# Based on ssh-agent code

local GPG_ENV=$HOME/.gnupg/gpg-agent.env

function start_agent {
  /usr/bin/env gpg-agent --daemon --enable-ssh-support --write-env-file ${GPG_ENV} > /dev/null
  chmod 600 ${GPG_ENV}
  . ${GPG_ENV} > /dev/null
}

# Source GPG agent settings, if applicable
if [ -f "${GPG_ENV}" ]; then
  . ${GPG_ENV} > /dev/null
  ps -ef | grep ${SSH_AGENT_PID} | grep gpg-agent > /dev/null || {
    start_agent;
  }
else
  start_agent;
fi

export GPG_AGENT_INFO
export SSH_AUTH_SOCK
export SSH_AGENT_PID

GPG_TTY=$(tty)
export GPG_TTY

local GPG_ENV=$HOME/.gnupg/gpg-agent.env

function start_agent_nossh {
    eval $(/usr/bin/env gpg-agent --daemon --write-env-file ${GPG_ENV}) > /dev/null
    export GPG_AGENT_INFO
}

function start_agent_withssh {
    eval $(/usr/bin/env gpg-agent --daemon --enable-ssh-support --write-env-file ${GPG_ENV}) > /dev/null
    export GPG_AGENT_INFO
    export SSH_AUTH_SOCK
    export SSH_AGENT_PID
}

# make sure all created files are u=rw only
umask 177

# source settings of old agent, if applicable
if [ -f "${GPG_ENV}" ]; then
  . ${GPG_ENV} > /dev/null
fi

# check for existing ssh-agent
if ssh-add -l > /dev/null 2> /dev/null; then
    start_agent_nossh;
else
    start_agent_withssh;
fi

GPG_TTY=$(tty)
export GPG_TTY

Disable ssh-agent support if another ssh-agent is already running.
Disable ssh-agent support if another ssh-agent is already running.
