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Rebuild: Separate evaluation

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This commit is contained in:
Geoffrey Frogeye 2025-01-23 18:17:01 +01:00
parent fafc4d45b7
commit cd4536c53b
Signed by: geoffrey
GPG key ID: C72403E7F82E6AD8
2 changed files with 9 additions and 5 deletions

1
flake.nix
View file

@ -153,6 +153,7 @@
runtimeInputs = with pkgs; [ runtimeInputs = with pkgs; [
nix-output-monitor nix-output-monitor
nixos-rebuild nixos-rebuild
jq
]; ];
text = builtins.readFile ./os/rebuild.sh; text = builtins.readFile ./os/rebuild.sh;
} }

13
os/rebuild.sh
View file

@ -24,12 +24,15 @@ then
exit 2 exit 2
fi fi
info "Building" info "Evaluating"
tmpdir="$(mktemp -d)" # Evaluating can take a lot of memory, and Nix doesn't free it until the program ends,
# which can be limiting on memory-constrained devices. Hence the build step is separate.
# nix eval doesn't use the eval cache, so we do a nix build --dry-run
# sudo so the eval cache is shared with nixos-rebuild # sudo so the eval cache is shared with nixos-rebuild
sudo nom build "$self#nixosConfigurations.$HOSTNAME.config.system.build.toplevel" -o "$tmpdir/toplevel" "$@" toplevel=$(time sudo nix build "$self#nixosConfigurations.$HOSTNAME.config.system.build.toplevel" --dry-run --json | jq '.[0].outputs.out' -r)
toplevel="$(readlink -f "$tmpdir/toplevel")"
rm -rf "$tmpdir" info "Building"
sudo nom build "$toplevel" --no-link "$@"
info "Showing diff" info "Showing diff"
nvd diff "$(readlink -f /nix/var/nix/profiles/system)" "$toplevel" nvd diff "$(readlink -f /nix/var/nix/profiles/system)" "$toplevel"