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-rw-r--r--builtin/bisect--helper.c1016
1 files changed, 1016 insertions, 0 deletions
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
new file mode 100644
index 0000000..709eb71
--- /dev/null
+++ b/builtin/bisect--helper.c
@@ -0,0 +1,1016 @@
+#include "builtin.h"
+#include "cache.h"
+#include "parse-options.h"
+#include "bisect.h"
+#include "refs.h"
+#include "dir.h"
+#include "strvec.h"
+#include "run-command.h"
+#include "prompt.h"
+#include "quote.h"
+#include "revision.h"
+
+static GIT_PATH_FUNC(git_path_bisect_terms, "BISECT_TERMS")
+static GIT_PATH_FUNC(git_path_bisect_expected_rev, "BISECT_EXPECTED_REV")
+static GIT_PATH_FUNC(git_path_bisect_ancestors_ok, "BISECT_ANCESTORS_OK")
+static GIT_PATH_FUNC(git_path_bisect_start, "BISECT_START")
+static GIT_PATH_FUNC(git_path_bisect_log, "BISECT_LOG")
+static GIT_PATH_FUNC(git_path_head_name, "head-name")
+static GIT_PATH_FUNC(git_path_bisect_names, "BISECT_NAMES")
+static GIT_PATH_FUNC(git_path_bisect_first_parent, "BISECT_FIRST_PARENT")
+
+static const char * const git_bisect_helper_usage[] = {
+ N_("git bisect--helper --bisect-reset [<commit>]"),
+ N_("git bisect--helper --bisect-write [--no-log] <state> <revision> <good_term> <bad_term>"),
+ N_("git bisect--helper --bisect-check-and-set-terms <command> <good_term> <bad_term>"),
+ N_("git bisect--helper --bisect-next-check <good_term> <bad_term> [<term>]"),
+ N_("git bisect--helper --bisect-terms [--term-good | --term-old | --term-bad | --term-new]"),
+ N_("git bisect--helper --bisect-start [--term-{new,bad}=<term> --term-{old,good}=<term>]"
+ " [--no-checkout] [--first-parent] [<bad> [<good>...]] [--] [<paths>...]"),
+ N_("git bisect--helper --bisect-next"),
+ N_("git bisect--helper --bisect-auto-next"),
+ N_("git bisect--helper --bisect-state (bad|new) [<rev>]"),
+ N_("git bisect--helper --bisect-state (good|old) [<rev>...]"),
+ NULL
+};
+
+struct add_bisect_ref_data {
+ struct rev_info *revs;
+ unsigned int object_flags;
+};
+
+struct bisect_terms {
+ char *term_good;
+ char *term_bad;
+};
+
+static void free_terms(struct bisect_terms *terms)
+{
+ FREE_AND_NULL(terms->term_good);
+ FREE_AND_NULL(terms->term_bad);
+}
+
+static void set_terms(struct bisect_terms *terms, const char *bad,
+ const char *good)
+{
+ free((void *)terms->term_good);
+ terms->term_good = xstrdup(good);
+ free((void *)terms->term_bad);
+ terms->term_bad = xstrdup(bad);
+}
+
+static const char vocab_bad[] = "bad|new";
+static const char vocab_good[] = "good|old";
+
+static int bisect_autostart(struct bisect_terms *terms);
+
+/*
+ * Check whether the string `term` belongs to the set of strings
+ * included in the variable arguments.
+ */
+LAST_ARG_MUST_BE_NULL
+static int one_of(const char *term, ...)
+{
+ int res = 0;
+ va_list matches;
+ const char *match;
+
+ va_start(matches, term);
+ while (!res && (match = va_arg(matches, const char *)))
+ res = !strcmp(term, match);
+ va_end(matches);
+
+ return res;
+}
+
+/*
+ * return code BISECT_INTERNAL_SUCCESS_MERGE_BASE
+ * and BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND are codes
+ * that indicate special success.
+ */
+
+static int is_bisect_success(enum bisect_error res)
+{
+ return !res ||
+ res == BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND ||
+ res == BISECT_INTERNAL_SUCCESS_MERGE_BASE;
+}
+
+static int write_in_file(const char *path, const char *mode, const char *format, va_list args)
+{
+ FILE *fp = NULL;
+ int res = 0;
+
+ if (strcmp(mode, "w") && strcmp(mode, "a"))
+ BUG("write-in-file does not support '%s' mode", mode);
+ fp = fopen(path, mode);
+ if (!fp)
+ return error_errno(_("cannot open file '%s' in mode '%s'"), path, mode);
+ res = vfprintf(fp, format, args);
+
+ if (res < 0) {
+ int saved_errno = errno;
+ fclose(fp);
+ errno = saved_errno;
+ return error_errno(_("could not write to file '%s'"), path);
+ }
+
+ return fclose(fp);
+}
+
+static int write_to_file(const char *path, const char *format, ...)
+{
+ int res;
+ va_list args;
+
+ va_start(args, format);
+ res = write_in_file(path, "w", format, args);
+ va_end(args);
+
+ return res;
+}
+
+static int append_to_file(const char *path, const char *format, ...)
+{
+ int res;
+ va_list args;
+
+ va_start(args, format);
+ res = write_in_file(path, "a", format, args);
+ va_end(args);
+
+ return res;
+}
+
+static int check_term_format(const char *term, const char *orig_term)
+{
+ int res;
+ char *new_term = xstrfmt("refs/bisect/%s", term);
+
+ res = check_refname_format(new_term, 0);
+ free(new_term);
+
+ if (res)
+ return error(_("'%s' is not a valid term"), term);
+
+ if (one_of(term, "help", "start", "skip", "next", "reset",
+ "visualize", "view", "replay", "log", "run", "terms", NULL))
+ return error(_("can't use the builtin command '%s' as a term"), term);
+
+ /*
+ * In theory, nothing prevents swapping completely good and bad,
+ * but this situation could be confusing and hasn't been tested
+ * enough. Forbid it for now.
+ */
+
+ if ((strcmp(orig_term, "bad") && one_of(term, "bad", "new", NULL)) ||
+ (strcmp(orig_term, "good") && one_of(term, "good", "old", NULL)))
+ return error(_("can't change the meaning of the term '%s'"), term);
+
+ return 0;
+}
+
+static int write_terms(const char *bad, const char *good)
+{
+ int res;
+
+ if (!strcmp(bad, good))
+ return error(_("please use two different terms"));
+
+ if (check_term_format(bad, "bad") || check_term_format(good, "good"))
+ return -1;
+
+ res = write_to_file(git_path_bisect_terms(), "%s\n%s\n", bad, good);
+
+ return res;
+}
+
+static int bisect_reset(const char *commit)
+{
+ struct strbuf branch = STRBUF_INIT;
+
+ if (!commit) {
+ if (strbuf_read_file(&branch, git_path_bisect_start(), 0) < 1) {
+ printf(_("We are not bisecting.\n"));
+ return 0;
+ }
+ strbuf_rtrim(&branch);
+ } else {
+ struct object_id oid;
+
+ if (get_oid_commit(commit, &oid))
+ return error(_("'%s' is not a valid commit"), commit);
+ strbuf_addstr(&branch, commit);
+ }
+
+ if (!ref_exists("BISECT_HEAD")) {
+ struct strvec argv = STRVEC_INIT;
+
+ strvec_pushl(&argv, "checkout", branch.buf, "--", NULL);
+ if (run_command_v_opt(argv.v, RUN_GIT_CMD)) {
+ error(_("could not check out original"
+ " HEAD '%s'. Try 'git bisect"
+ " reset <commit>'."), branch.buf);
+ strbuf_release(&branch);
+ strvec_clear(&argv);
+ return -1;
+ }
+ strvec_clear(&argv);
+ }
+
+ strbuf_release(&branch);
+ return bisect_clean_state();
+}
+
+static void log_commit(FILE *fp, char *fmt, const char *state,
+ struct commit *commit)
+{
+ struct pretty_print_context pp = {0};
+ struct strbuf commit_msg = STRBUF_INIT;
+ char *label = xstrfmt(fmt, state);
+
+ format_commit_message(commit, "%s", &commit_msg, &pp);
+
+ fprintf(fp, "# %s: [%s] %s\n", label, oid_to_hex(&commit->object.oid),
+ commit_msg.buf);
+
+ strbuf_release(&commit_msg);
+ free(label);
+}
+
+static int bisect_write(const char *state, const char *rev,
+ const struct bisect_terms *terms, int nolog)
+{
+ struct strbuf tag = STRBUF_INIT;
+ struct object_id oid;
+ struct commit *commit;
+ FILE *fp = NULL;
+ int res = 0;
+
+ if (!strcmp(state, terms->term_bad)) {
+ strbuf_addf(&tag, "refs/bisect/%s", state);
+ } else if (one_of(state, terms->term_good, "skip", NULL)) {
+ strbuf_addf(&tag, "refs/bisect/%s-%s", state, rev);
+ } else {
+ res = error(_("Bad bisect_write argument: %s"), state);
+ goto finish;
+ }
+
+ if (get_oid(rev, &oid)) {
+ res = error(_("couldn't get the oid of the rev '%s'"), rev);
+ goto finish;
+ }
+
+ if (update_ref(NULL, tag.buf, &oid, NULL, 0,
+ UPDATE_REFS_MSG_ON_ERR)) {
+ res = -1;
+ goto finish;
+ }
+
+ fp = fopen(git_path_bisect_log(), "a");
+ if (!fp) {
+ res = error_errno(_("couldn't open the file '%s'"), git_path_bisect_log());
+ goto finish;
+ }
+
+ commit = lookup_commit_reference(the_repository, &oid);
+ log_commit(fp, "%s", state, commit);
+
+ if (!nolog)
+ fprintf(fp, "git bisect %s %s\n", state, rev);
+
+finish:
+ if (fp)
+ fclose(fp);
+ strbuf_release(&tag);
+ return res;
+}
+
+static int check_and_set_terms(struct bisect_terms *terms, const char *cmd)
+{
+ int has_term_file = !is_empty_or_missing_file(git_path_bisect_terms());
+
+ if (one_of(cmd, "skip", "start", "terms", NULL))
+ return 0;
+
+ if (has_term_file && strcmp(cmd, terms->term_bad) &&
+ strcmp(cmd, terms->term_good))
+ return error(_("Invalid command: you're currently in a "
+ "%s/%s bisect"), terms->term_bad,
+ terms->term_good);
+
+ if (!has_term_file) {
+ if (one_of(cmd, "bad", "good", NULL)) {
+ set_terms(terms, "bad", "good");
+ return write_terms(terms->term_bad, terms->term_good);
+ }
+ if (one_of(cmd, "new", "old", NULL)) {
+ set_terms(terms, "new", "old");
+ return write_terms(terms->term_bad, terms->term_good);
+ }
+ }
+
+ return 0;
+}
+
+static int mark_good(const char *refname, const struct object_id *oid,
+ int flag, void *cb_data)
+{
+ int *m_good = (int *)cb_data;
+ *m_good = 0;
+ return 1;
+}
+
+static const char need_bad_and_good_revision_warning[] =
+ N_("You need to give me at least one %s and %s revision.\n"
+ "You can use \"git bisect %s\" and \"git bisect %s\" for that.");
+
+static const char need_bisect_start_warning[] =
+ N_("You need to start by \"git bisect start\".\n"
+ "You then need to give me at least one %s and %s revision.\n"
+ "You can use \"git bisect %s\" and \"git bisect %s\" for that.");
+
+static int decide_next(const struct bisect_terms *terms,
+ const char *current_term, int missing_good,
+ int missing_bad)
+{
+ if (!missing_good && !missing_bad)
+ return 0;
+ if (!current_term)
+ return -1;
+
+ if (missing_good && !missing_bad &&
+ !strcmp(current_term, terms->term_good)) {
+ char *yesno;
+ /*
+ * have bad (or new) but not good (or old). We could bisect
+ * although this is less optimum.
+ */
+ warning(_("bisecting only with a %s commit"), terms->term_bad);
+ if (!isatty(0))
+ return 0;
+ /*
+ * TRANSLATORS: Make sure to include [Y] and [n] in your
+ * translation. The program will only accept English input
+ * at this point.
+ */
+ yesno = git_prompt(_("Are you sure [Y/n]? "), PROMPT_ECHO);
+ if (starts_with(yesno, "N") || starts_with(yesno, "n"))
+ return -1;
+ return 0;
+ }
+
+ if (!is_empty_or_missing_file(git_path_bisect_start()))
+ return error(_(need_bad_and_good_revision_warning),
+ vocab_bad, vocab_good, vocab_bad, vocab_good);
+ else
+ return error(_(need_bisect_start_warning),
+ vocab_good, vocab_bad, vocab_good, vocab_bad);
+}
+
+static int bisect_next_check(const struct bisect_terms *terms,
+ const char *current_term)
+{
+ int missing_good = 1, missing_bad = 1;
+ char *bad_ref = xstrfmt("refs/bisect/%s", terms->term_bad);
+ char *good_glob = xstrfmt("%s-*", terms->term_good);
+
+ if (ref_exists(bad_ref))
+ missing_bad = 0;
+
+ for_each_glob_ref_in(mark_good, good_glob, "refs/bisect/",
+ (void *) &missing_good);
+
+ free(good_glob);
+ free(bad_ref);
+
+ return decide_next(terms, current_term, missing_good, missing_bad);
+}
+
+static int get_terms(struct bisect_terms *terms)
+{
+ struct strbuf str = STRBUF_INIT;
+ FILE *fp = NULL;
+ int res = 0;
+
+ fp = fopen(git_path_bisect_terms(), "r");
+ if (!fp) {
+ res = -1;
+ goto finish;
+ }
+
+ free_terms(terms);
+ strbuf_getline_lf(&str, fp);
+ terms->term_bad = strbuf_detach(&str, NULL);
+ strbuf_getline_lf(&str, fp);
+ terms->term_good = strbuf_detach(&str, NULL);
+
+finish:
+ if (fp)
+ fclose(fp);
+ strbuf_release(&str);
+ return res;
+}
+
+static int bisect_terms(struct bisect_terms *terms, const char *option)
+{
+ if (get_terms(terms))
+ return error(_("no terms defined"));
+
+ if (option == NULL) {
+ printf(_("Your current terms are %s for the old state\n"
+ "and %s for the new state.\n"),
+ terms->term_good, terms->term_bad);
+ return 0;
+ }
+ if (one_of(option, "--term-good", "--term-old", NULL))
+ printf("%s\n", terms->term_good);
+ else if (one_of(option, "--term-bad", "--term-new", NULL))
+ printf("%s\n", terms->term_bad);
+ else
+ return error(_("invalid argument %s for 'git bisect terms'.\n"
+ "Supported options are: "
+ "--term-good|--term-old and "
+ "--term-bad|--term-new."), option);
+
+ return 0;
+}
+
+static int bisect_append_log_quoted(const char **argv)
+{
+ int res = 0;
+ FILE *fp = fopen(git_path_bisect_log(), "a");
+ struct strbuf orig_args = STRBUF_INIT;
+
+ if (!fp)
+ return -1;
+
+ if (fprintf(fp, "git bisect start") < 1) {
+ res = -1;
+ goto finish;
+ }
+
+ sq_quote_argv(&orig_args, argv);
+ if (fprintf(fp, "%s\n", orig_args.buf) < 1)
+ res = -1;
+
+finish:
+ fclose(fp);
+ strbuf_release(&orig_args);
+ return res;
+}
+
+static int add_bisect_ref(const char *refname, const struct object_id *oid,
+ int flags, void *cb)
+{
+ struct add_bisect_ref_data *data = cb;
+
+ add_pending_oid(data->revs, refname, oid, data->object_flags);
+
+ return 0;
+}
+
+static int prepare_revs(struct bisect_terms *terms, struct rev_info *revs)
+{
+ int res = 0;
+ struct add_bisect_ref_data cb = { revs };
+ char *good = xstrfmt("%s-*", terms->term_good);
+
+ /*
+ * We cannot use terms->term_bad directly in
+ * for_each_glob_ref_in() and we have to append a '*' to it,
+ * otherwise for_each_glob_ref_in() will append '/' and '*'.
+ */
+ char *bad = xstrfmt("%s*", terms->term_bad);
+
+ /*
+ * It is important to reset the flags used by revision walks
+ * as the previous call to bisect_next_all() in turn
+ * sets up a revision walk.
+ */
+ reset_revision_walk();
+ init_revisions(revs, NULL);
+ setup_revisions(0, NULL, revs, NULL);
+ for_each_glob_ref_in(add_bisect_ref, bad, "refs/bisect/", &cb);
+ cb.object_flags = UNINTERESTING;
+ for_each_glob_ref_in(add_bisect_ref, good, "refs/bisect/", &cb);
+ if (prepare_revision_walk(revs))
+ res = error(_("revision walk setup failed\n"));
+
+ free(good);
+ free(bad);
+ return res;
+}
+
+static int bisect_skipped_commits(struct bisect_terms *terms)
+{
+ int res;
+ FILE *fp = NULL;
+ struct rev_info revs;
+ struct commit *commit;
+ struct pretty_print_context pp = {0};
+ struct strbuf commit_name = STRBUF_INIT;
+
+ res = prepare_revs(terms, &revs);
+ if (res)
+ return res;
+
+ fp = fopen(git_path_bisect_log(), "a");
+ if (!fp)
+ return error_errno(_("could not open '%s' for appending"),
+ git_path_bisect_log());
+
+ if (fprintf(fp, "# only skipped commits left to test\n") < 0)
+ return error_errno(_("failed to write to '%s'"), git_path_bisect_log());
+
+ while ((commit = get_revision(&revs)) != NULL) {
+ strbuf_reset(&commit_name);
+ format_commit_message(commit, "%s",
+ &commit_name, &pp);
+ fprintf(fp, "# possible first %s commit: [%s] %s\n",
+ terms->term_bad, oid_to_hex(&commit->object.oid),
+ commit_name.buf);
+ }
+
+ /*
+ * Reset the flags used by revision walks in case
+ * there is another revision walk after this one.
+ */
+ reset_revision_walk();
+
+ strbuf_release(&commit_name);
+ fclose(fp);
+ return 0;
+}
+
+static int bisect_successful(struct bisect_terms *terms)
+{
+ struct object_id oid;
+ struct commit *commit;
+ struct pretty_print_context pp = {0};
+ struct strbuf commit_name = STRBUF_INIT;
+ char *bad_ref = xstrfmt("refs/bisect/%s",terms->term_bad);
+ int res;
+
+ read_ref(bad_ref, &oid);
+ commit = lookup_commit_reference_by_name(bad_ref);
+ format_commit_message(commit, "%s", &commit_name, &pp);
+
+ res = append_to_file(git_path_bisect_log(), "# first %s commit: [%s] %s\n",
+ terms->term_bad, oid_to_hex(&commit->object.oid),
+ commit_name.buf);
+
+ strbuf_release(&commit_name);
+ free(bad_ref);
+ return res;
+}
+
+static enum bisect_error bisect_next(struct bisect_terms *terms, const char *prefix)
+{
+ enum bisect_error res;
+
+ if (bisect_autostart(terms))
+ return BISECT_FAILED;
+
+ if (bisect_next_check(terms, terms->term_good))
+ return BISECT_FAILED;
+
+ /* Perform all bisection computation */
+ res = bisect_next_all(the_repository, prefix);
+
+ if (res == BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND) {
+ res = bisect_successful(terms);
+ return res ? res : BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND;
+ } else if (res == BISECT_ONLY_SKIPPED_LEFT) {
+ res = bisect_skipped_commits(terms);
+ return res ? res : BISECT_ONLY_SKIPPED_LEFT;
+ }
+ return res;
+}
+
+static enum bisect_error bisect_auto_next(struct bisect_terms *terms, const char *prefix)
+{
+ if (bisect_next_check(terms, NULL))
+ return BISECT_OK;
+
+ return bisect_next(terms, prefix);
+}
+
+static enum bisect_error bisect_start(struct bisect_terms *terms, const char **argv, int argc)
+{
+ int no_checkout = 0;
+ int first_parent_only = 0;
+ int i, has_double_dash = 0, must_write_terms = 0, bad_seen = 0;
+ int flags, pathspec_pos;
+ enum bisect_error res = BISECT_OK;
+ struct string_list revs = STRING_LIST_INIT_DUP;
+ struct string_list states = STRING_LIST_INIT_DUP;
+ struct strbuf start_head = STRBUF_INIT;
+ struct strbuf bisect_names = STRBUF_INIT;
+ struct object_id head_oid;
+ struct object_id oid;
+ const char *head;
+
+ if (is_bare_repository())
+ no_checkout = 1;
+
+ /*
+ * Check for one bad and then some good revisions
+ */
+ for (i = 0; i < argc; i++) {
+ if (!strcmp(argv[i], "--")) {
+ has_double_dash = 1;
+ break;
+ }
+ }
+
+ for (i = 0; i < argc; i++) {
+ const char *arg = argv[i];
+ if (!strcmp(argv[i], "--")) {
+ break;
+ } else if (!strcmp(arg, "--no-checkout")) {
+ no_checkout = 1;
+ } else if (!strcmp(arg, "--first-parent")) {
+ first_parent_only = 1;
+ } else if (!strcmp(arg, "--term-good") ||
+ !strcmp(arg, "--term-old")) {
+ i++;
+ if (argc <= i)
+ return error(_("'' is not a valid term"));
+ must_write_terms = 1;
+ free((void *) terms->term_good);
+ terms->term_good = xstrdup(argv[i]);
+ } else if (skip_prefix(arg, "--term-good=", &arg) ||
+ skip_prefix(arg, "--term-old=", &arg)) {
+ must_write_terms = 1;
+ free((void *) terms->term_good);
+ terms->term_good = xstrdup(arg);
+ } else if (!strcmp(arg, "--term-bad") ||
+ !strcmp(arg, "--term-new")) {
+ i++;
+ if (argc <= i)
+ return error(_("'' is not a valid term"));
+ must_write_terms = 1;
+ free((void *) terms->term_bad);
+ terms->term_bad = xstrdup(argv[i]);
+ } else if (skip_prefix(arg, "--term-bad=", &arg) ||
+ skip_prefix(arg, "--term-new=", &arg)) {
+ must_write_terms = 1;
+ free((void *) terms->term_bad);
+ terms->term_bad = xstrdup(arg);
+ } else if (starts_with(arg, "--")) {
+ return error(_("unrecognized option: '%s'"), arg);
+ } else if (!get_oidf(&oid, "%s^{commit}", arg)) {
+ string_list_append(&revs, oid_to_hex(&oid));
+ } else if (has_double_dash) {
+ die(_("'%s' does not appear to be a valid "
+ "revision"), arg);
+ } else {
+ break;
+ }
+ }
+ pathspec_pos = i;
+
+ /*
+ * The user ran "git bisect start <sha1> <sha1>", hence did not
+ * explicitly specify the terms, but we are already starting to
+ * set references named with the default terms, and won't be able
+ * to change afterwards.
+ */
+ if (revs.nr)
+ must_write_terms = 1;
+ for (i = 0; i < revs.nr; i++) {
+ if (bad_seen) {
+ string_list_append(&states, terms->term_good);
+ } else {
+ bad_seen = 1;
+ string_list_append(&states, terms->term_bad);
+ }
+ }
+
+ /*
+ * Verify HEAD
+ */
+ head = resolve_ref_unsafe("HEAD", 0, &head_oid, &flags);
+ if (!head)
+ if (get_oid("HEAD", &head_oid))
+ return error(_("bad HEAD - I need a HEAD"));
+
+ /*
+ * Check if we are bisecting
+ */
+ if (!is_empty_or_missing_file(git_path_bisect_start())) {
+ /* Reset to the rev from where we started */
+ strbuf_read_file(&start_head, git_path_bisect_start(), 0);
+ strbuf_trim(&start_head);
+ if (!no_checkout) {
+ struct strvec argv = STRVEC_INIT;
+
+ strvec_pushl(&argv, "checkout", start_head.buf,
+ "--", NULL);
+ if (run_command_v_opt(argv.v, RUN_GIT_CMD)) {
+ res = error(_("checking out '%s' failed."
+ " Try 'git bisect start "
+ "<valid-branch>'."),
+ start_head.buf);
+ goto finish;
+ }
+ }
+ } else {
+ /* Get the rev from where we start. */
+ if (!get_oid(head, &head_oid) &&
+ !starts_with(head, "refs/heads/")) {
+ strbuf_reset(&start_head);
+ strbuf_addstr(&start_head, oid_to_hex(&head_oid));
+ } else if (!get_oid(head, &head_oid) &&
+ skip_prefix(head, "refs/heads/", &head)) {
+ /*
+ * This error message should only be triggered by
+ * cogito usage, and cogito users should understand
+ * it relates to cg-seek.
+ */
+ if (!is_empty_or_missing_file(git_path_head_name()))
+ return error(_("won't bisect on cg-seek'ed tree"));
+ strbuf_addstr(&start_head, head);
+ } else {
+ return error(_("bad HEAD - strange symbolic ref"));
+ }
+ }
+
+ /*
+ * Get rid of any old bisect state.
+ */
+ if (bisect_clean_state())
+ return BISECT_FAILED;
+
+ /*
+ * Write new start state
+ */
+ write_file(git_path_bisect_start(), "%s\n", start_head.buf);
+
+ if (first_parent_only)
+ write_file(git_path_bisect_first_parent(), "\n");
+
+ if (no_checkout) {
+ if (get_oid(start_head.buf, &oid) < 0) {
+ res = error(_("invalid ref: '%s'"), start_head.buf);
+ goto finish;
+ }
+ if (update_ref(NULL, "BISECT_HEAD", &oid, NULL, 0,
+ UPDATE_REFS_MSG_ON_ERR)) {
+ res = BISECT_FAILED;
+ goto finish;
+ }
+ }
+
+ if (pathspec_pos < argc - 1)
+ sq_quote_argv(&bisect_names, argv + pathspec_pos);
+ write_file(git_path_bisect_names(), "%s\n", bisect_names.buf);
+
+ for (i = 0; i < states.nr; i++)
+ if (bisect_write(states.items[i].string,
+ revs.items[i].string, terms, 1)) {
+ res = BISECT_FAILED;
+ goto finish;
+ }
+
+ if (must_write_terms && write_terms(terms->term_bad,
+ terms->term_good)) {
+ res = BISECT_FAILED;
+ goto finish;
+ }
+
+ res = bisect_append_log_quoted(argv);
+ if (res)
+ res = BISECT_FAILED;
+
+finish:
+ string_list_clear(&revs, 0);
+ string_list_clear(&states, 0);
+ strbuf_release(&start_head);
+ strbuf_release(&bisect_names);
+ if (res)
+ return res;
+
+ res = bisect_auto_next(terms, NULL);
+ if (!is_bisect_success(res))
+ bisect_clean_state();
+ return res;
+}
+
+static inline int file_is_not_empty(const char *path)
+{
+ return !is_empty_or_missing_file(path);
+}
+
+static int bisect_autostart(struct bisect_terms *terms)
+{
+ int res;
+ const char *yesno;
+
+ if (file_is_not_empty(git_path_bisect_start()))
+ return 0;
+
+ fprintf_ln(stderr, _("You need to start by \"git bisect "
+ "start\"\n"));
+
+ if (!isatty(STDIN_FILENO))
+ return -1;
+
+ /*
+ * TRANSLATORS: Make sure to include [Y] and [n] in your
+ * translation. The program will only accept English input
+ * at this point.
+ */
+ yesno = git_prompt(_("Do you want me to do it for you "
+ "[Y/n]? "), PROMPT_ECHO);
+ res = tolower(*yesno) == 'n' ?
+ -1 : bisect_start(terms, empty_strvec, 0);
+
+ return res;
+}
+
+static enum bisect_error bisect_state(struct bisect_terms *terms, const char **argv,
+ int argc)
+{
+ const char *state;
+ int i, verify_expected = 1;
+ struct object_id oid, expected;
+ struct strbuf buf = STRBUF_INIT;
+ struct oid_array revs = OID_ARRAY_INIT;
+
+ if (!argc)
+ return error(_("Please call `--bisect-state` with at least one argument"));
+
+ if (bisect_autostart(terms))
+ return BISECT_FAILED;
+
+ state = argv[0];
+ if (check_and_set_terms(terms, state) ||
+ !one_of(state, terms->term_good, terms->term_bad, "skip", NULL))
+ return BISECT_FAILED;
+
+ argv++;
+ argc--;
+ if (argc > 1 && !strcmp(state, terms->term_bad))
+ return error(_("'git bisect %s' can take only one argument."), terms->term_bad);
+
+ if (argc == 0) {
+ const char *head = "BISECT_HEAD";
+ enum get_oid_result res_head = get_oid(head, &oid);
+
+ if (res_head == MISSING_OBJECT) {
+ head = "HEAD";
+ res_head = get_oid(head, &oid);
+ }
+
+ if (res_head)
+ error(_("Bad rev input: %s"), head);
+ oid_array_append(&revs, &oid);
+ }
+
+ /*
+ * All input revs must be checked before executing bisect_write()
+ * to discard junk revs.
+ */
+
+ for (; argc; argc--, argv++) {
+ if (get_oid(*argv, &oid)){
+ error(_("Bad rev input: %s"), *argv);
+ oid_array_clear(&revs);
+ return BISECT_FAILED;
+ }
+ oid_array_append(&revs, &oid);
+ }
+
+ if (strbuf_read_file(&buf, git_path_bisect_expected_rev(), 0) < the_hash_algo->hexsz ||
+ get_oid_hex(buf.buf, &expected) < 0)
+ verify_expected = 0; /* Ignore invalid file contents */
+ strbuf_release(&buf);
+
+ for (i = 0; i < revs.nr; i++) {
+ if (bisect_write(state, oid_to_hex(&revs.oid[i]), terms, 0)) {
+ oid_array_clear(&revs);
+ return BISECT_FAILED;
+ }
+ if (verify_expected && !oideq(&revs.oid[i], &expected)) {
+ unlink_or_warn(git_path_bisect_ancestors_ok());
+ unlink_or_warn(git_path_bisect_expected_rev());
+ verify_expected = 0;
+ }
+ }
+
+ oid_array_clear(&revs);
+ return bisect_auto_next(terms, NULL);
+}
+
+int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
+{
+ enum {
+ BISECT_RESET = 1,
+ BISECT_WRITE,
+ CHECK_AND_SET_TERMS,
+ BISECT_NEXT_CHECK,
+ BISECT_TERMS,
+ BISECT_START,
+ BISECT_AUTOSTART,
+ BISECT_NEXT,
+ BISECT_AUTO_NEXT,
+ BISECT_STATE
+ } cmdmode = 0;
+ int res = 0, nolog = 0;
+ struct option options[] = {
+ OPT_CMDMODE(0, "bisect-reset", &cmdmode,
+ N_("reset the bisection state"), BISECT_RESET),
+ OPT_CMDMODE(0, "bisect-write", &cmdmode,
+ N_("write out the bisection state in BISECT_LOG"), BISECT_WRITE),
+ OPT_CMDMODE(0, "check-and-set-terms", &cmdmode,
+ N_("check and set terms in a bisection state"), CHECK_AND_SET_TERMS),
+ OPT_CMDMODE(0, "bisect-next-check", &cmdmode,
+ N_("check whether bad or good terms exist"), BISECT_NEXT_CHECK),
+ OPT_CMDMODE(0, "bisect-terms", &cmdmode,
+ N_("print out the bisect terms"), BISECT_TERMS),
+ OPT_CMDMODE(0, "bisect-start", &cmdmode,
+ N_("start the bisect session"), BISECT_START),
+ OPT_CMDMODE(0, "bisect-next", &cmdmode,
+ N_("find the next bisection commit"), BISECT_NEXT),
+ OPT_CMDMODE(0, "bisect-auto-next", &cmdmode,
+ N_("verify the next bisection state then checkout the next bisection commit"), BISECT_AUTO_NEXT),
+ OPT_CMDMODE(0, "bisect-state", &cmdmode,
+ N_("mark the state of ref (or refs)"), BISECT_STATE),
+ OPT_BOOL(0, "no-log", &nolog,
+ N_("no log for BISECT_WRITE")),
+ OPT_END()
+ };
+ struct bisect_terms terms = { .term_good = NULL, .term_bad = NULL };
+
+ argc = parse_options(argc, argv, prefix, options,
+ git_bisect_helper_usage,
+ PARSE_OPT_KEEP_DASHDASH | PARSE_OPT_KEEP_UNKNOWN);
+
+ if (!cmdmode)
+ usage_with_options(git_bisect_helper_usage, options);
+
+ switch (cmdmode) {
+ case BISECT_RESET:
+ if (argc > 1)
+ return error(_("--bisect-reset requires either no argument or a commit"));
+ return !!bisect_reset(argc ? argv[0] : NULL);
+ case BISECT_WRITE:
+ if (argc != 4 && argc != 5)
+ return error(_("--bisect-write requires either 4 or 5 arguments"));
+ set_terms(&terms, argv[3], argv[2]);
+ res = bisect_write(argv[0], argv[1], &terms, nolog);
+ break;
+ case CHECK_AND_SET_TERMS:
+ if (argc != 3)
+ return error(_("--check-and-set-terms requires 3 arguments"));
+ set_terms(&terms, argv[2], argv[1]);
+ res = check_and_set_terms(&terms, argv[0]);
+ break;
+ case BISECT_NEXT_CHECK:
+ if (argc != 2 && argc != 3)
+ return error(_("--bisect-next-check requires 2 or 3 arguments"));
+ set_terms(&terms, argv[1], argv[0]);
+ res = bisect_next_check(&terms, argc == 3 ? argv[2] : NULL);
+ break;
+ case BISECT_TERMS:
+ if (argc > 1)
+ return error(_("--bisect-terms requires 0 or 1 argument"));
+ res = bisect_terms(&terms, argc == 1 ? argv[0] : NULL);
+ break;
+ case BISECT_START:
+ set_terms(&terms, "bad", "good");
+ res = bisect_start(&terms, argv, argc);
+ break;
+ case BISECT_NEXT:
+ if (argc)
+ return error(_("--bisect-next requires 0 arguments"));
+ get_terms(&terms);
+ res = bisect_next(&terms, prefix);
+ break;
+ case BISECT_AUTO_NEXT:
+ if (argc)
+ return error(_("--bisect-auto-next requires 0 arguments"));
+ get_terms(&terms);
+ res = bisect_auto_next(&terms, prefix);
+ break;
+ case BISECT_STATE:
+ set_terms(&terms, "bad", "good");
+ get_terms(&terms);
+ res = bisect_state(&terms, argv, argc);
+ break;
+ default:
+ BUG("unknown subcommand %d", cmdmode);
+ }
+ free_terms(&terms);
+
+ /*
+ * Handle early success
+ * From check_merge_bases > check_good_are_ancestors_of_bad > bisect_next_all
+ */
+ if ((res == BISECT_INTERNAL_SUCCESS_MERGE_BASE) || (res == BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND))
+ res = BISECT_OK;
+
+ return -res;
+}