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# # Verify some known things in the recreated disk layout that could go wrong # cf. https://github.com/rear/rear/pull/2702#issuecomment-971331028 # # Verify RAID devices are actually recreated with the UUIDs in disklayout.conf # because mdadm silently ignores this option when creating IMSM arrays # (both containers and the volumes inside them) and picks a random UUID # cf. https://github.com/rear/rear/pull/2702#issuecomment-970395567 # Get recreated RAID devices. # lsblk lists RAID devices with '*_raid_member' FSTYPE values # e.g. 'linux_raid_member' or 'isw_raid_member' - for the latter # see https://github.com/rear/rear/pull/2702#issuecomment-968904230 local name kname fstype uuid local uuid_alnum_lowercase lsblk -nrpo NAME,KNAME,FSTYPE,UUID | grep '_raid_member' | while read name kname fstype uuid ; do # Check recreated RAID device UUID: if test $uuid ; then # When there is a recreated RAID device with UUID # we grep for 'raidarray' entries in disklayout.conf that contain this UUID and # if found things are considered to be OK because UUIDs must be unique # so it cannot happen that a different device also has this UUID # i.e. we omit to check if the found UUID matches this RAID device. # 'raidarray' entries in disklayout.conf contain RAID UUIDs like (excerpts) # raidarray /dev/md127 uuid=8d05eb84:2de831d1:dfed54b2:ad592118 devices=/dev/sda,/dev/sdb # but lsblk shows that UUID as 8d05eb84-2de8-31d1-dfed-54b2ad592118 # so we make uuid_alnum_lowercase=8d05eb842de831d1dfed54b2ad592118 # and make the 'raidarray' entries alphanumeric lowercase characters plus spaces and '=' characters # raidarray devmd127 uuid=8d05eb842de831d1dfed54b2ad592118 devices=devsdadevsdb # where we can grep for "uuid=$uuid_alnum_lowercase": uuid_alnum_lowercase="$( echo "$uuid" | tr -d -c '[:alnum:]' | tr '[:upper:]' '[:lower:]' )" if ! grep "^raidarray " $LAYOUT_FILE | tr -d -c '[:alnum:] =' | tr '[:upper:]' '[:lower:]' | grep "uuid=$uuid_alnum_lowercase" ; then LogPrintError "RAID device $name ($kname) recreated with UUID $uuid that is not in $LAYOUT_FILE" fi else # When there is a recreated RAID device without UUID # we grep for 'raidarray' entries in disklayout.conf that contain its NAME or KNAME # and check if such 'raidarray' entries have a 'uuid=...' option set and # if yes we assume the recreated RAID device was falsely recreated without UUID: # 'raidarray' entries can contain RAID devices like # raidarray /dev/md127 ... devices=/dev/sda,/dev/sdb ... uuid=... # raidarray /dev/md127 ... uuid=... devices=/dev/sda,/dev/sdb # so we use end of word delimiter '\>' that matches space comma and end of line. # The first grep may find more than one line and the second grep may find more that one UUID. # Check RAID devices named NAME: if grep "^raidarray .*$name\>" $LAYOUT_FILE | grep 'uuid=' ; then LogPrintError "RAID device $name ($kname) recreated without UUID but there is a UUID for $name in $LAYOUT_FILE" fi # Check RAID devices named KNAME if different than NAME: if test "$kname" != "$name" ; then if grep "^raidarray .*$kname\>" $LAYOUT_FILE | grep 'uuid=' ; then LogPrintError "RAID device $kname ($name) recreated without UUID but there is a UUID for $kname in $LAYOUT_FILE" fi fi fi # Additional checks could be added here if needed: done
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