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runc exec: implement --cgroup

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In some setups, multiple cgroups are used inside a container,
and sometime there is a need to execute a process in a particular
sub-cgroup (in case of cgroup v1, for a particular controller).
This is what this commit implements.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This commit is contained in:
Kir Kolyshkin
2021-06-29 18:42:50 -07:00
parent cc15b887a0
commit 0202c398ff
7 changed files with 195 additions and 3 deletions
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man/runc-exec.8.md
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@@ -59,6 +59,17 @@ multiple times.
: Pass _N_ additional file descriptors to the container (**stdio** +
**$LISTEN_FDS** + _N_ in total). Default is **0**.
**--cgroup** _path_ | _controller_[,_controller_...]:_path_
: Execute a process in a sub-cgroup. If the specified cgroup does not exist, an
error is returned. Default is empty path, which means to use container's top
level cgroup.
: For cgroup v1 only, a particular _controller_ (or multiple comma-separated
controllers) can be specified, and the option can be used multiple times to set
different paths for different controllers.
: Note for cgroup v2, in case the process can't join the top level cgroup,
**runc exec** fallback is to try joining the cgroup of container's init.
This fallback can be disabled by using **--cgroup /**.
# EXIT STATUS
Exits with a status of _command_ (unless **-d** is used), or **255** if