features.in/live: implemented lightdm autologin

The main part is done as per
https://wiki.archlinux.org/index.php/LightDM#Enable_Autologin;
there's an issue that the lightdm developer insist that autologin
user belongs to "nopasswdlogin" group though.

features.in/live/live/image-scripts.d/30-users

@@ -1,7 +1,10 @@
-#!/bin/sh
+#!/bin/sh -x
 # * reset password for root
 # * add user `altlinux' (without password)
 
+NPG="nopasswdlogin"
+GRPLIST="users scanner audio radio proc cdrom cdwriter wheel fuse $NPG"
+
 verbose()
 {
     if [ -n "$GLOBAL_VERBOSE" ]; then
@@ -12,8 +15,9 @@ verbose()
 add_user()
 {
     verbose "Add $1 user"
+    groupadd -r "$NPG"
     local groups=
-    for g in users scanner audio radio proc cdrom cdwriter wheel fuse; do
+    for g in $GRPLIST; do
 	if groupmod $g 2>/dev/null; then
 	    if [ -n "$groups" ]; then
 		groups="$groups,$g"

features.in/live/live/image-scripts.d/40-autologin

@@ -22,6 +22,15 @@ AUTOLOGIN=yes
 E_O_F
 fi
 
+# lightdm autologin
+LIGHTDM_CONF=/etc/lightdm/lightdm.conf
+if [ -f "$LIGHTDM_CONF" ]; then
+	sed -i \
+		-e "s/^#\(autologin-user=\).*$/\1$USER/" \
+		-e "s/^#\(autologin-user-timeout=0\)/\1/" \
+		"$LIGHTDM_CONF"
+fi
+
 # gdm2 autologin
 GDM_CONF=/etc/X11/gdm/custom.conf
 if [ -f "$GDM_CONF" ]; then