Auto-detect the current user's SSH agent

auto-detect-ssh-agent.sh

#!/bin/bash
#
# Sets environment to automatically find the current user's SSH agent


# Echoes to stdout the PID of the process with a particular command line
function pid_of_command {
  local command="$1"

  ps -u "$(whoami)" \
    | grep "$command" \
    | grep -v grep \
    | awk '{print $2}' \
    | head -n 1
}

# The PID of the current user's SSH agent
function ssh_agent_pid {
  pid_of_command ssh-agent
}

# Lists the path to the SSH auth file for the current SSH agent
function ssh_agent_socket {
  lsof -p "$(ssh_agent_pid)" \
    | grep 'unix' \
    | awk '{print $8}'
}

function main {
  export SSH_AUTH_SOCK="$(ssh_agent_socket)"
  export SSH_AGENT_PID="$(ssh_agent_pid)"
}

main