added docker install so gen-sdk script can use docker

Author: epicseven-cup

hack/python-sdk/gen-sdk.sh

@@ -42,10 +42,28 @@ echo "Removing previously generated files ..."
 rm -rf "${SDK_OUTPUT_PATH}"/docs/V1*.md "${SDK_OUTPUT_PATH}"/jobset/models "${SDK_OUTPUT_PATH}"/test/test_*.py
 
 echo "Generating Python SDK for JobSet..."
+
+
+# Defaults the container engine to docker
+CONTAINER_ENGINE=${CONTAINER_ENGINE:-docker}
+# Checking if docker / podman is installed
+if ! { [ $(command -v docker &> /dev/null) ] && [ $(command -v podman &> /dev/null) ] }; then
+  # Install docker
+  echo "Both Podman and Docker is not installed"
+  echo "Installing Docker now (Version 17.03.0)"
+  # Defaulting to 17.03.0
+  wget https://download.docker.com/linux/static/stable/x86_64/docker-17.03.0-ce.tgz
+  tar xzvf docker-17.03.0-ce.tgz
+  echo "Starting dockerd"
+  ./docker/dockerd &
+elif [ `command -v podman &> /dev/null` ]; then
+  echo "Found that Podman is installed, using that now"
+  CONTAINER_ENGINE="podman"
+fi
+
 # Install the sdk using docker
-docker run --rm \
-# Hooking up the whole repo onto the local folder
-  -v "${repo_root}":/local openapitools/openapi-generator-cli generate \
+${CONTAINER_ENGINE} run --rm \
+  -v docker.io/"${repo_root}":/local openapitools/openapi-generator-cli generate \
   -i /local/${SWAGGER_CODEGEN_FILE} \
   -g python \
   -o /local/"${SDK_OUTPUT_PATH}" \