Add username to template env

manager/src/builder.rs

@@ -3,6 +3,7 @@ use crate::Config;
 use async_recursion::async_recursion;
 use blueprint::{parse_template, Env, Value};
 use futures::future::join_all;
+use std::env;
 use std::ffi::OsStr;
 use std::io::ErrorKind;
 use std::path::PathBuf;
@@ -16,6 +17,7 @@ pub const TEMPLATE_EXTENSION: &str = "tpl";
 pub async fn build_tree(cfg: &Config) -> Result<(), Errors> {
     let mut env = Env::new();
     env.insert("hostname".into(), Value::Str(get_hostname().await));
+    env.insert("username".into(), Value::Str(get_username()));
 
     for flag in &cfg.flags {
         env.insert(flag.to_string(), Value::Bool(true));
@@ -116,6 +118,13 @@ async fn file(cfg: &Config, env: &Env, relative: PathBuf) -> Result<(), Error> {
     Ok(())
 }
 
+fn get_username() -> String {
+    env::var("USER")
+        .ok()
+        .or_else(|| env::var("USERNAME").ok())
+        .unwrap_or_else(|| String::new())
+}
+
 async fn get_hostname() -> String {
     async fn read_hostname_file() -> Option<String> {
         read_to_string("/etc/hostname").await.ok()