diff --git a/pkg/debug/Dockerfile.spec b/pkg/debug/Dockerfile.spec
new file mode 100644
index 00000000000..be215360ee8
--- /dev/null
+++ b/pkg/debug/Dockerfile.spec
@@ -0,0 +1,18 @@
+FROM lfedge/eve-alpine:745ae9066273c73b0fd879c4ba4ff626a8392d04
+
+ENV BUILD_PKGS="jq pciutils usbutils lsblk"
+
+RUN eve-alpine-deploy.sh
+
+WORKDIR /usr/bin
+COPY spec.sh .
+
+SHELL ["/bin/ash", "-eo", "pipefail", "-c"]
+
+RUN echo "Testing spec.sh -v..." && \
+    ./spec.sh -v | tee /dev/stderr | jq . > /dev/null
+
+RUN echo "Testing spec.sh..." && \
+    ./spec.sh | tee /dev/stderr | jq . > /dev/null
+
+CMD ["./spec.sh", "-v"]
\ No newline at end of file
diff --git a/pkg/debug/spec.sh b/pkg/debug/spec.sh
index ae28277b11a..1b14a658b0c 100755
--- a/pkg/debug/spec.sh
+++ b/pkg/debug/spec.sh
@@ -271,8 +271,8 @@ __EOT__
 __EOT__
     cat <<__EOT__
       "usagePolicy": {}
-    COMMA="},"
 __EOT__
+    COMMA="},"
     fi
 }
 
@@ -479,6 +479,10 @@ done
 
 #enumerate NICs (ignoring USB devices)
 for ETH in /sys/class/net/*; do
+   if [ ! -L "$ETH" ]; then
+        # skip bonding_masters file
+        continue
+   fi
    LABEL=$(echo "$ETH" | sed -e 's#/sys/class/net/##' -e 's#^k##')
    # Does $LABEL start with wlan or wwan? Change ztype and cost
    COST=0