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fix(ci): replace --no-build with disk cleanup for nix-validate #299

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JacobPEvans-personal merged 2 commits into from
May 11, 2026
Merged

fix(ci): replace --no-build with disk cleanup for nix-validate #299

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fix(ci): replace --no-build with disk cleanup for nix-validate
JacobPEvans-personal May 11, 2026
93dfb86
fix(ci): pin free-disk-space SHA and gate to ubuntu runners
JacobPEvans-personal May 11, 2026
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36 changes: 30 additions & 6 deletions .github/workflows/_nix-validate.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,29 @@ jobs:
- name: Checkout
uses: actions/checkout@v6

# Free ~30GB on the ubuntu-latest runner so `nix flake check --all-systems`
# has space to substitute darwin source paths (rustc-src, cctools,
# apple-sdk, etc.) without hitting "No space left on device". The default
# runner image has ~14GB free; nix-darwin / nix-ai darwin closures need
# noticeably more than that. Keeps tool-cache (Node/Python/Go) intact for
# downstream steps. Replaces an earlier --no-build attempt that broke
# consumer checks referencing derivation outputs across platforms.
#
# Gated to ubuntu-* runners only — never run on a self-hosted runner
# (RunsOn etc.), where removing preinstalled components would damage
# long-lived state.
- name: Free disk space
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if: startsWith(inputs.runner_label, 'ubuntu-')
uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be # v1.3.1
with:
tool-cache: false
android: true
dotnet: true
haskell: true
large-packages: false
swap-storage: false
docker-images: true

# determinate-nix-action@v3 is ONLY a Nix installer (replaced nix-installer-action@v21).
# It does NOT include flake checking — that was a separate action (flake-checker-action).
# Flake evaluation is handled by `nix flake check` below, not by the installer.
Expand Down Expand Up @@ -62,12 +85,13 @@ jobs:
nix-linux-${{ runner.os }}-

- name: Check flake
# --no-build: evaluate all systems' outputs without downloading/building
# derivations. Catches broken-package and evaluation errors cross-platform
# without exhausting disk on the linux runner (darwin packages like
# rustc-src, cctools, apple-sdk would otherwise be downloaded) or hitting
# "platform mismatch" build failures on aarch64-darwin-only derivations.
run: nix flake check --all-systems --no-build --print-build-logs --show-trace --keep-going
# --all-systems evaluates outputs for every declared system to catch
# darwin-only broken packages from the linux runner. Disk cleanup above
# ensures source-path substitution for darwin closures fits. --no-build
# is intentionally NOT used here: it disables substitution context for
# input flakes which breaks consumer checks that reference derivation
# outputs across platforms (e.g. nix-darwin/nix-ai module-eval).
run: nix flake check --all-systems --print-build-logs --show-trace --keep-going

- name: Save Nix Store Cache
if: github.event_name == 'push' && steps.nix-cache.outputs.cache-hit != 'true'
Expand Down