/etc/X11/Xsession.d/90gpg-agent is in gnupg-agent 2.0.22-3ubuntu1.
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 | : ${GNUPGHOME=$HOME/.gnupg}
GPGAGENT=/usr/bin/gpg-agent
PID_FILE="$GNUPGHOME/gpg-agent-info-$(hostname)"
if grep -qs '^[[:space:]]*use-agent' "$GNUPGHOME/gpg.conf" "$GNUPGHOME/options" &&
test -x $GPGAGENT &&
{ test -z "$GPG_AGENT_INFO" || ! $GPGAGENT 2>/dev/null; }; then
if [ -r "$PID_FILE" ]; then
. "$PID_FILE"
fi
# Invoking gpg-agent with no arguments exits successfully if the agent
# is already running as pointed by $GPG_AGENT_INFO
if ! $GPGAGENT 2>/dev/null; then
STARTUP="$GPGAGENT --daemon --sh --write-env-file=$PID_FILE $STARTUP"
fi
fi
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