Merge branch 'feature/49290_change_superuser_hidden_at_login' into 'master'

Add script to hide superuser, and optionally show custom user login field

See merge request os2borgerpc/os2borgerpc-scripts!135

Author: Marcus Funch

os2borgerpc/login/lightdm_hide_superuser.sh

@@ -0,0 +1,35 @@
+#! /usr/bin/env sh
+
+# Note: /etc/lighdm/users.conf has a setting to hide a user via this line:
+# hidden-users=nobody user2 user3
+# HOWEVER this doesn't work if an AccountService has been installed, and it has on Ubuntu incl. BorgerPC.
+# Hence we change it in the AccountService config instead.
+
+# Reboot or run "systemctl restart lightdm" (which logs you out immediately) for it to take effect.
+
+HIDE_SUPERUSER=$1
+SHOW_CUSTOM_LOGIN_FIELD=$2
+
+CHOSEN_USER="superuser"
+ACCOUNT_SERVICE_SUPERUSER="/var/lib/AccountsService/users/$CHOSEN_USER"
+LIGHTDM_CONFIG="/etc/lightdm/lightdm.conf"
+
+if [ "$HIDE_SUPERUSER" = "True" ]; then
+  FROM="false"
+  TO="true"
+else
+  FROM="true"
+  TO="false"
+fi
+
+sed --in-place "s/SystemAccount=$FROM/SystemAccount=$TO/" $ACCOUNT_SERVICE_SUPERUSER
+
+if [ "$SHOW_CUSTOM_LOGIN_FIELD" = "True" ]; then
+
+  # Idempotency: Don't add it if it's already there
+  if ! grep -q -- "greeter-show-manual-login" "$LIGHTDM_CONFIG"; then
+    sed -i '$ a greeter-show-manual-login=true' $LIGHTDM_CONFIG
+  fi
+else
+  sed -i '/greeter-show-manual-login/d' $LIGHTDM_CONFIG
+fi