Commit 5df50bb7 authored by intrigeri's avatar intrigeri
Browse files

Ensure we bring the amnesia user's desktop session into the foreground after killing GDM.

parent 081c1029
......@@ -9,6 +9,35 @@ set -e
set -u
set -x
. /etc/live/config.d/username.conf
# Returns the identifier of the first X11 session of $LIVE_USERNAME.
# In this context, we know that:
# - There is one such session: we're run via, which is started
# after GDM has logged in $LIVE_USERNAME and pam_systemd has allocated them
# a logind session.
# - There's no more than one such session: our Greeter/GDM integration code
# allows only one graphical login.
live_user_logind_x_session_id() {
# The value of the Sessions property is a space-separated list
# of session identifiers
for session in $(loginctl --property=Sessions --value show-user "$LIVE_USERNAME"); do
if [ "$(loginctl --property=Type --value show-session $session)" = 'x11' ]; then
loginctl --property=Id --value show-session "$session"
return 0
echo "Unexpected error: no X11 session for ${LIVE_USERNAME}" >&2
return 1
logind_session_tty_number() {
loginctl --property=TTY --value show-session "$session" \
| sed -E 's,^tty,,'
# Ensure gdm-session-worker won't start new sessions.
cp -a /bin/true /usr/lib/gdm3/gdm-session-worker
......@@ -21,3 +50,17 @@ pkill -u root --full --exact 'gdm-session-worker \[pam/gdm-launch-environment\]'
# in case the former command was not enough.
loginctl --signal SIGKILL kill-user Debian-gdm || true
loginctl terminate-user Debian-gdm || true
# Activate the amnesia user's desktop session, in case we've killed
# the Debian-gdm session before GDM had time to do so; do this
# repeatedly for about 10 seconds, in case GDM take back control of
# the seat and switches back to VT1, after we've already activated
# amnesia's session and switched to VT2, because its own session was killed.
while [ $tries -lt 10 ]; do
chvt "$(logind_session_tty_number $LIVE_USER_LOGIND_X_SESSION_ID)"
loginctl activate "$LIVE_USER_LOGIND_X_SESSION_ID"
tries=$(expr $tries + 1)
sleep 1
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