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xpra-sudo

xpra-sudo is a wrapper script for Xpra that allows running the server as a different user on the same system using sudo.

Installation

Just copy both scripts (xpra-sudo and xpra-sudo-ssh) to a directory in your PATH. If you don't want xpra-sudo-ssh to mess up your path, you can also place it somewhere else and set the variable SSH_HELPER in xpra-ssh accordingly.

Usage

To start an Xpra session as user user, just run this command:

xpra-sudo start sudo:user:42 --start-child=urxvt

How does it work?

Xpra already supports connecting via SSH and xpra-sudo uses this mechanism: it passes xpra-sudo-ssh as a custom SSH command to Xpra using the --ssh option and changes sudo:user:42 to ssh:user@localhost+sudo:42. xpra-sudo-ssh then recognizes the special hostname localhost+sudo and uses sudo instead of SSH to run the command.

How does that sudoers syntax work again?

xpra-sudo works fine without the NOPASSWD option in sudo, but you might nonetheless set it for your convenience and don't remember the syntax? Here's my service for you, this allows the user julian to run commands as user:

julian ALL=(user) NOPASSWD: ALL