fix(updater): panic when updating with empty current_exe_args (tauri-apps#2335)

Author: talzion12

plugins/updater/src/updater.rs

@@ -276,9 +276,7 @@ impl UpdaterBuilder {
             on_before_exit: self.on_before_exit,
         })
     }
-}
 
-impl UpdaterBuilder {
     pub(crate) fn current_exe_args<I, S>(mut self, args: I) -> Self
     where
         I: IntoIterator<Item = S>,
@@ -618,7 +616,13 @@ impl Update {
         let updater_type = self.extract(bytes)?;
 
         let install_mode = self.config.install_mode();
-        let current_args = &self.current_exe_args()[1..];
+        let current_exe_args = self.current_exe_args();
+        let current_args =
+            current_exe_args
+                .split_first()
+                .map(|(_, args_without_exe)| args_without_exe)
+                .unwrap_or(&[]);
+        
         let msi_args;
 
         let installer_args: Vec<&OsStr> = match &updater_type {
@@ -627,25 +631,35 @@ impl Update {
                 .iter()
                 .map(OsStr::new)
                 .chain(once(OsStr::new("/UPDATE")))
-                .chain(once(OsStr::new("/ARGS")))
-                .chain(current_args.to_vec())
+                .chain(
+                    if current_args.len() > 0 {
+                        Some(once(OsStr::new("/ARGS")).chain(current_args.iter().map(|arg| *arg)))
+                    } else {
+                        None
+                    }.into_iter().flatten()
+                )
                 .chain(self.installer_args())
                 .collect(),
             WindowsUpdaterType::Msi { path, .. } => {
-                let escaped_args = current_args
-                    .iter()
-                    .map(escape_msi_property_arg)
-                    .collect::<Vec<_>>()
-                    .join(" ");
-                msi_args = OsString::from(format!("LAUNCHAPPARGS=\"{escaped_args}\""));
+                if current_args.len() > 0 {
+                    let escaped_args = current_args
+                        .iter()
+                        .map(escape_msi_property_arg)
+                        .collect::<Vec<_>>()
+                        .join(" ");
+                    msi_args = Some(OsString::from(format!("LAUNCHAPPARGS=\"{escaped_args}\"")));
+                }
+                else {
+                    msi_args = None;
+                }
 
                 [OsStr::new("/i"), path.as_os_str()]
                     .into_iter()
                     .chain(install_mode.msiexec_args().iter().map(OsStr::new))
                     .chain(once(OsStr::new("/promptrestart")))
                     .chain(self.installer_args())
                     .chain(once(OsStr::new("AUTOLAUNCHAPP=True")))
-                    .chain(once(msi_args.as_os_str()))
+                    .chain(msi_args.iter().map(|args| args.as_os_str()))
                     .collect()
             }
         };