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Kir Kolyshkin
1cbfe23464
This was initially added by commits41d9d26513and4a8f0b4db4, apparently to implement docker run --cgroup container:ID, which was never merged. Therefore, this code is not and was never used. It needs to be removed mainly because having it makes it much harder to understand how cgroup manager works (because with this in place we have not one or two but three sets of cgroup paths to think about). Note if the paths are known and there is a need to add a PID to existing cgroup, cgroup manager is not needed at all -- something like cgroups.WriteCgroupProc or cgroups.EnterPid is sufficient (and the latter is what runc exec uses in (*setnsProcess).start). Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>