Skip caching steps in action if no test resources are found (#37)

* Skip caching steps in action if no test resources are found

* return empty cachekey and dest_paths if no test resources are detected

* update changelog

* update md

CHANGELOG.md

@@ -1,3 +1,9 @@
+# viash-actions v6.3.1
+
+## Bug fixes
+
+* `project/sync-and-cache`: Skip caching steps in action if no test resources are found (PR #37).
+
 # viash-actions v6.3.0
 
 ## New functionality

project/sync-and-cache/README.md

@@ -37,8 +37,10 @@ info:
 
 ### Outputs
 
-- `cache_key`: Caching key.
-- `dest_paths`: Paths to the synced resources.
+- `cache_key`: Caching key to use to restore the cache. If no test
+  resources are detected, this will be an empty string.
+- `dest_paths`: Paths to the synced resources. If no test resources are
+  detected, this will be an empty string.
 
 ## Examples
 

project/sync-and-cache/action.yml

@@ -31,18 +31,26 @@ inputs:
     default: cachekey__
 outputs:
   cache_key:
-    description: Caching key.
+    description: Caching key to use to restore the cache. If no test resources are detected, this will be an empty string.
     value: ${{ steps.cache_key.outputs.cache_key }}
   dest_paths:
-    description: Paths to the synced resources.
+    description: Paths to the synced resources. If no test resources are detected, this will be an empty string.
     value: ${{ steps.test_resources.outputs.dest_paths }}
 runs:
   using: 'composite'
   steps:
-    - name: Test resources
+    - name: Detect test resources
       id: test_resources
       shell: bash
       run: |
+        resources_detected=$(yq e '.info | has("test_resources")' "${{ inputs.project_config }}")
+        if [ "$resources_detected" == "false" ]; then
+          echo "No test resources detected."
+          echo "cache_key=" >> $GITHUB_OUTPUT
+          echo "dest_paths=" >> $GITHUB_OUTPUT
+          exit 0
+        fi
+
         # reformat the test resources into a pseudo-json that can be read line-by-line by bash
         test_resources=$(
           yq e \
@@ -70,6 +78,7 @@ runs:
     - name: Create hash key
       shell: bash
       id: cache_key
+      if: ${{ steps.test_resources.outputs.cache_key != '' }}
       run: |
         function hash_s3() {
           local s3_path="$1"
@@ -102,6 +111,7 @@ runs:
     
     - name: Print resources
       shell: bash
+      if: ${{ steps.test_resources.outputs.cache_key != '' }}
       run: |
         echo "### Cache key: ${{ steps.cache_key.outputs.cache_key }}"
         echo
@@ -119,6 +129,7 @@ runs:
     # initialize cache
     - name: Cache resources
       uses: actions/cache@v4
+      if: ${{ steps.test_resources.outputs.cache_key != '' }}
       with:
         path: ${{ steps.test_resources.outputs.dest_paths }}
         key: ${{ steps.cache_key.outputs.cache_key }}
@@ -127,6 +138,7 @@ runs:
     # sync if need be
     - name: Sync resources
       shell: bash
+      if: ${{ steps.test_resources.outputs.cache_key != '' }}
       run: |
         function sync_s3() {
           local s3_path="$1"
@@ -153,6 +165,7 @@ runs:
         
     - name: List resources
       shell: bash
+      if: ${{ steps.test_resources.outputs.cache_key != '' }}
       run: |
         echo "${{ steps.test_resources.outputs.test_resources }}" | \
           while read -r line; do