builtin/bisect.c

   1 #include "builtin.h"
   2 #include "copy.h"
   3 #include "environment.h"
   4 #include "gettext.h"
   5 #include "hex.h"
   6 #include "object-name.h"
   7 #include "parse-options.h"
   8 #include "bisect.h"
   9 #include "refs.h"
  10 #include "strvec.h"
  11 #include "run-command.h"
  12 #include "oid-array.h"
  13 #include "path.h"
  14 #include "prompt.h"
  15 #include "quote.h"
  16 #include "revision.h"
  17
  18 static GIT_PATH_FUNC(git_path_bisect_terms, "BISECT_TERMS")
  19 static GIT_PATH_FUNC(git_path_bisect_ancestors_ok, "BISECT_ANCESTORS_OK")
  20 static GIT_PATH_FUNC(git_path_bisect_start, "BISECT_START")
  21 static GIT_PATH_FUNC(git_path_bisect_log, "BISECT_LOG")
  22 static GIT_PATH_FUNC(git_path_bisect_names, "BISECT_NAMES")
  23 static GIT_PATH_FUNC(git_path_bisect_first_parent, "BISECT_FIRST_PARENT")
  24 static GIT_PATH_FUNC(git_path_bisect_run, "BISECT_RUN")
  25
  26 #define BUILTIN_GIT_BISECT_START_USAGE \
  27         N_("git bisect start [--term-(new|bad)=<term> --term-(old|good)=<term>]" \
  28            "    [--no-checkout] [--first-parent] [<bad> [<good>...]] [--]" \
  29            "    [<pathspec>...]")
  30 #define BUILTIN_GIT_BISECT_STATE_USAGE \
  31         N_("git bisect (good|bad) [<rev>...]")
  32 #define BUILTIN_GIT_BISECT_TERMS_USAGE \
  33         "git bisect terms [--term-good | --term-bad]"
  34 #define BUILTIN_GIT_BISECT_SKIP_USAGE \
  35         N_("git bisect skip [(<rev>|<range>)...]")
  36 #define BUILTIN_GIT_BISECT_NEXT_USAGE \
  37         "git bisect next"
  38 #define BUILTIN_GIT_BISECT_RESET_USAGE \
  39         N_("git bisect reset [<commit>]")
  40 #define BUILTIN_GIT_BISECT_VISUALIZE_USAGE \
  41         "git bisect visualize"
  42 #define BUILTIN_GIT_BISECT_REPLAY_USAGE \
  43         N_("git bisect replay <logfile>")
  44 #define BUILTIN_GIT_BISECT_LOG_USAGE \
  45         "git bisect log"
  46 #define BUILTIN_GIT_BISECT_RUN_USAGE \
  47         N_("git bisect run <cmd> [<arg>...]")
  48
  49 static const char * const git_bisect_usage[] = {
  50         BUILTIN_GIT_BISECT_START_USAGE,
  51         BUILTIN_GIT_BISECT_STATE_USAGE,
  52         BUILTIN_GIT_BISECT_TERMS_USAGE,
  53         BUILTIN_GIT_BISECT_SKIP_USAGE,
  54         BUILTIN_GIT_BISECT_NEXT_USAGE,
  55         BUILTIN_GIT_BISECT_RESET_USAGE,
  56         BUILTIN_GIT_BISECT_VISUALIZE_USAGE,
  57         BUILTIN_GIT_BISECT_REPLAY_USAGE,
  58         BUILTIN_GIT_BISECT_LOG_USAGE,
  59         BUILTIN_GIT_BISECT_RUN_USAGE,
  60         NULL
  61 };
  62
  63 struct add_bisect_ref_data {
  64         struct rev_info *revs;
  65         unsigned int object_flags;
  66 };
  67
  68 struct bisect_terms {
  69         char *term_good;
  70         char *term_bad;
  71 };
  72
  73 static void free_terms(struct bisect_terms *terms)
  74 {
  75         FREE_AND_NULL(terms->term_good);
  76         FREE_AND_NULL(terms->term_bad);
  77 }
  78
  79 static void set_terms(struct bisect_terms *terms, const char *bad,
  80                       const char *good)
  81 {
  82         free((void *)terms->term_good);
  83         terms->term_good = xstrdup(good);
  84         free((void *)terms->term_bad);
  85         terms->term_bad = xstrdup(bad);
  86 }
  87
  88 static const char vocab_bad[] = "bad|new";
  89 static const char vocab_good[] = "good|old";
  90
  91 static int bisect_autostart(struct bisect_terms *terms);
  92
  93 /*
  94  * Check whether the string `term` belongs to the set of strings
  95  * included in the variable arguments.
  96  */
  97 LAST_ARG_MUST_BE_NULL
  98 static int one_of(const char *term, ...)
  99 {
 100         int res = 0;
 101         va_list matches;
 102         const char *match;
 103
 104         va_start(matches, term);
 105         while (!res && (match = va_arg(matches, const char *)))
 106                 res = !strcmp(term, match);
 107         va_end(matches);
 108
 109         return res;
 110 }
 111
 112 /*
 113  * return code BISECT_INTERNAL_SUCCESS_MERGE_BASE
 114  * and BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND are codes
 115  * that indicate special success.
 116  */
 117
 118 static int is_bisect_success(enum bisect_error res)
 119 {
 120         return !res ||
 121                 res == BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND ||
 122                 res == BISECT_INTERNAL_SUCCESS_MERGE_BASE;
 123 }
 124
 125 static int write_in_file(const char *path, const char *mode, const char *format, va_list args)
 126 {
 127         FILE *fp = NULL;
 128         int res = 0;
 129
 130         if (strcmp(mode, "w") && strcmp(mode, "a"))
 131                 BUG("write-in-file does not support '%s' mode", mode);
 132         fp = fopen(path, mode);
 133         if (!fp)
 134                 return error_errno(_("cannot open file '%s' in mode '%s'"), path, mode);
 135         res = vfprintf(fp, format, args);
 136
 137         if (res < 0) {
 138                 int saved_errno = errno;
 139                 fclose(fp);
 140                 errno = saved_errno;
 141                 return error_errno(_("could not write to file '%s'"), path);
 142         }
 143
 144         return fclose(fp);
 145 }
 146
 147 __attribute__((format (printf, 2, 3)))
 148 static int write_to_file(const char *path, const char *format, ...)
 149 {
 150         int res;
 151         va_list args;
 152
 153         va_start(args, format);
 154         res = write_in_file(path, "w", format, args);
 155         va_end(args);
 156
 157         return res;
 158 }
 159
 160 __attribute__((format (printf, 2, 3)))
 161 static int append_to_file(const char *path, const char *format, ...)
 162 {
 163         int res;
 164         va_list args;
 165
 166         va_start(args, format);
 167         res = write_in_file(path, "a", format, args);
 168         va_end(args);
 169
 170         return res;
 171 }
 172
 173 static int print_file_to_stdout(const char *path)
 174 {
 175         int fd = open(path, O_RDONLY);
 176         int ret = 0;
 177
 178         if (fd < 0)
 179                 return error_errno(_("cannot open file '%s' for reading"), path);
 180         if (copy_fd(fd, 1) < 0)
 181                 ret = error_errno(_("failed to read '%s'"), path);
 182         close(fd);
 183         return ret;
 184 }
 185
 186 static int check_term_format(const char *term, const char *orig_term)
 187 {
 188         int res;
 189         char *new_term = xstrfmt("refs/bisect/%s", term);
 190
 191         res = check_refname_format(new_term, 0);
 192         free(new_term);
 193
 194         if (res)
 195                 return error(_("'%s' is not a valid term"), term);
 196
 197         if (one_of(term, "help", "start", "skip", "next", "reset",
 198                         "visualize", "view", "replay", "log", "run", "terms", NULL))
 199                 return error(_("can't use the builtin command '%s' as a term"), term);
 200
 201         /*
 202          * In theory, nothing prevents swapping completely good and bad,
 203          * but this situation could be confusing and hasn't been tested
 204          * enough. Forbid it for now.
 205          */
 206
 207         if ((strcmp(orig_term, "bad") && one_of(term, "bad", "new", NULL)) ||
 208                  (strcmp(orig_term, "good") && one_of(term, "good", "old", NULL)))
 209                 return error(_("can't change the meaning of the term '%s'"), term);
 210
 211         return 0;
 212 }
 213
 214 static int write_terms(const char *bad, const char *good)
 215 {
 216         int res;
 217
 218         if (!strcmp(bad, good))
 219                 return error(_("please use two different terms"));
 220
 221         if (check_term_format(bad, "bad") || check_term_format(good, "good"))
 222                 return -1;
 223
 224         res = write_to_file(git_path_bisect_terms(), "%s\n%s\n", bad, good);
 225
 226         return res;
 227 }
 228
 229 static int bisect_reset(const char *commit)
 230 {
 231         struct strbuf branch = STRBUF_INIT;
 232
 233         if (!commit) {
 234                 if (!strbuf_read_file(&branch, git_path_bisect_start(), 0))
 235                         printf(_("We are not bisecting.\n"));
 236                 else
 237                         strbuf_rtrim(&branch);
 238         } else {
 239                 struct object_id oid;
 240
 241                 if (repo_get_oid_commit(the_repository, commit, &oid))
 242                         return error(_("'%s' is not a valid commit"), commit);
 243                 strbuf_addstr(&branch, commit);
 244         }
 245
 246         if (branch.len && !ref_exists("BISECT_HEAD")) {
 247                 struct child_process cmd = CHILD_PROCESS_INIT;
 248
 249                 cmd.git_cmd = 1;
 250                 strvec_pushl(&cmd.args, "checkout", "--ignore-other-worktrees",
 251                                 branch.buf, "--", NULL);
 252                 if (run_command(&cmd)) {
 253                         error(_("could not check out original"
 254                                 " HEAD '%s'. Try 'git bisect"
 255                                 " reset <commit>'."), branch.buf);
 256                         strbuf_release(&branch);
 257                         return -1;
 258                 }
 259         }
 260
 261         strbuf_release(&branch);
 262         return bisect_clean_state();
 263 }
 264
 265 static void log_commit(FILE *fp, char *fmt, const char *state,
 266                        struct commit *commit)
 267 {
 268         struct pretty_print_context pp = {0};
 269         struct strbuf commit_msg = STRBUF_INIT;
 270         char *label = xstrfmt(fmt, state);
 271
 272         repo_format_commit_message(the_repository, commit, "%s", &commit_msg,
 273                                    &pp);
 274
 275         fprintf(fp, "# %s: [%s] %s\n", label, oid_to_hex(&commit->object.oid),
 276                 commit_msg.buf);
 277
 278         strbuf_release(&commit_msg);
 279         free(label);
 280 }
 281
 282 static int bisect_write(const char *state, const char *rev,
 283                         const struct bisect_terms *terms, int nolog)
 284 {
 285         struct strbuf tag = STRBUF_INIT;
 286         struct object_id oid;
 287         struct commit *commit;
 288         FILE *fp = NULL;
 289         int res = 0;
 290
 291         if (!strcmp(state, terms->term_bad)) {
 292                 strbuf_addf(&tag, "refs/bisect/%s", state);
 293         } else if (one_of(state, terms->term_good, "skip", NULL)) {
 294                 strbuf_addf(&tag, "refs/bisect/%s-%s", state, rev);
 295         } else {
 296                 res = error(_("Bad bisect_write argument: %s"), state);
 297                 goto finish;
 298         }
 299
 300         if (repo_get_oid(the_repository, rev, &oid)) {
 301                 res = error(_("couldn't get the oid of the rev '%s'"), rev);
 302                 goto finish;
 303         }
 304
 305         if (update_ref(NULL, tag.buf, &oid, NULL, 0,
 306                        UPDATE_REFS_MSG_ON_ERR)) {
 307                 res = -1;
 308                 goto finish;
 309         }
 310
 311         fp = fopen(git_path_bisect_log(), "a");
 312         if (!fp) {
 313                 res = error_errno(_("couldn't open the file '%s'"), git_path_bisect_log());
 314                 goto finish;
 315         }
 316
 317         commit = lookup_commit_reference(the_repository, &oid);
 318         log_commit(fp, "%s", state, commit);
 319
 320         if (!nolog)
 321                 fprintf(fp, "git bisect %s %s\n", state, rev);
 322
 323 finish:
 324         if (fp)
 325                 fclose(fp);
 326         strbuf_release(&tag);
 327         return res;
 328 }
 329
 330 static int check_and_set_terms(struct bisect_terms *terms, const char *cmd)
 331 {
 332         int has_term_file = !is_empty_or_missing_file(git_path_bisect_terms());
 333
 334         if (one_of(cmd, "skip", "start", "terms", NULL))
 335                 return 0;
 336
 337         if (has_term_file && strcmp(cmd, terms->term_bad) &&
 338             strcmp(cmd, terms->term_good))
 339                 return error(_("Invalid command: you're currently in a "
 340                                 "%s/%s bisect"), terms->term_bad,
 341                                 terms->term_good);
 342
 343         if (!has_term_file) {
 344                 if (one_of(cmd, "bad", "good", NULL)) {
 345                         set_terms(terms, "bad", "good");
 346                         return write_terms(terms->term_bad, terms->term_good);
 347                 }
 348                 if (one_of(cmd, "new", "old", NULL)) {
 349                         set_terms(terms, "new", "old");
 350                         return write_terms(terms->term_bad, terms->term_good);
 351                 }
 352         }
 353
 354         return 0;
 355 }
 356
 357 static int inc_nr(const char *refname UNUSED,
 358                   const struct object_id *oid UNUSED,
 359                   int flag UNUSED, void *cb_data)
 360 {
 361         unsigned int *nr = (unsigned int *)cb_data;
 362         (*nr)++;
 363         return 0;
 364 }
 365
 366 static const char need_bad_and_good_revision_warning[] =
 367         N_("You need to give me at least one %s and %s revision.\n"
 368            "You can use \"git bisect %s\" and \"git bisect %s\" for that.");
 369
 370 static const char need_bisect_start_warning[] =
 371         N_("You need to start by \"git bisect start\".\n"
 372            "You then need to give me at least one %s and %s revision.\n"
 373            "You can use \"git bisect %s\" and \"git bisect %s\" for that.");
 374
 375 static int decide_next(const struct bisect_terms *terms,
 376                        const char *current_term, int missing_good,
 377                        int missing_bad)
 378 {
 379         if (!missing_good && !missing_bad)
 380                 return 0;
 381         if (!current_term)
 382                 return -1;
 383
 384         if (missing_good && !missing_bad &&
 385             !strcmp(current_term, terms->term_good)) {
 386                 char *yesno;
 387                 /*
 388                  * have bad (or new) but not good (or old). We could bisect
 389                  * although this is less optimum.
 390                  */
 391                 warning(_("bisecting only with a %s commit"), terms->term_bad);
 392                 if (!isatty(0))
 393                         return 0;
 394                 /*
 395                  * TRANSLATORS: Make sure to include [Y] and [n] in your
 396                  * translation. The program will only accept English input
 397                  * at this point.
 398                  */
 399                 yesno = git_prompt(_("Are you sure [Y/n]? "), PROMPT_ECHO);
 400                 if (starts_with(yesno, "N") || starts_with(yesno, "n"))
 401                         return -1;
 402                 return 0;
 403         }
 404
 405         if (!is_empty_or_missing_file(git_path_bisect_start()))
 406                 return error(_(need_bad_and_good_revision_warning),
 407                              vocab_bad, vocab_good, vocab_bad, vocab_good);
 408         else
 409                 return error(_(need_bisect_start_warning),
 410                              vocab_good, vocab_bad, vocab_good, vocab_bad);
 411 }
 412
 413 static void bisect_status(struct bisect_state *state,
 414                           const struct bisect_terms *terms)
 415 {
 416         char *bad_ref = xstrfmt("refs/bisect/%s", terms->term_bad);
 417         char *good_glob = xstrfmt("%s-*", terms->term_good);
 418
 419         if (ref_exists(bad_ref))
 420                 state->nr_bad = 1;
 421
 422         for_each_glob_ref_in(inc_nr, good_glob, "refs/bisect/",
 423                              (void *) &state->nr_good);
 424
 425         free(good_glob);
 426         free(bad_ref);
 427 }
 428
 429 __attribute__((format (printf, 1, 2)))
 430 static void bisect_log_printf(const char *fmt, ...)
 431 {
 432         struct strbuf buf = STRBUF_INIT;
 433         va_list ap;
 434
 435         va_start(ap, fmt);
 436         strbuf_vaddf(&buf, fmt, ap);
 437         va_end(ap);
 438
 439         printf("%s", buf.buf);
 440         append_to_file(git_path_bisect_log(), "# %s", buf.buf);
 441
 442         strbuf_release(&buf);
 443 }
 444
 445 static void bisect_print_status(const struct bisect_terms *terms)
 446 {
 447         struct bisect_state state = { 0 };
 448
 449         bisect_status(&state, terms);
 450
 451         /* If we had both, we'd already be started, and shouldn't get here. */
 452         if (state.nr_good && state.nr_bad)
 453                 return;
 454
 455         if (!state.nr_good && !state.nr_bad)
 456                 bisect_log_printf(_("status: waiting for both good and bad commits\n"));
 457         else if (state.nr_good)
 458                 bisect_log_printf(Q_("status: waiting for bad commit, %d good commit known\n",
 459                                      "status: waiting for bad commit, %d good commits known\n",
 460                                      state.nr_good), state.nr_good);
 461         else
 462                 bisect_log_printf(_("status: waiting for good commit(s), bad commit known\n"));
 463 }
 464
 465 static int bisect_next_check(const struct bisect_terms *terms,
 466                              const char *current_term)
 467 {
 468         struct bisect_state state = { 0 };
 469         bisect_status(&state, terms);
 470         return decide_next(terms, current_term, !state.nr_good, !state.nr_bad);
 471 }
 472
 473 static int get_terms(struct bisect_terms *terms)
 474 {
 475         struct strbuf str = STRBUF_INIT;
 476         FILE *fp = NULL;
 477         int res = 0;
 478
 479         fp = fopen(git_path_bisect_terms(), "r");
 480         if (!fp) {
 481                 res = -1;
 482                 goto finish;
 483         }
 484
 485         free_terms(terms);
 486         strbuf_getline_lf(&str, fp);
 487         terms->term_bad = strbuf_detach(&str, NULL);
 488         strbuf_getline_lf(&str, fp);
 489         terms->term_good = strbuf_detach(&str, NULL);
 490
 491 finish:
 492         if (fp)
 493                 fclose(fp);
 494         strbuf_release(&str);
 495         return res;
 496 }
 497
 498 static int bisect_terms(struct bisect_terms *terms, const char *option)
 499 {
 500         if (get_terms(terms))
 501                 return error(_("no terms defined"));
 502
 503         if (!option) {
 504                 printf(_("Your current terms are %s for the old state\n"
 505                          "and %s for the new state.\n"),
 506                        terms->term_good, terms->term_bad);
 507                 return 0;
 508         }
 509         if (one_of(option, "--term-good", "--term-old", NULL))
 510                 printf("%s\n", terms->term_good);
 511         else if (one_of(option, "--term-bad", "--term-new", NULL))
 512                 printf("%s\n", terms->term_bad);
 513         else
 514                 return error(_("invalid argument %s for 'git bisect terms'.\n"
 515                                "Supported options are: "
 516                                "--term-good|--term-old and "
 517                                "--term-bad|--term-new."), option);
 518
 519         return 0;
 520 }
 521
 522 static int bisect_append_log_quoted(const char **argv)
 523 {
 524         int res = 0;
 525         FILE *fp = fopen(git_path_bisect_log(), "a");
 526         struct strbuf orig_args = STRBUF_INIT;
 527
 528         if (!fp)
 529                 return -1;
 530
 531         if (fprintf(fp, "git bisect start") < 1) {
 532                 res = -1;
 533                 goto finish;
 534         }
 535
 536         sq_quote_argv(&orig_args, argv);
 537         if (fprintf(fp, "%s\n", orig_args.buf) < 1)
 538                 res = -1;
 539
 540 finish:
 541         fclose(fp);
 542         strbuf_release(&orig_args);
 543         return res;
 544 }
 545
 546 static int add_bisect_ref(const char *refname, const struct object_id *oid,
 547                           int flags UNUSED, void *cb)
 548 {
 549         struct add_bisect_ref_data *data = cb;
 550
 551         add_pending_oid(data->revs, refname, oid, data->object_flags);
 552
 553         return 0;
 554 }
 555
 556 static int prepare_revs(struct bisect_terms *terms, struct rev_info *revs)
 557 {
 558         int res = 0;
 559         struct add_bisect_ref_data cb = { revs };
 560         char *good = xstrfmt("%s-*", terms->term_good);
 561
 562         /*
 563          * We cannot use terms->term_bad directly in
 564          * for_each_glob_ref_in() and we have to append a '*' to it,
 565          * otherwise for_each_glob_ref_in() will append '/' and '*'.
 566          */
 567         char *bad = xstrfmt("%s*", terms->term_bad);
 568
 569         /*
 570          * It is important to reset the flags used by revision walks
 571          * as the previous call to bisect_next_all() in turn
 572          * sets up a revision walk.
 573          */
 574         reset_revision_walk();
 575         repo_init_revisions(the_repository, revs, NULL);
 576         setup_revisions(0, NULL, revs, NULL);
 577         for_each_glob_ref_in(add_bisect_ref, bad, "refs/bisect/", &cb);
 578         cb.object_flags = UNINTERESTING;
 579         for_each_glob_ref_in(add_bisect_ref, good, "refs/bisect/", &cb);
 580         if (prepare_revision_walk(revs))
 581                 res = error(_("revision walk setup failed\n"));
 582
 583         free(good);
 584         free(bad);
 585         return res;
 586 }
 587
 588 static int bisect_skipped_commits(struct bisect_terms *terms)
 589 {
 590         int res;
 591         FILE *fp = NULL;
 592         struct rev_info revs;
 593         struct commit *commit;
 594         struct pretty_print_context pp = {0};
 595         struct strbuf commit_name = STRBUF_INIT;
 596
 597         res = prepare_revs(terms, &revs);
 598         if (res)
 599                 return res;
 600
 601         fp = fopen(git_path_bisect_log(), "a");
 602         if (!fp)
 603                 return error_errno(_("could not open '%s' for appending"),
 604                                   git_path_bisect_log());
 605
 606         if (fprintf(fp, "# only skipped commits left to test\n") < 0)
 607                 return error_errno(_("failed to write to '%s'"), git_path_bisect_log());
 608
 609         while ((commit = get_revision(&revs)) != NULL) {
 610                 strbuf_reset(&commit_name);
 611                 repo_format_commit_message(the_repository, commit, "%s",
 612                                            &commit_name, &pp);
 613                 fprintf(fp, "# possible first %s commit: [%s] %s\n",
 614                         terms->term_bad, oid_to_hex(&commit->object.oid),
 615                         commit_name.buf);
 616         }
 617
 618         /*
 619          * Reset the flags used by revision walks in case
 620          * there is another revision walk after this one.
 621          */
 622         reset_revision_walk();
 623
 624         strbuf_release(&commit_name);
 625         release_revisions(&revs);
 626         fclose(fp);
 627         return 0;
 628 }
 629
 630 static int bisect_successful(struct bisect_terms *terms)
 631 {
 632         struct object_id oid;
 633         struct commit *commit;
 634         struct pretty_print_context pp = {0};
 635         struct strbuf commit_name = STRBUF_INIT;
 636         char *bad_ref = xstrfmt("refs/bisect/%s",terms->term_bad);
 637         int res;
 638
 639         read_ref(bad_ref, &oid);
 640         commit = lookup_commit_reference_by_name(bad_ref);
 641         repo_format_commit_message(the_repository, commit, "%s", &commit_name,
 642                                    &pp);
 643
 644         res = append_to_file(git_path_bisect_log(), "# first %s commit: [%s] %s\n",
 645                             terms->term_bad, oid_to_hex(&commit->object.oid),
 646                             commit_name.buf);
 647
 648         strbuf_release(&commit_name);
 649         free(bad_ref);
 650         return res;
 651 }
 652
 653 static enum bisect_error bisect_next(struct bisect_terms *terms, const char *prefix)
 654 {
 655         enum bisect_error res;
 656
 657         if (bisect_autostart(terms))
 658                 return BISECT_FAILED;
 659
 660         if (bisect_next_check(terms, terms->term_good))
 661                 return BISECT_FAILED;
 662
 663         /* Perform all bisection computation */
 664         res = bisect_next_all(the_repository, prefix);
 665
 666         if (res == BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND) {
 667                 res = bisect_successful(terms);
 668                 return res ? res : BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND;
 669         } else if (res == BISECT_ONLY_SKIPPED_LEFT) {
 670                 res = bisect_skipped_commits(terms);
 671                 return res ? res : BISECT_ONLY_SKIPPED_LEFT;
 672         }
 673         return res;
 674 }
 675
 676 static enum bisect_error bisect_auto_next(struct bisect_terms *terms, const char *prefix)
 677 {
 678         if (bisect_next_check(terms, NULL)) {
 679                 bisect_print_status(terms);
 680                 return BISECT_OK;
 681         }
 682
 683         return bisect_next(terms, prefix);
 684 }
 685
 686 static enum bisect_error bisect_start(struct bisect_terms *terms, int argc,
 687                                       const char **argv)
 688 {
 689         int no_checkout = 0;
 690         int first_parent_only = 0;
 691         int i, has_double_dash = 0, must_write_terms = 0, bad_seen = 0;
 692         int flags, pathspec_pos;
 693         enum bisect_error res = BISECT_OK;
 694         struct string_list revs = STRING_LIST_INIT_DUP;
 695         struct string_list states = STRING_LIST_INIT_DUP;
 696         struct strbuf start_head = STRBUF_INIT;
 697         struct strbuf bisect_names = STRBUF_INIT;
 698         struct object_id head_oid;
 699         struct object_id oid;
 700         const char *head;
 701
 702         if (is_bare_repository())
 703                 no_checkout = 1;
 704
 705         /*
 706          * Check for one bad and then some good revisions
 707          */
 708         for (i = 0; i < argc; i++) {
 709                 if (!strcmp(argv[i], "--")) {
 710                         has_double_dash = 1;
 711                         break;
 712                 }
 713         }
 714
 715         for (i = 0; i < argc; i++) {
 716                 const char *arg = argv[i];
 717                 if (!strcmp(argv[i], "--")) {
 718                         break;
 719                 } else if (!strcmp(arg, "--no-checkout")) {
 720                         no_checkout = 1;
 721                 } else if (!strcmp(arg, "--first-parent")) {
 722                         first_parent_only = 1;
 723                 } else if (!strcmp(arg, "--term-good") ||
 724                          !strcmp(arg, "--term-old")) {
 725                         i++;
 726                         if (argc <= i)
 727                                 return error(_("'' is not a valid term"));
 728                         must_write_terms = 1;
 729                         free((void *) terms->term_good);
 730                         terms->term_good = xstrdup(argv[i]);
 731                 } else if (skip_prefix(arg, "--term-good=", &arg) ||
 732                            skip_prefix(arg, "--term-old=", &arg)) {
 733                         must_write_terms = 1;
 734                         free((void *) terms->term_good);
 735                         terms->term_good = xstrdup(arg);
 736                 } else if (!strcmp(arg, "--term-bad") ||
 737                          !strcmp(arg, "--term-new")) {
 738                         i++;
 739                         if (argc <= i)
 740                                 return error(_("'' is not a valid term"));
 741                         must_write_terms = 1;
 742                         free((void *) terms->term_bad);
 743                         terms->term_bad = xstrdup(argv[i]);
 744                 } else if (skip_prefix(arg, "--term-bad=", &arg) ||
 745                            skip_prefix(arg, "--term-new=", &arg)) {
 746                         must_write_terms = 1;
 747                         free((void *) terms->term_bad);
 748                         terms->term_bad = xstrdup(arg);
 749                 } else if (starts_with(arg, "--")) {
 750                         return error(_("unrecognized option: '%s'"), arg);
 751                 } else if (!get_oidf(&oid, "%s^{commit}", arg)) {
 752                         string_list_append(&revs, oid_to_hex(&oid));
 753                 } else if (has_double_dash) {
 754                         die(_("'%s' does not appear to be a valid "
 755                               "revision"), arg);
 756                 } else {
 757                         break;
 758                 }
 759         }
 760         pathspec_pos = i;
 761
 762         /*
 763          * The user ran "git bisect start <sha1> <sha1>", hence did not
 764          * explicitly specify the terms, but we are already starting to
 765          * set references named with the default terms, and won't be able
 766          * to change afterwards.
 767          */
 768         if (revs.nr)
 769                 must_write_terms = 1;
 770         for (i = 0; i < revs.nr; i++) {
 771                 if (bad_seen) {
 772                         string_list_append(&states, terms->term_good);
 773                 } else {
 774                         bad_seen = 1;
 775                         string_list_append(&states, terms->term_bad);
 776                 }
 777         }
 778
 779         /*
 780          * Verify HEAD
 781          */
 782         head = resolve_ref_unsafe("HEAD", 0, &head_oid, &flags);
 783         if (!head)
 784                 if (repo_get_oid(the_repository, "HEAD", &head_oid))
 785                         return error(_("bad HEAD - I need a HEAD"));
 786
 787         /*
 788          * Check if we are bisecting
 789          */
 790         if (!is_empty_or_missing_file(git_path_bisect_start())) {
 791                 /* Reset to the rev from where we started */
 792                 strbuf_read_file(&start_head, git_path_bisect_start(), 0);
 793                 strbuf_trim(&start_head);
 794                 if (!no_checkout) {
 795                         struct child_process cmd = CHILD_PROCESS_INIT;
 796
 797                         cmd.git_cmd = 1;
 798                         strvec_pushl(&cmd.args, "checkout", start_head.buf,
 799                                      "--", NULL);
 800                         if (run_command(&cmd)) {
 801                                 res = error(_("checking out '%s' failed."
 802                                                  " Try 'git bisect start "
 803                                                  "<valid-branch>'."),
 804                                                start_head.buf);
 805                                 goto finish;
 806                         }
 807                 }
 808         } else {
 809                 /* Get the rev from where we start. */
 810                 if (!repo_get_oid(the_repository, head, &head_oid) &&
 811                     !starts_with(head, "refs/heads/")) {
 812                         strbuf_reset(&start_head);
 813                         strbuf_addstr(&start_head, oid_to_hex(&head_oid));
 814                 } else if (!repo_get_oid(the_repository, head, &head_oid) &&
 815                            skip_prefix(head, "refs/heads/", &head)) {
 816                         strbuf_addstr(&start_head, head);
 817                 } else {
 818                         return error(_("bad HEAD - strange symbolic ref"));
 819                 }
 820         }
 821
 822         /*
 823          * Get rid of any old bisect state.
 824          */
 825         if (bisect_clean_state())
 826                 return BISECT_FAILED;
 827
 828         /*
 829          * Write new start state
 830          */
 831         write_file(git_path_bisect_start(), "%s\n", start_head.buf);
 832
 833         if (first_parent_only)
 834                 write_file(git_path_bisect_first_parent(), "\n");
 835
 836         if (no_checkout) {
 837                 if (repo_get_oid(the_repository, start_head.buf, &oid) < 0) {
 838                         res = error(_("invalid ref: '%s'"), start_head.buf);
 839                         goto finish;
 840                 }
 841                 if (update_ref(NULL, "BISECT_HEAD", &oid, NULL, 0,
 842                                UPDATE_REFS_MSG_ON_ERR)) {
 843                         res = BISECT_FAILED;
 844                         goto finish;
 845                 }
 846         }
 847
 848         if (pathspec_pos < argc - 1)
 849                 sq_quote_argv(&bisect_names, argv + pathspec_pos);
 850         write_file(git_path_bisect_names(), "%s\n", bisect_names.buf);
 851
 852         for (i = 0; i < states.nr; i++)
 853                 if (bisect_write(states.items[i].string,
 854                                  revs.items[i].string, terms, 1)) {
 855                         res = BISECT_FAILED;
 856                         goto finish;
 857                 }
 858
 859         if (must_write_terms && write_terms(terms->term_bad,
 860                                             terms->term_good)) {
 861                 res = BISECT_FAILED;
 862                 goto finish;
 863         }
 864
 865         res = bisect_append_log_quoted(argv);
 866         if (res)
 867                 res = BISECT_FAILED;
 868
 869 finish:
 870         string_list_clear(&revs, 0);
 871         string_list_clear(&states, 0);
 872         strbuf_release(&start_head);
 873         strbuf_release(&bisect_names);
 874         if (res)
 875                 return res;
 876
 877         res = bisect_auto_next(terms, NULL);
 878         if (!is_bisect_success(res))
 879                 bisect_clean_state();
 880         return res;
 881 }
 882
 883 static inline int file_is_not_empty(const char *path)
 884 {
 885         return !is_empty_or_missing_file(path);
 886 }
 887
 888 static int bisect_autostart(struct bisect_terms *terms)
 889 {
 890         int res;
 891         const char *yesno;
 892
 893         if (file_is_not_empty(git_path_bisect_start()))
 894                 return 0;
 895
 896         fprintf_ln(stderr, _("You need to start by \"git bisect "
 897                           "start\"\n"));
 898
 899         if (!isatty(STDIN_FILENO))
 900                 return -1;
 901
 902         /*
 903          * TRANSLATORS: Make sure to include [Y] and [n] in your
 904          * translation. The program will only accept English input
 905          * at this point.
 906          */
 907         yesno = git_prompt(_("Do you want me to do it for you "
 908                              "[Y/n]? "), PROMPT_ECHO);
 909         res = tolower(*yesno) == 'n' ?
 910                 -1 : bisect_start(terms, 0, empty_strvec);
 911
 912         return res;
 913 }
 914
 915 static enum bisect_error bisect_state(struct bisect_terms *terms, int argc,
 916                                       const char **argv)
 917 {
 918         const char *state;
 919         int i, verify_expected = 1;
 920         struct object_id oid, expected;
 921         struct oid_array revs = OID_ARRAY_INIT;
 922
 923         if (!argc)
 924                 return error(_("Please call `--bisect-state` with at least one argument"));
 925
 926         if (bisect_autostart(terms))
 927                 return BISECT_FAILED;
 928
 929         state = argv[0];
 930         if (check_and_set_terms(terms, state) ||
 931             !one_of(state, terms->term_good, terms->term_bad, "skip", NULL))
 932                 return BISECT_FAILED;
 933
 934         argv++;
 935         argc--;
 936         if (argc > 1 && !strcmp(state, terms->term_bad))
 937                 return error(_("'git bisect %s' can take only one argument."), terms->term_bad);
 938
 939         if (argc == 0) {
 940                 const char *head = "BISECT_HEAD";
 941                 enum get_oid_result res_head = repo_get_oid(the_repository,
 942                                                             head, &oid);
 943
 944                 if (res_head == MISSING_OBJECT) {
 945                         head = "HEAD";
 946                         res_head = repo_get_oid(the_repository, head, &oid);
 947                 }
 948
 949                 if (res_head)
 950                         error(_("Bad rev input: %s"), head);
 951                 oid_array_append(&revs, &oid);
 952         }
 953
 954         /*
 955          * All input revs must be checked before executing bisect_write()
 956          * to discard junk revs.
 957          */
 958
 959         for (; argc; argc--, argv++) {
 960                 struct commit *commit;
 961
 962                 if (repo_get_oid(the_repository, *argv, &oid)){
 963                         error(_("Bad rev input: %s"), *argv);
 964                         oid_array_clear(&revs);
 965                         return BISECT_FAILED;
 966                 }
 967
 968                 commit = lookup_commit_reference(the_repository, &oid);
 969                 if (!commit)
 970                         die(_("Bad rev input (not a commit): %s"), *argv);
 971
 972                 oid_array_append(&revs, &commit->object.oid);
 973         }
 974
 975         if (read_ref("BISECT_EXPECTED_REV", &expected))
 976                 verify_expected = 0; /* Ignore invalid file contents */
 977
 978         for (i = 0; i < revs.nr; i++) {
 979                 if (bisect_write(state, oid_to_hex(&revs.oid[i]), terms, 0)) {
 980                         oid_array_clear(&revs);
 981                         return BISECT_FAILED;
 982                 }
 983                 if (verify_expected && !oideq(&revs.oid[i], &expected)) {
 984                         unlink_or_warn(git_path_bisect_ancestors_ok());
 985                         delete_ref(NULL, "BISECT_EXPECTED_REV", NULL, REF_NO_DEREF);
 986                         verify_expected = 0;
 987                 }
 988         }
 989
 990         oid_array_clear(&revs);
 991         return bisect_auto_next(terms, NULL);
 992 }
 993
 994 static enum bisect_error bisect_log(void)
 995 {
 996         int fd, status;
 997         const char* filename = git_path_bisect_log();
 998
 999         if (is_empty_or_missing_file(filename))
1000                 return error(_("We are not bisecting."));
1001
1002         fd = open(filename, O_RDONLY);
1003         if (fd < 0)
1004                 return BISECT_FAILED;
1005
1006         status = copy_fd(fd, STDOUT_FILENO);
1007         close(fd);
1008         return status ? BISECT_FAILED : BISECT_OK;
1009 }
1010
1011 static int process_replay_line(struct bisect_terms *terms, struct strbuf *line)
1012 {
1013         const char *p = line->buf + strspn(line->buf, " \t");
1014         char *word_end, *rev;
1015
1016         if ((!skip_prefix(p, "git bisect", &p) &&
1017         !skip_prefix(p, "git-bisect", &p)) || !isspace(*p))
1018                 return 0;
1019         p += strspn(p, " \t");
1020
1021         word_end = (char *)p + strcspn(p, " \t");
1022         rev = word_end + strspn(word_end, " \t");
1023         *word_end = '\0'; /* NUL-terminate the word */
1024
1025         get_terms(terms);
1026         if (check_and_set_terms(terms, p))
1027                 return -1;
1028
1029         if (!strcmp(p, "start")) {
1030                 struct strvec argv = STRVEC_INIT;
1031                 int res;
1032                 sq_dequote_to_strvec(rev, &argv);
1033                 res = bisect_start(terms, argv.nr, argv.v);
1034                 strvec_clear(&argv);
1035                 return res;
1036         }
1037
1038         if (one_of(p, terms->term_good,
1039            terms->term_bad, "skip", NULL))
1040                 return bisect_write(p, rev, terms, 0);
1041
1042         if (!strcmp(p, "terms")) {
1043                 struct strvec argv = STRVEC_INIT;
1044                 int res;
1045                 sq_dequote_to_strvec(rev, &argv);
1046                 res = bisect_terms(terms, argv.nr == 1 ? argv.v[0] : NULL);
1047                 strvec_clear(&argv);
1048                 return res;
1049         }
1050         error(_("'%s'?? what are you talking about?"), p);
1051
1052         return -1;
1053 }
1054
1055 static enum bisect_error bisect_replay(struct bisect_terms *terms, const char *filename)
1056 {
1057         FILE *fp = NULL;
1058         enum bisect_error res = BISECT_OK;
1059         struct strbuf line = STRBUF_INIT;
1060
1061         if (is_empty_or_missing_file(filename))
1062                 return error(_("cannot read file '%s' for replaying"), filename);
1063
1064         if (bisect_reset(NULL))
1065                 return BISECT_FAILED;
1066
1067         fp = fopen(filename, "r");
1068         if (!fp)
1069                 return BISECT_FAILED;
1070
1071         while ((strbuf_getline(&line, fp) != EOF) && !res)
1072                 res = process_replay_line(terms, &line);
1073
1074         strbuf_release(&line);
1075         fclose(fp);
1076
1077         if (res)
1078                 return BISECT_FAILED;
1079
1080         return bisect_auto_next(terms, NULL);
1081 }
1082
1083 static enum bisect_error bisect_skip(struct bisect_terms *terms, int argc,
1084                                      const char **argv)
1085 {
1086         int i;
1087         enum bisect_error res;
1088         struct strvec argv_state = STRVEC_INIT;
1089
1090         strvec_push(&argv_state, "skip");
1091
1092         for (i = 0; i < argc; i++) {
1093                 const char *dotdot = strstr(argv[i], "..");
1094
1095                 if (dotdot) {
1096                         struct rev_info revs;
1097                         struct commit *commit;
1098
1099                         repo_init_revisions(the_repository, &revs, NULL);
1100                         setup_revisions(2, argv + i - 1, &revs, NULL);
1101
1102                         if (prepare_revision_walk(&revs))
1103                                 die(_("revision walk setup failed\n"));
1104                         while ((commit = get_revision(&revs)) != NULL)
1105                                 strvec_push(&argv_state,
1106                                                 oid_to_hex(&commit->object.oid));
1107
1108                         reset_revision_walk();
1109                         release_revisions(&revs);
1110                 } else {
1111                         strvec_push(&argv_state, argv[i]);
1112                 }
1113         }
1114         res = bisect_state(terms, argv_state.nr, argv_state.v);
1115
1116         strvec_clear(&argv_state);
1117         return res;
1118 }
1119
1120 static int bisect_visualize(struct bisect_terms *terms, int argc,
1121                             const char **argv)
1122 {
1123         struct child_process cmd = CHILD_PROCESS_INIT;
1124         struct strbuf sb = STRBUF_INIT;
1125
1126         if (bisect_next_check(terms, NULL) != 0)
1127                 return BISECT_FAILED;
1128
1129         cmd.no_stdin = 1;
1130         if (!argc) {
1131                 if ((getenv("DISPLAY") || getenv("SESSIONNAME") || getenv("MSYSTEM") ||
1132                      getenv("SECURITYSESSIONID")) && exists_in_PATH("gitk")) {
1133                         strvec_push(&cmd.args, "gitk");
1134                 } else {
1135                         strvec_push(&cmd.args, "log");
1136                         cmd.git_cmd = 1;
1137                 }
1138         } else {
1139                 if (argv[0][0] == '-') {
1140                         strvec_push(&cmd.args, "log");
1141                         cmd.git_cmd = 1;
1142                 } else if (strcmp(argv[0], "tig") && !starts_with(argv[0], "git"))
1143                         cmd.git_cmd = 1;
1144
1145                 strvec_pushv(&cmd.args, argv);
1146         }
1147
1148         strvec_pushl(&cmd.args, "--bisect", "--", NULL);
1149
1150         strbuf_read_file(&sb, git_path_bisect_names(), 0);
1151         sq_dequote_to_strvec(sb.buf, &cmd.args);
1152         strbuf_release(&sb);
1153
1154         return run_command(&cmd);
1155 }
1156
1157 static int get_first_good(const char *refname UNUSED,
1158                           const struct object_id *oid,
1159                           int flag UNUSED, void *cb_data)
1160 {
1161         oidcpy(cb_data, oid);
1162         return 1;
1163 }
1164
1165 static int do_bisect_run(const char *command)
1166 {
1167         struct child_process cmd = CHILD_PROCESS_INIT;
1168
1169         printf(_("running %s\n"), command);
1170         cmd.use_shell = 1;
1171         strvec_push(&cmd.args, command);
1172         return run_command(&cmd);
1173 }
1174
1175 static int verify_good(const struct bisect_terms *terms, const char *command)
1176 {
1177         int rc;
1178         enum bisect_error res;
1179         struct object_id good_rev;
1180         struct object_id current_rev;
1181         char *good_glob = xstrfmt("%s-*", terms->term_good);
1182         int no_checkout = ref_exists("BISECT_HEAD");
1183
1184         for_each_glob_ref_in(get_first_good, good_glob, "refs/bisect/",
1185                              &good_rev);
1186         free(good_glob);
1187
1188         if (read_ref(no_checkout ? "BISECT_HEAD" : "HEAD", &current_rev))
1189                 return -1;
1190
1191         res = bisect_checkout(&good_rev, no_checkout);
1192         if (res != BISECT_OK)
1193                 return -1;
1194
1195         rc = do_bisect_run(command);
1196
1197         res = bisect_checkout(&current_rev, no_checkout);
1198         if (res != BISECT_OK)
1199                 return -1;
1200
1201         return rc;
1202 }
1203
1204 static int bisect_run(struct bisect_terms *terms, int argc, const char **argv)
1205 {
1206         int res = BISECT_OK;
1207         struct strbuf command = STRBUF_INIT;
1208         const char *new_state;
1209         int temporary_stdout_fd, saved_stdout;
1210         int is_first_run = 1;
1211
1212         if (bisect_next_check(terms, NULL))
1213                 return BISECT_FAILED;
1214
1215         if (!argc) {
1216                 error(_("bisect run failed: no command provided."));
1217                 return BISECT_FAILED;
1218         }
1219
1220         sq_quote_argv(&command, argv);
1221         strbuf_ltrim(&command);
1222         while (1) {
1223                 res = do_bisect_run(command.buf);
1224
1225                 /*
1226                  * Exit code 126 and 127 can either come from the shell
1227                  * if it was unable to execute or even find the script,
1228                  * or from the script itself.  Check with a known-good
1229                  * revision to avoid trashing the bisect run due to a
1230                  * missing or non-executable script.
1231                  */
1232                 if (is_first_run && (res == 126 || res == 127)) {
1233                         int rc = verify_good(terms, command.buf);
1234                         is_first_run = 0;
1235                         if (rc < 0 || 128 <= rc) {
1236                                 error(_("unable to verify %s on good"
1237                                         " revision"), command.buf);
1238                                 res = BISECT_FAILED;
1239                                 break;
1240                         }
1241                         if (rc == res) {
1242                                 error(_("bogus exit code %d for good revision"),
1243                                       rc);
1244                                 res = BISECT_FAILED;
1245                                 break;
1246                         }
1247                 }
1248
1249                 if (res < 0 || 128 <= res) {
1250                         error(_("bisect run failed: exit code %d from"
1251                                 " %s is < 0 or >= 128"), res, command.buf);
1252                         break;
1253                 }
1254
1255                 if (res == 125)
1256                         new_state = "skip";
1257                 else if (!res)
1258                         new_state = terms->term_good;
1259                 else
1260                         new_state = terms->term_bad;
1261
1262                 temporary_stdout_fd = open(git_path_bisect_run(), O_CREAT | O_WRONLY | O_TRUNC, 0666);
1263
1264                 if (temporary_stdout_fd < 0) {
1265                         res = error_errno(_("cannot open file '%s' for writing"), git_path_bisect_run());
1266                         break;
1267                 }
1268
1269                 fflush(stdout);
1270                 saved_stdout = dup(1);
1271                 dup2(temporary_stdout_fd, 1);
1272
1273                 res = bisect_state(terms, 1, &new_state);
1274
1275                 fflush(stdout);
1276                 dup2(saved_stdout, 1);
1277                 close(saved_stdout);
1278                 close(temporary_stdout_fd);
1279
1280                 print_file_to_stdout(git_path_bisect_run());
1281
1282                 if (res == BISECT_ONLY_SKIPPED_LEFT)
1283                         error(_("bisect run cannot continue any more"));
1284                 else if (res == BISECT_INTERNAL_SUCCESS_MERGE_BASE) {
1285                         puts(_("bisect run success"));
1286                         res = BISECT_OK;
1287                 } else if (res == BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND) {
1288                         puts(_("bisect found first bad commit"));
1289                         res = BISECT_OK;
1290                 } else if (res) {
1291                         error(_("bisect run failed: 'git bisect %s'"
1292                                 " exited with error code %d"), new_state, res);
1293                 } else {
1294                         continue;
1295                 }
1296                 break;
1297         }
1298
1299         strbuf_release(&command);
1300         return res;
1301 }
1302
1303 static int cmd_bisect__reset(int argc, const char **argv, const char *prefix UNUSED)
1304 {
1305         if (argc > 1)
1306                 return error(_("'%s' requires either no argument or a commit"),
1307                              "git bisect reset");
1308         return bisect_reset(argc ? argv[0] : NULL);
1309 }
1310
1311 static int cmd_bisect__terms(int argc, const char **argv, const char *prefix UNUSED)
1312 {
1313         int res;
1314         struct bisect_terms terms = { 0 };
1315
1316         if (argc > 1)
1317                 return error(_("'%s' requires 0 or 1 argument"),
1318                              "git bisect terms");
1319         res = bisect_terms(&terms, argc == 1 ? argv[0] : NULL);
1320         free_terms(&terms);
1321         return res;
1322 }
1323
1324 static int cmd_bisect__start(int argc, const char **argv, const char *prefix UNUSED)
1325 {
1326         int res;
1327         struct bisect_terms terms = { 0 };
1328
1329         set_terms(&terms, "bad", "good");
1330         res = bisect_start(&terms, argc, argv);
1331         free_terms(&terms);
1332         return res;
1333 }
1334
1335 static int cmd_bisect__next(int argc, const char **argv UNUSED, const char *prefix)
1336 {
1337         int res;
1338         struct bisect_terms terms = { 0 };
1339
1340         if (argc)
1341                 return error(_("'%s' requires 0 arguments"),
1342                              "git bisect next");
1343         get_terms(&terms);
1344         res = bisect_next(&terms, prefix);
1345         free_terms(&terms);
1346         return res;
1347 }
1348
1349 static int cmd_bisect__log(int argc UNUSED, const char **argv UNUSED, const char *prefix UNUSED)
1350 {
1351         return bisect_log();
1352 }
1353
1354 static int cmd_bisect__replay(int argc, const char **argv, const char *prefix UNUSED)
1355 {
1356         int res;
1357         struct bisect_terms terms = { 0 };
1358
1359         if (argc != 1)
1360                 return error(_("no logfile given"));
1361         set_terms(&terms, "bad", "good");
1362         res = bisect_replay(&terms, argv[0]);
1363         free_terms(&terms);
1364         return res;
1365 }
1366
1367 static int cmd_bisect__skip(int argc, const char **argv, const char *prefix UNUSED)
1368 {
1369         int res;
1370         struct bisect_terms terms = { 0 };
1371
1372         set_terms(&terms, "bad", "good");
1373         get_terms(&terms);
1374         res = bisect_skip(&terms, argc, argv);
1375         free_terms(&terms);
1376         return res;
1377 }
1378
1379 static int cmd_bisect__visualize(int argc, const char **argv, const char *prefix UNUSED)
1380 {
1381         int res;
1382         struct bisect_terms terms = { 0 };
1383
1384         get_terms(&terms);
1385         res = bisect_visualize(&terms, argc, argv);
1386         free_terms(&terms);
1387         return res;
1388 }
1389
1390 static int cmd_bisect__run(int argc, const char **argv, const char *prefix UNUSED)
1391 {
1392         int res;
1393         struct bisect_terms terms = { 0 };
1394
1395         if (!argc)
1396                 return error(_("'%s' failed: no command provided."), "git bisect run");
1397         get_terms(&terms);
1398         res = bisect_run(&terms, argc, argv);
1399         free_terms(&terms);
1400         return res;
1401 }
1402
1403 int cmd_bisect(int argc, const char **argv, const char *prefix)
1404 {
1405         int res = 0;
1406         parse_opt_subcommand_fn *fn = NULL;
1407         struct option options[] = {
1408                 OPT_SUBCOMMAND("reset", &fn, cmd_bisect__reset),
1409                 OPT_SUBCOMMAND("terms", &fn, cmd_bisect__terms),
1410                 OPT_SUBCOMMAND("start", &fn, cmd_bisect__start),
1411                 OPT_SUBCOMMAND("next", &fn, cmd_bisect__next),
1412                 OPT_SUBCOMMAND("log", &fn, cmd_bisect__log),
1413                 OPT_SUBCOMMAND("replay", &fn, cmd_bisect__replay),
1414                 OPT_SUBCOMMAND("skip", &fn, cmd_bisect__skip),
1415                 OPT_SUBCOMMAND("visualize", &fn, cmd_bisect__visualize),
1416                 OPT_SUBCOMMAND("view", &fn, cmd_bisect__visualize),
1417                 OPT_SUBCOMMAND("run", &fn, cmd_bisect__run),
1418                 OPT_END()
1419         };
1420         argc = parse_options(argc, argv, prefix, options, git_bisect_usage,
1421                              PARSE_OPT_SUBCOMMAND_OPTIONAL);
1422
1423         if (!fn) {
1424                 struct bisect_terms terms = { 0 };
1425
1426                 if (!argc)
1427                         usage_msg_opt(_("need a command"), git_bisect_usage, options);
1428
1429                 set_terms(&terms, "bad", "good");
1430                 get_terms(&terms);
1431                 if (check_and_set_terms(&terms, argv[0]))
1432                         usage_msg_optf(_("unknown command: '%s'"), git_bisect_usage,
1433                                        options, argv[0]);
1434                 res = bisect_state(&terms, argc, argv);
1435                 free_terms(&terms);
1436         } else {
1437                 argc--;
1438                 argv++;
1439                 res = fn(argc, argv, prefix);
1440         }
1441
1442         return is_bisect_success(res) ? 0 : -res;
1443 }