extensions/git/src/askpass-main.ts/main
function main(argv: string[]): void {
	if (!process.env['VSCODE_GIT_ASKPASS_PIPE']) {
		return fatal('Missing pipe');
	}

	if (!process.env['VSCODE_GIT_ASKPASS_TYPE']) {
		return fatal('Missing type');
	}

	if (process.env['VSCODE_GIT_ASKPASS_TYPE'] !== 'https' && process.env['VSCODE_GIT_ASKPASS_TYPE'] !== 'ssh') {
		return fatal(`Invalid type: ${process.env['VSCODE_GIT_ASKPASS_TYPE']}`);
	}

	if (process.env['VSCODE_GIT_COMMAND'] === 'fetch' && !!process.env['VSCODE_GIT_FETCH_SILENT']) {
		return fatal('Skip silent fetch commands');
	}

	const output = process.env['VSCODE_GIT_ASKPASS_PIPE'] as string;
	const askpassType = process.env['VSCODE_GIT_ASKPASS_TYPE'] as 'https' | 'ssh';

	// HTTPS (username | password), SSH (passphrase | authenticity)
	const request = askpassType === 'https' ? argv[2] : argv[3];

	let host: string | undefined,
		file: string | undefined,
		fingerprint: string | undefined;

	if (askpassType === 'https') {
		host = argv[4].replace(/^["']+|["':]+$/g, '');
	}

	if (askpassType === 'ssh') {
		if (/passphrase/i.test(request)) {
			// passphrase
			file = argv[6].replace(/^["']+|["':]+$/g, '');
		} else {
			// authenticity
			host = argv[6].replace(/^["']+|["':]+$/g, '');
			fingerprint = argv[15];
		}
	}

	const ipcClient = new IPCClient('askpass');
	ipcClient.call({ askpassType, request, host, file, fingerprint }).then(res => {
		fs.writeFileSync(output, res + '\n');
		setTimeout(() => process.exit(0), 0);
	}).catch(err => fatal(err));
}