Add automatic Systemd service path update after changing espanso path (for example after an update). Fix #199

src/main.rs

@@ -47,6 +47,7 @@ use crate::package::{PackageManager, InstallResult, UpdateResult, RemoveResult,
 use std::sync::atomic::AtomicBool;
 use crate::package::git::GitPackageResolver;
 use crate::package::zip::ZipPackageResolver;
+use crate::sysdaemon::{verify, VerifyResult};
 
 mod ui;
 mod edit;
@@ -452,25 +453,33 @@ fn start_daemon(config_set: ConfigSet) {
 
     if config_set.default.use_system_agent && !force_unmanaged {
         // Make sure espanso is currently registered in systemd
-        let res = Command::new("systemctl")
-            .args(&["--user", "is-enabled", "espanso.service"])
-            .output();
-        if !res.unwrap().status.success() {
-            use dialoguer::Confirmation;
-            if Confirmation::new()
-                .with_text("espanso must be registered to systemd (user level) first. Do you want to proceed?")
-                .default(true)
-                .show_default(true)
-                .interact().expect("Unable to read user answer") {
-
+        let res = verify();
+        match res {
+            VerifyResult::EnabledAndValid => {
+                // Do nothing, everything is ok!
+            },
+            VerifyResult::EnabledButInvalidPath => {
+                eprintln!("Updating espanso service file with new path...");
+                unregister_main(config_set.clone());
                 register_main(config_set);
-            }else{
-                eprintln!("Please register espanso to systemd with this command:");
-                eprintln!("   espanso register");
-                // TODO: enable flag to use non-managed daemon mode
+            },
+            VerifyResult::NotEnabled => {
+                use dialoguer::Confirmation;
+                if Confirmation::new()
+                    .with_text("espanso must be registered to systemd (user level) first. Do you want to proceed?")
+                    .default(true)
+                    .show_default(true)
+                    .interact().expect("Unable to read user answer") {
 
-                std::process::exit(4);
-            }
+                    register_main(config_set);
+                }else{
+                    eprintln!("Please register espanso to systemd with this command:");
+                    eprintln!("   espanso register");
+                    // TODO: enable flag to use non-managed daemon mode
+
+                    std::process::exit(4);
+                }
+            },
         }
 
         // Start the espanso service

src/sysdaemon.rs

@@ -20,6 +20,7 @@
 // This functions are used to register/unregister espanso from the system daemon manager.
 
 use crate::config::ConfigSet;
+use crate::sysdaemon::VerifyResult::{EnabledAndValid, NotEnabled, EnabledButInvalidPath};
 
 // INSTALLATION
 
@@ -181,6 +182,54 @@ pub fn register(config_set: ConfigSet) {
     }
 }
 
+pub enum VerifyResult {
+    EnabledAndValid,
+    EnabledButInvalidPath,
+    NotEnabled,
+}
+
+#[cfg(target_os = "linux")]
+pub fn verify() -> VerifyResult {
+    use regex::Regex;
+    use std::process::{Command, ExitStatus};
+
+    // Check if espanso service is already registered
+    let res = Command::new("systemctl")
+        .args(&["--user", "is-enabled", "espanso"])
+        .output();
+    if let Ok(res) = res {
+        let output = String::from_utf8_lossy(res.stdout.as_slice());
+        let output = output.trim();
+        if !res.status.success() || output != "enabled" {
+            return NotEnabled
+        }
+    }
+
+    lazy_static! {
+        static ref ExecPathRegex: Regex = Regex::new("ExecStart=(?P<path>.*?)\\s").unwrap();
+    }
+
+    // Check if the currently registered path is valid
+    let res = Command::new("systemctl")
+        .args(&["--user", "cat", "espanso"])
+        .output();
+    if let Ok(res) = res {
+        let output = String::from_utf8_lossy(res.stdout.as_slice());
+        let output = output.trim();
+        if res.status.success() {
+            let caps = ExecPathRegex.captures(output).unwrap();
+            let path = caps.get(1).map_or("", |m| m.as_str());
+            let espanso_path = std::env::current_exe().expect("Could not get espanso executable path");
+
+            if espanso_path.to_string_lossy() != path {
+                return EnabledButInvalidPath
+            }
+        }
+    }
+
+    EnabledAndValid
+}
+
 #[cfg(target_os = "linux")]
 pub fn unregister(config_set: ConfigSet) {
     use std::process::{Command, ExitStatus};