Hi, https://review.openstack.org/#/c/523387 proposes adding a z/VM specific dependancy to nova's requirements.txt. When I objected the counter argument is that we have examples of windows specific dependancies (os-win) and powervm specific dependancies in that file already.
I think perhaps all three are a mistake and should be removed. My recollection is that for drivers like ironic which may not be deployed by everyone, we have the dependancy documented, and then loaded at runtime by the driver itself instead of adding it to requirements.txt. This is to stop pip for auto-installing the dependancy for anyone who wants to run nova. I had assumed this was at the request of the deployer community. So what do we do with z/VM? Do we clean this up? Or do we now allow dependancies that are only useful to a very small number of deployments into requirements.txt? Michael
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