USHIFT-1030: add verify-py.sh

Makefile

@@ -147,11 +147,7 @@ verify-sh:
 
 .PHONY: verify-py
 verify-py:
-	python3 -m venv /tmp/venv ;
-	/tmp/venv/bin/python3 -m pip install --upgrade pip ;
-	/tmp/venv/bin/python3 -m pip install -r requirements.txt ;
-	/tmp/venv/bin/pylint --variable-naming-style=any \
-	$$(find . -type d \( -path ./_output -o -path ./vendor -o -path ./assets -o -path ./etcd/vendor \) -prune -o -name '*.py' -print)
+	./hack/verify-py.sh
 
 ###############################
 # post install validate       #

hack/verify-py.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+set -euo pipefail
+
+ROOTDIR=$(git rev-parse --show-toplevel)
+REQ_FILE=${ROOTDIR}/requirements.txt
+VENV="/tmp/venv"
+PYLINT="pylint"
+
+if ! command -v ${PYLINT} &>/dev/null; then
+
+    check="$(python3 -m pip install -r ${REQ_FILE} 2>&1 | grep 'Permission denied')"
+
+    # Install pylint in a virtual environment for CI
+    if [ ! -z "$check" ] ; then
+        printf "Installing pylint in '${VENV}' virtual environment"
+        python3 -m venv ${VENV}
+ 	    ${VENV}/bin/python3 -m pip install --upgrade pip
+ 	    ${VENV}/bin/python3 -m pip install -r ${REQ_FILE}
+        PYLINT="/tmp/venv/bin/pylint"
+    fi
+fi
+
+PYFILES=$(find . -type d \( -path ./_output -o -path ./vendor -o -path ./assets -o -path ./etcd/vendor \) -prune -o -name '*.py' -print)
+printf "Running ${PYLINT} for \n${PYFILES}\n"
+
+${PYLINT} --variable-naming-style=any ${PYFILES}