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✏️ Editing: 210_raid_layout.sh

# Save the Software RAID layout

if [ -e /proc/mdstat ] &&  grep -q blocks /proc/mdstat ; then
    Log "Saving Software RAID configuration."
    (
        while read array device junk ; do
            if [ "$array" != "ARRAY" ] ; then
                continue
            fi

### Get the actual device node
            if [[ -h $device ]] ; then
                name=${device##*/}
                device=$(readlink -f $device)
            fi

# We use the detailed mdadm output quite a lot
            mdadm --misc --detail $device > $TMP_DIR/mdraid

# fix up layout for RAID10:
            # > near=2,far=1 -> n2
            if [ "$level" = "raid10" ] ; then
                OIFS=$IFS
                IFS=","
                for param in "$layout" ; do
                    copies=${layout%=*}
                    number=${layout#*=}
                    if [ "$number" -gt 1 ] ; then
                        layout="${copies:0:1}$number"
                    fi
                done
                IFS=$OIFS
            fi

ndevices=$( grep "Raid Devices" $TMP_DIR/mdraid | tr -d " " | cut -d ":" -f "2")
            totaldevices=$( grep "Total Devices" $TMP_DIR/mdraid | tr -d " " | cut -d ":" -f "2")
            let sparedevices=$totaldevices-$ndevices

# Find all devices
            # use the output of mdadm, but skip the array itself
            # sysfs has the information in RHEL 5+, but RHEL 4 lacks it.
            devices=""
            for disk in $( grep -o -E "/dev/[^m].*$" $TMP_DIR/mdraid | tr "\n" " ") ; do
                disk=$( get_device_name $disk )
                if [ -z "$devices" ] ; then
                    devices=" devices=$disk"
                else
                    devices="$devices,$disk"
                fi
            done

# prepare for output
            metadata=" metadata=$metadata"
            level=" level=$level"
            ndevices=" raid-devices=$ndevices"
            uuid=" uuid=$uuid"

if [ "$sparedevices" -gt 0 ] ; then
                sparedevices=" spare-devices=$sparedevices"
            else
                sparedevices=""
            fi

if [ -n "$layout" ] ; then
                layout=" layout=$layout"
            else
                layout=""
            fi

if [ -n "$chunksize" ] ; then
                chunksize=" chunk=$chunksize"
            else
                chunksize=""
            fi

if [[ "$name" ]] ; then
                name=" name=$name"
            else
                name=""
            fi

echo "raid ${device}${metadata}${level}${ndevices}${uuid}${name}${sparedevices}${layout}${chunksize}${devices}"

extract_partitions "$device"
        done < <(mdadm --detail --scan --config=partitions)
    ) >> $DISKLAYOUT_FILE

# mdadm is required in the recovery system if disklayout.conf contains at least one 'raid' entry
    # see the create_raid function in layout/prepare/GNU/Linux/120_include_raid_code.sh
    # what program calls are written to diskrestore.sh
    # cf. https://github.com/rear/rear/issues/1963
    grep -q '^raid ' $DISKLAYOUT_FILE && REQUIRED_PROGS+=( mdadm ) || true

MR SKB