builtin/bisect.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "environment.h"
   4 #include "gettext.h"
   5 #include "hex.h"
   6 #include "parse-options.h"
   7 #include "bisect.h"
   8 #include "refs.h"
   9 #include "dir.h"
  10 #include "strvec.h"
  11 #include "run-command.h"
  12 #include "prompt.h"
  13 #include "quote.h"
  14 #include "revision.h"
  15 #include "wrapper.h"
  16
  17 static GIT_PATH_FUNC(git_path_bisect_terms, "BISECT_TERMS")
  18 static GIT_PATH_FUNC(git_path_bisect_expected_rev, "BISECT_EXPECTED_REV")
  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>...")
  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) < 1) {
 235                         printf(_("We are not bisecting.\n"));
 236                         return 0;
 237                 }
 238                 strbuf_rtrim(&branch);
 239         } else {
 240                 struct object_id oid;
 241
 242                 if (repo_get_oid_commit(the_repository, commit, &oid))
 243                         return error(_("'%s' is not a valid commit"), commit);
 244                 strbuf_addstr(&branch, commit);
 245         }
 246
 247         if (!ref_exists("BISECT_HEAD")) {
 248                 struct child_process cmd = CHILD_PROCESS_INIT;
 249
 250                 cmd.git_cmd = 1;
 251                 strvec_pushl(&cmd.args, "checkout", "--ignore-other-worktrees",
 252                                 branch.buf, "--", NULL);
 253                 if (run_command(&cmd)) {
 254                         error(_("could not check out original"
 255                                 " HEAD '%s'. Try 'git bisect"
 256                                 " reset <commit>'."), branch.buf);
 257                         strbuf_release(&branch);
 258                         return -1;
 259                 }
 260         }
 261
 262         strbuf_release(&branch);
 263         return bisect_clean_state();
 264 }
 265
 266 static void log_commit(FILE *fp, char *fmt, const char *state,
 267                        struct commit *commit)
 268 {
 269         struct pretty_print_context pp = {0};
 270         struct strbuf commit_msg = STRBUF_INIT;
 271         char *label = xstrfmt(fmt, state);
 272
 273         repo_format_commit_message(the_repository, commit, "%s", &commit_msg,
 274                                    &pp);
 275
 276         fprintf(fp, "# %s: [%s] %s\n", label, oid_to_hex(&commit->object.oid),
 277                 commit_msg.buf);
 278
 279         strbuf_release(&commit_msg);
 280         free(label);
 281 }
 282
 283 static int bisect_write(const char *state, const char *rev,
 284                         const struct bisect_terms *terms, int nolog)
 285 {
 286         struct strbuf tag = STRBUF_INIT;
 287         struct object_id oid;
 288         struct commit *commit;
 289         FILE *fp = NULL;
 290         int res = 0;
 291
 292         if (!strcmp(state, terms->term_bad)) {
 293                 strbuf_addf(&tag, "refs/bisect/%s", state);
 294         } else if (one_of(state, terms->term_good, "skip", NULL)) {
 295                 strbuf_addf(&tag, "refs/bisect/%s-%s", state, rev);
 296         } else {
 297                 res = error(_("Bad bisect_write argument: %s"), state);
 298                 goto finish;
 299         }
 300
 301         if (repo_get_oid(the_repository, rev, &oid)) {
 302                 res = error(_("couldn't get the oid of the rev '%s'"), rev);
 303                 goto finish;
 304         }
 305
 306         if (update_ref(NULL, tag.buf, &oid, NULL, 0,
 307                        UPDATE_REFS_MSG_ON_ERR)) {
 308                 res = -1;
 309                 goto finish;
 310         }
 311
 312         fp = fopen(git_path_bisect_log(), "a");
 313         if (!fp) {
 314                 res = error_errno(_("couldn't open the file '%s'"), git_path_bisect_log());
 315                 goto finish;
 316         }
 317
 318         commit = lookup_commit_reference(the_repository, &oid);
 319         log_commit(fp, "%s", state, commit);
 320
 321         if (!nolog)
 322                 fprintf(fp, "git bisect %s %s\n", state, rev);
 323
 324 finish:
 325         if (fp)
 326                 fclose(fp);
 327         strbuf_release(&tag);
 328         return res;
 329 }
 330
 331 static int check_and_set_terms(struct bisect_terms *terms, const char *cmd)
 332 {
 333         int has_term_file = !is_empty_or_missing_file(git_path_bisect_terms());
 334
 335         if (one_of(cmd, "skip", "start", "terms", NULL))
 336                 return 0;
 337
 338         if (has_term_file && strcmp(cmd, terms->term_bad) &&
 339             strcmp(cmd, terms->term_good))
 340                 return error(_("Invalid command: you're currently in a "
 341                                 "%s/%s bisect"), terms->term_bad,
 342                                 terms->term_good);
 343
 344         if (!has_term_file) {
 345                 if (one_of(cmd, "bad", "good", NULL)) {
 346                         set_terms(terms, "bad", "good");
 347                         return write_terms(terms->term_bad, terms->term_good);
 348                 }
 349                 if (one_of(cmd, "new", "old", NULL)) {
 350                         set_terms(terms, "new", "old");
 351                         return write_terms(terms->term_bad, terms->term_good);
 352                 }
 353         }
 354
 355         return 0;
 356 }
 357
 358 static int inc_nr(const char *refname UNUSED,
 359                   const struct object_id *oid UNUSED,
 360                   int flag UNUSED, void *cb_data)
 361 {
 362         unsigned int *nr = (unsigned int *)cb_data;
 363         (*nr)++;
 364         return 0;
 365 }
 366
 367 static const char need_bad_and_good_revision_warning[] =
 368         N_("You need to give me at least one %s and %s revision.\n"
 369            "You can use \"git bisect %s\" and \"git bisect %s\" for that.");
 370
 371 static const char need_bisect_start_warning[] =
 372         N_("You need to start by \"git bisect start\".\n"
 373            "You then need to give me at least one %s and %s revision.\n"
 374            "You can use \"git bisect %s\" and \"git bisect %s\" for that.");
 375
 376 static int decide_next(const struct bisect_terms *terms,
 377                        const char *current_term, int missing_good,
 378                        int missing_bad)
 379 {
 380         if (!missing_good && !missing_bad)
 381                 return 0;
 382         if (!current_term)
 383                 return -1;
 384
 385         if (missing_good && !missing_bad &&
 386             !strcmp(current_term, terms->term_good)) {
 387                 char *yesno;
 388                 /*
 389                  * have bad (or new) but not good (or old). We could bisect
 390                  * although this is less optimum.
 391                  */
 392                 warning(_("bisecting only with a %s commit"), terms->term_bad);
 393                 if (!isatty(0))
 394                         return 0;
 395                 /*
 396                  * TRANSLATORS: Make sure to include [Y] and [n] in your
 397                  * translation. The program will only accept English input
 398                  * at this point.
 399                  */
 400                 yesno = git_prompt(_("Are you sure [Y/n]? "), PROMPT_ECHO);
 401                 if (starts_with(yesno, "N") || starts_with(yesno, "n"))
 402                         return -1;
 403                 return 0;
 404         }
 405
 406         if (!is_empty_or_missing_file(git_path_bisect_start()))
 407                 return error(_(need_bad_and_good_revision_warning),
 408                              vocab_bad, vocab_good, vocab_bad, vocab_good);
 409         else
 410                 return error(_(need_bisect_start_warning),
 411                              vocab_good, vocab_bad, vocab_good, vocab_bad);
 412 }
 413
 414 static void bisect_status(struct bisect_state *state,
 415                           const struct bisect_terms *terms)
 416 {
 417         char *bad_ref = xstrfmt("refs/bisect/%s", terms->term_bad);
 418         char *good_glob = xstrfmt("%s-*", terms->term_good);
 419
 420         if (ref_exists(bad_ref))
 421                 state->nr_bad = 1;
 422
 423         for_each_glob_ref_in(inc_nr, good_glob, "refs/bisect/",
 424                              (void *) &state->nr_good);
 425
 426         free(good_glob);
 427         free(bad_ref);
 428 }
 429
 430 __attribute__((format (printf, 1, 2)))
 431 static void bisect_log_printf(const char *fmt, ...)
 432 {
 433         struct strbuf buf = STRBUF_INIT;
 434         va_list ap;
 435
 436         va_start(ap, fmt);
 437         strbuf_vaddf(&buf, fmt, ap);
 438         va_end(ap);
 439
 440         printf("%s", buf.buf);
 441         append_to_file(git_path_bisect_log(), "# %s", buf.buf);
 442
 443         strbuf_release(&buf);
 444 }
 445
 446 static void bisect_print_status(const struct bisect_terms *terms)
 447 {
 448         struct bisect_state state = { 0 };
 449
 450         bisect_status(&state, terms);
 451
 452         /* If we had both, we'd already be started, and shouldn't get here. */
 453         if (state.nr_good && state.nr_bad)
 454                 return;
 455
 456         if (!state.nr_good && !state.nr_bad)
 457                 bisect_log_printf(_("status: waiting for both good and bad commits\n"));
 458         else if (state.nr_good)
 459                 bisect_log_printf(Q_("status: waiting for bad commit, %d good commit known\n",
 460                                      "status: waiting for bad commit, %d good commits known\n",
 461                                      state.nr_good), state.nr_good);
 462         else
 463                 bisect_log_printf(_("status: waiting for good commit(s), bad commit known\n"));
 464 }
 465
 466 static int bisect_next_check(const struct bisect_terms *terms,
 467                              const char *current_term)
 468 {
 469         struct bisect_state state = { 0 };
 470         bisect_status(&state, terms);
 471         return decide_next(terms, current_term, !state.nr_good, !state.nr_bad);
 472 }
 473
 474 static int get_terms(struct bisect_terms *terms)
 475 {
 476         struct strbuf str = STRBUF_INIT;
 477         FILE *fp = NULL;
 478         int res = 0;
 479
 480         fp = fopen(git_path_bisect_terms(), "r");
 481         if (!fp) {
 482                 res = -1;
 483                 goto finish;
 484         }
 485
 486         free_terms(terms);
 487         strbuf_getline_lf(&str, fp);
 488         terms->term_bad = strbuf_detach(&str, NULL);
 489         strbuf_getline_lf(&str, fp);
 490         terms->term_good = strbuf_detach(&str, NULL);
 491
 492 finish:
 493         if (fp)
 494                 fclose(fp);
 495         strbuf_release(&str);
 496         return res;
 497 }
 498
 499 static int bisect_terms(struct bisect_terms *terms, const char *option)
 500 {
 501         if (get_terms(terms))
 502                 return error(_("no terms defined"));
 503
 504         if (!option) {
 505                 printf(_("Your current terms are %s for the old state\n"
 506                          "and %s for the new state.\n"),
 507                        terms->term_good, terms->term_bad);
 508                 return 0;
 509         }
 510         if (one_of(option, "--term-good", "--term-old", NULL))
 511                 printf("%s\n", terms->term_good);
 512         else if (one_of(option, "--term-bad", "--term-new", NULL))
 513                 printf("%s\n", terms->term_bad);
 514         else
 515                 return error(_("invalid argument %s for 'git bisect terms'.\n"
 516                                "Supported options are: "
 517                                "--term-good|--term-old and "
 518                                "--term-bad|--term-new."), option);
 519
 520         return 0;
 521 }
 522
 523 static int bisect_append_log_quoted(const char **argv)
 524 {
 525         int res = 0;
 526         FILE *fp = fopen(git_path_bisect_log(), "a");
 527         struct strbuf orig_args = STRBUF_INIT;
 528
 529         if (!fp)
 530                 return -1;
 531
 532         if (fprintf(fp, "git bisect start") < 1) {
 533                 res = -1;
 534                 goto finish;
 535         }
 536
 537         sq_quote_argv(&orig_args, argv);
 538         if (fprintf(fp, "%s\n", orig_args.buf) < 1)
 539                 res = -1;
 540
 541 finish:
 542         fclose(fp);
 543         strbuf_release(&orig_args);
 544         return res;
 545 }
 546
 547 static int add_bisect_ref(const char *refname, const struct object_id *oid,
 548                           int flags UNUSED, void *cb)
 549 {
 550         struct add_bisect_ref_data *data = cb;
 551
 552         add_pending_oid(data->revs, refname, oid, data->object_flags);
 553
 554         return 0;
 555 }
 556
 557 static int prepare_revs(struct bisect_terms *terms, struct rev_info *revs)
 558 {
 559         int res = 0;
 560         struct add_bisect_ref_data cb = { revs };
 561         char *good = xstrfmt("%s-*", terms->term_good);
 562
 563         /*
 564          * We cannot use terms->term_bad directly in
 565          * for_each_glob_ref_in() and we have to append a '*' to it,
 566          * otherwise for_each_glob_ref_in() will append '/' and '*'.
 567          */
 568         char *bad = xstrfmt("%s*", terms->term_bad);
 569
 570         /*
 571          * It is important to reset the flags used by revision walks
 572          * as the previous call to bisect_next_all() in turn
 573          * sets up a revision walk.
 574          */
 575         reset_revision_walk();
 576         repo_init_revisions(the_repository, revs, NULL);
 577         setup_revisions(0, NULL, revs, NULL);
 578         for_each_glob_ref_in(add_bisect_ref, bad, "refs/bisect/", &cb);
 579         cb.object_flags = UNINTERESTING;
 580         for_each_glob_ref_in(add_bisect_ref, good, "refs/bisect/", &cb);
 581         if (prepare_revision_walk(revs))
 582                 res = error(_("revision walk setup failed\n"));
 583
 584         free(good);
 585         free(bad);
 586         return res;
 587 }
 588
 589 static int bisect_skipped_commits(struct bisect_terms *terms)
 590 {
 591         int res;
 592         FILE *fp = NULL;
 593         struct rev_info revs;
 594         struct commit *commit;
 595         struct pretty_print_context pp = {0};
 596         struct strbuf commit_name = STRBUF_INIT;
 597
 598         res = prepare_revs(terms, &revs);
 599         if (res)
 600                 return res;
 601
 602         fp = fopen(git_path_bisect_log(), "a");
 603         if (!fp)
 604                 return error_errno(_("could not open '%s' for appending"),
 605                                   git_path_bisect_log());
 606
 607         if (fprintf(fp, "# only skipped commits left to test\n") < 0)
 608                 return error_errno(_("failed to write to '%s'"), git_path_bisect_log());
 609
 610         while ((commit = get_revision(&revs)) != NULL) {
 611                 strbuf_reset(&commit_name);
 612                 repo_format_commit_message(the_repository, commit, "%s",
 613                                            &commit_name, &pp);
 614                 fprintf(fp, "# possible first %s commit: [%s] %s\n",
 615                         terms->term_bad, oid_to_hex(&commit->object.oid),
 616                         commit_name.buf);
 617         }
 618
 619         /*
 620          * Reset the flags used by revision walks in case
 621          * there is another revision walk after this one.
 622          */
 623         reset_revision_walk();
 624
 625         strbuf_release(&commit_name);
 626         release_revisions(&revs);
 627         fclose(fp);
 628         return 0;
 629 }
 630
 631 static int bisect_successful(struct bisect_terms *terms)
 632 {
 633         struct object_id oid;
 634         struct commit *commit;
 635         struct pretty_print_context pp = {0};
 636         struct strbuf commit_name = STRBUF_INIT;
 637         char *bad_ref = xstrfmt("refs/bisect/%s",terms->term_bad);
 638         int res;
 639
 640         read_ref(bad_ref, &oid);
 641         commit = lookup_commit_reference_by_name(bad_ref);
 642         repo_format_commit_message(the_repository, commit, "%s", &commit_name,
 643                                    &pp);
 644
 645         res = append_to_file(git_path_bisect_log(), "# first %s commit: [%s] %s\n",
 646                             terms->term_bad, oid_to_hex(&commit->object.oid),
 647                             commit_name.buf);
 648
 649         strbuf_release(&commit_name);
 650         free(bad_ref);
 651         return res;
 652 }
 653
 654 static enum bisect_error bisect_next(struct bisect_terms *terms, const char *prefix)
 655 {
 656         enum bisect_error res;
 657
 658         if (bisect_autostart(terms))
 659                 return BISECT_FAILED;
 660
 661         if (bisect_next_check(terms, terms->term_good))
 662                 return BISECT_FAILED;
 663
 664         /* Perform all bisection computation */
 665         res = bisect_next_all(the_repository, prefix);
 666
 667         if (res == BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND) {
 668                 res = bisect_successful(terms);
 669                 return res ? res : BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND;
 670         } else if (res == BISECT_ONLY_SKIPPED_LEFT) {
 671                 res = bisect_skipped_commits(terms);
 672                 return res ? res : BISECT_ONLY_SKIPPED_LEFT;
 673         }
 674         return res;
 675 }
 676
 677 static enum bisect_error bisect_auto_next(struct bisect_terms *terms, const char *prefix)
 678 {
 679         if (bisect_next_check(terms, NULL)) {
 680                 bisect_print_status(terms);
 681                 return BISECT_OK;
 682         }
 683
 684         return bisect_next(terms, prefix);
 685 }
 686
 687 static enum bisect_error bisect_start(struct bisect_terms *terms, int argc,
 688                                       const char **argv)
 689 {
 690         int no_checkout = 0;
 691         int first_parent_only = 0;
 692         int i, has_double_dash = 0, must_write_terms = 0, bad_seen = 0;
 693         int flags, pathspec_pos;
 694         enum bisect_error res = BISECT_OK;
 695         struct string_list revs = STRING_LIST_INIT_DUP;
 696         struct string_list states = STRING_LIST_INIT_DUP;
 697         struct strbuf start_head = STRBUF_INIT;
 698         struct strbuf bisect_names = STRBUF_INIT;
 699         struct object_id head_oid;
 700         struct object_id oid;
 701         const char *head;
 702
 703         if (is_bare_repository())
 704                 no_checkout = 1;
 705
 706         /*
 707          * Check for one bad and then some good revisions
 708          */
 709         for (i = 0; i < argc; i++) {
 710                 if (!strcmp(argv[i], "--")) {
 711                         has_double_dash = 1;
 712                         break;
 713                 }
 714         }
 715
 716         for (i = 0; i < argc; i++) {
 717                 const char *arg = argv[i];
 718                 if (!strcmp(argv[i], "--")) {
 719                         break;
 720                 } else if (!strcmp(arg, "--no-checkout")) {
 721                         no_checkout = 1;
 722                 } else if (!strcmp(arg, "--first-parent")) {
 723                         first_parent_only = 1;
 724                 } else if (!strcmp(arg, "--term-good") ||
 725                          !strcmp(arg, "--term-old")) {
 726                         i++;
 727                         if (argc <= i)
 728                                 return error(_("'' is not a valid term"));
 729                         must_write_terms = 1;
 730                         free((void *) terms->term_good);
 731                         terms->term_good = xstrdup(argv[i]);
 732                 } else if (skip_prefix(arg, "--term-good=", &arg) ||
 733                            skip_prefix(arg, "--term-old=", &arg)) {
 734                         must_write_terms = 1;
 735                         free((void *) terms->term_good);
 736                         terms->term_good = xstrdup(arg);
 737                 } else if (!strcmp(arg, "--term-bad") ||
 738                          !strcmp(arg, "--term-new")) {
 739                         i++;
 740                         if (argc <= i)
 741                                 return error(_("'' is not a valid term"));
 742                         must_write_terms = 1;
 743                         free((void *) terms->term_bad);
 744                         terms->term_bad = xstrdup(argv[i]);
 745                 } else if (skip_prefix(arg, "--term-bad=", &arg) ||
 746                            skip_prefix(arg, "--term-new=", &arg)) {
 747                         must_write_terms = 1;
 748                         free((void *) terms->term_bad);
 749                         terms->term_bad = xstrdup(arg);
 750                 } else if (starts_with(arg, "--")) {
 751                         return error(_("unrecognized option: '%s'"), arg);
 752                 } else if (!get_oidf(&oid, "%s^{commit}", arg)) {
 753                         string_list_append(&revs, oid_to_hex(&oid));
 754                 } else if (has_double_dash) {
 755                         die(_("'%s' does not appear to be a valid "
 756                               "revision"), arg);
 757                 } else {
 758                         break;
 759                 }
 760         }
 761         pathspec_pos = i;
 762
 763         /*
 764          * The user ran "git bisect start <sha1> <sha1>", hence did not
 765          * explicitly specify the terms, but we are already starting to
 766          * set references named with the default terms, and won't be able
 767          * to change afterwards.
 768          */
 769         if (revs.nr)
 770                 must_write_terms = 1;
 771         for (i = 0; i < revs.nr; i++) {
 772                 if (bad_seen) {
 773                         string_list_append(&states, terms->term_good);
 774                 } else {
 775                         bad_seen = 1;
 776                         string_list_append(&states, terms->term_bad);
 777                 }
 778         }
 779
 780         /*
 781          * Verify HEAD
 782          */
 783         head = resolve_ref_unsafe("HEAD", 0, &head_oid, &flags);
 784         if (!head)
 785                 if (repo_get_oid(the_repository, "HEAD", &head_oid))
 786                         return error(_("bad HEAD - I need a HEAD"));
 787
 788         /*
 789          * Check if we are bisecting
 790          */
 791         if (!is_empty_or_missing_file(git_path_bisect_start())) {
 792                 /* Reset to the rev from where we started */
 793                 strbuf_read_file(&start_head, git_path_bisect_start(), 0);
 794                 strbuf_trim(&start_head);
 795                 if (!no_checkout) {
 796                         struct child_process cmd = CHILD_PROCESS_INIT;
 797
 798                         cmd.git_cmd = 1;
 799                         strvec_pushl(&cmd.args, "checkout", start_head.buf,
 800                                      "--", NULL);
 801                         if (run_command(&cmd)) {
 802                                 res = error(_("checking out '%s' failed."
 803                                                  " Try 'git bisect start "
 804                                                  "<valid-branch>'."),
 805                                                start_head.buf);
 806                                 goto finish;
 807                         }
 808                 }
 809         } else {
 810                 /* Get the rev from where we start. */
 811                 if (!repo_get_oid(the_repository, head, &head_oid) &&
 812                     !starts_with(head, "refs/heads/")) {
 813                         strbuf_reset(&start_head);
 814                         strbuf_addstr(&start_head, oid_to_hex(&head_oid));
 815                 } else if (!repo_get_oid(the_repository, head, &head_oid) &&
 816                            skip_prefix(head, "refs/heads/", &head)) {
 817                         strbuf_addstr(&start_head, head);
 818                 } else {
 819                         return error(_("bad HEAD - strange symbolic ref"));
 820                 }
 821         }
 822
 823         /*
 824          * Get rid of any old bisect state.
 825          */
 826         if (bisect_clean_state())
 827                 return BISECT_FAILED;
 828
 829         /*
 830          * Write new start state
 831          */
 832         write_file(git_path_bisect_start(), "%s\n", start_head.buf);
 833
 834         if (first_parent_only)
 835                 write_file(git_path_bisect_first_parent(), "\n");
 836
 837         if (no_checkout) {
 838                 if (repo_get_oid(the_repository, start_head.buf, &oid) < 0) {
 839                         res = error(_("invalid ref: '%s'"), start_head.buf);
 840                         goto finish;
 841                 }
 842                 if (update_ref(NULL, "BISECT_HEAD", &oid, NULL, 0,
 843                                UPDATE_REFS_MSG_ON_ERR)) {
 844                         res = BISECT_FAILED;
 845                         goto finish;
 846                 }
 847         }
 848
 849         if (pathspec_pos < argc - 1)
 850                 sq_quote_argv(&bisect_names, argv + pathspec_pos);
 851         write_file(git_path_bisect_names(), "%s\n", bisect_names.buf);
 852
 853         for (i = 0; i < states.nr; i++)
 854                 if (bisect_write(states.items[i].string,
 855                                  revs.items[i].string, terms, 1)) {
 856                         res = BISECT_FAILED;
 857                         goto finish;
 858                 }
 859
 860         if (must_write_terms && write_terms(terms->term_bad,
 861                                             terms->term_good)) {
 862                 res = BISECT_FAILED;
 863                 goto finish;
 864         }
 865
 866         res = bisect_append_log_quoted(argv);
 867         if (res)
 868                 res = BISECT_FAILED;
 869
 870 finish:
 871         string_list_clear(&revs, 0);
 872         string_list_clear(&states, 0);
 873         strbuf_release(&start_head);
 874         strbuf_release(&bisect_names);
 875         if (res)
 876                 return res;
 877
 878         res = bisect_auto_next(terms, NULL);
 879         if (!is_bisect_success(res))
 880                 bisect_clean_state();
 881         return res;
 882 }
 883
 884 static inline int file_is_not_empty(const char *path)
 885 {
 886         return !is_empty_or_missing_file(path);
 887 }
 888
 889 static int bisect_autostart(struct bisect_terms *terms)
 890 {
 891         int res;
 892         const char *yesno;
 893
 894         if (file_is_not_empty(git_path_bisect_start()))
 895                 return 0;
 896
 897         fprintf_ln(stderr, _("You need to start by \"git bisect "
 898                           "start\"\n"));
 899
 900         if (!isatty(STDIN_FILENO))
 901                 return -1;
 902
 903         /*
 904          * TRANSLATORS: Make sure to include [Y] and [n] in your
 905          * translation. The program will only accept English input
 906          * at this point.
 907          */
 908         yesno = git_prompt(_("Do you want me to do it for you "
 909                              "[Y/n]? "), PROMPT_ECHO);
 910         res = tolower(*yesno) == 'n' ?
 911                 -1 : bisect_start(terms, 0, empty_strvec);
 912
 913         return res;
 914 }
 915
 916 static enum bisect_error bisect_state(struct bisect_terms *terms, int argc,
 917                                       const char **argv)
 918 {
 919         const char *state;
 920         int i, verify_expected = 1;
 921         struct object_id oid, expected;
 922         struct strbuf buf = STRBUF_INIT;
 923         struct oid_array revs = OID_ARRAY_INIT;
 924
 925         if (!argc)
 926                 return error(_("Please call `--bisect-state` with at least one argument"));
 927
 928         if (bisect_autostart(terms))
 929                 return BISECT_FAILED;
 930
 931         state = argv[0];
 932         if (check_and_set_terms(terms, state) ||
 933             !one_of(state, terms->term_good, terms->term_bad, "skip", NULL))
 934                 return BISECT_FAILED;
 935
 936         argv++;
 937         argc--;
 938         if (argc > 1 && !strcmp(state, terms->term_bad))
 939                 return error(_("'git bisect %s' can take only one argument."), terms->term_bad);
 940
 941         if (argc == 0) {
 942                 const char *head = "BISECT_HEAD";
 943                 enum get_oid_result res_head = repo_get_oid(the_repository,
 944                                                             head, &oid);
 945
 946                 if (res_head == MISSING_OBJECT) {
 947                         head = "HEAD";
 948                         res_head = repo_get_oid(the_repository, head, &oid);
 949                 }
 950
 951                 if (res_head)
 952                         error(_("Bad rev input: %s"), head);
 953                 oid_array_append(&revs, &oid);
 954         }
 955
 956         /*
 957          * All input revs must be checked before executing bisect_write()
 958          * to discard junk revs.
 959          */
 960
 961         for (; argc; argc--, argv++) {
 962                 struct commit *commit;
 963
 964                 if (repo_get_oid(the_repository, *argv, &oid)){
 965                         error(_("Bad rev input: %s"), *argv);
 966                         oid_array_clear(&revs);
 967                         return BISECT_FAILED;
 968                 }
 969
 970                 commit = lookup_commit_reference(the_repository, &oid);
 971                 if (!commit)
 972                         die(_("Bad rev input (not a commit): %s"), *argv);
 973
 974                 oid_array_append(&revs, &commit->object.oid);
 975         }
 976
 977         if (strbuf_read_file(&buf, git_path_bisect_expected_rev(), 0) < the_hash_algo->hexsz ||
 978             get_oid_hex(buf.buf, &expected) < 0)
 979                 verify_expected = 0; /* Ignore invalid file contents */
 980         strbuf_release(&buf);
 981
 982         for (i = 0; i < revs.nr; i++) {
 983                 if (bisect_write(state, oid_to_hex(&revs.oid[i]), terms, 0)) {
 984                         oid_array_clear(&revs);
 985                         return BISECT_FAILED;
 986                 }
 987                 if (verify_expected && !oideq(&revs.oid[i], &expected)) {
 988                         unlink_or_warn(git_path_bisect_ancestors_ok());
 989                         unlink_or_warn(git_path_bisect_expected_rev());
 990                         verify_expected = 0;
 991                 }
 992         }
 993
 994         oid_array_clear(&revs);
 995         return bisect_auto_next(terms, NULL);
 996 }
 997
 998 static enum bisect_error bisect_log(void)
 999 {
1000         int fd, status;
1001         const char* filename = git_path_bisect_log();
1002
1003         if (is_empty_or_missing_file(filename))
1004                 return error(_("We are not bisecting."));
1005
1006         fd = open(filename, O_RDONLY);
1007         if (fd < 0)
1008                 return BISECT_FAILED;
1009
1010         status = copy_fd(fd, STDOUT_FILENO);
1011         close(fd);
1012         return status ? BISECT_FAILED : BISECT_OK;
1013 }
1014
1015 static int process_replay_line(struct bisect_terms *terms, struct strbuf *line)
1016 {
1017         const char *p = line->buf + strspn(line->buf, " \t");
1018         char *word_end, *rev;
1019
1020         if ((!skip_prefix(p, "git bisect", &p) &&
1021         !skip_prefix(p, "git-bisect", &p)) || !isspace(*p))
1022                 return 0;
1023         p += strspn(p, " \t");
1024
1025         word_end = (char *)p + strcspn(p, " \t");
1026         rev = word_end + strspn(word_end, " \t");
1027         *word_end = '\0'; /* NUL-terminate the word */
1028
1029         get_terms(terms);
1030         if (check_and_set_terms(terms, p))
1031                 return -1;
1032
1033         if (!strcmp(p, "start")) {
1034                 struct strvec argv = STRVEC_INIT;
1035                 int res;
1036                 sq_dequote_to_strvec(rev, &argv);
1037                 res = bisect_start(terms, argv.nr, argv.v);
1038                 strvec_clear(&argv);
1039                 return res;
1040         }
1041
1042         if (one_of(p, terms->term_good,
1043            terms->term_bad, "skip", NULL))
1044                 return bisect_write(p, rev, terms, 0);
1045
1046         if (!strcmp(p, "terms")) {
1047                 struct strvec argv = STRVEC_INIT;
1048                 int res;
1049                 sq_dequote_to_strvec(rev, &argv);
1050                 res = bisect_terms(terms, argv.nr == 1 ? argv.v[0] : NULL);
1051                 strvec_clear(&argv);
1052                 return res;
1053         }
1054         error(_("'%s'?? what are you talking about?"), p);
1055
1056         return -1;
1057 }
1058
1059 static enum bisect_error bisect_replay(struct bisect_terms *terms, const char *filename)
1060 {
1061         FILE *fp = NULL;
1062         enum bisect_error res = BISECT_OK;
1063         struct strbuf line = STRBUF_INIT;
1064
1065         if (is_empty_or_missing_file(filename))
1066                 return error(_("cannot read file '%s' for replaying"), filename);
1067
1068         if (bisect_reset(NULL))
1069                 return BISECT_FAILED;
1070
1071         fp = fopen(filename, "r");
1072         if (!fp)
1073                 return BISECT_FAILED;
1074
1075         while ((strbuf_getline(&line, fp) != EOF) && !res)
1076                 res = process_replay_line(terms, &line);
1077
1078         strbuf_release(&line);
1079         fclose(fp);
1080
1081         if (res)
1082                 return BISECT_FAILED;
1083
1084         return bisect_auto_next(terms, NULL);
1085 }
1086
1087 static enum bisect_error bisect_skip(struct bisect_terms *terms, int argc,
1088                                      const char **argv)
1089 {
1090         int i;
1091         enum bisect_error res;
1092         struct strvec argv_state = STRVEC_INIT;
1093
1094         strvec_push(&argv_state, "skip");
1095
1096         for (i = 0; i < argc; i++) {
1097                 const char *dotdot = strstr(argv[i], "..");
1098
1099                 if (dotdot) {
1100                         struct rev_info revs;
1101                         struct commit *commit;
1102
1103                         repo_init_revisions(the_repository, &revs, NULL);
1104                         setup_revisions(2, argv + i - 1, &revs, NULL);
1105
1106                         if (prepare_revision_walk(&revs))
1107                                 die(_("revision walk setup failed\n"));
1108                         while ((commit = get_revision(&revs)) != NULL)
1109                                 strvec_push(&argv_state,
1110                                                 oid_to_hex(&commit->object.oid));
1111
1112                         reset_revision_walk();
1113                         release_revisions(&revs);
1114                 } else {
1115                         strvec_push(&argv_state, argv[i]);
1116                 }
1117         }
1118         res = bisect_state(terms, argv_state.nr, argv_state.v);
1119
1120         strvec_clear(&argv_state);
1121         return res;
1122 }
1123
1124 static int bisect_visualize(struct bisect_terms *terms, int argc,
1125                             const char **argv)
1126 {
1127         struct child_process cmd = CHILD_PROCESS_INIT;
1128         struct strbuf sb = STRBUF_INIT;
1129
1130         if (bisect_next_check(terms, NULL) != 0)
1131                 return BISECT_FAILED;
1132
1133         cmd.no_stdin = 1;
1134         if (!argc) {
1135                 if ((getenv("DISPLAY") || getenv("SESSIONNAME") || getenv("MSYSTEM") ||
1136                      getenv("SECURITYSESSIONID")) && exists_in_PATH("gitk")) {
1137                         strvec_push(&cmd.args, "gitk");
1138                 } else {
1139                         strvec_push(&cmd.args, "log");
1140                         cmd.git_cmd = 1;
1141                 }
1142         } else {
1143                 if (argv[0][0] == '-') {
1144                         strvec_push(&cmd.args, "log");
1145                         cmd.git_cmd = 1;
1146                 } else if (strcmp(argv[0], "tig") && !starts_with(argv[0], "git"))
1147                         cmd.git_cmd = 1;
1148
1149                 strvec_pushv(&cmd.args, argv);
1150         }
1151
1152         strvec_pushl(&cmd.args, "--bisect", "--", NULL);
1153
1154         strbuf_read_file(&sb, git_path_bisect_names(), 0);
1155         sq_dequote_to_strvec(sb.buf, &cmd.args);
1156         strbuf_release(&sb);
1157
1158         return run_command(&cmd);
1159 }
1160
1161 static int get_first_good(const char *refname UNUSED,
1162                           const struct object_id *oid,
1163                           int flag UNUSED, void *cb_data)
1164 {
1165         oidcpy(cb_data, oid);
1166         return 1;
1167 }
1168
1169 static int do_bisect_run(const char *command)
1170 {
1171         struct child_process cmd = CHILD_PROCESS_INIT;
1172
1173         printf(_("running %s\n"), command);
1174         cmd.use_shell = 1;
1175         strvec_push(&cmd.args, command);
1176         return run_command(&cmd);
1177 }
1178
1179 static int verify_good(const struct bisect_terms *terms, const char *command)
1180 {
1181         int rc;
1182         enum bisect_error res;
1183         struct object_id good_rev;
1184         struct object_id current_rev;
1185         char *good_glob = xstrfmt("%s-*", terms->term_good);
1186         int no_checkout = ref_exists("BISECT_HEAD");
1187
1188         for_each_glob_ref_in(get_first_good, good_glob, "refs/bisect/",
1189                              &good_rev);
1190         free(good_glob);
1191
1192         if (read_ref(no_checkout ? "BISECT_HEAD" : "HEAD", &current_rev))
1193                 return -1;
1194
1195         res = bisect_checkout(&good_rev, no_checkout);
1196         if (res != BISECT_OK)
1197                 return -1;
1198
1199         rc = do_bisect_run(command);
1200
1201         res = bisect_checkout(&current_rev, no_checkout);
1202         if (res != BISECT_OK)
1203                 return -1;
1204
1205         return rc;
1206 }
1207
1208 static int bisect_run(struct bisect_terms *terms, int argc, const char **argv)
1209 {
1210         int res = BISECT_OK;
1211         struct strbuf command = STRBUF_INIT;
1212         const char *new_state;
1213         int temporary_stdout_fd, saved_stdout;
1214         int is_first_run = 1;
1215
1216         if (bisect_next_check(terms, NULL))
1217                 return BISECT_FAILED;
1218
1219         if (!argc) {
1220                 error(_("bisect run failed: no command provided."));
1221                 return BISECT_FAILED;
1222         }
1223
1224         sq_quote_argv(&command, argv);
1225         strbuf_ltrim(&command);
1226         while (1) {
1227                 res = do_bisect_run(command.buf);
1228
1229                 /*
1230                  * Exit code 126 and 127 can either come from the shell
1231                  * if it was unable to execute or even find the script,
1232                  * or from the script itself.  Check with a known-good
1233                  * revision to avoid trashing the bisect run due to a
1234                  * missing or non-executable script.
1235                  */
1236                 if (is_first_run && (res == 126 || res == 127)) {
1237                         int rc = verify_good(terms, command.buf);
1238                         is_first_run = 0;
1239                         if (rc < 0 || 128 <= rc) {
1240                                 error(_("unable to verify %s on good"
1241                                         " revision"), command.buf);
1242                                 res = BISECT_FAILED;
1243                                 break;
1244                         }
1245                         if (rc == res) {
1246                                 error(_("bogus exit code %d for good revision"),
1247                                       rc);
1248                                 res = BISECT_FAILED;
1249                                 break;
1250                         }
1251                 }
1252
1253                 if (res < 0 || 128 <= res) {
1254                         error(_("bisect run failed: exit code %d from"
1255                                 " %s is < 0 or >= 128"), res, command.buf);
1256                         break;
1257                 }
1258
1259                 if (res == 125)
1260                         new_state = "skip";
1261                 else if (!res)
1262                         new_state = terms->term_good;
1263                 else
1264                         new_state = terms->term_bad;
1265
1266                 temporary_stdout_fd = open(git_path_bisect_run(), O_CREAT | O_WRONLY | O_TRUNC, 0666);
1267
1268                 if (temporary_stdout_fd < 0) {
1269                         res = error_errno(_("cannot open file '%s' for writing"), git_path_bisect_run());
1270                         break;
1271                 }
1272
1273                 fflush(stdout);
1274                 saved_stdout = dup(1);
1275                 dup2(temporary_stdout_fd, 1);
1276
1277                 res = bisect_state(terms, 1, &new_state);
1278
1279                 fflush(stdout);
1280                 dup2(saved_stdout, 1);
1281                 close(saved_stdout);
1282                 close(temporary_stdout_fd);
1283
1284                 print_file_to_stdout(git_path_bisect_run());
1285
1286                 if (res == BISECT_ONLY_SKIPPED_LEFT)
1287                         error(_("bisect run cannot continue any more"));
1288                 else if (res == BISECT_INTERNAL_SUCCESS_MERGE_BASE) {
1289                         puts(_("bisect run success"));
1290                         res = BISECT_OK;
1291                 } else if (res == BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND) {
1292                         puts(_("bisect found first bad commit"));
1293                         res = BISECT_OK;
1294                 } else if (res) {
1295                         error(_("bisect run failed: 'git bisect %s'"
1296                                 " exited with error code %d"), new_state, res);
1297                 } else {
1298                         continue;
1299                 }
1300                 break;
1301         }
1302
1303         strbuf_release(&command);
1304         return res;
1305 }
1306
1307 static int cmd_bisect__reset(int argc, const char **argv, const char *prefix UNUSED)
1308 {
1309         if (argc > 1)
1310                 return error(_("'%s' requires either no argument or a commit"),
1311                              "git bisect reset");
1312         return bisect_reset(argc ? argv[0] : NULL);
1313 }
1314
1315 static int cmd_bisect__terms(int argc, const char **argv, const char *prefix UNUSED)
1316 {
1317         int res;
1318         struct bisect_terms terms = { 0 };
1319
1320         if (argc > 1)
1321                 return error(_("'%s' requires 0 or 1 argument"),
1322                              "git bisect terms");
1323         res = bisect_terms(&terms, argc == 1 ? argv[0] : NULL);
1324         free_terms(&terms);
1325         return res;
1326 }
1327
1328 static int cmd_bisect__start(int argc, const char **argv, const char *prefix UNUSED)
1329 {
1330         int res;
1331         struct bisect_terms terms = { 0 };
1332
1333         set_terms(&terms, "bad", "good");
1334         res = bisect_start(&terms, argc, argv);
1335         free_terms(&terms);
1336         return res;
1337 }
1338
1339 static int cmd_bisect__next(int argc, const char **argv UNUSED, const char *prefix)
1340 {
1341         int res;
1342         struct bisect_terms terms = { 0 };
1343
1344         if (argc)
1345                 return error(_("'%s' requires 0 arguments"),
1346                              "git bisect next");
1347         get_terms(&terms);
1348         res = bisect_next(&terms, prefix);
1349         free_terms(&terms);
1350         return res;
1351 }
1352
1353 static int cmd_bisect__log(int argc UNUSED, const char **argv UNUSED, const char *prefix UNUSED)
1354 {
1355         return bisect_log();
1356 }
1357
1358 static int cmd_bisect__replay(int argc, const char **argv, const char *prefix UNUSED)
1359 {
1360         int res;
1361         struct bisect_terms terms = { 0 };
1362
1363         if (argc != 1)
1364                 return error(_("no logfile given"));
1365         set_terms(&terms, "bad", "good");
1366         res = bisect_replay(&terms, argv[0]);
1367         free_terms(&terms);
1368         return res;
1369 }
1370
1371 static int cmd_bisect__skip(int argc, const char **argv, const char *prefix UNUSED)
1372 {
1373         int res;
1374         struct bisect_terms terms = { 0 };
1375
1376         set_terms(&terms, "bad", "good");
1377         get_terms(&terms);
1378         res = bisect_skip(&terms, argc, argv);
1379         free_terms(&terms);
1380         return res;
1381 }
1382
1383 static int cmd_bisect__visualize(int argc, const char **argv, const char *prefix UNUSED)
1384 {
1385         int res;
1386         struct bisect_terms terms = { 0 };
1387
1388         get_terms(&terms);
1389         res = bisect_visualize(&terms, argc, argv);
1390         free_terms(&terms);
1391         return res;
1392 }
1393
1394 static int cmd_bisect__run(int argc, const char **argv, const char *prefix UNUSED)
1395 {
1396         int res;
1397         struct bisect_terms terms = { 0 };
1398
1399         if (!argc)
1400                 return error(_("'%s' failed: no command provided."), "git bisect run");
1401         get_terms(&terms);
1402         res = bisect_run(&terms, argc, argv);
1403         free_terms(&terms);
1404         return res;
1405 }
1406
1407 int cmd_bisect(int argc, const char **argv, const char *prefix)
1408 {
1409         int res = 0;
1410         parse_opt_subcommand_fn *fn = NULL;
1411         struct option options[] = {
1412                 OPT_SUBCOMMAND("reset", &fn, cmd_bisect__reset),
1413                 OPT_SUBCOMMAND("terms", &fn, cmd_bisect__terms),
1414                 OPT_SUBCOMMAND("start", &fn, cmd_bisect__start),
1415                 OPT_SUBCOMMAND("next", &fn, cmd_bisect__next),
1416                 OPT_SUBCOMMAND("log", &fn, cmd_bisect__log),
1417                 OPT_SUBCOMMAND("replay", &fn, cmd_bisect__replay),
1418                 OPT_SUBCOMMAND("skip", &fn, cmd_bisect__skip),
1419                 OPT_SUBCOMMAND("visualize", &fn, cmd_bisect__visualize),
1420                 OPT_SUBCOMMAND("view", &fn, cmd_bisect__visualize),
1421                 OPT_SUBCOMMAND("run", &fn, cmd_bisect__run),
1422                 OPT_END()
1423         };
1424         argc = parse_options(argc, argv, prefix, options, git_bisect_usage,
1425                              PARSE_OPT_SUBCOMMAND_OPTIONAL);
1426
1427         if (!fn) {
1428                 struct bisect_terms terms = { 0 };
1429
1430                 if (!argc)
1431                         usage_msg_opt(_("need a command"), git_bisect_usage, options);
1432
1433                 set_terms(&terms, "bad", "good");
1434                 get_terms(&terms);
1435                 if (check_and_set_terms(&terms, argv[0]))
1436                         usage_msg_optf(_("unknown command: '%s'"), git_bisect_usage,
1437                                        options, argv[0]);
1438                 res = bisect_state(&terms, argc, argv);
1439                 free_terms(&terms);
1440         } else {
1441                 argc--;
1442                 argv++;
1443                 res = fn(argc, argv, prefix);
1444         }
1445
1446         return is_bisect_success(res) ? 0 : -res;
1447 }