allow pkexec to be used instead of sudo (#201)

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>

src/main.rs

@@ -89,7 +89,7 @@ fn run() -> Result<(), Error> {
     let mut report = Report::new();
 
     #[cfg(any(target_os = "dragonfly", target_os = "freebsd", target_os = "linux"))]
-    let sudo = utils::which("sudo");
+    let sudo = utils::sudo();
     let run_type = executor::RunType::new(config.dry_run());
 
     #[cfg(feature = "self-update")]

src/utils.rs

@@ -80,6 +80,11 @@ pub fn which<T: AsRef<OsStr> + Debug>(binary_name: T) -> Option<PathBuf> {
     }
 }
 
+#[cfg(any(target_os = "dragonfly", target_os = "freebsd", target_os = "linux"))]
+pub fn sudo() -> Option<PathBuf> {
+    which("sudo").or_else(|| which("pkexec"))
+}
+
 /// `std::fmt::Display` implementation for `std::path::Path`.
 ///
 /// This struct differs from `std::path::Display` in that in Windows it takes care of printing backslashes