builtin/describe.c

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