echo use-standard-socket >> ~/.gnupg/gpg-agent.conf
echo enable-ssh-support >> ~/.gnupg/gpg-agent.conf
$ echo $SSH_AUTH_SOCK
/run/user/1000/gnupg/S.gpg-agent.ssh
$ gpgconf --list-dirs agent-ssh-socket
/run/user/1000/gnupg/S.gpg-agent.ssh
$ systemctl --user show-environment | grep SSH_AUTH_SOCK
SSH_AUTH_SOCK=/run/user/1000/gnupg/S.gpg-agent.ssh
$ cat << EOF > $GNUPGHOME/gpg.conf
use-agent
personal-cipher-preferences AES256 AES192 AES CAST5
personal-digest-preferences SHA512 SHA384 SHA256 SHA224
default-preference-list SHA512 SHA384 SHA256 SHA224 AES256 AES192 AES CAST5 ZLIB BZIP2 ZIP Uncompressed
cert-digest-algo SHA512
s2k-digest-algo SHA512
s2k-cipher-algo AES256
charset utf-8
fixed-list-mode
no-comments
no-emit-version
keyid-format 0xlong
list-options show-uid-validity
verify-options show-uid-validity
with-fingerprint
EOF