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         for (entry = tree->entries ; entry ; entry = entry->next) {
 151                 if (entry->directory)
 152                         p = process_tree(entry->item.tree, p, entry->name);
 153                 else
 154                         p = process_blob(entry->item.blob, p, entry->name);
 155         }
 156         return p;
 157 }
 158
 159 static struct object_list *pending_objects = NULL;
 160
 161 static void show_commit_list(struct commit_list *list)
 162 {
 163         struct object_list *objects = NULL, **p = &objects, *pending;
 164         while (list) {
 165                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 166
 167                 p = process_tree(commit->tree, p, "");
 168                 if (process_commit(commit) == STOP)
 169                         break;
 170         }
 171         for (pending = pending_objects; pending; pending = pending->next) {
 172                 struct object *obj = pending->item;
 173                 const char *name = pending->name;
 174                 if (obj->flags & (UNINTERESTING | SEEN))
 175                         continue;
 176                 if (obj->type == tag_type) {
 177                         obj->flags |= SEEN;
 178                         p = add_object(obj, p, name);
 179                         continue;
 180                 }
 181                 if (obj->type == tree_type) {
 182                         p = process_tree((struct tree *)obj, p, name);
 183                         continue;
 184                 }
 185                 if (obj->type == blob_type) {
 186                         p = process_blob((struct blob *)obj, p, name);
 187                         continue;
 188                 }
 189                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 190         }
 191         while (objects) {
 192                 printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 193                 objects = objects->next;
 194         }
 195 }
 196
 197 static void mark_blob_uninteresting(struct blob *blob)
 198 {
 199         if (!blob_objects)
 200                 return;
 201         if (blob->object.flags & UNINTERESTING)
 202                 return;
 203         blob->object.flags |= UNINTERESTING;
 204 }
 205
 206 static void mark_tree_uninteresting(struct tree *tree)
 207 {
 208         struct object *obj = &tree->object;
 209         struct tree_entry_list *entry;
 210
 211         if (!tree_objects)
 212                 return;
 213         if (obj->flags & UNINTERESTING)
 214                 return;
 215         obj->flags |= UNINTERESTING;
 216         if (!has_sha1_file(obj->sha1))
 217                 return;
 218         if (parse_tree(tree) < 0)
 219                 die("bad tree %s", sha1_to_hex(obj->sha1));
 220         entry = tree->entries;
 221         while (entry) {
 222                 if (entry->directory)
 223                         mark_tree_uninteresting(entry->item.tree);
 224                 else
 225                         mark_blob_uninteresting(entry->item.blob);
 226                 entry = entry->next;
 227         }
 228 }
 229
 230 static void mark_parents_uninteresting(struct commit *commit)
 231 {
 232         struct commit_list *parents = commit->parents;
 233
 234         if (tree_objects)
 235                 mark_tree_uninteresting(commit->tree);
 236         while (parents) {
 237                 struct commit *commit = parents->item;
 238                 commit->object.flags |= UNINTERESTING;
 239
 240                 /*
 241                  * Normally we haven't parsed the parent
 242                  * yet, so we won't have a parent of a parent
 243                  * here. However, it may turn out that we've
 244                  * reached this commit some other way (where it
 245                  * wasn't uninteresting), in which case we need
 246                  * to mark its parents recursively too..
 247                  */
 248                 if (commit->parents)
 249                         mark_parents_uninteresting(commit);
 250
 251                 /*
 252                  * A missing commit is ok iff its parent is marked
 253                  * uninteresting.
 254                  *
 255                  * We just mark such a thing parsed, so that when
 256                  * it is popped next time around, we won't be trying
 257                  * to parse it and get an error.
 258                  */
 259                 if (!has_sha1_file(commit->object.sha1))
 260                         commit->object.parsed = 1;
 261                 parents = parents->next;
 262         }
 263 }
 264
 265 static int everybody_uninteresting(struct commit_list *orig)
 266 {
 267         struct commit_list *list = orig;
 268         while (list) {
 269                 struct commit *commit = list->item;
 270                 list = list->next;
 271                 if (commit->object.flags & UNINTERESTING)
 272                         continue;
 273                 return 0;
 274         }
 275
 276         /*
 277          * Ok, go back and mark all the edge trees uninteresting,
 278          * since otherwise we can have situations where a parent
 279          * that was marked uninteresting (and we never even had
 280          * to look at) had lots of objects that we don't want to
 281          * include.
 282          *
 283          * NOTE! This still doesn't mean that the object list is
 284          * "correct", since we may end up listing objects that
 285          * even older commits (that we don't list) do actually
 286          * reference, but it gets us to a minimal list (or very
 287          * close) in practice.
 288          */
 289         if (!tree_objects)
 290                 return 1;
 291
 292         while (orig) {
 293                 struct commit *commit = orig->item;
 294                 if (!parse_commit(commit) && commit->tree)
 295                         mark_tree_uninteresting(commit->tree);
 296                 orig = orig->next;
 297         }
 298         return 1;
 299 }
 300
 301 /*
 302  * This is a truly stupid algorithm, but it's only
 303  * used for bisection, and we just don't care enough.
 304  *
 305  * We care just barely enough to avoid recursing for
 306  * non-merge entries.
 307  */
 308 static int count_distance(struct commit_list *entry)
 309 {
 310         int nr = 0;
 311
 312         while (entry) {
 313                 struct commit *commit = entry->item;
 314                 struct commit_list *p;
 315
 316                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 317                         break;
 318                 nr++;
 319                 commit->object.flags |= COUNTED;
 320                 p = commit->parents;
 321                 entry = p;
 322                 if (p) {
 323                         p = p->next;
 324                         while (p) {
 325                                 nr += count_distance(p);
 326                                 p = p->next;
 327                         }
 328                 }
 329         }
 330         return nr;
 331 }
 332
 333 static void clear_distance(struct commit_list *list)
 334 {
 335         while (list) {
 336                 struct commit *commit = list->item;
 337                 commit->object.flags &= ~COUNTED;
 338                 list = list->next;
 339         }
 340 }
 341
 342 static struct commit_list *find_bisection(struct commit_list *list)
 343 {
 344         int nr, closest;
 345         struct commit_list *p, *best;
 346
 347         nr = 0;
 348         p = list;
 349         while (p) {
 350                 nr++;
 351                 p = p->next;
 352         }
 353         closest = 0;
 354         best = list;
 355
 356         p = list;
 357         while (p) {
 358                 int distance = count_distance(p);
 359                 clear_distance(list);
 360                 if (nr - distance < distance)
 361                         distance = nr - distance;
 362                 if (distance > closest) {
 363                         best = p;
 364                         closest = distance;
 365                 }
 366                 p = p->next;
 367         }
 368         if (best)
 369                 best->next = NULL;
 370         return best;
 371 }
 372
 373 static struct commit_list *limit_list(struct commit_list *list)
 374 {
 375         struct commit_list *newlist = NULL;
 376         struct commit_list **p = &newlist;
 377         while (list) {
 378                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 379                 struct object *obj = &commit->object;
 380
 381                 if (unpacked && has_sha1_pack(obj->sha1))
 382                         obj->flags |= UNINTERESTING;
 383                 if (obj->flags & UNINTERESTING) {
 384                         mark_parents_uninteresting(commit);
 385                         if (everybody_uninteresting(list))
 386                                 break;
 387                         continue;
 388                 }
 389                 p = &commit_list_insert(commit, p)->next;
 390         }
 391         if (bisect_list)
 392                 newlist = find_bisection(newlist);
 393         return newlist;
 394 }
 395
 396 static void add_pending_object(struct object *obj, const char *name)
 397 {
 398         add_object(obj, &pending_objects, name);
 399 }
 400
 401 static struct commit *get_commit_reference(const char *name, unsigned int flags)
 402 {
 403         unsigned char sha1[20];
 404         struct object *object;
 405
 406         if (get_sha1(name, sha1))
 407                 usage(rev_list_usage);
 408         object = parse_object(sha1);
 409         if (!object)
 410                 die("bad object %s", name);
 411
 412         /*
 413          * Tag object? Look what it points to..
 414          */
 415         while (object->type == tag_type) {
 416                 struct tag *tag = (struct tag *) object;
 417                 object->flags |= flags;
 418                 if (tag_objects && !(object->flags & UNINTERESTING))
 419                         add_pending_object(object, tag->tag);
 420                 object = parse_object(tag->tagged->sha1);
 421                 if (!object)
 422                         die("bad object %s", sha1_to_hex(tag->tagged->sha1));
 423         }
 424
 425         /*
 426          * Commit object? Just return it, we'll do all the complex
 427          * reachability crud.
 428          */
 429         if (object->type == commit_type) {
 430                 struct commit *commit = (struct commit *)object;
 431                 object->flags |= flags;
 432                 if (parse_commit(commit) < 0)
 433                         die("unable to parse commit %s", name);
 434                 if (flags & UNINTERESTING)
 435                         mark_parents_uninteresting(commit);
 436                 return commit;
 437         }
 438
 439         /*
 440          * Tree object? Either mark it uniniteresting, or add it
 441          * to the list of objects to look at later..
 442          */
 443         if (object->type == tree_type) {
 444                 struct tree *tree = (struct tree *)object;
 445                 if (!tree_objects)
 446                         return NULL;
 447                 if (flags & UNINTERESTING) {
 448                         mark_tree_uninteresting(tree);
 449                         return NULL;
 450                 }
 451                 add_pending_object(object, "");
 452                 return NULL;
 453         }
 454
 455         /*
 456          * Blob object? You know the drill by now..
 457          */
 458         if (object->type == blob_type) {
 459                 struct blob *blob = (struct blob *)object;
 460                 if (!blob_objects)
 461                         return NULL;
 462                 if (flags & UNINTERESTING) {
 463                         mark_blob_uninteresting(blob);
 464                         return NULL;
 465                 }
 466                 add_pending_object(object, "");
 467                 return NULL;
 468         }
 469         die("%s is unknown object", name);
 470 }
 471
 472 static void handle_one_commit(struct commit *com, struct commit_list **lst)
 473 {
 474         if (!com || com->object.flags & SEEN)
 475                 return;
 476         com->object.flags |= SEEN;
 477         commit_list_insert(com, lst);
 478 }
 479
 480
 481 int main(int argc, char **argv)
 482 {
 483         struct commit_list *list = NULL;
 484         int i, limited = 0;
 485
 486         setup_git_directory();
 487         for (i = 1 ; i < argc; i++) {
 488                 int flags;
 489                 char *arg = argv[i];
 490                 char *dotdot;
 491                 struct commit *commit;
 492
 493                 if (!strncmp(arg, "--max-count=", 12)) {
 494                         max_count = atoi(arg + 12);
 495                         continue;
 496                 }
 497                 if (!strncmp(arg, "--max-age=", 10)) {
 498                         max_age = atoi(arg + 10);
 499                         continue;
 500                 }
 501                 if (!strncmp(arg, "--min-age=", 10)) {
 502                         min_age = atoi(arg + 10);
 503                         continue;
 504                 }
 505                 if (!strcmp(arg, "--header")) {
 506                         verbose_header = 1;
 507                         continue;
 508                 }
 509                 if (!strncmp(arg, "--pretty", 8)) {
 510                         commit_format = get_commit_format(arg+8);
 511                         verbose_header = 1;
 512                         hdr_termination = '\n';
 513                         if (commit_format == CMIT_FMT_ONELINE)
 514                                 commit_prefix = "";
 515                         else
 516                                 commit_prefix = "commit ";
 517                         continue;
 518                 }
 519                 if (!strncmp(arg, "--no-merges", 11)) {
 520                         no_merges = 1;
 521                         continue;
 522                 }
 523                 if (!strcmp(arg, "--parents")) {
 524                         show_parents = 1;
 525                         continue;
 526                 }
 527                 if (!strcmp(arg, "--bisect")) {
 528                         bisect_list = 1;
 529                         continue;
 530                 }
 531                 if (!strcmp(arg, "--objects")) {
 532                         tag_objects = 1;
 533                         tree_objects = 1;
 534                         blob_objects = 1;
 535                         continue;
 536                 }
 537                 if (!strcmp(arg, "--unpacked")) {
 538                         unpacked = 1;
 539                         limited = 1;
 540                         continue;
 541                 }
 542                 if (!strcmp(arg, "--merge-order")) {
 543                         merge_order = 1;
 544                         continue;
 545                 }
 546                 if (!strcmp(arg, "--show-breaks")) {
 547                         show_breaks = 1;
 548                         continue;
 549                 }
 550                 if (!strcmp(arg, "--topo-order")) {
 551                         topo_order = 1;
 552                         limited = 1;
 553                         continue;
 554                 }
 555
 556                 if (show_breaks && !merge_order)
 557                         usage(rev_list_usage);
 558
 559                 flags = 0;
 560                 dotdot = strstr(arg, "..");
 561                 if (dotdot) {
 562                         char *next = dotdot + 2;
 563                         struct commit *exclude = NULL;
 564                         struct commit *include = NULL;
 565                         *dotdot = 0;
 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                         *next = '.';
 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         if (!merge_order) {
 586                 sort_by_date(&list);
 587                 if (limited)
 588                         list = limit_list(list);
 589                 if (topo_order)
 590                         sort_in_topological_order(&list);
 591                 show_commit_list(list);
 592         } else {
 593 #ifndef NO_OPENSSL
 594                 if (sort_list_in_merge_order(list, &process_commit)) {
 595                         die("merge order sort failed\n");
 596                 }
 597 #else
 598                 die("merge order sort unsupported, OpenSSL not linked");
 599 #endif
 600         }
 601
 602         return 0;
 603 }