044685cd18
We could perhaps have a method that does this given a dataset, but it's yet clear that we'll always want to bypass the altroot when we grab the mountpoint. For now, we'll refactor things a bit so we grab the altroot length when libbe is initialized and have a common method that does the necessary augmentation (replace with / if it's the root, return a pointer to later in the string if not). This will be used in some upcoming work to make be_mount work properly for deep BEs. MFC after: 1 week
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