Support read data from stdin

script/test/cmd/tests.sh

@@ -805,8 +805,10 @@ sed -e "s;%VERSION%;$version;g" -e "s;%CMD%;$cmd;g"  $KOMPOSE_ROOT/script/test/f
 convert::expect_success "$cmd" "/tmp/output-os.json"
 
 # Testing stdin feature
-cmd="$KOMPOSE_ROOT/kompose convert --stdout -j -f -"
-sed -e "s;%VERSION%;$version;g" -e "s;%CMD%;$cmd;g"  $KOMPOSE_ROOT/script/test/fixtures/stdin/output.json > /tmp/output-k8s.json
+cmd="kompose convert --stdout -j -f -"
+sed -e "s;%VERSION%;$version;g" -e "s;%CMD%;$cmd;g"  $KOMPOSE_ROOT/script/test/fixtures/stdin/output-k8s.json > /tmp/output-k8s.json
+cat $KOMPOSE_ROOT/script/test/fixtures/stdin/docker-compose.yaml | $cmd | diff /tmp/output-k8s.json -
+EXIT_STATUS=$?
 
 echo -e "\n"
 go test -v github.com/kubernetes/kompose/script/test/cmd

script/test/fixtures/stdin/docker-compose.yaml

@@ -0,0 +1,4 @@
+version: '3'
+services:
+  backend:
+    image: helloworld

script/test/fixtures/stdin/output-k8s.json

@@ -0,0 +1,45 @@
+{
+  "kind": "List",
+  "apiVersion": "v1",
+  "metadata": {},
+  "items": [
+    {
+      "kind": "Deployment",
+      "apiVersion": "extensions/v1beta1",
+      "metadata": {
+        "name": "backend",
+        "creationTimestamp": null,
+        "labels": {
+          "io.kompose.service": "backend"
+        },
+        "annotations": {
+          "kompose.cmd": "%CMD%",
+          "kompose.version": "%VERSION%"
+        }
+      },
+      "spec": {
+        "replicas": 1,
+        "template": {
+          "metadata": {
+            "creationTimestamp": null,
+            "labels": {
+              "io.kompose.service": "backend"
+            }
+          },
+          "spec": {
+            "containers": [
+              {
+                "name": "backend",
+                "image": "helloworld",
+                "resources": {}
+              }
+            ],
+            "restartPolicy": "Always"
+          }
+        },
+        "strategy": {}
+      },
+      "status": {}
+    }
+  ]
+}