Cannot mount devtmpfs with runC

[wking]

RunC currently hard-codes a list of supported mount types, which means I can't do things like mount a devtmpfs at /dev (I just end up in the default case and error out). I've tried patching:

-       case "tmpfs":
+       case "tmpfs", "devtmpfs":

but still get errors like:

FATA[0000] Container start failed: [8] System error: operation not permitted

I'd like to be able to mount devtmpfs so we don't have to figure out opencontainers/runtime-spec#95 internally (we can let the Linux-kernel folks figure that out).

More generally, I'd expect we can adjust runC to support arbitrary mount(2)-style mounting without needing to hard-code a list of supported mount types. For example, we could have special handling for cgroups and other things, and then fall back to a generic mount(2)-style call in the default case.

[wking]

Maybe fixed in v0.9.0 (“Allow all mount types inside the container's mount namespace”)?

[hqhq]

I think so, closing.