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