import sys
import errno
import stat
from fuse import FUSE, Operations

class HelloWorld(Operations):
    def getattr(self, path, fh=None):
        if path == '/' or path == '/hello':
            return {
                'st_mode': stat.S_IFREG | 0o444,  # Regular file, read-only
                'st_nlink': 1,
                'st_size': len("hello world"),
            }
        else:
            raise OSError(errno.ENOENT, '')

    def readdir(self, path, fh):
        return ['.', '..', 'hello']

    def open(self, path, flags):
        if path != '/hello':
            raise OSError(errno.ENOENT, '')

    def read(self, path, size, offset, fh):
        if path == '/hello':
            return b"hello world"[offset:offset + size]
        else:
            raise OSError(errno.ENOENT, '')

def main(mountpoint):
    FUSE(HelloWorld(), mountpoint, nothreads=True, foreground=True)

if __name__ == '__main__':
    if len(sys.argv) != 2:
        print(f'Usage: {sys.argv[0]} <mountpoint>')
        sys.exit(1)

    main(sys.argv[1])