[Request]: Support bind mounting the same directory multiple times in the container

[justinyaodu]

Feature or enhancement request details

If I mount one directory into a container, it works fine:

container run -it --rm --mount type=bind,src=$HOME,dst=/home-ro,ro debian:unstable bash

But if I try to mount the same directory twice, it fails:

container run -it --rm --mount type=bind,src=$HOME,dst=/home-rw --mount type=bind,src=$HOME,dst=/home-ro,ro debian:unstable bash
Error: unknown: "Error Domain=VZErrorDomain Code=2 "More than one Virtio File System device uses the tag “04131abe9006686b4bfe17357444d13e2622”." UserInfo={NSLocalizedFailure=Invalid virtual machine configuration., NSLocalizedFailureReason=More than one Virtio File System device uses the tag “04131abe9006686b4bfe17357444d13e2622”.}"

Admittedly, I don't have a compelling need for this, but the limitation feels a bit arbitrary and didn't see any mention of it elsewhere. I figured I could post an issue in case it's a simple fix. Thanks!

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[egernst]

I honestly can't think of a scenario where a user would want to do this. We can look into this, but it'll be a lower priority on our end.

At this point, you have CAP_SYS_ADMIN, so you should be able to work around by doing your own bind mount of original to a second path, as well.

[dcantah]

To be fair, this shouldn't be all too bad to fix over in the containerization library (where this error is originating from). Let me see over the next 30 minutes or so

[dcantah]

apple/containerization#243 this should fix it