Local and Nephio User Validation (#249)

* Add checks for passwordless sudo of current user and NEPHIO_USER

* Add checks for root user running init and non root user for NEPHIO_USER

e2e/provision/init.sh

@@ -71,6 +71,41 @@ FAIL_FAST=${FAIL_FAST:-$(get_metadata fail_fast "false")}
 echo "$DEBUG, $DEPLOYMENT_TYPE, $RUN_E2E, $REPO, $BRANCH, $NEPHIO_USER, $HOME, $REPO_DIR, $DOCKERHUB_USERNAME, $DOCKERHUB_TOKEN"
 trap get_status ERR
 
+# Validate root permissions for current user and NEPHIO_USER
+if ! sudo -n "true"; then
+    echo ""
+    echo "Passwordless sudo is needed for '$(id -nu)' user."
+    echo "Please fix your /etc/sudoers file. You likely want an"
+    echo "entry like the following one..."
+    echo ""
+    echo "$(id -nu) ALL=(ALL) NOPASSWD: ALL"
+    exit 1
+fi
+
+if ! sudo -u "$NEPHIO_USER" sudo -n "true"; then
+    echo ""
+    echo "Passwordless sudo is needed for '$(sudo -u "$NEPHIO_USER" id -nu)' user."
+    echo "Please fix your /etc/sudoers file. You likely want an"
+    echo "entry like the following one..."
+    echo ""
+    echo "$(sudo -u "$NEPHIO_USER" id -nu) ALL=(ALL) NOPASSWD: ALL"
+    exit 1
+fi
+
+if [[ $(id -u) -ne 0 ]]; then
+    echo ""
+    echo "This script must to be executed by the root user."
+    echo ""
+    exit 1
+fi
+
+if [[ $(sudo -u "$NEPHIO_USER" id -u) -eq 0 ]]; then
+    echo ""
+    echo "NEPHIO_USER cannot be root (user '$(sudo -u "$NEPHIO_USER" id -nu)')."
+    echo ""
+    exit 1
+fi
+
 if ! command -v git >/dev/null; then
     source /etc/os-release || source /usr/lib/os-release
     case ${ID,,} in