Launch fwupdmgr (fix #4)

README.md

@@ -26,6 +26,7 @@ Just invoke `topgrade`. It will invoke the following steps:
   * *Arch*: Invoke [yay](https://github.com/Jguer/yay) or fall back to pacman
   * *Redhat based*: Invoke `yum upgrade`
   * *Debian based*: Invoke `apt update && apt dist-upgrade`
+* *Linux*: Invoke [fwupdmgr](https://github.com/hughsie/fwupd) to show firmware upgrade. (View only. No upgrades will actually be performed)
 * *Linux*: Run [needrestart](https://github.com/liske/needrestart)
 * *macOS*: Upgrade [Homebrew](https://brew.sh/) packages
 * *macOS*: Upgrade App Store applications

src/main.rs

@@ -193,6 +193,15 @@ fn run() -> Result<()> {
             _ => (),
         }
 
+        if let Ok(fwupdmgr) = which("fwupdmgr") {
+            terminal.print_separator("Firmware upgrades");
+            Command::new(&fwupdmgr)
+                .arg("refresh")
+                .spawn()?
+                .wait()?
+                .and_then(|| Command::new(&fwupdmgr).arg("get-updates").spawn()?.wait())?;
+        }
+
         if let Ok(sudo) = &sudo {
             if let Ok(needrestart) = which("needrestart") {
                 terminal.print_separator("Check for needed restarts");