Use docker export for artifact extraction and upload build log

Author: s3rj1k

.github/actions/docker-build-artifacts/action.yml

@@ -15,19 +15,19 @@ inputs:
     description: Package maintainer
   WORKING_DIRECTORY:
     required: true
-    default: '.'
+    default: "."
     description: Working directory
   ARTIFACTS_PATTERN:
     required: false
     default: '.*\.(deb|rpm)$'
     description: Regexp that matches artifacts
   ARTIFACTS_DIR:
     required: false
-    default: 'BUILD'
+    default: "BUILD"
     description: Output directory for artifacts
   BUILD_LOG_FILENAME:
     required: false
-    default: 'build.log'
+    default: "build.log"
     description: Build log filename
 
 runs:
@@ -74,28 +74,30 @@ runs:
           --pull \
         . 2>&1 | tee -a ${{ inputs.BUILD_LOG_FILENAME }}
 
+    - name: Upload build log
+      if: always()
+      uses: actions/upload-artifact@v4
+      with:
+        name: build-log-${{ github.run_id }}-${{ github.sha }}
+        path: ${{ inputs.WORKING_DIRECTORY }}/${{ inputs.BUILD_LOG_FILENAME }}
+        retention-days: 7
+        if-no-files-found: ignore
+
     - name: Extract artifacts from image
       shell: bash
       working-directory: ${{ inputs.WORKING_DIRECTORY }}
       run: |
         set -euo pipefail
 
-        export TEMP_DIR=$(mktemp -d)
-
-        # dump Docker image blobs
-        docker save artifacts-${GITHUB_RUN_ID}:${GITHUB_SHA} --output "${TEMP_DIR}/artifacts-${GITHUB_RUN_ID}-${GITHUB_SHA}.tar" && \
-        tar -xf "${TEMP_DIR}/artifacts-${GITHUB_RUN_ID}-${GITHUB_SHA}.tar" -C "${TEMP_DIR}" && \
-        rm -f "${TEMP_DIR}/artifacts-${GITHUB_RUN_ID}-${GITHUB_SHA}.tar"
-
-        # extract blobs content
-        mkdir -p "${{ inputs.ARTIFACTS_DIR }}" && find "${TEMP_DIR}/" -type f -exec file {} + \
-        | grep -E ":.*tar archive" \
-        | cut -d: -f1 \
-        | xargs -rI{} tar --keep-newer-files -xf {} -C "${{ inputs.ARTIFACTS_DIR }}"
+        # create container from image and export filesystem
+        container_id=$(docker create artifacts-${GITHUB_RUN_ID}:${GITHUB_SHA} sh)
+        mkdir -p "${{ inputs.ARTIFACTS_DIR }}"
+        docker export "$container_id" | tar -xf - -C "${{ inputs.ARTIFACTS_DIR }}"
+        find "${{ inputs.ARTIFACTS_DIR }}" -type d -empty -delete
 
         # cleanup
-        docker image rm artifacts-${GITHUB_RUN_ID}:${GITHUB_SHA} && \
-        rm -rf "${TEMP_DIR}"
+        docker rm "$container_id"
+        docker image rm artifacts-${GITHUB_RUN_ID}:${GITHUB_SHA}
 
         if [ "$(find "${{ inputs.ARTIFACTS_DIR }}" -type f | wc -l)" -lt 1 ]; then
             echo "No files found in ${{ inputs.ARTIFACTS_DIR }}."