Ssh-agent xonsh integration.
Install using pip
pip install xontrib-ssh-agent
Add to your .xonshrc:
xontrib load ssh_agent
This xontrib launches ssh-agent when xonsh is started if it isn't already running, and sets the required environment variables.
By issuing the ssh command it checks for added identities, and if there's none it adds them via the ssh-add command.
To handle ssh identities, repassh is used under the hood. If it's on the $PATH, xontrib-ssh-agent sets $GIT_SSH to it by default. If your repassh command is not on the $PATH by default, but you still want to use it for git, then set $GIT_SSH to it manually, or set $REPASSH_COMMAND before you load this xontrib.