shell=bash
disable=SC1090  # Not fixable (ever?)
disable=SC1090  # not really fixable usually (ever?)
disable=SC2034  # for localizing variables set in called functions
disable=SC2128  # intentional style choice
disable=SC2206  # suggested alternatives fail in posix mode or use temp files
disable=SC2207  # suggested alternatives fail in posix mode or use temp files

    # Check if ssh-add is installed
if [ ! -x "$(which ssh-add)" ] ; then
    echo "ssh-add is not available; agent testing aborted";
    return 1;
fi


    # SSH_AUTH_SOCK param is necessary
if [ -n "$1" ] ; then
    export SSH_AUTH_SOCK=$1;
    else
            return 2;
fi

    # Try to connect to ssh-agent via ssh-add
if [ -S $SSH_AUTH_SOCK ] ; then
    ssh-add -l > /dev/null
    if [ $? = 2 ] ; then
        echo "Deleting $SSH_AUTH_SOCK because it no longer exists..."
        rm -f $SSH_AUTH_SOCK
        return 4
    else
        echo "Found working ssh-agent $SSH_AUTH_SOCK"
        return 0
    fi
else
    echo "$SSH_AUTH_SOCK is not a socket!"
    return 3
fi

AGENTFOUND=0

# If the ssh-agent env vars are set, we do not need to do anything
if sshagent_testsocket ; then AGENTFOUND=1 ; fi

# Try to connect to any running ssh-agent while deleted invalid ones
if [ $AGENTFOUND = 0 ] ; then
    for agentsocket in $(sshagent_findsockets) ; do
        if [ $AGENTFOUND != 0 ] ; then break ; fi
        if sshagent_testsocket $agentsocket ; then AGENTFOUND=1 ; fi
    done
fi

# No running ssh-agent could be found -> start a new one
if [ $AGENTFOUND = 0 ] ; then
    eval `ssh-agent`;
fi

    # always add missing keys from ~/.ssh/
    add_keys;

# Clean up
unset AGENTFOUND
unset agentsocket

# Finally, show what keys are currently in the agent
ssh-add -l