rev-list.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "tag.h"
   4 #include "commit.h"
   5 #include "tree.h"
   6 #include "blob.h"
   7 #include "epoch.h"
   8
   9 #define SEEN            (1u << 0)
  10 #define INTERESTING     (1u << 1)
  11 #define COUNTED         (1u << 2)
  12 #define SHOWN           (1u << 3)
  13
  14 static const char rev_list_usage[] =
  15         "git-rev-list [OPTION] commit-id <commit-id>\n"
  16                       "  --max-count=nr\n"
  17                       "  --max-age=epoch\n"
  18                       "  --min-age=epoch\n"
  19                       "  --parents\n"
  20                       "  --bisect\n"
  21                       "  --objects\n"
  22                       "  --unpacked\n"
  23                       "  --header\n"
  24                       "  --pretty\n"
  25                       "  --no-merges\n"
  26                       "  --merge-order [ --show-breaks ]\n"
  27                       "  --topo-order";
  28
  29 static int unpacked = 0;
  30 static int bisect_list = 0;
  31 static int tag_objects = 0;
  32 static int tree_objects = 0;
  33 static int blob_objects = 0;
  34 static int verbose_header = 0;
  35 static int show_parents = 0;
  36 static int hdr_termination = 0;
  37 static const char *commit_prefix = "";
  38 static unsigned long max_age = -1;
  39 static unsigned long min_age = -1;
  40 static int max_count = -1;
  41 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  42 static int merge_order = 0;
  43 static int show_breaks = 0;
  44 static int stop_traversal = 0;
  45 static int topo_order = 0;
  46 static int no_merges = 0;
  47
  48 static void show_commit(struct commit *commit)
  49 {
  50         commit->object.flags |= SHOWN;
  51         if (show_breaks) {
  52                 commit_prefix = "| ";
  53                 if (commit->object.flags & DISCONTINUITY) {
  54                         commit_prefix = "^ ";
  55                 } else if (commit->object.flags & BOUNDARY) {
  56                         commit_prefix = "= ";
  57                 }
  58         }
  59         printf("%s%s", commit_prefix, sha1_to_hex(commit->object.sha1));
  60         if (show_parents) {
  61                 struct commit_list *parents = commit->parents;
  62                 while (parents) {
  63                         printf(" %s", sha1_to_hex(parents->item->object.sha1));
  64                         parents = parents->next;
  65                 }
  66         }
  67         if (commit_format == CMIT_FMT_ONELINE)
  68                 putchar(' ');
  69         else
  70                 putchar('\n');
  71
  72         if (verbose_header) {
  73                 static char pretty_header[16384];
  74                 pretty_print_commit(commit_format, commit->buffer, ~0, pretty_header, sizeof(pretty_header));
  75                 printf("%s%c", pretty_header, hdr_termination);
  76         }
  77         fflush(stdout);
  78 }
  79
  80 static int filter_commit(struct commit * commit)
  81 {
  82         if (stop_traversal && (commit->object.flags & BOUNDARY))
  83                 return STOP;
  84         if (commit->object.flags & (UNINTERESTING|SHOWN))
  85                 return CONTINUE;
  86         if (min_age != -1 && (commit->date > min_age))
  87                 return CONTINUE;
  88         if (max_age != -1 && (commit->date < max_age)) {
  89                 stop_traversal=1;
  90                 return CONTINUE;
  91         }
  92         if (max_count != -1 && !max_count--)
  93                 return STOP;
  94         if (no_merges && (commit->parents && commit->parents->next))
  95                 return CONTINUE;
  96         return DO;
  97 }
  98
  99 static int process_commit(struct commit * commit)
 100 {
 101         int action=filter_commit(commit);
 102
 103         if (action == STOP) {
 104                 return STOP;
 105         }
 106
 107         if (action == CONTINUE) {
 108                 return CONTINUE;
 109         }
 110
 111         show_commit(commit);
 112
 113         return CONTINUE;
 114 }
 115
 116 static struct object_list **add_object(struct object *obj, struct object_list **p, const char *name)
 117 {
 118         struct object_list *entry = xmalloc(sizeof(*entry));
 119         entry->item = obj;
 120         entry->next = *p;
 121         entry->name = name;
 122         *p = entry;
 123         return &entry->next;
 124 }
 125
 126 static struct object_list **process_blob(struct blob *blob, struct object_list **p, const char *name)
 127 {
 128         struct object *obj = &blob->object;
 129
 130         if (!blob_objects)
 131                 return p;
 132         if (obj->flags & (UNINTERESTING | SEEN))
 133                 return p;
 134         obj->flags |= SEEN;
 135         return add_object(obj, p, name);
 136 }
 137
 138 static struct object_list **process_tree(struct tree *tree, struct object_list **p, const char *name)
 139 {
 140         struct object *obj = &tree->object;
 141         struct tree_entry_list *entry;
 142
 143         if (!tree_objects)
 144                 return p;
 145         if (obj->flags & (UNINTERESTING | SEEN))
 146                 return p;
 147         if (parse_tree(tree) < 0)
 148                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 149         obj->flags |= SEEN;
 150         p = add_object(obj, p, name);
 151         entry = tree->entries;
 152         tree->entries = NULL;
 153         while (entry) {
 154                 struct tree_entry_list *next = entry->next;
 155                 if (entry->directory)
 156                         p = process_tree(entry->item.tree, p, entry->name);
 157                 else
 158                         p = process_blob(entry->item.blob, p, entry->name);
 159                 free(entry);
 160                 entry = next;
 161         }
 162         return p;
 163 }
 164
 165 static struct object_list *pending_objects = NULL;
 166
 167 static void show_commit_list(struct commit_list *list)
 168 {
 169         struct object_list *objects = NULL, **p = &objects, *pending;
 170         while (list) {
 171                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 172
 173                 p = process_tree(commit->tree, p, "");
 174                 if (process_commit(commit) == STOP)
 175                         break;
 176         }
 177         for (pending = pending_objects; pending; pending = pending->next) {
 178                 struct object *obj = pending->item;
 179                 const char *name = pending->name;
 180                 if (obj->flags & (UNINTERESTING | SEEN))
 181                         continue;
 182                 if (obj->type == tag_type) {
 183                         obj->flags |= SEEN;
 184                         p = add_object(obj, p, name);
 185                         continue;
 186                 }
 187                 if (obj->type == tree_type) {
 188                         p = process_tree((struct tree *)obj, p, name);
 189                         continue;
 190                 }
 191                 if (obj->type == blob_type) {
 192                         p = process_blob((struct blob *)obj, p, name);
 193                         continue;
 194                 }
 195                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 196         }
 197         while (objects) {
 198                 /* An object with name "foo\n0000000000000000000000000000000000000000"
 199                  * can be used confuse downstream git-pack-objects very badly.
 200                  */
 201                 const char *ep = strchr(objects->name, '\n');
 202                 if (ep) {
 203                         printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
 204                                (int) (ep - objects->name),
 205                                objects->name);
 206                 }
 207                 else
 208                         printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 209                 objects = objects->next;
 210         }
 211 }
 212
 213 static void mark_blob_uninteresting(struct blob *blob)
 214 {
 215         if (!blob_objects)
 216                 return;
 217         if (blob->object.flags & UNINTERESTING)
 218                 return;
 219         blob->object.flags |= UNINTERESTING;
 220 }
 221
 222 static void mark_tree_uninteresting(struct tree *tree)
 223 {
 224         struct object *obj = &tree->object;
 225         struct tree_entry_list *entry;
 226
 227         if (!tree_objects)
 228                 return;
 229         if (obj->flags & UNINTERESTING)
 230                 return;
 231         obj->flags |= UNINTERESTING;
 232         if (!has_sha1_file(obj->sha1))
 233                 return;
 234         if (parse_tree(tree) < 0)
 235                 die("bad tree %s", sha1_to_hex(obj->sha1));
 236         entry = tree->entries;
 237         tree->entries = NULL;
 238         while (entry) {
 239                 struct tree_entry_list *next = entry->next;
 240                 if (entry->directory)
 241                         mark_tree_uninteresting(entry->item.tree);
 242                 else
 243                         mark_blob_uninteresting(entry->item.blob);
 244                 free(entry);
 245                 entry = next;
 246         }
 247 }
 248
 249 static void mark_parents_uninteresting(struct commit *commit)
 250 {
 251         struct commit_list *parents = commit->parents;
 252
 253         while (parents) {
 254                 struct commit *commit = parents->item;
 255                 commit->object.flags |= UNINTERESTING;
 256
 257                 /*
 258                  * Normally we haven't parsed the parent
 259                  * yet, so we won't have a parent of a parent
 260                  * here. However, it may turn out that we've
 261                  * reached this commit some other way (where it
 262                  * wasn't uninteresting), in which case we need
 263                  * to mark its parents recursively too..
 264                  */
 265                 if (commit->parents)
 266                         mark_parents_uninteresting(commit);
 267
 268                 /*
 269                  * A missing commit is ok iff its parent is marked
 270                  * uninteresting.
 271                  *
 272                  * We just mark such a thing parsed, so that when
 273                  * it is popped next time around, we won't be trying
 274                  * to parse it and get an error.
 275                  */
 276                 if (!has_sha1_file(commit->object.sha1))
 277                         commit->object.parsed = 1;
 278                 parents = parents->next;
 279         }
 280 }
 281
 282 static int everybody_uninteresting(struct commit_list *orig)
 283 {
 284         struct commit_list *list = orig;
 285         while (list) {
 286                 struct commit *commit = list->item;
 287                 list = list->next;
 288                 if (commit->object.flags & UNINTERESTING)
 289                         continue;
 290                 return 0;
 291         }
 292         return 1;
 293 }
 294
 295 /*
 296  * This is a truly stupid algorithm, but it's only
 297  * used for bisection, and we just don't care enough.
 298  *
 299  * We care just barely enough to avoid recursing for
 300  * non-merge entries.
 301  */
 302 static int count_distance(struct commit_list *entry)
 303 {
 304         int nr = 0;
 305
 306         while (entry) {
 307                 struct commit *commit = entry->item;
 308                 struct commit_list *p;
 309
 310                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 311                         break;
 312                 nr++;
 313                 commit->object.flags |= COUNTED;
 314                 p = commit->parents;
 315                 entry = p;
 316                 if (p) {
 317                         p = p->next;
 318                         while (p) {
 319                                 nr += count_distance(p);
 320                                 p = p->next;
 321                         }
 322                 }
 323         }
 324         return nr;
 325 }
 326
 327 static void clear_distance(struct commit_list *list)
 328 {
 329         while (list) {
 330                 struct commit *commit = list->item;
 331                 commit->object.flags &= ~COUNTED;
 332                 list = list->next;
 333         }
 334 }
 335
 336 static struct commit_list *find_bisection(struct commit_list *list)
 337 {
 338         int nr, closest;
 339         struct commit_list *p, *best;
 340
 341         nr = 0;
 342         p = list;
 343         while (p) {
 344                 nr++;
 345                 p = p->next;
 346         }
 347         closest = 0;
 348         best = list;
 349
 350         p = list;
 351         while (p) {
 352                 int distance = count_distance(p);
 353                 clear_distance(list);
 354                 if (nr - distance < distance)
 355                         distance = nr - distance;
 356                 if (distance > closest) {
 357                         best = p;
 358                         closest = distance;
 359                 }
 360                 p = p->next;
 361         }
 362         if (best)
 363                 best->next = NULL;
 364         return best;
 365 }
 366
 367 static void mark_edges_uninteresting(struct commit_list *list)
 368 {
 369         for ( ; list; list = list->next) {
 370                 struct commit_list *parents = list->item->parents;
 371
 372                 for ( ; parents; parents = parents->next) {
 373                         struct commit *commit = parents->item;
 374                         if (commit->object.flags & UNINTERESTING)
 375                                 mark_tree_uninteresting(commit->tree);
 376                 }
 377         }
 378 }
 379
 380 static struct commit_list *limit_list(struct commit_list *list)
 381 {
 382         struct commit_list *newlist = NULL;
 383         struct commit_list **p = &newlist;
 384         while (list) {
 385                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 386                 struct object *obj = &commit->object;
 387
 388                 if (max_age != -1 && (commit->date < max_age))
 389                         obj->flags |= UNINTERESTING;
 390                 if (unpacked && has_sha1_pack(obj->sha1))
 391                         obj->flags |= UNINTERESTING;
 392                 if (obj->flags & UNINTERESTING) {
 393                         mark_parents_uninteresting(commit);
 394                         if (everybody_uninteresting(list))
 395                                 break;
 396                         continue;
 397                 }
 398                 if (min_age != -1 && (commit->date > min_age))
 399                         continue;
 400                 p = &commit_list_insert(commit, p)->next;
 401         }
 402         if (tree_objects)
 403                 mark_edges_uninteresting(newlist);
 404         if (bisect_list)
 405                 newlist = find_bisection(newlist);
 406         return newlist;
 407 }
 408
 409 static void add_pending_object(struct object *obj, const char *name)
 410 {
 411         add_object(obj, &pending_objects, name);
 412 }
 413
 414 static struct commit *get_commit_reference(const char *name, unsigned int flags)
 415 {
 416         unsigned char sha1[20];
 417         struct object *object;
 418
 419         if (get_sha1(name, sha1))
 420                 usage(rev_list_usage);
 421         object = parse_object(sha1);
 422         if (!object)
 423                 die("bad object %s", name);
 424
 425         /*
 426          * Tag object? Look what it points to..
 427          */
 428         while (object->type == tag_type) {
 429                 struct tag *tag = (struct tag *) object;
 430                 object->flags |= flags;
 431                 if (tag_objects && !(object->flags & UNINTERESTING))
 432                         add_pending_object(object, tag->tag);
 433                 object = parse_object(tag->tagged->sha1);
 434                 if (!object)
 435                         die("bad object %s", sha1_to_hex(tag->tagged->sha1));
 436         }
 437
 438         /*
 439          * Commit object? Just return it, we'll do all the complex
 440          * reachability crud.
 441          */
 442         if (object->type == commit_type) {
 443                 struct commit *commit = (struct commit *)object;
 444                 object->flags |= flags;
 445                 if (parse_commit(commit) < 0)
 446                         die("unable to parse commit %s", name);
 447                 if (flags & UNINTERESTING)
 448                         mark_parents_uninteresting(commit);
 449                 return commit;
 450         }
 451
 452         /*
 453          * Tree object? Either mark it uniniteresting, or add it
 454          * to the list of objects to look at later..
 455          */
 456         if (object->type == tree_type) {
 457                 struct tree *tree = (struct tree *)object;
 458                 if (!tree_objects)
 459                         return NULL;
 460                 if (flags & UNINTERESTING) {
 461                         mark_tree_uninteresting(tree);
 462                         return NULL;
 463                 }
 464                 add_pending_object(object, "");
 465                 return NULL;
 466         }
 467
 468         /*
 469          * Blob object? You know the drill by now..
 470          */
 471         if (object->type == blob_type) {
 472                 struct blob *blob = (struct blob *)object;
 473                 if (!blob_objects)
 474                         return NULL;
 475                 if (flags & UNINTERESTING) {
 476                         mark_blob_uninteresting(blob);
 477                         return NULL;
 478                 }
 479                 add_pending_object(object, "");
 480                 return NULL;
 481         }
 482         die("%s is unknown object", name);
 483 }
 484
 485 static void handle_one_commit(struct commit *com, struct commit_list **lst)
 486 {
 487         if (!com || com->object.flags & SEEN)
 488                 return;
 489         com->object.flags |= SEEN;
 490         commit_list_insert(com, lst);
 491 }
 492
 493 /* for_each_ref() callback does not allow user data -- Yuck. */
 494 static struct commit_list **global_lst;
 495
 496 static int include_one_commit(const char *path, const unsigned char *sha1)
 497 {
 498         struct commit *com = get_commit_reference(path, 0);
 499         handle_one_commit(com, global_lst);
 500         return 0;
 501 }
 502
 503 static void handle_all(struct commit_list **lst)
 504 {
 505         global_lst = lst;
 506         for_each_ref(include_one_commit);
 507         global_lst = NULL;
 508 }
 509
 510 int main(int argc, char **argv)
 511 {
 512         struct commit_list *list = NULL;
 513         int i, limited = 0;
 514
 515         setup_git_directory();
 516         for (i = 1 ; i < argc; i++) {
 517                 int flags;
 518                 char *arg = argv[i];
 519                 char *dotdot;
 520                 struct commit *commit;
 521
 522                 if (!strncmp(arg, "--max-count=", 12)) {
 523                         max_count = atoi(arg + 12);
 524                         continue;
 525                 }
 526                 if (!strncmp(arg, "--max-age=", 10)) {
 527                         max_age = atoi(arg + 10);
 528                         limited = 1;
 529                         continue;
 530                 }
 531                 if (!strncmp(arg, "--min-age=", 10)) {
 532                         min_age = atoi(arg + 10);
 533                         limited = 1;
 534                         continue;
 535                 }
 536                 if (!strcmp(arg, "--header")) {
 537                         verbose_header = 1;
 538                         continue;
 539                 }
 540                 if (!strncmp(arg, "--pretty", 8)) {
 541                         commit_format = get_commit_format(arg+8);
 542                         verbose_header = 1;
 543                         hdr_termination = '\n';
 544                         if (commit_format == CMIT_FMT_ONELINE)
 545                                 commit_prefix = "";
 546                         else
 547                                 commit_prefix = "commit ";
 548                         continue;
 549                 }
 550                 if (!strncmp(arg, "--no-merges", 11)) {
 551                         no_merges = 1;
 552                         continue;
 553                 }
 554                 if (!strcmp(arg, "--parents")) {
 555                         show_parents = 1;
 556                         continue;
 557                 }
 558                 if (!strcmp(arg, "--bisect")) {
 559                         bisect_list = 1;
 560                         continue;
 561                 }
 562                 if (!strcmp(arg, "--all")) {
 563                         handle_all(&list);
 564                         continue;
 565                 }
 566                 if (!strcmp(arg, "--objects")) {
 567                         tag_objects = 1;
 568                         tree_objects = 1;
 569                         blob_objects = 1;
 570                         continue;
 571                 }
 572                 if (!strcmp(arg, "--unpacked")) {
 573                         unpacked = 1;
 574                         limited = 1;
 575                         continue;
 576                 }
 577                 if (!strcmp(arg, "--merge-order")) {
 578                         merge_order = 1;
 579                         continue;
 580                 }
 581                 if (!strcmp(arg, "--show-breaks")) {
 582                         show_breaks = 1;
 583                         continue;
 584                 }
 585                 if (!strcmp(arg, "--topo-order")) {
 586                         topo_order = 1;
 587                         limited = 1;
 588                         continue;
 589                 }
 590
 591                 if (show_breaks && !merge_order)
 592                         usage(rev_list_usage);
 593
 594                 flags = 0;
 595                 dotdot = strstr(arg, "..");
 596                 if (dotdot) {
 597                         char *next = dotdot + 2;
 598                         struct commit *exclude = NULL;
 599                         struct commit *include = NULL;
 600                         *dotdot = 0;
 601                         if (!*next)
 602                                 next = "HEAD";
 603                         exclude = get_commit_reference(arg, UNINTERESTING);
 604                         include = get_commit_reference(next, 0);
 605                         if (exclude && include) {
 606                                 limited = 1;
 607                                 handle_one_commit(exclude, &list);
 608                                 handle_one_commit(include, &list);
 609                                 continue;
 610                         }
 611                         *dotdot = '.';
 612                 }
 613                 if (*arg == '^') {
 614                         flags = UNINTERESTING;
 615                         arg++;
 616                         limited = 1;
 617                 }
 618                 commit = get_commit_reference(arg, flags);
 619                 handle_one_commit(commit, &list);
 620         }
 621
 622         save_commit_buffer = verbose_header;
 623         track_object_refs = 0;
 624
 625         if (!merge_order) {
 626                 sort_by_date(&list);
 627                 if (list && !limited && max_count == 1 &&
 628                     !tag_objects && !tree_objects && !blob_objects) {
 629                         show_commit(list->item);
 630                         return 0;
 631                 }
 632                 if (limited)
 633                         list = limit_list(list);
 634                 if (topo_order)
 635                         sort_in_topological_order(&list);
 636                 show_commit_list(list);
 637         } else {
 638 #ifndef NO_OPENSSL
 639                 if (sort_list_in_merge_order(list, &process_commit)) {
 640                         die("merge order sort failed\n");
 641                 }
 642 #else
 643                 die("merge order sort unsupported, OpenSSL not linked");
 644 #endif
 645         }
 646
 647         return 0;
 648 }