ksud: minor tweaks

userspace/ksud/src/ksu.rs

@@ -58,7 +58,7 @@ fn print_usage(program: &str, opts: Options) {
     print!("{}", opts.usage(&brief));
 }
 
-fn set_identity(uid: u32, gid: u32, groups: &Vec<u32>) {
+fn set_identity(uid: u32, gid: u32, groups: &[u32]) {
     #[cfg(any(target_os = "linux", target_os = "android"))]
     unsafe {
         if !groups.is_empty() {
@@ -77,6 +77,8 @@ pub fn root_shell() -> Result<()> {
 #[cfg(unix)]
 pub fn root_shell() -> Result<()> {
     // we are root now, this was set in kernel!
+
+    use anyhow::anyhow;
     let env_args: Vec<String> = std::env::args().collect();
     let program = env_args[0].clone();
     let args = env_args
@@ -169,27 +171,19 @@ pub fn root_shell() -> Result<()> {
     let mut is_login = matches.opt_present("l");
     let preserve_env = matches.opt_present("p");
     let mount_master = matches.opt_present("M");
-    let mut groups = Vec::<u32>::new();
-    for g in matches.opt_strs("G") {
-        if let core::result::Result::Ok(id) = g.parse::<u32>() {
-            groups.push(id);
-        } else {
-            println!("Invalid GID: {g}");
-            print_usage(&program, opts);
-            return Ok(());
-        }
-    }
-    let mut gid: Option<u32> = None;
+
+    let groups = matches
+        .opt_strs("G")
+        .into_iter()
+        .map(|g| g.parse::<u32>().map_err(|_| anyhow!("Invalid GID: {}", g)))
+        .collect::<Result<Vec<_>, _>>()?;
+
     // if -g provided, use it.
-    if let Some(g) = matches.opt_str("g") {
-        if let core::result::Result::Ok(id) = g.parse::<u32>() {
-            gid = Some(id);
-        } else {
-            println!("Invalid GID: {g}");
-            print_usage(&program, opts);
-            return Ok(());
-        }
-    }
+    let mut gid = matches
+        .opt_str("g")
+        .map(|g| g.parse::<u32>().map_err(|_| anyhow!("Invalid GID: {}", g)))
+        .transpose()?;
+
     // otherwise, use the first gid of groups.
     if gid.is_none() && !groups.is_empty() {
         gid = Some(groups[0]);

userspace/ksud/src/utils.rs

@@ -45,7 +45,11 @@ pub fn ensure_dir_exists<T: AsRef<Path>>(dir: T) -> Result<()> {
     }
 }
 
-pub fn ensure_binary<T: AsRef<Path>>(path: T, contents: &[u8], ignore_if_exist: bool) -> Result<()> {
+pub fn ensure_binary<T: AsRef<Path>>(
+    path: T,
+    contents: &[u8],
+    ignore_if_exist: bool,
+) -> Result<()> {
     if ignore_if_exist && path.as_ref().exists() {
         return Ok(());
     }