.bashrc ssh-agent script for WSL Ubuntu

.bashrc

# Location where ssh-agent settings are persisted
SSH_ENV="$HOME/.ssh/environment"

# Start ssh-agent and persist its settings
function start_agent {
    echo "Initializing new SSH agent..."
    touch $SSH_ENV
    chmod 600 "${SSH_ENV}"
    /usr/bin/ssh-agent | sed 's/^echo/#echo/' > "${SSH_ENV}"
    . "${SSH_ENV}" > /dev/null
    /usr/bin/ssh-add
}

# If there are existing SSH_ENV settings and ssh-agent is still running then leave it alone, otherwise start it
if [ -f "${SSH_ENV}" ]; then
    . "${SSH_ENV}" > /dev/null
    kill -0 $SSH_AGENT_PID 2>/dev/null || {
        start_agent
    }
else
    start_agent
fi

This is modified from https://stackoverflow.com/a/45562886/795690