Modified gpg-agent upstart script for Ubuntu 14.10 so that it properly sets ssh-agent environment variables

gpg-agent.conf

# This modified version of the gpg-agent.conf script should replace the version in
# /usr/share/upstart/sessions/ on Ubuntu 14.10
#
# Description: Sets SSH_AUTH_SOCK and SSH_AGENT_PID global environment variables if SSH
#              support is enabled in the gpg-agent configuration.
#
# Suggested it as a patch to Ubuntu's gpg2 package via 
# https://code.launchpad.net/~kramsmada/ubuntu/vivid/gnupg2/1407513-gpg-agent-set-ssh-env-vars/+merge/245538
#

description "GPG Agent"
author "Stéphane Graber <[email protected]>"

start on starting xsession-init

pre-start script
    GNUPGHOME=$HOME/.gnupg
    [ -d $GNUPGHOME ] || { stop; exit 0; }
    [ -z "$GPG_AGENT_INFO" ] || { stop; exit 0; }

    grep -qs '^[[:space:]]*use-agent' "$GNUPGHOME/gpg.conf" "$GNUPGHOME/options" || { stop; exit 0; }


    eval "$(gpg-agent --daemon --sh)" >/dev/null
    initctl set-env --global GPG_AGENT_INFO=$GPG_AGENT_INFO
    
    grep -qs "^enable-ssh-support$" "$GNUPGHOME/gpg-agent.conf"

    if [ $? -eq 0 ]; then
        initctl set-env --global SSH_AUTH_SOCK=$SSH_AUTH_SOCK
        initctl set-env --global SSH_AGENT_PID=$SSH_AGENT_PID
    fi    
end script

post-stop script
    GPG_AGENT_PID=$(echo $GPG_AGENT_INFO | cut -d : -f2)
    kill $GPG_AGENT_PID 2>/dev/null || true
    initctl unset-env --global GPG_AGENT_INFO
    
    grep -qs "^enable-ssh-support$" "$GNUPGHOME/gpg-agent.conf"
    
    if [ $? -eq 0 ]; then
        initctl unset-env --global SSH_AUTH_SOCK
        initctl unset-env --global SSH_AGENT_PID
    fi  
end script