remove debu output

.github/workflows/test.yml

@@ -5,7 +5,7 @@ on:
   pull_request:
   workflow_dispatch:
   push:
-    branches: [master]
+    branches: [main]
 
 jobs:
   test-always-true:

README.md

@@ -35,9 +35,9 @@ The action returns either `true` or `false`, indicating if the derived image dif
 
 ```yaml
 - name: Run
-id: run
-uses: ClementTsang/docker-check-base-image-diff@v0.0.1-alpha
-with:
+  id: run
+  uses: ClementTsang/docker-check-base-image-diff@v0.0.2
+  with:
     base-image: docker://rust:slim-buster
     derived-image: docker://ghcr.io/clementtsang/cargo-deb-arm
 ```

action.yml

@@ -6,16 +6,16 @@ branding:
   color: blue
 
 inputs:
-  base-image:
+  image:
     description: "Base Docker image - follows skopeo format (e.g. docker://rust:slim-buster)"
     required: true
-  derived-image:
-    description: "Derived Docker image - follows skopeo format (e.g. docker://rust:slim-buster)"
+  tags:
+    description: "list of tags"
     required: true
 outputs:
-  differs:
+  exist:
     description: "Returns either true or false"
-    value: ${{ steps.check.outputs.differs }}
+    value: ${{ steps.check.outputs.exist }}
 
 runs:
   using: "composite"
@@ -23,5 +23,4 @@ runs:
     - id: check
       shell: bash
       run: |
-        RESULT=$(${{ github.action_path }}/check.sh ${{ inputs.base-image }} ${{ inputs.derived-image }})
-        echo "::set-output name=differs::$RESULT"
+        ${{ github.action_path }}/check.sh "${{ inputs.image }}" "${{ inputs.tags }}"

check.sh

@@ -2,7 +2,14 @@
 
 set -e
 
-BASE_LAYERS="$(skopeo inspect $1 | jq '.Layers')"
-DERIVED_LAYERS="$(skopeo inspect $2 | jq '.Layers')"
+CHECK=$( echo -n "$2" | sed -e "s#$1:##g" | jq -R -s 'split("\n")' )
+EXISTING=$( skopeo list-tags docker://$1 || echo '{"Tags":[]}' ) 
+TAGS=$( jq '.check - .existing.Tags' <<< "{\"check\": $CHECK, \"existing\": $EXISTING}" )
 
-jq '.base - .derived | .!=[]' <<< "{\"base\": $BASE_LAYERS, \"derived\": $DERIVED_LAYERS}"
+echo $TAGS | jq '"Tag not found: "+ .[]'
+RESULT=$(echo $TAGS | jq '.==[]')
+if "$RESULT" == "true"
+	then
+		echo "All tags found"
+fi
+echo exist=$RESULT >> $GITHUB_OUTPUT