caching of apt lists now opt-in

Author: vvolkl

action.yml

@@ -8,6 +8,10 @@ inputs:
     description: 'Location (directory) of the user-space apt cache.'
     required: false
     default: 'apt_cache'
+  apt_cache_full:
+    description: 'If set to yes, cache APT package lists in addition to .deb packages. This speeds up the action, but may require manual intervention to clear the cache when gh actions runner images are updated'
+    required: false
+    default: 'no'
   cvmfs_alien_cache:
     description: 'If set, use an alien cache at the given location.'
     required: false
@@ -362,6 +366,7 @@ runs:
       env:
         ACTION_PATH: ${{ github.action_path }}
         APT_CACHE: ${{ inputs.apt_cache }}
+        APT_CACHE_LISTS: ${{ inputs.apt_cache_full }}
         CVMFS_ALIEN_CACHE: ${{ inputs.cvmfs_alien_cache }}
         CVMFS_ALT_ROOT_PATH: ${{ inputs.cvmfs_alt_root_path }}
         CVMFS_AUTHZ_HELPER: ${{ inputs.cvmfs_authz_helper }}

setup-cvmfs.sh

@@ -6,9 +6,12 @@ if [ "$(uname)" == "Linux" ]; then
   if [ -n "${APT_CACHE}" ]; then
     echo "::group::Using cache"
     echo "Copying cache from ${APT_CACHE} to system locations..."
-    mkdir -p ${APT_CACHE}/archives/ ${APT_CACHE}/lists/
+    mkdir -p ${APT_CACHE}/archives/
     sudo cp -r ${APT_CACHE}/archives /var/cache/apt
-    sudo cp -r ${APT_CACHE}/lists /var/lib/apt
+    if [ "${APT_CACHE_LISTS}" == "yes" ]; then
+      mkdir -p ${APT_CACHE}/lists/
+      sudo cp -r ${APT_CACHE}/lists /var/lib/apt
+    fi
     echo "::endgroup::"
   fi
   # install cvmfs release package
@@ -37,9 +40,12 @@ if [ "$(uname)" == "Linux" ]; then
   if [ -n "${APT_CACHE}" ]; then
     echo "::group::Updating cache"
     echo "Copying cache from system locations to ${APT_CACHE}..."
-    mkdir -p ${APT_CACHE}/archives/ ${APT_CACHE}/lists/
+    mkdir -p ${APT_CACHE}/archives/
     cp /var/cache/apt/archives/*.deb ${APT_CACHE}/archives/
-    cp /var/lib/apt/lists/*_dists_* ${APT_CACHE}/lists/
+    if [ "${APT_CACHE_LISTS}" == "yes" ]; then
+      mkdir -p ${APT_CACHE}/lists/
+      cp /var/lib/apt/lists/*_dists_* ${APT_CACHE}/lists/
+    fi
     echo "::endgroup::"
   fi
 elif [ "$(uname)" == "Darwin" ]; then