builtin/describe.c

   1 #define USE_THE_INDEX_VARIABLE
   2 #include "builtin.h"
   3 #include "config.h"
   4 #include "environment.h"
   5 #include "gettext.h"
   6 #include "hex.h"
   7 #include "lockfile.h"
   8 #include "commit.h"
   9 #include "tag.h"
  10 #include "blob.h"
  11 #include "refs.h"
  12 #include "exec-cmd.h"
  13 #include "object-name.h"
  14 #include "parse-options.h"
  15 #include "read-cache-ll.h"
  16 #include "revision.h"
  17 #include "diff.h"
  18 #include "hashmap.h"
  19 #include "setup.h"
  20 #include "strvec.h"
  21 #include "run-command.h"
  22 #include "object-store-ll.h"
  23 #include "list-objects.h"
  24 #include "commit-slab.h"
  25 #include "wildmatch.h"
  26
  27 #define MAX_TAGS        (FLAG_BITS - 1)
  28
  29 define_commit_slab(commit_names, struct commit_name *);
  30
  31 static const char * const describe_usage[] = {
  32         N_("git describe [--all] [--tags] [--contains] [--abbrev=<n>] [<commit-ish>...]"),
  33         N_("git describe [--all] [--tags] [--contains] [--abbrev=<n>] --dirty[=<mark>]"),
  34         N_("git describe <blob>"),
  35         NULL
  36 };
  37
  38 static int debug;       /* Display lots of verbose info */
  39 static int all; /* Any valid ref can be used */
  40 static int tags;        /* Allow lightweight tags */
  41 static int longformat;
  42 static int first_parent;
  43 static int abbrev = -1; /* unspecified */
  44 static int max_candidates = 10;
  45 static struct hashmap names;
  46 static int have_util;
  47 static struct string_list patterns = STRING_LIST_INIT_NODUP;
  48 static struct string_list exclude_patterns = STRING_LIST_INIT_NODUP;
  49 static int always;
  50 static const char *suffix, *dirty, *broken;
  51 static struct commit_names commit_names;
  52
  53 /* diff-index command arguments to check if working tree is dirty. */
  54 static const char *diff_index_args[] = {
  55         "diff-index", "--quiet", "HEAD", "--", NULL
  56 };
  57
  58 struct commit_name {
  59         struct hashmap_entry entry;
  60         struct object_id peeled;
  61         struct tag *tag;
  62         unsigned prio:2; /* annotated tag = 2, tag = 1, head = 0 */
  63         unsigned name_checked:1;
  64         unsigned misnamed:1;
  65         struct object_id oid;
  66         char *path;
  67 };
  68
  69 static const char *prio_names[] = {
  70         N_("head"), N_("lightweight"), N_("annotated"),
  71 };
  72
  73 static int commit_name_neq(const void *cmp_data UNUSED,
  74                            const struct hashmap_entry *eptr,
  75                            const struct hashmap_entry *entry_or_key,
  76                            const void *peeled)
  77 {
  78         const struct commit_name *cn1, *cn2;
  79
  80         cn1 = container_of(eptr, const struct commit_name, entry);
  81         cn2 = container_of(entry_or_key, const struct commit_name, entry);
  82
  83         return !oideq(&cn1->peeled, peeled ? peeled : &cn2->peeled);
  84 }
  85
  86 static inline struct commit_name *find_commit_name(const struct object_id *peeled)
  87 {
  88         return hashmap_get_entry_from_hash(&names, oidhash(peeled), peeled,
  89                                                 struct commit_name, entry);
  90 }
  91
  92 static int replace_name(struct commit_name *e,
  93                                int prio,
  94                                const struct object_id *oid,
  95                                struct tag **tag)
  96 {
  97         if (!e || e->prio < prio)
  98                 return 1;
  99
 100         if (e->prio == 2 && prio == 2) {
 101                 /* Multiple annotated tags point to the same commit.
 102                  * Select one to keep based upon their tagger date.
 103                  */
 104                 struct tag *t;
 105
 106                 if (!e->tag) {
 107                         t = lookup_tag(the_repository, &e->oid);
 108                         if (!t || parse_tag(t))
 109                                 return 1;
 110                         e->tag = t;
 111                 }
 112
 113                 t = lookup_tag(the_repository, oid);
 114                 if (!t || parse_tag(t))
 115                         return 0;
 116                 *tag = t;
 117
 118                 if (e->tag->date < t->date)
 119                         return 1;
 120         }
 121
 122         return 0;
 123 }
 124
 125 static void add_to_known_names(const char *path,
 126                                const struct object_id *peeled,
 127                                int prio,
 128                                const struct object_id *oid)
 129 {
 130         struct commit_name *e = find_commit_name(peeled);
 131         struct tag *tag = NULL;
 132         if (replace_name(e, prio, oid, &tag)) {
 133                 if (!e) {
 134                         e = xmalloc(sizeof(struct commit_name));
 135                         oidcpy(&e->peeled, peeled);
 136                         hashmap_entry_init(&e->entry, oidhash(peeled));
 137                         hashmap_add(&names, &e->entry);
 138                         e->path = NULL;
 139                 }
 140                 e->tag = tag;
 141                 e->prio = prio;
 142                 e->name_checked = 0;
 143                 e->misnamed = 0;
 144                 oidcpy(&e->oid, oid);
 145                 free(e->path);
 146                 e->path = xstrdup(path);
 147         }
 148 }
 149
 150 static int get_name(const char *path, const struct object_id *oid,
 151                     int flag UNUSED, void *cb_data UNUSED)
 152 {
 153         int is_tag = 0;
 154         struct object_id peeled;
 155         int is_annotated, prio;
 156         const char *path_to_match = NULL;
 157
 158         if (skip_prefix(path, "refs/tags/", &path_to_match)) {
 159                 is_tag = 1;
 160         } else if (all) {
 161                 if ((exclude_patterns.nr || patterns.nr) &&
 162                     !skip_prefix(path, "refs/heads/", &path_to_match) &&
 163                     !skip_prefix(path, "refs/remotes/", &path_to_match)) {
 164                         /* Only accept reference of known type if there are match/exclude patterns */
 165                         return 0;
 166                 }
 167         } else {
 168                 /* Reject anything outside refs/tags/ unless --all */
 169                 return 0;
 170         }
 171
 172         /*
 173          * If we're given exclude patterns, first exclude any tag which match
 174          * any of the exclude pattern.
 175          */
 176         if (exclude_patterns.nr) {
 177                 struct string_list_item *item;
 178
 179                 for_each_string_list_item(item, &exclude_patterns) {
 180                         if (!wildmatch(item->string, path_to_match, 0))
 181                                 return 0;
 182                 }
 183         }
 184
 185         /*
 186          * If we're given patterns, accept only tags which match at least one
 187          * pattern.
 188          */
 189         if (patterns.nr) {
 190                 int found = 0;
 191                 struct string_list_item *item;
 192
 193                 for_each_string_list_item(item, &patterns) {
 194                         if (!wildmatch(item->string, path_to_match, 0)) {
 195                                 found = 1;
 196                                 break;
 197                         }
 198                 }
 199
 200                 if (!found)
 201                         return 0;
 202         }
 203
 204         /* Is it annotated? */
 205         if (!peel_iterated_oid(oid, &peeled)) {
 206                 is_annotated = !oideq(oid, &peeled);
 207         } else {
 208                 oidcpy(&peeled, oid);
 209                 is_annotated = 0;
 210         }
 211
 212         /*
 213          * By default, we only use annotated tags, but with --tags
 214          * we fall back to lightweight ones (even without --tags,
 215          * we still remember lightweight ones, only to give hints
 216          * in an error message).  --all allows any refs to be used.
 217          */
 218         if (is_annotated)
 219                 prio = 2;
 220         else if (is_tag)
 221                 prio = 1;
 222         else
 223                 prio = 0;
 224
 225         add_to_known_names(all ? path + 5 : path + 10, &peeled, prio, oid);
 226         return 0;
 227 }
 228
 229 struct possible_tag {
 230         struct commit_name *name;
 231         int depth;
 232         int found_order;
 233         unsigned flag_within;
 234 };
 235
 236 static int compare_pt(const void *a_, const void *b_)
 237 {
 238         struct possible_tag *a = (struct possible_tag *)a_;
 239         struct possible_tag *b = (struct possible_tag *)b_;
 240         if (a->depth != b->depth)
 241                 return a->depth - b->depth;
 242         if (a->found_order != b->found_order)
 243                 return a->found_order - b->found_order;
 244         return 0;
 245 }
 246
 247 static unsigned long finish_depth_computation(
 248         struct commit_list **list,
 249         struct possible_tag *best)
 250 {
 251         unsigned long seen_commits = 0;
 252         while (*list) {
 253                 struct commit *c = pop_commit(list);
 254                 struct commit_list *parents = c->parents;
 255                 seen_commits++;
 256                 if (c->object.flags & best->flag_within) {
 257                         struct commit_list *a = *list;
 258                         while (a) {
 259                                 struct commit *i = a->item;
 260                                 if (!(i->object.flags & best->flag_within))
 261                                         break;
 262                                 a = a->next;
 263                         }
 264                         if (!a)
 265                                 break;
 266                 } else
 267                         best->depth++;
 268                 while (parents) {
 269                         struct commit *p = parents->item;
 270                         repo_parse_commit(the_repository, p);
 271                         if (!(p->object.flags & SEEN))
 272                                 commit_list_insert_by_date(p, list);
 273                         p->object.flags |= c->object.flags;
 274                         parents = parents->next;
 275                 }
 276         }
 277         return seen_commits;
 278 }
 279
 280 static void append_name(struct commit_name *n, struct strbuf *dst)
 281 {
 282         if (n->prio == 2 && !n->tag) {
 283                 n->tag = lookup_tag(the_repository, &n->oid);
 284                 if (!n->tag || parse_tag(n->tag))
 285                         die(_("annotated tag %s not available"), n->path);
 286         }
 287         if (n->tag && !n->name_checked) {
 288                 if (strcmp(n->tag->tag, all ? n->path + 5 : n->path)) {
 289                         warning(_("tag '%s' is externally known as '%s'"),
 290                                 n->path, n->tag->tag);
 291                         n->misnamed = 1;
 292                 }
 293                 n->name_checked = 1;
 294         }
 295
 296         if (n->tag) {
 297                 if (all)
 298                         strbuf_addstr(dst, "tags/");
 299                 strbuf_addstr(dst, n->tag->tag);
 300         } else {
 301                 strbuf_addstr(dst, n->path);
 302         }
 303 }
 304
 305 static void append_suffix(int depth, const struct object_id *oid, struct strbuf *dst)
 306 {
 307         strbuf_addf(dst, "-%d-g%s", depth,
 308                     repo_find_unique_abbrev(the_repository, oid, abbrev));
 309 }
 310
 311 static void describe_commit(struct object_id *oid, struct strbuf *dst)
 312 {
 313         struct commit *cmit, *gave_up_on = NULL;
 314         struct commit_list *list;
 315         struct commit_name *n;
 316         struct possible_tag all_matches[MAX_TAGS];
 317         unsigned int match_cnt = 0, annotated_cnt = 0, cur_match;
 318         unsigned long seen_commits = 0;
 319         unsigned int unannotated_cnt = 0;
 320
 321         cmit = lookup_commit_reference(the_repository, oid);
 322
 323         n = find_commit_name(&cmit->object.oid);
 324         if (n && (tags || all || n->prio == 2)) {
 325                 /*
 326                  * Exact match to an existing ref.
 327                  */
 328                 append_name(n, dst);
 329                 if (n->misnamed || longformat)
 330                         append_suffix(0, n->tag ? get_tagged_oid(n->tag) : oid, dst);
 331                 if (suffix)
 332                         strbuf_addstr(dst, suffix);
 333                 return;
 334         }
 335
 336         if (!max_candidates)
 337                 die(_("no tag exactly matches '%s'"), oid_to_hex(&cmit->object.oid));
 338         if (debug)
 339                 fprintf(stderr, _("No exact match on refs or tags, searching to describe\n"));
 340
 341         if (!have_util) {
 342                 struct hashmap_iter iter;
 343                 struct commit *c;
 344                 struct commit_name *n;
 345
 346                 init_commit_names(&commit_names);
 347                 hashmap_for_each_entry(&names, &iter, n,
 348                                         entry /* member name */) {
 349                         c = lookup_commit_reference_gently(the_repository,
 350                                                            &n->peeled, 1);
 351                         if (c)
 352                                 *commit_names_at(&commit_names, c) = n;
 353                 }
 354                 have_util = 1;
 355         }
 356
 357         list = NULL;
 358         cmit->object.flags = SEEN;
 359         commit_list_insert(cmit, &list);
 360         while (list) {
 361                 struct commit *c = pop_commit(&list);
 362                 struct commit_list *parents = c->parents;
 363                 struct commit_name **slot;
 364
 365                 seen_commits++;
 366                 slot = commit_names_peek(&commit_names, c);
 367                 n = slot ? *slot : NULL;
 368                 if (n) {
 369                         if (!tags && !all && n->prio < 2) {
 370                                 unannotated_cnt++;
 371                         } else if (match_cnt < max_candidates) {
 372                                 struct possible_tag *t = &all_matches[match_cnt++];
 373                                 t->name = n;
 374                                 t->depth = seen_commits - 1;
 375                                 t->flag_within = 1u << match_cnt;
 376                                 t->found_order = match_cnt;
 377                                 c->object.flags |= t->flag_within;
 378                                 if (n->prio == 2)
 379                                         annotated_cnt++;
 380                         }
 381                         else {
 382                                 gave_up_on = c;
 383                                 break;
 384                         }
 385                 }
 386                 for (cur_match = 0; cur_match < match_cnt; cur_match++) {
 387                         struct possible_tag *t = &all_matches[cur_match];
 388                         if (!(c->object.flags & t->flag_within))
 389                                 t->depth++;
 390                 }
 391                 /* Stop if last remaining path already covered by best candidate(s) */
 392                 if (annotated_cnt && !list) {
 393                         int best_depth = INT_MAX;
 394                         unsigned best_within = 0;
 395                         for (cur_match = 0; cur_match < match_cnt; cur_match++) {
 396                                 struct possible_tag *t = &all_matches[cur_match];
 397                                 if (t->depth < best_depth) {
 398                                         best_depth = t->depth;
 399                                         best_within = t->flag_within;
 400                                 } else if (t->depth == best_depth) {
 401                                         best_within |= t->flag_within;
 402                                 }
 403                         }
 404                         if ((c->object.flags & best_within) == best_within) {
 405                                 if (debug)
 406                                         fprintf(stderr, _("finished search at %s\n"),
 407                                                 oid_to_hex(&c->object.oid));
 408                                 break;
 409                         }
 410                 }
 411                 while (parents) {
 412                         struct commit *p = parents->item;
 413                         repo_parse_commit(the_repository, p);
 414                         if (!(p->object.flags & SEEN))
 415                                 commit_list_insert_by_date(p, &list);
 416                         p->object.flags |= c->object.flags;
 417                         parents = parents->next;
 418
 419                         if (first_parent)
 420                                 break;
 421                 }
 422         }
 423
 424         if (!match_cnt) {
 425                 struct object_id *cmit_oid = &cmit->object.oid;
 426                 if (always) {
 427                         strbuf_add_unique_abbrev(dst, cmit_oid, abbrev);
 428                         if (suffix)
 429                                 strbuf_addstr(dst, suffix);
 430                         return;
 431                 }
 432                 if (unannotated_cnt)
 433                         die(_("No annotated tags can describe '%s'.\n"
 434                             "However, there were unannotated tags: try --tags."),
 435                             oid_to_hex(cmit_oid));
 436                 else
 437                         die(_("No tags can describe '%s'.\n"
 438                             "Try --always, or create some tags."),
 439                             oid_to_hex(cmit_oid));
 440         }
 441
 442         QSORT(all_matches, match_cnt, compare_pt);
 443
 444         if (gave_up_on) {
 445                 commit_list_insert_by_date(gave_up_on, &list);
 446                 seen_commits--;
 447         }
 448         seen_commits += finish_depth_computation(&list, &all_matches[0]);
 449         free_commit_list(list);
 450
 451         if (debug) {
 452                 static int label_width = -1;
 453                 if (label_width < 0) {
 454                         int i, w;
 455                         for (i = 0; i < ARRAY_SIZE(prio_names); i++) {
 456                                 w = strlen(_(prio_names[i]));
 457                                 if (label_width < w)
 458                                         label_width = w;
 459                         }
 460                 }
 461                 for (cur_match = 0; cur_match < match_cnt; cur_match++) {
 462                         struct possible_tag *t = &all_matches[cur_match];
 463                         fprintf(stderr, " %-*s %8d %s\n",
 464                                 label_width, _(prio_names[t->name->prio]),
 465                                 t->depth, t->name->path);
 466                 }
 467                 fprintf(stderr, _("traversed %lu commits\n"), seen_commits);
 468                 if (gave_up_on) {
 469                         fprintf(stderr,
 470                                 _("more than %i tags found; listed %i most recent\n"
 471                                 "gave up search at %s\n"),
 472                                 max_candidates, max_candidates,
 473                                 oid_to_hex(&gave_up_on->object.oid));
 474                 }
 475         }
 476
 477         append_name(all_matches[0].name, dst);
 478         if (all_matches[0].name->misnamed || abbrev)
 479                 append_suffix(all_matches[0].depth, &cmit->object.oid, dst);
 480         if (suffix)
 481                 strbuf_addstr(dst, suffix);
 482 }
 483
 484 struct process_commit_data {
 485         struct object_id current_commit;
 486         struct object_id looking_for;
 487         struct strbuf *dst;
 488         struct rev_info *revs;
 489 };
 490
 491 static void process_commit(struct commit *commit, void *data)
 492 {
 493         struct process_commit_data *pcd = data;
 494         pcd->current_commit = commit->object.oid;
 495 }
 496
 497 static void process_object(struct object *obj, const char *path, void *data)
 498 {
 499         struct process_commit_data *pcd = data;
 500
 501         if (oideq(&pcd->looking_for, &obj->oid) && !pcd->dst->len) {
 502                 reset_revision_walk();
 503                 describe_commit(&pcd->current_commit, pcd->dst);
 504                 strbuf_addf(pcd->dst, ":%s", path);
 505                 free_commit_list(pcd->revs->commits);
 506                 pcd->revs->commits = NULL;
 507         }
 508 }
 509
 510 static void describe_blob(struct object_id oid, struct strbuf *dst)
 511 {
 512         struct rev_info revs;
 513         struct strvec args = STRVEC_INIT;
 514         struct process_commit_data pcd = { *null_oid(), oid, dst, &revs};
 515
 516         strvec_pushl(&args, "internal: The first arg is not parsed",
 517                      "--objects", "--in-commit-order", "--reverse", "HEAD",
 518                      NULL);
 519
 520         repo_init_revisions(the_repository, &revs, NULL);
 521         if (setup_revisions(args.nr, args.v, &revs, NULL) > 1)
 522                 BUG("setup_revisions could not handle all args?");
 523
 524         if (prepare_revision_walk(&revs))
 525                 die("revision walk setup failed");
 526
 527         traverse_commit_list(&revs, process_commit, process_object, &pcd);
 528         reset_revision_walk();
 529         release_revisions(&revs);
 530 }
 531
 532 static void describe(const char *arg, int last_one)
 533 {
 534         struct object_id oid;
 535         struct commit *cmit;
 536         struct strbuf sb = STRBUF_INIT;
 537
 538         if (debug)
 539                 fprintf(stderr, _("describe %s\n"), arg);
 540
 541         if (repo_get_oid(the_repository, arg, &oid))
 542                 die(_("Not a valid object name %s"), arg);
 543         cmit = lookup_commit_reference_gently(the_repository, &oid, 1);
 544
 545         if (cmit)
 546                 describe_commit(&oid, &sb);
 547         else if (oid_object_info(the_repository, &oid, NULL) == OBJ_BLOB)
 548                 describe_blob(oid, &sb);
 549         else
 550                 die(_("%s is neither a commit nor blob"), arg);
 551
 552         puts(sb.buf);
 553
 554         if (!last_one)
 555                 clear_commit_marks(cmit, -1);
 556
 557         strbuf_release(&sb);
 558 }
 559
 560 int cmd_describe(int argc, const char **argv, const char *prefix)
 561 {
 562         int contains = 0;
 563         struct option options[] = {
 564                 OPT_BOOL(0, "contains",   &contains, N_("find the tag that comes after the commit")),
 565                 OPT_BOOL(0, "debug",      &debug, N_("debug search strategy on stderr")),
 566                 OPT_BOOL(0, "all",        &all, N_("use any ref")),
 567                 OPT_BOOL(0, "tags",       &tags, N_("use any tag, even unannotated")),
 568                 OPT_BOOL(0, "long",       &longformat, N_("always use long format")),
 569                 OPT_BOOL(0, "first-parent", &first_parent, N_("only follow first parent")),
 570                 OPT__ABBREV(&abbrev),
 571                 OPT_SET_INT(0, "exact-match", &max_candidates,
 572                             N_("only output exact matches"), 0),
 573                 OPT_INTEGER(0, "candidates", &max_candidates,
 574                             N_("consider <n> most recent tags (default: 10)")),
 575                 OPT_STRING_LIST(0, "match", &patterns, N_("pattern"),
 576                            N_("only consider tags matching <pattern>")),
 577                 OPT_STRING_LIST(0, "exclude", &exclude_patterns, N_("pattern"),
 578                            N_("do not consider tags matching <pattern>")),
 579                 OPT_BOOL(0, "always",        &always,
 580                         N_("show abbreviated commit object as fallback")),
 581                 {OPTION_STRING, 0, "dirty",  &dirty, N_("mark"),
 582                         N_("append <mark> on dirty working tree (default: \"-dirty\")"),
 583                         PARSE_OPT_OPTARG, NULL, (intptr_t) "-dirty"},
 584                 {OPTION_STRING, 0, "broken",  &broken, N_("mark"),
 585                         N_("append <mark> on broken working tree (default: \"-broken\")"),
 586                         PARSE_OPT_OPTARG, NULL, (intptr_t) "-broken"},
 587                 OPT_END(),
 588         };
 589
 590         git_config(git_default_config, NULL);
 591         argc = parse_options(argc, argv, prefix, options, describe_usage, 0);
 592         if (abbrev < 0)
 593                 abbrev = DEFAULT_ABBREV;
 594
 595         if (max_candidates < 0)
 596                 max_candidates = 0;
 597         else if (max_candidates > MAX_TAGS)
 598                 max_candidates = MAX_TAGS;
 599
 600         save_commit_buffer = 0;
 601
 602         if (longformat && abbrev == 0)
 603                 die(_("options '%s' and '%s' cannot be used together"), "--long", "--abbrev=0");
 604
 605         if (contains) {
 606                 struct string_list_item *item;
 607                 struct strvec args;
 608
 609                 strvec_init(&args);
 610                 strvec_pushl(&args, "name-rev",
 611                              "--peel-tag", "--name-only", "--no-undefined",
 612                              NULL);
 613                 if (always)
 614                         strvec_push(&args, "--always");
 615                 if (!all) {
 616                         strvec_push(&args, "--tags");
 617                         for_each_string_list_item(item, &patterns)
 618                                 strvec_pushf(&args, "--refs=refs/tags/%s", item->string);
 619                         for_each_string_list_item(item, &exclude_patterns)
 620                                 strvec_pushf(&args, "--exclude=refs/tags/%s", item->string);
 621                 }
 622                 if (argc)
 623                         strvec_pushv(&args, argv);
 624                 else
 625                         strvec_push(&args, "HEAD");
 626                 return cmd_name_rev(args.nr, args.v, prefix);
 627         }
 628
 629         hashmap_init(&names, commit_name_neq, NULL, 0);
 630         for_each_rawref(get_name, NULL);
 631         if (!hashmap_get_size(&names) && !always)
 632                 die(_("No names found, cannot describe anything."));
 633
 634         if (argc == 0) {
 635                 if (broken) {
 636                         struct child_process cp = CHILD_PROCESS_INIT;
 637                         strvec_pushv(&cp.args, diff_index_args);
 638                         cp.git_cmd = 1;
 639                         cp.no_stdin = 1;
 640                         cp.no_stdout = 1;
 641
 642                         if (!dirty)
 643                                 dirty = "-dirty";
 644
 645                         switch (run_command(&cp)) {
 646                         case 0:
 647                                 suffix = NULL;
 648                                 break;
 649                         case 1:
 650                                 suffix = dirty;
 651                                 break;
 652                         default:
 653                                 /* diff-index aborted abnormally */
 654                                 suffix = broken;
 655                         }
 656                 } else if (dirty) {
 657                         struct lock_file index_lock = LOCK_INIT;
 658                         struct rev_info revs;
 659                         struct strvec args = STRVEC_INIT;
 660                         int fd, result;
 661
 662                         setup_work_tree();
 663                         prepare_repo_settings(the_repository);
 664                         the_repository->settings.command_requires_full_index = 0;
 665                         repo_read_index(the_repository);
 666                         refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED,
 667                                       NULL, NULL, NULL);
 668                         fd = repo_hold_locked_index(the_repository,
 669                                                     &index_lock, 0);
 670                         if (0 <= fd)
 671                                 repo_update_index_if_able(the_repository, &index_lock);
 672
 673                         repo_init_revisions(the_repository, &revs, prefix);
 674                         strvec_pushv(&args, diff_index_args);
 675                         if (setup_revisions(args.nr, args.v, &revs, NULL) != 1)
 676                                 BUG("malformed internal diff-index command line");
 677                         result = run_diff_index(&revs, 0);
 678
 679                         if (!diff_result_code(&revs.diffopt, result))
 680                                 suffix = NULL;
 681                         else
 682                                 suffix = dirty;
 683                         release_revisions(&revs);
 684                 }
 685                 describe("HEAD", 1);
 686         } else if (dirty) {
 687                 die(_("option '%s' and commit-ishes cannot be used together"), "--dirty");
 688         } else if (broken) {
 689                 die(_("option '%s' and commit-ishes cannot be used together"), "--broken");
 690         } else {
 691                 while (argc-- > 0)
 692                         describe(*argv++, argc == 0);
 693         }
 694         return 0;
 695 }