99base/init: fall back to manual cdrom polling

modules.d/99base/init

@@ -230,14 +230,17 @@ while :; do
     # some time.
     for cdrom in /sys/block/sr*; do
         [ -e "$cdrom" ] || continue 
-        if [ -e "$cdrom"/events_poll_msecs ]; then
-            msecs=$(while read a; do echo $a;done < "$cdrom"/events_poll_msecs)
-            [ "$msecs" = "-1" ] && \
-                echo 1000 > "$cdrom"/events_poll_msecs
-        else
         # skip, if cdrom medium was already found
         strstr "$(udevadm info --query=env --path=${cdrom##/sys})" \
             ID_CDROM_MEDIA && continue
+
+        if [ -e "$cdrom"/events_poll_msecs -a -n -e "/tmp/.poll_${cdrom##*/}" ]; then
+            msecs=$(while read a; do echo $a;done < "$cdrom"/events_poll_msecs)
+            if [ "$msecs" = "-1" ]; then
+                echo 250 > "$cdrom"/events_poll_msecs
+                > "/tmp/.poll_${cdrom##*/}"
+            fi
+        else
             echo change > "$cdrom/uevent"
         fi
     done