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#include "builtin.h"
#include "cache.h"
#include "parse-options.h"
#include "bisect.h"
#include "refs.h"
#include "dir.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_log, "BISECT_LOG")
static GIT_PATH_FUNC(git_path_bisect_names, "BISECT_NAMES")
static GIT_PATH_FUNC(git_path_bisect_run, "BISECT_RUN")
static GIT_PATH_FUNC(git_path_head_name, "head-name")
static GIT_PATH_FUNC(git_path_bisect_start, "BISECT_START")

static const char * const git_bisect_helper_usage[] = {
	N_("git bisect--helper --next-all [--no-checkout]"),
	N_("git bisect--helper --write-terms <bad_term> <good_term>"),
	N_("git bisect--helper --bisect-clean-state"),
	NULL
};

/*
 * Check whether the string `term` belongs to the set of strings
 * included in the variable arguments.
 */
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;
}

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", "replay", "log", "run", 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)
{
	FILE *fp;
	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;

	fp = fopen(git_path_bisect_terms(), "w");
	if (!fp)
		return error_errno(_("could not open the file BISECT_TERMS"));

	res = fprintf(fp, "%s\n%s\n", bad, good);
	fclose(fp);
	return (res < 0) ? -1 : 0;
}

static int mark_for_removal(const char *refname, const struct object_id *oid,
			    int flag, void *cb_data)
{
	struct string_list *refs = cb_data;
	char *ref = xstrfmt("refs/bisect/%s", refname);
	string_list_append(refs, ref);
	return 0;
}

static int bisect_clean_state(void)
{
	int result = 0;

	/* There may be some refs packed during bisection */
	struct string_list refs_for_removal = STRING_LIST_INIT_NODUP;
	for_each_ref_in("refs/bisect/", mark_for_removal, (void *) &refs_for_removal);
	string_list_append(&refs_for_removal, xstrdup("BISECT_HEAD"));
	result = delete_refs(&refs_for_removal);
	refs_for_removal.strdup_strings = 1;
	string_list_clear(&refs_for_removal, 0);
	remove_path(git_path_bisect_expected_rev());
	remove_path(git_path_bisect_ancestors_ok());
	remove_path(git_path_bisect_log());
	remove_path(git_path_bisect_names());
	remove_path(git_path_bisect_run());
	remove_path(git_path_bisect_terms());
	/* Cleanup head-name if it got left by an old version of git-bisect */
	remove_path(git_path_head_name());
	/*
	 * Cleanup BISECT_START last to support the --no-checkout option
	 * introduced in the commit 4796e823a.
	 */
	remove_path(git_path_bisect_start());

	return result;
}

int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
{
	enum {
		NEXT_ALL = 1,
		WRITE_TERMS,
		BISECT_CLEAN_STATE
	} cmdmode = 0;
	int no_checkout = 0;
	struct option options[] = {
		OPT_CMDMODE(0, "next-all", &cmdmode,
			 N_("perform 'git bisect next'"), NEXT_ALL),
		OPT_CMDMODE(0, "write-terms", &cmdmode,
			 N_("write the terms to .git/BISECT_TERMS"), WRITE_TERMS),
		OPT_CMDMODE(0, "bisect-clean-state", &cmdmode,
			 N_("cleanup the bisection state"), BISECT_CLEAN_STATE),
		OPT_BOOL(0, "no-checkout", &no_checkout,
			 N_("update BISECT_HEAD instead of checking out the current commit")),
		OPT_END()
	};

	argc = parse_options(argc, argv, prefix, options,
			     git_bisect_helper_usage, 0);

	if (!cmdmode)
		usage_with_options(git_bisect_helper_usage, options);

	switch (cmdmode) {
	case NEXT_ALL:
		return bisect_next_all(prefix, no_checkout);
	case WRITE_TERMS:
		if (argc != 2)
			die(_("--write-terms requires two arguments"));
		return write_terms(argv[0], argv[1]);
	case BISECT_CLEAN_STATE:
		if (argc != 0)
			die(_("--bisect-clean-state requires no arguments"));
		return bisect_clean_state();
	default:
		die("BUG: unknown subcommand '%d'", cmdmode);
	}
	return 0;
}
debug log:

solving ad67a97 ...
found ad67a97 in https://public-inbox.org/git/010201560a478269-d2b7864c-e177-43ed-87a8-05ccdff24367-000000@eu-west-1.amazonses.com/
found ef87c82 in https://public-inbox.org/git/010201560a478266-7d8dd795-2bb9-4dc9-95f3-97ca265834b1-000000@eu-west-1.amazonses.com/
found 48285d4 in https://public-inbox.org/git/0102015640423cc5-691952fa-3726-4132-bcc1-dfa55d4c0895-000000@eu-west-1.amazonses.com/ ||
	https://public-inbox.org/git/010201560a47824b-eac46132-eaa5-4ccc-a0ac-2121e74d5547-000000@eu-west-1.amazonses.com/
found 8111c91 in https://public-inbox.org/git/010201567675adc1-17e27495-6b36-40d1-836d-814da029fcc4-000000@eu-west-1.amazonses.com/ ||
	https://public-inbox.org/git/01020157c38b19e0-81123fa5-5d9d-4f64-8f1b-ff336e83ebe4-000000@eu-west-1.amazonses.com/ ||
	https://public-inbox.org/git/01020156b73fe5b4-5dc768ab-b73b-4a21-ab92-018e2a7aa6f7-000000@eu-west-1.amazonses.com/ ||
	https://public-inbox.org/git/01020156a48144f8-c0e127c1-8cd9-4295-ac16-449a54315cac-000000@eu-west-1.amazonses.com/ ||
	https://public-inbox.org/git/0102015640423c26-2060fd70-c90d-4de3-ae8c-1801ad160b1c-000000@eu-west-1.amazonses.com/ ||
	https://public-inbox.org/git/010201560a4781be-e8418d6a-5996-45cd-b11b-ca25894ad7f2-000000@eu-west-1.amazonses.com/ ||
	https://public-inbox.org/git/20160712223538.28508-2-pranit.bauva@gmail.com/ ||
	https://public-inbox.org/git/1464014928-31548-2-git-send-email-pranit.bauva@gmail.com/ ||
	https://public-inbox.org/git/20160524072124.2945-2-pranit.bauva@gmail.com/ ||
	https://public-inbox.org/git/1463031127-17718-2-git-send-email-pranit.bauva@gmail.com/ ||
	https://public-inbox.org/git/20160524184242.7518-2-pranit.bauva@gmail.com/
found 3324229 in git.git.git
preparing index
index prepared:
100644 3324229025300f7d7de600753c03af3ac22e2152	builtin/bisect--helper.c

applying [1/15] https://public-inbox.org/git/010201567675adc1-17e27495-6b36-40d1-836d-814da029fcc4-000000@eu-west-1.amazonses.com/
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index 3324229..8111c91 100644

Checking patch builtin/bisect--helper.c...
Applied patch builtin/bisect--helper.c cleanly.

skipping https://public-inbox.org/git/01020157c38b19e0-81123fa5-5d9d-4f64-8f1b-ff336e83ebe4-000000@eu-west-1.amazonses.com/ for 8111c91
skipping https://public-inbox.org/git/01020156b73fe5b4-5dc768ab-b73b-4a21-ab92-018e2a7aa6f7-000000@eu-west-1.amazonses.com/ for 8111c91
skipping https://public-inbox.org/git/01020156a48144f8-c0e127c1-8cd9-4295-ac16-449a54315cac-000000@eu-west-1.amazonses.com/ for 8111c91
skipping https://public-inbox.org/git/0102015640423c26-2060fd70-c90d-4de3-ae8c-1801ad160b1c-000000@eu-west-1.amazonses.com/ for 8111c91
skipping https://public-inbox.org/git/010201560a4781be-e8418d6a-5996-45cd-b11b-ca25894ad7f2-000000@eu-west-1.amazonses.com/ for 8111c91
skipping https://public-inbox.org/git/20160712223538.28508-2-pranit.bauva@gmail.com/ for 8111c91
skipping https://public-inbox.org/git/1464014928-31548-2-git-send-email-pranit.bauva@gmail.com/ for 8111c91
skipping https://public-inbox.org/git/20160524072124.2945-2-pranit.bauva@gmail.com/ for 8111c91
skipping https://public-inbox.org/git/1463031127-17718-2-git-send-email-pranit.bauva@gmail.com/ for 8111c91
skipping https://public-inbox.org/git/20160524184242.7518-2-pranit.bauva@gmail.com/ for 8111c91
index at:
100644 8111c9149f5b95234f7144b1310f3d2bd5f6310e	builtin/bisect--helper.c

applying [2/15] https://public-inbox.org/git/0102015640423cc5-691952fa-3726-4132-bcc1-dfa55d4c0895-000000@eu-west-1.amazonses.com/
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index 8111c91..48285d4 100644

Checking patch builtin/bisect--helper.c...
Applied patch builtin/bisect--helper.c cleanly.

skipping https://public-inbox.org/git/010201560a47824b-eac46132-eaa5-4ccc-a0ac-2121e74d5547-000000@eu-west-1.amazonses.com/ for 48285d4
index at:
100644 48285d4924ae3633f46873983338d356fce6a6b5	builtin/bisect--helper.c

applying [3/15] https://public-inbox.org/git/010201560a478266-7d8dd795-2bb9-4dc9-95f3-97ca265834b1-000000@eu-west-1.amazonses.com/
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index 48285d4..ef87c82 100644


applying [4/15] https://public-inbox.org/git/010201560a478269-d2b7864c-e177-43ed-87a8-05ccdff24367-000000@eu-west-1.amazonses.com/
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index ef87c82..ad67a97 100644

Checking patch builtin/bisect--helper.c...
Applied patch builtin/bisect--helper.c cleanly.
Checking patch builtin/bisect--helper.c...
Applied patch builtin/bisect--helper.c cleanly.

index at:
100644 ad67a97c43bcf73383e49a6f32b27a8732f0a117	builtin/bisect--helper.c

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