Improving CI with Caching

Author: Mikefly123

.github/workflows/ci.yaml

@@ -25,47 +25,64 @@ jobs:
         submodules: recursive
         fetch-depth: 0
 
-    - name: Install system dependencies
+    # Install only packages NOT pre-installed on ubuntu-latest
+    # Pre-installed: git, cmake, make, gcc, g++, wget, file, python3
+    # See: https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2204-Readme.md
+    - name: Install minimal Zephyr dependencies
       run: |
-        sudo apt-get update
-        sudo apt-get install -y \
-          git cmake ninja-build gperf ccache dfu-util \
-          device-tree-compiler wget xz-utils file make gcc \
-          gcc-multilib g++-multilib libsdl2-dev libmagic1
+        sudo apt-get update -qq
+        sudo apt-get install -y --no-install-recommends \
+          ninja-build \
+          gperf \
+          ccache \
+          device-tree-compiler \
+          xz-utils \
+          libmagic1
+      env:
+        DEBIAN_FRONTEND: noninteractive
 
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
         python-version: '3.11'
         cache: 'pip'
+        cache-dependency-path: 'requirements.txt'
 
-    - name: Cache Zephyr workspace
+    # Cache both workspace AND SDK together
+    - name: Cache Zephyr workspace and SDK
       id: cache-zephyr
       uses: actions/cache@v4
       with:
         path: |
           lib/zephyr-workspace
           ~/zephyr-sdk-0.17.2
-        key: zephyr-minimal-${{ hashFiles('west.yml') }}-${{ runner.os }}
+        key: zephyr-minimal-${{ hashFiles('west.yml') }}-${{ runner.os }}-v2
         restore-keys: |
-          zephyr-minimal-${{ hashFiles('west.yml') }}-
+          zephyr-minimal-${{ hashFiles('west.yml') }}-${{ runner.os }}-
           zephyr-minimal-
 
     - name: Setup minimal Zephyr environment
+      if: steps.cache-zephyr.outputs.cache-hit != 'true'
       run: |
         make zephyr-setup
       env:
-        # Speed up pip installs
         PIP_DISABLE_PIP_VERSION_CHECK: 1
         PIP_NO_COMPILE: 1
 
+    - name: Verify Zephyr setup (from cache or fresh)
+      run: |
+        west --version
+        echo "Workspace modules:"
+        west list | wc -l
+        echo "SDK toolchain:"
+        ls -la ~/zephyr-sdk-0.17.2/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc || echo "Not found"
+
     - name: Display setup statistics
       run: |
         echo "=== Zephyr Setup Statistics ==="
-        echo "Workspace size: $(du -sh lib/zephyr-workspace 2>/dev/null || echo 'N/A')"
-        echo "SDK size: $(du -sh ~/zephyr-sdk-0.17.2 2>/dev/null || echo 'N/A')"
-        echo "Modules installed:"
-        west list 2>/dev/null || echo "West not initialized"
+        echo "Cache hit: ${{ steps.cache-zephyr.outputs.cache-hit }}"
+        echo "Workspace size: $(du -sh lib/zephyr-workspace 2>/dev/null | cut -f1 || echo 'N/A')"
+        echo "SDK size: $(du -sh ~/zephyr-sdk-0.17.2 2>/dev/null | cut -f1 || echo 'N/A')"
 
     - name: Build for PROVES Flight Control Board v5c
       run: |
@@ -89,8 +106,6 @@ jobs:
         if [ -f build-artifacts/zephyr.uf2 ]; then
           echo "Firmware size: $(ls -lh build-artifacts/zephyr.uf2 | awk '{print $5}')"
         fi
-        if [ -f build-fprime-automatic-zephyr/zephyr/zephyr.stat ]; then
-          echo ""
-          echo "Memory usage:"
-          cat build-fprime-automatic-zephyr/zephyr/zephyr.stat || true
-        fi
+        echo ""
+        echo "Memory usage:"
+        cat build-fprime-automatic-zephyr/zephyr/zephyr.stat 2>/dev/null || echo "Stats not available"