Topkg_care.Opamopam helpers.
cmd is a command for opam looked up using Tool lookup "opam" `Host_os.
ensure_publish () makes sure opam-publish is in the executable search PATH.
submit ~opam_file submits the opam file opam_file with opam-publish and submission message msg (if any) to the OCaml opam repository.
ocaml_base_packages are the base opam packages distributed with OCaml: "base-bigarray", "base-bytes", "base-threads", "base-unix".
module File : sig ... endopam files
module Descr : sig ... enddescr files.
module Url : sig ... endurl files.