use cp

.github/actions/xahau-ga-build/action.yml

@@ -28,8 +28,8 @@ inputs:
     description: 'Cache version for invalidation'
     required: false
     default: '1'
-  cache_enabled:
-    description: 'Whether to use cache'
+  gha_cache_enabled:
+    description: 'Whether to use actions/cache (disable for self-hosted with volume mounts)'
     required: false
     default: 'true'
   ccache_enabled:
@@ -76,7 +76,7 @@ runs:
         echo "name=${SAFE_BRANCH}" >> $GITHUB_OUTPUT
 
     - name: Restore ccache directory for main branch
-      if: inputs.cache_enabled == 'true' && inputs.ccache_enabled == 'true'
+      if: inputs.gha_cache_enabled == 'true' && inputs.ccache_enabled == 'true'
       id: ccache-restore
       uses: ./.github/actions/xahau-ga-cache-restore
       with:
@@ -88,7 +88,7 @@ runs:
         cache-type: ccache-main
 
     - name: Restore ccache directory for current branch
-      if: inputs.cache_enabled == 'true' && inputs.ccache_enabled == 'true' && steps.safe-branch.outputs.name != inputs.main_branch
+      if: inputs.gha_cache_enabled == 'true' && inputs.ccache_enabled == 'true' && steps.safe-branch.outputs.name != inputs.main_branch
       id: ccache-restore-current-branch
       uses: ./.github/actions/xahau-ga-cache-restore
       with:
@@ -246,14 +246,14 @@ runs:
       run: ccache -s
 
     - name: Save ccache directory for main branch
-      if: success() && inputs.cache_enabled == 'true' && inputs.ccache_enabled == 'true' && steps.safe-branch.outputs.name == inputs.main_branch
+      if: success() && inputs.gha_cache_enabled == 'true' && inputs.ccache_enabled == 'true' && steps.safe-branch.outputs.name == inputs.main_branch
       uses: actions/cache/save@v4
       with:
         path: ~/.ccache-main
         key: ${{ steps.ccache-restore.outputs.cache-primary-key }}
 
     - name: Save ccache directory for current branch
-      if: success() && inputs.cache_enabled == 'true' && inputs.ccache_enabled == 'true' && steps.safe-branch.outputs.name != inputs.main_branch
+      if: success() && inputs.gha_cache_enabled == 'true' && inputs.ccache_enabled == 'true' && steps.safe-branch.outputs.name != inputs.main_branch
       uses: actions/cache/save@v4
       with:
         path: ~/.ccache-current

.github/actions/xahau-ga-dependencies/action.yml

@@ -17,8 +17,8 @@ inputs:
     description: 'Cache version for invalidation'
     required: false
     default: '1'
-  cache_enabled:
-    description: 'Whether to use caching'
+  gha_cache_enabled:
+    description: 'Whether to use actions/cache (disable for self-hosted with volume mounts)'
     required: false
     default: 'true'
   main_branch:
@@ -64,7 +64,7 @@ runs:
   using: 'composite'
   steps:
     - name: Restore Conan cache
-      if: inputs.cache_enabled == 'true'
+      if: inputs.gha_cache_enabled == 'true'
       id: cache-restore-conan
       uses: ./.github/actions/xahau-ga-cache-restore
       with:
@@ -77,7 +77,7 @@ runs:
         cache-type: Conan
 
     - name: Configure Conan cache paths
-      if: inputs.cache_enabled == 'false'
+      if: inputs.gha_cache_enabled == 'false'
       shell: bash
       # For self-hosted runners, register cache paths to be used as volumes
       # This allows the cache to be shared between containers
@@ -163,7 +163,7 @@ runs:
           ..
 
     - name: Save Conan cache
-      if: success() && inputs.cache_enabled == 'true' && steps.cache-restore-conan.outputs.cache-hit != 'true'
+      if: success() && inputs.gha_cache_enabled == 'true' && steps.cache-restore-conan.outputs.cache-hit != 'true'
       uses: actions/cache/save@v4
       with:
         path: ~/.conan2

.github/workflows/xahau-ga-nix.yml

@@ -174,8 +174,23 @@ jobs:
           with open(os.environ['GITHUB_OUTPUT'], 'a') as f:
               f.write(f"matrix={output}\n")
 
+  apt-cache:
+    runs-on: [self-hosted, generic, 20.04]
+    container:
+      image: ubuntu:24.04
+      volumes:
+        - /home/runner/.apt-cache:/var/cache/apt
+    steps:
+      - name: Install build dependencies to save apt cache
+        run: |
+          apt-get update
+          apt-get install -y software-properties-common
+          add-apt-repository ppa:ubuntu-toolchain-r/test -y
+          apt-get update
+          apt-get install -y python3 python-is-python3 pipx cmake ninja-build ccache perl libsqlite3-dev
+
   build:
-    needs: matrix-setup
+    needs: [matrix-setup, apt-cache]
     runs-on: [self-hosted, generic, 20.04]
     container:
       image: ubuntu:24.04
@@ -183,8 +198,8 @@ jobs:
         - /home/runner/.conan-cache:/.conan-cache
         - /home/runner/.ccache-main:/github/home/.ccache-main
         - /home/runner/.ccache-current:/github/home/.ccache-current
-      options: >-
-        --privileged
+        # apt cache as readonly
+        - /home/runner/.apt-cache:/apt-cache-ro:ro
     defaults:
       run:
         shell: bash
@@ -202,8 +217,18 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Seed apt cache
+        run: |
+          # prepare apt cache directory
+          mkdir -p /var/cache/apt/archives
+
+          # copy existing .deb files from apt cache
+          mkdir -p /var/cache/apt/archives
+          cp -a /apt-cache-ro/archives/. /var/cache/apt/archives/
+
       - name: Install build dependencies
         run: |
+          # install dependencies from apt cache
           apt-get update
           apt-get install -y software-properties-common
           add-apt-repository ppa:ubuntu-toolchain-r/test -y
@@ -312,7 +337,7 @@ jobs:
           cc: ${{ matrix.cc }}
           cxx: ${{ matrix.cxx }}
           stdlib: ${{ matrix.stdlib }}
-          cache_enabled: 'false' # Disable caching for self hosted runner
+          gha_cache_enabled: 'false' # Disable caching for self hosted runner
 
       - name: Build
         uses: ./.github/actions/xahau-ga-build
@@ -327,7 +352,7 @@ jobs:
           main_branch: ${{ env.MAIN_BRANCH_NAME }}
           stdlib: ${{ matrix.stdlib }}
           clang_gcc_toolchain: ${{ matrix.clang_gcc_toolchain || '' }}
-          cache_enabled: 'false' # Disable caching for self hosted runner
+          gha_cache_enabled: 'false' # Disable caching for self hosted runner
           ccache_max_size: '100G'
 
       - name: Set artifact name