env: Check for root privileges

Check for root privileges early on.

Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>

src/tools/kata-ctl/src/ops/env_ops.rs

@@ -13,6 +13,7 @@ use crate::utils;
 use kata_types::config::TomlConfig;
 
 use anyhow::{anyhow, Context, Result};
+use nix::unistd::Uid;
 use serde::{Deserialize, Serialize};
 use std::fs::File;
 use std::io::{self, Write};
@@ -441,6 +442,10 @@ pub fn get_env_info(toml_config: &TomlConfig) -> Result<EnvInfo> {
 }
 
 pub fn handle_env(env_args: EnvArgument) -> Result<()> {
+    if !Uid::effective().is_root() {
+        return Err(anyhow!("kata-ctl env command requires root privileges to get host information. Please run as root or use sudo"));
+    }
+
     let mut file: Box<dyn Write> = if let Some(path) = env_args.file {
         Box::new(
             File::create(path.as_str()).with_context(|| format!("Error creating file {}", path))?,