builtin/describe.c

   1 #define USE_THE_INDEX_VARIABLE
   2 #include "cache.h"
   3 #include "config.h"
   4 #include "gettext.h"
   5 #include "hex.h"
   6 #include "lockfile.h"
   7 #include "commit.h"
   8 #include "tag.h"
   9 #include "blob.h"
  10 #include "refs.h"
  11 #include "builtin.h"
  12 #include "exec-cmd.h"
  13 #include "parse-options.h"
  14 #include "revision.h"
  15 #include "diff.h"
  16 #include "hashmap.h"
  17 #include "strvec.h"
  18 #include "run-command.h"
  19 #include "object-store.h"
  20 #include "list-objects.h"
  21 #include "commit-slab.h"
  22
  23 #define MAX_TAGS        (FLAG_BITS - 1)
  24
  25 define_commit_slab(commit_names, struct commit_name *);
  26
  27 static const char * const describe_usage[] = {
  28         N_("git describe [--all] [--tags] [--contains] [--abbrev=<n>] [<commit-ish>...]"),
  29         N_("git describe [--all] [--tags] [--contains] [--abbrev=<n>] --dirty[=<mark>]"),
  30         N_("git describe <blob>"),
  31         NULL
  32 };
  33
  34 static int debug;       /* Display lots of verbose info */
  35 static int all; /* Any valid ref can be used */
  36 static int tags;        /* Allow lightweight tags */
  37 static int longformat;
  38 static int first_parent;
  39 static int abbrev = -1; /* unspecified */
  40 static int max_candidates = 10;
  41 static struct hashmap names;
  42 static int have_util;
  43 static struct string_list patterns = STRING_LIST_INIT_NODUP;
  44 static struct string_list exclude_patterns = STRING_LIST_INIT_NODUP;
  45 static int always;
  46 static const char *suffix, *dirty, *broken;
  47 static struct commit_names commit_names;
  48
  49 /* diff-index command arguments to check if working tree is dirty. */
  50 static const char *diff_index_args[] = {
  51         "diff-index", "--quiet", "HEAD", "--", NULL
  52 };
  53
  54 struct commit_name {
  55         struct hashmap_entry entry;
  56         struct object_id peeled;
  57         struct tag *tag;
  58         unsigned prio:2; /* annotated tag = 2, tag = 1, head = 0 */
  59         unsigned name_checked:1;
  60         unsigned misnamed:1;
  61         struct object_id oid;
  62         char *path;
  63 };
  64
  65 static const char *prio_names[] = {
  66         N_("head"), N_("lightweight"), N_("annotated"),
  67 };
  68
  69 static int commit_name_neq(const void *cmp_data UNUSED,
  70                            const struct hashmap_entry *eptr,
  71                            const struct hashmap_entry *entry_or_key,
  72                            const void *peeled)
  73 {
  74         const struct commit_name *cn1, *cn2;
  75
  76         cn1 = container_of(eptr, const struct commit_name, entry);
  77         cn2 = container_of(entry_or_key, const struct commit_name, entry);
  78
  79         return !oideq(&cn1->peeled, peeled ? peeled : &cn2->peeled);
  80 }
  81
  82 static inline struct commit_name *find_commit_name(const struct object_id *peeled)
  83 {
  84         return hashmap_get_entry_from_hash(&names, oidhash(peeled), peeled,
  85                                                 struct commit_name, entry);
  86 }
  87
  88 static int replace_name(struct commit_name *e,
  89                                int prio,
  90                                const struct object_id *oid,
  91                                struct tag **tag)
  92 {
  93         if (!e || e->prio < prio)
  94                 return 1;
  95
  96         if (e->prio == 2 && prio == 2) {
  97                 /* Multiple annotated tags point to the same commit.
  98                  * Select one to keep based upon their tagger date.
  99                  */
 100                 struct tag *t;
 101
 102                 if (!e->tag) {
 103                         t = lookup_tag(the_repository, &e->oid);
 104                         if (!t || parse_tag(t))
 105                                 return 1;
 106                         e->tag = t;
 107                 }
 108
 109                 t = lookup_tag(the_repository, oid);
 110                 if (!t || parse_tag(t))
 111                         return 0;
 112                 *tag = t;
 113
 114                 if (e->tag->date < t->date)
 115                         return 1;
 116         }
 117
 118         return 0;
 119 }
 120
 121 static void add_to_known_names(const char *path,
 122                                const struct object_id *peeled,
 123                                int prio,
 124                                const struct object_id *oid)
 125 {
 126         struct commit_name *e = find_commit_name(peeled);
 127         struct tag *tag = NULL;
 128         if (replace_name(e, prio, oid, &tag)) {
 129                 if (!e) {
 130                         e = xmalloc(sizeof(struct commit_name));
 131                         oidcpy(&e->peeled, peeled);
 132                         hashmap_entry_init(&e->entry, oidhash(peeled));
 133                         hashmap_add(&names, &e->entry);
 134                         e->path = NULL;
 135                 }
 136                 e->tag = tag;
 137                 e->prio = prio;
 138                 e->name_checked = 0;
 139                 e->misnamed = 0;
 140                 oidcpy(&e->oid, oid);
 141                 free(e->path);
 142                 e->path = xstrdup(path);
 143         }
 144 }
 145
 146 static int get_name(const char *path, const struct object_id *oid,
 147                     int flag UNUSED, void *cb_data UNUSED)
 148 {
 149         int is_tag = 0;
 150         struct object_id peeled;
 151         int is_annotated, prio;
 152         const char *path_to_match = NULL;
 153
 154         if (skip_prefix(path, "refs/tags/", &path_to_match)) {
 155                 is_tag = 1;
 156         } else if (all) {
 157                 if ((exclude_patterns.nr || patterns.nr) &&
 158                     !skip_prefix(path, "refs/heads/", &path_to_match) &&
 159                     !skip_prefix(path, "refs/remotes/", &path_to_match)) {
 160                         /* Only accept reference of known type if there are match/exclude patterns */
 161                         return 0;
 162                 }
 163         } else {
 164                 /* Reject anything outside refs/tags/ unless --all */
 165                 return 0;
 166         }
 167
 168         /*
 169          * If we're given exclude patterns, first exclude any tag which match
 170          * any of the exclude pattern.
 171          */
 172         if (exclude_patterns.nr) {
 173                 struct string_list_item *item;
 174
 175                 for_each_string_list_item(item, &exclude_patterns) {
 176                         if (!wildmatch(item->string, path_to_match, 0))
 177                                 return 0;
 178                 }
 179         }
 180
 181         /*
 182          * If we're given patterns, accept only tags which match at least one
 183          * pattern.
 184          */
 185         if (patterns.nr) {
 186                 int found = 0;
 187                 struct string_list_item *item;
 188
 189                 for_each_string_list_item(item, &patterns) {
 190                         if (!wildmatch(item->string, path_to_match, 0)) {
 191                                 found = 1;
 192                                 break;
 193                         }
 194                 }
 195
 196                 if (!found)
 197                         return 0;
 198         }
 199
 200         /* Is it annotated? */
 201         if (!peel_iterated_oid(oid, &peeled)) {
 202                 is_annotated = !oideq(oid, &peeled);
 203         } else {
 204                 oidcpy(&peeled, oid);
 205                 is_annotated = 0;
 206         }
 207
 208         /*
 209          * By default, we only use annotated tags, but with --tags
 210          * we fall back to lightweight ones (even without --tags,
 211          * we still remember lightweight ones, only to give hints
 212          * in an error message).  --all allows any refs to be used.
 213          */
 214         if (is_annotated)
 215                 prio = 2;
 216         else if (is_tag)
 217                 prio = 1;
 218         else
 219                 prio = 0;
 220
 221         add_to_known_names(all ? path + 5 : path + 10, &peeled, prio, oid);
 222         return 0;
 223 }
 224
 225 struct possible_tag {
 226         struct commit_name *name;
 227         int depth;
 228         int found_order;
 229         unsigned flag_within;
 230 };
 231
 232 static int compare_pt(const void *a_, const void *b_)
 233 {
 234         struct possible_tag *a = (struct possible_tag *)a_;
 235         struct possible_tag *b = (struct possible_tag *)b_;
 236         if (a->depth != b->depth)
 237                 return a->depth - b->depth;
 238         if (a->found_order != b->found_order)
 239                 return a->found_order - b->found_order;
 240         return 0;
 241 }
 242
 243 static unsigned long finish_depth_computation(
 244         struct commit_list **list,
 245         struct possible_tag *best)
 246 {
 247         unsigned long seen_commits = 0;
 248         while (*list) {
 249                 struct commit *c = pop_commit(list);
 250                 struct commit_list *parents = c->parents;
 251                 seen_commits++;
 252                 if (c->object.flags & best->flag_within) {
 253                         struct commit_list *a = *list;
 254                         while (a) {
 255                                 struct commit *i = a->item;
 256                                 if (!(i->object.flags & best->flag_within))
 257                                         break;
 258                                 a = a->next;
 259                         }
 260                         if (!a)
 261                                 break;
 262                 } else
 263                         best->depth++;
 264                 while (parents) {
 265                         struct commit *p = parents->item;
 266                         parse_commit(p);
 267                         if (!(p->object.flags & SEEN))
 268                                 commit_list_insert_by_date(p, list);
 269                         p->object.flags |= c->object.flags;
 270                         parents = parents->next;
 271                 }
 272         }
 273         return seen_commits;
 274 }
 275
 276 static void append_name(struct commit_name *n, struct strbuf *dst)
 277 {
 278         if (n->prio == 2 && !n->tag) {
 279                 n->tag = lookup_tag(the_repository, &n->oid);
 280                 if (!n->tag || parse_tag(n->tag))
 281                         die(_("annotated tag %s not available"), n->path);
 282         }
 283         if (n->tag && !n->name_checked) {
 284                 if (strcmp(n->tag->tag, all ? n->path + 5 : n->path)) {
 285                         warning(_("tag '%s' is externally known as '%s'"),
 286                                 n->path, n->tag->tag);
 287                         n->misnamed = 1;
 288                 }
 289                 n->name_checked = 1;
 290         }
 291
 292         if (n->tag) {
 293                 if (all)
 294                         strbuf_addstr(dst, "tags/");
 295                 strbuf_addstr(dst, n->tag->tag);
 296         } else {
 297                 strbuf_addstr(dst, n->path);
 298         }
 299 }
 300
 301 static void append_suffix(int depth, const struct object_id *oid, struct strbuf *dst)
 302 {
 303         strbuf_addf(dst, "-%d-g%s", depth, find_unique_abbrev(oid, abbrev));
 304 }
 305
 306 static void describe_commit(struct object_id *oid, struct strbuf *dst)
 307 {
 308         struct commit *cmit, *gave_up_on = NULL;
 309         struct commit_list *list;
 310         struct commit_name *n;
 311         struct possible_tag all_matches[MAX_TAGS];
 312         unsigned int match_cnt = 0, annotated_cnt = 0, cur_match;
 313         unsigned long seen_commits = 0;
 314         unsigned int unannotated_cnt = 0;
 315
 316         cmit = lookup_commit_reference(the_repository, oid);
 317
 318         n = find_commit_name(&cmit->object.oid);
 319         if (n && (tags || all || n->prio == 2)) {
 320                 /*
 321                  * Exact match to an existing ref.
 322                  */
 323                 append_name(n, dst);
 324                 if (n->misnamed || longformat)
 325                         append_suffix(0, n->tag ? get_tagged_oid(n->tag) : oid, dst);
 326                 if (suffix)
 327                         strbuf_addstr(dst, suffix);
 328                 return;
 329         }
 330
 331         if (!max_candidates)
 332                 die(_("no tag exactly matches '%s'"), oid_to_hex(&cmit->object.oid));
 333         if (debug)
 334                 fprintf(stderr, _("No exact match on refs or tags, searching to describe\n"));
 335
 336         if (!have_util) {
 337                 struct hashmap_iter iter;
 338                 struct commit *c;
 339                 struct commit_name *n;
 340
 341                 init_commit_names(&commit_names);
 342                 hashmap_for_each_entry(&names, &iter, n,
 343                                         entry /* member name */) {
 344                         c = lookup_commit_reference_gently(the_repository,
 345                                                            &n->peeled, 1);
 346                         if (c)
 347                                 *commit_names_at(&commit_names, c) = n;
 348                 }
 349                 have_util = 1;
 350         }
 351
 352         list = NULL;
 353         cmit->object.flags = SEEN;
 354         commit_list_insert(cmit, &list);
 355         while (list) {
 356                 struct commit *c = pop_commit(&list);
 357                 struct commit_list *parents = c->parents;
 358                 struct commit_name **slot;
 359
 360                 seen_commits++;
 361                 slot = commit_names_peek(&commit_names, c);
 362                 n = slot ? *slot : NULL;
 363                 if (n) {
 364                         if (!tags && !all && n->prio < 2) {
 365                                 unannotated_cnt++;
 366                         } else if (match_cnt < max_candidates) {
 367                                 struct possible_tag *t = &all_matches[match_cnt++];
 368                                 t->name = n;
 369                                 t->depth = seen_commits - 1;
 370                                 t->flag_within = 1u << match_cnt;
 371                                 t->found_order = match_cnt;
 372                                 c->object.flags |= t->flag_within;
 373                                 if (n->prio == 2)
 374                                         annotated_cnt++;
 375                         }
 376                         else {
 377                                 gave_up_on = c;
 378                                 break;
 379                         }
 380                 }
 381                 for (cur_match = 0; cur_match < match_cnt; cur_match++) {
 382                         struct possible_tag *t = &all_matches[cur_match];
 383                         if (!(c->object.flags & t->flag_within))
 384                                 t->depth++;
 385                 }
 386                 /* Stop if last remaining path already covered by best candidate(s) */
 387                 if (annotated_cnt && !list) {
 388                         int best_depth = INT_MAX;
 389                         unsigned best_within = 0;
 390                         for (cur_match = 0; cur_match < match_cnt; cur_match++) {
 391                                 struct possible_tag *t = &all_matches[cur_match];
 392                                 if (t->depth < best_depth) {
 393                                         best_depth = t->depth;
 394                                         best_within = t->flag_within;
 395                                 } else if (t->depth == best_depth) {
 396                                         best_within |= t->flag_within;
 397                                 }
 398                         }
 399                         if ((c->object.flags & best_within) == best_within) {
 400                                 if (debug)
 401                                         fprintf(stderr, _("finished search at %s\n"),
 402                                                 oid_to_hex(&c->object.oid));
 403                                 break;
 404                         }
 405                 }
 406                 while (parents) {
 407                         struct commit *p = parents->item;
 408                         parse_commit(p);
 409                         if (!(p->object.flags & SEEN))
 410                                 commit_list_insert_by_date(p, &list);
 411                         p->object.flags |= c->object.flags;
 412                         parents = parents->next;
 413
 414                         if (first_parent)
 415                                 break;
 416                 }
 417         }
 418
 419         if (!match_cnt) {
 420                 struct object_id *cmit_oid = &cmit->object.oid;
 421                 if (always) {
 422                         strbuf_add_unique_abbrev(dst, cmit_oid, abbrev);
 423                         if (suffix)
 424                                 strbuf_addstr(dst, suffix);
 425                         return;
 426                 }
 427                 if (unannotated_cnt)
 428                         die(_("No annotated tags can describe '%s'.\n"
 429                             "However, there were unannotated tags: try --tags."),
 430                             oid_to_hex(cmit_oid));
 431                 else
 432                         die(_("No tags can describe '%s'.\n"
 433                             "Try --always, or create some tags."),
 434                             oid_to_hex(cmit_oid));
 435         }
 436
 437         QSORT(all_matches, match_cnt, compare_pt);
 438
 439         if (gave_up_on) {
 440                 commit_list_insert_by_date(gave_up_on, &list);
 441                 seen_commits--;
 442         }
 443         seen_commits += finish_depth_computation(&list, &all_matches[0]);
 444         free_commit_list(list);
 445
 446         if (debug) {
 447                 static int label_width = -1;
 448                 if (label_width < 0) {
 449                         int i, w;
 450                         for (i = 0; i < ARRAY_SIZE(prio_names); i++) {
 451                                 w = strlen(_(prio_names[i]));
 452                                 if (label_width < w)
 453                                         label_width = w;
 454                         }
 455                 }
 456                 for (cur_match = 0; cur_match < match_cnt; cur_match++) {
 457                         struct possible_tag *t = &all_matches[cur_match];
 458                         fprintf(stderr, " %-*s %8d %s\n",
 459                                 label_width, _(prio_names[t->name->prio]),
 460                                 t->depth, t->name->path);
 461                 }
 462                 fprintf(stderr, _("traversed %lu commits\n"), seen_commits);
 463                 if (gave_up_on) {
 464                         fprintf(stderr,
 465                                 _("more than %i tags found; listed %i most recent\n"
 466                                 "gave up search at %s\n"),
 467                                 max_candidates, max_candidates,
 468                                 oid_to_hex(&gave_up_on->object.oid));
 469                 }
 470         }
 471
 472         append_name(all_matches[0].name, dst);
 473         if (all_matches[0].name->misnamed || abbrev)
 474                 append_suffix(all_matches[0].depth, &cmit->object.oid, dst);
 475         if (suffix)
 476                 strbuf_addstr(dst, suffix);
 477 }
 478
 479 struct process_commit_data {
 480         struct object_id current_commit;
 481         struct object_id looking_for;
 482         struct strbuf *dst;
 483         struct rev_info *revs;
 484 };
 485
 486 static void process_commit(struct commit *commit, void *data)
 487 {
 488         struct process_commit_data *pcd = data;
 489         pcd->current_commit = commit->object.oid;
 490 }
 491
 492 static void process_object(struct object *obj, const char *path, void *data)
 493 {
 494         struct process_commit_data *pcd = data;
 495
 496         if (oideq(&pcd->looking_for, &obj->oid) && !pcd->dst->len) {
 497                 reset_revision_walk();
 498                 describe_commit(&pcd->current_commit, pcd->dst);
 499                 strbuf_addf(pcd->dst, ":%s", path);
 500                 free_commit_list(pcd->revs->commits);
 501                 pcd->revs->commits = NULL;
 502         }
 503 }
 504
 505 static void describe_blob(struct object_id oid, struct strbuf *dst)
 506 {
 507         struct rev_info revs;
 508         struct strvec args = STRVEC_INIT;
 509         struct process_commit_data pcd = { *null_oid(), oid, dst, &revs};
 510
 511         strvec_pushl(&args, "internal: The first arg is not parsed",
 512                      "--objects", "--in-commit-order", "--reverse", "HEAD",
 513                      NULL);
 514
 515         repo_init_revisions(the_repository, &revs, NULL);
 516         if (setup_revisions(args.nr, args.v, &revs, NULL) > 1)
 517                 BUG("setup_revisions could not handle all args?");
 518
 519         if (prepare_revision_walk(&revs))
 520                 die("revision walk setup failed");
 521
 522         traverse_commit_list(&revs, process_commit, process_object, &pcd);
 523         reset_revision_walk();
 524         release_revisions(&revs);
 525 }
 526
 527 static void describe(const char *arg, int last_one)
 528 {
 529         struct object_id oid;
 530         struct commit *cmit;
 531         struct strbuf sb = STRBUF_INIT;
 532
 533         if (debug)
 534                 fprintf(stderr, _("describe %s\n"), arg);
 535
 536         if (get_oid(arg, &oid))
 537                 die(_("Not a valid object name %s"), arg);
 538         cmit = lookup_commit_reference_gently(the_repository, &oid, 1);
 539
 540         if (cmit)
 541                 describe_commit(&oid, &sb);
 542         else if (oid_object_info(the_repository, &oid, NULL) == OBJ_BLOB)
 543                 describe_blob(oid, &sb);
 544         else
 545                 die(_("%s is neither a commit nor blob"), arg);
 546
 547         puts(sb.buf);
 548
 549         if (!last_one)
 550                 clear_commit_marks(cmit, -1);
 551
 552         strbuf_release(&sb);
 553 }
 554
 555 int cmd_describe(int argc, const char **argv, const char *prefix)
 556 {
 557         int contains = 0;
 558         struct option options[] = {
 559                 OPT_BOOL(0, "contains",   &contains, N_("find the tag that comes after the commit")),
 560                 OPT_BOOL(0, "debug",      &debug, N_("debug search strategy on stderr")),
 561                 OPT_BOOL(0, "all",        &all, N_("use any ref")),
 562                 OPT_BOOL(0, "tags",       &tags, N_("use any tag, even unannotated")),
 563                 OPT_BOOL(0, "long",       &longformat, N_("always use long format")),
 564                 OPT_BOOL(0, "first-parent", &first_parent, N_("only follow first parent")),
 565                 OPT__ABBREV(&abbrev),
 566                 OPT_SET_INT(0, "exact-match", &max_candidates,
 567                             N_("only output exact matches"), 0),
 568                 OPT_INTEGER(0, "candidates", &max_candidates,
 569                             N_("consider <n> most recent tags (default: 10)")),
 570                 OPT_STRING_LIST(0, "match", &patterns, N_("pattern"),
 571                            N_("only consider tags matching <pattern>")),
 572                 OPT_STRING_LIST(0, "exclude", &exclude_patterns, N_("pattern"),
 573                            N_("do not consider tags matching <pattern>")),
 574                 OPT_BOOL(0, "always",        &always,
 575                         N_("show abbreviated commit object as fallback")),
 576                 {OPTION_STRING, 0, "dirty",  &dirty, N_("mark"),
 577                         N_("append <mark> on dirty working tree (default: \"-dirty\")"),
 578                         PARSE_OPT_OPTARG, NULL, (intptr_t) "-dirty"},
 579                 {OPTION_STRING, 0, "broken",  &broken, N_("mark"),
 580                         N_("append <mark> on broken working tree (default: \"-broken\")"),
 581                         PARSE_OPT_OPTARG, NULL, (intptr_t) "-broken"},
 582                 OPT_END(),
 583         };
 584
 585         git_config(git_default_config, NULL);
 586         argc = parse_options(argc, argv, prefix, options, describe_usage, 0);
 587         if (abbrev < 0)
 588                 abbrev = DEFAULT_ABBREV;
 589
 590         if (max_candidates < 0)
 591                 max_candidates = 0;
 592         else if (max_candidates > MAX_TAGS)
 593                 max_candidates = MAX_TAGS;
 594
 595         save_commit_buffer = 0;
 596
 597         if (longformat && abbrev == 0)
 598                 die(_("options '%s' and '%s' cannot be used together"), "--long", "--abbrev=0");
 599
 600         if (contains) {
 601                 struct string_list_item *item;
 602                 struct strvec args;
 603
 604                 strvec_init(&args);
 605                 strvec_pushl(&args, "name-rev",
 606                              "--peel-tag", "--name-only", "--no-undefined",
 607                              NULL);
 608                 if (always)
 609                         strvec_push(&args, "--always");
 610                 if (!all) {
 611                         strvec_push(&args, "--tags");
 612                         for_each_string_list_item(item, &patterns)
 613                                 strvec_pushf(&args, "--refs=refs/tags/%s", item->string);
 614                         for_each_string_list_item(item, &exclude_patterns)
 615                                 strvec_pushf(&args, "--exclude=refs/tags/%s", item->string);
 616                 }
 617                 if (argc)
 618                         strvec_pushv(&args, argv);
 619                 else
 620                         strvec_push(&args, "HEAD");
 621                 return cmd_name_rev(args.nr, args.v, prefix);
 622         }
 623
 624         hashmap_init(&names, commit_name_neq, NULL, 0);
 625         for_each_rawref(get_name, NULL);
 626         if (!hashmap_get_size(&names) && !always)
 627                 die(_("No names found, cannot describe anything."));
 628
 629         if (argc == 0) {
 630                 if (broken) {
 631                         struct child_process cp = CHILD_PROCESS_INIT;
 632                         strvec_pushv(&cp.args, diff_index_args);
 633                         cp.git_cmd = 1;
 634                         cp.no_stdin = 1;
 635                         cp.no_stdout = 1;
 636
 637                         if (!dirty)
 638                                 dirty = "-dirty";
 639
 640                         switch (run_command(&cp)) {
 641                         case 0:
 642                                 suffix = NULL;
 643                                 break;
 644                         case 1:
 645                                 suffix = dirty;
 646                                 break;
 647                         default:
 648                                 /* diff-index aborted abnormally */
 649                                 suffix = broken;
 650                         }
 651                 } else if (dirty) {
 652                         struct lock_file index_lock = LOCK_INIT;
 653                         struct rev_info revs;
 654                         struct strvec args = STRVEC_INIT;
 655                         int fd, result;
 656
 657                         setup_work_tree();
 658                         repo_read_index(the_repository);
 659                         refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED,
 660                                       NULL, NULL, NULL);
 661                         fd = repo_hold_locked_index(the_repository,
 662                                                     &index_lock, 0);
 663                         if (0 <= fd)
 664                                 repo_update_index_if_able(the_repository, &index_lock);
 665
 666                         repo_init_revisions(the_repository, &revs, prefix);
 667                         strvec_pushv(&args, diff_index_args);
 668                         if (setup_revisions(args.nr, args.v, &revs, NULL) != 1)
 669                                 BUG("malformed internal diff-index command line");
 670                         result = run_diff_index(&revs, 0);
 671
 672                         if (!diff_result_code(&revs.diffopt, result))
 673                                 suffix = NULL;
 674                         else
 675                                 suffix = dirty;
 676                         release_revisions(&revs);
 677                 }
 678                 describe("HEAD", 1);
 679         } else if (dirty) {
 680                 die(_("option '%s' and commit-ishes cannot be used together"), "--dirty");
 681         } else if (broken) {
 682                 die(_("option '%s' and commit-ishes cannot be used together"), "--broken");
 683         } else {
 684                 while (argc-- > 0)
 685                         describe(*argv++, argc == 0);
 686         }
 687         return 0;
 688 }