builtin/describe.c

   1 #define USE_THE_INDEX_COMPATIBILITY_MACROS
   2 #include "cache.h"
   3 #include "config.h"
   4 #include "lockfile.h"
   5 #include "commit.h"
   6 #include "tag.h"
   7 #include "blob.h"
   8 #include "refs.h"
   9 #include "builtin.h"
  10 #include "exec-cmd.h"
  11 #include "parse-options.h"
  12 #include "revision.h"
  13 #include "diff.h"
  14 #include "hashmap.h"
  15 #include "strvec.h"
  16 #include "run-command.h"
  17 #include "object-store.h"
  18 #include "list-objects.h"
  19 #include "commit-slab.h"
  20
  21 #define MAX_TAGS        (FLAG_BITS - 1)
  22
  23 define_commit_slab(commit_names, struct commit_name *);
  24
  25 static const char * const describe_usage[] = {
  26         N_("git describe [<options>] [<commit-ish>...]"),
  27         N_("git describe [<options>] --dirty"),
  28         NULL
  29 };
  30
  31 static int debug;       /* Display lots of verbose info */
  32 static int all; /* Any valid ref can be used */
  33 static int tags;        /* Allow lightweight tags */
  34 static int longformat;
  35 static int first_parent;
  36 static int abbrev = -1; /* unspecified */
  37 static int max_candidates = 10;
  38 static struct hashmap names;
  39 static int have_util;
  40 static struct string_list patterns = STRING_LIST_INIT_NODUP;
  41 static struct string_list exclude_patterns = STRING_LIST_INIT_NODUP;
  42 static int always;
  43 static const char *suffix, *dirty, *broken;
  44 static struct commit_names commit_names;
  45
  46 /* diff-index command arguments to check if working tree is dirty. */
  47 static const char *diff_index_args[] = {
  48         "diff-index", "--quiet", "HEAD", "--", NULL
  49 };
  50
  51 struct commit_name {
  52         struct hashmap_entry entry;
  53         struct object_id peeled;
  54         struct tag *tag;
  55         unsigned prio:2; /* annotated tag = 2, tag = 1, head = 0 */
  56         unsigned name_checked:1;
  57         unsigned misnamed:1;
  58         struct object_id oid;
  59         char *path;
  60 };
  61
  62 static const char *prio_names[] = {
  63         N_("head"), N_("lightweight"), N_("annotated"),
  64 };
  65
  66 static int commit_name_neq(const void *unused_cmp_data,
  67                            const struct hashmap_entry *eptr,
  68                            const struct hashmap_entry *entry_or_key,
  69                            const void *peeled)
  70 {
  71         const struct commit_name *cn1, *cn2;
  72
  73         cn1 = container_of(eptr, const struct commit_name, entry);
  74         cn2 = container_of(entry_or_key, const struct commit_name, entry);
  75
  76         return !oideq(&cn1->peeled, peeled ? peeled : &cn2->peeled);
  77 }
  78
  79 static inline struct commit_name *find_commit_name(const struct object_id *peeled)
  80 {
  81         return hashmap_get_entry_from_hash(&names, oidhash(peeled), peeled,
  82                                                 struct commit_name, entry);
  83 }
  84
  85 static int replace_name(struct commit_name *e,
  86                                int prio,
  87                                const struct object_id *oid,
  88                                struct tag **tag)
  89 {
  90         if (!e || e->prio < prio)
  91                 return 1;
  92
  93         if (e->prio == 2 && prio == 2) {
  94                 /* Multiple annotated tags point to the same commit.
  95                  * Select one to keep based upon their tagger date.
  96                  */
  97                 struct tag *t;
  98
  99                 if (!e->tag) {
 100                         t = lookup_tag(the_repository, &e->oid);
 101                         if (!t || parse_tag(t))
 102                                 return 1;
 103                         e->tag = t;
 104                 }
 105
 106                 t = lookup_tag(the_repository, oid);
 107                 if (!t || parse_tag(t))
 108                         return 0;
 109                 *tag = t;
 110
 111                 if (e->tag->date < t->date)
 112                         return 1;
 113         }
 114
 115         return 0;
 116 }
 117
 118 static void add_to_known_names(const char *path,
 119                                const struct object_id *peeled,
 120                                int prio,
 121                                const struct object_id *oid)
 122 {
 123         struct commit_name *e = find_commit_name(peeled);
 124         struct tag *tag = NULL;
 125         if (replace_name(e, prio, oid, &tag)) {
 126                 if (!e) {
 127                         e = xmalloc(sizeof(struct commit_name));
 128                         oidcpy(&e->peeled, peeled);
 129                         hashmap_entry_init(&e->entry, oidhash(peeled));
 130                         hashmap_add(&names, &e->entry);
 131                         e->path = NULL;
 132                 }
 133                 e->tag = tag;
 134                 e->prio = prio;
 135                 e->name_checked = 0;
 136                 e->misnamed = 0;
 137                 oidcpy(&e->oid, oid);
 138                 free(e->path);
 139                 e->path = xstrdup(path);
 140         }
 141 }
 142
 143 static int get_name(const char *path, const struct object_id *oid, int flag, void *cb_data)
 144 {
 145         int is_tag = 0;
 146         struct object_id peeled;
 147         int is_annotated, prio;
 148         const char *path_to_match = NULL;
 149
 150         if (skip_prefix(path, "refs/tags/", &path_to_match)) {
 151                 is_tag = 1;
 152         } else if (all) {
 153                 if ((exclude_patterns.nr || patterns.nr) &&
 154                     !skip_prefix(path, "refs/heads/", &path_to_match) &&
 155                     !skip_prefix(path, "refs/remotes/", &path_to_match)) {
 156                         /* Only accept reference of known type if there are match/exclude patterns */
 157                         return 0;
 158                 }
 159         } else {
 160                 /* Reject anything outside refs/tags/ unless --all */
 161                 return 0;
 162         }
 163
 164         /*
 165          * If we're given exclude patterns, first exclude any tag which match
 166          * any of the exclude pattern.
 167          */
 168         if (exclude_patterns.nr) {
 169                 struct string_list_item *item;
 170
 171                 for_each_string_list_item(item, &exclude_patterns) {
 172                         if (!wildmatch(item->string, path_to_match, 0))
 173                                 return 0;
 174                 }
 175         }
 176
 177         /*
 178          * If we're given patterns, accept only tags which match at least one
 179          * pattern.
 180          */
 181         if (patterns.nr) {
 182                 int found = 0;
 183                 struct string_list_item *item;
 184
 185                 for_each_string_list_item(item, &patterns) {
 186                         if (!wildmatch(item->string, path_to_match, 0)) {
 187                                 found = 1;
 188                                 break;
 189                         }
 190                 }
 191
 192                 if (!found)
 193                         return 0;
 194         }
 195
 196         /* Is it annotated? */
 197         if (!peel_iterated_oid(oid, &peeled)) {
 198                 is_annotated = !oideq(oid, &peeled);
 199         } else {
 200                 oidcpy(&peeled, oid);
 201                 is_annotated = 0;
 202         }
 203
 204         /*
 205          * By default, we only use annotated tags, but with --tags
 206          * we fall back to lightweight ones (even without --tags,
 207          * we still remember lightweight ones, only to give hints
 208          * in an error message).  --all allows any refs to be used.
 209          */
 210         if (is_annotated)
 211                 prio = 2;
 212         else if (is_tag)
 213                 prio = 1;
 214         else
 215                 prio = 0;
 216
 217         add_to_known_names(all ? path + 5 : path + 10, &peeled, prio, oid);
 218         return 0;
 219 }
 220
 221 struct possible_tag {
 222         struct commit_name *name;
 223         int depth;
 224         int found_order;
 225         unsigned flag_within;
 226 };
 227
 228 static int compare_pt(const void *a_, const void *b_)
 229 {
 230         struct possible_tag *a = (struct possible_tag *)a_;
 231         struct possible_tag *b = (struct possible_tag *)b_;
 232         if (a->depth != b->depth)
 233                 return a->depth - b->depth;
 234         if (a->found_order != b->found_order)
 235                 return a->found_order - b->found_order;
 236         return 0;
 237 }
 238
 239 static unsigned long finish_depth_computation(
 240         struct commit_list **list,
 241         struct possible_tag *best)
 242 {
 243         unsigned long seen_commits = 0;
 244         while (*list) {
 245                 struct commit *c = pop_commit(list);
 246                 struct commit_list *parents = c->parents;
 247                 seen_commits++;
 248                 if (c->object.flags & best->flag_within) {
 249                         struct commit_list *a = *list;
 250                         while (a) {
 251                                 struct commit *i = a->item;
 252                                 if (!(i->object.flags & best->flag_within))
 253                                         break;
 254                                 a = a->next;
 255                         }
 256                         if (!a)
 257                                 break;
 258                 } else
 259                         best->depth++;
 260                 while (parents) {
 261                         struct commit *p = parents->item;
 262                         parse_commit(p);
 263                         if (!(p->object.flags & SEEN))
 264                                 commit_list_insert_by_date(p, list);
 265                         p->object.flags |= c->object.flags;
 266                         parents = parents->next;
 267                 }
 268         }
 269         return seen_commits;
 270 }
 271
 272 static void append_name(struct commit_name *n, struct strbuf *dst)
 273 {
 274         if (n->prio == 2 && !n->tag) {
 275                 n->tag = lookup_tag(the_repository, &n->oid);
 276                 if (!n->tag || parse_tag(n->tag))
 277                         die(_("annotated tag %s not available"), n->path);
 278         }
 279         if (n->tag && !n->name_checked) {
 280                 if (strcmp(n->tag->tag, all ? n->path + 5 : n->path)) {
 281                         warning(_("tag '%s' is externally known as '%s'"),
 282                                 n->path, n->tag->tag);
 283                         n->misnamed = 1;
 284                 }
 285                 n->name_checked = 1;
 286         }
 287
 288         if (n->tag) {
 289                 if (all)
 290                         strbuf_addstr(dst, "tags/");
 291                 strbuf_addstr(dst, n->tag->tag);
 292         } else {
 293                 strbuf_addstr(dst, n->path);
 294         }
 295 }
 296
 297 static void append_suffix(int depth, const struct object_id *oid, struct strbuf *dst)
 298 {
 299         strbuf_addf(dst, "-%d-g%s", depth, find_unique_abbrev(oid, abbrev));
 300 }
 301
 302 static void describe_commit(struct object_id *oid, struct strbuf *dst)
 303 {
 304         struct commit *cmit, *gave_up_on = NULL;
 305         struct commit_list *list;
 306         struct commit_name *n;
 307         struct possible_tag all_matches[MAX_TAGS];
 308         unsigned int match_cnt = 0, annotated_cnt = 0, cur_match;
 309         unsigned long seen_commits = 0;
 310         unsigned int unannotated_cnt = 0;
 311
 312         cmit = lookup_commit_reference(the_repository, oid);
 313
 314         n = find_commit_name(&cmit->object.oid);
 315         if (n && (tags || all || n->prio == 2)) {
 316                 /*
 317                  * Exact match to an existing ref.
 318                  */
 319                 append_name(n, dst);
 320                 if (n->misnamed || longformat)
 321                         append_suffix(0, n->tag ? get_tagged_oid(n->tag) : oid, dst);
 322                 if (suffix)
 323                         strbuf_addstr(dst, suffix);
 324                 return;
 325         }
 326
 327         if (!max_candidates)
 328                 die(_("no tag exactly matches '%s'"), oid_to_hex(&cmit->object.oid));
 329         if (debug)
 330                 fprintf(stderr, _("No exact match on refs or tags, searching to describe\n"));
 331
 332         if (!have_util) {
 333                 struct hashmap_iter iter;
 334                 struct commit *c;
 335                 struct commit_name *n;
 336
 337                 init_commit_names(&commit_names);
 338                 hashmap_for_each_entry(&names, &iter, n,
 339                                         entry /* member name */) {
 340                         c = lookup_commit_reference_gently(the_repository,
 341                                                            &n->peeled, 1);
 342                         if (c)
 343                                 *commit_names_at(&commit_names, c) = n;
 344                 }
 345                 have_util = 1;
 346         }
 347
 348         list = NULL;
 349         cmit->object.flags = SEEN;
 350         commit_list_insert(cmit, &list);
 351         while (list) {
 352                 struct commit *c = pop_commit(&list);
 353                 struct commit_list *parents = c->parents;
 354                 struct commit_name **slot;
 355
 356                 seen_commits++;
 357                 slot = commit_names_peek(&commit_names, c);
 358                 n = slot ? *slot : NULL;
 359                 if (n) {
 360                         if (!tags && !all && n->prio < 2) {
 361                                 unannotated_cnt++;
 362                         } else if (match_cnt < max_candidates) {
 363                                 struct possible_tag *t = &all_matches[match_cnt++];
 364                                 t->name = n;
 365                                 t->depth = seen_commits - 1;
 366                                 t->flag_within = 1u << match_cnt;
 367                                 t->found_order = match_cnt;
 368                                 c->object.flags |= t->flag_within;
 369                                 if (n->prio == 2)
 370                                         annotated_cnt++;
 371                         }
 372                         else {
 373                                 gave_up_on = c;
 374                                 break;
 375                         }
 376                 }
 377                 for (cur_match = 0; cur_match < match_cnt; cur_match++) {
 378                         struct possible_tag *t = &all_matches[cur_match];
 379                         if (!(c->object.flags & t->flag_within))
 380                                 t->depth++;
 381                 }
 382                 /* Stop if last remaining path already covered by best candidate(s) */
 383                 if (annotated_cnt && !list) {
 384                         int best_depth = INT_MAX;
 385                         unsigned best_within = 0;
 386                         for (cur_match = 0; cur_match < match_cnt; cur_match++) {
 387                                 struct possible_tag *t = &all_matches[cur_match];
 388                                 if (t->depth < best_depth) {
 389                                         best_depth = t->depth;
 390                                         best_within = t->flag_within;
 391                                 } else if (t->depth == best_depth) {
 392                                         best_within |= t->flag_within;
 393                                 }
 394                         }
 395                         if ((c->object.flags & best_within) == best_within) {
 396                                 if (debug)
 397                                         fprintf(stderr, _("finished search at %s\n"),
 398                                                 oid_to_hex(&c->object.oid));
 399                                 break;
 400                         }
 401                 }
 402                 while (parents) {
 403                         struct commit *p = parents->item;
 404                         parse_commit(p);
 405                         if (!(p->object.flags & SEEN))
 406                                 commit_list_insert_by_date(p, &list);
 407                         p->object.flags |= c->object.flags;
 408                         parents = parents->next;
 409
 410                         if (first_parent)
 411                                 break;
 412                 }
 413         }
 414
 415         if (!match_cnt) {
 416                 struct object_id *cmit_oid = &cmit->object.oid;
 417                 if (always) {
 418                         strbuf_add_unique_abbrev(dst, cmit_oid, abbrev);
 419                         if (suffix)
 420                                 strbuf_addstr(dst, suffix);
 421                         return;
 422                 }
 423                 if (unannotated_cnt)
 424                         die(_("No annotated tags can describe '%s'.\n"
 425                             "However, there were unannotated tags: try --tags."),
 426                             oid_to_hex(cmit_oid));
 427                 else
 428                         die(_("No tags can describe '%s'.\n"
 429                             "Try --always, or create some tags."),
 430                             oid_to_hex(cmit_oid));
 431         }
 432
 433         QSORT(all_matches, match_cnt, compare_pt);
 434
 435         if (gave_up_on) {
 436                 commit_list_insert_by_date(gave_up_on, &list);
 437                 seen_commits--;
 438         }
 439         seen_commits += finish_depth_computation(&list, &all_matches[0]);
 440         free_commit_list(list);
 441
 442         if (debug) {
 443                 static int label_width = -1;
 444                 if (label_width < 0) {
 445                         int i, w;
 446                         for (i = 0; i < ARRAY_SIZE(prio_names); i++) {
 447                                 w = strlen(_(prio_names[i]));
 448                                 if (label_width < w)
 449                                         label_width = w;
 450                         }
 451                 }
 452                 for (cur_match = 0; cur_match < match_cnt; cur_match++) {
 453                         struct possible_tag *t = &all_matches[cur_match];
 454                         fprintf(stderr, " %-*s %8d %s\n",
 455                                 label_width, _(prio_names[t->name->prio]),
 456                                 t->depth, t->name->path);
 457                 }
 458                 fprintf(stderr, _("traversed %lu commits\n"), seen_commits);
 459                 if (gave_up_on) {
 460                         fprintf(stderr,
 461                                 _("more than %i tags found; listed %i most recent\n"
 462                                 "gave up search at %s\n"),
 463                                 max_candidates, max_candidates,
 464                                 oid_to_hex(&gave_up_on->object.oid));
 465                 }
 466         }
 467
 468         append_name(all_matches[0].name, dst);
 469         if (all_matches[0].name->misnamed || abbrev)
 470                 append_suffix(all_matches[0].depth, &cmit->object.oid, dst);
 471         if (suffix)
 472                 strbuf_addstr(dst, suffix);
 473 }
 474
 475 struct process_commit_data {
 476         struct object_id current_commit;
 477         struct object_id looking_for;
 478         struct strbuf *dst;
 479         struct rev_info *revs;
 480 };
 481
 482 static void process_commit(struct commit *commit, void *data)
 483 {
 484         struct process_commit_data *pcd = data;
 485         pcd->current_commit = commit->object.oid;
 486 }
 487
 488 static void process_object(struct object *obj, const char *path, void *data)
 489 {
 490         struct process_commit_data *pcd = data;
 491
 492         if (oideq(&pcd->looking_for, &obj->oid) && !pcd->dst->len) {
 493                 reset_revision_walk();
 494                 describe_commit(&pcd->current_commit, pcd->dst);
 495                 strbuf_addf(pcd->dst, ":%s", path);
 496                 free_commit_list(pcd->revs->commits);
 497                 pcd->revs->commits = NULL;
 498         }
 499 }
 500
 501 static void describe_blob(struct object_id oid, struct strbuf *dst)
 502 {
 503         struct rev_info revs;
 504         struct strvec args = STRVEC_INIT;
 505         struct process_commit_data pcd = { null_oid, oid, dst, &revs};
 506
 507         strvec_pushl(&args, "internal: The first arg is not parsed",
 508                      "--objects", "--in-commit-order", "--reverse", "HEAD",
 509                      NULL);
 510
 511         repo_init_revisions(the_repository, &revs, NULL);
 512         if (setup_revisions(args.nr, args.v, &revs, NULL) > 1)
 513                 BUG("setup_revisions could not handle all args?");
 514
 515         if (prepare_revision_walk(&revs))
 516                 die("revision walk setup failed");
 517
 518         traverse_commit_list(&revs, process_commit, process_object, &pcd);
 519         reset_revision_walk();
 520 }
 521
 522 static void describe(const char *arg, int last_one)
 523 {
 524         struct object_id oid;
 525         struct commit *cmit;
 526         struct strbuf sb = STRBUF_INIT;
 527
 528         if (debug)
 529                 fprintf(stderr, _("describe %s\n"), arg);
 530
 531         if (get_oid(arg, &oid))
 532                 die(_("Not a valid object name %s"), arg);
 533         cmit = lookup_commit_reference_gently(the_repository, &oid, 1);
 534
 535         if (cmit)
 536                 describe_commit(&oid, &sb);
 537         else if (oid_object_info(the_repository, &oid, NULL) == OBJ_BLOB)
 538                 describe_blob(oid, &sb);
 539         else
 540                 die(_("%s is neither a commit nor blob"), arg);
 541
 542         puts(sb.buf);
 543
 544         if (!last_one)
 545                 clear_commit_marks(cmit, -1);
 546
 547         strbuf_release(&sb);
 548 }
 549
 550 int cmd_describe(int argc, const char **argv, const char *prefix)
 551 {
 552         int contains = 0;
 553         struct option options[] = {
 554                 OPT_BOOL(0, "contains",   &contains, N_("find the tag that comes after the commit")),
 555                 OPT_BOOL(0, "debug",      &debug, N_("debug search strategy on stderr")),
 556                 OPT_BOOL(0, "all",        &all, N_("use any ref")),
 557                 OPT_BOOL(0, "tags",       &tags, N_("use any tag, even unannotated")),
 558                 OPT_BOOL(0, "long",       &longformat, N_("always use long format")),
 559                 OPT_BOOL(0, "first-parent", &first_parent, N_("only follow first parent")),
 560                 OPT__ABBREV(&abbrev),
 561                 OPT_SET_INT(0, "exact-match", &max_candidates,
 562                             N_("only output exact matches"), 0),
 563                 OPT_INTEGER(0, "candidates", &max_candidates,
 564                             N_("consider <n> most recent tags (default: 10)")),
 565                 OPT_STRING_LIST(0, "match", &patterns, N_("pattern"),
 566                            N_("only consider tags matching <pattern>")),
 567                 OPT_STRING_LIST(0, "exclude", &exclude_patterns, N_("pattern"),
 568                            N_("do not consider tags matching <pattern>")),
 569                 OPT_BOOL(0, "always",        &always,
 570                         N_("show abbreviated commit object as fallback")),
 571                 {OPTION_STRING, 0, "dirty",  &dirty, N_("mark"),
 572                         N_("append <mark> on dirty working tree (default: \"-dirty\")"),
 573                         PARSE_OPT_OPTARG, NULL, (intptr_t) "-dirty"},
 574                 {OPTION_STRING, 0, "broken",  &broken, N_("mark"),
 575                         N_("append <mark> on broken working tree (default: \"-broken\")"),
 576                         PARSE_OPT_OPTARG, NULL, (intptr_t) "-broken"},
 577                 OPT_END(),
 578         };
 579
 580         git_config(git_default_config, NULL);
 581         argc = parse_options(argc, argv, prefix, options, describe_usage, 0);
 582         if (abbrev < 0)
 583                 abbrev = DEFAULT_ABBREV;
 584
 585         if (max_candidates < 0)
 586                 max_candidates = 0;
 587         else if (max_candidates > MAX_TAGS)
 588                 max_candidates = MAX_TAGS;
 589
 590         save_commit_buffer = 0;
 591
 592         if (longformat && abbrev == 0)
 593                 die(_("--long is incompatible with --abbrev=0"));
 594
 595         if (contains) {
 596                 struct string_list_item *item;
 597                 struct strvec args;
 598
 599                 strvec_init(&args);
 600                 strvec_pushl(&args, "name-rev",
 601                              "--peel-tag", "--name-only", "--no-undefined",
 602                              NULL);
 603                 if (always)
 604                         strvec_push(&args, "--always");
 605                 if (!all) {
 606                         strvec_push(&args, "--tags");
 607                         for_each_string_list_item(item, &patterns)
 608                                 strvec_pushf(&args, "--refs=refs/tags/%s", item->string);
 609                         for_each_string_list_item(item, &exclude_patterns)
 610                                 strvec_pushf(&args, "--exclude=refs/tags/%s", item->string);
 611                 }
 612                 if (argc)
 613                         strvec_pushv(&args, argv);
 614                 else
 615                         strvec_push(&args, "HEAD");
 616                 return cmd_name_rev(args.nr, args.v, prefix);
 617         }
 618
 619         hashmap_init(&names, commit_name_neq, NULL, 0);
 620         for_each_rawref(get_name, NULL);
 621         if (!hashmap_get_size(&names) && !always)
 622                 die(_("No names found, cannot describe anything."));
 623
 624         if (argc == 0) {
 625                 if (broken) {
 626                         struct child_process cp = CHILD_PROCESS_INIT;
 627                         strvec_pushv(&cp.args, diff_index_args);
 628                         cp.git_cmd = 1;
 629                         cp.no_stdin = 1;
 630                         cp.no_stdout = 1;
 631
 632                         if (!dirty)
 633                                 dirty = "-dirty";
 634
 635                         switch (run_command(&cp)) {
 636                         case 0:
 637                                 suffix = NULL;
 638                                 break;
 639                         case 1:
 640                                 suffix = dirty;
 641                                 break;
 642                         default:
 643                                 /* diff-index aborted abnormally */
 644                                 suffix = broken;
 645                         }
 646                 } else if (dirty) {
 647                         struct lock_file index_lock = LOCK_INIT;
 648                         struct rev_info revs;
 649                         struct strvec args = STRVEC_INIT;
 650                         int fd, result;
 651
 652                         setup_work_tree();
 653                         read_cache();
 654                         refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED,
 655                                       NULL, NULL, NULL);
 656                         fd = hold_locked_index(&index_lock, 0);
 657                         if (0 <= fd)
 658                                 repo_update_index_if_able(the_repository, &index_lock);
 659
 660                         repo_init_revisions(the_repository, &revs, prefix);
 661                         strvec_pushv(&args, diff_index_args);
 662                         if (setup_revisions(args.nr, args.v, &revs, NULL) != 1)
 663                                 BUG("malformed internal diff-index command line");
 664                         result = run_diff_index(&revs, 0);
 665
 666                         if (!diff_result_code(&revs.diffopt, result))
 667                                 suffix = NULL;
 668                         else
 669                                 suffix = dirty;
 670                 }
 671                 describe("HEAD", 1);
 672         } else if (dirty) {
 673                 die(_("--dirty is incompatible with commit-ishes"));
 674         } else if (broken) {
 675                 die(_("--broken is incompatible with commit-ishes"));
 676         } else {
 677                 while (argc-- > 0)
 678                         describe(*argv++, argc == 0);
 679         }
 680         return 0;
 681 }