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autodetect does not work for overlay fs, set autodetect to failed

Kristian Klausen requested to merge github/fork/brandsimon/sbr/overlayfs_autodetect into master

Created by: brandsimon

It is possible to get the upper/lower directories for overlay fs:

findmnt -n '/' | sed -e 's/ /\n/g' -e 's/,/\n/g' | sed -e '/^\(lower\|upper\)dir=/!d'

Since the root was switched to the overlay mount point, these mountpoints usually don't exist. I don't know a solution to detect the filesystemtypes of these "old" mountpoints, so fallback to autodetect failed. If there is a better solution, I am happy to adapt the PR.

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