bugfix for creating file if doesn't exist

cli/bin/env-setup

@@ -11,3 +11,9 @@ FULL_BIN_PATH=$(python -c "import os; print(os.path.realpath('$BIN_DIR'))")
 
 # ensure BIN_DIR is prepended to PATH
 expr "$PATH" : "${FULL_BIN_PATH}.*" > /dev/null || export PATH=$FULL_BIN_PATH:$PATH
+export DCOS_CONFIG=~/.dcos/dcos.toml
+
+if [ ! -f "$DCOS_CONFIG" ]; then
+    mkdir -p $(dirname "$DCOS_CONFIG")
+    touch "$DCOS_CONFIG"
+fi