Hi there! You might have seen failed or stuck or pending darwin builds. Our CI builders we got generously donated have ~250GB of disk space (which should be absolutely adequat for what we do), and macOS BigSur does some odd reservation of 200GB in /System/Volumes/Data, this is despite automatic updates being disabled and time machine being disabled.
It used to happen only when the system was expecting an update to be performed and the 200GB were freed after the update was done. After the latest update to 11.4, however, it seems to have not freed that space. This leaves the CI machine with ~50GB for for the system + build tools + gitlab checkouts and builds, and they frequently run out of space :-/ If someone knows how to prevent the system from doing stupid stuff like this (my hunch is it's keeping a backup of the system pre-udpate, for disaster recovery). Please come forward, my google searches haven't revealed anything useful yet. I have filed a TSI with Apple (still had a few on my developer account), but I don't expect them to come back to me before the end of June. Next week is WWDC, and there will be a massive backlog of issues that queued up leading up to, and during the WWDC. I've also only had very marginal success with them resolving issues that were not "you wrote this program wrong". If everything fails, maybe the solution is to attach some usbc ssd's to the macs and have gitlab builds be run dedicatedly on those disks. I'm a bit concerned about performance but we would have to see. Any ideas are welcome, please also feel free to hit me up on libera.chat#ghc, or the haskell foundations slack. Cheers, Moritz
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