Shell script that adds keys to ssh-agent. Options to force a re-injection or set a custom lifetime for the keys. It will scan your .ssh directory for private keys or you can specify a key enumeration file. If your keys need passphrases you will add them during the scripts execution. See: http://blog.jolros.com/post/71467614049/revisiting-my-ssh-…

cs

#!/usr/bin/env bash
read -d '' INSTRUCTIONS << EOF
Checks that the ssh-agent is running, and if not, kick it off

The script will find all private keys in your $HOME/.ssh directory.
You can also create a file called $HOME/.ssh/agentkeys containing 
absolute paths or paths relative to the $HOME/.ssh directory of keys
you wish to add (variables will be expanded).

Options:
  -h:       Prints usage
  -r:       Restarts ssh-agent and re-injects all the keys
  -t HOURS: Number of hours to keep the keys active (default 10)
EOF

KEYTIME="10h"
KEYLISTFILE="${HOME}/.ssh/agentkeys"
RESTART=0

usage(){
    echo "$INSTRUCTIONS"
    exit 1
}

while getopts "hrt:" opt; do
    case "$opt" in
    h|\?) usage
        exit 0
        ;;
    r)  RESTART=1
        ;;
    t)  KEYTIME="${OPTARG}h"
        ;;
    esac
done

if [ $RESTART -eq 1 ]; then
    echo "Restarting ssh-agent"
    killall ssh-agent
    sleep 1
fi

if [[ -z $SSH_AUTH_SOCK ]]; then
   SOCKETFILE=${HOME}/tmp/ssh/ssh-agent.socket
else
   SOCKETFILE=${SSH_AUTH_SOCK}
fi

KEYS=()
if [[ -e "${KEYLISTFILE}" ]]; then
    # Keys in the agentkeys file are absolute or relative to the .ssh directory
    pushd "${HOME}/.ssh/" > /dev/null
    while read; do
        eval KEYSTR="$REPLY"
        case $KEYSTR in
            /*) KEYSTR=$KEYSTR;;
            *) KEYSTR=$PWD/$KEYSTR;;
        esac
        KEYS+=("$KEYSTR")
    done < "${KEYLISTFILE}"
    popd > /dev/null
else
    FOUNDKEYS=$(grep -rl 'BEGIN .* PRIVATE KEY' ${HOME}/.ssh)
    for KEY in $FOUNDKEYS; do
        KEYS+=("$KEY")
    done
fi

if [ ${#KEYS[@]} -eq 0 ]; then
    echo "No keys found to add"
    exit 1
fi

ps -wU ${USER} | grep "[s]sh-agent" > /dev/null
if [[ $? -gt 0 ]]; then
    echo "ssh-agent not running"
    rm -f ${SOCKETFILE}
    ssh-agent -a ${SOCKETFILE} > /dev/null
    chmod 600 ${SOCKETFILE}
    for KEY in "${KEYS[@]}"; do
        ssh-add -t $KEYTIME "${KEY}"
    done
else
    ssh-add -l | grep  "The agent has no identities" > /dev/null
    if [[ $? -eq 0 ]]; then
        echo "ssh-agent running but no keys found. Adding..."
        for KEY in "${KEYS[@]}"; do
            ssh-add -t $KEYTIME "${KEY}"
        done
    else
        echo "ssh-agent running and appropriate keys found"
    fi
fi