Searches and returns a repository of locked packages.

def locked_repository(
        self, with_dev_reqs=False
    ):  # type: (bool) -> poetry.repositories.Repository
        """
        Searches and returns a repository of locked packages.
        """
        if not self.is_locked():
            return poetry.repositories.Repository()

        lock_data = self.lock_data
        packages = poetry.repositories.Repository()

        if with_dev_reqs:
            locked_packages = lock_data["package"]
        else:
            locked_packages = [
                p for p in lock_data["package"] if p["category"] == "main"
            ]

        if not locked_packages:
            return packages

        for info in locked_packages:
            package = poetry.packages.Package(
                info["name"], info["version"], info["version"]
            )
            package.description = info.get("description", "")
            package.category = info["category"]
            package.optional = info["optional"]
            package.hashes = lock_data["metadata"]["hashes"][info["name"]]
            package.python_versions = info["python-versions"]

            if "marker" in info:
                package.marker = parse_marker(info["marker"])
            else:
                # Compatibility for old locks
                if "requirements" in info:
                    dep = poetry.packages.Dependency("foo", "0.0.0")
                    for name, value in info["requirements"].items():
                        if name == "python":
                            dep.python_versions = value
                        elif name == "platform":
                            dep.platform = value

                    split_dep = dep.to_pep_508(False).split(";")
                    if len(split_dep) > 1:
                        package.marker = parse_marker(split_dep[1].strip())

            for dep_name, constraint in info.get("dependencies", {}).items():
                if isinstance(constraint, list):
                    for c in constraint:
                        package.add_dependency(dep_name, c)

                    continue

                package.add_dependency(dep_name, constraint)

            if "source" in info:
                package.source_type = info["source"]["type"]
                package.source_url = info["source"]["url"]
                package.source_reference = info["source"]["reference"]

            packages.add_package(package)

        return packages