source: MondoRescue/branches/3.2/mondo/src/restore-scripts/mondo/label-partitions-as-necessary@ 3437

#!/bin/sh
#
# $Id: label-partitions-as-necessary 3437 2015-08-28 14:08:48Z bruno $
#
############################################


read_partition_line() {
    local label mountpt command format device d m

    device=`echo "$1" | awk '{print $1}'`
    d=`echo "$device" | cut -c1`
    format=`echo "$1" | awk '{print $3}'`
    label=`echo "$device" | cut -s -d'=' -f2`
    if [ "$d" = "/" ] && [ "$label" = "" ]; then
        m=`echo "$1" | awk '{print $2}'`
        # We force UUID even if nothing in fstab as some new distro like RHEL7 rely on it
        [ "$format" = "reiserfs" ] && opttun="-u" || opttun="-U"
        label=`awk '{print $2,$5}' $mountlist | grep -E "^$m " | awk '{print $2}'`
    else
        if [ "`echo "$1" | grep -E 'LABEL='`" != "" ] ; then
            [ "$format" = "reiserfs" ] && opttun="-l" || opttun="-L"
        elif [ "`echo "$1" | grep -E 'UUID='`" != "" ] ; then
            [ "$format" = "reiserfs" ] && opttun="-u" || opttun="-U"
        else
            LogIt "Nothing to do on $1"
            return
        fi
    fi
    mountpt=`awk '{print $1,$5}' $mountlist | grep " $label$" | awk '{print $1}'`

    if [ ! "$mountpt" ] ; then
        LogIt "Not labeling anything as ($label) because ($mountpt) is not a mountpoint"
    elif [ ! "$label" ] ; then
        LogIt "Not labeling ($mountpt) as anything because ($label) is not a label/uuid"
    else
        if [ "$format" = "ext2" ] || [ "$format" = "ext3" ] || [ "$format" = "ext4" ]; then
            if [ "$format" = "ext4" ] && [ -x "/sbin/tune4fs" ]; then
                command="/sbin/tune4fs $opttun $label $mountpt"
            else
                command="tune2fs $opttun $label $mountpt"
            fi
            LogIt "Running $command"
            $command
        elif [ "$format" = "reiserfs" ]; then
            command="reiserfstune $opttun $label $mountpt"
            LogIt "Running $command"
            $command
        elif [ "$format" = "btrfs" ]; then
            # Also see https://btrfs.wiki.kernel.org/index.php/Project_ideas#Filesystem_UUID_change_-_off-line
            command="btrfs filesystem label $mountpt $label"
            LogIt "Running $command"
            $command
        elif [ "$format" = "xfs" ]; then
            command="xfs_admin $opttun $label $mountpt"
            LogIt "Running $command"
            $command
        elif [ "$format" = "swap" ] ; then
            if [ "$opttun" = "-U" ]; then
                typelabel="UUID"
            else
                typelabel="Label"
            fi
            if [ -x "/sbin/swaplabel" ]; then
                # Better choice
                command="/sbin/swaplabel $opttun $label $mountpt"
            else
                if [ "$opttun" = "-U" ]; then
                    LogIt "Really running dd conv=notrunc of=$mountpt obs=1 seek=1036"
                    echo -n "$label" | perl -ne 's/-//g;chomp;print pack "H*",$_' | dd conv=notrunc "of=$mountpt" obs=1 seek=1036
                    command=/bin/true
                else
                    command="mkswap -f $opttun $label $mountpt"
                fi
            fi
            LogIt "Creating $typelabel $label on swap partition $mountpt"
            LogIt "Running $command"
            $command
        else
            LogIt "I am NOT going to run tune2|4fs/reiserfstune: the partition is format '$format', which doesn't like tune2|4fs/reiserfstune anyway"
        fi
    fi
}


# ---------------------------------------------

LogIt "Identifying your drives with FS tune tool"
if [ "$#" -ne "1" ] ; then
    LogIt "label-partitions-as-necessary /tmp/mountlist.txt < /tmp/fstab.new" 1
    exit 1
fi
mountlist=$1
noof_blank_lines=0
read line
# We end after 50 empty lines, which hopefully means we reach the end of the file
while [ "$noof_blank_lines" -le "50" ] ; do
    if [ "$line" = "" ] ; then
        noof_blank_lines=$(($noof_blank_lines+1))
    else
        noof_blank_lines=0
        read_partition_line "$line"
    fi
    read line
done
LogIt "Labeling complete."
exit 0