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dashboard: fix prettier-svelte rebuilding on every file change

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The prettier-svelte package was rebuilding whenever any file in the
repository changed because dashboardStubSrc referenced inputs.self
directly. Since inputs.self's store path hash is computed from the
entire repository contents, any file modification invalidated the
derivation.

Added dashboardLockfileSrc using lib.cleanSourceWith to filter
inputs.self to only include package.json and package-lock.json from
the dashboard directory. Updated dashboardStubSrc to reference this
filtered source instead of inputs.self directly.

This ensures prettier-svelte only rebuilds when the lockfiles actually
change, significantly improving build caching for unrelated changes.

Test plan:
- Built prettier-svelte with nix build .#prettier-svelte
- Modified src/exo/main.py and rebuilt - same store path (no rebuild)
- Modified dashboard/package.json and rebuilt - different store path (rebuild triggered)
- Ran nix flake check successfully
This commit is contained in:
Jake Hillion
2026-01-26 11:21:43 +00:00
parent d93db3d6bf
commit 1290e8ed9f
1 changed files with 18 additions and 2 deletions
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dashboard/parts.nix
+18 -2
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@@ -3,12 +3,28 @@
perSystem =
{ pkgs, lib, ... }:
let
# Filter source to ONLY include package.json and package-lock.json
# This ensures prettier-svelte only rebuilds when lockfiles change
dashboardLockfileSrc = lib.cleanSourceWith {
src = inputs.self;
filter =
path: type:
let
baseName = builtins.baseNameOf path;
isDashboardDir = baseName == "dashboard" && type == "directory";
isPackageFile =
(lib.hasInfix "/dashboard/" path || lib.hasSuffix "/dashboard" (builtins.dirOf path))
&& (baseName == "package.json" || baseName == "package-lock.json");
in
isDashboardDir || isPackageFile;
};
# Stub source with lockfiles and minimal files for build to succeed
# This allows prettier-svelte to avoid rebuilding when dashboard source changes
dashboardStubSrc = pkgs.runCommand "dashboard-stub-src" { } ''
mkdir -p $out
cp ${inputs.self}/dashboard/package.json $out/
cp ${inputs.self}/dashboard/package-lock.json $out/
cp ${dashboardLockfileSrc}/dashboard/package.json $out/
cp ${dashboardLockfileSrc}/dashboard/package-lock.json $out/
# Minimal files so vite build succeeds (produces empty output)
echo '<!DOCTYPE html><html><head></head><body></body></html>' > $out/index.html
mkdir -p $out/src