nixpkgs-unstable release channel 2-4 days out-of-sync from hydra

[jonringer]

According to hydra, "trunk" has been building regularly: https://hydra.nixos.org/job/nixpkgs/trunk/unstable#tabs-constituents

However, according to https://howoldis.herokuapp.com/ it's 2 days old.

And this is verified by going to https://nixos.org/channels/nixpkgs-unstable which redirects to https://releases.nixos.org/nixpkgs/nixpkgs-20.09pre214374.1fe82110feb at the time of writing.

But if we go to the read-only channel repo: https://github.com/NixOS/nixpkgs-channels/tree/nixpkgs-unstable it says it's 4 days old

[jonringer]

While researching for this issue, I noticed that trunk on hydra was held up by chromium.aarch64 https://hydra.nixos.org/eval/1572374 , specifically https://hydra.nixos.org/build/113412855

I think it might be worth while to have a discussion about packages which take obscene amounts of time to compile (most likely to be aarch64 jobs). The https://hydra.nixos.org/build/113412855 job is currently referenced in 15 evaluations, which means that it's been roughly 60 hours since it was first evaluated.

[jonringer]

cc @grahamc @FRidh @worldofpeace

[thefloweringash]

Related #78347

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[jonringer]

closing, issue seems to be related to either aarch or darwin taking a long time to munch through a package set