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                       "  --parents\n"
  19                       "  --bisect\n"
  20                       "  --objects\n"
  21                       "  --unpacked\n"
  22                       "  --header\n"
  23                       "  --pretty\n"
  24                       "  --no-merges\n"
  25                       "  --merge-order [ --show-breaks ]\n"
  26                       "  --topo-order";
  27
  28 static int unpacked = 0;
  29 static int bisect_list = 0;
  30 static int tag_objects = 0;
  31 static int tree_objects = 0;
  32 static int blob_objects = 0;
  33 static int verbose_header = 0;
  34 static int show_parents = 0;
  35 static int hdr_termination = 0;
  36 static const char *prefix = "";
  37 static unsigned long max_age = -1;
  38 static unsigned long min_age = -1;
  39 static int max_count = -1;
  40 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  41 static int merge_order = 0;
  42 static int show_breaks = 0;
  43 static int stop_traversal = 0;
  44 static int topo_order = 0;
  45 static int no_merges = 0;
  46
  47 static void show_commit(struct commit *commit)
  48 {
  49         commit->object.flags |= SHOWN;
  50         if (show_breaks) {
  51                 prefix = "| ";
  52                 if (commit->object.flags & DISCONTINUITY) {
  53                         prefix = "^ ";
  54                 } else if (commit->object.flags & BOUNDARY) {
  55                         prefix = "= ";
  56                 }
  57         }
  58         printf("%s%s", prefix, sha1_to_hex(commit->object.sha1));
  59         if (show_parents) {
  60                 struct commit_list *parents = commit->parents;
  61                 while (parents) {
  62                         printf(" %s", sha1_to_hex(parents->item->object.sha1));
  63                         parents = parents->next;
  64                 }
  65         }
  66         putchar('\n');
  67         if (verbose_header) {
  68                 static char pretty_header[16384];
  69                 pretty_print_commit(commit_format, commit->buffer, ~0, pretty_header, sizeof(pretty_header));
  70                 printf("%s%c", pretty_header, hdr_termination);
  71         }
  72         fflush(stdout);
  73 }
  74
  75 static int filter_commit(struct commit * commit)
  76 {
  77         if (stop_traversal && (commit->object.flags & BOUNDARY))
  78                 return STOP;
  79         if (commit->object.flags & (UNINTERESTING|SHOWN))
  80                 return CONTINUE;
  81         if (min_age != -1 && (commit->date > min_age))
  82                 return CONTINUE;
  83         if (max_age != -1 && (commit->date < max_age)) {
  84                 stop_traversal=1;
  85                 return merge_order?CONTINUE:STOP;
  86         }
  87         if (max_count != -1 && !max_count--)
  88                 return STOP;
  89         if (no_merges && (commit->parents && commit->parents->next))
  90                 return CONTINUE;
  91         return DO;
  92 }
  93
  94 static int process_commit(struct commit * commit)
  95 {
  96         int action=filter_commit(commit);
  97
  98         if (action == STOP) {
  99                 return STOP;
 100         }
 101
 102         if (action == CONTINUE) {
 103                 return CONTINUE;
 104         }
 105
 106         show_commit(commit);
 107
 108         return CONTINUE;
 109 }
 110
 111 static struct object_list **add_object(struct object *obj, struct object_list **p, const char *name)
 112 {
 113         struct object_list *entry = xmalloc(sizeof(*entry));
 114         entry->item = obj;
 115         entry->next = *p;
 116         entry->name = name;
 117         *p = entry;
 118         return &entry->next;
 119 }
 120
 121 static struct object_list **process_blob(struct blob *blob, struct object_list **p, const char *name)
 122 {
 123         struct object *obj = &blob->object;
 124
 125         if (!blob_objects)
 126                 return p;
 127         if (obj->flags & (UNINTERESTING | SEEN))
 128                 return p;
 129         obj->flags |= SEEN;
 130         return add_object(obj, p, name);
 131 }
 132
 133 static struct object_list **process_tree(struct tree *tree, struct object_list **p, const char *name)
 134 {
 135         struct object *obj = &tree->object;
 136         struct tree_entry_list *entry;
 137
 138         if (!tree_objects)
 139                 return p;
 140         if (obj->flags & (UNINTERESTING | SEEN))
 141                 return p;
 142         if (parse_tree(tree) < 0)
 143                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 144         obj->flags |= SEEN;
 145         p = add_object(obj, p, name);
 146         for (entry = tree->entries ; entry ; entry = entry->next) {
 147                 if (entry->directory)
 148                         p = process_tree(entry->item.tree, p, entry->name);
 149                 else
 150                         p = process_blob(entry->item.blob, p, entry->name);
 151         }
 152         return p;
 153 }
 154
 155 static struct object_list *pending_objects = NULL;
 156
 157 static void show_commit_list(struct commit_list *list)
 158 {
 159         struct object_list *objects = NULL, **p = &objects, *pending;
 160         while (list) {
 161                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 162
 163                 p = process_tree(commit->tree, p, "");
 164                 if (process_commit(commit) == STOP)
 165                         break;
 166         }
 167         for (pending = pending_objects; pending; pending = pending->next) {
 168                 struct object *obj = pending->item;
 169                 const char *name = pending->name;
 170                 if (obj->flags & (UNINTERESTING | SEEN))
 171                         continue;
 172                 if (obj->type == tag_type) {
 173                         obj->flags |= SEEN;
 174                         p = add_object(obj, p, name);
 175                         continue;
 176                 }
 177                 if (obj->type == tree_type) {
 178                         p = process_tree((struct tree *)obj, p, name);
 179                         continue;
 180                 }
 181                 if (obj->type == blob_type) {
 182                         p = process_blob((struct blob *)obj, p, name);
 183                         continue;
 184                 }
 185                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 186         }
 187         while (objects) {
 188                 printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 189                 objects = objects->next;
 190         }
 191 }
 192
 193 static void mark_blob_uninteresting(struct blob *blob)
 194 {
 195         if (!blob_objects)
 196                 return;
 197         if (blob->object.flags & UNINTERESTING)
 198                 return;
 199         blob->object.flags |= UNINTERESTING;
 200 }
 201
 202 static void mark_tree_uninteresting(struct tree *tree)
 203 {
 204         struct object *obj = &tree->object;
 205         struct tree_entry_list *entry;
 206
 207         if (!tree_objects)
 208                 return;
 209         if (obj->flags & UNINTERESTING)
 210                 return;
 211         obj->flags |= UNINTERESTING;
 212         if (!has_sha1_file(obj->sha1))
 213                 return;
 214         if (parse_tree(tree) < 0)
 215                 die("bad tree %s", sha1_to_hex(obj->sha1));
 216         entry = tree->entries;
 217         while (entry) {
 218                 if (entry->directory)
 219                         mark_tree_uninteresting(entry->item.tree);
 220                 else
 221                         mark_blob_uninteresting(entry->item.blob);
 222                 entry = entry->next;
 223         }
 224 }
 225
 226 static void mark_parents_uninteresting(struct commit *commit)
 227 {
 228         struct commit_list *parents = commit->parents;
 229
 230         if (tree_objects)
 231                 mark_tree_uninteresting(commit->tree);
 232         while (parents) {
 233                 struct commit *commit = parents->item;
 234                 commit->object.flags |= UNINTERESTING;
 235
 236                 /*
 237                  * Normally we haven't parsed the parent
 238                  * yet, so we won't have a parent of a parent
 239                  * here. However, it may turn out that we've
 240                  * reached this commit some other way (where it
 241                  * wasn't uninteresting), in which case we need
 242                  * to mark its parents recursively too..
 243                  */
 244                 if (commit->parents)
 245                         mark_parents_uninteresting(commit);
 246
 247                 /*
 248                  * A missing commit is ok iff its parent is marked
 249                  * uninteresting.
 250                  *
 251                  * We just mark such a thing parsed, so that when
 252                  * it is popped next time around, we won't be trying
 253                  * to parse it and get an error.
 254                  */
 255                 if (!has_sha1_file(commit->object.sha1))
 256                         commit->object.parsed = 1;
 257                 parents = parents->next;
 258         }
 259 }
 260
 261 static int everybody_uninteresting(struct commit_list *orig)
 262 {
 263         struct commit_list *list = orig;
 264         while (list) {
 265                 struct commit *commit = list->item;
 266                 list = list->next;
 267                 if (commit->object.flags & UNINTERESTING)
 268                         continue;
 269                 return 0;
 270         }
 271
 272         /*
 273          * Ok, go back and mark all the edge trees uninteresting,
 274          * since otherwise we can have situations where a parent
 275          * that was marked uninteresting (and we never even had
 276          * to look at) had lots of objects that we don't want to
 277          * include.
 278          *
 279          * NOTE! This still doesn't mean that the object list is
 280          * "correct", since we may end up listing objects that
 281          * even older commits (that we don't list) do actually
 282          * reference, but it gets us to a minimal list (or very
 283          * close) in practice.
 284          */
 285         if (!tree_objects)
 286                 return 1;
 287
 288         while (orig) {
 289                 struct commit *commit = orig->item;
 290                 if (!parse_commit(commit) && commit->tree)
 291                         mark_tree_uninteresting(commit->tree);
 292                 orig = orig->next;
 293         }
 294         return 1;
 295 }
 296
 297 /*
 298  * This is a truly stupid algorithm, but it's only
 299  * used for bisection, and we just don't care enough.
 300  *
 301  * We care just barely enough to avoid recursing for
 302  * non-merge entries.
 303  */
 304 static int count_distance(struct commit_list *entry)
 305 {
 306         int nr = 0;
 307
 308         while (entry) {
 309                 struct commit *commit = entry->item;
 310                 struct commit_list *p;
 311
 312                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 313                         break;
 314                 nr++;
 315                 commit->object.flags |= COUNTED;
 316                 p = commit->parents;
 317                 entry = p;
 318                 if (p) {
 319                         p = p->next;
 320                         while (p) {
 321                                 nr += count_distance(p);
 322                                 p = p->next;
 323                         }
 324                 }
 325         }
 326         return nr;
 327 }
 328
 329 static void clear_distance(struct commit_list *list)
 330 {
 331         while (list) {
 332                 struct commit *commit = list->item;
 333                 commit->object.flags &= ~COUNTED;
 334                 list = list->next;
 335         }
 336 }
 337
 338 static struct commit_list *find_bisection(struct commit_list *list)
 339 {
 340         int nr, closest;
 341         struct commit_list *p, *best;
 342
 343         nr = 0;
 344         p = list;
 345         while (p) {
 346                 nr++;
 347                 p = p->next;
 348         }
 349         closest = 0;
 350         best = list;
 351
 352         p = list;
 353         while (p) {
 354                 int distance = count_distance(p);
 355                 clear_distance(list);
 356                 if (nr - distance < distance)
 357                         distance = nr - distance;
 358                 if (distance > closest) {
 359                         best = p;
 360                         closest = distance;
 361                 }
 362                 p = p->next;
 363         }
 364         if (best)
 365                 best->next = NULL;
 366         return best;
 367 }
 368
 369 static struct commit_list *limit_list(struct commit_list *list)
 370 {
 371         struct commit_list *newlist = NULL;
 372         struct commit_list **p = &newlist;
 373         while (list) {
 374                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 375                 struct object *obj = &commit->object;
 376
 377                 if (unpacked && has_sha1_pack(obj->sha1))
 378                         obj->flags |= UNINTERESTING;
 379                 if (obj->flags & UNINTERESTING) {
 380                         mark_parents_uninteresting(commit);
 381                         if (everybody_uninteresting(list))
 382                                 break;
 383                         continue;
 384                 }
 385                 p = &commit_list_insert(commit, p)->next;
 386         }
 387         if (bisect_list)
 388                 newlist = find_bisection(newlist);
 389         return newlist;
 390 }
 391
 392 static void add_pending_object(struct object *obj, const char *name)
 393 {
 394         add_object(obj, &pending_objects, name);
 395 }
 396
 397 static struct commit *get_commit_reference(const char *name, unsigned int flags)
 398 {
 399         unsigned char sha1[20];
 400         struct object *object;
 401
 402         if (get_sha1(name, sha1))
 403                 usage(rev_list_usage);
 404         object = parse_object(sha1);
 405         if (!object)
 406                 die("bad object %s", name);
 407
 408         /*
 409          * Tag object? Look what it points to..
 410          */
 411         while (object->type == tag_type) {
 412                 struct tag *tag = (struct tag *) object;
 413                 object->flags |= flags;
 414                 if (tag_objects && !(object->flags & UNINTERESTING))
 415                         add_pending_object(object, tag->tag);
 416                 object = parse_object(tag->tagged->sha1);
 417         }
 418
 419         /*
 420          * Commit object? Just return it, we'll do all the complex
 421          * reachability crud.
 422          */
 423         if (object->type == commit_type) {
 424                 struct commit *commit = (struct commit *)object;
 425                 object->flags |= flags;
 426                 if (parse_commit(commit) < 0)
 427                         die("unable to parse commit %s", name);
 428                 if (flags & UNINTERESTING)
 429                         mark_parents_uninteresting(commit);
 430                 return commit;
 431         }
 432
 433         /*
 434          * Tree object? Either mark it uniniteresting, or add it
 435          * to the list of objects to look at later..
 436          */
 437         if (object->type == tree_type) {
 438                 struct tree *tree = (struct tree *)object;
 439                 if (!tree_objects)
 440                         return NULL;
 441                 if (flags & UNINTERESTING) {
 442                         mark_tree_uninteresting(tree);
 443                         return NULL;
 444                 }
 445                 add_pending_object(object, "");
 446                 return NULL;
 447         }
 448
 449         /*
 450          * Blob object? You know the drill by now..
 451          */
 452         if (object->type == blob_type) {
 453                 struct blob *blob = (struct blob *)object;
 454                 if (!blob_objects)
 455                         return NULL;
 456                 if (flags & UNINTERESTING) {
 457                         mark_blob_uninteresting(blob);
 458                         return NULL;
 459                 }
 460                 add_pending_object(object, "");
 461                 return NULL;
 462         }
 463         die("%s is unknown object", name);
 464 }
 465
 466 static void handle_one_commit(struct commit *com, struct commit_list **lst)
 467 {
 468         if (!com || com->object.flags & SEEN)
 469                 return;
 470         com->object.flags |= SEEN;
 471         commit_list_insert(com, lst);
 472 }
 473
 474
 475 int main(int argc, char **argv)
 476 {
 477         struct commit_list *list = NULL;
 478         int i, limited = 0;
 479
 480         for (i = 1 ; i < argc; i++) {
 481                 int flags;
 482                 char *arg = argv[i];
 483                 char *dotdot;
 484                 struct commit *commit;
 485
 486                 if (!strncmp(arg, "--max-count=", 12)) {
 487                         max_count = atoi(arg + 12);
 488                         continue;
 489                 }
 490                 if (!strncmp(arg, "--max-age=", 10)) {
 491                         max_age = atoi(arg + 10);
 492                         continue;
 493                 }
 494                 if (!strncmp(arg, "--min-age=", 10)) {
 495                         min_age = atoi(arg + 10);
 496                         continue;
 497                 }
 498                 if (!strcmp(arg, "--header")) {
 499                         verbose_header = 1;
 500                         continue;
 501                 }
 502                 if (!strncmp(arg, "--pretty", 8)) {
 503                         commit_format = get_commit_format(arg+8);
 504                         verbose_header = 1;
 505                         hdr_termination = '\n';
 506                         prefix = "commit ";
 507                         continue;
 508                 }
 509                 if (!strncmp(arg, "--no-merges", 11)) {
 510                         no_merges = 1;
 511                         continue;
 512                 }
 513                 if (!strcmp(arg, "--parents")) {
 514                         show_parents = 1;
 515                         continue;
 516                 }
 517                 if (!strcmp(arg, "--bisect")) {
 518                         bisect_list = 1;
 519                         continue;
 520                 }
 521                 if (!strcmp(arg, "--objects")) {
 522                         tag_objects = 1;
 523                         tree_objects = 1;
 524                         blob_objects = 1;
 525                         continue;
 526                 }
 527                 if (!strcmp(arg, "--unpacked")) {
 528                         unpacked = 1;
 529                         limited = 1;
 530                         continue;
 531                 }
 532                 if (!strcmp(arg, "--merge-order")) {
 533                         merge_order = 1;
 534                         continue;
 535                 }
 536                 if (!strcmp(arg, "--show-breaks")) {
 537                         show_breaks = 1;
 538                         continue;
 539                 }
 540                 if (!strcmp(arg, "--topo-order")) {
 541                         topo_order = 1;
 542                         limited = 1;
 543                         continue;
 544                 }
 545
 546                 if (show_breaks && !merge_order)
 547                         usage(rev_list_usage);
 548
 549                 flags = 0;
 550                 dotdot = strstr(arg, "..");
 551                 if (dotdot) {
 552                         char *next = dotdot + 2;
 553                         struct commit *exclude = NULL;
 554                         struct commit *include = NULL;
 555                         *dotdot = 0;
 556                         exclude = get_commit_reference(arg, UNINTERESTING);
 557                         include = get_commit_reference(next, 0);
 558                         if (exclude && include) {
 559                                 limited = 1;
 560                                 handle_one_commit(exclude, &list);
 561                                 handle_one_commit(include, &list);
 562                                 continue;
 563                         }
 564                         *next = '.';
 565                 }
 566                 if (*arg == '^') {
 567                         flags = UNINTERESTING;
 568                         arg++;
 569                         limited = 1;
 570                 }
 571                 commit = get_commit_reference(arg, flags);
 572                 handle_one_commit(commit, &list);
 573         }
 574
 575         if (!merge_order) {
 576                 sort_by_date(&list);
 577                 if (limited)
 578                         list = limit_list(list);
 579                 if (topo_order)
 580                         sort_in_topological_order(&list);
 581                 show_commit_list(list);
 582         } else {
 583 #ifndef NO_OPENSSL
 584                 if (sort_list_in_merge_order(list, &process_commit)) {
 585                         die("merge order sort failed\n");
 586                 }
 587 #else
 588                 die("merge order sort unsupported, OpenSSL not linked");
 589 #endif
 590         }
 591
 592         return 0;
 593 }