rev-list.c

   1 #include "cache.h"
   2 #include "tag.h"
   3 #include "commit.h"
   4 #include "tree.h"
   5 #include "blob.h"
   6 #include "epoch.h"
   7
   8 #define SEEN            (1u << 0)
   9 #define INTERESTING     (1u << 1)
  10 #define COUNTED         (1u << 2)
  11 #define SHOWN           (1u << 3)
  12
  13 static const char rev_list_usage[] =
  14         "git-rev-list [OPTION] commit-id <commit-id>\n"
  15                       "  --max-count=nr\n"
  16                       "  --max-age=epoch\n"
  17                       "  --min-age=epoch\n"
  18                       "  --bisect\n"
  19                       "  --objects\n"
  20                       "  --unpacked\n"
  21                       "  --header\n"
  22                       "  --pretty\n"
  23                       "  --merge-order [ --show-breaks ]";
  24
  25 static int unpacked = 0;
  26 static int bisect_list = 0;
  27 static int tag_objects = 0;
  28 static int tree_objects = 0;
  29 static int blob_objects = 0;
  30 static int verbose_header = 0;
  31 static int show_parents = 0;
  32 static int hdr_termination = 0;
  33 static const char *prefix = "";
  34 static unsigned long max_age = -1;
  35 static unsigned long min_age = -1;
  36 static int max_count = -1;
  37 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  38 static int merge_order = 0;
  39 static int show_breaks = 0;
  40 static int stop_traversal = 0;
  41 static int topo_order = 0;
  42
  43 static void show_commit(struct commit *commit)
  44 {
  45         commit->object.flags |= SHOWN;
  46         if (show_breaks) {
  47                 prefix = "| ";
  48                 if (commit->object.flags & DISCONTINUITY) {
  49                         prefix = "^ ";
  50                 } else if (commit->object.flags & BOUNDARY) {
  51                         prefix = "= ";
  52                 }
  53         }
  54         printf("%s%s", prefix, sha1_to_hex(commit->object.sha1));
  55         if (show_parents) {
  56                 struct commit_list *parents = commit->parents;
  57                 while (parents) {
  58                         printf(" %s", sha1_to_hex(parents->item->object.sha1));
  59                         parents = parents->next;
  60                 }
  61         }
  62         putchar('\n');
  63         if (verbose_header) {
  64                 static char pretty_header[16384];
  65                 pretty_print_commit(commit_format, commit->buffer, ~0, pretty_header, sizeof(pretty_header));
  66                 printf("%s%c", pretty_header, hdr_termination);
  67         }
  68         fflush(stdout);
  69 }
  70
  71 static int filter_commit(struct commit * commit)
  72 {
  73         if (stop_traversal && (commit->object.flags & BOUNDARY))
  74                 return STOP;
  75         if (commit->object.flags & (UNINTERESTING|SHOWN))
  76                 return CONTINUE;
  77         if (min_age != -1 && (commit->date > min_age))
  78                 return CONTINUE;
  79         if (max_age != -1 && (commit->date < max_age)) {
  80                 stop_traversal=1;
  81                 return merge_order?CONTINUE:STOP;
  82         }
  83         if (max_count != -1 && !max_count--)
  84                 return STOP;
  85         return DO;
  86 }
  87
  88 static int process_commit(struct commit * commit)
  89 {
  90         int action=filter_commit(commit);
  91
  92         if (action == STOP) {
  93                 return STOP;
  94         }
  95
  96         if (action == CONTINUE) {
  97                 return CONTINUE;
  98         }
  99
 100         show_commit(commit);
 101
 102         return CONTINUE;
 103 }
 104
 105 static struct object_list **add_object(struct object *obj, struct object_list **p, const char *name)
 106 {
 107         struct object_list *entry = xmalloc(sizeof(*entry));
 108         entry->item = obj;
 109         entry->next = *p;
 110         entry->name = name;
 111         *p = entry;
 112         return &entry->next;
 113 }
 114
 115 static struct object_list **process_blob(struct blob *blob, struct object_list **p, const char *name)
 116 {
 117         struct object *obj = &blob->object;
 118
 119         if (!blob_objects)
 120                 return p;
 121         if (obj->flags & (UNINTERESTING | SEEN))
 122                 return p;
 123         obj->flags |= SEEN;
 124         return add_object(obj, p, name);
 125 }
 126
 127 static struct object_list **process_tree(struct tree *tree, struct object_list **p, const char *name)
 128 {
 129         struct object *obj = &tree->object;
 130         struct tree_entry_list *entry;
 131
 132         if (!tree_objects)
 133                 return p;
 134         if (obj->flags & (UNINTERESTING | SEEN))
 135                 return p;
 136         if (parse_tree(tree) < 0)
 137                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 138         obj->flags |= SEEN;
 139         p = add_object(obj, p, name);
 140         for (entry = tree->entries ; entry ; entry = entry->next) {
 141                 if (entry->directory)
 142                         p = process_tree(entry->item.tree, p, entry->name);
 143                 else
 144                         p = process_blob(entry->item.blob, p, entry->name);
 145         }
 146         return p;
 147 }
 148
 149 static struct object_list *pending_objects = NULL;
 150
 151 static void show_commit_list(struct commit_list *list)
 152 {
 153         struct object_list *objects = NULL, **p = &objects, *pending;
 154         while (list) {
 155                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 156
 157                 p = process_tree(commit->tree, p, "");
 158                 if (process_commit(commit) == STOP)
 159                         break;
 160         }
 161         for (pending = pending_objects; pending; pending = pending->next) {
 162                 struct object *obj = pending->item;
 163                 const char *name = pending->name;
 164                 if (obj->flags & (UNINTERESTING | SEEN))
 165                         continue;
 166                 if (obj->type == tag_type) {
 167                         obj->flags |= SEEN;
 168                         p = add_object(obj, p, name);
 169                         continue;
 170                 }
 171                 if (obj->type == tree_type) {
 172                         p = process_tree((struct tree *)obj, p, name);
 173                         continue;
 174                 }
 175                 if (obj->type == blob_type) {
 176                         p = process_blob((struct blob *)obj, p, name);
 177                         continue;
 178                 }
 179                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 180         }
 181         while (objects) {
 182                 printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 183                 objects = objects->next;
 184         }
 185 }
 186
 187 static void mark_blob_uninteresting(struct blob *blob)
 188 {
 189         if (!blob_objects)
 190                 return;
 191         if (blob->object.flags & UNINTERESTING)
 192                 return;
 193         blob->object.flags |= UNINTERESTING;
 194 }
 195
 196 static void mark_tree_uninteresting(struct tree *tree)
 197 {
 198         struct object *obj = &tree->object;
 199         struct tree_entry_list *entry;
 200
 201         if (!tree_objects)
 202                 return;
 203         if (obj->flags & UNINTERESTING)
 204                 return;
 205         obj->flags |= UNINTERESTING;
 206         if (!has_sha1_file(obj->sha1))
 207                 return;
 208         if (parse_tree(tree) < 0)
 209                 die("bad tree %s", sha1_to_hex(obj->sha1));
 210         entry = tree->entries;
 211         while (entry) {
 212                 if (entry->directory)
 213                         mark_tree_uninteresting(entry->item.tree);
 214                 else
 215                         mark_blob_uninteresting(entry->item.blob);
 216                 entry = entry->next;
 217         }
 218 }
 219
 220 static void mark_parents_uninteresting(struct commit *commit)
 221 {
 222         struct commit_list *parents = commit->parents;
 223
 224         if (tree_objects)
 225                 mark_tree_uninteresting(commit->tree);
 226         while (parents) {
 227                 struct commit *commit = parents->item;
 228                 commit->object.flags |= UNINTERESTING;
 229
 230                 /*
 231                  * Normally we haven't parsed the parent
 232                  * yet, so we won't have a parent of a parent
 233                  * here. However, it may turn out that we've
 234                  * reached this commit some other way (where it
 235                  * wasn't uninteresting), in which case we need
 236                  * to mark its parents recursively too..
 237                  */
 238                 if (commit->parents)
 239                         mark_parents_uninteresting(commit);
 240
 241                 /*
 242                  * A missing commit is ok iff its parent is marked
 243                  * uninteresting.
 244                  *
 245                  * We just mark such a thing parsed, so that when
 246                  * it is popped next time around, we won't be trying
 247                  * to parse it and get an error.
 248                  */
 249                 if (!has_sha1_file(commit->object.sha1))
 250                         commit->object.parsed = 1;
 251                 parents = parents->next;
 252         }
 253 }
 254
 255 static int everybody_uninteresting(struct commit_list *orig)
 256 {
 257         struct commit_list *list = orig;
 258         while (list) {
 259                 struct commit *commit = list->item;
 260                 list = list->next;
 261                 if (commit->object.flags & UNINTERESTING)
 262                         continue;
 263                 return 0;
 264         }
 265
 266         /*
 267          * Ok, go back and mark all the edge trees uninteresting,
 268          * since otherwise we can have situations where a parent
 269          * that was marked uninteresting (and we never even had
 270          * to look at) had lots of objects that we don't want to
 271          * include.
 272          *
 273          * NOTE! This still doesn't mean that the object list is
 274          * "correct", since we may end up listing objects that
 275          * even older commits (that we don't list) do actually
 276          * reference, but it gets us to a minimal list (or very
 277          * close) in practice.
 278          */
 279         if (!tree_objects)
 280                 return 1;
 281
 282         while (orig) {
 283                 struct commit *commit = orig->item;
 284                 if (!parse_commit(commit) && commit->tree)
 285                         mark_tree_uninteresting(commit->tree);
 286                 orig = orig->next;
 287         }
 288         return 1;
 289 }
 290
 291 /*
 292  * This is a truly stupid algorithm, but it's only
 293  * used for bisection, and we just don't care enough.
 294  *
 295  * We care just barely enough to avoid recursing for
 296  * non-merge entries.
 297  */
 298 static int count_distance(struct commit_list *entry)
 299 {
 300         int nr = 0;
 301
 302         while (entry) {
 303                 struct commit *commit = entry->item;
 304                 struct commit_list *p;
 305
 306                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 307                         break;
 308                 nr++;
 309                 commit->object.flags |= COUNTED;
 310                 p = commit->parents;
 311                 entry = p;
 312                 if (p) {
 313                         p = p->next;
 314                         while (p) {
 315                                 nr += count_distance(p);
 316                                 p = p->next;
 317                         }
 318                 }
 319         }
 320         return nr;
 321 }
 322
 323 static void clear_distance(struct commit_list *list)
 324 {
 325         while (list) {
 326                 struct commit *commit = list->item;
 327                 commit->object.flags &= ~COUNTED;
 328                 list = list->next;
 329         }
 330 }
 331
 332 static struct commit_list *find_bisection(struct commit_list *list)
 333 {
 334         int nr, closest;
 335         struct commit_list *p, *best;
 336
 337         nr = 0;
 338         p = list;
 339         while (p) {
 340                 nr++;
 341                 p = p->next;
 342         }
 343         closest = 0;
 344         best = list;
 345
 346         p = list;
 347         while (p) {
 348                 int distance = count_distance(p);
 349                 clear_distance(list);
 350                 if (nr - distance < distance)
 351                         distance = nr - distance;
 352                 if (distance > closest) {
 353                         best = p;
 354                         closest = distance;
 355                 }
 356                 p = p->next;
 357         }
 358         if (best)
 359                 best->next = NULL;
 360         return best;
 361 }
 362
 363 static struct commit_list *limit_list(struct commit_list *list)
 364 {
 365         struct commit_list *newlist = NULL;
 366         struct commit_list **p = &newlist;
 367         while (list) {
 368                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 369                 struct object *obj = &commit->object;
 370
 371                 if (unpacked && has_sha1_pack(obj->sha1))
 372                         obj->flags |= UNINTERESTING;
 373                 if (obj->flags & UNINTERESTING) {
 374                         mark_parents_uninteresting(commit);
 375                         if (everybody_uninteresting(list))
 376                                 break;
 377                         continue;
 378                 }
 379                 p = &commit_list_insert(commit, p)->next;
 380         }
 381         if (bisect_list)
 382                 newlist = find_bisection(newlist);
 383         return newlist;
 384 }
 385
 386 static void add_pending_object(struct object *obj, const char *name)
 387 {
 388         add_object(obj, &pending_objects, name);
 389 }
 390
 391 static struct commit *get_commit_reference(const char *name, unsigned int flags)
 392 {
 393         unsigned char sha1[20];
 394         struct object *object;
 395
 396         if (get_sha1(name, sha1))
 397                 usage(rev_list_usage);
 398         object = parse_object(sha1);
 399         if (!object)
 400                 die("bad object %s", name);
 401
 402         /*
 403          * Tag object? Look what it points to..
 404          */
 405         while (object->type == tag_type) {
 406                 struct tag *tag = (struct tag *) object;
 407                 object->flags |= flags;
 408                 if (tag_objects && !(object->flags & UNINTERESTING))
 409                         add_pending_object(object, tag->tag);
 410                 object = parse_object(tag->tagged->sha1);
 411         }
 412
 413         /*
 414          * Commit object? Just return it, we'll do all the complex
 415          * reachability crud.
 416          */
 417         if (object->type == commit_type) {
 418                 struct commit *commit = (struct commit *)object;
 419                 object->flags |= flags;
 420                 if (parse_commit(commit) < 0)
 421                         die("unable to parse commit %s", name);
 422                 if (flags & UNINTERESTING)
 423                         mark_parents_uninteresting(commit);
 424                 return commit;
 425         }
 426
 427         /*
 428          * Tree object? Either mark it uniniteresting, or add it
 429          * to the list of objects to look at later..
 430          */
 431         if (object->type == tree_type) {
 432                 struct tree *tree = (struct tree *)object;
 433                 if (!tree_objects)
 434                         return NULL;
 435                 if (flags & UNINTERESTING) {
 436                         mark_tree_uninteresting(tree);
 437                         return NULL;
 438                 }
 439                 add_pending_object(object, "");
 440                 return NULL;
 441         }
 442
 443         /*
 444          * Blob object? You know the drill by now..
 445          */
 446         if (object->type == blob_type) {
 447                 struct blob *blob = (struct blob *)object;
 448                 if (!blob_objects)
 449                         return NULL;
 450                 if (flags & UNINTERESTING) {
 451                         mark_blob_uninteresting(blob);
 452                         return NULL;
 453                 }
 454                 add_pending_object(object, "");
 455                 return NULL;
 456         }
 457         die("%s is unknown object", name);
 458 }
 459
 460 int main(int argc, char **argv)
 461 {
 462         struct commit_list *list = NULL;
 463         int i, limited = 0;
 464
 465         for (i = 1 ; i < argc; i++) {
 466                 int flags;
 467                 char *arg = argv[i];
 468                 struct commit *commit;
 469
 470                 if (!strncmp(arg, "--max-count=", 12)) {
 471                         max_count = atoi(arg + 12);
 472                         continue;
 473                 }
 474                 if (!strncmp(arg, "--max-age=", 10)) {
 475                         max_age = atoi(arg + 10);
 476                         continue;
 477                 }
 478                 if (!strncmp(arg, "--min-age=", 10)) {
 479                         min_age = atoi(arg + 10);
 480                         continue;
 481                 }
 482                 if (!strcmp(arg, "--header")) {
 483                         verbose_header = 1;
 484                         continue;
 485                 }
 486                 if (!strncmp(arg, "--pretty", 8)) {
 487                         commit_format = get_commit_format(arg+8);
 488                         verbose_header = 1;
 489                         hdr_termination = '\n';
 490                         prefix = "commit ";
 491                         continue;
 492                 }
 493                 if (!strcmp(arg, "--parents")) {
 494                         show_parents = 1;
 495                         continue;
 496                 }
 497                 if (!strcmp(arg, "--bisect")) {
 498                         bisect_list = 1;
 499                         continue;
 500                 }
 501                 if (!strcmp(arg, "--objects")) {
 502                         tag_objects = 1;
 503                         tree_objects = 1;
 504                         blob_objects = 1;
 505                         continue;
 506                 }
 507                 if (!strcmp(arg, "--unpacked")) {
 508                         unpacked = 1;
 509                         limited = 1;
 510                         continue;
 511                 }
 512                 if (!strcmp(arg, "--merge-order")) {
 513                         merge_order = 1;
 514                         continue;
 515                 }
 516                 if (!strcmp(arg, "--show-breaks")) {
 517                         show_breaks = 1;
 518                         continue;
 519                 }
 520                 if (!strcmp(arg, "--topo-order")) {
 521                         topo_order = 1;
 522                         limited = 1;
 523                         continue;
 524                 }
 525
 526                 flags = 0;
 527                 if (*arg == '^') {
 528                         flags = UNINTERESTING;
 529                         arg++;
 530                         limited = 1;
 531                 }
 532                 if (show_breaks && !merge_order)
 533                         usage(rev_list_usage);
 534                 commit = get_commit_reference(arg, flags);
 535                 if (!commit)
 536                         continue;
 537                 if (commit->object.flags & SEEN)
 538                         continue;
 539                 commit->object.flags |= SEEN;
 540                 commit_list_insert(commit, &list);
 541         }
 542
 543         if (!merge_order) {
 544                 sort_by_date(&list);
 545                 if (limited)
 546                         list = limit_list(list);
 547                 if (topo_order)
 548                         sort_in_topological_order(&list);
 549                 show_commit_list(list);
 550         } else {
 551 #ifndef NO_OPENSSL
 552                 if (sort_list_in_merge_order(list, &process_commit)) {
 553                         die("merge order sort failed\n");
 554                 }
 555 #else
 556                 die("merge order sort unsupported, OpenSSL not linked");
 557 #endif
 558         }
 559
 560         return 0;
 561 }