/etc/X11/Xsession.d/90gpg-agent is in gnupg-agent 2.1.18-8~deb9u4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | # On systems with systemd running, we expect the agent to be launched
# via systemd's user mode (see
# /usr/lib/systemd/user/gpg-agent.{socket,service} and
# systemd.unit(5)). This allows systemd to clean up the agent
# automatically at logout.
# If systemd is absent from your system, or you do not permit it to
# run in user mode, then you may need to manually launch gpg-agent
# from your session initialization with something like "gpgconf
# --launch gpg-agent"
# Nonetheless, ssh and older versions of gpg require environment
# variables to be set in order to find the agent, so we will set those
# here.
agent_sock=$(gpgconf --list-dirs agent-socket)
export GPG_AGENT_INFO=${agent_sock}:0:1
if [ -n "$(gpgconf --list-options gpg-agent | \
awk -F: '/^enable-ssh-support:/{ print $10 }')" ]; then
export SSH_AUTH_SOCK=$(gpgconf --list-dirs agent-ssh-socket)
fi
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