def _list_tar_paths()

in src/buildstream/plugins/sources/tar.py [0:0]

• 19 lines of code
• 14 McCabe index (conditional complexity)

    def _list_tar_paths(self, tar):

        visited = set()
        for member in tar.getmembers():

            # Remove any possible leading './', offer more consistent behavior
            # across tarballs encoded with or without a leading '.'
            member_name = member.name.lstrip("./")

            if not member.isdir():

                # Loop over the components of a path, for a path of a/b/c/d
                # we will first visit 'a', then 'a/b' and then 'a/b/c', excluding
                # the final component
                components = member_name.split("/")
                for i in range(len(components) - 1):
                    dir_component = "/".join([components[j] for j in range(i + 1)])
                    if dir_component not in visited:
                        visited.add(dir_component)
                        try:
                            # Dont yield directory members which actually do
                            # exist in the archive
                            _ = tar.getmember(dir_component)
                        except KeyError:
                            if dir_component != ".":
                                yield dir_component

                continue

            # Avoid considering the '.' directory, if any is included in the archive
            # this is to avoid the default 'base-dir: *' value behaving differently
            # depending on whether the tarball was encoded with a leading '.' or not
            if member_name == ".":
                continue

            yield member_name