[yabridgectl] Check for libdbus-1.so

Instead of checking for notify-send.

tools/yabridgectl/src/actions.rs

@@ -833,8 +833,9 @@ pub fn do_sync(config: &mut Config, options: &SyncOptions) -> Result<()> {
     // This check is only performed once per combination of Wine and yabridge versions
     verify_wine_setup(config)?;
 
-    // Yabridge uses notify-send to relay important information when something's very wrong, so
-    // we'll check whether this is installed
+    // Yabridge uses D-Bus notifications to relay important information when something's very wrong,
+    // so we'll check whether `libdbus-1.so` is available (even though it would be very odd if it
+    // isn't)
     verify_external_dependencies()?;
 
     Ok(())

tools/yabridgectl/src/util.rs

@@ -29,7 +29,6 @@ use std::os::unix::process::CommandExt;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Stdio};
 use textwrap::Wrapper;
-use which::which;
 
 use crate::config::{self, Config, KnownConfig, YABRIDGE_HOST_32_EXE_NAME, YABRIDGE_HOST_EXE_NAME};
 use crate::files::{LibArchitecture, NativeFile};
@@ -465,18 +464,20 @@ pub fn verify_wine_setup(config: &mut Config) -> Result<()> {
     Ok(())
 }
 
-/// Check whether `notify-send` is installed, as this is used to relay important information when
-/// something's very wrong.
+/// Check whether yabridge's (optional) external dependencies are installed. Right now this only
+/// checks for libdbus, as this is used to relay important information when something's very wrong.
 pub fn verify_external_dependencies() -> Result<()> {
-    if which("notify-send").is_err() {
+    let libdbus_name = libloading::library_filename("dbus-1");
+    let libdbus_available = unsafe { libloading::Library::new(&libdbus_name) }.is_ok();
+    if !libdbus_available {
         eprintln!(
             "\n{}",
             wrap(&format!(
                 "Warning: Could not find '{}'. This will not prevent yabridge from working, but \
-                 you will also not receive any notifcations when something is wrong. It is \
-                 usually part of the libnotify package, but your distro might have moved it into \
-                 a separate libnotify-tools package.",
-                "notify-send".bright_white(),
+                 you will also not receive any notifcations when something is wrong. D-Bus should \
+                 already be installed on the system, so if you're seeing this warning then \
+                 something is probably very wrong.",
+                libdbus_name.to_str().unwrap().bright_white(),
             ))
         );
     }