`sig
val exists : OpamTypes.repository -> bool
val init : OpamTypes.repository -> unit OpamProcess.job
val fetch : OpamTypes.repository -> unit OpamProcess.job
val reset : OpamTypes.repository -> unit OpamProcess.job
val diff : OpamTypes.repository -> bool OpamProcess.job
val revision : OpamTypes.repository -> string OpamProcess.job
val versionned_files : OpamTypes.repository -> string list OpamProcess.job
end`