mdadm/mkinitrd-setup.sh

#!/bin/bash
#
#%stage: softraid
#
mdblockdev=

# Full mdadm.conf generated by mdadm.
# Contains all created MD RAIDs
mdadm_conf=$(mdadm --examine --brief --scan)

cont_list=
md_devs=

# blockdev contains real devices (/dev/X) for root, resume, journal, dumb
echo "blockdev: $blockdev"
for bd in $blockdev ; do
    is_part_dev=false
    case $bd in
	/dev/md[0-9]*p[0-9]*)
	    # Partitionable MD RAID. This is partition on RAID. Get the RAID
	    bd=${bd%%p[0-9]*}
	    is_part_dev=true
	    ;;
	/dev/md[0-9]*)
	    ;;
	*)
	    mdblockdev="$mdblockdev $bd"
	    continue
	    ;;
    esac
    # Check if this device is already added (possible for partitionable).
    md_dev=${bd##/dev/}
    dup_found=false
    for dup in $md_devs; do
	if [ x"$dup" = x"$md_dev" ]; then
	    dup_found=true
	    break
	fi
    done
    if $dup_found; then
	if ! $is_part_dev; then
	    echo "setup-md.sh: $md_dev found multiple times" >&2
	fi
        continue
    fi
    # Get UUID of block device
    tmp_uuid=$(mdadm -D $bd --export 2>/dev/null | grep UUID=)
    if [ -n "$tmp_uuid" ]; then
	md_tmpblockdev=$(mdadm -Dbv $bd 2> /dev/null | sed -n "1D;s/,/ /g;s/^ *devices=\(.*\)/\1/p")
	uuid=${tmp_uuid##MD_}
	# Get the corresponding line from config
	arr_line=$(echo "$mdadm_conf" | grep "$uuid")
	if test -z "$arr_line"; then
	    continue
	fi
	# Check for container
	cont_line=
	cont=$(echo "$arr_line" | sed -n "s/.*container=\([0-9a-z]\{8\}:[0-9a-z]\{8\}:[0-9a-z]\{8\}:[0-9a-z]\{8\}\).*/\1/p")
	if [ -n "$cont" ]; then
	    cnt_dup=0
	    for cnt in $cont_list; do
		if [ x"$cont"= x"$cnt" ]; then
		    cnt_dup=1
		fi
	    done
	    if [ $cnt_dup -eq 0 ]; then
		cont_list="$cont_list $cont"
		cont_line=$(echo "$mdadm_conf" | grep "UUID=$cont")
		cont_line="$cont_line\n"
	    fi
	fi
	# add a line with the "real" md device name so that boot-md.sh finds it
	cfg_dev=$(echo "$arr_line" | sed -rn 's/^ARRAY +([^ ]*).*/\1/p; T; q')
	real_dev=$(readlink -f "$cfg_dev")
	if test -n "$real_dev" -a "$real_dev" != "$cfg_dev"; then
	    arr_line="$arr_line$(echo -e "\\n$arr_line" | \
		sed -r "s:^(ARRAY +)$cfg_dev:\\1$real_dev:")"
	fi
	mdblockdev="$mdblockdev $md_tmpblockdev"
	# Add ARRAY line (with container line before if needed).
	cfg_line=$(echo -e "$cont_line$arr_line")
	eval md_conf_${md_dev}=\""$cfg_line"\"
	md_devs="$md_devs $md_dev"
	root_md=1
    fi
done

# Any 'md' device is replaced by it's component disks.
blockdev="$mdblockdev"

if [ -n "$root_md" ] ; then
    need_mdadm=1
    echo -n "" > $tmp_mnt/etc/mdadm.conf
    for md in $md_devs; do
        eval echo -e \"\$md_conf_$md\" >> $tmp_mnt/etc/mdadm.conf
    done
fi

save_var need_mdadm
save_var root_md