def preflight()

in src/buildstream_plugins/sources/pip.py [0:0]

• 13 lines of code
• 5 McCabe index (conditional complexity)

    def preflight(self):
        # Try to find a pip version that spports download command
        self.host_pip = None
        for python in reversed(_PYTHON_VERSIONS):
            try:
                host_python = utils.get_host_tool(python)
                rc = self.call([host_python, "-m", "pip", "download", "--help"])
                if rc == 0:
                    self.host_pip = [host_python, "-m", "pip"]
                    break
            except utils.ProgramNotFoundError:
                pass

        if self.host_pip is None:
            raise SourceError("{}: Unable to find a suitable pip command".format(self))