r23952: Streamline and improve the logic of tdb_validate_and backup:
- call tdb_validate on the given tdb.
- if validation is successful, create a backup
return 0 (success) even if the backup fails.
- if validation fails:
- move tdb to name.corrupt (don't exit if this fails)
- look for a valid backup
- if a valid backup is found, restore it, else return -1 (failure)
if restoring succeeds, return 0 (success), else -1 (failure)
Summing up:
If 0 is returned, there is a valid tdb at the given location:
either the original one ore one restrored from a backup.
If -1 is returned, there is no valid tdb at the given location:
Either there is no file at all, or the original file is still
in place (if moving it away failed).
Michael
(This used to be commit
1c36ccd86d85b02f27ec66d37bdf7f04ad760901)