Update 'src/dkr_functions.bash'

src/dkr_functions.bash

@@ -16,10 +16,22 @@ function dkr::import_fs_as_layer() {
     # tar path = $1
     # base image = $2
     # final image = $3
+    # whiteout file = $4
+
     docker image import "$1" docker-isolate-flat-temp:latest > /dev/null
     echo "FROM docker-isolate-flat-temp:latest as isolated" > Dockerfile
     echo "FROM $2 as from_image" >> Dockerfile
     echo "COPY --from=isolated / /" >> Dockerfile
+
+    local WHITEOUT
+    if [ -n "${4:-}" ]; then
+        # Convert "./path/to/.wh.file" to "/path/to/file"
+        WHITEOUT="$(awk '{gsub(/\.wh\./, "", $0); sub(/^\./, "", $0); printf "\"%s\" ", $0}' "$4")"
+        if [ -n "$WHITEOUT" ]; then
+            echo "RUN rm -f $WHITEOUT" >> Dockerfile
+        fi
+    fi
+
     docker image build -f Dockerfile -t "$3" . > /dev/null
     docker image rm -f docker-isolate-flat-temp:latest > /dev/null
     rm -f Dockerfile