Fails to read nixos-rebuild output correct

[TheArcaneBrony]

Output is spammed with @nix {"action":"start"... and seems to miss a lot of steps.

[TheArcaneBrony]

Update: seems to be related to unbuffer

[maralorn]

Can you please share the command you ran?

[TheArcaneBrony]

unbuffer nixos-rebuild switch --flake .#Rory-nginx -j`nproc` --upgrade-all --log-format internal-json -v |& nom --json

[maralorn]

I am surprised that this is working at all. But I agree it’s weird that it works for some lines and doesn‘t for others.

[TheArcaneBrony]

if this is marked as an enhancement, i wonder if we could get a nom os-rebuild subcommand or similar?

[maralorn]

The wish for a nom supported nixos-rebuild has been voiced before. And is definitely an open feature request. But I think it is more about changing nixos-rebuild than solving this in nom.

The enhancement request that I see in this issue would be "make the --json parser cleanly pass-through non json lines and correctly detect all json lines." I consider this an enhancement and not a bug because the --json parser was never supposed to be used on non-json input.

[TheArcaneBrony]

what i personally ended up doing was using nom build to build the system closure and then using nixos-rebuild afterwards to deploy it

nom build .#nixosConfigurations.${2}.config.system.build.toplevel && sudo nixos-rebuild switch --flake .#${HOSTNAME} || exit 1

[mibmo]

does anyone know if there are any downsides to @TheArcaneBrony's approach? seems pretty good to me, all things considered :)

[maralorn]

No, that’s basically what I do.

[becknik]

You might find the nh cli helper particularly useful when it comes to using nom in conjunction with nixos-rebuild.