submodule.c

   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
  12 struct string_list config_name_for_path;
  13 struct string_list config_ignore_for_name;
  14
  15 static 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();
  49 done:
  50         strbuf_release(&objects_directory);
  51         return ret;
  52 }
  53
  54 void 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
  66 static 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
  73 void 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
  85 int 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
 124 void 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
 141 void 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
 232 unsigned 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
 301 static 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
 360 static 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
 373 int 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 }