bug: redirect stderr on FreeBSD to avoid drawing on UI (#897)

Cargo.lock

@@ -219,6 +219,7 @@ dependencies = [
  "ctrlc",
  "dirs",
  "fern",
+ "filedescriptor",
  "futures",
  "futures-timer",
  "fxhash",
@@ -589,6 +590,17 @@ dependencies = [
  "log",
 ]
 
+[[package]]
+name = "filedescriptor"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7199d965852c3bac31f779ef99cbb4537f80e952e2d6aa0ffeb30cce00f4f46e"
+dependencies = [
+ "libc",
+ "thiserror",
+ "winapi",
+]
+
 [[package]]
 name = "float-cmp"
 version = "0.9.0"

Cargo.toml

@@ -111,6 +111,7 @@ winapi = "0.3.9"
 [target.'cfg(target_os = "freebsd")'.dependencies]
 serde_json = { version = "1.0.82" }
 sysctl = { version = "0.5.2", optional = true }
+filedescriptor = "0.8.2"
 
 [dev-dependencies]
 assert_cmd = "2.0.4"

src/app/data_harvester.rs

@@ -251,14 +251,22 @@ impl DataCollector {
             if self.widgets_to_harvest.use_temp {
                 self.sys.refresh_components();
             }
-            if cfg!(target_os = "windows") && self.widgets_to_harvest.use_net {
-                self.sys.refresh_networks();
+
+            #[cfg(target_os = "windows")]
+            {
+                if self.widgets_to_harvest.use_net {
+                    self.sys.refresh_networks();
+                }
             }
-            if cfg!(target_os = "freebsd") && self.widgets_to_harvest.use_disk {
-                self.sys.refresh_disks();
-            }
-            if cfg!(target_os = "freebsd") && self.widgets_to_harvest.use_mem {
-                self.sys.refresh_memory();
+
+            #[cfg(target_os = "freebsd")]
+            {
+                if self.widgets_to_harvest.use_disk {
+                    self.sys.refresh_disks();
+                }
+                if self.widgets_to_harvest.use_mem {
+                    self.sys.refresh_memory();
+                }
             }
         }
 

src/bin/main.rs

@@ -131,6 +131,16 @@ fn main() -> Result<()> {
     terminal.clear()?;
     terminal.hide_cursor()?;
 
+    #[cfg(target_os = "freebsd")]
+    let _stderr_fd = {
+        // A really ugly band-aid to suppress stderr warnings on FreeBSD due to sysinfo.
+        use filedescriptor::{FileDescriptor, StdioDescriptor};
+        use std::fs::OpenOptions;
+
+        let path = OpenOptions::new().write(true).open("/dev/null")?;
+        FileDescriptor::redirect_stdio(&path, StdioDescriptor::Stderr)?
+    };
+
     // Set panic hook
     panic::set_hook(Box::new(panic_hook));