Fix clippy lint 'suspicious_open_options'

Author: MarkusPettersson98

mullvad-exclude/src/main.rs

@@ -95,6 +95,7 @@ fn run() -> Result<Infallible, Error> {
     let file = fs::OpenOptions::new()
         .write(true)
         .create(true)
+        .truncate(false)
         .open(procs_path)
         .map_err(Error::AddProcToCGroup)?;
 

talpid-core/src/split_tunnel/linux.rs

@@ -114,6 +114,7 @@ impl PidManager {
         let mut file = fs::OpenOptions::new()
             .write(true)
             .create(true)
+            .truncate(false)
             .open(exclusions_path)
             .map_err(Error::AddCGroupPid)?;
 
@@ -173,6 +174,7 @@ impl PidManager {
         fs::OpenOptions::new()
             .write(true)
             .create(true)
+            .truncate(false)
             .open(self.net_cls_path.join("cgroup.procs"))
     }
 }

test/test-runner/src/sys.rs

@@ -178,6 +178,7 @@ ExecStart=/usr/bin/mullvad-daemon --disable-stdout-timestamps {verbosity}"#
 
     let mut file = tokio::fs::OpenOptions::new()
         .create(true)
+        .truncate(true)
         .write(true)
         .open(override_path)
         .await
@@ -409,6 +410,7 @@ pub async fn set_daemon_environment(env: HashMap<String, String>) -> Result<(),
 
     let mut file = tokio::fs::OpenOptions::new()
         .create(true)
+        .truncate(true)
         .write(true)
         .open(override_path)
         .await