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fix: select rust sources via filesets so new dirs keep the cargo cache

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This commit is contained in:
müde 2026-07-13 21:16:29 +02:00
commit c0bd77b314
1 changed files with 18 additions and 15 deletions
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33
nix/rust.nix
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@ -3,6 +3,9 @@
# inputs every rust derivation (packages + checks) consumes.
# Imported per system from flake.nix.
{ pkgs, craneLib }:
let
inherit (pkgs) lib;
in
rec {
# Shared between buildDepsOnly + buildPackage + cargoClippy/cargoTest
# so every derivation in the chain sees the same toolchain shape.
@ -21,21 +24,21 @@ rec {
pkgs.cmake
];
# Narrowed source tree the rust derivations consume.
# `cleanCargoSource` is crane's standard "everything cargo cares
# about" filter (Cargo.toml/Cargo.lock + *.rs). All non-rust runtime
# assets — branding + the claude system prompt template +
# claude-settings.json — live in the separate `hyperhive-assets`
# derivation and are loaded by the binaries at runtime from
# `$HIVE_ASSETS_DIR`. The unit tests in `hive-ag3nt::prompt` read
# `prompts/system.md` directly from the workspace tree at *test*
# runtime (via `env!("CARGO_MANIFEST_DIR")` — a compile-time string,
# no file open at compile), so the prompt template doesn't have to
# be in this fileset to keep `cargo test` honest. Net effect: tweaks
# to any non-`*.rs` / non-`Cargo.*` file (README, branding, nix
# modules, frontend tree, OR `hive-ag3nt/prompts/*`) do NOT bust
# this src hash, so the rust derivations stay fully cached.
cleanSrc = craneLib.cleanCargoSource ../.;
# Narrowed source tree the rust derivations consume: everything
# cargo cares about (Cargo.toml/Cargo.lock + *.rs/*.toml), selected
# via `lib.fileset` rather than crane's `cleanCargoSource` filter —
# filesets drop directories that contain no selected files, so
# adding or renaming a non-rust directory (nix modules, docs, …)
# does NOT bust this src hash (an empty dir under a plain source
# filter would). All non-rust runtime assets — branding + the claude
# prompt template + claude-settings.json — live in the separate
# `hyperhive-assets` derivation and are loaded by the binaries at
# runtime from `$HIVE_ASSETS_DIR`. Net effect: only `*.rs` /
# `*.toml` / `Cargo.lock` edits rebuild the rust derivations.
cleanSrc = lib.fileset.toSource {
root = ../.;
fileset = craneLib.fileset.commonCargoSources ../.;
};
# Build the workspace's dependency tree once, cached as its own
# derivation. Package builds and checks reuse this via