Adding upstream version 1:2.43.0.upstream/1%2.43.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1002 insertions, 0 deletions

diff --git a/builtin/config.c b/builtin/config.c
new file mode 100644
index 0000000..11a4d4e
--- /dev/null
+++ b/builtin/config.c
@@ -0,0 +1,1002 @@
+#include "builtin.h"
+#include "abspath.h"
+#include "config.h"
+#include "color.h"
+#include "editor.h"
+#include "environment.h"
+#include "repository.h"
+#include "gettext.h"
+#include "ident.h"
+#include "parse-options.h"
+#include "urlmatch.h"
+#include "path.h"
+#include "quote.h"
+#include "setup.h"
+#include "strbuf.h"
+#include "worktree.h"
+
+static const char *const builtin_config_usage[] = {
+	N_("git config [<options>]"),
+	NULL
+};
+
+static char *key;
+static regex_t *key_regexp;
+static const char *value_pattern;
+static regex_t *regexp;
+static int show_keys;
+static int omit_values;
+static int use_key_regexp;
+static int do_all;
+static int do_not_match;
+static char delim = '=';
+static char key_delim = ' ';
+static char term = '\n';
+
+static int use_global_config, use_system_config, use_local_config;
+static int use_worktree_config;
+static struct git_config_source given_config_source;
+static int actions, type;
+static char *default_value;
+static int end_nul;
+static int respect_includes_opt = -1;
+static struct config_options config_options;
+static int show_origin;
+static int show_scope;
+static int fixed_value;
+
+#define ACTION_GET (1<<0)
+#define ACTION_GET_ALL (1<<1)
+#define ACTION_GET_REGEXP (1<<2)
+#define ACTION_REPLACE_ALL (1<<3)
+#define ACTION_ADD (1<<4)
+#define ACTION_UNSET (1<<5)
+#define ACTION_UNSET_ALL (1<<6)
+#define ACTION_RENAME_SECTION (1<<7)
+#define ACTION_REMOVE_SECTION (1<<8)
+#define ACTION_LIST (1<<9)
+#define ACTION_EDIT (1<<10)
+#define ACTION_SET (1<<11)
+#define ACTION_SET_ALL (1<<12)
+#define ACTION_GET_COLOR (1<<13)
+#define ACTION_GET_COLORBOOL (1<<14)
+#define ACTION_GET_URLMATCH (1<<15)
+
+/*
+ * The actions "ACTION_LIST | ACTION_GET_*" which may produce more than
+ * one line of output and which should therefore be paged.
+ */
+#define PAGING_ACTIONS (ACTION_LIST | ACTION_GET_ALL | \
+			ACTION_GET_REGEXP | ACTION_GET_URLMATCH)
+
+#define TYPE_BOOL		1
+#define TYPE_INT		2
+#define TYPE_BOOL_OR_INT	3
+#define TYPE_PATH		4
+#define TYPE_EXPIRY_DATE	5
+#define TYPE_COLOR		6
+#define TYPE_BOOL_OR_STR	7
+
+#define OPT_CALLBACK_VALUE(s, l, v, h, i) \
+	{ OPTION_CALLBACK, (s), (l), (v), NULL, (h), PARSE_OPT_NOARG | \
+	PARSE_OPT_NONEG, option_parse_type, (i) }
+
+static NORETURN void usage_builtin_config(void);
+
+static int option_parse_type(const struct option *opt, const char *arg,
+			     int unset)
+{
+	int new_type, *to_type;
+
+	if (unset) {
+		*((int *) opt->value) = 0;
+		return 0;
+	}
+
+	/*
+	 * To support '--<type>' style flags, begin with new_type equal to
+	 * opt->defval.
+	 */
+	new_type = opt->defval;
+	if (!new_type) {
+		if (!strcmp(arg, "bool"))
+			new_type = TYPE_BOOL;
+		else if (!strcmp(arg, "int"))
+			new_type = TYPE_INT;
+		else if (!strcmp(arg, "bool-or-int"))
+			new_type = TYPE_BOOL_OR_INT;
+		else if (!strcmp(arg, "bool-or-str"))
+			new_type = TYPE_BOOL_OR_STR;
+		else if (!strcmp(arg, "path"))
+			new_type = TYPE_PATH;
+		else if (!strcmp(arg, "expiry-date"))
+			new_type = TYPE_EXPIRY_DATE;
+		else if (!strcmp(arg, "color"))
+			new_type = TYPE_COLOR;
+		else
+			die(_("unrecognized --type argument, %s"), arg);
+	}
+
+	to_type = opt->value;
+	if (*to_type && *to_type != new_type) {
+		/*
+		 * Complain when there is a new type not equal to the old type.
+		 * This allows for combinations like '--int --type=int' and
+		 * '--type=int --type=int', but disallows ones like '--type=bool
+		 * --int' and '--type=bool
+		 * --type=int'.
+		 */
+		error(_("only one type at a time"));
+		usage_builtin_config();
+	}
+	*to_type = new_type;
+
+	return 0;
+}
+
+static struct option builtin_config_options[] = {
+	OPT_GROUP(N_("Config file location")),
+	OPT_BOOL(0, "global", &use_global_config, N_("use global config file")),
+	OPT_BOOL(0, "system", &use_system_config, N_("use system config file")),
+	OPT_BOOL(0, "local", &use_local_config, N_("use repository config file")),
+	OPT_BOOL(0, "worktree", &use_worktree_config, N_("use per-worktree config file")),
+	OPT_STRING('f', "file", &given_config_source.file, N_("file"), N_("use given config file")),
+	OPT_STRING(0, "blob", &given_config_source.blob, N_("blob-id"), N_("read config from given blob object")),
+	OPT_GROUP(N_("Action")),
+	OPT_BIT(0, "get", &actions, N_("get value: name [value-pattern]"), ACTION_GET),
+	OPT_BIT(0, "get-all", &actions, N_("get all values: key [value-pattern]"), ACTION_GET_ALL),
+	OPT_BIT(0, "get-regexp", &actions, N_("get values for regexp: name-regex [value-pattern]"), ACTION_GET_REGEXP),
+	OPT_BIT(0, "get-urlmatch", &actions, N_("get value specific for the URL: section[.var] URL"), ACTION_GET_URLMATCH),
+	OPT_BIT(0, "replace-all", &actions, N_("replace all matching variables: name value [value-pattern]"), ACTION_REPLACE_ALL),
+	OPT_BIT(0, "add", &actions, N_("add a new variable: name value"), ACTION_ADD),
+	OPT_BIT(0, "unset", &actions, N_("remove a variable: name [value-pattern]"), ACTION_UNSET),
+	OPT_BIT(0, "unset-all", &actions, N_("remove all matches: name [value-pattern]"), ACTION_UNSET_ALL),
+	OPT_BIT(0, "rename-section", &actions, N_("rename section: old-name new-name"), ACTION_RENAME_SECTION),
+	OPT_BIT(0, "remove-section", &actions, N_("remove a section: name"), ACTION_REMOVE_SECTION),
+	OPT_BIT('l', "list", &actions, N_("list all"), ACTION_LIST),
+	OPT_BOOL(0, "fixed-value", &fixed_value, N_("use string equality when comparing values to 'value-pattern'")),
+	OPT_BIT('e', "edit", &actions, N_("open an editor"), ACTION_EDIT),
+	OPT_BIT(0, "get-color", &actions, N_("find the color configured: slot [default]"), ACTION_GET_COLOR),
+	OPT_BIT(0, "get-colorbool", &actions, N_("find the color setting: slot [stdout-is-tty]"), ACTION_GET_COLORBOOL),
+	OPT_GROUP(N_("Type")),
+	OPT_CALLBACK('t', "type", &type, N_("type"), N_("value is given this type"), option_parse_type),
+	OPT_CALLBACK_VALUE(0, "bool", &type, N_("value is \"true\" or \"false\""), TYPE_BOOL),
+	OPT_CALLBACK_VALUE(0, "int", &type, N_("value is decimal number"), TYPE_INT),
+	OPT_CALLBACK_VALUE(0, "bool-or-int", &type, N_("value is --bool or --int"), TYPE_BOOL_OR_INT),
+	OPT_CALLBACK_VALUE(0, "bool-or-str", &type, N_("value is --bool or string"), TYPE_BOOL_OR_STR),
+	OPT_CALLBACK_VALUE(0, "path", &type, N_("value is a path (file or directory name)"), TYPE_PATH),
+	OPT_CALLBACK_VALUE(0, "expiry-date", &type, N_("value is an expiry date"), TYPE_EXPIRY_DATE),
+	OPT_GROUP(N_("Other")),
+	OPT_BOOL('z', "null", &end_nul, N_("terminate values with NUL byte")),
+	OPT_BOOL(0, "name-only", &omit_values, N_("show variable names only")),
+	OPT_BOOL(0, "includes", &respect_includes_opt, N_("respect include directives on lookup")),
+	OPT_BOOL(0, "show-origin", &show_origin, N_("show origin of config (file, standard input, blob, command line)")),
+	OPT_BOOL(0, "show-scope", &show_scope, N_("show scope of config (worktree, local, global, system, command)")),
+	OPT_STRING(0, "default", &default_value, N_("value"), N_("with --get, use default value when missing entry")),
+	OPT_END(),
+};
+
+static NORETURN void usage_builtin_config(void)
+{
+	usage_with_options(builtin_config_usage, builtin_config_options);
+}
+
+static void check_argc(int argc, int min, int max)
+{
+	if (argc >= min && argc <= max)
+		return;
+	if (min == max)
+		error(_("wrong number of arguments, should be %d"), min);
+	else
+		error(_("wrong number of arguments, should be from %d to %d"),
+		      min, max);
+	usage_builtin_config();
+}
+
+static void show_config_origin(const struct key_value_info *kvi,
+			       struct strbuf *buf)
+{
+	const char term = end_nul ? '\0' : '\t';
+
+	strbuf_addstr(buf, config_origin_type_name(kvi->origin_type));
+	strbuf_addch(buf, ':');
+	if (end_nul)
+		strbuf_addstr(buf, kvi->filename ? kvi->filename : "");
+	else
+		quote_c_style(kvi->filename ? kvi->filename : "", buf, NULL, 0);
+	strbuf_addch(buf, term);
+}
+
+static void show_config_scope(const struct key_value_info *kvi,
+			      struct strbuf *buf)
+{
+	const char term = end_nul ? '\0' : '\t';
+	const char *scope = config_scope_name(kvi->scope);
+
+	strbuf_addstr(buf, N_(scope));
+	strbuf_addch(buf, term);
+}
+
+static int show_all_config(const char *key_, const char *value_,
+			   const struct config_context *ctx,
+			   void *cb UNUSED)
+{
+	const struct key_value_info *kvi = ctx->kvi;
+
+	if (show_origin || show_scope) {
+		struct strbuf buf = STRBUF_INIT;
+		if (show_scope)
+			show_config_scope(kvi, &buf);
+		if (show_origin)
+			show_config_origin(kvi, &buf);
+		/* Use fwrite as "buf" can contain \0's if "end_null" is set. */
+		fwrite(buf.buf, 1, buf.len, stdout);
+		strbuf_release(&buf);
+	}
+	if (!omit_values && value_)
+		printf("%s%c%s%c", key_, delim, value_, term);
+	else
+		printf("%s%c", key_, term);
+	return 0;
+}
+
+struct strbuf_list {
+	struct strbuf *items;
+	int nr;
+	int alloc;
+};
+
+static int format_config(struct strbuf *buf, const char *key_,
+			 const char *value_, const struct key_value_info *kvi)
+{
+	if (show_scope)
+		show_config_scope(kvi, buf);
+	if (show_origin)
+		show_config_origin(kvi, buf);
+	if (show_keys)
+		strbuf_addstr(buf, key_);
+	if (!omit_values) {
+		if (show_keys)
+			strbuf_addch(buf, key_delim);
+
+		if (type == TYPE_INT)
+			strbuf_addf(buf, "%"PRId64,
+				    git_config_int64(key_, value_ ? value_ : "", kvi));
+		else if (type == TYPE_BOOL)
+			strbuf_addstr(buf, git_config_bool(key_, value_) ?
+				      "true" : "false");
+		else if (type == TYPE_BOOL_OR_INT) {
+			int is_bool, v;
+			v = git_config_bool_or_int(key_, value_, kvi,
+						   &is_bool);
+			if (is_bool)
+				strbuf_addstr(buf, v ? "true" : "false");
+			else
+				strbuf_addf(buf, "%d", v);
+		} else if (type == TYPE_BOOL_OR_STR) {
+			int v = git_parse_maybe_bool(value_);
+			if (v < 0)
+				strbuf_addstr(buf, value_);
+			else
+				strbuf_addstr(buf, v ? "true" : "false");
+		} else if (type == TYPE_PATH) {
+			const char *v;
+			if (git_config_pathname(&v, key_, value_) < 0)
+				return -1;
+			strbuf_addstr(buf, v);
+			free((char *)v);
+		} else if (type == TYPE_EXPIRY_DATE) {
+			timestamp_t t;
+			if (git_config_expiry_date(&t, key_, value_) < 0)
+				return -1;
+			strbuf_addf(buf, "%"PRItime, t);
+		} else if (type == TYPE_COLOR) {
+			char v[COLOR_MAXLEN];
+			if (git_config_color(v, key_, value_) < 0)
+				return -1;
+			strbuf_addstr(buf, v);
+		} else if (value_) {
+			strbuf_addstr(buf, value_);
+		} else {
+			/* Just show the key name; back out delimiter */
+			if (show_keys)
+				strbuf_setlen(buf, buf->len - 1);
+		}
+	}
+	strbuf_addch(buf, term);
+	return 0;
+}
+
+static int collect_config(const char *key_, const char *value_,
+			  const struct config_context *ctx, void *cb)
+{
+	struct strbuf_list *values = cb;
+	const struct key_value_info *kvi = ctx->kvi;
+
+	if (!use_key_regexp && strcmp(key_, key))
+		return 0;
+	if (use_key_regexp && regexec(key_regexp, key_, 0, NULL, 0))
+		return 0;
+	if (fixed_value && strcmp(value_pattern, (value_?value_:"")))
+		return 0;
+	if (regexp != NULL &&
+	    (do_not_match ^ !!regexec(regexp, (value_?value_:""), 0, NULL, 0)))
+		return 0;
+
+	ALLOC_GROW(values->items, values->nr + 1, values->alloc);
+	strbuf_init(&values->items[values->nr], 0);
+
+	return format_config(&values->items[values->nr++], key_, value_, kvi);
+}
+
+static int get_value(const char *key_, const char *regex_, unsigned flags)
+{
+	int ret = CONFIG_GENERIC_ERROR;
+	struct strbuf_list values = {NULL};
+	int i;
+
+	if (use_key_regexp) {
+		char *tl;
+
+		/*
+		 * NEEDSWORK: this naive pattern lowercasing obviously does not
+		 * work for more complex patterns like "^[^.]*Foo.*bar".
+		 * Perhaps we should deprecate this altogether someday.
+		 */
+
+		key = xstrdup(key_);
+		for (tl = key + strlen(key) - 1;
+		     tl >= key && *tl != '.';
+		     tl--)
+			*tl = tolower(*tl);
+		for (tl = key; *tl && *tl != '.'; tl++)
+			*tl = tolower(*tl);
+
+		key_regexp = (regex_t*)xmalloc(sizeof(regex_t));
+		if (regcomp(key_regexp, key, REG_EXTENDED)) {
+			error(_("invalid key pattern: %s"), key_);
+			FREE_AND_NULL(key_regexp);
+			ret = CONFIG_INVALID_PATTERN;
+			goto free_strings;
+		}
+	} else {
+		if (git_config_parse_key(key_, &key, NULL)) {
+			ret = CONFIG_INVALID_KEY;
+			goto free_strings;
+		}
+	}
+
+	if (regex_ && (flags & CONFIG_FLAGS_FIXED_VALUE))
+		value_pattern = regex_;
+	else if (regex_) {
+		if (regex_[0] == '!') {
+			do_not_match = 1;
+			regex_++;
+		}
+
+		regexp = (regex_t*)xmalloc(sizeof(regex_t));
+		if (regcomp(regexp, regex_, REG_EXTENDED)) {
+			error(_("invalid pattern: %s"), regex_);
+			FREE_AND_NULL(regexp);
+			ret = CONFIG_INVALID_PATTERN;
+			goto free_strings;
+		}
+	}
+
+	config_with_options(collect_config, &values,
+			    &given_config_source, the_repository,
+			    &config_options);
+
+	if (!values.nr && default_value) {
+		struct key_value_info kvi = KVI_INIT;
+		struct strbuf *item;
+
+		kvi_from_param(&kvi);
+		ALLOC_GROW(values.items, values.nr + 1, values.alloc);
+		item = &values.items[values.nr++];
+		strbuf_init(item, 0);
+		if (format_config(item, key_, default_value, &kvi) < 0)
+			die(_("failed to format default config value: %s"),
+				default_value);
+	}
+
+	ret = !values.nr;
+
+	for (i = 0; i < values.nr; i++) {
+		struct strbuf *buf = values.items + i;
+		if (do_all || i == values.nr - 1)
+			fwrite(buf->buf, 1, buf->len, stdout);
+		strbuf_release(buf);
+	}
+	free(values.items);
+
+free_strings:
+	free(key);
+	if (key_regexp) {
+		regfree(key_regexp);
+		free(key_regexp);
+	}
+	if (regexp) {
+		regfree(regexp);
+		free(regexp);
+	}
+
+	return ret;
+}
+
+static char *normalize_value(const char *key, const char *value,
+			     struct key_value_info *kvi)
+{
+	if (!value)
+		return NULL;
+
+	if (type == 0 || type == TYPE_PATH || type == TYPE_EXPIRY_DATE)
+		/*
+		 * We don't do normalization for TYPE_PATH here: If
+		 * the path is like ~/foobar/, we prefer to store
+		 * "~/foobar/" in the config file, and to expand the ~
+		 * when retrieving the value.
+		 * Also don't do normalization for expiry dates.
+		 */
+		return xstrdup(value);
+	if (type == TYPE_INT)
+		return xstrfmt("%"PRId64, git_config_int64(key, value, kvi));
+	if (type == TYPE_BOOL)
+		return xstrdup(git_config_bool(key, value) ?  "true" : "false");
+	if (type == TYPE_BOOL_OR_INT) {
+		int is_bool, v;
+		v = git_config_bool_or_int(key, value, kvi, &is_bool);
+		if (!is_bool)
+			return xstrfmt("%d", v);
+		else
+			return xstrdup(v ? "true" : "false");
+	}
+	if (type == TYPE_BOOL_OR_STR) {
+		int v = git_parse_maybe_bool(value);
+		if (v < 0)
+			return xstrdup(value);
+		else
+			return xstrdup(v ? "true" : "false");
+	}
+	if (type == TYPE_COLOR) {
+		char v[COLOR_MAXLEN];
+		if (git_config_color(v, key, value))
+			die(_("cannot parse color '%s'"), value);
+
+		/*
+		 * The contents of `v` now contain an ANSI escape
+		 * sequence, not suitable for including within a
+		 * configuration file. Treat the above as a
+		 * "sanity-check", and return the given value, which we
+		 * know is representable as valid color code.
+		 */
+		return xstrdup(value);
+	}
+
+	BUG("cannot normalize type %d", type);
+}
+
+static int get_color_found;
+static const char *get_color_slot;
+static const char *get_colorbool_slot;
+static char parsed_color[COLOR_MAXLEN];
+
+static int git_get_color_config(const char *var, const char *value,
+				const struct config_context *ctx UNUSED,
+				void *cb UNUSED)
+{
+	if (!strcmp(var, get_color_slot)) {
+		if (!value)
+			config_error_nonbool(var);
+		if (color_parse(value, parsed_color) < 0)
+			return -1;
+		get_color_found = 1;
+	}
+	return 0;
+}
+
+static void get_color(const char *var, const char *def_color)
+{
+	get_color_slot = var;
+	get_color_found = 0;
+	parsed_color[0] = '\0';
+	config_with_options(git_get_color_config, NULL,
+			    &given_config_source, the_repository,
+			    &config_options);
+
+	if (!get_color_found && def_color) {
+		if (color_parse(def_color, parsed_color) < 0)
+			die(_("unable to parse default color value"));
+	}
+
+	fputs(parsed_color, stdout);
+}
+
+static int get_colorbool_found;
+static int get_diff_color_found;
+static int get_color_ui_found;
+static int git_get_colorbool_config(const char *var, const char *value,
+				    const struct config_context *ctx UNUSED,
+				    void *data UNUSED)
+{
+	if (!strcmp(var, get_colorbool_slot))
+		get_colorbool_found = git_config_colorbool(var, value);
+	else if (!strcmp(var, "diff.color"))
+		get_diff_color_found = git_config_colorbool(var, value);
+	else if (!strcmp(var, "color.ui"))
+		get_color_ui_found = git_config_colorbool(var, value);
+	return 0;
+}
+
+static int get_colorbool(const char *var, int print)
+{
+	get_colorbool_slot = var;
+	get_colorbool_found = -1;
+	get_diff_color_found = -1;
+	get_color_ui_found = -1;
+	config_with_options(git_get_colorbool_config, NULL,
+			    &given_config_source, the_repository,
+			    &config_options);
+
+	if (get_colorbool_found < 0) {
+		if (!strcmp(get_colorbool_slot, "color.diff"))
+			get_colorbool_found = get_diff_color_found;
+		if (get_colorbool_found < 0)
+			get_colorbool_found = get_color_ui_found;
+	}
+
+	if (get_colorbool_found < 0)
+		/* default value if none found in config */
+		get_colorbool_found = GIT_COLOR_AUTO;
+
+	get_colorbool_found = want_color(get_colorbool_found);
+
+	if (print) {
+		printf("%s\n", get_colorbool_found ? "true" : "false");
+		return 0;
+	} else
+		return get_colorbool_found ? 0 : 1;
+}
+
+static void check_write(void)
+{
+	if (!given_config_source.file && !startup_info->have_repository)
+		die(_("not in a git directory"));
+
+	if (given_config_source.use_stdin)
+		die(_("writing to stdin is not supported"));
+
+	if (given_config_source.blob)
+		die(_("writing config blobs is not supported"));
+}
+
+struct urlmatch_current_candidate_value {
+	char value_is_null;
+	struct strbuf value;
+	struct key_value_info kvi;
+};
+
+static int urlmatch_collect_fn(const char *var, const char *value,
+			       const struct config_context *ctx,
+			       void *cb)
+{
+	struct string_list *values = cb;
+	struct string_list_item *item = string_list_insert(values, var);
+	struct urlmatch_current_candidate_value *matched = item->util;
+	const struct key_value_info *kvi = ctx->kvi;
+
+	if (!matched) {
+		matched = xmalloc(sizeof(*matched));
+		strbuf_init(&matched->value, 0);
+		item->util = matched;
+	} else {
+		strbuf_reset(&matched->value);
+	}
+	matched->kvi = *kvi;
+
+	if (value) {
+		strbuf_addstr(&matched->value, value);
+		matched->value_is_null = 0;
+	} else {
+		matched->value_is_null = 1;
+	}
+	return 0;
+}
+
+static int get_urlmatch(const char *var, const char *url)
+{
+	int ret;
+	char *section_tail;
+	struct string_list_item *item;
+	struct urlmatch_config config = URLMATCH_CONFIG_INIT;
+	struct string_list values = STRING_LIST_INIT_DUP;
+
+	config.collect_fn = urlmatch_collect_fn;
+	config.cascade_fn = NULL;
+	config.cb = &values;
+
+	if (!url_normalize(url, &config.url))
+		die("%s", config.url.err);
+
+	config.section = xstrdup_tolower(var);
+	section_tail = strchr(config.section, '.');
+	if (section_tail) {
+		*section_tail = '\0';
+		config.key = section_tail + 1;
+		show_keys = 0;
+	} else {
+		config.key = NULL;
+		show_keys = 1;
+	}
+
+	config_with_options(urlmatch_config_entry, &config,
+			    &given_config_source, the_repository,
+			    &config_options);
+
+	ret = !values.nr;
+
+	for_each_string_list_item(item, &values) {
+		struct urlmatch_current_candidate_value *matched = item->util;
+		struct strbuf buf = STRBUF_INIT;
+
+		format_config(&buf, item->string,
+			      matched->value_is_null ? NULL : matched->value.buf,
+			      &matched->kvi);
+		fwrite(buf.buf, 1, buf.len, stdout);
+		strbuf_release(&buf);
+
+		strbuf_release(&matched->value);
+	}
+	urlmatch_config_release(&config);
+	string_list_clear(&values, 1);
+	free(config.url.url);
+
+	free((void *)config.section);
+	return ret;
+}
+
+static char *default_user_config(void)
+{
+	struct strbuf buf = STRBUF_INIT;
+	strbuf_addf(&buf,
+		    _("# This is Git's per-user configuration file.\n"
+		      "[user]\n"
+		      "# Please adapt and uncomment the following lines:\n"
+		      "#	name = %s\n"
+		      "#	email = %s\n"),
+		    ident_default_name(),
+		    ident_default_email());
+	return strbuf_detach(&buf, NULL);
+}
+
+int cmd_config(int argc, const char **argv, const char *prefix)
+{
+	int nongit = !startup_info->have_repository;
+	char *value = NULL;
+	int flags = 0;
+	int ret = 0;
+	struct key_value_info default_kvi = KVI_INIT;
+
+	given_config_source.file = xstrdup_or_null(getenv(CONFIG_ENVIRONMENT));
+
+	argc = parse_options(argc, argv, prefix, builtin_config_options,
+			     builtin_config_usage,
+			     PARSE_OPT_STOP_AT_NON_OPTION);
+
+	if (use_global_config + use_system_config + use_local_config +
+	    use_worktree_config +
+	    !!given_config_source.file + !!given_config_source.blob > 1) {
+		error(_("only one config file at a time"));
+		usage_builtin_config();
+	}
+
+	if (nongit) {
+		if (use_local_config)
+			die(_("--local can only be used inside a git repository"));
+		if (given_config_source.blob)
+			die(_("--blob can only be used inside a git repository"));
+		if (use_worktree_config)
+			die(_("--worktree can only be used inside a git repository"));
+
+	}
+
+	if (given_config_source.file &&
+			!strcmp(given_config_source.file, "-")) {
+		given_config_source.file = NULL;
+		given_config_source.use_stdin = 1;
+		given_config_source.scope = CONFIG_SCOPE_COMMAND;
+	}
+
+	if (use_global_config) {
+		char *user_config, *xdg_config;
+
+		git_global_config(&user_config, &xdg_config);
+		if (!user_config)
+			/*
+			 * It is unknown if HOME/.gitconfig exists, so
+			 * we do not know if we should write to XDG
+			 * location; error out even if XDG_CONFIG_HOME
+			 * is set and points at a sane location.
+			 */
+			die(_("$HOME not set"));
+
+		given_config_source.scope = CONFIG_SCOPE_GLOBAL;
+
+		if (access_or_warn(user_config, R_OK, 0) &&
+		    xdg_config && !access_or_warn(xdg_config, R_OK, 0)) {
+			given_config_source.file = xdg_config;
+			free(user_config);
+		} else {
+			given_config_source.file = user_config;
+			free(xdg_config);
+		}
+	}
+	else if (use_system_config) {
+		given_config_source.file = git_system_config();
+		given_config_source.scope = CONFIG_SCOPE_SYSTEM;
+	} else if (use_local_config) {
+		given_config_source.file = git_pathdup("config");
+		given_config_source.scope = CONFIG_SCOPE_LOCAL;
+	} else if (use_worktree_config) {
+		struct worktree **worktrees = get_worktrees();
+		if (the_repository->repository_format_worktree_config)
+			given_config_source.file = git_pathdup("config.worktree");
+		else if (worktrees[0] && worktrees[1])
+			die(_("--worktree cannot be used with multiple "
+			      "working trees unless the config\n"
+			      "extension worktreeConfig is enabled. "
+			      "Please read \"CONFIGURATION FILE\"\n"
+			      "section in \"git help worktree\" for details"));
+		else
+			given_config_source.file = git_pathdup("config");
+		given_config_source.scope = CONFIG_SCOPE_LOCAL;
+		free_worktrees(worktrees);
+	} else if (given_config_source.file) {
+		if (!is_absolute_path(given_config_source.file) && prefix)
+			given_config_source.file =
+				prefix_filename(prefix, given_config_source.file);
+		given_config_source.scope = CONFIG_SCOPE_COMMAND;
+	} else if (given_config_source.blob) {
+		given_config_source.scope = CONFIG_SCOPE_COMMAND;
+	}
+
+
+	if (respect_includes_opt == -1)
+		config_options.respect_includes = !given_config_source.file;
+	else
+		config_options.respect_includes = respect_includes_opt;
+	if (!nongit) {
+		config_options.commondir = get_git_common_dir();
+		config_options.git_dir = get_git_dir();
+	}
+
+	if (end_nul) {
+		term = '\0';
+		delim = '\n';
+		key_delim = '\n';
+	}
+
+	if ((actions & (ACTION_GET_COLOR|ACTION_GET_COLORBOOL)) && type) {
+		error(_("--get-color and variable type are incoherent"));
+		usage_builtin_config();
+	}
+
+	if (HAS_MULTI_BITS(actions)) {
+		error(_("only one action at a time"));
+		usage_builtin_config();
+	}
+	if (actions == 0)
+		switch (argc) {
+		case 1: actions = ACTION_GET; break;
+		case 2: actions = ACTION_SET; break;
+		case 3: actions = ACTION_SET_ALL; break;
+		default:
+			usage_builtin_config();
+		}
+	if (omit_values &&
+	    !(actions == ACTION_LIST || actions == ACTION_GET_REGEXP)) {
+		error(_("--name-only is only applicable to --list or --get-regexp"));
+		usage_builtin_config();
+	}
+
+	if (show_origin && !(actions &
+		(ACTION_GET|ACTION_GET_ALL|ACTION_GET_REGEXP|ACTION_LIST))) {
+		error(_("--show-origin is only applicable to --get, --get-all, "
+			"--get-regexp, and --list"));
+		usage_builtin_config();
+	}
+
+	if (default_value && !(actions & ACTION_GET)) {
+		error(_("--default is only applicable to --get"));
+		usage_builtin_config();
+	}
+
+	/* check usage of --fixed-value */
+	if (fixed_value) {
+		int allowed_usage = 0;
+
+		switch (actions) {
+		/* git config --get <name> <value-pattern> */
+		case ACTION_GET:
+		/* git config --get-all <name> <value-pattern> */
+		case ACTION_GET_ALL:
+		/* git config --get-regexp <name-pattern> <value-pattern> */
+		case ACTION_GET_REGEXP:
+		/* git config --unset <name> <value-pattern> */
+		case ACTION_UNSET:
+		/* git config --unset-all <name> <value-pattern> */
+		case ACTION_UNSET_ALL:
+			allowed_usage = argc > 1 && !!argv[1];
+			break;
+
+		/* git config <name> <value> <value-pattern> */
+		case ACTION_SET_ALL:
+		/* git config --replace-all <name> <value> <value-pattern> */
+		case ACTION_REPLACE_ALL:
+			allowed_usage = argc > 2 && !!argv[2];
+			break;
+
+		/* other options don't allow --fixed-value */
+		}
+
+		if (!allowed_usage) {
+			error(_("--fixed-value only applies with 'value-pattern'"));
+			usage_builtin_config();
+		}
+
+		flags |= CONFIG_FLAGS_FIXED_VALUE;
+	}
+
+	if (actions & PAGING_ACTIONS)
+		setup_auto_pager("config", 1);
+
+	if (actions == ACTION_LIST) {
+		check_argc(argc, 0, 0);
+		if (config_with_options(show_all_config, NULL,
+					&given_config_source, the_repository,
+					&config_options) < 0) {
+			if (given_config_source.file)
+				die_errno(_("unable to read config file '%s'"),
+					  given_config_source.file);
+			else
+				die(_("error processing config file(s)"));
+		}
+	}
+	else if (actions == ACTION_EDIT) {
+		char *config_file;
+
+		check_argc(argc, 0, 0);
+		if (!given_config_source.file && nongit)
+			die(_("not in a git directory"));
+		if (given_config_source.use_stdin)
+			die(_("editing stdin is not supported"));
+		if (given_config_source.blob)
+			die(_("editing blobs is not supported"));
+		git_config(git_default_config, NULL);
+		config_file = given_config_source.file ?
+				xstrdup(given_config_source.file) :
+				git_pathdup("config");
+		if (use_global_config) {
+			int fd = open(config_file, O_CREAT | O_EXCL | O_WRONLY, 0666);
+			if (fd >= 0) {
+				char *content = default_user_config();
+				write_str_in_full(fd, content);
+				free(content);
+				close(fd);
+			}
+			else if (errno != EEXIST)
+				die_errno(_("cannot create configuration file %s"), config_file);
+		}
+		launch_editor(config_file, NULL, NULL);
+		free(config_file);
+	}
+	else if (actions == ACTION_SET) {
+		check_write();
+		check_argc(argc, 2, 2);
+		value = normalize_value(argv[0], argv[1], &default_kvi);
+		ret = git_config_set_in_file_gently(given_config_source.file, argv[0], value);
+		if (ret == CONFIG_NOTHING_SET)
+			error(_("cannot overwrite multiple values with a single value\n"
+			"       Use a regexp, --add or --replace-all to change %s."), argv[0]);
+	}
+	else if (actions == ACTION_SET_ALL) {
+		check_write();
+		check_argc(argc, 2, 3);
+		value = normalize_value(argv[0], argv[1], &default_kvi);
+		ret = git_config_set_multivar_in_file_gently(given_config_source.file,
+							     argv[0], value, argv[2],
+							     flags);
+	}
+	else if (actions == ACTION_ADD) {
+		check_write();
+		check_argc(argc, 2, 2);
+		value = normalize_value(argv[0], argv[1], &default_kvi);
+		ret = git_config_set_multivar_in_file_gently(given_config_source.file,
+							     argv[0], value,
+							     CONFIG_REGEX_NONE,
+							     flags);
+	}
+	else if (actions == ACTION_REPLACE_ALL) {
+		check_write();
+		check_argc(argc, 2, 3);
+		value = normalize_value(argv[0], argv[1], &default_kvi);
+		ret = git_config_set_multivar_in_file_gently(given_config_source.file,
+							     argv[0], value, argv[2],
+							     flags | CONFIG_FLAGS_MULTI_REPLACE);
+	}
+	else if (actions == ACTION_GET) {
+		check_argc(argc, 1, 2);
+		return get_value(argv[0], argv[1], flags);
+	}
+	else if (actions == ACTION_GET_ALL) {
+		do_all = 1;
+		check_argc(argc, 1, 2);
+		return get_value(argv[0], argv[1], flags);
+	}
+	else if (actions == ACTION_GET_REGEXP) {
+		show_keys = 1;
+		use_key_regexp = 1;
+		do_all = 1;
+		check_argc(argc, 1, 2);
+		return get_value(argv[0], argv[1], flags);
+	}
+	else if (actions == ACTION_GET_URLMATCH) {
+		check_argc(argc, 2, 2);
+		return get_urlmatch(argv[0], argv[1]);
+	}
+	else if (actions == ACTION_UNSET) {
+		check_write();
+		check_argc(argc, 1, 2);
+		if (argc == 2)
+			return git_config_set_multivar_in_file_gently(given_config_source.file,
+								      argv[0], NULL, argv[1],
+								      flags);
+		else
+			return git_config_set_in_file_gently(given_config_source.file,
+							     argv[0], NULL);
+	}
+	else if (actions == ACTION_UNSET_ALL) {
+		check_write();
+		check_argc(argc, 1, 2);
+		return git_config_set_multivar_in_file_gently(given_config_source.file,
+							      argv[0], NULL, argv[1],
+							      flags | CONFIG_FLAGS_MULTI_REPLACE);
+	}
+	else if (actions == ACTION_RENAME_SECTION) {
+		check_write();
+		check_argc(argc, 2, 2);
+		ret = git_config_rename_section_in_file(given_config_source.file,
+							argv[0], argv[1]);
+		if (ret < 0)
+			return ret;
+		else if (!ret)
+			die(_("no such section: %s"), argv[0]);
+		else
+			ret = 0;
+	}
+	else if (actions == ACTION_REMOVE_SECTION) {
+		check_write();
+		check_argc(argc, 1, 1);
+		ret = git_config_rename_section_in_file(given_config_source.file,
+							argv[0], NULL);
+		if (ret < 0)
+			return ret;
+		else if (!ret)
+			die(_("no such section: %s"), argv[0]);
+		else
+			ret = 0;
+	}
+	else if (actions == ACTION_GET_COLOR) {
+		check_argc(argc, 1, 2);
+		get_color(argv[0], argv[1]);
+	}
+	else if (actions == ACTION_GET_COLORBOOL) {
+		check_argc(argc, 1, 2);
+		if (argc == 2)
+			color_stdout_is_tty = git_config_bool("command line", argv[1]);
+		return get_colorbool(argv[0], argc == 2);
+	}
+
+	free(value);
+	return ret;
+}