ssh-agent helper

ssh-agent-helper.sh

#!/bin/bash

# ssh-agent helper script. runs ssh-agent and adds ~/.ssh/*.pem keys

PATH="/bin:/usr/bin"
umask 077
IFS='   '

readonly AGENT_SOCKET="${HOME}/.ssh/.ssh-agent-socket"
readonly AGENT_INFO="${HOME}/.ssh/.ssh-agent-info"
if [[ -s "$AGENT_INFO" ]]
then
    source "$AGENT_INFO"
fi

RUN_PID="$(ps -ef | grep '[s]sh-agent' | awk '{print $2}')"

if [[ -z "$SSH_AGENT_PID" || "$SSH_AGENT_PID" != $RUN_PID ]]
then
    if [[ -S "$AGENT_SOCKET" ]]
    then
        echo "[WARN] - socket file exists but agent is not running - removing socket file" >&2
        rm -i "$AGENT_SOCKET"
    fi
    eval $(ssh-agent -s -a "$AGENT_SOCKET")
    echo "export SSH_AGENT_PID=${SSH_AGENT_PID}" > "$AGENT_INFO"
    echo "export SSH_AUTH_SOCK=${SSH_AUTH_SOCK}" >> "$AGENT_INFO"
    for file in $(echo "${HOME}/.ssh/"*.pem)
    do
        ssh-add "$file"
    done
else
    echo "[INFO] - agent already running" >&2
fi