Vcs.Log
A log is a complete listing of the structure of the dag.
It contains all the commits, along with the parents of each commit.
module Line : sig ... end
type t = Line.t list
val sexp_of_t : t -> Sexplib0.Sexp.t
val equal : t -> t -> bool
val roots : t -> Rev.t list
Return the list of all init commits.