deflogin: add variable DEFAULT_SESSION (for AccountsService)

features.in/deflogin/config.mk

@@ -8,6 +8,7 @@ use/deflogin:
 	@$(call xport,GROUPS)
 	@$(call xport,SPEC_USER)
 	@$(call xport,LIVE_USER)
+	@$(call xport,DEFAULT_SESSION)
 
 # some presets
 # USERS variable chunk format is "login:passwd:admin:sudo"

features.in/deflogin/rootfs/image-scripts.d/60-default-session

+#!/bin/sh
+
+account_dir=/var/lib/AccountsService/users
+
+[ -d /var/lib/AccountsService/users ] || exit 0
+[ -n "$GLOBAL_USERS" ] || exit 0
+[ -n "$GLOBAL_DEFAULT_SESSION" ] || exit 0
+
+if [ -f /usr/share/wayland-sessions/"$GLOBAL_DEFAULT_SESSION".desktop ]; then
+	sesion_type=Session
+elif [ -f /usr/share/xsessions/"$GLOBAL_DEFAULT_SESSION".desktop ]; then
+	sesion_type=XSession
+else
+	echo "$GLOBAL_DEFAULT_SESSION.desktop is not found" >&2
+	exit 1
+fi
+
+for user in $GLOBAL_USERS; do
+	user="${user%%:*}"
+	cat > "$account_dir"/"$user"<<-EOF
+	[User]
+	$sesion_type=$GLOBAL_DEFAULT_SESSION
+	EOF
+	cat "$account_dir"/"$user"
+done