Fabric: how to run sudo() in cd() context?

Question

Python

from invoke import task

@task
def do(c):
    with c.cd('/opt'):
        c.run('pwd')  # OK: "/opt"
        c.sudo('pwd')  # ERROR:  "sudo: cd: command not found"

I run it like this: fab -H [email protected]:port --prompt-for-sudo-password
do "cd" is not a program but a pure bash command, and c.sudo in context turns it into "sudo cd && sudo pwd". But there is no solution to come up with. Please help.