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 *commit_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                 commit_prefix = "| ";
  52                 if (commit->object.flags & DISCONTINUITY) {
  53                         commit_prefix = "^ ";
  54                 } else if (commit->object.flags & BOUNDARY) {
  55                         commit_prefix = "= ";
  56                 }
  57         }
  58         printf("%s%s", commit_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         if (commit_format == CMIT_FMT_ONELINE)
  67                 putchar(' ');
  68         else
  69                 putchar('\n');
  70
  71         if (verbose_header) {
  72                 static char pretty_header[16384];
  73                 pretty_print_commit(commit_format, commit->buffer, ~0, pretty_header, sizeof(pretty_header));
  74                 printf("%s%c", pretty_header, hdr_termination);
  75         }
  76         fflush(stdout);
  77 }
  78
  79 static int filter_commit(struct commit * commit)
  80 {
  81         if (stop_traversal && (commit->object.flags & BOUNDARY))
  82                 return STOP;
  83         if (commit->object.flags & (UNINTERESTING|SHOWN))
  84                 return CONTINUE;
  85         if (min_age != -1 && (commit->date > min_age))
  86                 return CONTINUE;
  87         if (max_age != -1 && (commit->date < max_age)) {
  88                 stop_traversal=1;
  89                 return merge_order?CONTINUE:STOP;
  90         }
  91         if (max_count != -1 && !max_count--)
  92                 return STOP;
  93         if (no_merges && (commit->parents && commit->parents->next))
  94                 return CONTINUE;
  95         return DO;
  96 }
  97
  98 static int process_commit(struct commit * commit)
  99 {
 100         int action=filter_commit(commit);
 101
 102         if (action == STOP) {
 103                 return STOP;
 104         }
 105
 106         if (action == CONTINUE) {
 107                 return CONTINUE;
 108         }
 109
 110         show_commit(commit);
 111
 112         return CONTINUE;
 113 }
 114
 115 static struct object_list **add_object(struct object *obj, struct object_list **p, const char *name)
 116 {
 117         struct object_list *entry = xmalloc(sizeof(*entry));
 118         entry->item = obj;
 119         entry->next = *p;
 120         entry->name = name;
 121         *p = entry;
 122         return &entry->next;
 123 }
 124
 125 static struct object_list **process_blob(struct blob *blob, struct object_list **p, const char *name)
 126 {
 127         struct object *obj = &blob->object;
 128
 129         if (!blob_objects)
 130                 return p;
 131         if (obj->flags & (UNINTERESTING | SEEN))
 132                 return p;
 133         obj->flags |= SEEN;
 134         return add_object(obj, p, name);
 135 }
 136
 137 static struct object_list **process_tree(struct tree *tree, struct object_list **p, const char *name)
 138 {
 139         struct object *obj = &tree->object;
 140         struct tree_entry_list *entry;
 141
 142         if (!tree_objects)
 143                 return p;
 144         if (obj->flags & (UNINTERESTING | SEEN))
 145                 return p;
 146         if (parse_tree(tree) < 0)
 147                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 148         obj->flags |= SEEN;
 149         p = add_object(obj, p, name);
 150         entry = tree->entries;
 151         tree->entries = NULL;
 152         while (entry) {
 153                 struct tree_entry_list *next = entry->next;
 154                 if (entry->directory)
 155                         p = process_tree(entry->item.tree, p, entry->name);
 156                 else
 157                         p = process_blob(entry->item.blob, p, entry->name);
 158                 free(entry);
 159                 entry = next;
 160         }
 161         return p;
 162 }
 163
 164 static struct object_list *pending_objects = NULL;
 165
 166 static void show_commit_list(struct commit_list *list)
 167 {
 168         struct object_list *objects = NULL, **p = &objects, *pending;
 169         while (list) {
 170                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 171
 172                 p = process_tree(commit->tree, p, "");
 173                 if (process_commit(commit) == STOP)
 174                         break;
 175         }
 176         for (pending = pending_objects; pending; pending = pending->next) {
 177                 struct object *obj = pending->item;
 178                 const char *name = pending->name;
 179                 if (obj->flags & (UNINTERESTING | SEEN))
 180                         continue;
 181                 if (obj->type == tag_type) {
 182                         obj->flags |= SEEN;
 183                         p = add_object(obj, p, name);
 184                         continue;
 185                 }
 186                 if (obj->type == tree_type) {
 187                         p = process_tree((struct tree *)obj, p, name);
 188                         continue;
 189                 }
 190                 if (obj->type == blob_type) {
 191                         p = process_blob((struct blob *)obj, p, name);
 192                         continue;
 193                 }
 194                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 195         }
 196         while (objects) {
 197                 printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 198                 objects = objects->next;
 199         }
 200 }
 201
 202 static void mark_blob_uninteresting(struct blob *blob)
 203 {
 204         if (!blob_objects)
 205                 return;
 206         if (blob->object.flags & UNINTERESTING)
 207                 return;
 208         blob->object.flags |= UNINTERESTING;
 209 }
 210
 211 static void mark_tree_uninteresting(struct tree *tree)
 212 {
 213         struct object *obj = &tree->object;
 214         struct tree_entry_list *entry;
 215
 216         if (!tree_objects)
 217                 return;
 218         if (obj->flags & UNINTERESTING)
 219                 return;
 220         obj->flags |= UNINTERESTING;
 221         if (!has_sha1_file(obj->sha1))
 222                 return;
 223         if (parse_tree(tree) < 0)
 224                 die("bad tree %s", sha1_to_hex(obj->sha1));
 225         entry = tree->entries;
 226         tree->entries = NULL;
 227         while (entry) {
 228                 struct tree_entry_list *next = entry->next;
 229                 if (entry->directory)
 230                         mark_tree_uninteresting(entry->item.tree);
 231                 else
 232                         mark_blob_uninteresting(entry->item.blob);
 233                 free(entry);
 234                 entry = next;
 235         }
 236 }
 237
 238 static void mark_parents_uninteresting(struct commit *commit)
 239 {
 240         struct commit_list *parents = commit->parents;
 241
 242         while (parents) {
 243                 struct commit *commit = parents->item;
 244                 commit->object.flags |= UNINTERESTING;
 245
 246                 /*
 247                  * Normally we haven't parsed the parent
 248                  * yet, so we won't have a parent of a parent
 249                  * here. However, it may turn out that we've
 250                  * reached this commit some other way (where it
 251                  * wasn't uninteresting), in which case we need
 252                  * to mark its parents recursively too..
 253                  */
 254                 if (commit->parents)
 255                         mark_parents_uninteresting(commit);
 256
 257                 /*
 258                  * A missing commit is ok iff its parent is marked
 259                  * uninteresting.
 260                  *
 261                  * We just mark such a thing parsed, so that when
 262                  * it is popped next time around, we won't be trying
 263                  * to parse it and get an error.
 264                  */
 265                 if (!has_sha1_file(commit->object.sha1))
 266                         commit->object.parsed = 1;
 267                 parents = parents->next;
 268         }
 269 }
 270
 271 static int everybody_uninteresting(struct commit_list *orig)
 272 {
 273         struct commit_list *list = orig;
 274         while (list) {
 275                 struct commit *commit = list->item;
 276                 list = list->next;
 277                 if (commit->object.flags & UNINTERESTING)
 278                         continue;
 279                 return 0;
 280         }
 281         return 1;
 282 }
 283
 284 /*
 285  * This is a truly stupid algorithm, but it's only
 286  * used for bisection, and we just don't care enough.
 287  *
 288  * We care just barely enough to avoid recursing for
 289  * non-merge entries.
 290  */
 291 static int count_distance(struct commit_list *entry)
 292 {
 293         int nr = 0;
 294
 295         while (entry) {
 296                 struct commit *commit = entry->item;
 297                 struct commit_list *p;
 298
 299                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 300                         break;
 301                 nr++;
 302                 commit->object.flags |= COUNTED;
 303                 p = commit->parents;
 304                 entry = p;
 305                 if (p) {
 306                         p = p->next;
 307                         while (p) {
 308                                 nr += count_distance(p);
 309                                 p = p->next;
 310                         }
 311                 }
 312         }
 313         return nr;
 314 }
 315
 316 static void clear_distance(struct commit_list *list)
 317 {
 318         while (list) {
 319                 struct commit *commit = list->item;
 320                 commit->object.flags &= ~COUNTED;
 321                 list = list->next;
 322         }
 323 }
 324
 325 static struct commit_list *find_bisection(struct commit_list *list)
 326 {
 327         int nr, closest;
 328         struct commit_list *p, *best;
 329
 330         nr = 0;
 331         p = list;
 332         while (p) {
 333                 nr++;
 334                 p = p->next;
 335         }
 336         closest = 0;
 337         best = list;
 338
 339         p = list;
 340         while (p) {
 341                 int distance = count_distance(p);
 342                 clear_distance(list);
 343                 if (nr - distance < distance)
 344                         distance = nr - distance;
 345                 if (distance > closest) {
 346                         best = p;
 347                         closest = distance;
 348                 }
 349                 p = p->next;
 350         }
 351         if (best)
 352                 best->next = NULL;
 353         return best;
 354 }
 355
 356 static void mark_edges_uninteresting(struct commit_list *list)
 357 {
 358         for ( ; list; list = list->next) {
 359                 struct commit_list *parents = list->item->parents;
 360
 361                 for ( ; parents; parents = parents->next) {
 362                         struct commit *commit = parents->item;
 363                         if (commit->object.flags & UNINTERESTING)
 364                                 mark_tree_uninteresting(commit->tree);
 365                 }
 366         }
 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 (tree_objects)
 388                 mark_edges_uninteresting(newlist);
 389         if (bisect_list)
 390                 newlist = find_bisection(newlist);
 391         return newlist;
 392 }
 393
 394 static void add_pending_object(struct object *obj, const char *name)
 395 {
 396         add_object(obj, &pending_objects, name);
 397 }
 398
 399 static struct commit *get_commit_reference(const char *name, unsigned int flags)
 400 {
 401         unsigned char sha1[20];
 402         struct object *object;
 403
 404         if (get_sha1(name, sha1))
 405                 usage(rev_list_usage);
 406         object = parse_object(sha1);
 407         if (!object)
 408                 die("bad object %s", name);
 409
 410         /*
 411          * Tag object? Look what it points to..
 412          */
 413         while (object->type == tag_type) {
 414                 struct tag *tag = (struct tag *) object;
 415                 object->flags |= flags;
 416                 if (tag_objects && !(object->flags & UNINTERESTING))
 417                         add_pending_object(object, tag->tag);
 418                 object = parse_object(tag->tagged->sha1);
 419                 if (!object)
 420                         die("bad object %s", sha1_to_hex(tag->tagged->sha1));
 421         }
 422
 423         /*
 424          * Commit object? Just return it, we'll do all the complex
 425          * reachability crud.
 426          */
 427         if (object->type == commit_type) {
 428                 struct commit *commit = (struct commit *)object;
 429                 object->flags |= flags;
 430                 if (parse_commit(commit) < 0)
 431                         die("unable to parse commit %s", name);
 432                 if (flags & UNINTERESTING)
 433                         mark_parents_uninteresting(commit);
 434                 return commit;
 435         }
 436
 437         /*
 438          * Tree object? Either mark it uniniteresting, or add it
 439          * to the list of objects to look at later..
 440          */
 441         if (object->type == tree_type) {
 442                 struct tree *tree = (struct tree *)object;
 443                 if (!tree_objects)
 444                         return NULL;
 445                 if (flags & UNINTERESTING) {
 446                         mark_tree_uninteresting(tree);
 447                         return NULL;
 448                 }
 449                 add_pending_object(object, "");
 450                 return NULL;
 451         }
 452
 453         /*
 454          * Blob object? You know the drill by now..
 455          */
 456         if (object->type == blob_type) {
 457                 struct blob *blob = (struct blob *)object;
 458                 if (!blob_objects)
 459                         return NULL;
 460                 if (flags & UNINTERESTING) {
 461                         mark_blob_uninteresting(blob);
 462                         return NULL;
 463                 }
 464                 add_pending_object(object, "");
 465                 return NULL;
 466         }
 467         die("%s is unknown object", name);
 468 }
 469
 470 static void handle_one_commit(struct commit *com, struct commit_list **lst)
 471 {
 472         if (!com || com->object.flags & SEEN)
 473                 return;
 474         com->object.flags |= SEEN;
 475         commit_list_insert(com, lst);
 476 }
 477
 478
 479 int main(int argc, char **argv)
 480 {
 481         struct commit_list *list = NULL;
 482         int i, limited = 0;
 483
 484         setup_git_directory();
 485         for (i = 1 ; i < argc; i++) {
 486                 int flags;
 487                 char *arg = argv[i];
 488                 char *dotdot;
 489                 struct commit *commit;
 490
 491                 if (!strncmp(arg, "--max-count=", 12)) {
 492                         max_count = atoi(arg + 12);
 493                         continue;
 494                 }
 495                 if (!strncmp(arg, "--max-age=", 10)) {
 496                         max_age = atoi(arg + 10);
 497                         continue;
 498                 }
 499                 if (!strncmp(arg, "--min-age=", 10)) {
 500                         min_age = atoi(arg + 10);
 501                         continue;
 502                 }
 503                 if (!strcmp(arg, "--header")) {
 504                         verbose_header = 1;
 505                         continue;
 506                 }
 507                 if (!strncmp(arg, "--pretty", 8)) {
 508                         commit_format = get_commit_format(arg+8);
 509                         verbose_header = 1;
 510                         hdr_termination = '\n';
 511                         if (commit_format == CMIT_FMT_ONELINE)
 512                                 commit_prefix = "";
 513                         else
 514                                 commit_prefix = "commit ";
 515                         continue;
 516                 }
 517                 if (!strncmp(arg, "--no-merges", 11)) {
 518                         no_merges = 1;
 519                         continue;
 520                 }
 521                 if (!strcmp(arg, "--parents")) {
 522                         show_parents = 1;
 523                         continue;
 524                 }
 525                 if (!strcmp(arg, "--bisect")) {
 526                         bisect_list = 1;
 527                         continue;
 528                 }
 529                 if (!strcmp(arg, "--objects")) {
 530                         tag_objects = 1;
 531                         tree_objects = 1;
 532                         blob_objects = 1;
 533                         continue;
 534                 }
 535                 if (!strcmp(arg, "--unpacked")) {
 536                         unpacked = 1;
 537                         limited = 1;
 538                         continue;
 539                 }
 540                 if (!strcmp(arg, "--merge-order")) {
 541                         merge_order = 1;
 542                         continue;
 543                 }
 544                 if (!strcmp(arg, "--show-breaks")) {
 545                         show_breaks = 1;
 546                         continue;
 547                 }
 548                 if (!strcmp(arg, "--topo-order")) {
 549                         topo_order = 1;
 550                         limited = 1;
 551                         continue;
 552                 }
 553
 554                 if (show_breaks && !merge_order)
 555                         usage(rev_list_usage);
 556
 557                 flags = 0;
 558                 dotdot = strstr(arg, "..");
 559                 if (dotdot) {
 560                         char *next = dotdot + 2;
 561                         struct commit *exclude = NULL;
 562                         struct commit *include = NULL;
 563                         *dotdot = 0;
 564                         if (!*next)
 565                                 next = "HEAD";
 566                         exclude = get_commit_reference(arg, UNINTERESTING);
 567                         include = get_commit_reference(next, 0);
 568                         if (exclude && include) {
 569                                 limited = 1;
 570                                 handle_one_commit(exclude, &list);
 571                                 handle_one_commit(include, &list);
 572                                 continue;
 573                         }
 574                         *dotdot = '.';
 575                 }
 576                 if (*arg == '^') {
 577                         flags = UNINTERESTING;
 578                         arg++;
 579                         limited = 1;
 580                 }
 581                 commit = get_commit_reference(arg, flags);
 582                 handle_one_commit(commit, &list);
 583         }
 584
 585         save_commit_buffer = verbose_header;
 586         track_object_refs = 0;
 587
 588         if (!merge_order) {
 589                 sort_by_date(&list);
 590                 if (limited)
 591                         list = limit_list(list);
 592                 if (topo_order)
 593                         sort_in_topological_order(&list);
 594                 show_commit_list(list);
 595         } else {
 596 #ifndef NO_OPENSSL
 597                 if (sort_list_in_merge_order(list, &process_commit)) {
 598                         die("merge order sort failed\n");
 599                 }
 600 #else
 601                 die("merge order sort unsupported, OpenSSL not linked");
 602 #endif
 603         }
 604
 605         return 0;
 606 }