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-rw-r--r--third_party/git/builtin/rebase.c2105
1 files changed, 0 insertions, 2105 deletions
diff --git a/third_party/git/builtin/rebase.c b/third_party/git/builtin/rebase.c
deleted file mode 100644
index eeca53382f79..000000000000
--- a/third_party/git/builtin/rebase.c
+++ /dev/null
@@ -1,2105 +0,0 @@
-/*
- * "git rebase" builtin command
- *
- * Copyright (c) 2018 Pratik Karki
- */
-
-#define USE_THE_INDEX_COMPATIBILITY_MACROS
-#include "builtin.h"
-#include "run-command.h"
-#include "exec-cmd.h"
-#include "strvec.h"
-#include "dir.h"
-#include "packfile.h"
-#include "refs.h"
-#include "quote.h"
-#include "config.h"
-#include "cache-tree.h"
-#include "unpack-trees.h"
-#include "lockfile.h"
-#include "parse-options.h"
-#include "commit.h"
-#include "diff.h"
-#include "wt-status.h"
-#include "revision.h"
-#include "commit-reach.h"
-#include "rerere.h"
-#include "branch.h"
-#include "sequencer.h"
-#include "rebase-interactive.h"
-#include "reset.h"
-
-#define DEFAULT_REFLOG_ACTION "rebase"
-
-static char const * const builtin_rebase_usage[] = {
-	N_("git rebase [-i] [options] [--exec <cmd>] "
-		"[--onto <newbase> | --keep-base] [<upstream> [<branch>]]"),
-	N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
-		"--root [<branch>]"),
-	N_("git rebase --continue | --abort | --skip | --edit-todo"),
-	NULL
-};
-
-static GIT_PATH_FUNC(path_squash_onto, "rebase-merge/squash-onto")
-static GIT_PATH_FUNC(path_interactive, "rebase-merge/interactive")
-static GIT_PATH_FUNC(apply_dir, "rebase-apply")
-static GIT_PATH_FUNC(merge_dir, "rebase-merge")
-
-enum rebase_type {
-	REBASE_UNSPECIFIED = -1,
-	REBASE_APPLY,
-	REBASE_MERGE,
-	REBASE_PRESERVE_MERGES
-};
-
-enum empty_type {
-	EMPTY_UNSPECIFIED = -1,
-	EMPTY_DROP,
-	EMPTY_KEEP,
-	EMPTY_ASK
-};
-
-struct rebase_options {
-	enum rebase_type type;
-	enum empty_type empty;
-	const char *default_backend;
-	const char *state_dir;
-	struct commit *upstream;
-	const char *upstream_name;
-	const char *upstream_arg;
-	char *head_name;
-	struct object_id orig_head;
-	struct commit *onto;
-	const char *onto_name;
-	const char *revisions;
-	const char *switch_to;
-	int root, root_with_onto;
-	struct object_id *squash_onto;
-	struct commit *restrict_revision;
-	int dont_finish_rebase;
-	enum {
-		REBASE_NO_QUIET = 1<<0,
-		REBASE_VERBOSE = 1<<1,
-		REBASE_DIFFSTAT = 1<<2,
-		REBASE_FORCE = 1<<3,
-		REBASE_INTERACTIVE_EXPLICIT = 1<<4,
-	} flags;
-	struct strvec git_am_opts;
-	const char *action;
-	int signoff;
-	int allow_rerere_autoupdate;
-	int keep_empty;
-	int autosquash;
-	char *gpg_sign_opt;
-	int autostash;
-	int committer_date_is_author_date;
-	int ignore_date;
-	char *cmd;
-	int allow_empty_message;
-	int rebase_merges, rebase_cousins;
-	char *strategy, *strategy_opts;
-	struct strbuf git_format_patch_opt;
-	int reschedule_failed_exec;
-	int use_legacy_rebase;
-	int reapply_cherry_picks;
-};
-
-#define REBASE_OPTIONS_INIT {			  	\
-		.type = REBASE_UNSPECIFIED,	  	\
-		.empty = EMPTY_UNSPECIFIED,	  	\
-		.keep_empty = 1,			\
-		.default_backend = "merge",	  	\
-		.flags = REBASE_NO_QUIET, 		\
-		.git_am_opts = STRVEC_INIT,		\
-		.git_format_patch_opt = STRBUF_INIT	\
-	}
-
-static struct replay_opts get_replay_opts(const struct rebase_options *opts)
-{
-	struct replay_opts replay = REPLAY_OPTS_INIT;
-
-	replay.action = REPLAY_INTERACTIVE_REBASE;
-	sequencer_init_config(&replay);
-
-	replay.signoff = opts->signoff;
-	replay.allow_ff = !(opts->flags & REBASE_FORCE);
-	if (opts->allow_rerere_autoupdate)
-		replay.allow_rerere_auto = opts->allow_rerere_autoupdate;
-	replay.allow_empty = 1;
-	replay.allow_empty_message = opts->allow_empty_message;
-	replay.drop_redundant_commits = (opts->empty == EMPTY_DROP);
-	replay.keep_redundant_commits = (opts->empty == EMPTY_KEEP);
-	replay.quiet = !(opts->flags & REBASE_NO_QUIET);
-	replay.verbose = opts->flags & REBASE_VERBOSE;
-	replay.reschedule_failed_exec = opts->reschedule_failed_exec;
-	replay.committer_date_is_author_date =
-					opts->committer_date_is_author_date;
-	replay.ignore_date = opts->ignore_date;
-	replay.gpg_sign = xstrdup_or_null(opts->gpg_sign_opt);
-	replay.strategy = opts->strategy;
-
-	if (opts->strategy_opts)
-		parse_strategy_opts(&replay, opts->strategy_opts);
-
-	if (opts->squash_onto) {
-		oidcpy(&replay.squash_onto, opts->squash_onto);
-		replay.have_squash_onto = 1;
-	}
-
-	return replay;
-}
-
-enum action {
-	ACTION_NONE = 0,
-	ACTION_CONTINUE,
-	ACTION_SKIP,
-	ACTION_ABORT,
-	ACTION_QUIT,
-	ACTION_EDIT_TODO,
-	ACTION_SHOW_CURRENT_PATCH,
-	ACTION_SHORTEN_OIDS,
-	ACTION_EXPAND_OIDS,
-	ACTION_CHECK_TODO_LIST,
-	ACTION_REARRANGE_SQUASH,
-	ACTION_ADD_EXEC
-};
-
-static const char *action_names[] = { "undefined",
-				      "continue",
-				      "skip",
-				      "abort",
-				      "quit",
-				      "edit_todo",
-				      "show_current_patch" };
-
-static int add_exec_commands(struct string_list *commands)
-{
-	const char *todo_file = rebase_path_todo();
-	struct todo_list todo_list = TODO_LIST_INIT;
-	int res;
-
-	if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
-		return error_errno(_("could not read '%s'."), todo_file);
-
-	if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
-					&todo_list)) {
-		todo_list_release(&todo_list);
-		return error(_("unusable todo list: '%s'"), todo_file);
-	}
-
-	todo_list_add_exec_commands(&todo_list, commands);
-	res = todo_list_write_to_file(the_repository, &todo_list,
-				      todo_file, NULL, NULL, -1, 0);
-	todo_list_release(&todo_list);
-
-	if (res)
-		return error_errno(_("could not write '%s'."), todo_file);
-	return 0;
-}
-
-static int rearrange_squash_in_todo_file(void)
-{
-	const char *todo_file = rebase_path_todo();
-	struct todo_list todo_list = TODO_LIST_INIT;
-	int res = 0;
-
-	if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
-		return error_errno(_("could not read '%s'."), todo_file);
-	if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
-					&todo_list)) {
-		todo_list_release(&todo_list);
-		return error(_("unusable todo list: '%s'"), todo_file);
-	}
-
-	res = todo_list_rearrange_squash(&todo_list);
-	if (!res)
-		res = todo_list_write_to_file(the_repository, &todo_list,
-					      todo_file, NULL, NULL, -1, 0);
-
-	todo_list_release(&todo_list);
-
-	if (res)
-		return error_errno(_("could not write '%s'."), todo_file);
-	return 0;
-}
-
-static int transform_todo_file(unsigned flags)
-{
-	const char *todo_file = rebase_path_todo();
-	struct todo_list todo_list = TODO_LIST_INIT;
-	int res;
-
-	if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
-		return error_errno(_("could not read '%s'."), todo_file);
-
-	if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
-					&todo_list)) {
-		todo_list_release(&todo_list);
-		return error(_("unusable todo list: '%s'"), todo_file);
-	}
-
-	res = todo_list_write_to_file(the_repository, &todo_list, todo_file,
-				      NULL, NULL, -1, flags);
-	todo_list_release(&todo_list);
-
-	if (res)
-		return error_errno(_("could not write '%s'."), todo_file);
-	return 0;
-}
-
-static int edit_todo_file(unsigned flags)
-{
-	const char *todo_file = rebase_path_todo();
-	struct todo_list todo_list = TODO_LIST_INIT,
-		new_todo = TODO_LIST_INIT;
-	int res = 0;
-
-	if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
-		return error_errno(_("could not read '%s'."), todo_file);
-
-	strbuf_stripspace(&todo_list.buf, 1);
-	res = edit_todo_list(the_repository, &todo_list, &new_todo, NULL, NULL, flags);
-	if (!res && todo_list_write_to_file(the_repository, &new_todo, todo_file,
-					    NULL, NULL, -1, flags & ~(TODO_LIST_SHORTEN_IDS)))
-		res = error_errno(_("could not write '%s'"), todo_file);
-
-	todo_list_release(&todo_list);
-	todo_list_release(&new_todo);
-
-	return res;
-}
-
-static int get_revision_ranges(struct commit *upstream, struct commit *onto,
-			       struct object_id *orig_head, const char **head_hash,
-			       char **revisions, char **shortrevisions)
-{
-	struct commit *base_rev = upstream ? upstream : onto;
-	const char *shorthead;
-
-	*head_hash = find_unique_abbrev(orig_head, GIT_MAX_HEXSZ);
-	*revisions = xstrfmt("%s...%s", oid_to_hex(&base_rev->object.oid),
-						   *head_hash);
-
-	shorthead = find_unique_abbrev(orig_head, DEFAULT_ABBREV);
-
-	if (upstream) {
-		const char *shortrev;
-
-		shortrev = find_unique_abbrev(&base_rev->object.oid,
-					      DEFAULT_ABBREV);
-
-		*shortrevisions = xstrfmt("%s..%s", shortrev, shorthead);
-	} else
-		*shortrevisions = xstrdup(shorthead);
-
-	return 0;
-}
-
-static int init_basic_state(struct replay_opts *opts, const char *head_name,
-			    struct commit *onto, const char *orig_head)
-{
-	FILE *interactive;
-
-	if (!is_directory(merge_dir()) && mkdir_in_gitdir(merge_dir()))
-		return error_errno(_("could not create temporary %s"), merge_dir());
-
-	delete_reflog("REBASE_HEAD");
-
-	interactive = fopen(path_interactive(), "w");
-	if (!interactive)
-		return error_errno(_("could not mark as interactive"));
-	fclose(interactive);
-
-	return write_basic_state(opts, head_name, onto, orig_head);
-}
-
-static void split_exec_commands(const char *cmd, struct string_list *commands)
-{
-	if (cmd && *cmd) {
-		string_list_split(commands, cmd, '\n', -1);
-
-		/* rebase.c adds a new line to cmd after every command,
-		 * so here the last command is always empty */
-		string_list_remove_empty_items(commands, 0);
-	}
-}
-
-static int do_interactive_rebase(struct rebase_options *opts, unsigned flags)
-{
-	int ret;
-	const char *head_hash = NULL;
-	char *revisions = NULL, *shortrevisions = NULL;
-	struct strvec make_script_args = STRVEC_INIT;
-	struct todo_list todo_list = TODO_LIST_INIT;
-	struct replay_opts replay = get_replay_opts(opts);
-	struct string_list commands = STRING_LIST_INIT_DUP;
-
-	if (get_revision_ranges(opts->upstream, opts->onto, &opts->orig_head,
-				&head_hash, &revisions, &shortrevisions))
-		return -1;
-
-	if (init_basic_state(&replay,
-			     opts->head_name ? opts->head_name : "detached HEAD",
-			     opts->onto, head_hash)) {
-		free(revisions);
-		free(shortrevisions);
-
-		return -1;
-	}
-
-	if (!opts->upstream && opts->squash_onto)
-		write_file(path_squash_onto(), "%s\n",
-			   oid_to_hex(opts->squash_onto));
-
-	strvec_pushl(&make_script_args, "", revisions, NULL);
-	if (opts->restrict_revision)
-		strvec_pushf(&make_script_args, "^%s",
-			     oid_to_hex(&opts->restrict_revision->object.oid));
-
-	ret = sequencer_make_script(the_repository, &todo_list.buf,
-				    make_script_args.nr, make_script_args.v,
-				    flags);
-
-	if (ret)
-		error(_("could not generate todo list"));
-	else {
-		discard_cache();
-		if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
-						&todo_list))
-			BUG("unusable todo list");
-
-		split_exec_commands(opts->cmd, &commands);
-		ret = complete_action(the_repository, &replay, flags,
-			shortrevisions, opts->onto_name, opts->onto, head_hash,
-			&commands, opts->autosquash, &todo_list);
-	}
-
-	string_list_clear(&commands, 0);
-	free(revisions);
-	free(shortrevisions);
-	todo_list_release(&todo_list);
-	strvec_clear(&make_script_args);
-
-	return ret;
-}
-
-static int run_sequencer_rebase(struct rebase_options *opts,
-				  enum action command)
-{
-	unsigned flags = 0;
-	int abbreviate_commands = 0, ret = 0;
-
-	git_config_get_bool("rebase.abbreviatecommands", &abbreviate_commands);
-
-	flags |= opts->keep_empty ? TODO_LIST_KEEP_EMPTY : 0;
-	flags |= abbreviate_commands ? TODO_LIST_ABBREVIATE_CMDS : 0;
-	flags |= opts->rebase_merges ? TODO_LIST_REBASE_MERGES : 0;
-	flags |= opts->rebase_cousins > 0 ? TODO_LIST_REBASE_COUSINS : 0;
-	flags |= opts->root_with_onto ? TODO_LIST_ROOT_WITH_ONTO : 0;
-	flags |= command == ACTION_SHORTEN_OIDS ? TODO_LIST_SHORTEN_IDS : 0;
-	flags |= opts->reapply_cherry_picks ? TODO_LIST_REAPPLY_CHERRY_PICKS : 0;
-
-	switch (command) {
-	case ACTION_NONE: {
-		if (!opts->onto && !opts->upstream)
-			die(_("a base commit must be provided with --upstream or --onto"));
-
-		ret = do_interactive_rebase(opts, flags);
-		break;
-	}
-	case ACTION_SKIP: {
-		struct string_list merge_rr = STRING_LIST_INIT_DUP;
-
-		rerere_clear(the_repository, &merge_rr);
-	}
-		/* fallthrough */
-	case ACTION_CONTINUE: {
-		struct replay_opts replay_opts = get_replay_opts(opts);
-
-		ret = sequencer_continue(the_repository, &replay_opts);
-		break;
-	}
-	case ACTION_EDIT_TODO:
-		ret = edit_todo_file(flags);
-		break;
-	case ACTION_SHOW_CURRENT_PATCH: {
-		struct child_process cmd = CHILD_PROCESS_INIT;
-
-		cmd.git_cmd = 1;
-		strvec_pushl(&cmd.args, "show", "REBASE_HEAD", "--", NULL);
-		ret = run_command(&cmd);
-
-		break;
-	}
-	case ACTION_SHORTEN_OIDS:
-	case ACTION_EXPAND_OIDS:
-		ret = transform_todo_file(flags);
-		break;
-	case ACTION_CHECK_TODO_LIST:
-		ret = check_todo_list_from_file(the_repository);
-		break;
-	case ACTION_REARRANGE_SQUASH:
-		ret = rearrange_squash_in_todo_file();
-		break;
-	case ACTION_ADD_EXEC: {
-		struct string_list commands = STRING_LIST_INIT_DUP;
-
-		split_exec_commands(opts->cmd, &commands);
-		ret = add_exec_commands(&commands);
-		string_list_clear(&commands, 0);
-		break;
-	}
-	default:
-		BUG("invalid command '%d'", command);
-	}
-
-	return ret;
-}
-
-static void imply_merge(struct rebase_options *opts, const char *option);
-static int parse_opt_keep_empty(const struct option *opt, const char *arg,
-				int unset)
-{
-	struct rebase_options *opts = opt->value;
-
-	BUG_ON_OPT_ARG(arg);
-
-	imply_merge(opts, unset ? "--no-keep-empty" : "--keep-empty");
-	opts->keep_empty = !unset;
-	opts->type = REBASE_MERGE;
-	return 0;
-}
-
-static const char * const builtin_rebase_interactive_usage[] = {
-	N_("git rebase--interactive [<options>]"),
-	NULL
-};
-
-int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
-{
-	struct rebase_options opts = REBASE_OPTIONS_INIT;
-	struct object_id squash_onto = null_oid;
-	enum action command = ACTION_NONE;
-	struct option options[] = {
-		OPT_NEGBIT(0, "ff", &opts.flags, N_("allow fast-forward"),
-			   REBASE_FORCE),
-		OPT_CALLBACK_F('k', "keep-empty", &options, NULL,
-			N_("keep commits which start empty"),
-			PARSE_OPT_NOARG | PARSE_OPT_HIDDEN,
-			parse_opt_keep_empty),
-		OPT_BOOL_F(0, "allow-empty-message", &opts.allow_empty_message,
-			   N_("allow commits with empty messages"),
-			   PARSE_OPT_HIDDEN),
-		OPT_BOOL(0, "rebase-merges", &opts.rebase_merges, N_("rebase merge commits")),
-		OPT_BOOL(0, "rebase-cousins", &opts.rebase_cousins,
-			 N_("keep original branch points of cousins")),
-		OPT_BOOL(0, "autosquash", &opts.autosquash,
-			 N_("move commits that begin with squash!/fixup!")),
-		OPT_BOOL(0, "signoff", &opts.signoff, N_("sign commits")),
-		OPT_BIT('v', "verbose", &opts.flags,
-			N_("display a diffstat of what changed upstream"),
-			REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
-		OPT_CMDMODE(0, "continue", &command, N_("continue rebase"),
-			    ACTION_CONTINUE),
-		OPT_CMDMODE(0, "skip", &command, N_("skip commit"), ACTION_SKIP),
-		OPT_CMDMODE(0, "edit-todo", &command, N_("edit the todo list"),
-			    ACTION_EDIT_TODO),
-		OPT_CMDMODE(0, "show-current-patch", &command, N_("show the current patch"),
-			    ACTION_SHOW_CURRENT_PATCH),
-		OPT_CMDMODE(0, "shorten-ids", &command,
-			N_("shorten commit ids in the todo list"), ACTION_SHORTEN_OIDS),
-		OPT_CMDMODE(0, "expand-ids", &command,
-			N_("expand commit ids in the todo list"), ACTION_EXPAND_OIDS),
-		OPT_CMDMODE(0, "check-todo-list", &command,
-			N_("check the todo list"), ACTION_CHECK_TODO_LIST),
-		OPT_CMDMODE(0, "rearrange-squash", &command,
-			N_("rearrange fixup/squash lines"), ACTION_REARRANGE_SQUASH),
-		OPT_CMDMODE(0, "add-exec-commands", &command,
-			N_("insert exec commands in todo list"), ACTION_ADD_EXEC),
-		{ OPTION_CALLBACK, 0, "onto", &opts.onto, N_("onto"), N_("onto"),
-		  PARSE_OPT_NONEG, parse_opt_commit, 0 },
-		{ OPTION_CALLBACK, 0, "restrict-revision", &opts.restrict_revision,
-		  N_("restrict-revision"), N_("restrict revision"),
-		  PARSE_OPT_NONEG, parse_opt_commit, 0 },
-		{ OPTION_CALLBACK, 0, "squash-onto", &squash_onto, N_("squash-onto"),
-		  N_("squash onto"), PARSE_OPT_NONEG, parse_opt_object_id, 0 },
-		{ OPTION_CALLBACK, 0, "upstream", &opts.upstream, N_("upstream"),
-		  N_("the upstream commit"), PARSE_OPT_NONEG, parse_opt_commit,
-		  0 },
-		OPT_STRING(0, "head-name", &opts.head_name, N_("head-name"), N_("head name")),
-		{ OPTION_STRING, 'S', "gpg-sign", &opts.gpg_sign_opt, N_("key-id"),
-			N_("GPG-sign commits"),
-			PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
-		OPT_STRING(0, "strategy", &opts.strategy, N_("strategy"),
-			   N_("rebase strategy")),
-		OPT_STRING(0, "strategy-opts", &opts.strategy_opts, N_("strategy-opts"),
-			   N_("strategy options")),
-		OPT_STRING(0, "switch-to", &opts.switch_to, N_("switch-to"),
-			   N_("the branch or commit to checkout")),
-		OPT_STRING(0, "onto-name", &opts.onto_name, N_("onto-name"), N_("onto name")),
-		OPT_STRING(0, "cmd", &opts.cmd, N_("cmd"), N_("the command to run")),
-		OPT_RERERE_AUTOUPDATE(&opts.allow_rerere_autoupdate),
-		OPT_BOOL(0, "reschedule-failed-exec", &opts.reschedule_failed_exec,
-			 N_("automatically re-schedule any `exec` that fails")),
-		OPT_END()
-	};
-
-	opts.rebase_cousins = -1;
-
-	if (argc == 1)
-		usage_with_options(builtin_rebase_interactive_usage, options);
-
-	argc = parse_options(argc, argv, prefix, options,
-			builtin_rebase_interactive_usage, PARSE_OPT_KEEP_ARGV0);
-
-	if (!is_null_oid(&squash_onto))
-		opts.squash_onto = &squash_onto;
-
-	if (opts.rebase_cousins >= 0 && !opts.rebase_merges)
-		warning(_("--[no-]rebase-cousins has no effect without "
-			  "--rebase-merges"));
-
-	return !!run_sequencer_rebase(&opts, command);
-}
-
-static int is_merge(struct rebase_options *opts)
-{
-	return opts->type == REBASE_MERGE ||
-		opts->type == REBASE_PRESERVE_MERGES;
-}
-
-static void imply_merge(struct rebase_options *opts, const char *option)
-{
-	switch (opts->type) {
-	case REBASE_APPLY:
-		die(_("%s requires the merge backend"), option);
-		break;
-	case REBASE_MERGE:
-	case REBASE_PRESERVE_MERGES:
-		break;
-	default:
-		opts->type = REBASE_MERGE; /* implied */
-		break;
-	}
-}
-
-/* Returns the filename prefixed by the state_dir */
-static const char *state_dir_path(const char *filename, struct rebase_options *opts)
-{
-	static struct strbuf path = STRBUF_INIT;
-	static size_t prefix_len;
-
-	if (!prefix_len) {
-		strbuf_addf(&path, "%s/", opts->state_dir);
-		prefix_len = path.len;
-	}
-
-	strbuf_setlen(&path, prefix_len);
-	strbuf_addstr(&path, filename);
-	return path.buf;
-}
-
-/* Initialize the rebase options from the state directory. */
-static int read_basic_state(struct rebase_options *opts)
-{
-	struct strbuf head_name = STRBUF_INIT;
-	struct strbuf buf = STRBUF_INIT;
-	struct object_id oid;
-
-	if (!read_oneliner(&head_name, state_dir_path("head-name", opts),
-			   READ_ONELINER_WARN_MISSING) ||
-	    !read_oneliner(&buf, state_dir_path("onto", opts),
-			   READ_ONELINER_WARN_MISSING))
-		return -1;
-	opts->head_name = starts_with(head_name.buf, "refs/") ?
-		xstrdup(head_name.buf) : NULL;
-	strbuf_release(&head_name);
-	if (get_oid(buf.buf, &oid))
-		return error(_("could not get 'onto': '%s'"), buf.buf);
-	opts->onto = lookup_commit_or_die(&oid, buf.buf);
-
-	/*
-	 * We always write to orig-head, but interactive rebase used to write to
-	 * head. Fall back to reading from head to cover for the case that the
-	 * user upgraded git with an ongoing interactive rebase.
-	 */
-	strbuf_reset(&buf);
-	if (file_exists(state_dir_path("orig-head", opts))) {
-		if (!read_oneliner(&buf, state_dir_path("orig-head", opts),
-				   READ_ONELINER_WARN_MISSING))
-			return -1;
-	} else if (!read_oneliner(&buf, state_dir_path("head", opts),
-				  READ_ONELINER_WARN_MISSING))
-		return -1;
-	if (get_oid(buf.buf, &opts->orig_head))
-		return error(_("invalid orig-head: '%s'"), buf.buf);
-
-	if (file_exists(state_dir_path("quiet", opts)))
-		opts->flags &= ~REBASE_NO_QUIET;
-	else
-		opts->flags |= REBASE_NO_QUIET;
-
-	if (file_exists(state_dir_path("verbose", opts)))
-		opts->flags |= REBASE_VERBOSE;
-
-	if (file_exists(state_dir_path("signoff", opts))) {
-		opts->signoff = 1;
-		opts->flags |= REBASE_FORCE;
-	}
-
-	if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) {
-		strbuf_reset(&buf);
-		if (!read_oneliner(&buf, state_dir_path("allow_rerere_autoupdate", opts),
-				   READ_ONELINER_WARN_MISSING))
-			return -1;
-		if (!strcmp(buf.buf, "--rerere-autoupdate"))
-			opts->allow_rerere_autoupdate = RERERE_AUTOUPDATE;
-		else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
-			opts->allow_rerere_autoupdate = RERERE_NOAUTOUPDATE;
-		else
-			warning(_("ignoring invalid allow_rerere_autoupdate: "
-				  "'%s'"), buf.buf);
-	}
-
-	if (file_exists(state_dir_path("gpg_sign_opt", opts))) {
-		strbuf_reset(&buf);
-		if (!read_oneliner(&buf, state_dir_path("gpg_sign_opt", opts),
-				   READ_ONELINER_WARN_MISSING))
-			return -1;
-		free(opts->gpg_sign_opt);
-		opts->gpg_sign_opt = xstrdup(buf.buf);
-	}
-
-	if (file_exists(state_dir_path("strategy", opts))) {
-		strbuf_reset(&buf);
-		if (!read_oneliner(&buf, state_dir_path("strategy", opts),
-				   READ_ONELINER_WARN_MISSING))
-			return -1;
-		free(opts->strategy);
-		opts->strategy = xstrdup(buf.buf);
-	}
-
-	if (file_exists(state_dir_path("strategy_opts", opts))) {
-		strbuf_reset(&buf);
-		if (!read_oneliner(&buf, state_dir_path("strategy_opts", opts),
-				   READ_ONELINER_WARN_MISSING))
-			return -1;
-		free(opts->strategy_opts);
-		opts->strategy_opts = xstrdup(buf.buf);
-	}
-
-	strbuf_release(&buf);
-
-	return 0;
-}
-
-static int rebase_write_basic_state(struct rebase_options *opts)
-{
-	write_file(state_dir_path("head-name", opts), "%s",
-		   opts->head_name ? opts->head_name : "detached HEAD");
-	write_file(state_dir_path("onto", opts), "%s",
-		   opts->onto ? oid_to_hex(&opts->onto->object.oid) : "");
-	write_file(state_dir_path("orig-head", opts), "%s",
-		   oid_to_hex(&opts->orig_head));
-	if (!(opts->flags & REBASE_NO_QUIET))
-		write_file(state_dir_path("quiet", opts), "%s", "");
-	if (opts->flags & REBASE_VERBOSE)
-		write_file(state_dir_path("verbose", opts), "%s", "");
-	if (opts->strategy)
-		write_file(state_dir_path("strategy", opts), "%s",
-			   opts->strategy);
-	if (opts->strategy_opts)
-		write_file(state_dir_path("strategy_opts", opts), "%s",
-			   opts->strategy_opts);
-	if (opts->allow_rerere_autoupdate > 0)
-		write_file(state_dir_path("allow_rerere_autoupdate", opts),
-			   "-%s-rerere-autoupdate",
-			   opts->allow_rerere_autoupdate == RERERE_AUTOUPDATE ?
-				"" : "-no");
-	if (opts->gpg_sign_opt)
-		write_file(state_dir_path("gpg_sign_opt", opts), "%s",
-			   opts->gpg_sign_opt);
-	if (opts->signoff)
-		write_file(state_dir_path("signoff", opts), "--signoff");
-
-	return 0;
-}
-
-static int finish_rebase(struct rebase_options *opts)
-{
-	struct strbuf dir = STRBUF_INIT;
-	int ret = 0;
-
-	delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
-	apply_autostash(state_dir_path("autostash", opts));
-	close_object_store(the_repository->objects);
-	/*
-	 * We ignore errors in 'git maintenance run --auto', since the
-	 * user should see them.
-	 */
-	run_auto_maintenance(!(opts->flags & (REBASE_NO_QUIET|REBASE_VERBOSE)));
-	if (opts->type == REBASE_MERGE) {
-		struct replay_opts replay = REPLAY_OPTS_INIT;
-
-		replay.action = REPLAY_INTERACTIVE_REBASE;
-		ret = sequencer_remove_state(&replay);
-	} else {
-		strbuf_addstr(&dir, opts->state_dir);
-		if (remove_dir_recursively(&dir, 0))
-			ret = error(_("could not remove '%s'"),
-				    opts->state_dir);
-		strbuf_release(&dir);
-	}
-
-	return ret;
-}
-
-static struct commit *peel_committish(const char *name)
-{
-	struct object *obj;
-	struct object_id oid;
-
-	if (get_oid(name, &oid))
-		return NULL;
-	obj = parse_object(the_repository, &oid);
-	return (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
-}
-
-static void add_var(struct strbuf *buf, const char *name, const char *value)
-{
-	if (!value)
-		strbuf_addf(buf, "unset %s; ", name);
-	else {
-		strbuf_addf(buf, "%s=", name);
-		sq_quote_buf(buf, value);
-		strbuf_addstr(buf, "; ");
-	}
-}
-
-static int move_to_original_branch(struct rebase_options *opts)
-{
-	struct strbuf orig_head_reflog = STRBUF_INIT, head_reflog = STRBUF_INIT;
-	int ret;
-
-	if (!opts->head_name)
-		return 0; /* nothing to move back to */
-
-	if (!opts->onto)
-		BUG("move_to_original_branch without onto");
-
-	strbuf_addf(&orig_head_reflog, "rebase finished: %s onto %s",
-		    opts->head_name, oid_to_hex(&opts->onto->object.oid));
-	strbuf_addf(&head_reflog, "rebase finished: returning to %s",
-		    opts->head_name);
-	ret = reset_head(the_repository, NULL, "", opts->head_name,
-			 RESET_HEAD_REFS_ONLY,
-			 orig_head_reflog.buf, head_reflog.buf,
-			 DEFAULT_REFLOG_ACTION);
-
-	strbuf_release(&orig_head_reflog);
-	strbuf_release(&head_reflog);
-	return ret;
-}
-
-static const char *resolvemsg =
-N_("Resolve all conflicts manually, mark them as resolved with\n"
-"\"git add/rm <conflicted_files>\", then run \"git rebase --continue\".\n"
-"You can instead skip this commit: run \"git rebase --skip\".\n"
-"To abort and get back to the state before \"git rebase\", run "
-"\"git rebase --abort\".");
-
-static int run_am(struct rebase_options *opts)
-{
-	struct child_process am = CHILD_PROCESS_INIT;
-	struct child_process format_patch = CHILD_PROCESS_INIT;
-	struct strbuf revisions = STRBUF_INIT;
-	int status;
-	char *rebased_patches;
-
-	am.git_cmd = 1;
-	strvec_push(&am.args, "am");
-
-	if (opts->action && !strcmp("continue", opts->action)) {
-		strvec_push(&am.args, "--resolved");
-		strvec_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
-		if (opts->gpg_sign_opt)
-			strvec_push(&am.args, opts->gpg_sign_opt);
-		status = run_command(&am);
-		if (status)
-			return status;
-
-		return move_to_original_branch(opts);
-	}
-	if (opts->action && !strcmp("skip", opts->action)) {
-		strvec_push(&am.args, "--skip");
-		strvec_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
-		status = run_command(&am);
-		if (status)
-			return status;
-
-		return move_to_original_branch(opts);
-	}
-	if (opts->action && !strcmp("show-current-patch", opts->action)) {
-		strvec_push(&am.args, "--show-current-patch");
-		return run_command(&am);
-	}
-
-	strbuf_addf(&revisions, "%s...%s",
-		    oid_to_hex(opts->root ?
-			       /* this is now equivalent to !opts->upstream */
-			       &opts->onto->object.oid :
-			       &opts->upstream->object.oid),
-		    oid_to_hex(&opts->orig_head));
-
-	rebased_patches = xstrdup(git_path("rebased-patches"));
-	format_patch.out = open(rebased_patches,
-				O_WRONLY | O_CREAT | O_TRUNC, 0666);
-	if (format_patch.out < 0) {
-		status = error_errno(_("could not open '%s' for writing"),
-				     rebased_patches);
-		free(rebased_patches);
-		strvec_clear(&am.args);
-		return status;
-	}
-
-	format_patch.git_cmd = 1;
-	strvec_pushl(&format_patch.args, "format-patch", "-k", "--stdout",
-		     "--full-index", "--cherry-pick", "--right-only",
-		     "--src-prefix=a/", "--dst-prefix=b/", "--no-renames",
-		     "--no-cover-letter", "--pretty=mboxrd", "--topo-order",
-		     "--no-base", NULL);
-	if (opts->git_format_patch_opt.len)
-		strvec_split(&format_patch.args,
-			     opts->git_format_patch_opt.buf);
-	strvec_push(&format_patch.args, revisions.buf);
-	if (opts->restrict_revision)
-		strvec_pushf(&format_patch.args, "^%s",
-			     oid_to_hex(&opts->restrict_revision->object.oid));
-
-	status = run_command(&format_patch);
-	if (status) {
-		unlink(rebased_patches);
-		free(rebased_patches);
-		strvec_clear(&am.args);
-
-		reset_head(the_repository, &opts->orig_head, "checkout",
-			   opts->head_name, 0,
-			   "HEAD", NULL, DEFAULT_REFLOG_ACTION);
-		error(_("\ngit encountered an error while preparing the "
-			"patches to replay\n"
-			"these revisions:\n"
-			"\n    %s\n\n"
-			"As a result, git cannot rebase them."),
-		      opts->revisions);
-
-		strbuf_release(&revisions);
-		return status;
-	}
-	strbuf_release(&revisions);
-
-	am.in = open(rebased_patches, O_RDONLY);
-	if (am.in < 0) {
-		status = error_errno(_("could not open '%s' for reading"),
-				     rebased_patches);
-		free(rebased_patches);
-		strvec_clear(&am.args);
-		return status;
-	}
-
-	strvec_pushv(&am.args, opts->git_am_opts.v);
-	strvec_push(&am.args, "--rebasing");
-	strvec_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
-	strvec_push(&am.args, "--patch-format=mboxrd");
-	if (opts->allow_rerere_autoupdate == RERERE_AUTOUPDATE)
-		strvec_push(&am.args, "--rerere-autoupdate");
-	else if (opts->allow_rerere_autoupdate == RERERE_NOAUTOUPDATE)
-		strvec_push(&am.args, "--no-rerere-autoupdate");
-	if (opts->gpg_sign_opt)
-		strvec_push(&am.args, opts->gpg_sign_opt);
-	status = run_command(&am);
-	unlink(rebased_patches);
-	free(rebased_patches);
-
-	if (!status) {
-		return move_to_original_branch(opts);
-	}
-
-	if (is_directory(opts->state_dir))
-		rebase_write_basic_state(opts);
-
-	return status;
-}
-
-static int run_specific_rebase(struct rebase_options *opts, enum action action)
-{
-	const char *argv[] = { NULL, NULL };
-	struct strbuf script_snippet = STRBUF_INIT, buf = STRBUF_INIT;
-	int status;
-	const char *backend, *backend_func;
-
-	if (opts->type == REBASE_MERGE) {
-		/* Run sequencer-based rebase */
-		setenv("GIT_CHERRY_PICK_HELP", resolvemsg, 1);
-		if (!(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
-			setenv("GIT_SEQUENCE_EDITOR", ":", 1);
-			opts->autosquash = 0;
-		}
-		if (opts->gpg_sign_opt) {
-			/* remove the leading "-S" */
-			char *tmp = xstrdup(opts->gpg_sign_opt + 2);
-			free(opts->gpg_sign_opt);
-			opts->gpg_sign_opt = tmp;
-		}
-
-		status = run_sequencer_rebase(opts, action);
-		goto finished_rebase;
-	}
-
-	if (opts->type == REBASE_APPLY) {
-		status = run_am(opts);
-		goto finished_rebase;
-	}
-
-	add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir()));
-	add_var(&script_snippet, "state_dir", opts->state_dir);
-
-	add_var(&script_snippet, "upstream_name", opts->upstream_name);
-	add_var(&script_snippet, "upstream", opts->upstream ?
-		oid_to_hex(&opts->upstream->object.oid) : NULL);
-	add_var(&script_snippet, "head_name",
-		opts->head_name ? opts->head_name : "detached HEAD");
-	add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
-	add_var(&script_snippet, "onto", opts->onto ?
-		oid_to_hex(&opts->onto->object.oid) : NULL);
-	add_var(&script_snippet, "onto_name", opts->onto_name);
-	add_var(&script_snippet, "revisions", opts->revisions);
-	add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
-		oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
-	sq_quote_argv_pretty(&buf, opts->git_am_opts.v);
-	add_var(&script_snippet, "git_am_opt", buf.buf);
-	strbuf_release(&buf);
-	add_var(&script_snippet, "verbose",
-		opts->flags & REBASE_VERBOSE ? "t" : "");
-	add_var(&script_snippet, "diffstat",
-		opts->flags & REBASE_DIFFSTAT ? "t" : "");
-	add_var(&script_snippet, "force_rebase",
-		opts->flags & REBASE_FORCE ? "t" : "");
-	if (opts->switch_to)
-		add_var(&script_snippet, "switch_to", opts->switch_to);
-	add_var(&script_snippet, "action", opts->action ? opts->action : "");
-	add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
-	add_var(&script_snippet, "allow_rerere_autoupdate",
-		opts->allow_rerere_autoupdate ?
-			opts->allow_rerere_autoupdate == RERERE_AUTOUPDATE ?
-			"--rerere-autoupdate" : "--no-rerere-autoupdate" : "");
-	add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : "");
-	add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : "");
-	add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt);
-	add_var(&script_snippet, "cmd", opts->cmd);
-	add_var(&script_snippet, "allow_empty_message",
-		opts->allow_empty_message ?  "--allow-empty-message" : "");
-	add_var(&script_snippet, "rebase_merges",
-		opts->rebase_merges ? "t" : "");
-	add_var(&script_snippet, "rebase_cousins",
-		opts->rebase_cousins ? "t" : "");
-	add_var(&script_snippet, "strategy", opts->strategy);
-	add_var(&script_snippet, "strategy_opts", opts->strategy_opts);
-	add_var(&script_snippet, "rebase_root", opts->root ? "t" : "");
-	add_var(&script_snippet, "squash_onto",
-		opts->squash_onto ? oid_to_hex(opts->squash_onto) : "");
-	add_var(&script_snippet, "git_format_patch_opt",
-		opts->git_format_patch_opt.buf);
-
-	if (is_merge(opts) &&
-	    !(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
-		strbuf_addstr(&script_snippet,
-			      "GIT_SEQUENCE_EDITOR=:; export GIT_SEQUENCE_EDITOR; ");
-		opts->autosquash = 0;
-	}
-
-	switch (opts->type) {
-	case REBASE_PRESERVE_MERGES:
-		backend = "git-rebase--preserve-merges";
-		backend_func = "git_rebase__preserve_merges";
-		break;
-	default:
-		BUG("Unhandled rebase type %d", opts->type);
-		break;
-	}
-
-	strbuf_addf(&script_snippet,
-		    ". git-sh-setup && . %s && %s", backend, backend_func);
-	argv[0] = script_snippet.buf;
-
-	status = run_command_v_opt(argv, RUN_USING_SHELL);
-finished_rebase:
-	if (opts->dont_finish_rebase)
-		; /* do nothing */
-	else if (opts->type == REBASE_MERGE)
-		; /* merge backend cleans up after itself */
-	else if (status == 0) {
-		if (!file_exists(state_dir_path("stopped-sha", opts)))
-			finish_rebase(opts);
-	} else if (status == 2) {
-		struct strbuf dir = STRBUF_INIT;
-
-		apply_autostash(state_dir_path("autostash", opts));
-		strbuf_addstr(&dir, opts->state_dir);
-		remove_dir_recursively(&dir, 0);
-		strbuf_release(&dir);
-		die("Nothing to do");
-	}
-
-	strbuf_release(&script_snippet);
-
-	return status ? -1 : 0;
-}
-
-static int rebase_config(const char *var, const char *value, void *data)
-{
-	struct rebase_options *opts = data;
-
-	if (!strcmp(var, "rebase.stat")) {
-		if (git_config_bool(var, value))
-			opts->flags |= REBASE_DIFFSTAT;
-		else
-			opts->flags &= ~REBASE_DIFFSTAT;
-		return 0;
-	}
-
-	if (!strcmp(var, "rebase.autosquash")) {
-		opts->autosquash = git_config_bool(var, value);
-		return 0;
-	}
-
-	if (!strcmp(var, "commit.gpgsign")) {
-		free(opts->gpg_sign_opt);
-		opts->gpg_sign_opt = git_config_bool(var, value) ?
-			xstrdup("-S") : NULL;
-		return 0;
-	}
-
-	if (!strcmp(var, "rebase.autostash")) {
-		opts->autostash = git_config_bool(var, value);
-		return 0;
-	}
-
-	if (!strcmp(var, "rebase.reschedulefailedexec")) {
-		opts->reschedule_failed_exec = git_config_bool(var, value);
-		return 0;
-	}
-
-	if (!strcmp(var, "rebase.usebuiltin")) {
-		opts->use_legacy_rebase = !git_config_bool(var, value);
-		return 0;
-	}
-
-	if (!strcmp(var, "rebase.backend")) {
-		return git_config_string(&opts->default_backend, var, value);
-	}
-
-	return git_default_config(var, value, data);
-}
-
-/*
- * Determines whether the commits in from..to are linear, i.e. contain
- * no merge commits. This function *expects* `from` to be an ancestor of
- * `to`.
- */
-static int is_linear_history(struct commit *from, struct commit *to)
-{
-	while (to && to != from) {
-		parse_commit(to);
-		if (!to->parents)
-			return 1;
-		if (to->parents->next)
-			return 0;
-		to = to->parents->item;
-	}
-	return 1;
-}
-
-static int can_fast_forward(struct commit *onto, struct commit *upstream,
-			    struct commit *restrict_revision,
-			    struct object_id *head_oid, struct object_id *merge_base)
-{
-	struct commit *head = lookup_commit(the_repository, head_oid);
-	struct commit_list *merge_bases = NULL;
-	int res = 0;
-
-	if (!head)
-		goto done;
-
-	merge_bases = get_merge_bases(onto, head);
-	if (!merge_bases || merge_bases->next) {
-		oidcpy(merge_base, &null_oid);
-		goto done;
-	}
-
-	oidcpy(merge_base, &merge_bases->item->object.oid);
-	if (!oideq(merge_base, &onto->object.oid))
-		goto done;
-
-	if (restrict_revision && !oideq(&restrict_revision->object.oid, merge_base))
-		goto done;
-
-	if (!upstream)
-		goto done;
-
-	free_commit_list(merge_bases);
-	merge_bases = get_merge_bases(upstream, head);
-	if (!merge_bases || merge_bases->next)
-		goto done;
-
-	if (!oideq(&onto->object.oid, &merge_bases->item->object.oid))
-		goto done;
-
-	res = 1;
-
-done:
-	free_commit_list(merge_bases);
-	return res && is_linear_history(onto, head);
-}
-
-static int parse_opt_am(const struct option *opt, const char *arg, int unset)
-{
-	struct rebase_options *opts = opt->value;
-
-	BUG_ON_OPT_NEG(unset);
-	BUG_ON_OPT_ARG(arg);
-
-	opts->type = REBASE_APPLY;
-
-	return 0;
-}
-
-/* -i followed by -m is still -i */
-static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
-{
-	struct rebase_options *opts = opt->value;
-
-	BUG_ON_OPT_NEG(unset);
-	BUG_ON_OPT_ARG(arg);
-
-	if (!is_merge(opts))
-		opts->type = REBASE_MERGE;
-
-	return 0;
-}
-
-/* -i followed by -p is still explicitly interactive, but -p alone is not */
-static int parse_opt_interactive(const struct option *opt, const char *arg,
-				 int unset)
-{
-	struct rebase_options *opts = opt->value;
-
-	BUG_ON_OPT_NEG(unset);
-	BUG_ON_OPT_ARG(arg);
-
-	opts->type = REBASE_MERGE;
-	opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
-
-	return 0;
-}
-
-static enum empty_type parse_empty_value(const char *value)
-{
-	if (!strcasecmp(value, "drop"))
-		return EMPTY_DROP;
-	else if (!strcasecmp(value, "keep"))
-		return EMPTY_KEEP;
-	else if (!strcasecmp(value, "ask"))
-		return EMPTY_ASK;
-
-	die(_("unrecognized empty type '%s'; valid values are \"drop\", \"keep\", and \"ask\"."), value);
-}
-
-static int parse_opt_empty(const struct option *opt, const char *arg, int unset)
-{
-	struct rebase_options *options = opt->value;
-	enum empty_type value = parse_empty_value(arg);
-
-	BUG_ON_OPT_NEG(unset);
-
-	options->empty = value;
-	return 0;
-}
-
-static void NORETURN error_on_missing_default_upstream(void)
-{
-	struct branch *current_branch = branch_get(NULL);
-
-	printf(_("%s\n"
-		 "Please specify which branch you want to rebase against.\n"
-		 "See git-rebase(1) for details.\n"
-		 "\n"
-		 "    git rebase '<branch>'\n"
-		 "\n"),
-		current_branch ? _("There is no tracking information for "
-			"the current branch.") :
-			_("You are not currently on a branch."));
-
-	if (current_branch) {
-		const char *remote = current_branch->remote_name;
-
-		if (!remote)
-			remote = _("<remote>");
-
-		printf(_("If you wish to set tracking information for this "
-			 "branch you can do so with:\n"
-			 "\n"
-			 "    git branch --set-upstream-to=%s/<branch> %s\n"
-			 "\n"),
-		       remote, current_branch->name);
-	}
-	exit(1);
-}
-
-static void set_reflog_action(struct rebase_options *options)
-{
-	const char *env;
-	struct strbuf buf = STRBUF_INIT;
-
-	if (!is_merge(options))
-		return;
-
-	env = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
-	if (env && strcmp("rebase", env))
-		return; /* only override it if it is "rebase" */
-
-	strbuf_addf(&buf, "rebase (%s)", options->action);
-	setenv(GIT_REFLOG_ACTION_ENVIRONMENT, buf.buf, 1);
-	strbuf_release(&buf);
-}
-
-static int check_exec_cmd(const char *cmd)
-{
-	if (strchr(cmd, '\n'))
-		return error(_("exec commands cannot contain newlines"));
-
-	/* Does the command consist purely of whitespace? */
-	if (!cmd[strspn(cmd, " \t\r\f\v")])
-		return error(_("empty exec command"));
-
-	return 0;
-}
-
-int cmd_rebase(int argc, const char **argv, const char *prefix)
-{
-	struct rebase_options options = REBASE_OPTIONS_INIT;
-	const char *branch_name;
-	int ret, flags, total_argc, in_progress = 0;
-	int keep_base = 0;
-	int ok_to_skip_pre_rebase = 0;
-	struct strbuf msg = STRBUF_INIT;
-	struct strbuf revisions = STRBUF_INIT;
-	struct strbuf buf = STRBUF_INIT;
-	struct object_id merge_base;
-	int ignore_whitespace = 0;
-	enum action action = ACTION_NONE;
-	const char *gpg_sign = NULL;
-	struct string_list exec = STRING_LIST_INIT_NODUP;
-	const char *rebase_merges = NULL;
-	int fork_point = -1;
-	struct string_list strategy_options = STRING_LIST_INIT_NODUP;
-	struct object_id squash_onto;
-	char *squash_onto_name = NULL;
-	int reschedule_failed_exec = -1;
-	int allow_preemptive_ff = 1;
-	struct option builtin_rebase_options[] = {
-		OPT_STRING(0, "onto", &options.onto_name,
-			   N_("revision"),
-			   N_("rebase onto given branch instead of upstream")),
-		OPT_BOOL(0, "keep-base", &keep_base,
-			 N_("use the merge-base of upstream and branch as the current base")),
-		OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
-			 N_("allow pre-rebase hook to run")),
-		OPT_NEGBIT('q', "quiet", &options.flags,
-			   N_("be quiet. implies --no-stat"),
-			   REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
-		OPT_BIT('v', "verbose", &options.flags,
-			N_("display a diffstat of what changed upstream"),
-			REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
-		{OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
-			N_("do not show diffstat of what changed upstream"),
-			PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
-		OPT_BOOL(0, "signoff", &options.signoff,
-			 N_("add a Signed-off-by: line to each commit")),
-		OPT_BOOL(0, "committer-date-is-author-date",
-			 &options.committer_date_is_author_date,
-			 N_("make committer date match author date")),
-		OPT_BOOL(0, "reset-author-date", &options.ignore_date,
-			 N_("ignore author date and use current date")),
-		OPT_HIDDEN_BOOL(0, "ignore-date", &options.ignore_date,
-				N_("synonym of --reset-author-date")),
-		OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
-				  N_("passed to 'git apply'"), 0),
-		OPT_BOOL(0, "ignore-whitespace", &ignore_whitespace,
-			 N_("ignore changes in whitespace")),
-		OPT_PASSTHRU_ARGV(0, "whitespace", &options.git_am_opts,
-				  N_("action"), N_("passed to 'git apply'"), 0),
-		OPT_BIT('f', "force-rebase", &options.flags,
-			N_("cherry-pick all commits, even if unchanged"),
-			REBASE_FORCE),
-		OPT_BIT(0, "no-ff", &options.flags,
-			N_("cherry-pick all commits, even if unchanged"),
-			REBASE_FORCE),
-		OPT_CMDMODE(0, "continue", &action, N_("continue"),
-			    ACTION_CONTINUE),
-		OPT_CMDMODE(0, "skip", &action,
-			    N_("skip current patch and continue"), ACTION_SKIP),
-		OPT_CMDMODE(0, "abort", &action,
-			    N_("abort and check out the original branch"),
-			    ACTION_ABORT),
-		OPT_CMDMODE(0, "quit", &action,
-			    N_("abort but keep HEAD where it is"), ACTION_QUIT),
-		OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
-			    "during an interactive rebase"), ACTION_EDIT_TODO),
-		OPT_CMDMODE(0, "show-current-patch", &action,
-			    N_("show the patch file being applied or merged"),
-			    ACTION_SHOW_CURRENT_PATCH),
-		OPT_CALLBACK_F(0, "apply", &options, NULL,
-			N_("use apply strategies to rebase"),
-			PARSE_OPT_NOARG | PARSE_OPT_NONEG,
-			parse_opt_am),
-		OPT_CALLBACK_F('m', "merge", &options, NULL,
-			N_("use merging strategies to rebase"),
-			PARSE_OPT_NOARG | PARSE_OPT_NONEG,
-			parse_opt_merge),
-		OPT_CALLBACK_F('i', "interactive", &options, NULL,
-			N_("let the user edit the list of commits to rebase"),
-			PARSE_OPT_NOARG | PARSE_OPT_NONEG,
-			parse_opt_interactive),
-		OPT_SET_INT_F('p', "preserve-merges", &options.type,
-			      N_("(DEPRECATED) try to recreate merges instead of "
-				 "ignoring them"),
-			      REBASE_PRESERVE_MERGES, PARSE_OPT_HIDDEN),
-		OPT_RERERE_AUTOUPDATE(&options.allow_rerere_autoupdate),
-		OPT_CALLBACK_F(0, "empty", &options, "{drop,keep,ask}",
-			       N_("how to handle commits that become empty"),
-			       PARSE_OPT_NONEG, parse_opt_empty),
-		OPT_CALLBACK_F('k', "keep-empty", &options, NULL,
-			N_("keep commits which start empty"),
-			PARSE_OPT_NOARG | PARSE_OPT_HIDDEN,
-			parse_opt_keep_empty),
-		OPT_BOOL(0, "autosquash", &options.autosquash,
-			 N_("move commits that begin with "
-			    "squash!/fixup! under -i")),
-		{ OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"),
-			N_("GPG-sign commits"),
-			PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
-		OPT_AUTOSTASH(&options.autostash),
-		OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
-				N_("add exec lines after each commit of the "
-				   "editable list")),
-		OPT_BOOL_F(0, "allow-empty-message",
-			   &options.allow_empty_message,
-			   N_("allow rebasing commits with empty messages"),
-			   PARSE_OPT_HIDDEN),
-		{OPTION_STRING, 'r', "rebase-merges", &rebase_merges,
-			N_("mode"),
-			N_("try to rebase merges instead of skipping them"),
-			PARSE_OPT_OPTARG, NULL, (intptr_t)""},
-		OPT_BOOL(0, "fork-point", &fork_point,
-			 N_("use 'merge-base --fork-point' to refine upstream")),
-		OPT_STRING('s', "strategy", &options.strategy,
-			   N_("strategy"), N_("use the given merge strategy")),
-		OPT_STRING_LIST('X', "strategy-option", &strategy_options,
-				N_("option"),
-				N_("pass the argument through to the merge "
-				   "strategy")),
-		OPT_BOOL(0, "root", &options.root,
-			 N_("rebase all reachable commits up to the root(s)")),
-		OPT_BOOL(0, "reschedule-failed-exec",
-			 &reschedule_failed_exec,
-			 N_("automatically re-schedule any `exec` that fails")),
-		OPT_BOOL(0, "reapply-cherry-picks", &options.reapply_cherry_picks,
-			 N_("apply all changes, even those already present upstream")),
-		OPT_END(),
-	};
-	int i;
-
-	if (argc == 2 && !strcmp(argv[1], "-h"))
-		usage_with_options(builtin_rebase_usage,
-				   builtin_rebase_options);
-
-	options.allow_empty_message = 1;
-	git_config(rebase_config, &options);
-	/* options.gpg_sign_opt will be either "-S" or NULL */
-	gpg_sign = options.gpg_sign_opt ? "" : NULL;
-	FREE_AND_NULL(options.gpg_sign_opt);
-
-	if (options.use_legacy_rebase ||
-	    !git_env_bool("GIT_TEST_REBASE_USE_BUILTIN", -1))
-		warning(_("the rebase.useBuiltin support has been removed!\n"
-			  "See its entry in 'git help config' for details."));
-
-	strbuf_reset(&buf);
-	strbuf_addf(&buf, "%s/applying", apply_dir());
-	if(file_exists(buf.buf))
-		die(_("It looks like 'git am' is in progress. Cannot rebase."));
-
-	if (is_directory(apply_dir())) {
-		options.type = REBASE_APPLY;
-		options.state_dir = apply_dir();
-	} else if (is_directory(merge_dir())) {
-		strbuf_reset(&buf);
-		strbuf_addf(&buf, "%s/rewritten", merge_dir());
-		if (is_directory(buf.buf)) {
-			options.type = REBASE_PRESERVE_MERGES;
-			options.flags |= REBASE_INTERACTIVE_EXPLICIT;
-		} else {
-			strbuf_reset(&buf);
-			strbuf_addf(&buf, "%s/interactive", merge_dir());
-			if(file_exists(buf.buf)) {
-				options.type = REBASE_MERGE;
-				options.flags |= REBASE_INTERACTIVE_EXPLICIT;
-			} else
-				options.type = REBASE_MERGE;
-		}
-		options.state_dir = merge_dir();
-	}
-
-	if (options.type != REBASE_UNSPECIFIED)
-		in_progress = 1;
-
-	total_argc = argc;
-	argc = parse_options(argc, argv, prefix,
-			     builtin_rebase_options,
-			     builtin_rebase_usage, 0);
-
-	if (action != ACTION_NONE && total_argc != 2) {
-		usage_with_options(builtin_rebase_usage,
-				   builtin_rebase_options);
-	}
-
-	if (argc > 2)
-		usage_with_options(builtin_rebase_usage,
-				   builtin_rebase_options);
-
-	if (options.type == REBASE_PRESERVE_MERGES)
-		warning(_("git rebase --preserve-merges is deprecated. "
-			  "Use --rebase-merges instead."));
-
-	if (keep_base) {
-		if (options.onto_name)
-			die(_("cannot combine '--keep-base' with '--onto'"));
-		if (options.root)
-			die(_("cannot combine '--keep-base' with '--root'"));
-	}
-
-	if (options.root && fork_point > 0)
-		die(_("cannot combine '--root' with '--fork-point'"));
-
-	if (action != ACTION_NONE && !in_progress)
-		die(_("No rebase in progress?"));
-	setenv(GIT_REFLOG_ACTION_ENVIRONMENT, "rebase", 0);
-
-	if (action == ACTION_EDIT_TODO && !is_merge(&options))
-		die(_("The --edit-todo action can only be used during "
-		      "interactive rebase."));
-
-	if (trace2_is_enabled()) {
-		if (is_merge(&options))
-			trace2_cmd_mode("interactive");
-		else if (exec.nr)
-			trace2_cmd_mode("interactive-exec");
-		else
-			trace2_cmd_mode(action_names[action]);
-	}
-
-	switch (action) {
-	case ACTION_CONTINUE: {
-		struct object_id head;
-		struct lock_file lock_file = LOCK_INIT;
-		int fd;
-
-		options.action = "continue";
-		set_reflog_action(&options);
-
-		/* Sanity check */
-		if (get_oid("HEAD", &head))
-			die(_("Cannot read HEAD"));
-
-		fd = hold_locked_index(&lock_file, 0);
-		if (repo_read_index(the_repository) < 0)
-			die(_("could not read index"));
-		refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
-			      NULL);
-		if (0 <= fd)
-			repo_update_index_if_able(the_repository, &lock_file);
-		rollback_lock_file(&lock_file);
-
-		if (has_unstaged_changes(the_repository, 1)) {
-			puts(_("You must edit all merge conflicts and then\n"
-			       "mark them as resolved using git add"));
-			exit(1);
-		}
-		if (read_basic_state(&options))
-			exit(1);
-		goto run_rebase;
-	}
-	case ACTION_SKIP: {
-		struct string_list merge_rr = STRING_LIST_INIT_DUP;
-
-		options.action = "skip";
-		set_reflog_action(&options);
-
-		rerere_clear(the_repository, &merge_rr);
-		string_list_clear(&merge_rr, 1);
-
-		if (reset_head(the_repository, NULL, "reset", NULL, RESET_HEAD_HARD,
-			       NULL, NULL, DEFAULT_REFLOG_ACTION) < 0)
-			die(_("could not discard worktree changes"));
-		remove_branch_state(the_repository, 0);
-		if (read_basic_state(&options))
-			exit(1);
-		goto run_rebase;
-	}
-	case ACTION_ABORT: {
-		struct string_list merge_rr = STRING_LIST_INIT_DUP;
-		options.action = "abort";
-		set_reflog_action(&options);
-
-		rerere_clear(the_repository, &merge_rr);
-		string_list_clear(&merge_rr, 1);
-
-		if (read_basic_state(&options))
-			exit(1);
-		if (reset_head(the_repository, &options.orig_head, "reset",
-			       options.head_name, RESET_HEAD_HARD,
-			       NULL, NULL, DEFAULT_REFLOG_ACTION) < 0)
-			die(_("could not move back to %s"),
-			    oid_to_hex(&options.orig_head));
-		remove_branch_state(the_repository, 0);
-		ret = !!finish_rebase(&options);
-		goto cleanup;
-	}
-	case ACTION_QUIT: {
-		save_autostash(state_dir_path("autostash", &options));
-		if (options.type == REBASE_MERGE) {
-			struct replay_opts replay = REPLAY_OPTS_INIT;
-
-			replay.action = REPLAY_INTERACTIVE_REBASE;
-			ret = !!sequencer_remove_state(&replay);
-		} else {
-			strbuf_reset(&buf);
-			strbuf_addstr(&buf, options.state_dir);
-			ret = !!remove_dir_recursively(&buf, 0);
-			if (ret)
-				error(_("could not remove '%s'"),
-				       options.state_dir);
-		}
-		goto cleanup;
-	}
-	case ACTION_EDIT_TODO:
-		options.action = "edit-todo";
-		options.dont_finish_rebase = 1;
-		goto run_rebase;
-	case ACTION_SHOW_CURRENT_PATCH:
-		options.action = "show-current-patch";
-		options.dont_finish_rebase = 1;
-		goto run_rebase;
-	case ACTION_NONE:
-		break;
-	default:
-		BUG("action: %d", action);
-	}
-
-	/* Make sure no rebase is in progress */
-	if (in_progress) {
-		const char *last_slash = strrchr(options.state_dir, '/');
-		const char *state_dir_base =
-			last_slash ? last_slash + 1 : options.state_dir;
-		const char *cmd_live_rebase =
-			"git rebase (--continue | --abort | --skip)";
-		strbuf_reset(&buf);
-		strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
-		die(_("It seems that there is already a %s directory, and\n"
-		      "I wonder if you are in the middle of another rebase.  "
-		      "If that is the\n"
-		      "case, please try\n\t%s\n"
-		      "If that is not the case, please\n\t%s\n"
-		      "and run me again.  I am stopping in case you still "
-		      "have something\n"
-		      "valuable there.\n"),
-		    state_dir_base, cmd_live_rebase, buf.buf);
-	}
-
-	if ((options.flags & REBASE_INTERACTIVE_EXPLICIT) ||
-	    (action != ACTION_NONE) ||
-	    (exec.nr > 0) ||
-	    options.autosquash) {
-		allow_preemptive_ff = 0;
-	}
-	if (options.committer_date_is_author_date || options.ignore_date)
-		options.flags |= REBASE_FORCE;
-
-	for (i = 0; i < options.git_am_opts.nr; i++) {
-		const char *option = options.git_am_opts.v[i], *p;
-		if (!strcmp(option, "--whitespace=fix") ||
-		    !strcmp(option, "--whitespace=strip"))
-			allow_preemptive_ff = 0;
-		else if (skip_prefix(option, "-C", &p)) {
-			while (*p)
-				if (!isdigit(*(p++)))
-					die(_("switch `C' expects a "
-					      "numerical value"));
-		} else if (skip_prefix(option, "--whitespace=", &p)) {
-			if (*p && strcmp(p, "warn") && strcmp(p, "nowarn") &&
-			    strcmp(p, "error") && strcmp(p, "error-all"))
-				die("Invalid whitespace option: '%s'", p);
-		}
-	}
-
-	for (i = 0; i < exec.nr; i++)
-		if (check_exec_cmd(exec.items[i].string))
-			exit(1);
-
-	if (!(options.flags & REBASE_NO_QUIET))
-		strvec_push(&options.git_am_opts, "-q");
-
-	if (options.empty != EMPTY_UNSPECIFIED)
-		imply_merge(&options, "--empty");
-
-	if (options.reapply_cherry_picks)
-		imply_merge(&options, "--reapply-cherry-picks");
-
-	if (gpg_sign)
-		options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
-
-	if (exec.nr) {
-		int i;
-
-		imply_merge(&options, "--exec");
-
-		strbuf_reset(&buf);
-		for (i = 0; i < exec.nr; i++)
-			strbuf_addf(&buf, "exec %s\n", exec.items[i].string);
-		options.cmd = xstrdup(buf.buf);
-	}
-
-	if (rebase_merges) {
-		if (!*rebase_merges)
-			; /* default mode; do nothing */
-		else if (!strcmp("rebase-cousins", rebase_merges))
-			options.rebase_cousins = 1;
-		else if (strcmp("no-rebase-cousins", rebase_merges))
-			die(_("Unknown mode: %s"), rebase_merges);
-		options.rebase_merges = 1;
-		imply_merge(&options, "--rebase-merges");
-	}
-
-	if (options.type == REBASE_APPLY) {
-		if (ignore_whitespace)
-			strvec_push(&options.git_am_opts,
-				    "--ignore-whitespace");
-		if (options.committer_date_is_author_date)
-			strvec_push(&options.git_am_opts,
-				    "--committer-date-is-author-date");
-		if (options.ignore_date)
-			strvec_push(&options.git_am_opts, "--ignore-date");
-	} else {
-		/* REBASE_MERGE and PRESERVE_MERGES */
-		if (ignore_whitespace) {
-			string_list_append(&strategy_options,
-					   "ignore-space-change");
-		}
-	}
-
-	if (strategy_options.nr) {
-		int i;
-
-		if (!options.strategy)
-			options.strategy = "recursive";
-
-		strbuf_reset(&buf);
-		for (i = 0; i < strategy_options.nr; i++)
-			strbuf_addf(&buf, " --%s",
-				    strategy_options.items[i].string);
-		options.strategy_opts = xstrdup(buf.buf);
-	}
-
-	if (options.strategy) {
-		options.strategy = xstrdup(options.strategy);
-		switch (options.type) {
-		case REBASE_APPLY:
-			die(_("--strategy requires --merge or --interactive"));
-		case REBASE_MERGE:
-		case REBASE_PRESERVE_MERGES:
-			/* compatible */
-			break;
-		case REBASE_UNSPECIFIED:
-			options.type = REBASE_MERGE;
-			break;
-		default:
-			BUG("unhandled rebase type (%d)", options.type);
-		}
-	}
-
-	if (options.type == REBASE_MERGE)
-		imply_merge(&options, "--merge");
-
-	if (options.root && !options.onto_name)
-		imply_merge(&options, "--root without --onto");
-
-	if (isatty(2) && options.flags & REBASE_NO_QUIET)
-		strbuf_addstr(&options.git_format_patch_opt, " --progress");
-
-	if (options.git_am_opts.nr || options.type == REBASE_APPLY) {
-		/* all am options except -q are compatible only with --apply */
-		for (i = options.git_am_opts.nr - 1; i >= 0; i--)
-			if (strcmp(options.git_am_opts.v[i], "-q"))
-				break;
-
-		if (i >= 0) {
-			if (is_merge(&options))
-				die(_("cannot combine apply options with "
-				      "merge options"));
-			else
-				options.type = REBASE_APPLY;
-		}
-	}
-
-	if (options.type == REBASE_UNSPECIFIED) {
-		if (!strcmp(options.default_backend, "merge"))
-			imply_merge(&options, "--merge");
-		else if (!strcmp(options.default_backend, "apply"))
-			options.type = REBASE_APPLY;
-		else
-			die(_("Unknown rebase backend: %s"),
-			    options.default_backend);
-	}
-
-	switch (options.type) {
-	case REBASE_MERGE:
-	case REBASE_PRESERVE_MERGES:
-		options.state_dir = merge_dir();
-		break;
-	case REBASE_APPLY:
-		options.state_dir = apply_dir();
-		break;
-	default:
-		BUG("options.type was just set above; should be unreachable.");
-	}
-
-	if (options.empty == EMPTY_UNSPECIFIED) {
-		if (options.flags & REBASE_INTERACTIVE_EXPLICIT)
-			options.empty = EMPTY_ASK;
-		else if (exec.nr > 0)
-			options.empty = EMPTY_KEEP;
-		else
-			options.empty = EMPTY_DROP;
-	}
-	if (reschedule_failed_exec > 0 && !is_merge(&options))
-		die(_("--reschedule-failed-exec requires "
-		      "--exec or --interactive"));
-	if (reschedule_failed_exec >= 0)
-		options.reschedule_failed_exec = reschedule_failed_exec;
-
-	if (options.signoff) {
-		if (options.type == REBASE_PRESERVE_MERGES)
-			die("cannot combine '--signoff' with "
-			    "'--preserve-merges'");
-		strvec_push(&options.git_am_opts, "--signoff");
-		options.flags |= REBASE_FORCE;
-	}
-
-	if (options.type == REBASE_PRESERVE_MERGES) {
-		/*
-		 * Note: incompatibility with --signoff handled in signoff block above
-		 * Note: incompatibility with --interactive is just a strong warning;
-		 *       git-rebase.txt caveats with "unless you know what you are doing"
-		 */
-		if (options.rebase_merges)
-			die(_("cannot combine '--preserve-merges' with "
-			      "'--rebase-merges'"));
-
-		if (options.reschedule_failed_exec)
-			die(_("error: cannot combine '--preserve-merges' with "
-			      "'--reschedule-failed-exec'"));
-	}
-
-	if (!options.root) {
-		if (argc < 1) {
-			struct branch *branch;
-
-			branch = branch_get(NULL);
-			options.upstream_name = branch_get_upstream(branch,
-								    NULL);
-			if (!options.upstream_name)
-				error_on_missing_default_upstream();
-			if (fork_point < 0)
-				fork_point = 1;
-		} else {
-			options.upstream_name = argv[0];
-			argc--;
-			argv++;
-			if (!strcmp(options.upstream_name, "-"))
-				options.upstream_name = "@{-1}";
-		}
-		options.upstream = peel_committish(options.upstream_name);
-		if (!options.upstream)
-			die(_("invalid upstream '%s'"), options.upstream_name);
-		options.upstream_arg = options.upstream_name;
-	} else {
-		if (!options.onto_name) {
-			if (commit_tree("", 0, the_hash_algo->empty_tree, NULL,
-					&squash_onto, NULL, NULL) < 0)
-				die(_("Could not create new root commit"));
-			options.squash_onto = &squash_onto;
-			options.onto_name = squash_onto_name =
-				xstrdup(oid_to_hex(&squash_onto));
-		} else
-			options.root_with_onto = 1;
-
-		options.upstream_name = NULL;
-		options.upstream = NULL;
-		if (argc > 1)
-			usage_with_options(builtin_rebase_usage,
-					   builtin_rebase_options);
-		options.upstream_arg = "--root";
-	}
-
-	/* Make sure the branch to rebase onto is valid. */
-	if (keep_base) {
-		strbuf_reset(&buf);
-		strbuf_addstr(&buf, options.upstream_name);
-		strbuf_addstr(&buf, "...");
-		options.onto_name = xstrdup(buf.buf);
-	} else if (!options.onto_name)
-		options.onto_name = options.upstream_name;
-	if (strstr(options.onto_name, "...")) {
-		if (get_oid_mb(options.onto_name, &merge_base) < 0) {
-			if (keep_base)
-				die(_("'%s': need exactly one merge base with branch"),
-				    options.upstream_name);
-			else
-				die(_("'%s': need exactly one merge base"),
-				    options.onto_name);
-		}
-		options.onto = lookup_commit_or_die(&merge_base,
-						    options.onto_name);
-	} else {
-		options.onto = peel_committish(options.onto_name);
-		if (!options.onto)
-			die(_("Does not point to a valid commit '%s'"),
-				options.onto_name);
-	}
-
-	/*
-	 * If the branch to rebase is given, that is the branch we will rebase
-	 * branch_name -- branch/commit being rebased, or
-	 * 		  HEAD (already detached)
-	 * orig_head -- commit object name of tip of the branch before rebasing
-	 * head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
-	 */
-	if (argc == 1) {
-		/* Is it "rebase other branchname" or "rebase other commit"? */
-		branch_name = argv[0];
-		options.switch_to = argv[0];
-
-		/* Is it a local branch? */
-		strbuf_reset(&buf);
-		strbuf_addf(&buf, "refs/heads/%s", branch_name);
-		if (!read_ref(buf.buf, &options.orig_head)) {
-			die_if_checked_out(buf.buf, 1);
-			options.head_name = xstrdup(buf.buf);
-		/* If not is it a valid ref (branch or commit)? */
-		} else if (!get_oid(branch_name, &options.orig_head))
-			options.head_name = NULL;
-		else
-			die(_("fatal: no such branch/commit '%s'"),
-			    branch_name);
-	} else if (argc == 0) {
-		/* Do not need to switch branches, we are already on it. */
-		options.head_name =
-			xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
-					 &flags));
-		if (!options.head_name)
-			die(_("No such ref: %s"), "HEAD");
-		if (flags & REF_ISSYMREF) {
-			if (!skip_prefix(options.head_name,
-					 "refs/heads/", &branch_name))
-				branch_name = options.head_name;
-
-		} else {
-			FREE_AND_NULL(options.head_name);
-			branch_name = "HEAD";
-		}
-		if (get_oid("HEAD", &options.orig_head))
-			die(_("Could not resolve HEAD to a revision"));
-	} else
-		BUG("unexpected number of arguments left to parse");
-
-	if (fork_point > 0) {
-		struct commit *head =
-			lookup_commit_reference(the_repository,
-						&options.orig_head);
-		options.restrict_revision =
-			get_fork_point(options.upstream_name, head);
-	}
-
-	if (repo_read_index(the_repository) < 0)
-		die(_("could not read index"));
-
-	if (options.autostash) {
-		create_autostash(the_repository, state_dir_path("autostash", &options),
-				 DEFAULT_REFLOG_ACTION);
-	}
-
-	if (require_clean_work_tree(the_repository, "rebase",
-				    _("Please commit or stash them."), 1, 1)) {
-		ret = 1;
-		goto cleanup;
-	}
-
-	/*
-	 * Now we are rebasing commits upstream..orig_head (or with --root,
-	 * everything leading up to orig_head) on top of onto.
-	 */
-
-	/*
-	 * Check if we are already based on onto with linear history,
-	 * in which case we could fast-forward without replacing the commits
-	 * with new commits recreated by replaying their changes.
-	 *
-	 * Note that can_fast_forward() initializes merge_base, so we have to
-	 * call it before checking allow_preemptive_ff.
-	 */
-	if (can_fast_forward(options.onto, options.upstream, options.restrict_revision,
-		    &options.orig_head, &merge_base) &&
-	    allow_preemptive_ff) {
-		int flag;
-
-		if (!(options.flags & REBASE_FORCE)) {
-			/* Lazily switch to the target branch if needed... */
-			if (options.switch_to) {
-				strbuf_reset(&buf);
-				strbuf_addf(&buf, "%s: checkout %s",
-					    getenv(GIT_REFLOG_ACTION_ENVIRONMENT),
-					    options.switch_to);
-				if (reset_head(the_repository,
-					       &options.orig_head, "checkout",
-					       options.head_name,
-					       RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
-					       NULL, buf.buf,
-					       DEFAULT_REFLOG_ACTION) < 0) {
-					ret = !!error(_("could not switch to "
-							"%s"),
-						      options.switch_to);
-					goto cleanup;
-				}
-			}
-
-			if (!(options.flags & REBASE_NO_QUIET))
-				; /* be quiet */
-			else if (!strcmp(branch_name, "HEAD") &&
-				 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
-				puts(_("HEAD is up to date."));
-			else
-				printf(_("Current branch %s is up to date.\n"),
-				       branch_name);
-			ret = !!finish_rebase(&options);
-			goto cleanup;
-		} else if (!(options.flags & REBASE_NO_QUIET))
-			; /* be quiet */
-		else if (!strcmp(branch_name, "HEAD") &&
-			 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
-			puts(_("HEAD is up to date, rebase forced."));
-		else
-			printf(_("Current branch %s is up to date, rebase "
-				 "forced.\n"), branch_name);
-	}
-
-	/* If a hook exists, give it a chance to interrupt*/
-	if (!ok_to_skip_pre_rebase &&
-	    run_hook_le(NULL, "pre-rebase", options.upstream_arg,
-			argc ? argv[0] : NULL, NULL))
-		die(_("The pre-rebase hook refused to rebase."));
-
-	if (options.flags & REBASE_DIFFSTAT) {
-		struct diff_options opts;
-
-		if (options.flags & REBASE_VERBOSE) {
-			if (is_null_oid(&merge_base))
-				printf(_("Changes to %s:\n"),
-				       oid_to_hex(&options.onto->object.oid));
-			else
-				printf(_("Changes from %s to %s:\n"),
-				       oid_to_hex(&merge_base),
-				       oid_to_hex(&options.onto->object.oid));
-		}
-
-		/* We want color (if set), but no pager */
-		diff_setup(&opts);
-		opts.stat_width = -1; /* use full terminal width */
-		opts.stat_graph_width = -1; /* respect statGraphWidth config */
-		opts.output_format |=
-			DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
-		opts.detect_rename = DIFF_DETECT_RENAME;
-		diff_setup_done(&opts);
-		diff_tree_oid(is_null_oid(&merge_base) ?
-			      the_hash_algo->empty_tree : &merge_base,
-			      &options.onto->object.oid, "", &opts);
-		diffcore_std(&opts);
-		diff_flush(&opts);
-	}
-
-	if (is_merge(&options))
-		goto run_rebase;
-
-	/* Detach HEAD and reset the tree */
-	if (options.flags & REBASE_NO_QUIET)
-		printf(_("First, rewinding head to replay your work on top of "
-			 "it...\n"));
-
-	strbuf_addf(&msg, "%s: checkout %s",
-		    getenv(GIT_REFLOG_ACTION_ENVIRONMENT), options.onto_name);
-	if (reset_head(the_repository, &options.onto->object.oid, "checkout", NULL,
-		       RESET_HEAD_DETACH | RESET_ORIG_HEAD |
-		       RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
-		       NULL, msg.buf, DEFAULT_REFLOG_ACTION))
-		die(_("Could not detach HEAD"));
-	strbuf_release(&msg);
-
-	/*
-	 * If the onto is a proper descendant of the tip of the branch, then
-	 * we just fast-forwarded.
-	 */
-	strbuf_reset(&msg);
-	if (oideq(&merge_base, &options.orig_head)) {
-		printf(_("Fast-forwarded %s to %s.\n"),
-			branch_name, options.onto_name);
-		strbuf_addf(&msg, "rebase finished: %s onto %s",
-			options.head_name ? options.head_name : "detached HEAD",
-			oid_to_hex(&options.onto->object.oid));
-		reset_head(the_repository, NULL, "Fast-forwarded", options.head_name,
-			   RESET_HEAD_REFS_ONLY, "HEAD", msg.buf,
-			   DEFAULT_REFLOG_ACTION);
-		strbuf_release(&msg);
-		ret = !!finish_rebase(&options);
-		goto cleanup;
-	}
-
-	strbuf_addf(&revisions, "%s..%s",
-		    options.root ? oid_to_hex(&options.onto->object.oid) :
-		    (options.restrict_revision ?
-		     oid_to_hex(&options.restrict_revision->object.oid) :
-		     oid_to_hex(&options.upstream->object.oid)),
-		    oid_to_hex(&options.orig_head));
-
-	options.revisions = revisions.buf;
-
-run_rebase:
-	ret = !!run_specific_rebase(&options, action);
-
-cleanup:
-	strbuf_release(&buf);
-	strbuf_release(&revisions);
-	free(options.head_name);
-	free(options.gpg_sign_opt);
-	free(options.cmd);
-	free(squash_onto_name);
-	return ret;
-}