Try to get Btrfs volume UUID using libblockdev if UDev lookup fails #936
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Resolves: rhbz#1860602
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Resolves: rhbz#1860602
This isn't really a fix, just a workaround. @dwlehman mentioned similar issue happening in the store role too, we should consider reading the UUID and similar properties we gather in
_post_createfrom other sources than UDev. We runudev.settle()but it doesn't help.