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Let's tweak when precisely to apply cgroup attributes on the root
cgroup.
With this we now follow the following rules:
1. On cgroupsv2 we never apply any regular cgroups to the host root,
since the attributes generally do not exist there.
2. On cgroupsv1 we do not apply any "weight" or "shares" style
attributes to the host root cgroup, since they don't make much sense
on the top level where there's only one group, hence no need to
compare weights against each other. The other attributes are applied
to the host root cgroup however.
3. In any case we don't apply attributes to the root of container
environments (and --user roots), under the assumption that this is
managed by the manager further up. (Note that on cgroupsv2 this is
even enforced by the kernel)
4. BPF pseudo-attributes are applied in all cases (since we can have as
many of them as we want)
Let's emphasize that this function checks for the host root cgroup, i.e.
returns false for the root cgroup when we run in a container where
CLONE_NEWCGROUP is used. There has been some confusion around this
already, for example cgroup_context_apply() uses the function
incorrectly (which we'll fix in a later commit).
Just some refactoring, not change in behaviour.
If we run in a container we shouldn't patch around this, and most likely
we can't anyway, and there's not much point in complaining about this.
Hence let's strictly say: the agent is private property of the host's
system instance, nothing else.
The way this is used drifted a bit from the original intent. Let's update
the description and add some examples to inspire people to texts that look
less bad during initial boot.
