Andrew's git / gitweb.git / submodule.c
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submodule.con commit tag: recognize rfc1991 signatures (3d5854e)
   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
  12struct string_list config_name_for_path;
  13struct string_list config_ignore_for_name;
  14
  15static int add_submodule_odb(const char *path)
  16{
  17        struct strbuf objects_directory = STRBUF_INIT;
  18        struct alternate_object_database *alt_odb;
  19        int ret = 0;
  20        const char *git_dir;
  21
  22        strbuf_addf(&objects_directory, "%s/.git", path);
  23        git_dir = read_gitfile_gently(objects_directory.buf);
  24        if (git_dir) {
  25                strbuf_reset(&objects_directory);
  26                strbuf_addstr(&objects_directory, git_dir);
  27        }
  28        strbuf_addstr(&objects_directory, "/objects/");
  29        if (!is_directory(objects_directory.buf)) {
  30                ret = -1;
  31                goto done;
  32        }
  33        /* avoid adding it twice */
  34        for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
  35                if (alt_odb->name - alt_odb->base == objects_directory.len &&
  36                                !strncmp(alt_odb->base, objects_directory.buf,
  37                                        objects_directory.len))
  38                        goto done;
  39
  40        alt_odb = xmalloc(objects_directory.len + 42 + sizeof(*alt_odb));
  41        alt_odb->next = alt_odb_list;
  42        strcpy(alt_odb->base, objects_directory.buf);
  43        alt_odb->name = alt_odb->base + objects_directory.len;
  44        alt_odb->name[2] = '/';
  45        alt_odb->name[40] = '\0';
  46        alt_odb->name[41] = '\0';
  47        alt_odb_list = alt_odb;
  48        prepare_alt_odb();
  49done:
  50        strbuf_release(&objects_directory);
  51        return ret;
  52}
  53
  54void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
  55                                             const char *path)
  56{
  57        struct string_list_item *path_option, *ignore_option;
  58        path_option = unsorted_string_list_lookup(&config_name_for_path, path);
  59        if (path_option) {
  60                ignore_option = unsorted_string_list_lookup(&config_ignore_for_name, path_option->util);
  61                if (ignore_option)
  62                        handle_ignore_submodules_arg(diffopt, ignore_option->util);
  63        }
  64}
  65
  66static int submodule_config(const char *var, const char *value, void *cb)
  67{
  68        if (!prefixcmp(var, "submodule."))
  69                return parse_submodule_config_option(var, value);
  70        return 0;
  71}
  72
  73void gitmodules_config(void)
  74{
  75        const char *work_tree = get_git_work_tree();
  76        if (work_tree) {
  77                struct strbuf gitmodules_path = STRBUF_INIT;
  78                strbuf_addstr(&gitmodules_path, work_tree);
  79                strbuf_addstr(&gitmodules_path, "/.gitmodules");
  80                git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
  81                strbuf_release(&gitmodules_path);
  82        }
  83}
  84
  85int parse_submodule_config_option(const char *var, const char *value)
  86{
  87        int len;
  88        struct string_list_item *config;
  89        struct strbuf submodname = STRBUF_INIT;
  90
  91        var += 10;              /* Skip "submodule." */
  92
  93        len = strlen(var);
  94        if ((len > 5) && !strcmp(var + len - 5, ".path")) {
  95                strbuf_add(&submodname, var, len - 5);
  96                config = unsorted_string_list_lookup(&config_name_for_path, value);
  97                if (config)
  98                        free(config->util);
  99                else
 100                        config = string_list_append(&config_name_for_path, xstrdup(value));
 101                config->util = strbuf_detach(&submodname, NULL);
 102                strbuf_release(&submodname);
 103        } else if ((len > 7) && !strcmp(var + len - 7, ".ignore")) {
 104                if (strcmp(value, "untracked") && strcmp(value, "dirty") &&
 105                    strcmp(value, "all") && strcmp(value, "none")) {
 106                        warning("Invalid parameter \"%s\" for config option \"submodule.%s.ignore\"", value, var);
 107                        return 0;
 108                }
 109
 110                strbuf_add(&submodname, var, len - 7);
 111                config = unsorted_string_list_lookup(&config_ignore_for_name, submodname.buf);
 112                if (config)
 113                        free(config->util);
 114                else
 115                        config = string_list_append(&config_ignore_for_name,
 116                                                    strbuf_detach(&submodname, NULL));
 117                strbuf_release(&submodname);
 118                config->util = xstrdup(value);
 119                return 0;
 120        }
 121        return 0;
 122}
 123
 124void handle_ignore_submodules_arg(struct diff_options *diffopt,
 125                                  const char *arg)
 126{
 127        DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
 128        DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 129        DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
 130
 131        if (!strcmp(arg, "all"))
 132                DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 133        else if (!strcmp(arg, "untracked"))
 134                DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 135        else if (!strcmp(arg, "dirty"))
 136                DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
 137        else if (strcmp(arg, "none"))
 138                die("bad --ignore-submodules argument: %s", arg);
 139}
 140
 141void show_submodule_summary(FILE *f, const char *path,
 142                unsigned char one[20], unsigned char two[20],
 143                unsigned dirty_submodule,
 144                const char *del, const char *add, const char *reset)
 145{
 146        struct rev_info rev;
 147        struct commit *commit, *left = left, *right = right;
 148        struct commit_list *merge_bases, *list;
 149        const char *message = NULL;
 150        struct strbuf sb = STRBUF_INIT;
 151        static const char *format = "  %m %s";
 152        int fast_forward = 0, fast_backward = 0;
 153
 154        if (is_null_sha1(two))
 155                message = "(submodule deleted)";
 156        else if (add_submodule_odb(path))
 157                message = "(not checked out)";
 158        else if (is_null_sha1(one))
 159                message = "(new submodule)";
 160        else if (!(left = lookup_commit_reference(one)) ||
 161                 !(right = lookup_commit_reference(two)))
 162                message = "(commits not present)";
 163
 164        if (!message) {
 165                init_revisions(&rev, NULL);
 166                setup_revisions(0, NULL, &rev, NULL);
 167                rev.left_right = 1;
 168                rev.first_parent_only = 1;
 169                left->object.flags |= SYMMETRIC_LEFT;
 170                add_pending_object(&rev, &left->object, path);
 171                add_pending_object(&rev, &right->object, path);
 172                merge_bases = get_merge_bases(left, right, 1);
 173                if (merge_bases) {
 174                        if (merge_bases->item == left)
 175                                fast_forward = 1;
 176                        else if (merge_bases->item == right)
 177                                fast_backward = 1;
 178                }
 179                for (list = merge_bases; list; list = list->next) {
 180                        list->item->object.flags |= UNINTERESTING;
 181                        add_pending_object(&rev, &list->item->object,
 182                                sha1_to_hex(list->item->object.sha1));
 183                }
 184                if (prepare_revision_walk(&rev))
 185                        message = "(revision walker failed)";
 186        }
 187
 188        if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
 189                fprintf(f, "Submodule %s contains untracked content\n", path);
 190        if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 191                fprintf(f, "Submodule %s contains modified content\n", path);
 192
 193        if (!hashcmp(one, two)) {
 194                strbuf_release(&sb);
 195                return;
 196        }
 197
 198        strbuf_addf(&sb, "Submodule %s %s..", path,
 199                        find_unique_abbrev(one, DEFAULT_ABBREV));
 200        if (!fast_backward && !fast_forward)
 201                strbuf_addch(&sb, '.');
 202        strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
 203        if (message)
 204                strbuf_addf(&sb, " %s\n", message);
 205        else
 206                strbuf_addf(&sb, "%s:\n", fast_backward ? " (rewind)" : "");
 207        fwrite(sb.buf, sb.len, 1, f);
 208
 209        if (!message) {
 210                while ((commit = get_revision(&rev))) {
 211                        struct pretty_print_context ctx = {0};
 212                        ctx.date_mode = rev.date_mode;
 213                        strbuf_setlen(&sb, 0);
 214                        if (commit->object.flags & SYMMETRIC_LEFT) {
 215                                if (del)
 216                                        strbuf_addstr(&sb, del);
 217                        }
 218                        else if (add)
 219                                strbuf_addstr(&sb, add);
 220                        format_commit_message(commit, format, &sb, &ctx);
 221                        if (reset)
 222                                strbuf_addstr(&sb, reset);
 223                        strbuf_addch(&sb, '\n');
 224                        fprintf(f, "%s", sb.buf);
 225                }
 226                clear_commit_marks(left, ~0);
 227                clear_commit_marks(right, ~0);
 228        }
 229        strbuf_release(&sb);
 230}
 231
 232unsigned is_submodule_modified(const char *path, int ignore_untracked)
 233{
 234        ssize_t len;
 235        struct child_process cp;
 236        const char *argv[] = {
 237                "status",
 238                "--porcelain",
 239                NULL,
 240                NULL,
 241        };
 242        struct strbuf buf = STRBUF_INIT;
 243        unsigned dirty_submodule = 0;
 244        const char *line, *next_line;
 245        const char *git_dir;
 246
 247        strbuf_addf(&buf, "%s/.git", path);
 248        git_dir = read_gitfile_gently(buf.buf);
 249        if (!git_dir)
 250                git_dir = buf.buf;
 251        if (!is_directory(git_dir)) {
 252                strbuf_release(&buf);
 253                /* The submodule is not checked out, so it is not modified */
 254                return 0;
 255
 256        }
 257        strbuf_reset(&buf);
 258
 259        if (ignore_untracked)
 260                argv[2] = "-uno";
 261
 262        memset(&cp, 0, sizeof(cp));
 263        cp.argv = argv;
 264        cp.env = local_repo_env;
 265        cp.git_cmd = 1;
 266        cp.no_stdin = 1;
 267        cp.out = -1;
 268        cp.dir = path;
 269        if (start_command(&cp))
 270                die("Could not run git status --porcelain");
 271
 272        len = strbuf_read(&buf, cp.out, 1024);
 273        line = buf.buf;
 274        while (len > 2) {
 275                if ((line[0] == '?') && (line[1] == '?')) {
 276                        dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
 277                        if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 278                                break;
 279                } else {
 280                        dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
 281                        if (ignore_untracked ||
 282                            (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
 283                                break;
 284                }
 285                next_line = strchr(line, '\n');
 286                if (!next_line)
 287                        break;
 288                next_line++;
 289                len -= (next_line - line);
 290                line = next_line;
 291        }
 292        close(cp.out);
 293
 294        if (finish_command(&cp))
 295                die("git status --porcelain failed");
 296
 297        strbuf_release(&buf);
 298        return dirty_submodule;
 299}
 300
 301static int find_first_merges(struct object_array *result, const char *path,
 302                struct commit *a, struct commit *b)
 303{
 304        int i, j;
 305        struct object_array merges;
 306        struct commit *commit;
 307        int contains_another;
 308
 309        char merged_revision[42];
 310        const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
 311                                   "--all", merged_revision, NULL };
 312        struct rev_info revs;
 313        struct setup_revision_opt rev_opts;
 314
 315        memset(&merges, 0, sizeof(merges));
 316        memset(result, 0, sizeof(struct object_array));
 317        memset(&rev_opts, 0, sizeof(rev_opts));
 318
 319        /* get all revisions that merge commit a */
 320        snprintf(merged_revision, sizeof(merged_revision), "^%s",
 321                        sha1_to_hex(a->object.sha1));
 322        init_revisions(&revs, NULL);
 323        rev_opts.submodule = path;
 324        setup_revisions(sizeof(rev_args)/sizeof(char *)-1, rev_args, &revs, &rev_opts);
 325
 326        /* save all revisions from the above list that contain b */
 327        if (prepare_revision_walk(&revs))
 328                die("revision walk setup failed");
 329        while ((commit = get_revision(&revs)) != NULL) {
 330                struct object *o = &(commit->object);
 331                if (in_merge_bases(b, &commit, 1))
 332                        add_object_array(o, NULL, &merges);
 333        }
 334
 335        /* Now we've got all merges that contain a and b. Prune all
 336         * merges that contain another found merge and save them in
 337         * result.
 338         */
 339        for (i = 0; i < merges.nr; i++) {
 340                struct commit *m1 = (struct commit *) merges.objects[i].item;
 341
 342                contains_another = 0;
 343                for (j = 0; j < merges.nr; j++) {
 344                        struct commit *m2 = (struct commit *) merges.objects[j].item;
 345                        if (i != j && in_merge_bases(m2, &m1, 1)) {
 346                                contains_another = 1;
 347                                break;
 348                        }
 349                }
 350
 351                if (!contains_another)
 352                        add_object_array(merges.objects[i].item,
 353                                         merges.objects[i].name, result);
 354        }
 355
 356        free(merges.objects);
 357        return result->nr;
 358}
 359
 360static void print_commit(struct commit *commit)
 361{
 362        struct strbuf sb = STRBUF_INIT;
 363        struct pretty_print_context ctx = {0};
 364        ctx.date_mode = DATE_NORMAL;
 365        format_commit_message(commit, " %h: %m %s", &sb, &ctx);
 366        fprintf(stderr, "%s\n", sb.buf);
 367        strbuf_release(&sb);
 368}
 369
 370#define MERGE_WARNING(path, msg) \
 371        warning("Failed to merge submodule %s (%s)", path, msg);
 372
 373int merge_submodule(unsigned char result[20], const char *path,
 374                    const unsigned char base[20], const unsigned char a[20],
 375                    const unsigned char b[20])
 376{
 377        struct commit *commit_base, *commit_a, *commit_b;
 378        int parent_count;
 379        struct object_array merges;
 380
 381        int i;
 382
 383        /* store a in result in case we fail */
 384        hashcpy(result, a);
 385
 386        /* we can not handle deletion conflicts */
 387        if (is_null_sha1(base))
 388                return 0;
 389        if (is_null_sha1(a))
 390                return 0;
 391        if (is_null_sha1(b))
 392                return 0;
 393
 394        if (add_submodule_odb(path)) {
 395                MERGE_WARNING(path, "not checked out");
 396                return 0;
 397        }
 398
 399        if (!(commit_base = lookup_commit_reference(base)) ||
 400            !(commit_a = lookup_commit_reference(a)) ||
 401            !(commit_b = lookup_commit_reference(b))) {
 402                MERGE_WARNING(path, "commits not present");
 403                return 0;
 404        }
 405
 406        /* check whether both changes are forward */
 407        if (!in_merge_bases(commit_base, &commit_a, 1) ||
 408            !in_merge_bases(commit_base, &commit_b, 1)) {
 409                MERGE_WARNING(path, "commits don't follow merge-base");
 410                return 0;
 411        }
 412
 413        /* Case #1: a is contained in b or vice versa */
 414        if (in_merge_bases(commit_a, &commit_b, 1)) {
 415                hashcpy(result, b);
 416                return 1;
 417        }
 418        if (in_merge_bases(commit_b, &commit_a, 1)) {
 419                hashcpy(result, a);
 420                return 1;
 421        }
 422
 423        /*
 424         * Case #2: There are one or more merges that contain a and b in
 425         * the submodule. If there is only one, then present it as a
 426         * suggestion to the user, but leave it marked unmerged so the
 427         * user needs to confirm the resolution.
 428         */
 429
 430        /* find commit which merges them */
 431        parent_count = find_first_merges(&merges, path, commit_a, commit_b);
 432        switch (parent_count) {
 433        case 0:
 434                MERGE_WARNING(path, "merge following commits not found");
 435                break;
 436
 437        case 1:
 438                MERGE_WARNING(path, "not fast-forward");
 439                fprintf(stderr, "Found a possible merge resolution "
 440                                "for the submodule:\n");
 441                print_commit((struct commit *) merges.objects[0].item);
 442                fprintf(stderr,
 443                        "If this is correct simply add it to the index "
 444                        "for example\n"
 445                        "by using:\n\n"
 446                        "  git update-index --cacheinfo 160000 %s \"%s\"\n\n"
 447                        "which will accept this suggestion.\n",
 448                        sha1_to_hex(merges.objects[0].item->sha1), path);
 449                break;
 450
 451        default:
 452                MERGE_WARNING(path, "multiple merges found");
 453                for (i = 0; i < merges.nr; i++)
 454                        print_commit((struct commit *) merges.objects[i].item);
 455        }
 456
 457        free(merges.objects);
 458        return 0;
 459}