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  • config.c 37.17 KiB
    /*
     * GIT - The information manager from hell
     *
     * Copyright (C) Linus Torvalds, 2005
     * Copyright (C) Johannes Schindelin, 2005
     *
     */
    #include "cache.h"
    #include "exec_cmd.h"
    #include "strbuf.h"
    #include "quote.h"
    
    #define MAXNAME (256)
    
    typedef struct config_file {
    	struct config_file *prev;
    	FILE *f;
    	const char *name;
    	int linenr;
    	int eof;
    	struct strbuf value;
    	char var[MAXNAME];
    } config_file;
    
    static config_file *cf;
    
    static int zlib_compression_seen;
    
    #define MAX_INCLUDE_DEPTH 10
    static const char include_depth_advice[] =
    "exceeded maximum include depth (%d) while including\n"
    "	%s\n"
    "from\n"
    "	%s\n"
    "Do you have circular includes?";
    static int handle_path_include(const char *path, struct config_include_data *inc)
    {
    	int ret = 0;
    	struct strbuf buf = STRBUF_INIT;
    
    	/*
    	 * Use an absolute path as-is, but interpret relative paths
    	 * based on the including config file.
    	 */
    	if (!is_absolute_path(path)) {
    		char *slash;
    
    		if (!cf || !cf->name)
    			return error("relative config includes must come from files");
    
    		slash = find_last_dir_sep(cf->name);
    		if (slash)
    			strbuf_add(&buf, cf->name, slash - cf->name + 1);
    		strbuf_addstr(&buf, path);
    		path = buf.buf;
    	}
    
    	if (!access(path, R_OK)) {
    		if (++inc->depth > MAX_INCLUDE_DEPTH)
    			die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
    			    cf && cf->name ? cf->name : "the command line");
    		ret = git_config_from_file(git_config_include, path, inc);
    		inc->depth--;
    	}
    	strbuf_release(&buf);
    	return ret;
    }
    
    int git_config_include(const char *var, const char *value, void *data)
    {
    	struct config_include_data *inc = data;
    	const char *type;
    	int ret;
    
    	/*
    	 * Pass along all values, including "include" directives; this makes it
    	 * possible to query information on the includes themselves.
    	 */
    	ret = inc->fn(var, value, inc->data);
    	if (ret < 0)
    		return ret;
    
    	type = skip_prefix(var, "include.");
    	if (!type)
    		return ret;
    
    	if (!strcmp(type, "path"))
    		ret = handle_path_include(value, inc);
    	return ret;
    }
    
    static void lowercase(char *p)
    {
    	for (; *p; p++)
    		*p = tolower(*p);
    }
    
    void git_config_push_parameter(const char *text)
    {
    	struct strbuf env = STRBUF_INIT;
    	const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
    	if (old) {
    		strbuf_addstr(&env, old);
    		strbuf_addch(&env, ' ');
    	}
    	sq_quote_buf(&env, text);
    	setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
    	strbuf_release(&env);
    }
    
    int git_config_parse_parameter(const char *text,
    			       config_fn_t fn, void *data)
    {
    	struct strbuf **pair;
    	pair = strbuf_split_str(text, '=', 2);
    	if (!pair[0])
    		return error("bogus config parameter: %s", text);
    	if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
    		strbuf_setlen(pair[0], pair[0]->len - 1);
    	strbuf_trim(pair[0]);
    	if (!pair[0]->len) {
    		strbuf_list_free(pair);
    		return error("bogus config parameter: %s", text);
    	}
    	lowercase(pair[0]->buf);
    	if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
    		strbuf_list_free(pair);
    		return -1;
    	}
    	strbuf_list_free(pair);
    	return 0;
    }
    
    int git_config_from_parameters(config_fn_t fn, void *data)
    {
    	const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
    	char *envw;
    	const char **argv = NULL;
    	int nr = 0, alloc = 0;
    	int i;
    
    	if (!env)
    		return 0;
    	/* sq_dequote will write over it */
    	envw = xstrdup(env);
    
    	if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
    		free(envw);
    		return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
    	}
    
    	for (i = 0; i < nr; i++) {
    		if (git_config_parse_parameter(argv[i], fn, data) < 0) {
    			free(argv);
    			free(envw);
    			return -1;
    		}
    	}
    
    	free(argv);
    	free(envw);
    	return nr > 0;
    }
    
    static int get_next_char(void)
    {
    	int c;
    	FILE *f;
    
    	c = '\n';
    	if (cf && ((f = cf->f) != NULL)) {
    		c = fgetc(f);
    		if (c == '\r') {
    			/* DOS like systems */
    			c = fgetc(f);
    			if (c != '\n') {
    				ungetc(c, f);
    				c = '\r';
    			}
    		}
    		if (c == '\n')
    			cf->linenr++;
    		if (c == EOF) {
    			cf->eof = 1;
    			c = '\n';
    		}
    	}
    	return c;
    }
    
    static char *parse_value(void)
    {
    	int quote = 0, comment = 0, space = 0;
    
    	strbuf_reset(&cf->value);
    	for (;;) {
    		int c = get_next_char();
    		if (c == '\n') {
    			if (quote)
    				return NULL;
    			return cf->value.buf;
    		}
    		if (comment)
    			continue;
    		if (isspace(c) && !quote) {
    			if (cf->value.len)
    				space++;
    			continue;
    		}
    		if (!quote) {
    			if (c == ';' || c == '#') {
    				comment = 1;
    				continue;
    			}
    		}
    		for (; space; space--)
    			strbuf_addch(&cf->value, ' ');
    		if (c == '\\') {
    			c = get_next_char();
    			switch (c) {
    			case '\n':
    				continue;
    			case 't':
    				c = '\t';
    				break;
    			case 'b':
    				c = '\b';
    				break;
    			case 'n':
    				c = '\n';
    				break;
    			/* Some characters escape as themselves */
    			case '\\': case '"':
    				break;
    			/* Reject unknown escape sequences */
    			default:
    				return NULL;
    			}
    			strbuf_addch(&cf->value, c);
    			continue;
    		}
    		if (c == '"') {
    			quote = 1-quote;
    			continue;
    		}
    		strbuf_addch(&cf->value, c);
    	}
    }
    
    static inline int iskeychar(int c)
    {
    	return isalnum(c) || c == '-';
    }
    
    static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
    {
    	int c;
    	char *value;
    
    	/* Get the full name */
    	for (;;) {
    		c = get_next_char();
    		if (cf->eof)
    			break;
    		if (!iskeychar(c))
    			break;
    		name[len++] = tolower(c);
    		if (len >= MAXNAME)
    			return -1;
    	}
    	name[len] = 0;
    	while (c == ' ' || c == '\t')
    		c = get_next_char();
    
    	value = NULL;
    	if (c != '\n') {
    		if (c != '=')
    			return -1;
    		value = parse_value();
    		if (!value)
    			return -1;
    	}
    	return fn(name, value, data);
    }
    
    static int get_extended_base_var(char *name, int baselen, int c)
    {
    	do {
    		if (c == '\n')
    			return -1;
    		c = get_next_char();
    	} while (isspace(c));
    
    	/* We require the format to be '[base "extension"]' */
    	if (c != '"')
    		return -1;
    	name[baselen++] = '.';
    
    	for (;;) {
    		int c = get_next_char();
    		if (c == '\n')
    			return -1;
    		if (c == '"')
    			break;
    		if (c == '\\') {
    			c = get_next_char();
    			if (c == '\n')
    				return -1;
    		}
    		name[baselen++] = c;
    		if (baselen > MAXNAME / 2)
    			return -1;
    	}
    
    	/* Final ']' */
    	if (get_next_char() != ']')
    		return -1;
    	return baselen;
    }
    
    static int get_base_var(char *name)
    {
    	int baselen = 0;
    
    	for (;;) {
    		int c = get_next_char();
    		if (cf->eof)
    			return -1;
    		if (c == ']')
    			return baselen;
    		if (isspace(c))
    			return get_extended_base_var(name, baselen, c);
    		if (!iskeychar(c) && c != '.')
    			return -1;
    		if (baselen > MAXNAME / 2)
    			return -1;
    		name[baselen++] = tolower(c);
    	}
    }
    
    static int git_parse_file(config_fn_t fn, void *data)
    {
    	int comment = 0;
    	int baselen = 0;
    	char *var = cf->var;
    
    	/* U+FEFF Byte Order Mark in UTF8 */
    	static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
    	const unsigned char *bomptr = utf8_bom;
    
    	for (;;) {
    		int c = get_next_char();
    		if (bomptr && *bomptr) {
    			/* We are at the file beginning; skip UTF8-encoded BOM
    			 * if present. Sane editors won't put this in on their
    			 * own, but e.g. Windows Notepad will do it happily. */
    			if ((unsigned char) c == *bomptr) {
    				bomptr++;
    				continue;
    			} else {
    				/* Do not tolerate partial BOM. */
    				if (bomptr != utf8_bom)
    					break;
    				/* No BOM at file beginning. Cool. */
    				bomptr = NULL;
    			}
    		}
    		if (c == '\n') {
    			if (cf->eof)
    				return 0;
    			comment = 0;
    			continue;
    		}
    		if (comment || isspace(c))
    			continue;
    		if (c == '#' || c == ';') {
    			comment = 1;
    			continue;
    		}
    		if (c == '[') {
    			baselen = get_base_var(var);
    			if (baselen <= 0)
    				break;
    			var[baselen++] = '.';
    			var[baselen] = 0;
    			continue;
    		}
    		if (!isalpha(c))
    			break;
    		var[baselen] = tolower(c);
    		if (get_value(fn, data, var, baselen+1) < 0)
    			break;
    	}
    	die("bad config file line %d in %s", cf->linenr, cf->name);
    }
    
    static int parse_unit_factor(const char *end, uintmax_t *val)
    {
    	if (!*end)
    		return 1;
    	else if (!strcasecmp(end, "k")) {
    		*val *= 1024;
    		return 1;
    	}
    	else if (!strcasecmp(end, "m")) {
    		*val *= 1024 * 1024;
    		return 1;
    	}
    	else if (!strcasecmp(end, "g")) {
    		*val *= 1024 * 1024 * 1024;
    		return 1;
    	}
    	return 0;
    }
    
    static int git_parse_long(const char *value, long *ret)
    {
    	if (value && *value) {
    		char *end;
    		intmax_t val;
    		uintmax_t uval;
    		uintmax_t factor = 1;
    
    		errno = 0;
    		val = strtoimax(value, &end, 0);
    		if (errno == ERANGE)
    			return 0;
    		if (!parse_unit_factor(end, &factor))
    			return 0;
    		uval = abs(val);
    		uval *= factor;
    		if ((uval > maximum_signed_value_of_type(long)) ||
    		    (abs(val) > uval))
    			return 0;
    		val *= factor;
    		*ret = val;
    		return 1;
    	}
    	return 0;
    }
    
    int git_parse_ulong(const char *value, unsigned long *ret)
    {
    	if (value && *value) {
    		char *end;
    		uintmax_t val;
    		uintmax_t oldval;
    
    		errno = 0;
    		val = strtoumax(value, &end, 0);
    		if (errno == ERANGE)
    			return 0;
    		oldval = val;
    		if (!parse_unit_factor(end, &val))
    			return 0;
    		if ((val > maximum_unsigned_value_of_type(long)) ||
    		    (oldval > val))
    			return 0;
    		*ret = val;
    		return 1;
    	}
    	return 0;
    }
    
    static void die_bad_config(const char *name)
    {
    	if (cf && cf->name)
    		die("bad config value for '%s' in %s", name, cf->name);
    	die("bad config value for '%s'", name);
    }
    
    int git_config_int(const char *name, const char *value)
    {
    	long ret = 0;
    	if (!git_parse_long(value, &ret))
    		die_bad_config(name);
    	return ret;
    }
    
    unsigned long git_config_ulong(const char *name, const char *value)
    {
    	unsigned long ret;
    	if (!git_parse_ulong(value, &ret))
    		die_bad_config(name);
    	return ret;
    }
    
    static int git_config_maybe_bool_text(const char *name, const char *value)
    {
    	if (!value)
    		return 1;
    	if (!*value)
    		return 0;
    	if (!strcasecmp(value, "true")
    	    || !strcasecmp(value, "yes")
    	    || !strcasecmp(value, "on"))
    		return 1;
    	if (!strcasecmp(value, "false")
    	    || !strcasecmp(value, "no")
    	    || !strcasecmp(value, "off"))
    		return 0;
    	return -1;
    }
    
    int git_config_maybe_bool(const char *name, const char *value)
    {
    	long v = git_config_maybe_bool_text(name, value);
    	if (0 <= v)
    		return v;
    	if (git_parse_long(value, &v))
    		return !!v;
    	return -1;
    }
    
    int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
    {
    	int v = git_config_maybe_bool_text(name, value);
    	if (0 <= v) {
    		*is_bool = 1;
    		return v;
    	}
    	*is_bool = 0;
    	return git_config_int(name, value);
    }
    
    int git_config_bool(const char *name, const char *value)
    {
    	int discard;
    	return !!git_config_bool_or_int(name, value, &discard);
    }
    
    int git_config_string(const char **dest, const char *var, const char *value)
    {
    	if (!value)
    		return config_error_nonbool(var);
    	*dest = xstrdup(value);
    	return 0;
    }
    
    int git_config_pathname(const char **dest, const char *var, const char *value)
    {
    	if (!value)
    		return config_error_nonbool(var);
    	*dest = expand_user_path(value);
    	if (!*dest)
    		die("Failed to expand user dir in: '%s'", value);
    	return 0;
    }
    
    static int git_default_core_config(const char *var, const char *value)
    {
    	/* This needs a better name */
    	if (!strcmp(var, "core.filemode")) {
    		trust_executable_bit = git_config_bool(var, value);
    		return 0;
    	}
    	if (!strcmp(var, "core.trustctime")) {
    		trust_ctime = git_config_bool(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.quotepath")) {
    		quote_path_fully = git_config_bool(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.symlinks")) {
    		has_symlinks = git_config_bool(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.ignorecase")) {
    		ignore_case = git_config_bool(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.attributesfile"))
    		return git_config_pathname(&git_attributes_file, var, value);
    
    	if (!strcmp(var, "core.bare")) {
    		is_bare_repository_cfg = git_config_bool(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.ignorestat")) {
    		assume_unchanged = git_config_bool(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.prefersymlinkrefs")) {
    		prefer_symlink_refs = git_config_bool(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.logallrefupdates")) {
    		log_all_ref_updates = git_config_bool(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.warnambiguousrefs")) {
    		warn_ambiguous_refs = git_config_bool(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.abbrev")) {
    		int abbrev = git_config_int(var, value);
    		if (abbrev < minimum_abbrev || abbrev > 40)
    			return -1;
    		default_abbrev = abbrev;
    		return 0;
    	}
    
    	if (!strcmp(var, "core.loosecompression")) {
    		int level = git_config_int(var, value);
    		if (level == -1)
    			level = Z_DEFAULT_COMPRESSION;
    		else if (level < 0 || level > Z_BEST_COMPRESSION)
    			die("bad zlib compression level %d", level);
    		zlib_compression_level = level;
    		zlib_compression_seen = 1;
    		return 0;
    	}
    
    	if (!strcmp(var, "core.compression")) {
    		int level = git_config_int(var, value);
    		if (level == -1)
    			level = Z_DEFAULT_COMPRESSION;
    		else if (level < 0 || level > Z_BEST_COMPRESSION)
    			die("bad zlib compression level %d", level);
    		core_compression_level = level;
    		core_compression_seen = 1;
    		if (!zlib_compression_seen)
    			zlib_compression_level = level;
    		return 0;
    	}
    
    	if (!strcmp(var, "core.packedgitwindowsize")) {
    		int pgsz_x2 = getpagesize() * 2;
    		packed_git_window_size = git_config_ulong(var, value);
    
    		/* This value must be multiple of (pagesize * 2) */
    		packed_git_window_size /= pgsz_x2;
    		if (packed_git_window_size < 1)
    			packed_git_window_size = 1;
    		packed_git_window_size *= pgsz_x2;
    		return 0;
    	}
    
    	if (!strcmp(var, "core.bigfilethreshold")) {
    		big_file_threshold = git_config_ulong(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.packedgitlimit")) {
    		packed_git_limit = git_config_ulong(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.deltabasecachelimit")) {
    		delta_base_cache_limit = git_config_ulong(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.logpackaccess"))
    		return git_config_string(&log_pack_access, var, value);
    
    	if (!strcmp(var, "core.autocrlf")) {
    		if (value && !strcasecmp(value, "input")) {
    			if (core_eol == EOL_CRLF)
    				return error("core.autocrlf=input conflicts with core.eol=crlf");
    			auto_crlf = AUTO_CRLF_INPUT;
    			return 0;
    		}
    		auto_crlf = git_config_bool(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.safecrlf")) {
    		if (value && !strcasecmp(value, "warn")) {
    			safe_crlf = SAFE_CRLF_WARN;
    			return 0;
    		}
    		safe_crlf = git_config_bool(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.eol")) {
    		if (value && !strcasecmp(value, "lf"))
    			core_eol = EOL_LF;
    		else if (value && !strcasecmp(value, "crlf"))
    			core_eol = EOL_CRLF;
    		else if (value && !strcasecmp(value, "native"))
    			core_eol = EOL_NATIVE;
    		else
    			core_eol = EOL_UNSET;
    		if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
    			return error("core.autocrlf=input conflicts with core.eol=crlf");
    		return 0;
    	}
    
    	if (!strcmp(var, "core.notesref")) {
    		notes_ref_name = xstrdup(value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.pager"))
    		return git_config_string(&pager_program, var, value);
    
    	if (!strcmp(var, "core.editor"))
    		return git_config_string(&editor_program, var, value);
    
    	if (!strcmp(var, "core.askpass"))
    		return git_config_string(&askpass_program, var, value);
    
    	if (!strcmp(var, "core.excludesfile"))
    		return git_config_pathname(&excludes_file, var, value);
    
    	if (!strcmp(var, "core.whitespace")) {
    		if (!value)
    			return config_error_nonbool(var);
    		whitespace_rule_cfg = parse_whitespace_rule(value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.fsyncobjectfiles")) {
    		fsync_object_files = git_config_bool(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.preloadindex")) {
    		core_preload_index = git_config_bool(var, value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.createobject")) {
    		if (!strcmp(value, "rename"))
    			object_creation_mode = OBJECT_CREATION_USES_RENAMES;
    		else if (!strcmp(value, "link"))
    			object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
    		else
    			die("Invalid mode for object creation: %s", value);
    		return 0;
    	}
    
    	if (!strcmp(var, "core.sparsecheckout")) {
    		core_apply_sparse_checkout = git_config_bool(var, value);
    		return 0;
    	}
    
    	/* Add other config variables here and to Documentation/config.txt. */
    	return 0;
    }
    
    static int git_default_user_config(const char *var, const char *value)
    {
    	if (!strcmp(var, "user.name")) {
    		if (!value)
    			return config_error_nonbool(var);
    		strlcpy(git_default_name, value, sizeof(git_default_name));
    		user_ident_explicitly_given |= IDENT_NAME_GIVEN;
    		return 0;
    	}
    
    	if (!strcmp(var, "user.email")) {
    		if (!value)
    			return config_error_nonbool(var);
    		strlcpy(git_default_email, value, sizeof(git_default_email));
    		user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
    		return 0;
    	}
    
    	/* Add other config variables here and to Documentation/config.txt. */
    	return 0;
    }
    
    static int git_default_i18n_config(const char *var, const char *value)
    {
    	if (!strcmp(var, "i18n.commitencoding"))
    		return git_config_string(&git_commit_encoding, var, value);
    
    	if (!strcmp(var, "i18n.logoutputencoding"))
    		return git_config_string(&git_log_output_encoding, var, value);
    
    	/* Add other config variables here and to Documentation/config.txt. */
    	return 0;
    }
    
    static int git_default_branch_config(const char *var, const char *value)
    {
    	if (!strcmp(var, "branch.autosetupmerge")) {
    		if (value && !strcasecmp(value, "always")) {
    			git_branch_track = BRANCH_TRACK_ALWAYS;
    			return 0;
    		}
    		git_branch_track = git_config_bool(var, value);
    		return 0;
    	}
    	if (!strcmp(var, "branch.autosetuprebase")) {
    		if (!value)
    			return config_error_nonbool(var);
    		else if (!strcmp(value, "never"))
    			autorebase = AUTOREBASE_NEVER;
    		else if (!strcmp(value, "local"))
    			autorebase = AUTOREBASE_LOCAL;
    		else if (!strcmp(value, "remote"))
    			autorebase = AUTOREBASE_REMOTE;
    		else if (!strcmp(value, "always"))
    			autorebase = AUTOREBASE_ALWAYS;
    		else
    			return error("Malformed value for %s", var);
    		return 0;
    	}
    
    	/* Add other config variables here and to Documentation/config.txt. */
    	return 0;
    }
    
    static int git_default_push_config(const char *var, const char *value)
    {
    	if (!strcmp(var, "push.default")) {
    		if (!value)
    			return config_error_nonbool(var);
    		else if (!strcmp(value, "nothing"))
    			push_default = PUSH_DEFAULT_NOTHING;
    		else if (!strcmp(value, "matching"))
    			push_default = PUSH_DEFAULT_MATCHING;
    		else if (!strcmp(value, "upstream"))
    			push_default = PUSH_DEFAULT_UPSTREAM;
    		else if (!strcmp(value, "tracking")) /* deprecated */
    			push_default = PUSH_DEFAULT_UPSTREAM;
    		else if (!strcmp(value, "current"))
    			push_default = PUSH_DEFAULT_CURRENT;
    		else {
    			error("Malformed value for %s: %s", var, value);
    			return error("Must be one of nothing, matching, "
    				     "tracking or current.");
    		}
    		return 0;
    	}
    
    	/* Add other config variables here and to Documentation/config.txt. */
    	return 0;
    }
    
    static int git_default_mailmap_config(const char *var, const char *value)
    {
    	if (!strcmp(var, "mailmap.file"))
    		return git_config_string(&git_mailmap_file, var, value);
    
    	/* Add other config variables here and to Documentation/config.txt. */
    	return 0;
    }
    
    int git_default_config(const char *var, const char *value, void *dummy)
    {
    	if (!prefixcmp(var, "core."))
    		return git_default_core_config(var, value);
    
    	if (!prefixcmp(var, "user."))
    		return git_default_user_config(var, value);
    
    	if (!prefixcmp(var, "i18n."))
    		return git_default_i18n_config(var, value);
    
    	if (!prefixcmp(var, "branch."))
    		return git_default_branch_config(var, value);
    
    	if (!prefixcmp(var, "push."))
    		return git_default_push_config(var, value);
    
    	if (!prefixcmp(var, "mailmap."))
    		return git_default_mailmap_config(var, value);
    
    	if (!prefixcmp(var, "advice."))
    		return git_default_advice_config(var, value);
    
    	if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
    		pager_use_color = git_config_bool(var,value);
    		return 0;
    	}
    
    	if (!strcmp(var, "pack.packsizelimit")) {
    		pack_size_limit_cfg = git_config_ulong(var, value);
    		return 0;
    	}
    	/* Add other config variables here and to Documentation/config.txt. */
    	return 0;
    }
    
    int git_config_from_file(config_fn_t fn, const char *filename, void *data)
    {
    	int ret;
    	FILE *f = fopen(filename, "r");
    
    	ret = -1;
    	if (f) {
    		config_file top;
    
    		/* push config-file parsing state stack */
    		top.prev = cf;
    		top.f = f;
    		top.name = filename;
    		top.linenr = 1;
    		top.eof = 0;
    		strbuf_init(&top.value, 1024);
    		cf = &top;
    
    		ret = git_parse_file(fn, data);
    
    		/* pop config-file parsing state stack */
    		strbuf_release(&top.value);
    		cf = top.prev;
    
    		fclose(f);
    	}
    	return ret;
    }
    
    const char *git_etc_gitconfig(void)
    {
    	static const char *system_wide;
    	if (!system_wide)
    		system_wide = system_path(ETC_GITCONFIG);
    	return system_wide;
    }
    
    int git_env_bool(const char *k, int def)
    {
    	const char *v = getenv(k);
    	return v ? git_config_bool(k, v) : def;
    }
    
    int git_config_system(void)
    {
    	return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
    }
    
    int git_config_early(config_fn_t fn, void *data, const char *repo_config)
    {
    	int ret = 0, found = 0;
    	const char *home = NULL;
    
    	if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
    		ret += git_config_from_file(fn, git_etc_gitconfig(),
    					    data);
    		found += 1;
    	}
    
    	home = getenv("HOME");
    	if (home) {
    		char buf[PATH_MAX];
    		char *user_config = mksnpath(buf, sizeof(buf), "%s/.gitconfig", home);
    		if (!access(user_config, R_OK)) {
    			ret += git_config_from_file(fn, user_config, data);
    			found += 1;
    		}
    	}
    
    	if (repo_config && !access(repo_config, R_OK)) {
    		ret += git_config_from_file(fn, repo_config, data);
    		found += 1;
    	}
    
    	switch (git_config_from_parameters(fn, data)) {
    	case -1: /* error */
    		die("unable to parse command-line config");
    		break;
    	case 0: /* found nothing */
    		break;
    	default: /* found at least one item */
    		found++;
    		break;
    	}
    
    	return ret == 0 ? found : ret;
    }
    
    int git_config_with_options(config_fn_t fn, void *data,
    			    const char *filename, int respect_includes)
    {
    	char *repo_config = NULL;
    	int ret;
    	struct config_include_data inc = CONFIG_INCLUDE_INIT;
    
    	if (respect_includes) {
    		inc.fn = fn;
    		inc.data = data;
    		fn = git_config_include;
    		data = &inc;
    	}
    
    	/*
    	 * If we have a specific filename, use it. Otherwise, follow the
    	 * regular lookup sequence.
    	 */
    	if (filename)
    		return git_config_from_file(fn, filename, data);
    
    	repo_config = git_pathdup("config");
    	ret = git_config_early(fn, data, repo_config);
    	if (repo_config)
    		free(repo_config);
    	return ret;
    }
    
    int git_config(config_fn_t fn, void *data)
    {
    	return git_config_with_options(fn, data, NULL, 1);
    }
    
    /*
     * Find all the stuff for git_config_set() below.
     */
    
    #define MAX_MATCHES 512
    
    static struct {
    	int baselen;
    	char *key;
    	int do_not_match;
    	regex_t *value_regex;
    	int multi_replace;
    	size_t offset[MAX_MATCHES];
    	enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
    	int seen;
    } store;
    
    static int matches(const char *key, const char *value)
    {
    	return !strcmp(key, store.key) &&
    		(store.value_regex == NULL ||
    		 (store.do_not_match ^
    		  !regexec(store.value_regex, value, 0, NULL, 0)));
    }
    
    static int store_aux(const char *key, const char *value, void *cb)
    {
    	const char *ep;
    	size_t section_len;
    	FILE *f = cf->f;
    
    	switch (store.state) {
    	case KEY_SEEN:
    		if (matches(key, value)) {
    			if (store.seen == 1 && store.multi_replace == 0) {
    				warning("%s has multiple values", key);
    			} else if (store.seen >= MAX_MATCHES) {
    				error("too many matches for %s", key);
    				return 1;
    			}
    
    			store.offset[store.seen] = ftell(f);
    			store.seen++;
    		}
    		break;
    	case SECTION_SEEN:
    		/*
    		 * What we are looking for is in store.key (both
    		 * section and var), and its section part is baselen
    		 * long.  We found key (again, both section and var).
    		 * We would want to know if this key is in the same
    		 * section as what we are looking for.  We already
    		 * know we are in the same section as what should
    		 * hold store.key.
    		 */
    		ep = strrchr(key, '.');
    		section_len = ep - key;
    
    		if ((section_len != store.baselen) ||
    		    memcmp(key, store.key, section_len+1)) {
    			store.state = SECTION_END_SEEN;
    			break;
    		}
    
    		/*
    		 * Do not increment matches: this is no match, but we
    		 * just made sure we are in the desired section.
    		 */
    		store.offset[store.seen] = ftell(f);
    		/* fallthru */
    	case SECTION_END_SEEN:
    	case START:
    		if (matches(key, value)) {
    			store.offset[store.seen] = ftell(f);
    			store.state = KEY_SEEN;
    			store.seen++;
    		} else {
    			if (strrchr(key, '.') - key == store.baselen &&
    			      !strncmp(key, store.key, store.baselen)) {
    					store.state = SECTION_SEEN;
    					store.offset[store.seen] = ftell(f);
    			}
    		}
    	}
    	return 0;
    }
    
    static int write_error(const char *filename)
    {
    	error("failed to write new configuration file %s", filename);
    
    	/* Same error code as "failed to rename". */
    	return 4;
    }
    
    static int store_write_section(int fd, const char *key)
    {
    	const char *dot;
    	int i, success;
    	struct strbuf sb = STRBUF_INIT;
    
    	dot = memchr(key, '.', store.baselen);
    	if (dot) {
    		strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
    		for (i = dot - key + 1; i < store.baselen; i++) {
    			if (key[i] == '"' || key[i] == '\\')
    				strbuf_addch(&sb, '\\');
    			strbuf_addch(&sb, key[i]);
    		}
    		strbuf_addstr(&sb, "\"]\n");
    	} else {
    		strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
    	}
    
    	success = write_in_full(fd, sb.buf, sb.len) == sb.len;
    	strbuf_release(&sb);
    
    	return success;
    }
    
    static int store_write_pair(int fd, const char *key, const char *value)
    {
    	int i, success;
    	int length = strlen(key + store.baselen + 1);
    	const char *quote = "";
    	struct strbuf sb = STRBUF_INIT;
    
    	/*
    	 * Check to see if the value needs to be surrounded with a dq pair.
    	 * Note that problematic characters are always backslash-quoted; this
    	 * check is about not losing leading or trailing SP and strings that
    	 * follow beginning-of-comment characters (i.e. ';' and '#') by the
    	 * configuration parser.
    	 */
    	if (value[0] == ' ')
    		quote = "\"";
    	for (i = 0; value[i]; i++)
    		if (value[i] == ';' || value[i] == '#')
    			quote = "\"";
    	if (i && value[i - 1] == ' ')
    		quote = "\"";
    
    	strbuf_addf(&sb, "\t%.*s = %s",
    		    length, key + store.baselen + 1, quote);
    
    	for (i = 0; value[i]; i++)
    		switch (value[i]) {
    		case '\n':
    			strbuf_addstr(&sb, "\\n");
    			break;
    		case '\t':
    			strbuf_addstr(&sb, "\\t");
    			break;
    		case '"':
    		case '\\':
    			strbuf_addch(&sb, '\\');
    		default:
    			strbuf_addch(&sb, value[i]);
    			break;
    		}
    	strbuf_addf(&sb, "%s\n", quote);
    
    	success = write_in_full(fd, sb.buf, sb.len) == sb.len;
    	strbuf_release(&sb);
    
    	return success;
    }
    
    static ssize_t find_beginning_of_line(const char *contents, size_t size,
    	size_t offset_, int *found_bracket)
    {
    	size_t equal_offset = size, bracket_offset = size;
    	ssize_t offset;
    
    contline:
    	for (offset = offset_-2; offset > 0
    			&& contents[offset] != '\n'; offset--)
    		switch (contents[offset]) {
    			case '=': equal_offset = offset; break;
    			case ']': bracket_offset = offset; break;
    		}
    	if (offset > 0 && contents[offset-1] == '\\') {
    		offset_ = offset;
    		goto contline;
    	}
    	if (bracket_offset < equal_offset) {
    		*found_bracket = 1;
    		offset = bracket_offset+1;
    	} else
    		offset++;
    
    	return offset;
    }
    
    int git_config_set_in_file(const char *config_filename,
    			const char *key, const char *value)
    {
    	return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
    }
    
    int git_config_set(const char *key, const char *value)
    {
    	return git_config_set_multivar(key, value, NULL, 0);
    }
    
    /*
     * Auxiliary function to sanity-check and split the key into the section
     * identifier and variable name.
     *
     * Returns 0 on success, -1 when there is an invalid character in the key and
     * -2 if there is no section name in the key.
     *
     * store_key - pointer to char* which will hold a copy of the key with
     *             lowercase section and variable name
     * baselen - pointer to int which will hold the length of the
     *           section + subsection part, can be NULL
     */
    int git_config_parse_key(const char *key, char **store_key, int *baselen_)
    {
    	int i, dot, baselen;
    	const char *last_dot = strrchr(key, '.');
    
    	/*
    	 * Since "key" actually contains the section name and the real
    	 * key name separated by a dot, we have to know where the dot is.
    	 */
    
    	if (last_dot == NULL || last_dot == key) {
    		error("key does not contain a section: %s", key);
    		return -CONFIG_NO_SECTION_OR_NAME;
    	}
    
    	if (!last_dot[1]) {
    		error("key does not contain variable name: %s", key);
    		return -CONFIG_NO_SECTION_OR_NAME;
    	}
    
    	baselen = last_dot - key;
    	if (baselen_)
    		*baselen_ = baselen;
    
    	/*
    	 * Validate the key and while at it, lower case it for matching.
    	 */
    	*store_key = xmalloc(strlen(key) + 1);
    
    	dot = 0;
    	for (i = 0; key[i]; i++) {
    		unsigned char c = key[i];
    		if (c == '.')
    			dot = 1;
    		/* Leave the extended basename untouched.. */
    		if (!dot || i > baselen) {
    			if (!iskeychar(c) ||
    			    (i == baselen + 1 && !isalpha(c))) {
    				error("invalid key: %s", key);
    				goto out_free_ret_1;
    			}
    			c = tolower(c);
    		} else if (c == '\n') {
    			error("invalid key (newline): %s", key);
    			goto out_free_ret_1;
    		}
    		(*store_key)[i] = c;
    	}
    	(*store_key)[i] = 0;
    
    	return 0;
    
    out_free_ret_1:
    	free(*store_key);
    	return -CONFIG_INVALID_KEY;
    }
    
    /*
     * If value==NULL, unset in (remove from) config,
     * if value_regex!=NULL, disregard key/value pairs where value does not match.
     * if multi_replace==0, nothing, or only one matching key/value is replaced,
     *     else all matching key/values (regardless how many) are removed,
     *     before the new pair is written.
     *
     * Returns 0 on success.
     *
     * This function does this:
     *
     * - it locks the config file by creating ".git/config.lock"
     *
     * - it then parses the config using store_aux() as validator to find
     *   the position on the key/value pair to replace. If it is to be unset,
     *   it must be found exactly once.
     *
     * - the config file is mmap()ed and the part before the match (if any) is
     *   written to the lock file, then the changed part and the rest.
     *
     * - the config file is removed and the lock file rename()d to it.
     *
     */
    int git_config_set_multivar_in_file(const char *config_filename,
    				const char *key, const char *value,
    				const char *value_regex, int multi_replace)
    {
    	int fd = -1, in_fd;
    	int ret;
    	struct lock_file *lock = NULL;
    	char *filename_buf = NULL;
    
    	/* parse-key returns negative; flip the sign to feed exit(3) */
    	ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
    	if (ret)
    		goto out_free;
    
    	store.multi_replace = multi_replace;
    
    	if (!config_filename)
    		config_filename = filename_buf = git_pathdup("config");
    
    	/*
    	 * The lock serves a purpose in addition to locking: the new
    	 * contents of .git/config will be written into it.
    	 */
    	lock = xcalloc(sizeof(struct lock_file), 1);
    	fd = hold_lock_file_for_update(lock, config_filename, 0);
    	if (fd < 0) {
    		error("could not lock config file %s: %s", config_filename, strerror(errno));
    		free(store.key);
    		ret = CONFIG_NO_LOCK;
    		goto out_free;
    	}
    
    	/*
    	 * If .git/config does not exist yet, write a minimal version.
    	 */
    	in_fd = open(config_filename, O_RDONLY);
    	if ( in_fd < 0 ) {
    		free(store.key);
    
    		if ( ENOENT != errno ) {
    			error("opening %s: %s", config_filename,
    			      strerror(errno));
    			ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
    			goto out_free;
    		}
    		/* if nothing to unset, error out */
    		if (value == NULL) {
    			ret = CONFIG_NOTHING_SET;
    			goto out_free;
    		}
    
    		store.key = (char *)key;
    		if (!store_write_section(fd, key) ||
    		    !store_write_pair(fd, key, value))
    			goto write_err_out;
    	} else {
    		struct stat st;
    		char *contents;
    		size_t contents_sz, copy_begin, copy_end;
    		int i, new_line = 0;
    
    		if (value_regex == NULL)
    			store.value_regex = NULL;
    		else {
    			if (value_regex[0] == '!') {
    				store.do_not_match = 1;
    				value_regex++;
    			} else
    				store.do_not_match = 0;
    
    			store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
    			if (regcomp(store.value_regex, value_regex,
    					REG_EXTENDED)) {
    				error("invalid pattern: %s", value_regex);
    				free(store.value_regex);
    				ret = CONFIG_INVALID_PATTERN;
    				goto out_free;
    			}
    		}
    
    		store.offset[0] = 0;
    		store.state = START;
    		store.seen = 0;
    
    		/*
    		 * After this, store.offset will contain the *end* offset
    		 * of the last match, or remain at 0 if no match was found.
    		 * As a side effect, we make sure to transform only a valid
    		 * existing config file.
    		 */
    		if (git_config_from_file(store_aux, config_filename, NULL)) {
    			error("invalid config file %s", config_filename);
    			free(store.key);
    			if (store.value_regex != NULL) {
    				regfree(store.value_regex);
    				free(store.value_regex);
    			}
    			ret = CONFIG_INVALID_FILE;
    			goto out_free;
    		}
    
    		free(store.key);
    		if (store.value_regex != NULL) {
    			regfree(store.value_regex);
    			free(store.value_regex);
    		}
    
    		/* if nothing to unset, or too many matches, error out */
    		if ((store.seen == 0 && value == NULL) ||
    				(store.seen > 1 && multi_replace == 0)) {
    			ret = CONFIG_NOTHING_SET;
    			goto out_free;
    		}
    
    		fstat(in_fd, &st);
    		contents_sz = xsize_t(st.st_size);
    		contents = xmmap(NULL, contents_sz, PROT_READ,
    			MAP_PRIVATE, in_fd, 0);
    		close(in_fd);
    
    		if (store.seen == 0)
    			store.seen = 1;
    
    		for (i = 0, copy_begin = 0; i < store.seen; i++) {
    			if (store.offset[i] == 0) {
    				store.offset[i] = copy_end = contents_sz;
    			} else if (store.state != KEY_SEEN) {
    				copy_end = store.offset[i];
    			} else
    				copy_end = find_beginning_of_line(
    					contents, contents_sz,
    					store.offset[i]-2, &new_line);
    
    			if (copy_end > 0 && contents[copy_end-1] != '\n')
    				new_line = 1;
    
    			/* write the first part of the config */
    			if (copy_end > copy_begin) {
    				if (write_in_full(fd, contents + copy_begin,
    						  copy_end - copy_begin) <
    				    copy_end - copy_begin)
    					goto write_err_out;
    				if (new_line &&
    				    write_str_in_full(fd, "\n") != 1)
    					goto write_err_out;
    			}
    			copy_begin = store.offset[i];
    		}
    
    		/* write the pair (value == NULL means unset) */
    		if (value != NULL) {
    			if (store.state == START) {
    				if (!store_write_section(fd, key))
    					goto write_err_out;
    			}
    			if (!store_write_pair(fd, key, value))
    				goto write_err_out;
    		}
    
    		/* write the rest of the config */
    		if (copy_begin < contents_sz)
    			if (write_in_full(fd, contents + copy_begin,
    					  contents_sz - copy_begin) <
    			    contents_sz - copy_begin)
    				goto write_err_out;
    
    		munmap(contents, contents_sz);
    	}
    
    	if (commit_lock_file(lock) < 0) {
    		error("could not commit config file %s", config_filename);
    		ret = CONFIG_NO_WRITE;
    		goto out_free;
    	}
    
    	/*
    	 * lock is committed, so don't try to roll it back below.
    	 * NOTE: Since lockfile.c keeps a linked list of all created
    	 * lock_file structures, it isn't safe to free(lock).  It's
    	 * better to just leave it hanging around.
    	 */
    	lock = NULL;
    	ret = 0;
    
    out_free:
    	if (lock)
    		rollback_lock_file(lock);
    	free(filename_buf);
    	return ret;
    
    write_err_out:
    	ret = write_error(lock->filename);
    	goto out_free;
    
    }
    
    int git_config_set_multivar(const char *key, const char *value,
    			const char *value_regex, int multi_replace)
    {
    	return git_config_set_multivar_in_file(NULL, key, value, value_regex,
    					       multi_replace);
    }
    
    static int section_name_match (const char *buf, const char *name)
    {
    	int i = 0, j = 0, dot = 0;
    	if (buf[i] != '[')
    		return 0;
    	for (i = 1; buf[i] && buf[i] != ']'; i++) {
    		if (!dot && isspace(buf[i])) {
    			dot = 1;
    			if (name[j++] != '.')
    				break;
    			for (i++; isspace(buf[i]); i++)
    				; /* do nothing */
    			if (buf[i] != '"')
    				break;
    			continue;
    		}
    		if (buf[i] == '\\' && dot)
    			i++;
    		else if (buf[i] == '"' && dot) {
    			for (i++; isspace(buf[i]); i++)
    				; /* do_nothing */
    			break;
    		}
    		if (buf[i] != name[j++])
    			break;
    	}
    	if (buf[i] == ']' && name[j] == 0) {
    		/*
    		 * We match, now just find the right length offset by
    		 * gobbling up any whitespace after it, as well
    		 */
    		i++;
    		for (; buf[i] && isspace(buf[i]); i++)
    			; /* do nothing */
    		return i;
    	}
    	return 0;
    }
    
    /* if new_name == NULL, the section is removed instead */
    int git_config_rename_section_in_file(const char *config_filename,
    				      const char *old_name, const char *new_name)
    {
    	int ret = 0, remove = 0;
    	char *filename_buf = NULL;
    	struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
    	int out_fd;
    	char buf[1024];
    	FILE *config_file;
    
    	if (!config_filename)
    		config_filename = filename_buf = git_pathdup("config");
    
    	out_fd = hold_lock_file_for_update(lock, config_filename, 0);
    	if (out_fd < 0) {
    		ret = error("could not lock config file %s", config_filename);
    		goto out;
    	}
    
    	if (!(config_file = fopen(config_filename, "rb"))) {
    		/* no config file means nothing to rename, no error */
    		goto unlock_and_out;
    	}
    
    	while (fgets(buf, sizeof(buf), config_file)) {
    		int i;
    		int length;
    		char *output = buf;
    		for (i = 0; buf[i] && isspace(buf[i]); i++)
    			; /* do nothing */
    		if (buf[i] == '[') {
    			/* it's a section */
    			int offset = section_name_match(&buf[i], old_name);
    			if (offset > 0) {
    				ret++;
    				if (new_name == NULL) {
    					remove = 1;
    					continue;
    				}
    				store.baselen = strlen(new_name);
    				if (!store_write_section(out_fd, new_name)) {
    					ret = write_error(lock->filename);
    					goto out;
    				}
    				/*
    				 * We wrote out the new section, with
    				 * a newline, now skip the old
    				 * section's length
    				 */
    				output += offset + i;
    				if (strlen(output) > 0) {
    					/*
    					 * More content means there's
    					 * a declaration to put on the
    					 * next line; indent with a
    					 * tab
    					 */
    					output -= 1;
    					output[0] = '\t';
    				}
    			}
    			remove = 0;
    		}
    		if (remove)
    			continue;
    		length = strlen(output);
    		if (write_in_full(out_fd, output, length) != length) {
    			ret = write_error(lock->filename);
    			goto out;
    		}
    	}
    	fclose(config_file);
    unlock_and_out:
    	if (commit_lock_file(lock) < 0)
    		ret = error("could not commit config file %s", config_filename);
    out:
    	free(filename_buf);
    	return ret;
    }
    
    int git_config_rename_section(const char *old_name, const char *new_name)
    {
    	return git_config_rename_section_in_file(NULL, old_name, new_name);
    }
    
    /*
     * Call this to report error for your variable that should not
     * get a boolean value (i.e. "[my] var" means "true").
     */
    int config_error_nonbool(const char *var)
    {
    	return error("Missing value for '%s'", var);
    }