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Derek McGowan
a72247425b
A shim that performs some mount types or transformations itself, so that containerd's mount manager does not perform them on its behalf, had no way to say so other than a comma separated string in the generic annotations map of its RuntimeInfo. Add a containerd.types.MountCapabilities extension a shim can attach to its BootstrapResult, naming the mount types and transforms it handles. Detail lives in an extension rather than fields of BootstrapResult so that containerd can ignore an extension whose type it does not recognize, letting a shim advertise unconditionally. Presence of the extension is enough: it is not gated behind a Capability enum value, since with no other consumer of that field an enum value here would only ever duplicate what the extension's presence already says, while still permitting states with no single correct interpretation, such as the enum value being set with no extension attached, or the reverse. This is additive: only a new field is added to BootstrapResult, and buf breaking is clean. Signed-off-by: Derek McGowan <derek@mcg.dev>