Hi, All,

I found that in prune API, for partial success docker daemon directly returns 500, while I think we could improve this.

Here is an example:

A user has 10 unused images, and he sends an image prune API request. If docker daemon succeeds in removing 5 unused images, and fails to remove the others, what should docker daemon return for the client request?

Current Docker Daemon's response:

Docker Daemon directly responses with a 500 error, and ignore the 5 images which have already been removed. And the 5 removed images' space size cannot be passed to the client side.

I think the is a partial success case. For the successful part, the corresponding data is still important for user, thus I think we need to make docker daemon will transfer the data to client side? Then what kind of status code is reasonable? 200, 500, 207?

ping @stevvooe @mlaventure