[Bug 531240] Re: silently breaking raid: root raid_members opened as luks

[ceg]

I would not thing blkid (util-linux) has altered the metadata on disk.

As it got altered blkid may actually never have (occasionally)
misreported anything to cause the behaviour. (The util-linux bug may not
have exsted in karmic nor lucid.) I have seen blkid reporting raid
correctly after installation and rebuilding the array, then things got
repeatedly messed up and it reported luks (correctly as we have to
assume now).

Can we be sure that blkid ever had a time when it would actually
(occasionally) misreport "luks on raid" as luks in karmic?

If not this mostly puts all possibilities that can cause this to
cryptsetup.

The question would then not only be whether "cryptsetup isLuks" could
correctly check for luks devices to prevent any misopening. (Possibly by
simply checking with blkid prior of probing the luks metadata.) But
cryptsetup's initramfs scripts may itself select/detect/open a wrong
device on occasions (mkinitramfs/boot).

-- 
silently breaking raid: root raid_members opened as luks
https://bugs.launchpad.net/bugs/531240
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