Mount socket path in duffle.json

[maingoh]

I would like to use duffle with docker compose (I cannot use docker app because of its restriction to docker compose 3 format). Thus I need to mount the docker socket like here https://github.com/docker/app/blob/dc6d86d1163f63ade2a2d6a585e9559fec4b3f1c/internal/cnab/driver.go#L99
However I would like to avoid creating a custom driver. Is it possible to mount it in the invocationImages field of the duffle.json ? I cannot find documentation about the dockerConfigurationOptions here https://github.com/cnabio/cnab-go/blob/03423407b46b8c61ba8c82588c6cd9a61fc213ed/driver/docker/docker.go#L31

[maingoh]

Alternatively can I build a custom driver by reusing the docker driver and mounting volume during install ?

[vdice]

Coincidentally, this functionality is currently in PR form in Porter (another CNAB runtime) to do similar. Note the implementation in https://github.com/deislabs/porter/pull/951/files#diff-7816965629edfe825f9dc9a1737826c5R58-R78 . This should guide you on how to add support in Duffle.

The Porter maintainers are still discussing what the desired state will be regarding how to enable this functionality. I don't recall having the same discussion here in the Duffle reference implementation repo.

@radu-matei has mentioned going the custom driver route (if I recall correctly). We could also feasibly go the required custom extensions route as well (acting as a toggle to turn on the added functionality in Duffle).

Perhaps while this discussion proceeds, you have enough to go on to add support in a branch for testing and seeing how it works for your needs?