scmi: use PathBuf for socket path

clap can parse a PathBuf directly from the command line arguments, and
paths are not always UTF-8. Use PathBuf instead of a String to allow for
all valid filesystem paths.

Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>

vhost-device-scmi/src/main.rs

@@ -39,6 +39,7 @@ mod vhu_scmi;
 use devices::common::{print_devices_help, DeviceDescription, DeviceProperties};
 
 use std::{
+    path::PathBuf,
     process::exit,
     sync::{Arc, RwLock},
 };
@@ -58,7 +59,7 @@ struct ScmiArgs {
     // Location of vhost-user Unix domain socket.
     // Required, unless one of the --help options is used.
     #[clap(short, long, help = "vhost-user socket to use (required)")]
-    socket_path: Option<String>,
+    socket_path: Option<PathBuf>,
     // Specification of SCMI devices to create.
     #[clap(short, long, help = "Devices to expose")]
     #[arg(num_args(1..))]
@@ -68,7 +69,7 @@ struct ScmiArgs {
 }
 
 pub struct VuScmiConfig {
-    socket_path: String,
+    socket_path: PathBuf,
     devices: DeviceDescription,
 }
 
@@ -76,10 +77,9 @@ impl TryFrom<ScmiArgs> for VuScmiConfig {
     type Error = String;
 
     fn try_from(cmd_args: ScmiArgs) -> Result<Self> {
-        if cmd_args.socket_path.is_none() {
+        let Some(socket_path) = cmd_args.socket_path else {
             return Result::Err("Required argument socket-path was not provided".to_string());
-        }
-        let socket_path = cmd_args.socket_path.unwrap().trim().to_string();
+        };
         let mut devices: DeviceDescription = vec![];
         let device_iterator = cmd_args.device.iter();
         for d in device_iterator {
@@ -159,6 +159,7 @@ fn main() {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use std::path::Path;
 
     #[test]
     fn test_command_line() {
@@ -173,7 +174,7 @@ mod tests {
         let params: Vec<&str> = params_string.split_whitespace().collect();
         let args: ScmiArgs = process_args(Parser::parse_from(params)).unwrap();
         let config = VuScmiConfig::try_from(args).unwrap();
-        assert_eq!(config.socket_path, path);
+        assert_eq!(&config.socket_path, Path::new(&path));
         let devices = vec![
             ("dummy".to_owned(), DeviceProperties::new(vec![])),
             (

vhost-device-scmi/src/vhu_scmi.rs

@@ -587,7 +587,7 @@ mod tests {
 
     fn make_backend() -> VuScmiBackend {
         let config = VuScmiConfig {
-            socket_path: "/foo/scmi.sock".to_owned(),
+            socket_path: "/foo/scmi.sock".into(),
             devices: vec![],
         };
         VuScmiBackend::new(&config).unwrap()