A while ago, I started using keychain to manage my ssh and gpg agents. I did this with the following in my .bashrc
# Start ssh-agent
eval $(keychain --quiet --eval id_rsa)
Recently, arch updated gpg to version 2.1.1 which, as per the announcement, no longer requires the GPG_AGENT_INFO environment variable.
Unfortunately, tools like keychain don't know about that and still expect it to be set, leading to some annoying breakage.
My fix is a quick and dirty one; I appended the following to .bashrc
export GPG_AGENT_INFO=~/.gnupg/S.gpg-agent:$(pidof gpg-agent):1
:)