Bug#678687: initramfs scripts fail with LABEL= or UUID=

[Rodolfo García Peñas]

Hi,

I think I have a patch. Could you try it? I am not using LVM.

I added a new function in the initramfs script, to change the device given to a 
/dev/mapper device (if exists), so now LVM can boot the resume partition 
independently if is /dev/mapper/x /dev/dm-x or /dev/otherthing. This patch 
supports UUID and LABEL devices, the script translate it to /dev device.

I changed the severity to critical because if LVM cannot handle other devices 
names than /dev/mapper and the image is stored in /dev/dm-x, the system cannot 
boot. The user needs edit the boot configuration and set the flag "noresume", 
else the system won't boot forever.

Cheers,
kix
-- 
 .''`.  Rodolfo García Peñas (kix) <k...@debian.org>
: :'  : Proud Debian Developer
`. `'`  4096R / 3F48 0B8C C385 AD41 9E28  006A 7B1F 5490 72B7 4923
 `-     Debian - when you have better things to do than fixing systems

#!/bin/sh -x

PREREQ="mdadm mdrun multipath"

prereqs()
{
        echo "$PREREQ"
}

case $1 in
# get pre-requisites
prereqs)
        prereqs
        exit 0
        ;;
esac

label_to_dev()
{
        local dev="$1"

        local link1
        local link2

        if [ -d /dev/disk/by-label ]; then
                dev="${dev#LABEL=}"
                if [ "$dev" != "$1" ]; then
                        link1="/dev/disk/by-label/"${dev}
                        if [ -e $link1 ]; then
                                link2=$(readlink -f "$link1")
                                echo $link2
                                return 0
                        fi
                fi
        fi
        
        return 1
}

uuid_to_dev()
{
        local dev="$1"

        local link1
        local link2

        if [ -d /dev/disk/by-uuid ]; then
                dev="${dev#UUID=}"
                if [ "$dev" != "$1" ]; then
                        link1="/dev/disk/by-uuid/"${dev}
                        if [ -e $link1 ]; then
                                link2=$(readlink -f "$link1")
                                echo $link2
                                return 0
                        fi
                fi
        fi
        
        return 1
}

# Get the /dev/mapper device for a /dev given
device_to_mapper()
{
        local dev="$1"

        local link1
        local link2
        local path

        if [ -d /dev/mapper ]; then
                link1=$(readlink -f "$dev")

                for path in /dev/mapper/*; do
                        link2=$(readlink -f "$path")
                        if [ "$link1" = "$link2" ]; then
                                echo "$path"
                                return 0
                        fi
                done
        fi

        return 1
}

activate_vg()
{
        local dev="$1"
        local ndev

        # Make sure that we have a non-empty argument
        if [ -z "$dev" ]; then
                return 1
        fi

        # Take care of lilo boot arg, risky activating of all vg
        case "$dev" in
        fe[0-9]*)
                lvm vgchange -aly --ignorelockingfailure
                exit 0
                ;;
        # FIXME: check major
        /dev/root)
                lvm vgchange -aly --ignorelockingfailure
                exit 0
                ;;
        esac

        # Make sure that we have a d-m path
        ndev=$(label_to_dev "$dev")
        if [ $? = 0 ]; then
                dev=$ndev
        fi

        ndev=$(uuid_to_dev "$dev")
        if [ $? = 0 ]; then
                dev=$ndev
        fi

        ndev=$(device_to_mapper "$dev")
        if [ $? != 0 ]; then
                return 1
        fi

        eval $(dmsetup splitname --nameprefixes --noheadings --rows "$ndev")

        if [ "$DM_VG_NAME" ] && [ "$DM_LV_NAME" ]; then
                lvm lvchange -aly --ignorelockingfailure 
"$DM_VG_NAME/$DM_LV_NAME"
                rc=$?
                if [ $rc = 5 ]; then
                        echo "Unable to find LVM volume $DM_VG_NAME/$DM_LV_NAME"
                fi
        fi
}

if [ ! -e /sbin/lvm ]; then
        exit 0
fi

modprobe -q dm-mod

activate_vg "$ROOT"
activate_vg "$resume"

exit 0

signature.asc
Description: Digital signature