pub fn read_mirror(dir: &Path) -> Result<Mirror>Expand description
Read the local mirror under dir: the rules plus the exception lists they
reference.
A rule file holds a rule followed by any rule_default containers that
belong to it. Those containers are inlined in the rule file but are still
part of the mirror: rule_default is an ordinary container, so it must
round-trip through diff and push like any other referenced list.