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systemd: Add support for managing cgroups through systemd
`SystemdCgroup` takes a `parent`, which is the name of a slice, and a `unit`, which is the name of a slice or a scope unit, and provides methods to start, kill the unit, as well as set properties for the unit. The mods, `cpu`, `memory`, `cpuset`, and `pids`, are designed to generate properties quickly. It hides the difference between cgroups v1 and v2, and does simple checks for the systemd version and arguments. Signed-off-by: Xuewei Niu <niuxuewei.nxw@antgroup.com>
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# Systemd Dbus
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How to generate `xxx_proxy.rs` files
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```shell
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# install zbus-xmlgen if not
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$ cargo install zbus-xmlgen
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# generate interface in XML format
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$ busctl introspect --xml-interface \
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org.freedesktop.systemd1 \
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/org/freedesktop/systemd1 \
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org.freedesktop.systemd1.Manager > /tmp/systemd1-manager.xml
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# generate Rust code from XML
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$ zbus-xmlgen file /tmp/systemd1-manager.xml \
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--output src/systemd/dbus/systemd_manager_proxy.rs
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$ rm -rf /tmp/systemd1-manager.xml
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```
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