feat(user): user management tool (#825)

* 用户管理工具

* 重构

* 改为多个bin文件入口

* bin文件的usage显示自身程序名而非固定程序名

user/apps/user-manage/src/cmd/groupadd.rs

@@ -0,0 +1,45 @@
+use crate::{
+    check::check::GAddCheck,
+    error::error::{ErrorHandler, ExitStatus},
+    executor::executor::GAddExecutor,
+    parser::parser::GroupParser,
+};
+use libc::geteuid;
+use std::process::exit;
+
+#[path = "../check/mod.rs"]
+mod check;
+#[path = "../error/mod.rs"]
+mod error;
+#[path = "../executor/mod.rs"]
+mod executor;
+#[path = "../parser/mod.rs"]
+mod parser;
+
+#[allow(dead_code)]
+fn main() {
+    let args = std::env::args().collect::<Vec<_>>();
+
+    if unsafe { geteuid() } != 0 {
+        ErrorHandler::error_handle(
+            "permission denied (are you root?)".to_string(),
+            ExitStatus::PermissionDenied,
+        )
+    }
+
+    if args.len() < 2 {
+        ErrorHandler::error_handle(
+            format!("usage: {} [options] groupname", args[0]),
+            ExitStatus::InvalidCmdSyntax,
+        );
+    }
+
+    let cmd = GroupParser::parse(args);
+    let info = GAddCheck::check(cmd);
+    let groupname = info.groupname.clone();
+    GAddExecutor::execute(info);
+
+    println!("Add group [{}] successfully!", groupname);
+
+    exit(ExitStatus::Success as i32);
+}