UUPS: Warning: A proxy admin was previously deployed on this network.

After a clean install, deploying only UUPS proxy contracts, the following warning is thrown during each contract deployment for a local hardhat network.

Warning: A proxy admin was previously deployed on this network.

My guess is that the plugin still deploys a proxy admin for UUPS proxies, or that somehow some data from my previous Transparent proxy deployments is still in my computer somewhere, triggering the alert – but as I said, I did try with a clean dependency install.

[aspiers]

“UUPS deployment does not use an admin” caused me some confusion at first - I think I understand what you mean now, but I’d like to double check if that’s OK?

Let me start by explaining the origin of my confusion as I understand it. My thinking was as follows:

Any upgradeable proxy, including a UUPS proxy, needs at least one account which can upgrade it (let’s ignore the crazy corner case where upgrade is a permissionless action which anyone can do). So thinking intuitively without focusing on any details of how UUPS works, that account is the notional “admin” of the proxy. Therefore according to that somewhat non-technical perspective of (say) a developer building these upgradeable proxies, or of an admin who wants to be able to upgrade them, it’s somewhat confusing to read a statement saying that a UUPS deployment does not use an admin.

However, I think your point was that it is not the UUPS code itself which determines the admin, but the code of the underlying implementation - right? And this is one of the main distinguishing features of UUPS vs. transparent: that UUPS delegates not only normal method calls, but also the management of the upgrade process itself.

In that respect, for UUPS proxies it is not OZ which is managing the admin role, whereas for transparent proxies it is. Did I get that right?

So in the context of this issue report, it would be great if the error message these nuances somehow more clear.

Thanks a lot!

[frangio]

Thank you for reporting @rellfy.

Did you delete the .openzeppelin/unknown-31337.json file? This is the network file for Hardhat Network.