Dear Marco, here is the patched version of the script. Basically if we can't find the root device with udev, we try to find it by parsing /proc/cmdline. If that is not a valid block device the script exists, if it is that device is used for the /dev/root symlink.
Ciao, Paride
#!/bin/sh -e
RUNDIR=$(udevadm info --run || exit 0)
[ -d $RUNDIR ] || exit 0
mkdir -p $RUNDIR/rules.d/
[ ! -e $RUNDIR/rules.d/61-dev-root-link.rules ] || exit 0
eval $(udevadm info --export --export-prefix=ROOT_ --device-id-of-file=/ ||
true)
[ "$ROOT_MAJOR" -a "$ROOT_MINOR" ] || exit 0
# btrfs filesystems have bogus major/minor numbers
if [ "$ROOT_MAJOR" != 0 ]; then
echo 'ACTION=="add|change", SUBSYSTEM=="block",
ENV{MAJOR}=="'$ROOT_MAJOR'", ENV{MINOR}=="'$ROOT_MINOR'", \
SYMLINK+="root"' > $RUNDIR/root-link-rule
else
# btrfs filesystems have bogus major/minor numbers,
# let's try to infer the root device from /proc/cmdline
DEVNAME=`cat /proc/cmdline`
DEVNAME=${DEVNAME##*root=}
DEVNAME=${DEVNAME%% *}
DEVNAME=${DEVNAME##*/}
# If $DEVNAME is not a valid block device then exit now.
if [ ! -b "$DEVNAME" ]; then
exit 0
fi
echo 'ACTION=="add|change", SUBSYSTEM=="block", KERNEL=="'$DEVNAME'",
SYMLINK+="root"' > $RUNDIR/root-link-rule
fi
mv $RUNDIR/root-link-rule $RUNDIR/rules.d/61-dev-root-link.rules
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