builtin/describe.c

   1 #define USE_THE_REPOSITORY_VARIABLE
   2 #define DISABLE_SIGN_COMPARE_WARNINGS
   3
   4 #include "builtin.h"
   5 #include "config.h"
   6 #include "environment.h"
   7 #include "gettext.h"
   8 #include "hex.h"
   9 #include "lockfile.h"
  10 #include "commit.h"
  11 #include "tag.h"
  12 #include "refs.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.h"
  23 #include "list-objects.h"
  24 #include "commit-slab.h"
  25 #include "wildmatch.h"
  26
  27 #define MAX_TAGS        (FLAG_BITS - 1)
  28 #define DEFAULT_CANDIDATES 10
  29
  30 define_commit_slab(commit_names, struct commit_name *);
  31
  32 static const char * const describe_usage[] = {
  33         N_("git describe [--all] [--tags] [--contains] [--abbrev=<n>] [<commit-ish>...]"),
  34         N_("git describe [--all] [--tags] [--contains] [--abbrev=<n>] --dirty[=<mark>]"),
  35         N_("git describe <blob>"),
  36         NULL
  37 };
  38
  39 static int debug;       /* Display lots of verbose info */
  40 static int all; /* Any valid ref can be used */
  41 static int tags;        /* Allow lightweight tags */
  42 static int longformat;
  43 static int first_parent;
  44 static int abbrev = -1; /* unspecified */
  45 static int max_candidates = DEFAULT_CANDIDATES;
  46 static struct hashmap names;
  47 static int have_util;
  48 static struct string_list patterns = STRING_LIST_INIT_NODUP;
  49 static struct string_list exclude_patterns = STRING_LIST_INIT_NODUP;
  50 static int always;
  51 static const char *suffix, *dirty, *broken;
  52 static struct commit_names commit_names;
  53
  54 /* diff-index command arguments to check if working tree is dirty. */
  55 static const char *diff_index_args[] = {
  56         "diff-index", "--quiet", "HEAD", "--", NULL
  57 };
  58
  59 static const char *update_index_args[] = {
  60         "update-index", "--unmerged", "-q", "--refresh", NULL
  61 };
  62
  63 struct commit_name {
  64         struct hashmap_entry entry;
  65         struct object_id peeled;
  66         struct tag *tag;
  67         unsigned prio:2; /* annotated tag = 2, tag = 1, head = 0 */
  68         unsigned name_checked:1;
  69         unsigned misnamed:1;
  70         struct object_id oid;
  71         char *path;
  72 };
  73
  74 static const char *prio_names[] = {
  75         N_("head"), N_("lightweight"), N_("annotated"),
  76 };
  77
  78 static int commit_name_neq(const void *cmp_data UNUSED,
  79                            const struct hashmap_entry *eptr,
  80                            const struct hashmap_entry *entry_or_key,
  81                            const void *peeled)
  82 {
  83         const struct commit_name *cn1, *cn2;
  84
  85         cn1 = container_of(eptr, const struct commit_name, entry);
  86         cn2 = container_of(entry_or_key, const struct commit_name, entry);
  87
  88         return !oideq(&cn1->peeled, peeled ? peeled : &cn2->peeled);
  89 }
  90
  91 static inline struct commit_name *find_commit_name(const struct object_id *peeled)
  92 {
  93         return hashmap_get_entry_from_hash(&names, oidhash(peeled), peeled,
  94                                                 struct commit_name, entry);
  95 }
  96
  97 static int replace_name(struct commit_name *e,
  98                                int prio,
  99                                const struct object_id *oid,
 100                                struct tag **tag)
 101 {
 102         if (!e || e->prio < prio)
 103                 return 1;
 104
 105         if (e->prio == 2 && prio == 2) {
 106                 /* Multiple annotated tags point to the same commit.
 107                  * Select one to keep based upon their tagger date.
 108                  */
 109                 struct tag *t;
 110
 111                 if (!e->tag) {
 112                         t = lookup_tag(the_repository, &e->oid);
 113                         if (!t || parse_tag(t))
 114                                 return 1;
 115                         e->tag = t;
 116                 }
 117
 118                 t = lookup_tag(the_repository, oid);
 119                 if (!t || parse_tag(t))
 120                         return 0;
 121                 *tag = t;
 122
 123                 if (e->tag->date < t->date)
 124                         return 1;
 125         }
 126
 127         return 0;
 128 }
 129
 130 static void add_to_known_names(const char *path,
 131                                const struct object_id *peeled,
 132                                int prio,
 133                                const struct object_id *oid)
 134 {
 135         struct commit_name *e = find_commit_name(peeled);
 136         struct tag *tag = NULL;
 137         if (replace_name(e, prio, oid, &tag)) {
 138                 if (!e) {
 139                         e = xmalloc(sizeof(struct commit_name));
 140                         oidcpy(&e->peeled, peeled);
 141                         hashmap_entry_init(&e->entry, oidhash(peeled));
 142                         hashmap_add(&names, &e->entry);
 143                         e->path = NULL;
 144                 }
 145                 e->tag = tag;
 146                 e->prio = prio;
 147                 e->name_checked = 0;
 148                 e->misnamed = 0;
 149                 oidcpy(&e->oid, oid);
 150                 free(e->path);
 151                 e->path = xstrdup(path);
 152         }
 153 }
 154
 155 static int get_name(const char *path, const char *referent UNUSED, const struct object_id *oid,
 156                     int flag UNUSED, void *cb_data UNUSED)
 157 {
 158         int is_tag = 0;
 159         struct object_id peeled;
 160         int is_annotated, prio;
 161         const char *path_to_match = NULL;
 162
 163         if (skip_prefix(path, "refs/tags/", &path_to_match)) {
 164                 is_tag = 1;
 165         } else if (all) {
 166                 if ((exclude_patterns.nr || patterns.nr) &&
 167                     !skip_prefix(path, "refs/heads/", &path_to_match) &&
 168                     !skip_prefix(path, "refs/remotes/", &path_to_match)) {
 169                         /* Only accept reference of known type if there are match/exclude patterns */
 170                         return 0;
 171                 }
 172         } else {
 173                 /* Reject anything outside refs/tags/ unless --all */
 174                 return 0;
 175         }
 176
 177         /*
 178          * If we're given exclude patterns, first exclude any tag which match
 179          * any of the exclude pattern.
 180          */
 181         if (exclude_patterns.nr) {
 182                 struct string_list_item *item;
 183
 184                 for_each_string_list_item(item, &exclude_patterns) {
 185                         if (!wildmatch(item->string, path_to_match, 0))
 186                                 return 0;
 187                 }
 188         }
 189
 190         /*
 191          * If we're given patterns, accept only tags which match at least one
 192          * pattern.
 193          */
 194         if (patterns.nr) {
 195                 int found = 0;
 196                 struct string_list_item *item;
 197
 198                 for_each_string_list_item(item, &patterns) {
 199                         if (!wildmatch(item->string, path_to_match, 0)) {
 200                                 found = 1;
 201                                 break;
 202                         }
 203                 }
 204
 205                 if (!found)
 206                         return 0;
 207         }
 208
 209         /* Is it annotated? */
 210         if (!peel_iterated_oid(the_repository, oid, &peeled)) {
 211                 is_annotated = !oideq(oid, &peeled);
 212         } else {
 213                 oidcpy(&peeled, oid);
 214                 is_annotated = 0;
 215         }
 216
 217         /*
 218          * By default, we only use annotated tags, but with --tags
 219          * we fall back to lightweight ones (even without --tags,
 220          * we still remember lightweight ones, only to give hints
 221          * in an error message).  --all allows any refs to be used.
 222          */
 223         if (is_annotated)
 224                 prio = 2;
 225         else if (is_tag)
 226                 prio = 1;
 227         else
 228                 prio = 0;
 229
 230         add_to_known_names(all ? path + 5 : path + 10, &peeled, prio, oid);
 231         return 0;
 232 }
 233
 234 struct possible_tag {
 235         struct commit_name *name;
 236         int depth;
 237         int found_order;
 238         unsigned flag_within;
 239 };
 240
 241 static int compare_pt(const void *a_, const void *b_)
 242 {
 243         struct possible_tag *a = (struct possible_tag *)a_;
 244         struct possible_tag *b = (struct possible_tag *)b_;
 245         if (a->depth != b->depth)
 246                 return a->depth - b->depth;
 247         if (a->found_order != b->found_order)
 248                 return a->found_order - b->found_order;
 249         return 0;
 250 }
 251
 252 static unsigned long finish_depth_computation(
 253         struct commit_list **list,
 254         struct possible_tag *best)
 255 {
 256         unsigned long seen_commits = 0;
 257         while (*list) {
 258                 struct commit *c = pop_commit(list);
 259                 struct commit_list *parents = c->parents;
 260                 seen_commits++;
 261                 if (c->object.flags & best->flag_within) {
 262                         struct commit_list *a = *list;
 263                         while (a) {
 264                                 struct commit *i = a->item;
 265                                 if (!(i->object.flags & best->flag_within))
 266                                         break;
 267                                 a = a->next;
 268                         }
 269                         if (!a)
 270                                 break;
 271                 } else
 272                         best->depth++;
 273                 while (parents) {
 274                         struct commit *p = parents->item;
 275                         repo_parse_commit(the_repository, p);
 276                         if (!(p->object.flags & SEEN))
 277                                 commit_list_insert_by_date(p, list);
 278                         p->object.flags |= c->object.flags;
 279                         parents = parents->next;
 280                 }
 281         }
 282         return seen_commits;
 283 }
 284
 285 static void append_name(struct commit_name *n, struct strbuf *dst)
 286 {
 287         if (n->prio == 2 && !n->tag) {
 288                 n->tag = lookup_tag(the_repository, &n->oid);
 289                 if (!n->tag || parse_tag(n->tag))
 290                         die(_("annotated tag %s not available"), n->path);
 291         }
 292         if (n->tag && !n->name_checked) {
 293                 if (strcmp(n->tag->tag, all ? n->path + 5 : n->path)) {
 294                         warning(_("tag '%s' is externally known as '%s'"),
 295                                 n->path, n->tag->tag);
 296                         n->misnamed = 1;
 297                 }
 298                 n->name_checked = 1;
 299         }
 300
 301         if (n->tag) {
 302                 if (all)
 303                         strbuf_addstr(dst, "tags/");
 304                 strbuf_addstr(dst, n->tag->tag);
 305         } else {
 306                 strbuf_addstr(dst, n->path);
 307         }
 308 }
 309
 310 static void append_suffix(int depth, const struct object_id *oid, struct strbuf *dst)
 311 {
 312         strbuf_addf(dst, "-%d-g%s", depth,
 313                     repo_find_unique_abbrev(the_repository, oid, abbrev));
 314 }
 315
 316 static void describe_commit(struct object_id *oid, struct strbuf *dst)
 317 {
 318         struct commit *cmit, *gave_up_on = NULL;
 319         struct commit_list *list;
 320         struct commit_name *n;
 321         struct possible_tag all_matches[MAX_TAGS];
 322         unsigned int match_cnt = 0, annotated_cnt = 0, cur_match;
 323         unsigned long seen_commits = 0;
 324         unsigned int unannotated_cnt = 0;
 325
 326         cmit = lookup_commit_reference(the_repository, oid);
 327
 328         n = find_commit_name(&cmit->object.oid);
 329         if (n && (tags || all || n->prio == 2)) {
 330                 /*
 331                  * Exact match to an existing ref.
 332                  */
 333                 append_name(n, dst);
 334                 if (n->misnamed || longformat)
 335                         append_suffix(0, n->tag ? get_tagged_oid(n->tag) : oid, dst);
 336                 if (suffix)
 337                         strbuf_addstr(dst, suffix);
 338                 return;
 339         }
 340
 341         if (!max_candidates)
 342                 die(_("no tag exactly matches '%s'"), oid_to_hex(&cmit->object.oid));
 343         if (debug)
 344                 fprintf(stderr, _("No exact match on refs or tags, searching to describe\n"));
 345
 346         if (!have_util) {
 347                 struct hashmap_iter iter;
 348                 struct commit *c;
 349                 struct commit_name *n;
 350
 351                 init_commit_names(&commit_names);
 352                 hashmap_for_each_entry(&names, &iter, n,
 353                                         entry /* member name */) {
 354                         c = lookup_commit_reference_gently(the_repository,
 355                                                            &n->peeled, 1);
 356                         if (c)
 357                                 *commit_names_at(&commit_names, c) = n;
 358                 }
 359                 have_util = 1;
 360         }
 361
 362         list = NULL;
 363         cmit->object.flags = SEEN;
 364         commit_list_insert(cmit, &list);
 365         while (list) {
 366                 struct commit *c = pop_commit(&list);
 367                 struct commit_list *parents = c->parents;
 368                 struct commit_name **slot;
 369
 370                 seen_commits++;
 371
 372                 if (match_cnt == max_candidates ||
 373                     match_cnt == hashmap_get_size(&names)) {
 374                         gave_up_on = c;
 375                         break;
 376                 }
 377
 378                 slot = commit_names_peek(&commit_names, c);
 379                 n = slot ? *slot : NULL;
 380                 if (n) {
 381                         if (!tags && !all && n->prio < 2) {
 382                                 unannotated_cnt++;
 383                         } else if (match_cnt < max_candidates) {
 384                                 struct possible_tag *t = &all_matches[match_cnt++];
 385                                 t->name = n;
 386                                 t->depth = seen_commits - 1;
 387                                 t->flag_within = 1u << match_cnt;
 388                                 t->found_order = match_cnt;
 389                                 c->object.flags |= t->flag_within;
 390                                 if (n->prio == 2)
 391                                         annotated_cnt++;
 392                         }
 393                 }
 394                 for (cur_match = 0; cur_match < match_cnt; cur_match++) {
 395                         struct possible_tag *t = &all_matches[cur_match];
 396                         if (!(c->object.flags & t->flag_within))
 397                                 t->depth++;
 398                 }
 399                 /* Stop if last remaining path already covered by best candidate(s) */
 400                 if (annotated_cnt && !list) {
 401                         int best_depth = INT_MAX;
 402                         unsigned best_within = 0;
 403                         for (cur_match = 0; cur_match < match_cnt; cur_match++) {
 404                                 struct possible_tag *t = &all_matches[cur_match];
 405                                 if (t->depth < best_depth) {
 406                                         best_depth = t->depth;
 407                                         best_within = t->flag_within;
 408                                 } else if (t->depth == best_depth) {
 409                                         best_within |= t->flag_within;
 410                                 }
 411                         }
 412                         if ((c->object.flags & best_within) == best_within) {
 413                                 if (debug)
 414                                         fprintf(stderr, _("finished search at %s\n"),
 415                                                 oid_to_hex(&c->object.oid));
 416                                 break;
 417                         }
 418                 }
 419                 while (parents) {
 420                         struct commit *p = parents->item;
 421                         repo_parse_commit(the_repository, p);
 422                         if (!(p->object.flags & SEEN))
 423                                 commit_list_insert_by_date(p, &list);
 424                         p->object.flags |= c->object.flags;
 425                         parents = parents->next;
 426
 427                         if (first_parent)
 428                                 break;
 429                 }
 430         }
 431
 432         if (!match_cnt) {
 433                 struct object_id *cmit_oid = &cmit->object.oid;
 434                 if (always) {
 435                         strbuf_add_unique_abbrev(dst, cmit_oid, abbrev);
 436                         if (suffix)
 437                                 strbuf_addstr(dst, suffix);
 438                         return;
 439                 }
 440                 if (unannotated_cnt)
 441                         die(_("No annotated tags can describe '%s'.\n"
 442                             "However, there were unannotated tags: try --tags."),
 443                             oid_to_hex(cmit_oid));
 444                 else
 445                         die(_("No tags can describe '%s'.\n"
 446                             "Try --always, or create some tags."),
 447                             oid_to_hex(cmit_oid));
 448         }
 449
 450         QSORT(all_matches, match_cnt, compare_pt);
 451
 452         if (gave_up_on) {
 453                 commit_list_insert_by_date(gave_up_on, &list);
 454                 seen_commits--;
 455         }
 456         seen_commits += finish_depth_computation(&list, &all_matches[0]);
 457         free_commit_list(list);
 458
 459         if (debug) {
 460                 static int label_width = -1;
 461                 if (label_width < 0) {
 462                         int i, w;
 463                         for (i = 0; i < ARRAY_SIZE(prio_names); i++) {
 464                                 w = strlen(_(prio_names[i]));
 465                                 if (label_width < w)
 466                                         label_width = w;
 467                         }
 468                 }
 469                 for (cur_match = 0; cur_match < match_cnt; cur_match++) {
 470                         struct possible_tag *t = &all_matches[cur_match];
 471                         fprintf(stderr, " %-*s %8d %s\n",
 472                                 label_width, _(prio_names[t->name->prio]),
 473                                 t->depth, t->name->path);
 474                 }
 475                 fprintf(stderr, _("traversed %lu commits\n"), seen_commits);
 476                 if (gave_up_on) {
 477                         fprintf(stderr,
 478                                 _("found %i tags; gave up search at %s\n"),
 479                                 max_candidates,
 480                                 oid_to_hex(&gave_up_on->object.oid));
 481                 }
 482         }
 483
 484         append_name(all_matches[0].name, dst);
 485         if (all_matches[0].name->misnamed || abbrev)
 486                 append_suffix(all_matches[0].depth, &cmit->object.oid, dst);
 487         if (suffix)
 488                 strbuf_addstr(dst, suffix);
 489 }
 490
 491 struct process_commit_data {
 492         struct object_id current_commit;
 493         struct object_id looking_for;
 494         struct strbuf *dst;
 495         struct rev_info *revs;
 496 };
 497
 498 static void process_commit(struct commit *commit, void *data)
 499 {
 500         struct process_commit_data *pcd = data;
 501         pcd->current_commit = commit->object.oid;
 502 }
 503
 504 static void process_object(struct object *obj, const char *path, void *data)
 505 {
 506         struct process_commit_data *pcd = data;
 507
 508         if (oideq(&pcd->looking_for, &obj->oid) && !pcd->dst->len) {
 509                 reset_revision_walk();
 510                 describe_commit(&pcd->current_commit, pcd->dst);
 511                 strbuf_addf(pcd->dst, ":%s", path);
 512                 free_commit_list(pcd->revs->commits);
 513                 pcd->revs->commits = NULL;
 514         }
 515 }
 516
 517 static void describe_blob(struct object_id oid, struct strbuf *dst)
 518 {
 519         struct rev_info revs;
 520         struct strvec args = STRVEC_INIT;
 521         struct process_commit_data pcd = { *null_oid(the_hash_algo), oid, dst, &revs};
 522
 523         strvec_pushl(&args, "internal: The first arg is not parsed",
 524                      "--objects", "--in-commit-order", "--reverse", "HEAD",
 525                      NULL);
 526
 527         repo_init_revisions(the_repository, &revs, NULL);
 528         if (setup_revisions(args.nr, args.v, &revs, NULL) > 1)
 529                 BUG("setup_revisions could not handle all args?");
 530
 531         if (prepare_revision_walk(&revs))
 532                 die("revision walk setup failed");
 533
 534         traverse_commit_list(&revs, process_commit, process_object, &pcd);
 535         reset_revision_walk();
 536         release_revisions(&revs);
 537         strvec_clear(&args);
 538 }
 539
 540 static void describe(const char *arg, int last_one)
 541 {
 542         struct object_id oid;
 543         struct commit *cmit;
 544         struct strbuf sb = STRBUF_INIT;
 545
 546         if (debug)
 547                 fprintf(stderr, _("describe %s\n"), arg);
 548
 549         if (repo_get_oid(the_repository, arg, &oid))
 550                 die(_("Not a valid object name %s"), arg);
 551         cmit = lookup_commit_reference_gently(the_repository, &oid, 1);
 552
 553         if (cmit)
 554                 describe_commit(&oid, &sb);
 555         else if (oid_object_info(the_repository, &oid, NULL) == OBJ_BLOB)
 556                 describe_blob(oid, &sb);
 557         else
 558                 die(_("%s is neither a commit nor blob"), arg);
 559
 560         puts(sb.buf);
 561
 562         if (!last_one)
 563                 clear_commit_marks(cmit, -1);
 564
 565         strbuf_release(&sb);
 566 }
 567
 568 static int option_parse_exact_match(const struct option *opt, const char *arg,
 569                                     int unset)
 570 {
 571         int *val = opt->value;
 572
 573         BUG_ON_OPT_ARG(arg);
 574
 575         *val = unset ? DEFAULT_CANDIDATES : 0;
 576         return 0;
 577 }
 578
 579 int cmd_describe(int argc,
 580                  const char **argv,
 581                  const char *prefix,
 582                  struct repository *repo UNUSED )
 583 {
 584         int contains = 0;
 585         struct option options[] = {
 586                 OPT_BOOL(0, "contains",   &contains, N_("find the tag that comes after the commit")),
 587                 OPT_BOOL(0, "debug",      &debug, N_("debug search strategy on stderr")),
 588                 OPT_BOOL(0, "all",        &all, N_("use any ref")),
 589                 OPT_BOOL(0, "tags",       &tags, N_("use any tag, even unannotated")),
 590                 OPT_BOOL(0, "long",       &longformat, N_("always use long format")),
 591                 OPT_BOOL(0, "first-parent", &first_parent, N_("only follow first parent")),
 592                 OPT__ABBREV(&abbrev),
 593                 OPT_CALLBACK_F(0, "exact-match", &max_candidates, NULL,
 594                                N_("only output exact matches"),
 595                                PARSE_OPT_NOARG, option_parse_exact_match),
 596                 OPT_INTEGER(0, "candidates", &max_candidates,
 597                             N_("consider <n> most recent tags (default: 10)")),
 598                 OPT_STRING_LIST(0, "match", &patterns, N_("pattern"),
 599                            N_("only consider tags matching <pattern>")),
 600                 OPT_STRING_LIST(0, "exclude", &exclude_patterns, N_("pattern"),
 601                            N_("do not consider tags matching <pattern>")),
 602                 OPT_BOOL(0, "always",        &always,
 603                         N_("show abbreviated commit object as fallback")),
 604                 {
 605                         .type = OPTION_STRING,
 606                         .long_name = "dirty",
 607                         .value = &dirty,
 608                         .argh = N_("mark"),
 609                         .help = N_("append <mark> on dirty working tree (default: \"-dirty\")"),
 610                         .flags = PARSE_OPT_OPTARG,
 611                         .defval = (intptr_t) "-dirty",
 612                 },
 613                 {
 614                         .type = OPTION_STRING,
 615                         .long_name = "broken",
 616                         .value = &broken,
 617                         .argh = N_("mark"),
 618                         .help = N_("append <mark> on broken working tree (default: \"-broken\")"),
 619                         .flags = PARSE_OPT_OPTARG,
 620                         .defval = (intptr_t) "-broken",
 621                 },
 622                 OPT_END(),
 623         };
 624
 625         git_config(git_default_config, NULL);
 626         argc = parse_options(argc, argv, prefix, options, describe_usage, 0);
 627         if (abbrev < 0)
 628                 abbrev = DEFAULT_ABBREV;
 629
 630         if (max_candidates < 0)
 631                 max_candidates = 0;
 632         else if (max_candidates > MAX_TAGS)
 633                 max_candidates = MAX_TAGS;
 634
 635         save_commit_buffer = 0;
 636
 637         if (longformat && abbrev == 0)
 638                 die(_("options '%s' and '%s' cannot be used together"), "--long", "--abbrev=0");
 639
 640         if (contains) {
 641                 struct string_list_item *item;
 642                 struct strvec args;
 643                 const char **argv_copy;
 644                 int ret;
 645
 646                 strvec_init(&args);
 647                 strvec_pushl(&args, "name-rev",
 648                              "--peel-tag", "--name-only", "--no-undefined",
 649                              NULL);
 650                 if (always)
 651                         strvec_push(&args, "--always");
 652                 if (!all) {
 653                         strvec_push(&args, "--tags");
 654                         for_each_string_list_item(item, &patterns)
 655                                 strvec_pushf(&args, "--refs=refs/tags/%s", item->string);
 656                         for_each_string_list_item(item, &exclude_patterns)
 657                                 strvec_pushf(&args, "--exclude=refs/tags/%s", item->string);
 658                 }
 659                 if (argc)
 660                         strvec_pushv(&args, argv);
 661                 else
 662                         strvec_push(&args, "HEAD");
 663
 664                 /*
 665                  * `cmd_name_rev()` modifies the array, so we'd leak its
 666                  * contained strings if we didn't do a copy here.
 667                  */
 668                 ALLOC_ARRAY(argv_copy, args.nr + 1);
 669                 for (size_t i = 0; i < args.nr; i++)
 670                         argv_copy[i] = args.v[i];
 671                 argv_copy[args.nr] = NULL;
 672
 673                 ret = cmd_name_rev(args.nr, argv_copy, prefix, the_repository);
 674
 675                 strvec_clear(&args);
 676                 free(argv_copy);
 677                 return ret;
 678         }
 679
 680         hashmap_init(&names, commit_name_neq, NULL, 0);
 681         refs_for_each_rawref(get_main_ref_store(the_repository), get_name,
 682                              NULL);
 683         if (!hashmap_get_size(&names) && !always)
 684                 die(_("No names found, cannot describe anything."));
 685
 686         if (argc == 0) {
 687                 if (broken) {
 688                         struct child_process cp = CHILD_PROCESS_INIT;
 689
 690                         strvec_pushv(&cp.args, update_index_args);
 691                         cp.git_cmd = 1;
 692                         cp.no_stdin = 1;
 693                         cp.no_stdout = 1;
 694                         run_command(&cp);
 695
 696                         child_process_init(&cp);
 697                         strvec_pushv(&cp.args, diff_index_args);
 698                         cp.git_cmd = 1;
 699                         cp.no_stdin = 1;
 700                         cp.no_stdout = 1;
 701
 702                         if (!dirty)
 703                                 dirty = "-dirty";
 704
 705                         switch (run_command(&cp)) {
 706                         case 0:
 707                                 suffix = NULL;
 708                                 break;
 709                         case 1:
 710                                 suffix = dirty;
 711                                 break;
 712                         default:
 713                                 /* diff-index aborted abnormally */
 714                                 suffix = broken;
 715                         }
 716                 } else if (dirty) {
 717                         struct lock_file index_lock = LOCK_INIT;
 718                         struct rev_info revs;
 719                         int fd;
 720
 721                         setup_work_tree();
 722                         prepare_repo_settings(the_repository);
 723                         the_repository->settings.command_requires_full_index = 0;
 724                         repo_read_index(the_repository);
 725                         refresh_index(the_repository->index, REFRESH_QUIET|REFRESH_UNMERGED,
 726                                       NULL, NULL, NULL);
 727                         fd = repo_hold_locked_index(the_repository,
 728                                                     &index_lock, 0);
 729                         if (0 <= fd)
 730                                 repo_update_index_if_able(the_repository, &index_lock);
 731
 732                         repo_init_revisions(the_repository, &revs, prefix);
 733
 734                         if (setup_revisions(ARRAY_SIZE(diff_index_args) - 1,
 735                                             diff_index_args, &revs, NULL) != 1)
 736                                 BUG("malformed internal diff-index command line");
 737                         run_diff_index(&revs, 0);
 738
 739                         if (!diff_result_code(&revs))
 740                                 suffix = NULL;
 741                         else
 742                                 suffix = dirty;
 743                         release_revisions(&revs);
 744                 }
 745                 describe("HEAD", 1);
 746         } else if (dirty) {
 747                 die(_("option '%s' and commit-ishes cannot be used together"), "--dirty");
 748         } else if (broken) {
 749                 die(_("option '%s' and commit-ishes cannot be used together"), "--broken");
 750         } else {
 751                 while (argc-- > 0)
 752                         describe(*argv++, argc == 0);
 753         }
 754         return 0;
 755 }