cmux/.github/workflows/test-gpu.yml at 1749496de9b6113852bfae87e7dc230a69d59130 · Jesssullivan/cmux · GitHub

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name: GPU Smoke Test (Self-Hosted)

on:
  # SECURITY: Only trigger on direct pushes and manual dispatch.
  # Never run on pull_request — fork PRs could execute arbitrary code
  # on the self-hosted runner with GPU access.
  push:
    branches: [main, 'sid/**']
    paths:
      - 'cmux-linux/**'
      - 'ghostty'
      - '.github/workflows/test-gpu.yml'
  workflow_dispatch:
    inputs:
      ref:
        description: Branch or SHA to test
        required: false
        default: ""
      test_timeout:
        description: "Smoke test timeout in seconds"
        required: false
        default: "15"

concurrency:
  group: test-gpu-${{ github.ref }}
  cancel-in-progress: true

jobs:
  gpu-smoke:
    name: GPU smoke test (cmux-nix)
    runs-on: cmux-nix
    # Require approval via GitHub Environment protection rules.
    environment: gpu-tests
    timeout-minutes: 30
    steps:
      - uses: actions/checkout@v5
        with:
          ref: ${{ inputs.ref || github.ref }}
          submodules: recursive

      - name: Setup GloriousFlywheel
        uses: tinyland-inc/GloriousFlywheel/.github/actions/setup-flywheel@main

      - name: Configure self-hosted Nix
        run: bash scripts/configure-self-hosted-nix.sh

      - name: Verify runner Nix daemon
        run: |
          nix --version
          nix store info --store daemon

      - name: Strip non-version tags from ghostty
        run: git -C ghostty tag -l 'xcframework-*' | xargs git -C ghostty tag -d 2>/dev/null || true

      - name: GPU info
        run: |
          echo "=== GPU devices ==="
          ls -la /dev/dri/ || echo "No DRI devices"
          echo "=== Vulkan info ==="
          vulkaninfo --summary 2>/dev/null | head -20 || echo "vulkaninfo not available"

      - name: Build libghostty (Nix)
        run: |
          nix --store daemon develop --command bash -c 'cd ghostty && zig build -Dapp-runtime=none -Drenderer=opengl -Doptimize=ReleaseFast'
          bash scripts/ghostty-compat-symlinks.sh
          ls -lh ghostty/zig-out/lib/libghostty.*

      - name: Build cmux-linux (Nix)
        run: nix --store daemon develop --command bash -c 'cd cmux-linux && zig build -Doptimize=ReleaseFast && ls -lh zig-out/bin/cmux'

      - name: Test config parser (Nix)
        run: nix --store daemon develop --command bash -c 'cd cmux-linux && zig build test'

      - name: GPU smoke test
        env:
          SMOKE_TIMEOUT: ${{ inputs.test_timeout || '15' }}
        run: nix --store daemon develop --command bash scripts/smoke-test-gpu.sh "$SMOKE_TIMEOUT"

      - name: Upload crash logs
        if: failure()
        uses: actions/upload-artifact@v4
        with:
          name: gpu-crash-logs
          path: |
            /tmp/cmux-gpu-stderr.log
            /tmp/core.*
          retention-days: 7