331
1332static void next_submodule_warn_missing(struct submodule_update_clone *suc,
1333                struct strbuf *out, const char *displaypath)
1334{
1335        /*
1336         * Only mention uninitialized submodules when their
1337         * paths have been specified.
1338         */
1339        if (suc->warn_if_uninitialized) {
1340                strbuf_addf(out,
1341                        _("Submodule path '%s' not initialized"),
1342                        displaypath);
1343                strbuf_addch(out, '\n');
1344                strbuf_addstr(out,
1345                        _("Maybe you want to use 'update --init'?"));
1346                strbuf_addch(out, '\n');
1347        }
1348}
1349
1350/**
1351 * Determine whether 'ce' needs to be cloned. If so, prepare the 'child' to
1352 * run the clone. Returns 1 if 'ce' needs to be cloned, 0 otherwise.
1353 */
1354static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
1355                                           struct child_process *child,
1356                                           struct submodule_update_clone *suc,
1357                                           struct strbuf *out)
1358{
1359        const struct submodule *sub = NULL;
1360        const char *url = NULL;
1361        const char *update_string;
1362        enum submodule_update_type update_type;
1363        char *key;
1364        struct strbuf displaypath_sb = STRBUF_INIT;
1365        struct strbuf sb = STRBUF_INIT;
1366        const char *displaypath = NULL;
1367        int needs_cloning = 0;
1368
1369        if (ce_stage(ce)) {
1370                if (suc->recursive_prefix)
1371                        strbuf_addf(&sb, "%s/%s", suc->recursive_prefix, ce->name);
1372                else
1373                        strbuf_addstr(&sb, ce->name);
1374                strbuf_addf(out, _("Skipping unmerged submodule %s"), sb.buf);
1375                strbuf_addch(out, '\n');
1376                goto cleanup;
1377        }
1378
1379        sub = submodule_from_path(the_repository, &null_oid, ce->name);
1380
1381        if (suc->recursive_prefix)
1382                displaypath = relative_path(suc->recursive_prefix,
1383                                            ce->name, &displaypath_sb);
1384        else
1385                displaypath = ce->name;
1386
1387        if (!sub) {
1388                next_submodule_warn_missing(suc, out, displaypath);
1389                goto cleanup;
1390        }
1391
1392        key = xstrfmt("submodule.%s.update", sub->name);
1393        if (!repo_config_get_string_const(the_repository, key, &update_string)) {
1394                update_type = parse_submodule_update_type(update_string);
1395        } else {
1396                update_type = sub->update_strategy.type;
1397        }
1398        free(key);
1399
1400        if (suc->update.type == SM_UPDATE_NONE
1401            || (suc->update.type == SM_UPDATE_UNSPECIFIED
1402                && update_type == SM_UPDATE_NONE)) {
1403                strbuf_addf(out, _("Skipping submodule '%s'"), displaypath);
1404                strbuf_addch(out, '\n');
1405                goto cleanup;
1406        }
1407
1408        /* Check if the submodule has been initialized. */
1409        if (!is_submodule_active(the_repository, ce->name)) {
1410                next_submodule_warn_missing(suc, out, displaypath);
1411                goto cleanup;
1412        }
1413
1414        strbuf_reset(&sb);
1415        strbuf_addf(&sb, "submodule.%s.url", sub->name);
1416        if (repo_config_get_string_const(the_repository, sb.buf, &url))
1417                url = sub->url;
1418
1419        strbuf_reset(&sb);
1420        strbuf_addf(&sb, "%s/.git", ce->name);
1421        needs_cloning = !file_exists(sb.buf);
1422
1423        strbuf_reset(&sb);
1424        strbuf_addf(&sb, "%06o %s %d %d\t%s\n", ce->ce_mode,
1425                        oid_to_hex(&ce->oid), ce_stage(ce),
1426                        needs_cloning, ce->name);
1427        string_list_append(&suc->projectlines, sb.buf);
1428
1429        if (!needs_cloning)
1430                goto cleanup;
1431
1432        child->git_cmd = 1;
1433        child->no_stdin = 1;
1434        child->stdout_to_stderr = 1;
1435        child->err = -1;
1436        argv_array_push(&child->args, "submodule--helper");
1437        argv_array_push(&child->args, "clone");
1438        if (suc->progress)
1439                argv_array_push(&child->args, "--progress");
1440        if (suc->quiet)
1441                argv_array_push(&child->args, "--quiet");
1442        if (suc->prefix)
1443                argv_array_pushl(&child->args, "--prefix", suc->prefix, NULL);
1444        if (suc->recommend_shallow && sub->recommend_shallow == 1)
1445                argv_array_push(&child->args, "--depth=1");
1446        argv_array_pushl(&child->args, "--path", sub->path, NULL);
1447        argv_array_pushl(&child->args, "--name", sub->name, NULL);
1448        argv_array_pushl(&child->args, "--url", url, NULL);
1449        if (suc->references.nr) {
1450                struct string_list_item *item;
1451                for_each_string_list_item(item, &suc->references)
1452                        argv_array_pushl(&child->args, "--reference", item->string, NULL);
1453        }
1454        if (suc->depth)
1455                argv_array_push(&child->args, suc->depth);
1456
1457cleanup:
1458        strbuf_reset(&displaypath_sb);
1459        strbuf_reset(&sb);
1460
1461        return needs_cloning;
1462}
1463
1464static int update_clone_get_next_task(struct child_process *child,
1465                                      struct strbuf *err,
1466                                      void *suc_cb,
1467                                      void **idx_task_cb)
1468{
1469        struct submodule_update_clone *suc = suc_cb;
1470        const struct cache_entry *ce;
1471        int index;
1472
1473        for (; suc->current < suc->list.nr; suc->current++) {
1474                ce = suc->list.entries[suc->current];
1475                if (prepare_to_clone_next_submodule(ce, child, suc, err)) {
1476                        int *p = xmalloc(sizeof(*p));
1477                        *p = suc->current;
1478                        *idx_task_cb = p;
1479                        suc->current++;
1480                        return 1;
1481                }
1482        }
1483
1484        /*
1485         * The loop above tried cloning each submodule once, now try the
1486         * stragglers again, which we can imagine as an extension of the
1487         * entry list.
1488         */
1489        index = suc->current - suc->list.nr;
1490        if (index < suc->failed_clones_nr) {
1491                int *p;
1492                ce = suc->failed_clones[index];
1493                if (!prepare_to_clone_next_submodule(ce, child, suc, err)) {
1494                        suc->current ++;
1495                        strbuf_addstr(err, "BUG: submodule considered for "
1496                                           "cloning, doesn't need cloning "
1497                                           "any more?\n");
1498                        return 0;
1499                }
1500                p = xmalloc(sizeof(*p));
1501                *p = suc->current;
1502                *idx_task_cb = p;
1503                suc->current ++;
1504                return 1;
1505        }
1506
1507        return 0;
1508}
1509
1510static int update_clone_start_failure(struct strbuf *err,
1511                                      void *suc_cb,
1512                                      void *idx_task_cb)
1513{
1514        struct submodule_update_clone *suc = suc_cb;
1515        suc->quickstop = 1;
1516        return 1;
1517}
1518
1519static int update_clone_task_finished(int result,
1520                                      struct strbuf *err,
1521                                      void *suc_cb,
1522                                      void *idx_task_cb)
1523{
1524        const struct cache_entry *ce;
1525        struct submodule_update_clone *suc = suc_cb;
1526
1527        int *idxP = idx_task_cb;
1528        int idx = *idxP;
1529        free(idxP);
1530
1531        if (!result)
1532                return 0;
1533
1534        if (idx < suc->list.nr) {
1535                ce  = suc->list.entries[idx];
1536                strbuf_addf(err, _("Failed to clone '%s'. Retry scheduled"),
1537                            ce->name);
1538                strbuf_addch(err, '\n');
1539                ALLOC_GROW(suc->failed_clones,
1540                           suc->failed_clones_nr + 1,
1541                           suc->failed_clones_alloc);
1542                suc->failed_clones[suc->failed_clones_nr++] = ce;
1543                return 0;
1544        } else {
1545                idx -= suc->list.nr;
1546                ce  = suc->failed_clones[idx];
1547                strbuf_addf(err, _("Failed to clone '%s' a second time, aborting"),
1548                            ce->name);
1549                strbuf_addch(err, '\n');
1550                suc->quickstop = 1;
1551                return 1;
1552        }
1553
1554        return 0;
1555}
1556
1557static int gitmodules_update_clone_config(const char *var, const char *value,
1558                                          void *cb)
1559{
1560        int *max_jobs = cb;
1561        if (!strcmp(var, "submodule.fetchjobs"))
1562                *max_jobs = parse_submodule_fetchjobs(var, value);
1563        return 0;
1564}
1565
1566static int update_clone(int argc, const char **argv, const char *prefix)
1567{
1568        const char *update = NULL;
1569        int max_jobs = 1;
1570        struct string_list_item *item;
1571        struct pathspec pathspec;
1572        struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
1573
1574        struct option module_update_clone_options[] = {
1575                OPT_STRING(0, "prefix", &prefix,
1576                           N_("path"),
1577                           N_("path into the working tree")),
1578                OPT_STRING(0, "recursive-prefix", &suc.recursive_prefix,
1579                           N_("path"),
1580                           N_("path into the working tree, across nested "
1581                              "submodule boundaries")),
1582                OPT_STRING(0, "update", &update,
1583                           N_("string"),
1584                           N_("rebase, merge, checkout or none")),
1585                OPT_STRING_LIST(0, "reference", &suc.references, N_("repo"),
1586                           N_("reference repository")),
1587                OPT_STRING(0, "depth", &suc.depth, "<depth>",
1588                           N_("Create a shallow clone truncated to the "
1589                              "specified number of revisions")),
1590                OPT_INTEGER('j', "jobs", &max_jobs,
1591                            N_("parallel jobs")),
1592                OPT_BOOL(0, "recommend-shallow", &suc.recommend_shallow,
1593                            N_("whether the initial clone should follow the shallow recommendation")),
1594                OPT__QUIET(&suc.quiet, N_("don't print cloning progress")),
1595                OPT_BOOL(0, "progress", &suc.progress,
1596                            N_("force cloning progress")),
1597                OPT_END()
1598        };
1599
1600        const char *const git_submodule_helper_usage[] = {
1601                N_("git submodule--helper update_clone [--prefix=<path>] [<path>...]"),
1602                NULL
1603        };
1604        suc.prefix = prefix;
1605
1606        config_from_gitmodules(gitmodules_update_clone_config, &max_jobs);
1607        git_config(gitmodules_update_clone_config, &max_jobs);
1608
1609        argc = parse_options(argc, argv, prefix, module_update_clone_options,
1610                             git_submodule_helper_usage, 0);
1611
1612        if (update)
1613                if (parse_submodule_update_strategy(update, &suc.update) < 0)
1614                        die(_("bad value for update parameter"));
1615
1616        if (module_list_compute(argc, argv, prefix, &pathspec, &suc.list) < 0)
1617                return 1;
1618
1619        if (pathspec.nr)
1620                suc.warn_if_uninitialized = 1;
1621
1622        run_processes_parallel(max_jobs,
1623                               update_clone_get_next_task,
1624                               update_clone_start_failure,
1625                               update_clone_task_finished,
1626                               &suc);
1627
1628        /*
1629         * We saved the output and put it out all at once now.
1630         * That means:
1631         * - the listener does not have to interleave their (checkout)
1632         *   work with our fetching.  The writes involved in a
1633         *   checkout involve more straightforward sequential I/O.
1634         * - the listener can avoid doing any work if fetching failed.
1635         */
1636        if (suc.quickstop)
1637                return 1;
1638
1639        for_each_string_list_item(item, &suc.projectlines)
1640                fprintf(stdout, "%s", item->string);
1641
1642        return 0;
1643}
1644
1645static int resolve_relative_path(int argc, const char **argv, const char *prefix)
1646{
1647        struct strbuf sb = STRBUF_INIT;
1648        if (argc != 3)
1649                die("submodule--helper relative-path takes exactly 2 arguments, got %d", argc);
1650
1651        printf("%s", relative_path(argv[1], argv[2], &sb));
1652        strbuf_release(&sb);
1653        return 0;
1654}
1655
1656static const char *remote_submodule_branch(const char *path)
1657{
1658        const struct submodule *sub;
1659        const char *branch = NULL;
1660        char *key;
1661
1662        sub = submodule_from_path(the_repository, &null_oid, path);
1663        if (!sub)
1664                return NULL;
1665
1666        key = xstrfmt("submodule.%s.branch", sub->name);
1667        if (repo_config_get_string_const(the_repository, key, &branch))
1668                branch = sub->branch;
1669        free(key);
1670
1671        if (!branch)
1672                return "master";
1673
1674        if (!strcmp(branch, ".")) {
1675                const char *refname = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
1676
1677                if (!refname)
1678                        die(_("No such ref: %s"), "HEAD");
1679
1680                /* detached HEAD */
1681                if (!strcmp(refname, "HEAD"))
1682                        die(_("Submodule (%s) branch configured to inherit "
1683                              "branch from superproject, but the superproject "
1684                              "is not on any branch"), sub->name);
1685
1686                if (!skip_prefix(refname, "refs/heads/", &refname))
1687                        die(_("Expecting a full ref name, got %s"), refname);
1688                return refname;
1689        }
1690
1691        return branch;
1692}
1693
1694static int resolve_remote_submodule_branch(int argc, const char **argv,
1695                const char *prefix)
1696{
1697        const char *ret;
1698        struct strbuf sb = STRBUF_INIT;
1699        if (argc != 2)
1700                die("submodule--helper remote-branch takes exactly one arguments, got %d", argc);
1701
1702        ret = remote_submodule_branch(argv[1]);
1703        if (!ret)
1704                die("submodule %s doesn't exist", argv[1]);
1705
1706        printf("%s", ret);
1707        strbuf_release(&sb);
1708        return 0;
1709}
1710
1711static int push_check(int argc, const char **argv, const char *prefix)
1712{
1713        struct remote *remote;
1714        const char *superproject_head;
1715        char *head;
1716        int detached_head = 0;
1717        struct object_id head_oid;
1718
1719        if (argc < 3)
1720                die("submodule--helper push-check requires at least 2 arguments");
1721
1722        /*
1723         * superproject's resolved head ref.
1724         * if HEAD then the superproject is in a detached head state, otherwise
1725         * it will be the resolved head ref.
1726         */
1727        superproject_head = argv[1];
1728        argv++;
1729        argc--;
1730        /* Get the submodule's head ref and determine if it is detached */
1731        head = resolve_refdup("HEAD", 0, &head_oid, NULL);
1732        if (!head)
1733                die(_("Failed to resolve HEAD as a valid ref."));
1734        if (!strcmp(head, "HEAD"))
1735                detached_head = 1;
1736
1737        /*
1738         * The remote must be configured.
1739         * This is to avoid pushing to the exact same URL as the parent.
1740         */
1741        remote = pushremote_get(argv[1]);
1742        if (!remote || remote->origin == REMOTE_UNCONFIGURED)
1743                die("remote '%s' not configured", argv[1]);
1744
1745        /* Check the refspec */
1746        if (argc > 2) {
1747                int i, refspec_nr = argc - 2;
1748                struct ref *local_refs = get_local_heads();
1749                struct refspec_item *refspec = parse_push_refspec(refspec_nr,
1750                                                             argv + 2);
1751
1752                for (i = 0; i < refspec_nr; i++) {
1753                        struct refspec_item *rs = refspec + i;
1754
1755                        if (rs->pattern || rs->matching)
1756                                continue;
1757
1758                        /* LHS must match a single ref */
1759                        switch (count_refspec_match(rs->src, local_refs, NULL)) {
1760                        case 1:
1761                                break;
1762                        case 0:
1763                                /*
1764                                 * If LHS matches 'HEAD' then we need to ensure
1765                                 * that it matches the same named branch
1766                                 * checked out in the superproject.
1767                                 */
1768                                if (!strcmp(rs->src, "HEAD")) {
1769                                        if (!detached_head &&
1770                                            !strcmp(head, superproject_head))
1771                                                break;
1772                                        die("HEAD does not match the named branch in the superproject");
1773                                }
1774                                /* fallthrough */
1775                        default:
1776                                die("src refspec '%s' must name a ref",
1777                                    rs->src);
1778                        }
1779                }
1780                free_refspec(refspec_nr, refspec);
1781        }
1782        free(head);
1783
1784        return 0;
1785}
1786
1787static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
1788{
1789        int i;
1790        struct pathspec pathspec;
1791        struct module_list list = MODULE_LIST_INIT;
1792        unsigned flags = ABSORB_GITDIR_RECURSE_SUBMODULES;
1793
1794        struct option embed_gitdir_options[] = {
1795                OPT_STRING(0, "prefix", &prefix,
1796                           N_("path"),
1797                           N_("path into the working tree")),
1798                OPT_BIT(0, "--recursive", &flags, N_("recurse into submodules"),
1799                        ABSORB_GITDIR_RECURSE_SUBMODULES),
1800                OPT_END()
1801        };
1802
1803        const char *const git_submodule_helper_usage[] = {
1804                N_("git submodule--helper embed-git-dir [<path>...]"),
1805                NULL
1806        };
1807
1808        argc = parse_options(argc, argv, prefix, embed_gitdir_options,
1809                             git_submodule_helper_usage, 0);
1810
1811        if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1812                return 1;
1813
1814        for (i = 0; i < list.nr; i++)
1815                absorb_git_dir_into_superproject(prefix,
1816                                list.entries[i]->name, flags);
1817
1818        return 0;
1819}
1820
1821static int is_active(int argc, const char **argv, const char *prefix)
1822{
1823        if (argc != 2)
1824                die("submodule--helper is-active takes exactly 1 argument");
1825
1826        return !is_submodule_active(the_repository, argv[1]);
1827}
1828
1829#define SUPPORT_SUPER_PREFIX (1<<0)
1830
1831struct cmd_struct {
1832        const char *cmd;
1833        int (*fn)(int, const char **, const char *);
1834        unsigned option;
1835};
1836
1837static struct cmd_struct commands[] = {
1838        {"list", module_list, 0},
1839        {"name", module_name, 0},
1840        {"clone", module_clone, 0},
1841        {"update-clone", update_clone, 0},
1842        {"relative-path", resolve_relative_path, 0},
1843        {"resolve-relative-url", resolve_relative_url, 0},
1844        {"resolve-relative-url-test", resolve_relative_url_test, 0},
1845        {"init", module_init, SUPPORT_SUPER_PREFIX},
1846        {"status", module_status, SUPPORT_SUPER_PREFIX},
1847        {"print-default-remote", print_default_remote, 0},
1848        {"sync", module_sync, SUPPORT_SUPER_PREFIX},
1849        {"deinit", module_deinit, 0},
1850        {"remote-branch", resolve_remote_submodule_branch, 0},
1851        {"push-check", push_check, 0},
1852        {"absorb-git-dirs", absorb_git_dirs, SUPPORT_SUPER_PREFIX},
1853        {"is-active", is_active, 0},
1854};
1855
1856int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
1857{
1858        int i;
1859        if (argc < 2 || !strcmp(argv[1], "-h"))
1860                usage("git submodule--helper <command>");
1861
1862        for (i = 0; i < ARRAY_SIZE(commands); i++) {
1863                if (!strcmp(argv[1], commands[i].cmd)) {
1864                        if (get_super_prefix() &&
1865                            !(commands[i].option & SUPPORT_SUPER_PREFIX))
1866                                die(_("%s doesn't support --super-prefix"),
1867                                    commands[i].cmd);
1868                        return commands[i].fn(argc - 1, argv + 1, prefix);
1869                }
1870        }
1871
1872        die(_("'%s' is not a valid submodule--helper "
1873              "subcommand"), argv[1]);
1874}