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I have a script running on a remote host through ssh, processing stdin from the host.

That is the script does something like this (to simplify):

cat $TARBALL | ssh $REMOTE 'tar -x -C -f - && reboot'

This work fine if I use root as the ssh user, but if I don't have root access on the REMOTE, I want to execute the command with sudo instead, eg:

cat $TARBALL | ssh $REMOTE 'sudo tar -x -C -f - && sudo reboot'

I would want the user to be asked the password interactively here, but sudo can't get the password in that situation.

How can I somehow instruct sudo to ask for the password on the local terminal? Seems like the -A option could enable this, but I can't figure what askpass program I might need in this case.

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When you have to deal with passwords prompts on standart input, the recommanded Unix way is to use the expect(1) tool which was made specially for that purpose.

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    How does expect help here? sudo won't have a prompt on stdout and stdin is used to provide other data – Droopycom May 8 at 2:09

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