Allow users to specify a context; load the proper build cache

Author: brianhlin

action.yml

@@ -22,12 +22,33 @@ inputs:
   registry_pass:
     description: 'Password of the registry'
     required: true
+  context:
+    description: 'Path to container files, including Dockerfile'
+    required: false
+    default: '.'
 
 runs:
   using: "composite"
   steps:
   - uses: actions/checkout@v2
 
+  - id: generate-image-name
+    shell: bash
+    run: |
+      if [[ ${{ inputs.context }} == "." ]] || \
+         [[ ${{ inputs.context }} == "./" ]]; then
+         # Try to guess the image name from our docker repo naming conventions
+         # E.g., opensciencegrid/docker-frontier-squid
+         IMAGE_NAME=${GITHUB_REPOSITORY/opensciencegrid\/docker-//}
+      elif [[ -d ${{ inputs.context }} ]]; then
+         # Assume that the containing dir is the image name
+         IMAGE_NAME=$(basename ${{ inputs.context }})
+      else
+        echo "${{ inputs.context }} is not a directory"
+        exit 1
+      fi
+      echo "::set-output name=image::$IMAGE_NAME"
+
   - name: Generate tag list
     id: generate-tag-list
     env:
@@ -52,7 +73,7 @@ runs:
     uses: actions/cache@v2
     with:
       path: /tmp/.buildx-cache
-      key: ${{ inputs.osg_series}}-${{ inputs.repo }}-buildx-${{ github.sha }}-${{ github.run_id }}
+      key: ${{ steps.generate-image-name.outputs.image }}_${{ inputs.osg_series}}_${{ inputs.repo }}_buildx_${{ github.sha }}_${{ github.run_id }}
 
   - name: Set up Docker Buildx
     uses: docker/setup-buildx-action@v1
@@ -68,6 +89,7 @@ runs:
     uses: docker/[email protected]
     with:
       push: true
+      context: ${{ inputs.context }}
       build-args: |
         BASE_YUM_REPO=${{ inputs.repo }}
         BASE_OSG_SERIES=${{ inputs.osg_series }}