Merge pull request #75 from twz123/gh-api-image-list

Use GitHub API to list images

.github/workflows/publish-images.yaml

@@ -11,53 +11,50 @@ on:
   workflow_dispatch:
     inputs:
       tag:
-        description: 'The tag to use for images. Defaults to :latest if not specified.'
+        description: The tag to use for images. Defaults to the tag name if publishing a tag, "latest" otherwise.
         required: false
-        default: 'latest'
 
 jobs:
   prepare:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     outputs:
       tag: ${{ steps.set-tag.outputs.tag }}
-      images: ${{ steps.set-images.outputs.images }}
+      images: ${{ steps.list-images.outputs.images }}
     steps:
-    - name: Checkout code
-      uses: actions/checkout@v4
-
-    - name: Tag from dispatch
-      if: github.event_name == 'workflow_dispatch'
-      run: echo "tag=${{ github.event.inputs.tag || 'latest' }}" >> $GITHUB_ENV
-
-    - name: Tag from ref
-      if: startsWith(github.ref, 'refs/tags/')
-      run: echo "tag=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
-
-    - name: Default tag
-      if: github.event_name != 'workflow_dispatch' && !startsWith(github.ref, 'refs/tags/')
-      run: echo "tag=latest" >> $GITHUB_ENV
+      - name: Set tag
+        id: set-tag
+        env:
+          TAG: "${{ inputs.tag }}"
+        run: |
+          if [ -z "$TAG" ] && [[ "$GITHUB_REF" = refs/tags/* ]]; then
+            TAG="${GITHUB_REF#refs/tags/}"
+          fi
+          echo tag="${TAG-latest}" >>"$GITHUB_OUTPUT"
 
-    - name: Set tag
-      id: set-tag
-      run: echo "tag=${tag}" >> $GITHUB_OUTPUT
-
-    - name: List all images
-      if: github.event_name == 'workflow_dispatch' || startsWith(github.ref, 'refs/tags/')
-      run: |
-        image_dirs=$(find images -name 'Dockerfile' -exec dirname {} \; | xargs -n 1 basename | tr '\n' ' ')
-        echo "image_dirs=$image_dirs" >> $GITHUB_ENV
-
-    - name: List changed images
-      if: github.event_name != 'workflow_dispatch' && !startsWith(github.ref, 'refs/tags/')
-      run: |
-        image_dirs=$(git diff --name-only ${{ github.event.before }} ${{ github.sha }} | grep 'images/.*/Dockerfile' | awk -F/ '{print $(NF-1)}' | tr '\n' ' ' | sed 's/ $//')
-        echo "image_dirs=$image_dirs" >> $GITHUB_ENV
-
-    - name: Set image list
-      id: set-images
-      run: |
-        image_dirs_json=$(echo "$image_dirs" | jq -R -c 'split(" ") | map(select(. != ""))')
-        echo "images=${image_dirs_json}}" >> $GITHUB_OUTPUT
+      - name: List images
+        id: list-images
+        env:
+          BEFORE: "${{ github.event.before }}"
+        run: |
+          if [ "$GITHUB_EVENT_NAME" = workflow_dispatch ] || [[ "$GITHUB_REF" = refs/tags/* ]]; then
+            gh api /repos/{owner}/{repo}/git/trees/"${GITHUB_SHA}"?recursive=1 --paginate --jq '
+              [ .tree[]
+                | select(.type == "blob")
+                | .path
+                | split("/")
+                | select(length == 3 and .[0] == "images" and .[2] == "Dockerfile")
+                | .[1]
+              ] | unique | "images=" + tojson
+            ' >>"$GITHUB_OUTPUT"
+          else
+            gh api /repos/{owner}/{repo}/compare/"${BEFORE}...${GITHUB_SHA}" --paginate --jq '
+              [ .files[].filename
+                | split("/")
+                | select(length == 3 and .[0] == "images" and .[2] == "Dockerfile")
+                | .[1]
+              ] | unique | "images=" + tojson
+            ' >>"$GITHUB_OUTPUT"
+          fi
 
   publish_images:
     needs: prepare