hbck1 has the facility for restoring the hbase.version file under /hbase if it goes missing. This issue is about building a dedicated tool to do this in hbase-operator-tools or making use of hbck1 as is to do it and document how in refguide.
For description, see http://hbase.apache.org/book.html#_special_cases_hbase_version_file_is_missing
As is, we have a regression in our fixup tooling.
Perhaps we create general fs fixup tool? It would do the above and then some.