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.github.ci: evaluate the machines with iets eval-jobs
iets (numtide/iets, a Nix evaluator in Rust) gives the same drvPath,
isCached and cacheStatus for every machine as nix-eval-jobs 2.35.4, in
24-35s instead of 108-144s (4 workers, coaxmetal). It is a flake input
so CI builds it once and pushes it to cache.lassul.us with niks3 and
the lazy store.
author
Hermes
committer
lassulus
date
(Oct 17, 2026, 3:01 PM CEST)
commit
e2b33544
e2b335447e1fa8f77091834c135ad68f7c6ac8f9
parent
8d5bb21c
8d5bb21c422f2381e2c5fe9a0f9c64339410c5b5
+52
-8
+38
-1
flake.lock
+38
-1
flake.lock
···
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},
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"crane": {
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"locked": {
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"lastModified": 1790899423,
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"narHash": "sha256-THGtz65UGJU+sonZidRboyCMk+9DclpMF7pwL4uDV4M=",
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"owner": "ipetkov",
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"repo": "crane",
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"rev": "47b6b27ed9a3a9181415e4367d0c30ab2a0e0250",
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"type": "github"
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},
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"original": {
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"owner": "ipetkov",
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"repo": "crane",
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"type": "github"
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}
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},
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"crane_2": {
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"locked": {
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"lastModified": 1788465171,
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"narHash": "sha256-Y1/TTVXjYXGF068IThQH9fPSZ0SIE74PABlUxnWTUH0=",
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"owner": "ipetkov",
···
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"original": {
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"owner": "nix-community",
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"repo": "home-manager",
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"type": "github"
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}
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},
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"iets": {
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"inputs": {
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"crane": "crane",
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"nixpkgs": [
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"nixpkgs"
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]
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},
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"locked": {
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"lastModified": 1792229581,
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"narHash": "sha256-HED+KoK3cWACc3g3JHwSJ2X2w8bmAYC+33ceYwjHygc=",
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"owner": "numtide",
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"repo": "iets",
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"rev": "92f514a30e8c400077450b8966f0b9d7b176b143",
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"type": "github"
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},
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"original": {
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"owner": "numtide",
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"repo": "iets",
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"type": "github"
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}
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},
···
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"clan-core": "clan-core",
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"disko": "disko",
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"hermes-agent": "hermes-agent",
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"iets": "iets",
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"kartei": "kartei",
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"llm-agents": "llm-agents",
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"niks3": "niks3",
···
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},
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"tincr": {
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"inputs": {
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"crane": "crane",
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"crane": "crane_2",
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"fenix": "fenix",
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"nixpkgs": [
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"nixpkgs"
+7
flake.nix
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flake.nix
···
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byoidc.inputs.nixpkgs.follows = "nixpkgs";
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byoidc.inputs.treefmt-nix.follows = "treefmt-nix";
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# Nix evaluator in Rust, CI evaluates the machines with its eval-jobs
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# (.github/workflows/ci.yml). No import from derivation there.
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iets.url = "github:numtide/iets";
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iets.inputs.nixpkgs.follows = "nixpkgs";
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};
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outputs =
···
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packages.clan-cli = clan-core.packages.${system}.clan-cli;
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# CI pushes its builds to cache.lassul.us with it (.github/niks3-push.sh)
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packages.niks3 = inputs.niks3.packages.${system}.niks3;
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# CI's eval job evaluates ciToplevels with it
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packages.iets = inputs.iets.packages.${system}.default;
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devShells.default = pkgs.mkShell {
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packages = [
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self.packages.${pkgs.system}.pass
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-7
.github/workflows/ci.yml
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-7
.github/workflows/ci.yml
···
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# The NixOS machines, built on plain runners with hestia (the GitHub Actions
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# cache) as binary cache next to cache.lassul.us:
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#
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# - eval: evaluates ciToplevels once, uploads the drv closures to hestia,
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# - eval: evaluates ciToplevels once (iets), uploads the drv closures to hestia,
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# lists the machines whose toplevel is in neither cache and the
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# derivations needed by more than one of them (.github/ci-shared.sh).
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# - shared: builds those once, so the machine jobs substitute them instead
···
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upstream-cache-key-names: cache.nixos.org-1 cache.lassul.us-1
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filter-drv-closures: true
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# the niks3 client of all jobs and the lazy store of the machine jobs,
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# the others substitute them; nix-eval-jobs from the flake's nixpkgs,
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# which the flake evaluation fetches anyway
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# the others substitute them; iets for the evaluation, its eval-jobs
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# is nix-eval-jobs about 5 times faster (no import from derivation)
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- id: tools
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run: |
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niks3=$(nix build --no-link --print-out-paths .#niks3)
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lazy=$(nix build --no-link --print-out-paths .#lazy-store)
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nej=$(nix build --no-link --print-out-paths --inputs-from . nixpkgs#nix-eval-jobs)
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iets=$(nix build --no-link --print-out-paths .#iets)
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{
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echo "niks3=$niks3"
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echo "lazy-store=$lazy"
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echo "nix-eval-jobs=$nej/bin/nix-eval-jobs"
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echo "iets=$iets/bin/iets"
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} >> "$GITHUB_OUTPUT"
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PATH=$niks3/bin:$PATH .github/niks3-push.sh "$niks3" "$lazy"
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PATH=$niks3/bin:$PATH .github/niks3-push.sh "$niks3" "$lazy" "$iets"
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- id: matrix
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uses: Mic92/hestia/matrix@v3
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with:
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flake: ".#ciToplevels"
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nix-eval-jobs: "${{ steps.tools.outputs.nix-eval-jobs }} --workers 4 --max-memory-size 3072"
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nix-eval-jobs: "${{ steps.tools.outputs.iets }} eval-jobs --workers 4 --max-memory-size 3072"
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- env:
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MATRIX: ${{ steps.matrix.outputs.matrix }}
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run: |