Andrew's git / gitweb.git / submodule.c
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submodule.con commit avoid segfault on submodule.*.path set to an empty "true" (4b05440)
   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 *del, const char *add, const char *reset)
 226{
 227        static const char format[] = "  %m %s";
 228        struct strbuf sb = STRBUF_INIT;
 229        struct commit *commit;
 230
 231        while ((commit = get_revision(rev))) {
 232                struct pretty_print_context ctx = {0};
 233                ctx.date_mode = rev->date_mode;
 234                strbuf_setlen(&sb, 0);
 235                if (commit->object.flags & SYMMETRIC_LEFT) {
 236                        if (del)
 237                                strbuf_addstr(&sb, del);
 238                }
 239                else if (add)
 240                        strbuf_addstr(&sb, add);
 241                format_commit_message(commit, format, &sb, &ctx);
 242                if (reset)
 243                        strbuf_addstr(&sb, reset);
 244                strbuf_addch(&sb, '\n');
 245                fprintf(f, "%s", sb.buf);
 246        }
 247        strbuf_release(&sb);
 248}
 249
 250int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
 251{
 252        switch (git_config_maybe_bool(opt, arg)) {
 253        case 1:
 254                return RECURSE_SUBMODULES_ON;
 255        case 0:
 256                return RECURSE_SUBMODULES_OFF;
 257        default:
 258                if (!strcmp(arg, "on-demand"))
 259                        return RECURSE_SUBMODULES_ON_DEMAND;
 260                die("bad %s argument: %s", opt, arg);
 261        }
 262}
 263
 264void show_submodule_summary(FILE *f, const char *path,
 265                unsigned char one[20], unsigned char two[20],
 266                unsigned dirty_submodule, const char *meta,
 267                const char *del, const char *add, const char *reset)
 268{
 269        struct rev_info rev;
 270        struct commit *left = NULL, *right = NULL;
 271        const char *message = NULL;
 272        struct strbuf sb = STRBUF_INIT;
 273        int fast_forward = 0, fast_backward = 0;
 274
 275        if (is_null_sha1(two))
 276                message = "(submodule deleted)";
 277        else if (add_submodule_odb(path))
 278                message = "(not checked out)";
 279        else if (is_null_sha1(one))
 280                message = "(new submodule)";
 281        else if (!(left = lookup_commit_reference(one)) ||
 282                 !(right = lookup_commit_reference(two)))
 283                message = "(commits not present)";
 284        else if (prepare_submodule_summary(&rev, path, left, right,
 285                                           &fast_forward, &fast_backward))
 286                message = "(revision walker failed)";
 287
 288        if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
 289                fprintf(f, "Submodule %s contains untracked content\n", path);
 290        if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 291                fprintf(f, "Submodule %s contains modified content\n", path);
 292
 293        if (!hashcmp(one, two)) {
 294                strbuf_release(&sb);
 295                return;
 296        }
 297
 298        strbuf_addf(&sb, "%sSubmodule %s %s..", meta, path,
 299                        find_unique_abbrev(one, DEFAULT_ABBREV));
 300        if (!fast_backward && !fast_forward)
 301                strbuf_addch(&sb, '.');
 302        strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
 303        if (message)
 304                strbuf_addf(&sb, " %s%s\n", message, reset);
 305        else
 306                strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
 307        fwrite(sb.buf, sb.len, 1, f);
 308
 309        if (!message) /* only NULL if we succeeded in setting up the walk */
 310                print_submodule_summary(&rev, f, del, add, reset);
 311        if (left)
 312                clear_commit_marks(left, ~0);
 313        if (right)
 314                clear_commit_marks(right, ~0);
 315
 316        strbuf_release(&sb);
 317}
 318
 319void set_config_fetch_recurse_submodules(int value)
 320{
 321        config_fetch_recurse_submodules = value;
 322}
 323
 324static int has_remote(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 325{
 326        return 1;
 327}
 328
 329static int submodule_needs_pushing(const char *path, const unsigned char sha1[20])
 330{
 331        if (add_submodule_odb(path) || !lookup_commit_reference(sha1))
 332                return 0;
 333
 334        if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 335                struct child_process cp;
 336                const char *argv[] = {"rev-list", NULL, "--not", "--remotes", "-n", "1" , NULL};
 337                struct strbuf buf = STRBUF_INIT;
 338                int needs_pushing = 0;
 339
 340                argv[1] = sha1_to_hex(sha1);
 341                memset(&cp, 0, sizeof(cp));
 342                cp.argv = argv;
 343                cp.env = local_repo_env;
 344                cp.git_cmd = 1;
 345                cp.no_stdin = 1;
 346                cp.out = -1;
 347                cp.dir = path;
 348                if (start_command(&cp))
 349                        die("Could not run 'git rev-list %s --not --remotes -n 1' command in submodule %s",
 350                                sha1_to_hex(sha1), path);
 351                if (strbuf_read(&buf, cp.out, 41))
 352                        needs_pushing = 1;
 353                finish_command(&cp);
 354                close(cp.out);
 355                strbuf_release(&buf);
 356                return needs_pushing;
 357        }
 358
 359        return 0;
 360}
 361
 362static void collect_submodules_from_diff(struct diff_queue_struct *q,
 363                                         struct diff_options *options,
 364                                         void *data)
 365{
 366        int i;
 367        struct string_list *needs_pushing = data;
 368
 369        for (i = 0; i < q->nr; i++) {
 370                struct diff_filepair *p = q->queue[i];
 371                if (!S_ISGITLINK(p->two->mode))
 372                        continue;
 373                if (submodule_needs_pushing(p->two->path, p->two->sha1))
 374                        string_list_insert(needs_pushing, p->two->path);
 375        }
 376}
 377
 378static void find_unpushed_submodule_commits(struct commit *commit,
 379                struct string_list *needs_pushing)
 380{
 381        struct rev_info rev;
 382
 383        init_revisions(&rev, NULL);
 384        rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
 385        rev.diffopt.format_callback = collect_submodules_from_diff;
 386        rev.diffopt.format_callback_data = needs_pushing;
 387        diff_tree_combined_merge(commit, 1, &rev);
 388}
 389
 390int find_unpushed_submodules(unsigned char new_sha1[20],
 391                const char *remotes_name, struct string_list *needs_pushing)
 392{
 393        struct rev_info rev;
 394        struct commit *commit;
 395        const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
 396        int argc = ARRAY_SIZE(argv) - 1;
 397        char *sha1_copy;
 398
 399        struct strbuf remotes_arg = STRBUF_INIT;
 400
 401        strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
 402        init_revisions(&rev, NULL);
 403        sha1_copy = xstrdup(sha1_to_hex(new_sha1));
 404        argv[1] = sha1_copy;
 405        argv[3] = remotes_arg.buf;
 406        setup_revisions(argc, argv, &rev, NULL);
 407        if (prepare_revision_walk(&rev))
 408                die("revision walk setup failed");
 409
 410        while ((commit = get_revision(&rev)) != NULL)
 411                find_unpushed_submodule_commits(commit, needs_pushing);
 412
 413        reset_revision_walk();
 414        free(sha1_copy);
 415        strbuf_release(&remotes_arg);
 416
 417        return needs_pushing->nr;
 418}
 419
 420static int push_submodule(const char *path)
 421{
 422        if (add_submodule_odb(path))
 423                return 1;
 424
 425        if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
 426                struct child_process cp;
 427                const char *argv[] = {"push", NULL};
 428
 429                memset(&cp, 0, sizeof(cp));
 430                cp.argv = argv;
 431                cp.env = local_repo_env;
 432                cp.git_cmd = 1;
 433                cp.no_stdin = 1;
 434                cp.dir = path;
 435                if (run_command(&cp))
 436                        return 0;
 437                close(cp.out);
 438        }
 439
 440        return 1;
 441}
 442
 443int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name)
 444{
 445        int i, ret = 1;
 446        struct string_list needs_pushing;
 447
 448        memset(&needs_pushing, 0, sizeof(struct string_list));
 449        needs_pushing.strdup_strings = 1;
 450
 451        if (!find_unpushed_submodules(new_sha1, remotes_name, &needs_pushing))
 452                return 1;
 453
 454        for (i = 0; i < needs_pushing.nr; i++) {
 455                const char *path = needs_pushing.items[i].string;
 456                fprintf(stderr, "Pushing submodule '%s'\n", path);
 457                if (!push_submodule(path)) {
 458                        fprintf(stderr, "Unable to push submodule '%s'\n", path);
 459                        ret = 0;
 460                }
 461        }
 462
 463        string_list_clear(&needs_pushing, 0);
 464
 465        return ret;
 466}
 467
 468static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
 469{
 470        int is_present = 0;
 471        if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
 472                /* Even if the submodule is checked out and the commit is
 473                 * present, make sure it is reachable from a ref. */
 474                struct child_process cp;
 475                const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
 476                struct strbuf buf = STRBUF_INIT;
 477
 478                argv[3] = sha1_to_hex(sha1);
 479                memset(&cp, 0, sizeof(cp));
 480                cp.argv = argv;
 481                cp.env = local_repo_env;
 482                cp.git_cmd = 1;
 483                cp.no_stdin = 1;
 484                cp.out = -1;
 485                cp.dir = path;
 486                if (!run_command(&cp) && !strbuf_read(&buf, cp.out, 1024))
 487                        is_present = 1;
 488
 489                close(cp.out);
 490                strbuf_release(&buf);
 491        }
 492        return is_present;
 493}
 494
 495static void submodule_collect_changed_cb(struct diff_queue_struct *q,
 496                                         struct diff_options *options,
 497                                         void *data)
 498{
 499        int i;
 500        for (i = 0; i < q->nr; i++) {
 501                struct diff_filepair *p = q->queue[i];
 502                if (!S_ISGITLINK(p->two->mode))
 503                        continue;
 504
 505                if (S_ISGITLINK(p->one->mode)) {
 506                        /* NEEDSWORK: We should honor the name configured in
 507                         * the .gitmodules file of the commit we are examining
 508                         * here to be able to correctly follow submodules
 509                         * being moved around. */
 510                        struct string_list_item *path;
 511                        path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
 512                        if (!path && !is_submodule_commit_present(p->two->path, p->two->sha1))
 513                                string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
 514                } else {
 515                        /* Submodule is new or was moved here */
 516                        /* NEEDSWORK: When the .git directories of submodules
 517                         * live inside the superprojects .git directory some
 518                         * day we should fetch new submodules directly into
 519                         * that location too when config or options request
 520                         * that so they can be checked out from there. */
 521                        continue;
 522                }
 523        }
 524}
 525
 526static int add_sha1_to_array(const char *ref, const unsigned char *sha1,
 527                             int flags, void *data)
 528{
 529        sha1_array_append(data, sha1);
 530        return 0;
 531}
 532
 533void check_for_new_submodule_commits(unsigned char new_sha1[20])
 534{
 535        if (!initialized_fetch_ref_tips) {
 536                for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
 537                initialized_fetch_ref_tips = 1;
 538        }
 539
 540        sha1_array_append(&ref_tips_after_fetch, new_sha1);
 541}
 542
 543static void add_sha1_to_argv(const unsigned char sha1[20], void *data)
 544{
 545        argv_array_push(data, sha1_to_hex(sha1));
 546}
 547
 548static void calculate_changed_submodule_paths(void)
 549{
 550        struct rev_info rev;
 551        struct commit *commit;
 552        struct argv_array argv = ARGV_ARRAY_INIT;
 553
 554        /* No need to check if there are no submodules configured */
 555        if (!config_name_for_path.nr)
 556                return;
 557
 558        init_revisions(&rev, NULL);
 559        argv_array_push(&argv, "--"); /* argv[0] program name */
 560        sha1_array_for_each_unique(&ref_tips_after_fetch,
 561                                   add_sha1_to_argv, &argv);
 562        argv_array_push(&argv, "--not");
 563        sha1_array_for_each_unique(&ref_tips_before_fetch,
 564                                   add_sha1_to_argv, &argv);
 565        setup_revisions(argv.argc, argv.argv, &rev, NULL);
 566        if (prepare_revision_walk(&rev))
 567                die("revision walk setup failed");
 568
 569        /*
 570         * Collect all submodules (whether checked out or not) for which new
 571         * commits have been recorded upstream in "changed_submodule_paths".
 572         */
 573        while ((commit = get_revision(&rev))) {
 574                struct commit_list *parent = commit->parents;
 575                while (parent) {
 576                        struct diff_options diff_opts;
 577                        diff_setup(&diff_opts);
 578                        DIFF_OPT_SET(&diff_opts, RECURSIVE);
 579                        diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
 580                        diff_opts.format_callback = submodule_collect_changed_cb;
 581                        diff_setup_done(&diff_opts);
 582                        diff_tree_sha1(parent->item->object.sha1, commit->object.sha1, "", &diff_opts);
 583                        diffcore_std(&diff_opts);
 584                        diff_flush(&diff_opts);
 585                        parent = parent->next;
 586                }
 587        }
 588
 589        argv_array_clear(&argv);
 590        sha1_array_clear(&ref_tips_before_fetch);
 591        sha1_array_clear(&ref_tips_after_fetch);
 592        initialized_fetch_ref_tips = 0;
 593}
 594
 595int fetch_populated_submodules(const struct argv_array *options,
 596                               const char *prefix, int command_line_option,
 597                               int quiet)
 598{
 599        int i, result = 0;
 600        struct child_process cp;
 601        struct argv_array argv = ARGV_ARRAY_INIT;
 602        struct string_list_item *name_for_path;
 603        const char *work_tree = get_git_work_tree();
 604        if (!work_tree)
 605                goto out;
 606
 607        if (!the_index.initialized)
 608                if (read_cache() < 0)
 609                        die("index file corrupt");
 610
 611        argv_array_push(&argv, "fetch");
 612        for (i = 0; i < options->argc; i++)
 613                argv_array_push(&argv, options->argv[i]);
 614        argv_array_push(&argv, "--recurse-submodules-default");
 615        /* default value, "--submodule-prefix" and its value are added later */
 616
 617        memset(&cp, 0, sizeof(cp));
 618        cp.env = local_repo_env;
 619        cp.git_cmd = 1;
 620        cp.no_stdin = 1;
 621
 622        calculate_changed_submodule_paths();
 623
 624        for (i = 0; i < active_nr; i++) {
 625                struct strbuf submodule_path = STRBUF_INIT;
 626                struct strbuf submodule_git_dir = STRBUF_INIT;
 627                struct strbuf submodule_prefix = STRBUF_INIT;
 628                struct cache_entry *ce = active_cache[i];
 629                const char *git_dir, *name, *default_argv;
 630
 631                if (!S_ISGITLINK(ce->ce_mode))
 632                        continue;
 633
 634                name = ce->name;
 635                name_for_path = unsorted_string_list_lookup(&config_name_for_path, ce->name);
 636                if (name_for_path)
 637                        name = name_for_path->util;
 638
 639                default_argv = "yes";
 640                if (command_line_option == RECURSE_SUBMODULES_DEFAULT) {
 641                        struct string_list_item *fetch_recurse_submodules_option;
 642                        fetch_recurse_submodules_option = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name);
 643                        if (fetch_recurse_submodules_option) {
 644                                if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_OFF)
 645                                        continue;
 646                                if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_ON_DEMAND) {
 647                                        if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 648                                                continue;
 649                                        default_argv = "on-demand";
 650                                }
 651                        } else {
 652                                if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
 653                                    gitmodules_is_unmerged)
 654                                        continue;
 655                                if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
 656                                        if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 657                                                continue;
 658                                        default_argv = "on-demand";
 659                                }
 660                        }
 661                } else if (command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
 662                        if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
 663                                continue;
 664                        default_argv = "on-demand";
 665                }
 666
 667                strbuf_addf(&submodule_path, "%s/%s", work_tree, ce->name);
 668                strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
 669                strbuf_addf(&submodule_prefix, "%s%s/", prefix, ce->name);
 670                git_dir = read_gitfile(submodule_git_dir.buf);
 671                if (!git_dir)
 672                        git_dir = submodule_git_dir.buf;
 673                if (is_directory(git_dir)) {
 674                        if (!quiet)
 675                                printf("Fetching submodule %s%s\n", prefix, ce->name);
 676                        cp.dir = submodule_path.buf;
 677                        argv_array_push(&argv, default_argv);
 678                        argv_array_push(&argv, "--submodule-prefix");
 679                        argv_array_push(&argv, submodule_prefix.buf);
 680                        cp.argv = argv.argv;
 681                        if (run_command(&cp))
 682                                result = 1;
 683                        argv_array_pop(&argv);
 684                        argv_array_pop(&argv);
 685                        argv_array_pop(&argv);
 686                }
 687                strbuf_release(&submodule_path);
 688                strbuf_release(&submodule_git_dir);
 689                strbuf_release(&submodule_prefix);
 690        }
 691        argv_array_clear(&argv);
 692out:
 693        string_list_clear(&changed_submodule_paths, 1);
 694        return result;
 695}
 696
 697unsigned is_submodule_modified(const char *path, int ignore_untracked)
 698{
 699        ssize_t len;
 700        struct child_process cp;
 701        const char *argv[] = {
 702                "status",
 703                "--porcelain",
 704                NULL,
 705                NULL,
 706        };
 707        struct strbuf buf = STRBUF_INIT;
 708        unsigned dirty_submodule = 0;
 709        const char *line, *next_line;
 710        const char *git_dir;
 711
 712        strbuf_addf(&buf, "%s/.git", path);
 713        git_dir = read_gitfile(buf.buf);
 714        if (!git_dir)
 715                git_dir = buf.buf;
 716        if (!is_directory(git_dir)) {
 717                strbuf_release(&buf);
 718                /* The submodule is not checked out, so it is not modified */
 719                return 0;
 720
 721        }
 722        strbuf_reset(&buf);
 723
 724        if (ignore_untracked)
 725                argv[2] = "-uno";
 726
 727        memset(&cp, 0, sizeof(cp));
 728        cp.argv = argv;
 729        cp.env = local_repo_env;
 730        cp.git_cmd = 1;
 731        cp.no_stdin = 1;
 732        cp.out = -1;
 733        cp.dir = path;
 734        if (start_command(&cp))
 735                die("Could not run 'git status --porcelain' in submodule %s", path);
 736
 737        len = strbuf_read(&buf, cp.out, 1024);
 738        line = buf.buf;
 739        while (len > 2) {
 740                if ((line[0] == '?') && (line[1] == '?')) {
 741                        dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
 742                        if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 743                                break;
 744                } else {
 745                        dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
 746                        if (ignore_untracked ||
 747                            (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
 748                                break;
 749                }
 750                next_line = strchr(line, '\n');
 751                if (!next_line)
 752                        break;
 753                next_line++;
 754                len -= (next_line - line);
 755                line = next_line;
 756        }
 757        close(cp.out);
 758
 759        if (finish_command(&cp))
 760                die("'git status --porcelain' failed in submodule %s", path);
 761
 762        strbuf_release(&buf);
 763        return dirty_submodule;
 764}
 765
 766int submodule_uses_gitfile(const char *path)
 767{
 768        struct child_process cp;
 769        const char *argv[] = {
 770                "submodule",
 771                "foreach",
 772                "--quiet",
 773                "--recursive",
 774                "test -f .git",
 775                NULL,
 776        };
 777        struct strbuf buf = STRBUF_INIT;
 778        const char *git_dir;
 779
 780        strbuf_addf(&buf, "%s/.git", path);
 781        git_dir = read_gitfile(buf.buf);
 782        if (!git_dir) {
 783                strbuf_release(&buf);
 784                return 0;
 785        }
 786        strbuf_release(&buf);
 787
 788        /* Now test that all nested submodules use a gitfile too */
 789        memset(&cp, 0, sizeof(cp));
 790        cp.argv = argv;
 791        cp.env = local_repo_env;
 792        cp.git_cmd = 1;
 793        cp.no_stdin = 1;
 794        cp.no_stderr = 1;
 795        cp.no_stdout = 1;
 796        cp.dir = path;
 797        if (run_command(&cp))
 798                return 0;
 799
 800        return 1;
 801}
 802
 803int ok_to_remove_submodule(const char *path)
 804{
 805        struct stat st;
 806        ssize_t len;
 807        struct child_process cp;
 808        const char *argv[] = {
 809                "status",
 810                "--porcelain",
 811                "-u",
 812                "--ignore-submodules=none",
 813                NULL,
 814        };
 815        struct strbuf buf = STRBUF_INIT;
 816        int ok_to_remove = 1;
 817
 818        if ((lstat(path, &st) < 0) || is_empty_dir(path))
 819                return 1;
 820
 821        if (!submodule_uses_gitfile(path))
 822                return 0;
 823
 824        memset(&cp, 0, sizeof(cp));
 825        cp.argv = argv;
 826        cp.env = local_repo_env;
 827        cp.git_cmd = 1;
 828        cp.no_stdin = 1;
 829        cp.out = -1;
 830        cp.dir = path;
 831        if (start_command(&cp))
 832                die("Could not run 'git status --porcelain -uall --ignore-submodules=none' in submodule %s", path);
 833
 834        len = strbuf_read(&buf, cp.out, 1024);
 835        if (len > 2)
 836                ok_to_remove = 0;
 837        close(cp.out);
 838
 839        if (finish_command(&cp))
 840                die("'git status --porcelain -uall --ignore-submodules=none' failed in submodule %s", path);
 841
 842        strbuf_release(&buf);
 843        return ok_to_remove;
 844}
 845
 846static int find_first_merges(struct object_array *result, const char *path,
 847                struct commit *a, struct commit *b)
 848{
 849        int i, j;
 850        struct object_array merges;
 851        struct commit *commit;
 852        int contains_another;
 853
 854        char merged_revision[42];
 855        const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
 856                                   "--all", merged_revision, NULL };
 857        struct rev_info revs;
 858        struct setup_revision_opt rev_opts;
 859
 860        memset(&merges, 0, sizeof(merges));
 861        memset(result, 0, sizeof(struct object_array));
 862        memset(&rev_opts, 0, sizeof(rev_opts));
 863
 864        /* get all revisions that merge commit a */
 865        snprintf(merged_revision, sizeof(merged_revision), "^%s",
 866                        sha1_to_hex(a->object.sha1));
 867        init_revisions(&revs, NULL);
 868        rev_opts.submodule = path;
 869        setup_revisions(sizeof(rev_args)/sizeof(char *)-1, rev_args, &revs, &rev_opts);
 870
 871        /* save all revisions from the above list that contain b */
 872        if (prepare_revision_walk(&revs))
 873                die("revision walk setup failed");
 874        while ((commit = get_revision(&revs)) != NULL) {
 875                struct object *o = &(commit->object);
 876                if (in_merge_bases(b, commit))
 877                        add_object_array(o, NULL, &merges);
 878        }
 879        reset_revision_walk();
 880
 881        /* Now we've got all merges that contain a and b. Prune all
 882         * merges that contain another found merge and save them in
 883         * result.
 884         */
 885        for (i = 0; i < merges.nr; i++) {
 886                struct commit *m1 = (struct commit *) merges.objects[i].item;
 887
 888                contains_another = 0;
 889                for (j = 0; j < merges.nr; j++) {
 890                        struct commit *m2 = (struct commit *) merges.objects[j].item;
 891                        if (i != j && in_merge_bases(m2, m1)) {
 892                                contains_another = 1;
 893                                break;
 894                        }
 895                }
 896
 897                if (!contains_another)
 898                        add_object_array(merges.objects[i].item,
 899                                         merges.objects[i].name, result);
 900        }
 901
 902        free(merges.objects);
 903        return result->nr;
 904}
 905
 906static void print_commit(struct commit *commit)
 907{
 908        struct strbuf sb = STRBUF_INIT;
 909        struct pretty_print_context ctx = {0};
 910        ctx.date_mode = DATE_NORMAL;
 911        format_commit_message(commit, " %h: %m %s", &sb, &ctx);
 912        fprintf(stderr, "%s\n", sb.buf);
 913        strbuf_release(&sb);
 914}
 915
 916#define MERGE_WARNING(path, msg) \
 917        warning("Failed to merge submodule %s (%s)", path, msg);
 918
 919int merge_submodule(unsigned char result[20], const char *path,
 920                    const unsigned char base[20], const unsigned char a[20],
 921                    const unsigned char b[20], int search)
 922{
 923        struct commit *commit_base, *commit_a, *commit_b;
 924        int parent_count;
 925        struct object_array merges;
 926
 927        int i;
 928
 929        /* store a in result in case we fail */
 930        hashcpy(result, a);
 931
 932        /* we can not handle deletion conflicts */
 933        if (is_null_sha1(base))
 934                return 0;
 935        if (is_null_sha1(a))
 936                return 0;
 937        if (is_null_sha1(b))
 938                return 0;
 939
 940        if (add_submodule_odb(path)) {
 941                MERGE_WARNING(path, "not checked out");
 942                return 0;
 943        }
 944
 945        if (!(commit_base = lookup_commit_reference(base)) ||
 946            !(commit_a = lookup_commit_reference(a)) ||
 947            !(commit_b = lookup_commit_reference(b))) {
 948                MERGE_WARNING(path, "commits not present");
 949                return 0;
 950        }
 951
 952        /* check whether both changes are forward */
 953        if (!in_merge_bases(commit_base, commit_a) ||
 954            !in_merge_bases(commit_base, commit_b)) {
 955                MERGE_WARNING(path, "commits don't follow merge-base");
 956                return 0;
 957        }
 958
 959        /* Case #1: a is contained in b or vice versa */
 960        if (in_merge_bases(commit_a, commit_b)) {
 961                hashcpy(result, b);
 962                return 1;
 963        }
 964        if (in_merge_bases(commit_b, commit_a)) {
 965                hashcpy(result, a);
 966                return 1;
 967        }
 968
 969        /*
 970         * Case #2: There are one or more merges that contain a and b in
 971         * the submodule. If there is only one, then present it as a
 972         * suggestion to the user, but leave it marked unmerged so the
 973         * user needs to confirm the resolution.
 974         */
 975
 976        /* Skip the search if makes no sense to the calling context.  */
 977        if (!search)
 978                return 0;
 979
 980        /* find commit which merges them */
 981        parent_count = find_first_merges(&merges, path, commit_a, commit_b);
 982        switch (parent_count) {
 983        case 0:
 984                MERGE_WARNING(path, "merge following commits not found");
 985                break;
 986
 987        case 1:
 988                MERGE_WARNING(path, "not fast-forward");
 989                fprintf(stderr, "Found a possible merge resolution "
 990                                "for the submodule:\n");
 991                print_commit((struct commit *) merges.objects[0].item);
 992                fprintf(stderr,
 993                        "If this is correct simply add it to the index "
 994                        "for example\n"
 995                        "by using:\n\n"
 996                        "  git update-index --cacheinfo 160000 %s \"%s\"\n\n"
 997                        "which will accept this suggestion.\n",
 998                        sha1_to_hex(merges.objects[0].item->sha1), path);
 999                break;
1000
1001        default:
1002                MERGE_WARNING(path, "multiple merges found");
1003                for (i = 0; i < merges.nr; i++)
1004                        print_commit((struct commit *) merges.objects[i].item);
1005        }
1006
1007        free(merges.objects);
1008        return 0;
1009}