The current documentation of overlayfs states the following:
Multiple lower layers
---------------------
Multiple lower layers can now be given using the the colon (":") as a
separator character between the directory names. For example:
mount -t overlay overlay -olowerdir=/lower1:/lower2:/lower3 /merged
As the example shows, "upperdir=" and "workdir=" may be omitted. In that
case
the overlay will be read-only.
Consider the case /lower1/A and /lower2/A exist.
What is part of the api - that it is undefined or that one takes presedence
over the other?
It would be nice to have this clarified in the documentation.
Thanks,
Fabian
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