Andrew's git / gitweb.git / submodule.c
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submodule.con commit http: refactor options to http_get_* (1bbcc22)
   1#include "cache.h"
   2#include "submodule.h"
   3#include "dir.h"
   4#include "diff.h"
   5#include "commit.h"
   6#include "revision.h"
   7#include "run-command.h"
   8#include "diffcore.h"
   9#include "refs.h"
  10#include "string-list.h"
  11#include "sha1-array.h"
  12#include "argv-array.h"
  13
  14static struct string_list config_name_for_path;
  15static struct string_list config_fetch_recurse_submodules_for_name;
  16static struct string_list config_ignore_for_name;
  17static int config_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND;
  18static struct string_list changed_submodule_paths;
  19static int initialized_fetch_ref_tips;
  20static struct sha1_array ref_tips_before_fetch;
  21static struct sha1_array ref_tips_after_fetch;
  22
  23/*
  24 * The following flag is set if the .gitmodules file is unmerged. We then
  25 * disable recursion for all submodules where .git/config doesn't have a
  26 * matching config entry because we can't guess what might be configured in
  27 * .gitmodules unless the user resolves the conflict. When a command line
  28 * option is given (which always overrides configuration) this flag will be
  29 * ignored.
  30 */
  31static int gitmodules_is_unmerged;
  32
  33static int add_submodule_odb(const char *path)
  34{
  35        struct strbuf objects_directory = STRBUF_INIT;
  36        struct alternate_object_database *alt_odb;
  37        int ret = 0;
  38        const char *git_dir;
  39
  40        strbuf_addf(&objects_directory, "%s/.git", path);
  41        git_dir = read_gitfile(objects_directory.buf);
  42        if (git_dir) {
  43                strbuf_reset(&objects_directory);
  44                strbuf_addstr(&objects_directory, git_dir);
  45        }
  46        strbuf_addstr(&objects_directory, "/objects/");
  47        if (!is_directory(objects_directory.buf)) {
  48                ret = -1;
  49                goto done;
  50        }
  51        /* avoid adding it twice */
  52        for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
  53                if (alt_odb->name - alt_odb->base == objects_directory.len &&
  54                                !strncmp(alt_odb->base, objects_directory.buf,
  55                                        objects_directory.len))
  56                        goto done;
  57
  58        alt_odb = xmalloc(objects_directory.len + 42 + sizeof(*alt_odb));
  59        alt_odb->next = alt_odb_list;
  60        strcpy(alt_odb->base, objects_directory.buf);
  61        alt_odb->name = alt_odb->base + objects_directory.len;
  62        alt_odb->name[2] = '/';
  63        alt_odb->name[40] = '\0';
  64        alt_odb->name[41] = '\0';
  65        alt_odb_list = alt_odb;
  66
  67        /* add possible alternates from the submodule */
  68        read_info_alternates(objects_directory.buf, 0);
  69        prepare_alt_odb();
  70done:
  71        strbuf_release(&objects_directory);
  72        return ret;
  73}
  74
  75void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
  76                                             const char *path)
  77{
  78        struct string_list_item *path_option, *ignore_option;
  79        path_option = unsorted_string_list_lookup(&config_name_for_path, path);
  80        if (path_option) {
  81                ignore_option = unsorted_string_list_lookup(&config_ignore_for_name, path_option->util);
  82                if (ignore_option)
  83                        handle_ignore_submodules_arg(diffopt, ignore_option->util);
  84                else if (gitmodules_is_unmerged)
  85                        DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
  86        }
  87}
  88
  89int submodule_config(const char *var, const char *value, void *cb)
  90{
  91        if (!prefixcmp(var, "submodule."))
  92                return parse_submodule_config_option(var, value);
  93        else if (!strcmp(var, "fetch.recursesubmodules")) {
  94                config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
  95                return 0;
  96        }
  97        return 0;
  98}
  99
 100void gitmodules_config(void)
 101{
 102        const char *work_tree = get_git_work_tree();
 103        if (work_tree) {
 104                struct strbuf gitmodules_path = STRBUF_INIT;
 105                int pos;
 106                strbuf_addstr(&gitmodules_path, work_tree);
 107                strbuf_addstr(&gitmodules_path, "/.gitmodules");
 108                if (read_cache() < 0)
 109                        die("index file corrupt");
 110                pos = cache_name_pos(".gitmodules", 11);
 111                if (pos < 0) { /* .gitmodules not found or isn't merged */
 112                        pos = -1 - pos;
 113                        if (active_nr > pos) {  /* there is a .gitmodules */
 114                                const struct cache_entry *ce = active_cache[pos];
 115                                if (ce_namelen(ce) == 11 &&
 116                                    !memcmp(ce->name, ".gitmodules", 11))
 117                                        gitmodules_is_unmerged = 1;
 118                        }
 119                }
 120
 121                if (!gitmodules_is_unmerged)
 122                        git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
 123                strbuf_release(&gitmodules_path);
 124        }
 125}
 126
 127int parse_submodule_config_option(const char *var, const char *value)
 128{
 129        struct string_list_item *config;
 130        const char *name, *key;
 131        int namelen;
 132
 133        if (parse_config_key(var, "submodule", &name, &namelen, &key) < 0 || !name)
 134                return 0;
 135
 136        if (!strcmp(key, "path")) {
 137                if (!value)
 138                        return config_error_nonbool(var);
 139
 140                config = unsorted_string_list_lookup(&config_name_for_path, value);
 141                if (config)
 142                        free(config->util);
 143                else
 144                        config = string_list_append(&config_name_for_path, xstrdup(value));
 145                config->util = xmemdupz(name, namelen);
 146        } else if (!strcmp(key, "fetchrecursesubmodules")) {
 147                char *name_cstr = xmemdupz(name, namelen);
 148                config = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name_cstr);
 149                if (!config)
 150                        config = string_list_append(&config_fetch_recurse_submodules_for_name, name_cstr);
 151                else
 152                        free(name_cstr);
 153                config->util = (void *)(intptr_t)parse_fetch_recurse_submodules_arg(var, value);
 154        } else if (!strcmp(key, "ignore")) {
 155                char *name_cstr;
 156
 157                if (!value)
 158                        return config_error_nonbool(var);
 159
 160                if (strcmp(value, "untracked") && strcmp(value, "dirty") &&
 161                    strcmp(value, "all") && strcmp(value, "none")) {
 162                        warning("Invalid parameter \"%s\" for config option \"submodule.%s.ignore\"", value, var);
 163                        return 0;
 164                }
 165
 166                name_cstr = xmemdupz(name, namelen);
 167                config = unsorted_string_list_lookup(&config_ignore_for_name, name_cstr);
 168                if (config) {
 169                        free(config->util);
 170                        free(name_cstr);
 171                } else
 172                        config = string_list_append(&config_ignore_for_name, name_cstr);
 173                config->util = xstrdup(value);
 174                return 0;
 175        }
 176        return 0;
 177}
 178
 179void handle_ignore_submodules_arg(struct diff_options *diffopt,
 180                                  const char *arg)
 181{
 182        DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
 183        DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 184        DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
 185
 186        if (!strcmp(arg, "all"))
 187                DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 188        else if (!strcmp(arg, "untracked"))
 189                DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 190        else if (!strcmp(arg, "dirty"))
 191                DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
 192        else if (strcmp(arg, "none"))
 193                die("bad --ignore-submodules argument: %s", arg);
 194}
 195
 196static int prepare_submodule_summary(struct rev_info *rev, const char *path,
 197                struct commit *left, struct commit *right,
 198                int *fast_forward, int *fast_backward)
 199{
 200        struct commit_list *merge_bases, *list;
 201
 202        init_revisions(rev, NULL);
 203        setup_revisions(0, NULL, rev, NULL);
 204        rev->left_right = 1;
 205        rev->first_parent_only = 1;
 206        left->object.flags |= SYMMETRIC_LEFT;
 207        add_pending_object(rev, &left->object, path);
 208        add_pending_object(rev, &right->object, path);
 209        merge_bases = get_merge_bases(left, right, 1);
 210        if (merge_bases) {
 211                if (merge_bases->item == left)
 212                        *fast_forward = 1;
 213                else if (merge_bases->item == right)
 214                        *fast_backward = 1;
 215        }
 216        for (list = merge_bases; list; list = list->next) {
 217                list->item->object.flags |= UNINTERESTING;
 218                add_pending_object(rev, &list->item->object,
 219                        sha1_to_hex(list->item->object.sha1));
 220        }
 221        return prepare_revision_walk(rev);
 222}
 223
 224static void print_submodule_summary(struct rev_info *rev, FILE *f,
 225                const char *line_prefix,
 226                const char *del, const char *add, const char *reset)
 227{
 228        static const char format[] = "  %m %s";
 229        struct strbuf sb = STRBUF_INIT;
 230        struct commit *commit;
 231
 232        while ((commit = get_revision(rev))) {
 233                struct pretty_print_context ctx = {0};
 234                ctx.date_mode = rev->date_mode;
 235                ctx.output_encoding = get_log_output_encoding();
 236                strbuf_setlen(&sb, 0);
 237                strbuf_addstr(&sb, line_prefix);
 238                if (commit->object.flags & SYMMETRIC_LEFT) {
 239                        if (del)
 240                                strbuf_addstr(&sb, del);
 241                }
 242                else if (add)
 243                        strbuf_addstr(&sb, add);
 244                format_commit_message(commit, format, &sb, &ctx);
 245                if (reset)
 246                        strbuf_addstr(&sb, reset);
 247                strbuf_addch(&sb, '\n');
 248                fprintf(f, "%s", sb.buf);
 249        }
 250        strbuf_release(&sb);
 251}
 252
 253int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
 254{
 255        switch (git_config_maybe_bool(opt, arg)) {
 256        case 1:
 257                return RECURSE_SUBMODULES_ON;
 258        case 0:
 259                return RECURSE_SUBMODULES_OFF;
 260        default:
 261                if (!strcmp(arg, "on-demand"))
 262                        return RECURSE_SUBMODULES_ON_DEMAND;
 263                die("bad %s argument: %s", opt, arg);
 264        }
 265}
 266
 267void show_submodule_summary(FILE *f, const char *path,
 268                const char *line_prefix,
 269                unsigned char one[20], unsigned char two[20],
 270                unsigned dirty_submodule, const char *meta,
 271                const char *del, const char *add, const char *reset)
 272{
 273        struct rev_info rev;
 274        struct commit *left = NULL, *right = NULL;
 275        const char *message = NULL;
 276        struct strbuf sb = STRBUF_INIT;
 277        int fast_forward = 0, fast_backward = 0;
 278
 279        if (is_null_sha1(two))
 280                message = "(submodule deleted)";
 281        else if (add_submodule_odb(path))
 282                message = "(not checked out)";
 283        else if (is_null_sha1(one))
 284                message = "(new submodule)";
 285        else if (!(left = lookup_commit_reference(one)) ||
 286                 !(right = lookup_commit_reference(two)))
 287                message = "(commits not present)";
 288        else if (prepare_submodule_summary(&rev, path, left, right,
 289                                           &fast_forward, &fast_backward))
 290                message = "(revision walker failed)";
 291
 292        if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
 293                fprintf(f, "%sSubmodule %s contains untracked content\n",
 294                        line_prefix, path);
 295        if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 296                fprintf(f, "%sSubmodule %s contains modified content\n",
 297                        line_prefix, path);
 298
 299        if (!hashcmp(one, two)) {
 300                strbuf_release(&sb);
 301                return;
 302        }
 303
 304        strbuf_addf(&sb, "%s%sSubmodule %s %s..", line_prefix, meta, path,
 305                        find_unique_abbrev(one, DEFAULT_ABBREV));
 306        if (!fast_backward && !fast_forward)
 307                strbuf_addch(&sb, '.');
 308        strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
 309        if (message)
 310                strbuf_addf(&sb, " %s%s\n", message, reset);
 311        else
 312                strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
 313        fwrite(sb.buf, sb.len, 1, f);
 314
 315        if (!message) /* only NULL if we succeeded in setting up the walk */
 316                print_submodule_summary(&rev, f, line_prefix, del, add, reset);
 317        if (left)
 318                clear_commit_marks(left, ~0);
 319        if (right)
 320                clear_commit_marks(right, ~0);
 321
 322        strbuf_release(&sb);
 323}
 324
 325void set_config_fetch_recurse_submodules(int value)
 326{
 327        config_fetch_recurse_submodules = value;
 328}
 329
 330static int has_remote(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 331{
 332        return 1;
 333}
 334
 335static int submodule_needs_pushing(const char *path, const unsigned char sha1[20])
 336{
 337        if (add_submodule_odb(path) || !lookup_commit_reference(sha1))
 338                return 0;
 339
 340        if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 341                struct child_process cp;
 342                const char *argv[] = {"rev-list", NULL, "--not", "--remotes", "-n", "1" , NULL};
 343                struct strbuf buf = STRBUF_INIT;
 344                int needs_pushing = 0;
 345
 346                argv[1] = sha1_to_hex(sha1);
 347                memset(&cp, 0, sizeof(cp));
 348                cp.argv = argv;
 349                cp.env = local_repo_env;
 350                cp.git_cmd = 1;
 351                cp.no_stdin = 1;
 352                cp.out = -1;
 353                cp.dir = path;
 354                if (start_command(&cp))
 355                        die("Could not run 'git rev-list %s --not --remotes -n 1' command in submodule %s",
 356                                sha1_to_hex(sha1), path);
 357                if (strbuf_read(&buf, cp.out, 41))
 358                        needs_pushing = 1;
 359                finish_command(&cp);
 360                close(cp.out);
 361                strbuf_release(&buf);
 362                return needs_pushing;
 363        }
 364
 365        return 0;
 366}
 367
 368static void collect_submodules_from_diff(struct diff_queue_struct *q,
 369                                         struct diff_options *options,
 370                                         void *data)
 371{
 372        int i;
 373        struct string_list *needs_pushing = data;
 374
 375        for (i = 0; i < q->nr; i++) {
 376                struct diff_filepair *p = q->queue[i];
 377                if (!S_ISGITLINK(p->two->mode))
 378                        continue;
 379                if (submodule_needs_pushing(p->two->path, p->two->sha1))
 380                        string_list_insert(needs_pushing, p->two->path);
 381        }
 382}
 383
 384static void find_unpushed_submodule_commits(struct commit *commit,
 385                struct string_list *needs_pushing)
 386{
 387        struct rev_info rev;
 388
 389        init_revisions(&rev, NULL);
 390        rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
 391        rev.diffopt.format_callback = collect_submodules_from_diff;
 392        rev.diffopt.format_callback_data = needs_pushing;
 393        diff_tree_combined_merge(commit, 1, &rev);
 394}
 395
 396int find_unpushed_submodules(unsigned char new_sha1[20],
 397                const char *remotes_name, struct string_list *needs_pushing)
 398{
 399        struct rev_info rev;
 400        struct commit *commit;
 401        const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
 402        int argc = ARRAY_SIZE(argv) - 1;
 403        char *sha1_copy;
 404
 405        struct strbuf remotes_arg = STRBUF_INIT;
 406
 407        strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
 408        init_revisions(&rev, NULL);
 409        sha1_copy = xstrdup(sha1_to_hex(new_sha1));
 410        argv[1] = sha1_copy;
 411        argv[3] = remotes_arg.buf;
 412        setup_revisions(argc, argv, &rev, NULL);
 413        if (prepare_revision_walk(&rev))
 414                die("revision walk setup failed");
 415
 416        while ((commit = get_revision(&rev)) != NULL)
 417                find_unpushed_submodule_commits(commit, needs_pushing);
 418
 419        reset_revision_walk();
 420        free(sha1_copy);
 421        strbuf_release(&remotes_arg);
 422
 423        return needs_pushing->nr;
 424}
 425
 426static int push_submodule(const char *path)
 427{
 428        if (add_submodule_odb(path))
 429                return 1;
 430
 431        if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 432                struct child_process cp;
 433                const char *argv[] = {"push", NULL};
 434
 435                memset(&cp, 0, sizeof(cp));
 436                cp.argv = argv;
 437                cp.env = local_repo_env;
 438                cp.git_cmd = 1;
 439                cp.no_stdin = 1;
 440                cp.dir = path;
 441                if (run_command(&cp))
 442                        return 0;
 443                close(cp.out);
 444        }
 445
 446        return 1;
 447}
 448
 449int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name)
 450{
 451        int i, ret = 1;
 452        struct string_list needs_pushing;
 453
 454        memset(&needs_pushing, 0, sizeof(struct string_list));
 455        needs_pushing.strdup_strings = 1;
 456
 457        if (!find_unpushed_submodules(new_sha1, remotes_name, &needs_pushing))
 458                return 1;
 459
 460        for (i = 0; i < needs_pushing.nr; i++) {
 461                const char *path = needs_pushing.items[i].string;
 462                fprintf(stderr, "Pushing submodule '%s'\n", path);
 463                if (!push_submodule(path)) {
 464                        fprintf(stderr, "Unable to push submodule '%s'\n", path);
 465                        ret = 0;
 466                }
 467        }
 468
 469        string_list_clear(&needs_pushing, 0);
 470
 471        return ret;
 472}
 473
 474static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
 475{
 476        int is_present = 0;
 477        if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
 478                /* Even if the submodule is checked out and the commit is
 479                 * present, make sure it is reachable from a ref. */
 480                struct child_process cp;
 481                const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
 482                struct strbuf buf = STRBUF_INIT;
 483
 484                argv[3] = sha1_to_hex(sha1);
 485                memset(&cp, 0, sizeof(cp));
 486                cp.argv = argv;
 487                cp.env = local_repo_env;
 488                cp.git_cmd = 1;
 489                cp.no_stdin = 1;
 490                cp.out = -1;
 491                cp.dir = path;
 492                if (!run_command(&cp) && !strbuf_read(&buf, cp.out, 1024))
 493                        is_present = 1;
 494
 495                close(cp.out);
 496                strbuf_release(&buf);
 497        }
 498        return is_present;
 499}
 500
 501static void submodule_collect_changed_cb(struct diff_queue_struct *q,
 502                                         struct diff_options *options,
 503                                         void *data)
 504{
 505        int i;
 506        for (i = 0; i < q->nr; i++) {
 507                struct diff_filepair *p = q->queue[i];
 508                if (!S_ISGITLINK(p->two->mode))
 509                        continue;
 510
 511                if (S_ISGITLINK(p->one->mode)) {
 512                        /* NEEDSWORK: We should honor the name configured in
 513                         * the .gitmodules file of the commit we are examining
 514                         * here to be able to correctly follow submodules
 515                         * being moved around. */
 516                        struct string_list_item *path;
 517                        path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
 518                        if (!path && !is_submodule_commit_present(p->two->path, p->two->sha1))
 519                                string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
 520                } else {
 521                        /* Submodule is new or was moved here */
 522                        /* NEEDSWORK: When the .git directories of submodules
 523                         * live inside the superprojects .git directory some
 524                         * day we should fetch new submodules directly into
 525                         * that location too when config or options request
 526                         * that so they can be checked out from there. */
 527                        continue;
 528                }
 529        }
 530}
 531
 532static int add_sha1_to_array(const char *ref, const unsigned char *sha1,
 533                             int flags, void *data)
 534{
 535        sha1_array_append(data, sha1);
 536        return 0;
 537}
 538
 539void check_for_new_submodule_commits(unsigned char new_sha1[20])
 540{
 541        if (!initialized_fetch_ref_tips) {
 542                for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
 543                initialized_fetch_ref_tips = 1;
 544        }
 545
 546        sha1_array_append(&ref_tips_after_fetch, new_sha1);
 547}
 548
 549static void add_sha1_to_argv(const unsigned char sha1[20], void *data)
 550{
 551        argv_array_push(data, sha1_to_hex(sha1));
 552}
 553
 554static void calculate_changed_submodule_paths(void)
 555{
 556        struct rev_info rev;
 557        struct commit *commit;
 558        struct argv_array argv = ARGV_ARRAY_INIT;
 559
 560        /* No need to check if there are no submodules configured */
 561        if (!config_name_for_path.nr)
 562                return;
 563
 564        init_revisions(&rev, NULL);
 565        argv_array_push(&argv, "--"); /* argv[0] program name */
 566        sha1_array_for_each_unique(&ref_tips_after_fetch,
 567                                   add_sha1_to_argv, &argv);
 568        argv_array_push(&argv, "--not");
 569        sha1_array_for_each_unique(&ref_tips_before_fetch,
 570                                   add_sha1_to_argv, &argv);
 571        setup_revisions(argv.argc, argv.argv, &rev, NULL);
 572        if (prepare_revision_walk(&rev))
 573                die("revision walk setup failed");
 574
 575        /*
 576         * Collect all submodules (whether checked out or not) for which new
 577         * commits have been recorded upstream in "changed_submodule_paths".
 578         */
 579        while ((commit = get_revision(&rev))) {
 580                struct commit_list *parent = commit->parents;
 581                while (parent) {
 582                        struct diff_options diff_opts;
 583                        diff_setup(&diff_opts);
 584                        DIFF_OPT_SET(&diff_opts, RECURSIVE);
 585                        diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
 586                        diff_opts.format_callback = submodule_collect_changed_cb;
 587                        diff_setup_done(&diff_opts);
 588                        diff_tree_sha1(parent->item->object.sha1, commit->object.sha1, "", &diff_opts);
 589                        diffcore_std(&diff_opts);
 590                        diff_flush(&diff_opts);
 591                        parent = parent->next;
 592                }
 593        }
 594
 595        argv_array_clear(&argv);
 596        sha1_array_clear(&ref_tips_before_fetch);
 597        sha1_array_clear(&ref_tips_after_fetch);
 598        initialized_fetch_ref_tips = 0;
 599}
 600
 601int fetch_populated_submodules(const struct argv_array *options,
 602                               const char *prefix, int command_line_option,
 603                               int quiet)
 604{
 605        int i, result = 0;
 606        struct child_process cp;
 607        struct argv_array argv = ARGV_ARRAY_INIT;
 608        struct string_list_item *name_for_path;
 609        const char *work_tree = get_git_work_tree();
 610        if (!work_tree)
 611                goto out;
 612
 613        if (read_cache() < 0)
 614                die("index file corrupt");
 615
 616        argv_array_push(&argv, "fetch");
 617        for (i = 0; i < options->argc; i++)
 618                argv_array_push(&argv, options->argv[i]);
 619        argv_array_push(&argv, "--recurse-submodules-default");
 620        /* default value, "--submodule-prefix" and its value are added later */
 621
 622        memset(&cp, 0, sizeof(cp));
 623        cp.env = local_repo_env;
 624        cp.git_cmd = 1;
 625        cp.no_stdin = 1;
 626
 627        calculate_changed_submodule_paths();
 628
 629        for (i = 0; i < active_nr; i++) {
 630                struct strbuf submodule_path = STRBUF_INIT;
 631                struct strbuf submodule_git_dir = STRBUF_INIT;
 632                struct strbuf submodule_prefix = STRBUF_INIT;
 633                const struct cache_entry *ce = active_cache[i];
 634                const char *git_dir, *name, *default_argv;
 635
 636                if (!S_ISGITLINK(ce->ce_mode))
 637                        continue;
 638
 639                name = ce->name;
 640                name_for_path = unsorted_string_list_lookup(&config_name_for_path, ce->name);
 641                if (name_for_path)
 642                        name = name_for_path->util;
 643
 644                default_argv = "yes";
 645                if (command_line_option == RECURSE_SUBMODULES_DEFAULT) {
 646                        struct string_list_item *fetch_recurse_submodules_option;
 647                        fetch_recurse_submodules_option = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name);
 648                        if (fetch_recurse_submodules_option) {
 649                                if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_OFF)
 650                                        continue;
 651                                if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_ON_DEMAND) {
 652                                        if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 653                                                continue;
 654                                        default_argv = "on-demand";
 655                                }
 656                        } else {
 657                                if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
 658                                    gitmodules_is_unmerged)
 659                                        continue;
 660                                if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
 661                                        if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 662                                                continue;
 663                                        default_argv = "on-demand";
 664                                }
 665                        }
 666                } else if (command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
 667                        if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 668                                continue;
 669                        default_argv = "on-demand";
 670                }
 671
 672                strbuf_addf(&submodule_path, "%s/%s", work_tree, ce->name);
 673                strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
 674                strbuf_addf(&submodule_prefix, "%s%s/", prefix, ce->name);
 675                git_dir = read_gitfile(submodule_git_dir.buf);
 676                if (!git_dir)
 677                        git_dir = submodule_git_dir.buf;
 678                if (is_directory(git_dir)) {
 679                        if (!quiet)
 680                                printf("Fetching submodule %s%s\n", prefix, ce->name);
 681                        cp.dir = submodule_path.buf;
 682                        argv_array_push(&argv, default_argv);
 683                        argv_array_push(&argv, "--submodule-prefix");
 684                        argv_array_push(&argv, submodule_prefix.buf);
 685                        cp.argv = argv.argv;
 686                        if (run_command(&cp))
 687                                result = 1;
 688                        argv_array_pop(&argv);
 689                        argv_array_pop(&argv);
 690                        argv_array_pop(&argv);
 691                }
 692                strbuf_release(&submodule_path);
 693                strbuf_release(&submodule_git_dir);
 694                strbuf_release(&submodule_prefix);
 695        }
 696        argv_array_clear(&argv);
 697out:
 698        string_list_clear(&changed_submodule_paths, 1);
 699        return result;
 700}
 701
 702unsigned is_submodule_modified(const char *path, int ignore_untracked)
 703{
 704        ssize_t len;
 705        struct child_process cp;
 706        const char *argv[] = {
 707                "status",
 708                "--porcelain",
 709                NULL,
 710                NULL,
 711        };
 712        struct strbuf buf = STRBUF_INIT;
 713        unsigned dirty_submodule = 0;
 714        const char *line, *next_line;
 715        const char *git_dir;
 716
 717        strbuf_addf(&buf, "%s/.git", path);
 718        git_dir = read_gitfile(buf.buf);
 719        if (!git_dir)
 720                git_dir = buf.buf;
 721        if (!is_directory(git_dir)) {
 722                strbuf_release(&buf);
 723                /* The submodule is not checked out, so it is not modified */
 724                return 0;
 725
 726        }
 727        strbuf_reset(&buf);
 728
 729        if (ignore_untracked)
 730                argv[2] = "-uno";
 731
 732        memset(&cp, 0, sizeof(cp));
 733        cp.argv = argv;
 734        cp.env = local_repo_env;
 735        cp.git_cmd = 1;
 736        cp.no_stdin = 1;
 737        cp.out = -1;
 738        cp.dir = path;
 739        if (start_command(&cp))
 740                die("Could not run 'git status --porcelain' in submodule %s", path);
 741
 742        len = strbuf_read(&buf, cp.out, 1024);
 743        line = buf.buf;
 744        while (len > 2) {
 745                if ((line[0] == '?') && (line[1] == '?')) {
 746                        dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
 747                        if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 748                                break;
 749                } else {
 750                        dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
 751                        if (ignore_untracked ||
 752                            (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
 753                                break;
 754                }
 755                next_line = strchr(line, '\n');
 756                if (!next_line)
 757                        break;
 758                next_line++;
 759                len -= (next_line - line);
 760                line = next_line;
 761        }
 762        close(cp.out);
 763
 764        if (finish_command(&cp))
 765                die("'git status --porcelain' failed in submodule %s", path);
 766
 767        strbuf_release(&buf);
 768        return dirty_submodule;
 769}
 770
 771int submodule_uses_gitfile(const char *path)
 772{
 773        struct child_process cp;
 774        const char *argv[] = {
 775                "submodule",
 776                "foreach",
 777                "--quiet",
 778                "--recursive",
 779                "test -f .git",
 780                NULL,
 781        };
 782        struct strbuf buf = STRBUF_INIT;
 783        const char *git_dir;
 784
 785        strbuf_addf(&buf, "%s/.git", path);
 786        git_dir = read_gitfile(buf.buf);
 787        if (!git_dir) {
 788                strbuf_release(&buf);
 789                return 0;
 790        }
 791        strbuf_release(&buf);
 792
 793        /* Now test that all nested submodules use a gitfile too */
 794        memset(&cp, 0, sizeof(cp));
 795        cp.argv = argv;
 796        cp.env = local_repo_env;
 797        cp.git_cmd = 1;
 798        cp.no_stdin = 1;
 799        cp.no_stderr = 1;
 800        cp.no_stdout = 1;
 801        cp.dir = path;
 802        if (run_command(&cp))
 803                return 0;
 804
 805        return 1;
 806}
 807
 808int ok_to_remove_submodule(const char *path)
 809{
 810        struct stat st;
 811        ssize_t len;
 812        struct child_process cp;
 813        const char *argv[] = {
 814                "status",
 815                "--porcelain",
 816                "-u",
 817                "--ignore-submodules=none",
 818                NULL,
 819        };
 820        struct strbuf buf = STRBUF_INIT;
 821        int ok_to_remove = 1;
 822
 823        if ((lstat(path, &st) < 0) || is_empty_dir(path))
 824                return 1;
 825
 826        if (!submodule_uses_gitfile(path))
 827                return 0;
 828
 829        memset(&cp, 0, sizeof(cp));
 830        cp.argv = argv;
 831        cp.env = local_repo_env;
 832        cp.git_cmd = 1;
 833        cp.no_stdin = 1;
 834        cp.out = -1;
 835        cp.dir = path;
 836        if (start_command(&cp))
 837                die("Could not run 'git status --porcelain -uall --ignore-submodules=none' in submodule %s", path);
 838
 839        len = strbuf_read(&buf, cp.out, 1024);
 840        if (len > 2)
 841                ok_to_remove = 0;
 842        close(cp.out);
 843
 844        if (finish_command(&cp))
 845                die("'git status --porcelain -uall --ignore-submodules=none' failed in submodule %s", path);
 846
 847        strbuf_release(&buf);
 848        return ok_to_remove;
 849}
 850
 851static int find_first_merges(struct object_array *result, const char *path,
 852                struct commit *a, struct commit *b)
 853{
 854        int i, j;
 855        struct object_array merges = OBJECT_ARRAY_INIT;
 856        struct commit *commit;
 857        int contains_another;
 858
 859        char merged_revision[42];
 860        const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
 861                                   "--all", merged_revision, NULL };
 862        struct rev_info revs;
 863        struct setup_revision_opt rev_opts;
 864
 865        memset(result, 0, sizeof(struct object_array));
 866        memset(&rev_opts, 0, sizeof(rev_opts));
 867
 868        /* get all revisions that merge commit a */
 869        snprintf(merged_revision, sizeof(merged_revision), "^%s",
 870                        sha1_to_hex(a->object.sha1));
 871        init_revisions(&revs, NULL);
 872        rev_opts.submodule = path;
 873        setup_revisions(sizeof(rev_args)/sizeof(char *)-1, rev_args, &revs, &rev_opts);
 874
 875        /* save all revisions from the above list that contain b */
 876        if (prepare_revision_walk(&revs))
 877                die("revision walk setup failed");
 878        while ((commit = get_revision(&revs)) != NULL) {
 879                struct object *o = &(commit->object);
 880                if (in_merge_bases(b, commit))
 881                        add_object_array(o, NULL, &merges);
 882        }
 883        reset_revision_walk();
 884
 885        /* Now we've got all merges that contain a and b. Prune all
 886         * merges that contain another found merge and save them in
 887         * result.
 888         */
 889        for (i = 0; i < merges.nr; i++) {
 890                struct commit *m1 = (struct commit *) merges.objects[i].item;
 891
 892                contains_another = 0;
 893                for (j = 0; j < merges.nr; j++) {
 894                        struct commit *m2 = (struct commit *) merges.objects[j].item;
 895                        if (i != j && in_merge_bases(m2, m1)) {
 896                                contains_another = 1;
 897                                break;
 898                        }
 899                }
 900
 901                if (!contains_another)
 902                        add_object_array(merges.objects[i].item, NULL, result);
 903        }
 904
 905        free(merges.objects);
 906        return result->nr;
 907}
 908
 909static void print_commit(struct commit *commit)
 910{
 911        struct strbuf sb = STRBUF_INIT;
 912        struct pretty_print_context ctx = {0};
 913        ctx.date_mode = DATE_NORMAL;
 914        format_commit_message(commit, " %h: %m %s", &sb, &ctx);
 915        fprintf(stderr, "%s\n", sb.buf);
 916        strbuf_release(&sb);
 917}
 918
 919#define MERGE_WARNING(path, msg) \
 920        warning("Failed to merge submodule %s (%s)", path, msg);
 921
 922int merge_submodule(unsigned char result[20], const char *path,
 923                    const unsigned char base[20], const unsigned char a[20],
 924                    const unsigned char b[20], int search)
 925{
 926        struct commit *commit_base, *commit_a, *commit_b;
 927        int parent_count;
 928        struct object_array merges;
 929
 930        int i;
 931
 932        /* store a in result in case we fail */
 933        hashcpy(result, a);
 934
 935        /* we can not handle deletion conflicts */
 936        if (is_null_sha1(base))
 937                return 0;
 938        if (is_null_sha1(a))
 939                return 0;
 940        if (is_null_sha1(b))
 941                return 0;
 942
 943        if (add_submodule_odb(path)) {
 944                MERGE_WARNING(path, "not checked out");
 945                return 0;
 946        }
 947
 948        if (!(commit_base = lookup_commit_reference(base)) ||
 949            !(commit_a = lookup_commit_reference(a)) ||
 950            !(commit_b = lookup_commit_reference(b))) {
 951                MERGE_WARNING(path, "commits not present");
 952                return 0;
 953        }
 954
 955        /* check whether both changes are forward */
 956        if (!in_merge_bases(commit_base, commit_a) ||
 957            !in_merge_bases(commit_base, commit_b)) {
 958                MERGE_WARNING(path, "commits don't follow merge-base");
 959                return 0;
 960        }
 961
 962        /* Case #1: a is contained in b or vice versa */
 963        if (in_merge_bases(commit_a, commit_b)) {
 964                hashcpy(result, b);
 965                return 1;
 966        }
 967        if (in_merge_bases(commit_b, commit_a)) {
 968                hashcpy(result, a);
 969                return 1;
 970        }
 971
 972        /*
 973         * Case #2: There are one or more merges that contain a and b in
 974         * the submodule. If there is only one, then present it as a
 975         * suggestion to the user, but leave it marked unmerged so the
 976         * user needs to confirm the resolution.
 977         */
 978
 979        /* Skip the search if makes no sense to the calling context.  */
 980        if (!search)
 981                return 0;
 982
 983        /* find commit which merges them */
 984        parent_count = find_first_merges(&merges, path, commit_a, commit_b);
 985        switch (parent_count) {
 986        case 0:
 987                MERGE_WARNING(path, "merge following commits not found");
 988                break;
 989
 990        case 1:
 991                MERGE_WARNING(path, "not fast-forward");
 992                fprintf(stderr, "Found a possible merge resolution "
 993                                "for the submodule:\n");
 994                print_commit((struct commit *) merges.objects[0].item);
 995                fprintf(stderr,
 996                        "If this is correct simply add it to the index "
 997                        "for example\n"
 998                        "by using:\n\n"
 999                        "  git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1000                        "which will accept this suggestion.\n",
1001                        sha1_to_hex(merges.objects[0].item->sha1), path);
1002                break;
1003
1004        default:
1005                MERGE_WARNING(path, "multiple merges found");
1006                for (i = 0; i < merges.nr; i++)
1007                        print_commit((struct commit *) merges.objects[i].item);
1008        }
1009
1010        free(merges.objects);
1011        return 0;
1012}