Working on Ubuntu 20.04 LTS

SSH agent for WSL

#!/bin/bash

echo "SSH agent init script"

env=~/.ssh/agent.env

agent_load_env () { test -f "$env" && . "$env" >| /dev/null ; }

agent_start () {
    echo "Starting new SSH agent"

    (umask 077; ssh-agent >| "$env")
    . "$env" >| /dev/null ;
}

agent_load_env

# agent_run_state: 0=agent running w/ key; 1=agent w/o key; 2= agent not running
agent_run_state=$(ssh-add -l >| /dev/null 2>&1; echo $?)

# echo "Agent run state: ${agent_run_state}"
# echo "Auth sock: ${SSH_AUTH_SOCK}"

if [ ! "$SSH_AUTH_SOCK" ] || [ $agent_run_state = 2 ]; then
    agent_start
    find ~/.ssh/ -type f -exec grep -q "PRIVATE KEY" {} \; -print | xargs -d '\n' ssh-add
elif [ "$SSH_AUTH_SOCK" ] && [ $agent_run_state = 1 ]; then
    ssh-add
fi

export SSH_AUTH_SOCK

unset env

echo "SSH agent was loaded"

This SSH agent configuration working with multiple tabs in microsoft/terminal app. Important part is export SSH_AUTH_SOCK to share variables between tabs.

If you are calling like separate script in ~/.bashrc do not forget to call it like: source ./scripts/ssh_agent.sh.