//.........这里部分代码省略.........
		if (ret) {
			/*
			 * The backend exits with 1 when conflicts are
			 * left to be resolved, with 2 when it does not
			 * handle the given merge at all.
			 */
			if (ret == 1) {
				int cnt = evaluate_result();

				if (best_cnt <= 0 || cnt <= best_cnt) {
					best_strategy = use_strategies[i]->name;
					best_cnt = cnt;
				}
			}
			if (merge_was_ok)
				break;
			else
				continue;
		}

		/* Automerge succeeded. */
		write_tree_trivial(result_tree);
		automerge_was_ok = 1;
		break;
	}

	/*
	 * If we have a resulting tree, that means the strategy module
	 * auto resolved the merge cleanly.
	 */
	if (automerge_was_ok)
		return finish_automerge(common, result_tree, wt_strategy);

	/*
	 * Pick the result from the best strategy and have the user fix
	 * it up.
	 */
	if (!best_strategy) {
		restore_state();
		if (use_strategies_nr > 1)
			fprintf(stderr,
				"No merge strategy handled the merge.\n");
		else
			fprintf(stderr, "Merge with strategy %s failed.\n",
				use_strategies[0]->name);
		return 2;
	} else if (best_strategy == wt_strategy)
		; /* We already have its result in the working tree. */
	else {
		printf("Rewinding the tree to pristine...\n");
		restore_state();
		printf("Using the %s to prepare resolving by hand.\n",
			best_strategy);
		try_merge_strategy(best_strategy, common, head_arg);
	}

	if (squash)
		finish(NULL, NULL);
	else {
		int fd;
		struct commit_list *j;

		for (j = remoteheads; j; j = j->next)
			strbuf_addf(&buf, "%s\n",
				sha1_to_hex(j->item->object.sha1));
		fd = open(git_path("MERGE_HEAD"), O_WRONLY | O_CREAT, 0666);
		if (fd < 0)
			die_errno("Could not open '%s' for writing",
				  git_path("MERGE_HEAD"));
		if (write_in_full(fd, buf.buf, buf.len) != buf.len)
			die_errno("Could not write to '%s'", git_path("MERGE_HEAD"));
		close(fd);
		strbuf_addch(&merge_msg, '\n');
		fd = open(git_path("MERGE_MSG"), O_WRONLY | O_CREAT, 0666);
		if (fd < 0)
			die_errno("Could not open '%s' for writing",
				  git_path("MERGE_MSG"));
		if (write_in_full(fd, merge_msg.buf, merge_msg.len) !=
			merge_msg.len)
			die_errno("Could not write to '%s'", git_path("MERGE_MSG"));
		close(fd);
		fd = open(git_path("MERGE_MODE"), O_WRONLY | O_CREAT | O_TRUNC, 0666);
		if (fd < 0)
			die_errno("Could not open '%s' for writing",
				  git_path("MERGE_MODE"));
		strbuf_reset(&buf);
		if (!allow_fast_forward)
			strbuf_addf(&buf, "no-ff");
		if (write_in_full(fd, buf.buf, buf.len) != buf.len)
			die_errno("Could not write to '%s'", git_path("MERGE_MODE"));
		close(fd);
	}

	if (merge_was_ok) {
		fprintf(stderr, "Automatic merge went well; "
			"stopped before committing as requested\n");
		return 0;
	} else
		return suggest_conflicts();
}

//.........这里部分代码省略.........
		warning(_("--local is ignored"));

	if (argc == 2)
		dir = xstrdup(argv[1]);
	else
		dir = guess_dir_name(repo_name, is_bundle, option_bare);
	strip_trailing_slashes(dir);

	dest_exists = !stat(dir, &buf);
	if (dest_exists && !is_empty_dir(dir))
		die(_("destination path '%s' already exists and is not "
			"an empty directory."), dir);

	strbuf_addf(&reflog_msg, "clone: from %s", repo);

	if (option_bare)
		work_tree = NULL;
	else {
		work_tree = getenv("GIT_WORK_TREE");
		if (work_tree && !stat(work_tree, &buf))
			die(_("working tree '%s' already exists."), work_tree);
	}

	if (option_bare || work_tree)
		git_dir = xstrdup(dir);
	else {
		work_tree = dir;
		git_dir = mkpathdup("%s/.git", dir);
	}

	if (!option_bare) {
		junk_work_tree = work_tree;
		if (safe_create_leading_directories_const(work_tree) < 0)
			die_errno(_("could not create leading directories of '%s'"),
				  work_tree);
		if (!dest_exists && mkdir(work_tree, 0777))
			die_errno(_("could not create work tree dir '%s'."),
				  work_tree);
		set_git_work_tree(work_tree);
	}
	junk_git_dir = git_dir;
	atexit(remove_junk);
	sigchain_push_common(remove_junk_on_signal);

	if (safe_create_leading_directories_const(git_dir) < 0)
		die(_("could not create leading directories of '%s'"), git_dir);

	set_git_dir_init(git_dir, real_git_dir, 0);
	if (real_git_dir) {
		git_dir = real_git_dir;
		junk_git_dir = real_git_dir;
	}

	if (0 <= option_verbosity) {
		if (option_bare)
			printf(_("Cloning into bare repository '%s'...\n"), dir);
		else
			printf(_("Cloning into '%s'...\n"), dir);
	}
	init_db(option_template, INIT_DB_QUIET);
	write_config(&option_config);

	git_config(git_default_config, NULL);

	if (option_bare) {
		if (option_mirror)

int chk_positive(int result, char *msg)
{
	if (result <= 0)
		die_errno("%s", msg);
	return result;
}

static int cmd_import(const char *line)
{
	int code;
	int dumpin_fd;
	char *note_msg;
	struct object_id head_oid;
	unsigned int startrev;
	struct child_process svndump_proc = CHILD_PROCESS_INIT;
	const char *command = "svnrdump";

	if (read_ref(private_ref, &head_oid))
		startrev = 0;
	else {
		note_msg = read_ref_note(&head_oid);
		if(note_msg == NULL) {
			warning("No note found for %s.", private_ref);
			startrev = 0;
		} else {
			struct rev_note note = { 0 };
			if (parse_rev_note(note_msg, &note))
				die("Revision number couldn't be parsed from note.");
			startrev = note.rev_nr + 1;
			free(note_msg);
		}
	}
	check_or_regenerate_marks(startrev - 1);

	if (dump_from_file) {
		dumpin_fd = open(url, O_RDONLY);
		if(dumpin_fd < 0)
			die_errno("Couldn't open svn dump file %s.", url);
	} else {
		svndump_proc.out = -1;
		argv_array_push(&svndump_proc.args, command);
		argv_array_push(&svndump_proc.args, "dump");
		argv_array_push(&svndump_proc.args, url);
		argv_array_pushf(&svndump_proc.args, "-r%u:HEAD", startrev);

		code = start_command(&svndump_proc);
		if (code)
			die("Unable to start %s, code %d", command, code);
		dumpin_fd = svndump_proc.out;
	}
	/* setup marks file import/export */
	printf("feature import-marks-if-exists=%s\n"
			"feature export-marks=%s\n", marksfilename, marksfilename);

	svndump_init_fd(dumpin_fd, STDIN_FILENO);
	svndump_read(url, private_ref, notes_ref);
	svndump_deinit();
	svndump_reset();

	close(dumpin_fd);
	if (!dump_from_file) {
		code = finish_command(&svndump_proc);
		if (code)
			warning("%s, returned %d", command, code);
	}

	return 0;
}

//.........这里部分代码省略.........
        goto reattach_failed;
    }
    if (strcmp(u.sysname, "Darwin")) {
        warn("unsupported OS sysname: %s", u.sysname);
        goto reattach_failed;
    }

    char *rest, *whole = strdup(u.release);
    if (!whole) {
        warn_errno("strdup failed");
        goto reattach_failed;
    }
    rest = whole;
    strsep(&rest, ".");
    if (whole && *whole && whole != rest) {
        int major = atoi(whole);
        os = 100000;    /* 10.1, 10.0 and prior betas/previews */
        if (major >= 6) /* 10.2 and newer */
            os += (major-4) * 100;
    }
    else
        warn("unparsable major release number: '%s'", u.release);

    free(whole);

    /*
     * change the 'os' variable to represent the "reattach variation"
     * instead of the major OS release
     *
     *  older => 100500 with warning
     *   10.5 => 100500
     *   10.6 => 100600
     *   10.7 => 100600
     *   10.8 => 100600
     *   10.9 => 100600
     *   10.10=> 101000
     *   10.11=> 101000
     *   10.12=> 101000
     *  newer => 101000 with warning
     */
    if (100600 <= os && os <= 100900)
        os = 100600;
    else if (101000 <= os && os <= 101200)
      os = 101000;
    else if (os < 100500) {
        warn("%s: unsupported old OS, trying as if it were 10.5", argv[0]);
        os = 100500;
    } else if (os > 101200) {
        warn("%s: unsupported new OS, trying as if it were 10.10", argv[0]);
        os = 101000;
    }

    if (move_to_user_namespace(os) != 0) {
reattach_failed:
        warn("%s: unable to reattach", argv[0]);
    }

    char **newargs = NULL;
    const char *file = argv[1];
    if (login) {
        /*
         * For their argv[0], take the bit of file after the
         * last slash (the whole thing if there is no slash
         * or if that bit would be zero length) and prefix
         * it with '-'.
         */
        char *arg0 = malloc(strlen(file) + 2);
        if (!arg0)
            goto exec_it;
        *arg0 = '-';
        char *slash = strrchr(file, '/');
        if (slash && slash[1])
            strcpy(arg0+1, slash+1);
        else
            strcpy(arg0+1, file);

        /* use the rest of the args as they are */
        newargs = malloc(sizeof(*newargs) * (argc));
        if (!newargs) {
            free(arg0);
            goto exec_it;
        }
        newargs[0] = arg0;
        int arg = 2;
        for(; arg < argc; arg++)
            newargs[arg-1] = argv[arg];
        newargs[arg-1] = NULL;
    }

exec_it:
    if (execvp(file, newargs ? newargs : argv+1) < 0)
        die_errno(3, "%s: execv failed", argv[0]);

    if (newargs) {
        free(newargs[0]);
        free(newargs);
    }

    return 0;
}

int main(int argc, char **argv)
{
	char *prog;
	struct commands *cmd;
	int devnull_fd;

	/*
	 * Always open file descriptors 0/1/2 to avoid clobbering files
	 * in die().  It also avoids not messing up when the pipes are
	 * dup'ed onto stdin/stdout/stderr in the child processes we spawn.
	 */
	devnull_fd = open("/dev/null", O_RDWR);
	while (devnull_fd >= 0 && devnull_fd <= 2)
		devnull_fd = dup(devnull_fd);
	if (devnull_fd == -1)
		die_errno("opening /dev/null failed");
	close (devnull_fd);

	/*
	 * Special hack to pretend to be a CVS server
	 */
	if (argc == 2 && !strcmp(argv[1], "cvs server"))
		argv--;

	/*
	 * We do not accept anything but "-c" followed by "cmd arg",
	 * where "cmd" is a very limited subset of git commands.
	 */
	else if (argc != 3 || strcmp(argv[1], "-c")) {
		if (chdir(COMMAND_DIR))
			die("Sorry, the interactive git-shell is not enabled");
		for (;;) {
			prog = readline("git> ");
			if (prog == NULL) {
				printf("\n");
				exit(0);
			} else if (!strcmp(prog, "quit") || !strcmp(prog, "logout") ||
				   !strcmp(prog, "exit")) {
				exit(0);
			} else if (!strcmp(prog, "")) {
			} else if (is_valid_cmd_name(prog)) {
				run(prog);
				add_history(prog);
			} else {
				printf("invalid command format '%s'\n", prog);
			}
			free(prog);
		};
	}

	prog = argv[2];
	if (!strncmp(prog, "git", 3) && isspace(prog[3]))
		/* Accept "git foo" as if the caller said "git-foo". */
		prog[3] = '-';

	for (cmd = cmd_list ; cmd->name ; cmd++) {
		int len = strlen(cmd->name);
		char *arg;
		if (strncmp(cmd->name, prog, len))
			continue;
		arg = NULL;
		switch (prog[len]) {
		case '\0':
			arg = NULL;
			break;
		case ' ':
			arg = prog + len + 1;
			break;
		default:
			continue;
		}
		exit(cmd->exec(cmd->name, arg));
	}

	if (chdir(COMMAND_DIR))
		die("unrecognized command '%s'", prog);

	if (is_valid_cmd_name(prog))
		execl(prog, prog, (char *) NULL);

	die("unrecognized command '%s'", prog);
}

//.........这里部分代码省略.........
	if (argc == 2)
		dir = xstrdup(argv[1]);
	else
		dir = guess_dir_name(repo_name, is_bundle, option_bare);
	strip_trailing_slashes(dir);

	dest_exists = !stat(dir, &buf);
	if (dest_exists && !is_empty_dir(dir))
		die(_("destination path '%s' already exists and is not "
			"an empty directory."), dir);

	strbuf_addf(&reflog_msg, "clone: from %s", repo);

	if (option_bare)
		work_tree = NULL;
	else {
		work_tree = getenv("GIT_WORK_TREE");
		if (work_tree && !stat(work_tree, &buf))
			die(_("working tree '%s' already exists."), work_tree);
	}

	if (option_bare || work_tree)
		git_dir = xstrdup(dir);
	else {
		work_tree = dir;
		git_dir = mkpathdup("%s/.git", dir);
	}

	atexit(remove_junk);
	sigchain_push_common(remove_junk_on_signal);

	if (!option_bare) {
		if (safe_create_leading_directories_const(work_tree) < 0)
			die_errno(_("could not create leading directories of '%s'"),
				  work_tree);
		if (!dest_exists && mkdir(work_tree, 0777))
			die_errno(_("could not create work tree dir '%s'"),
				  work_tree);
		junk_work_tree = work_tree;
		set_git_work_tree(work_tree);
	}

	junk_git_dir = real_git_dir ? real_git_dir : git_dir;
	if (safe_create_leading_directories_const(git_dir) < 0)
		die(_("could not create leading directories of '%s'"), git_dir);

	if (0 <= option_verbosity) {
		if (option_bare)
			fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
		else
			fprintf(stderr, _("Cloning into '%s'...\n"), dir);
	}

	if (option_recursive) {
		if (option_required_reference.nr &&
		    option_optional_reference.nr)
			die(_("clone --recursive is not compatible with "
			      "both --reference and --reference-if-able"));
		else if (option_required_reference.nr) {
			string_list_append(&option_config,
				"submodule.alternateLocation=superproject");
			string_list_append(&option_config,
				"submodule.alternateErrorStrategy=die");
		} else if (option_optional_reference.nr) {
			string_list_append(&option_config,
				"submodule.alternateLocation=superproject");

//.........这里部分代码省略.........
		if (cmd->no_stdin)
			dup_devnull(0);
		else if (need_in) {
			dup2(fdin[0], 0);
			close_pair(fdin);
		} else if (cmd->in) {
			dup2(cmd->in, 0);
			close(cmd->in);
		}

		if (cmd->no_stderr)
			dup_devnull(2);
		else if (need_err) {
			dup2(fderr[1], 2);
			close_pair(fderr);
		} else if (cmd->err > 1) {
			dup2(cmd->err, 2);
			close(cmd->err);
		}

		if (cmd->no_stdout)
			dup_devnull(1);
		else if (cmd->stdout_to_stderr)
			dup2(2, 1);
		else if (need_out) {
			dup2(fdout[1], 1);
			close_pair(fdout);
		} else if (cmd->out > 1) {
			dup2(cmd->out, 1);
			close(cmd->out);
		}

		if (cmd->dir && chdir(cmd->dir))
			die_errno("exec '%s': cd to '%s' failed", cmd->argv[0],
			    cmd->dir);
		if (cmd->env) {
			for (; *cmd->env; cmd->env++) {
				if (strchr(*cmd->env, '='))
					putenv((char *)*cmd->env);
				else
					unsetenv(*cmd->env);
			}
		}
		if (cmd->preexec_cb) {
			/*
			 * We cannot predict what the pre-exec callback does.
			 * Forgo parent notification.
			 */
			close(child_notifier);
			child_notifier = -1;

			cmd->preexec_cb();
		}
		if (cmd->git_cmd) {
			execv_git_cmd(cmd->argv);
		} else if (cmd->use_shell) {
			execv_shell_cmd(cmd->argv);
		} else {
			execvp(cmd->argv[0], (char *const*) cmd->argv);
		}
		/*
		 * Do not check for cmd->silent_exec_failure; the parent
		 * process will check it when it sees this exit code.
		 */
		if (errno == ENOENT)
			exit(127);

//.........这里部分代码省略.........
								* sizeof(char *));
					}

					dst = add_slash(dst);
					dst_len = strlen(dst);

					for (j = 0; j < last - first; j++) {
						const char *path =
							active_cache[first + j]->name;
						source[argc + j] = path;
						destination[argc + j] =
							prefix_path(dst, dst_len,
								path + length + 1);
						modes[argc + j] = INDEX;
						submodule_gitfile[argc + j] = NULL;
					}
					argc += last - first;
				}
			}
		} else if (cache_name_pos(src, length) < 0)
			bad = _("not under version control");
		else if (lstat(dst, &st) == 0) {
			bad = _("destination exists");
			if (force) {
				/*
				 * only files can overwrite each other:
				 * check both source and destination
				 */
				if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
					if (verbose)
						warning(_("overwriting '%s'"), dst);
					bad = NULL;
				} else
					bad = _("Cannot overwrite");
			}
		} else if (string_list_has_string(&src_for_dst, dst))
			bad = _("multiple sources for the same target");
		else if (is_dir_sep(dst[strlen(dst) - 1]))
			bad = _("destination directory does not exist");
		else
			string_list_insert(&src_for_dst, dst);

		if (bad) {
			if (ignore_errors) {
				if (--argc > 0) {
					memmove(source + i, source + i + 1,
						(argc - i) * sizeof(char *));
					memmove(destination + i,
						destination + i + 1,
						(argc - i) * sizeof(char *));
					memmove(modes + i, modes + i + 1,
						(argc - i) * sizeof(enum update_mode));
					memmove(submodule_gitfile + i,
						submodule_gitfile + i + 1,
						(argc - i) * sizeof(char *));
					i--;
				}
			} else
				die (_("%s, source=%s, destination=%s"),
				     bad, src, dst);
		}
	}

	for (i = 0; i < argc; i++) {
		const char *src = source[i], *dst = destination[i];
		enum update_mode mode = modes[i];
		int pos;
		if (show_only || verbose)
			printf(_("Renaming %s to %s\n"), src, dst);
		if (!show_only && mode != INDEX) {
			if (rename(src, dst) < 0 && !ignore_errors)
				die_errno (_("renaming '%s' failed"), src);
			if (submodule_gitfile[i]) {
				if (submodule_gitfile[i] != SUBMODULE_WITH_GITDIR)
					connect_work_tree_and_git_dir(dst, submodule_gitfile[i]);
				if (!update_path_in_gitmodules(src, dst))
					gitmodules_modified = 1;
			}
		}

		if (mode == WORKING_DIRECTORY)
			continue;

		pos = cache_name_pos(src, strlen(src));
		assert(pos >= 0);
		if (!show_only)
			rename_cache_entry_at(pos, dst);
	}

	if (gitmodules_modified)
		stage_updated_gitmodules();

	if (active_cache_changed) {
		if (write_cache(newfd, active_cache, active_nr) ||
		    commit_locked_index(&lock_file))
			die(_("Unable to write new index file"));
	}

	return 0;
}

//.........这里部分代码省略.........
				n = argc + last - first;
				REALLOC_ARRAY(source, n);
				REALLOC_ARRAY(destination, n);
				REALLOC_ARRAY(modes, n);
				REALLOC_ARRAY(submodule_gitfile, n);

				dst = add_slash(dst);
				dst_len = strlen(dst);

				for (j = 0; j < last - first; j++) {
					const char *path = active_cache[first + j]->name;
					source[argc + j] = path;
					destination[argc + j] =
						prefix_path(dst, dst_len, path + length + 1);
					modes[argc + j] = INDEX;
					submodule_gitfile[argc + j] = NULL;
				}
				argc += last - first;
			}
		} else if (cache_name_pos(src, length) < 0)
			bad = _("not under version control");
		else if (lstat(dst, &st) == 0 &&
			 (!ignore_case || strcasecmp(src, dst))) {
			bad = _("destination exists");
			if (force) {
				/*
				 * only files can overwrite each other:
				 * check both source and destination
				 */
				if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
					if (verbose)
						warning(_("overwriting '%s'"), dst);
					bad = NULL;
				} else
					bad = _("Cannot overwrite");
			}
		} else if (string_list_has_string(&src_for_dst, dst))
			bad = _("multiple sources for the same target");
		else if (is_dir_sep(dst[strlen(dst) - 1]))
			bad = _("destination directory does not exist");
		else
			string_list_insert(&src_for_dst, dst);

		if (!bad)
			continue;
		if (!ignore_errors)
			die(_("%s, source=%s, destination=%s"),
			     bad, src, dst);
		if (--argc > 0) {
			int n = argc - i;
			memmove(source + i, source + i + 1,
				n * sizeof(char *));
			memmove(destination + i, destination + i + 1,
				n * sizeof(char *));
			memmove(modes + i, modes + i + 1,
				n * sizeof(enum update_mode));
			memmove(submodule_gitfile + i, submodule_gitfile + i + 1,
				n * sizeof(char *));
			i--;
		}
	}

	for (i = 0; i < argc; i++) {
		const char *src = source[i], *dst = destination[i];
		enum update_mode mode = modes[i];
		int pos;
		if (show_only || verbose)
			printf(_("Renaming %s to %s\n"), src, dst);
		if (show_only)
			continue;
		if (mode != INDEX && rename(src, dst) < 0) {
			if (ignore_errors)
				continue;
			die_errno(_("renaming '%s' failed"), src);
		}
		if (submodule_gitfile[i]) {
			if (submodule_gitfile[i] != SUBMODULE_WITH_GITDIR)
				connect_work_tree_and_git_dir(dst, submodule_gitfile[i]);
			if (!update_path_in_gitmodules(src, dst))
				gitmodules_modified = 1;
		}

		if (mode == WORKING_DIRECTORY)
			continue;

		pos = cache_name_pos(src, strlen(src));
		assert(pos >= 0);
		if (!show_only)
			rename_cache_entry_at(pos, dst);
	}

	if (gitmodules_modified)
		stage_updated_gitmodules();

	if (active_cache_changed &&
	    write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
		die(_("Unable to write new index file"));

	return 0;
}

static int handle_alias(int *argcp, const char ***argv)
{
	int envchanged = 0, ret = 0, saved_errno = errno;
	const char *subdir;
	int count, option_count;
	const char **new_argv;
	const char *alias_command;
	char *alias_string;
	int unused_nongit;

	subdir = setup_git_directory_gently(&unused_nongit);

	alias_command = (*argv)[0];
	alias_string = alias_lookup(alias_command);
	if (alias_string) {
		if (alias_string[0] == '!') {
			commit_pager_choice();
			if (*argcp > 1) {
				struct strbuf buf;

				strbuf_init(&buf, PATH_MAX);
				strbuf_addstr(&buf, alias_string);
				sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
				free(alias_string);
				alias_string = buf.buf;
			}
			trace_printf("trace: alias to shell cmd: %s => %s\n",
				     alias_command, alias_string + 1);
			ret = system(alias_string + 1);
			if (ret >= 0 && WIFEXITED(ret) &&
			    WEXITSTATUS(ret) != 127)
				exit(WEXITSTATUS(ret));
			die("Failed to run '%s' when expanding alias '%s'",
			    alias_string + 1, alias_command);
		}
		count = split_cmdline(alias_string, &new_argv);
		if (count < 0)
			die("Bad alias.%s string: %s", alias_command,
			    split_cmdline_strerror(count));
		option_count = handle_options(&new_argv, &count, &envchanged);
		if (envchanged)
			die("alias '%s' changes environment variables\n"
				 "You can use '!git' in the alias to do this.",
				 alias_command);
		memmove(new_argv - option_count, new_argv,
				count * sizeof(char *));
		new_argv -= option_count;

		if (count < 1)
			die("empty alias for %s", alias_command);

		if (!strcmp(alias_command, new_argv[0]))
			die("recursive alias: %s", alias_command);

		trace_argv_printf(new_argv,
				  "trace: alias expansion: %s =>",
				  alias_command);

		new_argv = xrealloc(new_argv, sizeof(char *) *
				    (count + *argcp));
		/* insert after command name */
		memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);

		*argv = new_argv;
		*argcp += count - 1;

		ret = 1;
	}

	if (subdir && chdir(subdir))
		die_errno("Cannot change to '%s'", subdir);

	errno = saved_errno;

	return ret;
}

//.........这里部分代码省略.........
				usage(git_usage_string);
			}
			setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
			if (envchanged)
				*envchanged = 1;
			(*argv)++;
			(*argc)--;
		} else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
			setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "--super-prefix")) {
			if (*argc < 2) {
				fprintf(stderr, _("no prefix given for --super-prefix\n" ));
				usage(git_usage_string);
			}
			setenv(GIT_SUPER_PREFIX_ENVIRONMENT, (*argv)[1], 1);
			if (envchanged)
				*envchanged = 1;
			(*argv)++;
			(*argc)--;
		} else if (skip_prefix(cmd, "--super-prefix=", &cmd)) {
			setenv(GIT_SUPER_PREFIX_ENVIRONMENT, cmd, 1);
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "--bare")) {
			char *cwd = xgetcwd();
			is_bare_repository_cfg = 1;
			setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
			free(cwd);
			setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "-c")) {
			if (*argc < 2) {
				fprintf(stderr, _("-c expects a configuration string\n" ));
				usage(git_usage_string);
			}
			git_config_push_parameter((*argv)[1]);
			(*argv)++;
			(*argc)--;
		} else if (!strcmp(cmd, "--literal-pathspecs")) {
			setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "--no-literal-pathspecs")) {
			setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "--glob-pathspecs")) {
			setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "--noglob-pathspecs")) {
			setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "--icase-pathspecs")) {
			setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "--no-optional-locks")) {
			setenv(GIT_OPTIONAL_LOCKS_ENVIRONMENT, "0", 1);
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "--shallow-file")) {
			(*argv)++;
			(*argc)--;
			set_alternate_shallow_file((*argv)[0], 1);
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "-C")) {
			if (*argc < 2) {
				fprintf(stderr, _("no directory given for -C\n" ));
				usage(git_usage_string);
			}
			if ((*argv)[1][0]) {
				if (chdir((*argv)[1]))
					die_errno("cannot change to '%s'", (*argv)[1]);
				if (envchanged)
					*envchanged = 1;
			}
			(*argv)++;
			(*argc)--;
		} else if (!strcmp(cmd, "--list-builtins")) {
			list_builtins(0, '\n');
			exit(0);
		} else if (!strcmp(cmd, "--list-parseopt-builtins")) {
			list_builtins(NO_PARSEOPT, ' ');
			exit(0);
		} else {
			fprintf(stderr, _("unknown option: %s\n"), cmd);
			usage(git_usage_string);
		}

		(*argv)++;
		(*argc)--;
	}
	return (*argv) - orig_argv;
}

static int handle_alias(int *argcp, const char ***argv)
{
	int envchanged = 0, ret = 0, saved_errno = errno;
	int count, option_count;
	const char **new_argv;
	const char *alias_command;
	char *alias_string;

	alias_command = (*argv)[0];
	alias_string = alias_lookup(alias_command);
	if (alias_string) {
		if (alias_string[0] == '!') {
			struct child_process child = CHILD_PROCESS_INIT;
			int nongit_ok;

			/* Aliases expect GIT_PREFIX, GIT_DIR etc to be set */
			setup_git_directory_gently(&nongit_ok);

			commit_pager_choice();

			child.use_shell = 1;
			argv_array_push(&child.args, alias_string + 1);
			argv_array_pushv(&child.args, (*argv) + 1);

			ret = run_command(&child);
			if (ret >= 0)   /* normal exit */
				exit(ret);

			die_errno("while expanding alias '%s': '%s'",
			    alias_command, alias_string + 1);
		}
		count = split_cmdline(alias_string, &new_argv);
		if (count < 0)
			die("Bad alias.%s string: %s", alias_command,
			    split_cmdline_strerror(count));
		option_count = handle_options(&new_argv, &count, &envchanged);
		if (envchanged)
			die("alias '%s' changes environment variables.\n"
				 "You can use '!git' in the alias to do this",
				 alias_command);
		memmove(new_argv - option_count, new_argv,
				count * sizeof(char *));
		new_argv -= option_count;

		if (count < 1)
			die("empty alias for %s", alias_command);

		if (!strcmp(alias_command, new_argv[0]))
			die("recursive alias: %s", alias_command);

		trace_argv_printf(new_argv,
				  "trace: alias expansion: %s =>",
				  alias_command);

		REALLOC_ARRAY(new_argv, count + *argcp);
		/* insert after command name */
		memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);

		*argv = new_argv;
		*argcp += count - 1;

		ret = 1;
	}

	errno = saved_errno;

	return ret;
}

//.........这里部分代码省略.........
	if (argc > 1)
		die (_("unrecognized argument: %s"), argv[1]);

	if (rev.diffopt.output_format & DIFF_FORMAT_NAME)
		die(_("--name-only does not make sense"));
	if (rev.diffopt.output_format & DIFF_FORMAT_NAME_STATUS)
		die(_("--name-status does not make sense"));
	if (rev.diffopt.output_format & DIFF_FORMAT_CHECKDIFF)
		die(_("--check does not make sense"));

	if (!use_patch_format &&
		(!rev.diffopt.output_format ||
		 rev.diffopt.output_format == DIFF_FORMAT_PATCH))
		rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY;

	/* Always generate a patch */
	rev.diffopt.output_format |= DIFF_FORMAT_PATCH;

	if (!DIFF_OPT_TST(&rev.diffopt, TEXT) && !no_binary_diff)
		DIFF_OPT_SET(&rev.diffopt, BINARY);

	if (rev.show_notes)
		init_display_notes(&rev.notes_opt);

	if (!use_stdout)
		output_directory = set_outdir(prefix, output_directory);
	else
		setup_pager();

	if (output_directory) {
		if (use_stdout)
			die(_("standard output, or directory, which one?"));
		if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
			die_errno(_("Could not create directory '%s'"),
				  output_directory);
	}

	if (rev.pending.nr == 1) {
		if (rev.max_count < 0 && !rev.show_root_diff) {
			/*
			 * This is traditional behaviour of "git format-patch
			 * origin" that prepares what the origin side still
			 * does not have.
			 */
			unsigned char sha1[20];
			const char *ref;

			rev.pending.objects[0].item->flags |= UNINTERESTING;
			add_head_to_pending(&rev);
			ref = resolve_ref_unsafe("HEAD", sha1, 1, NULL);
			if (ref && !prefixcmp(ref, "refs/heads/"))
				branch_name = xstrdup(ref + strlen("refs/heads/"));
			else
				branch_name = xstrdup(""); /* no branch */
		}
		/*
		 * Otherwise, it is "format-patch -22 HEAD", and/or
		 * "format-patch --root HEAD".  The user wants
		 * get_revision() to do the usual traversal.
		 */
	}

	/*
	 * We cannot move this anywhere earlier because we do want to
	 * know if --root was given explicitly from the command line.
	 */

static void create_note(const unsigned char *object, struct msg_arg *msg,
			int append_only, const unsigned char *prev,
			unsigned char *result)
{
	char *path = NULL;

	if (msg->use_editor || !msg->given) {
		int fd;

		/* write the template message before editing: */
		path = git_pathdup("NOTES_EDITMSG");
		fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
		if (fd < 0)
			die_errno("could not create file '%s'", path);

		if (msg->given)
			write_or_die(fd, msg->buf.buf, msg->buf.len);
		else if (prev && !append_only)
			write_note_data(fd, prev);
		write_or_die(fd, note_template, strlen(note_template));

		write_commented_object(fd, object);

		close(fd);
		strbuf_reset(&(msg->buf));

		if (launch_editor(path, &(msg->buf), NULL)) {
			die("Please supply the note contents using either -m" \
			    " or -F option");
		}
		stripspace(&(msg->buf), 1);
	}

	if (prev && append_only) {
		/* Append buf to previous note contents */
		unsigned long size;
		enum object_type type;
		char *prev_buf = read_sha1_file(prev, &type, &size);

		strbuf_grow(&(msg->buf), size + 1);
		if (msg->buf.len && prev_buf && size)
			strbuf_insert(&(msg->buf), 0, "\n", 1);
		if (prev_buf && size)
			strbuf_insert(&(msg->buf), 0, prev_buf, size);
		free(prev_buf);
	}

	if (!msg->buf.len) {
		fprintf(stderr, "Removing note for object %s\n",
			sha1_to_hex(object));
		hashclr(result);
	} else {
		if (write_sha1_file(msg->buf.buf, msg->buf.len, blob_type, result)) {
			error("unable to write note object");
			if (path)
				error("The note contents has been left in %s",
				      path);
			exit(128);
		}
	}

	if (path) {
		unlink_or_warn(path);
		free(path);
	}
}

void create_branch(const char *head,
		   const char *name, const char *start_name,
		   int force, int reflog, int clobber_head,
		   int quiet, enum branch_track track)
{
	struct ref_lock *lock = NULL;
	struct commit *commit;
	unsigned char sha1[20];
	char *real_ref, msg[PATH_MAX + 20];
	struct strbuf ref = STRBUF_INIT;
	int forcing = 0;
	int dont_change_ref = 0;
	int explicit_tracking = 0;

	if (track == BRANCH_TRACK_EXPLICIT || track == BRANCH_TRACK_OVERRIDE)
		explicit_tracking = 1;

	if (validate_new_branchname(name, &ref, force,
				    track == BRANCH_TRACK_OVERRIDE ||
				    clobber_head)) {
		if (!force)
			dont_change_ref = 1;
		else
			forcing = 1;
	}

	real_ref = NULL;
	if (get_sha1(start_name, sha1)) {
		if (explicit_tracking) {
			if (advice_set_upstream_failure) {
				error(_(upstream_missing), start_name);
				advise(_(upstream_advice));
				exit(1);
			}
			die(_(upstream_missing), start_name);
		}
		die(_("Not a valid object name: '%s'."), start_name);
	}

	switch (dwim_ref(start_name, strlen(start_name), sha1, &real_ref)) {
	case 0:
		/* Not branching from any existing branch */
		if (explicit_tracking)
			die(_(upstream_not_branch), start_name);
		break;
	case 1:
		/* Unique completion -- good, only if it is a real branch */
		if (!starts_with(real_ref, "refs/heads/") &&
		    validate_remote_tracking_branch(real_ref)) {
			if (explicit_tracking)
				die(_(upstream_not_branch), start_name);
			else
				real_ref = NULL;
		}
		break;
	default:
		die(_("Ambiguous object name: '%s'."), start_name);
		break;
	}

	if ((commit = lookup_commit_reference(sha1)) == NULL)
		die(_("Not a valid branch point: '%s'."), start_name);
	hashcpy(sha1, commit->object.sha1);

	if (!dont_change_ref) {
		lock = lock_any_ref_for_update(ref.buf, NULL, 0, NULL);
		if (!lock)
			die_errno(_("Failed to lock ref for update"));
	}

	if (reflog)
		log_all_ref_updates = 1;

	if (forcing)
		snprintf(msg, sizeof msg, "branch: Reset to %s",
			 start_name);
	else if (!dont_change_ref)
		snprintf(msg, sizeof msg, "branch: Created from %s",
			 start_name);

	if (real_ref && track)
		setup_tracking(ref.buf + 11, real_ref, track, quiet);

	if (!dont_change_ref)
		if (write_ref_sha1(lock, sha1, msg) < 0)
			die_errno(_("Failed to write ref"));

	strbuf_release(&ref);
	free(real_ref);
}

/*
 * Make a pack stream and spit it out into file descriptor fd
 */
static int pack_objects(int fd, struct ref *refs, struct extra_have_objects *extra, struct send_pack_args *args)
{
	/*
	 * The child becomes pack-objects --revs; we feed
	 * the revision parameters to it via its stdin and
	 * let its stdout go back to the other end.
	 */
	const char *argv[] = {
		"pack-objects",
		"--all-progress-implied",
		"--revs",
		"--stdout",
		NULL,
		NULL,
		NULL,
		NULL,
		NULL,
	};
	struct child_process po;
	int i;

	i = 4;
	if (args->use_thin_pack)
		argv[i++] = "--thin";
	if (args->use_ofs_delta)
		argv[i++] = "--delta-base-offset";
	if (args->quiet || !args->progress)
		argv[i++] = "-q";
	if (args->progress)
		argv[i++] = "--progress";
	memset(&po, 0, sizeof(po));
	po.argv = argv;
	po.in = -1;
	po.out = args->stateless_rpc ? -1 : fd;
	po.git_cmd = 1;
	if (start_command(&po))
		die_errno("git pack-objects failed");

	/*
	 * We feed the pack-objects we just spawned with revision
	 * parameters by writing to the pipe.
	 */
	for (i = 0; i < extra->nr; i++)
		if (!feed_object(extra->array[i], po.in, 1))
			break;

	while (refs) {
		if (!is_null_sha1(refs->old_sha1) &&
		    !feed_object(refs->old_sha1, po.in, 1))
			break;
		if (!is_null_sha1(refs->new_sha1) &&
		    !feed_object(refs->new_sha1, po.in, 0))
			break;
		refs = refs->next;
	}

	close(po.in);

	if (args->stateless_rpc) {
		char *buf = xmalloc(LARGE_PACKET_MAX);
		while (1) {
			ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
			if (n <= 0)
				break;
			send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
		}
		free(buf);
		close(po.out);
		po.out = -1;
	}

	if (finish_command(&po))
		return -1;
	return 0;
}

int cmd_stash(int argc, const char **argv, const char *prefix)
{
	int i = -1;
	pid_t pid = getpid();
	const char *index_file;
	struct argv_array args = ARGV_ARRAY_INIT;

	struct option options[] = {
		OPT_END()
	};

	if (!use_builtin_stash()) {
		const char *path = mkpath("%s/git-legacy-stash",
					  git_exec_path());

		if (sane_execvp(path, (char **)argv) < 0)
			die_errno(_("could not exec %s"), path);
		else
			BUG("sane_execvp() returned???");
	}

	prefix = setup_git_directory();
	trace_repo_setup(prefix);
	setup_work_tree();

	git_config(git_diff_basic_config, NULL);

	argc = parse_options(argc, argv, prefix, options, git_stash_usage,
			     PARSE_OPT_KEEP_UNKNOWN | PARSE_OPT_KEEP_DASHDASH);

	index_file = get_index_file();
	strbuf_addf(&stash_index_path, "%s.stash.%" PRIuMAX, index_file,
		    (uintmax_t)pid);

	if (!argc)
		return !!push_stash(0, NULL, prefix);
	else if (!strcmp(argv[0], "apply"))
		return !!apply_stash(argc, argv, prefix);
	else if (!strcmp(argv[0], "clear"))
		return !!clear_stash(argc, argv, prefix);
	else if (!strcmp(argv[0], "drop"))
		return !!drop_stash(argc, argv, prefix);
	else if (!strcmp(argv[0], "pop"))
		return !!pop_stash(argc, argv, prefix);
	else if (!strcmp(argv[0], "branch"))
		return !!branch_stash(argc, argv, prefix);
	else if (!strcmp(argv[0], "list"))
		return !!list_stash(argc, argv, prefix);
	else if (!strcmp(argv[0], "show"))
		return !!show_stash(argc, argv, prefix);
	else if (!strcmp(argv[0], "store"))
		return !!store_stash(argc, argv, prefix);
	else if (!strcmp(argv[0], "create"))
		return !!create_stash(argc, argv, prefix);
	else if (!strcmp(argv[0], "push"))
		return !!push_stash(argc, argv, prefix);
	else if (!strcmp(argv[0], "save"))
		return !!save_stash(argc, argv, prefix);
	else if (*argv[0] != '-')
		usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
			      git_stash_usage, options);

	if (strcmp(argv[0], "-p")) {
		while (++i < argc && strcmp(argv[i], "--")) {
			/*
			 * `akpqu` is a string which contains all short options,
			 * except `-m` which is verified separately.
			 */
			if ((strlen(argv[i]) == 2) && *argv[i] == '-' &&
			    strchr("