def initialize_opam_switch()

in scripts/setup.py [0:0]

• 37 lines of code
• 1 McCabe index (conditional complexity)

    def initialize_opam_switch(self) -> Mapping[str, str]:
        self.check_if_preinstalled()

        self.validate_opam_version()
        self.run(
            [
                "opam",
                "init",
                "--bare",
                "--yes",
                "--root",
                self.opam_root.as_posix(),
                "default",
                "https://opam.ocaml.org",
            ]
        )
        self.run(
            [
                "opam",
                "switch",
                "create",
                self.compiler,
                "--packages=ocaml-option-flambda",
                "--yes",
                "--root",
                self.opam_root.as_posix(),
            ]
        )
        opam_environment_variables = self.opam_environment_variables()

        # This is required to work around a bug in pre-OCaml 4.12 that prevents
        # `re2` from installing correctly.
        # See https://github.com/janestreet/re2/issues/31
        ocamlc_location = self.run(
            ["ocamlc", "-where"], add_environment_variables=opam_environment_variables
        )
        self.run(["rm", "-f", f"{ocamlc_location}/version"])

        self.run(
            ["opam", "install", "--yes"] + DEPENDENCIES,
            add_environment_variables=opam_environment_variables,
        )

        return opam_environment_variables