CompareFCV compares two strings as dot-delimited tuples of integers.

GetBareSession returns an mgo.Session from the environment or from a default host and port.

GetBareSessionProvider returns a session provider from the environment or from a default host and port.

GetFCV returns the featureCompatibilityVersion string for an mgo Session or the empty string if it can't be found.

MergeOplogStreams combines oplog arrays such that the order of entries is random, but order-preserving with respect to each initial stream.