grml2ram: switch default mount point from /lib/live/mount/medium to /run/live/medium

In commit 0d878d3a679 of live-boot(-grml)
("Simplify mount point handling by using /run/live instead of /lib/live/mount")
the mountpath of /lib/live/mount/medium was moved towards /run/live/medium.

Commit c6a17c7b41b of live-boot(-grml) provides a backward compatibility
rbind mount, but occasionally there seems to be a regression somewhere
during boot (see https://github.com/grml/live-boot-grml/issues/10), and
the rbind mount will be deprecated and removed before the bullseye
(Debian 11) release.

Layout changes over time:

* /cdrom for old linuxrc approach
* /live/image for initramfs layout until December 2012
* /lib/live/mount/medium for initramfs layout since December 2012
* /run/live/medium for initramfs layout since December 2018

Drop support for everything but /run/live/medium and
/lib/live/mount/medium, while at it.

diff --git a/usr_sbin/grml2ram b/usr_sbin/grml2ram
index 37c36a3..3482bdb 100755 (executable)
--- a/usr_sbin/grml2ram
+++ b/usr_sbin/grml2ram
@@ -19,12 +19,10 @@ if ! isgrmlcd ; then
    exit 1
 fi
 
-# old linuxrc version:
-[ -d /cdrom ]      && export LIVECD_PATH=/cdrom
-# initramfs layout until around December 2012:
-[ -d /live/image ] && export LIVECD_PATH=/live/image
-# initramfs layout since around December 2012:
-[ -d /lib/live/mount/medium ] && export LIVECD_PATH=/lib/live/mount/medium
+# initramfs layout since December 2012, backwards compatibility:
+[ -d /lib/live/mount/medium ] && export LIVECD_PATH='/lib/live/mount/medium'
+# initramfs layout since December 2018:
+[ -d /run/live/medium ] && export LIVECD_PATH='/run/live/medium'
 
 if [ -z "$CMDLINE" ]; then
   # if CMDLINE was set from the outside, we're debugging.