Throw error on unsupported setting

This should help weed out old junk settings from
old versions of CDB config.

cdbrelease.js

@@ -29,7 +29,8 @@ module.exports = async gitexport => {
 		proc.stdout.on('data', x => buff += x.toString());
 		await proc.promise;
 		const comm = buff.match(/^[0-9a-f]{40}\s/);
-		if(!comm) throw `no commit hash found for ${config.branch}`;
+		if(!comm)
+			throw new Error(`no commit hash found for ${config.branch}`);
 		const commit = comm[0].trim();
 
 		const zipfile = path.join(ziptmp, 'release.zip');

config.js

@@ -7,19 +7,69 @@ const proto = {};
 const config = Object.create(proto);
 module.exports = config;
 
-const layers = {};
-const layord = 'default conffile gitjson gitlua cmdline'.split(' ');
+const defaults = {
+	conf: path.join(process.env.HOME, '.cdbrelease.json'),
 
-const arrays = ['screenshots', 'tags', 'content_warnings'];
+	srcrepo: undefined,
+	branch: 'master',
+
+	execgit: 'git',
+	exectar: 'tar',
+	execlua: 'lua5.1',
+
+	cdbjson: false,
+	cdbjsonpath: '.cdb.json',
+	cdblua: false,
+	cdbluapath: '.cdbrelease.lua',
+
+	root: 'https://content.minetest.net/api',
+	token: null,
+	timeout: 60,
+
+	user: null,
+	pkg: null,
+
+	version: undefined,
+
+	type: undefined,
+	title: undefined,
+	name: undefined,
+	short_description: undefined,
+	tags: undefined,
+	content_warnings: undefined,
+	license: undefined,
+	media_license: undefined,
+	long_description: undefined,
+	repo: undefined,
+	website: undefined,
+	issue_tracker: undefined,
+	forums: undefined,
+	maintainers: undefined,
+	screenshots: undefined
+};
+
+proto.allowed = {};
+Object.keys(defaults)
+	.forEach(k => proto.allowed[k] = true);
+
+const arrays = [
+	'tags',
+	'content_warnings',
+	'maintainers',
+	'screenshots'
+];
+
+const layers = {};
+const layord = 'conffile gitjson gitlua cmdline'.split(' ');
 
 function set(name, obj) {
 	if(!layord.find(x => x === name))
-		throw Error('invalid config layer name');
+		throw new Error('invalid config layer name');
 	layers[name] = obj;
 
-	Object.keys(config)
-		.forEach(k => delete config[k]);
-	layord.forEach(k => Object.assign(config, layers[k] || {}));
+	Object.assign(config, defaults);
+	layord.forEach(lk => Object.assign(config, layers[lk] || {}));
+	delete config._;
 	arrays.filter(k => config[k] && !Array.isArray(config[k]))
 		.forEach(k => {
 			if((typeof config[k] === 'string' || config[k] instanceof String))
@@ -32,16 +82,3 @@ function set(name, obj) {
 proto.set = set;
 
 set('cmdline', minimist(process.argv.slice(2)));
-
-set('default', {
-	conf: path.join(process.env.HOME, '.cdbrelease.json'),
-	branch: 'master',
-	execlua: 'lua5.1',
-	cdbjsonpath: '.cdb.json',
-	cdbluapath: '.cdbrelease.lua',
-	root: 'https://content.minetest.net/api',
-	token: null,
-	user: null,
-	pkg: null,
-	timeout: 60,
-});

index.js

@@ -59,6 +59,12 @@ function missingConfig(...opts) {
 			.sort();
 		if(missing.length)
 			throw missingConfig(...missing);
+		const excess = Object.keys(config)
+			.filter(k => !config.allowed[k])
+			.sort();
+		if(excess.length)
+			throw new Error(`unsupported options: ${
+				excess.map(JSON.stringify).join(', ')}`);
 
 		await Promise.all([
 			config.edit && cdbedit(),