I am now waiting already a couple of hours to successfully switch and upgrade my nixos.
I did the following:
nix flake update
nixos-rebuild switch --upgrade
I needed to restart the procedure a couple of time as my system froze due to oom and crashed during the build.
The main issue seems to be that
webkitgtk-2.42.4 is not available in cache.nixos.org as the hydra jobs are still pending. Therefore nix needs build the package on my own machine.
Is there some way to ensure that
nix flake update only updates to a revision which was fully built by hydra and therefore it was safe to assume that the upgrade in worst case takes only a few minutes in instead of hours and crashing my system?