try uid test again

helix-stdx/src/faccess.rs

@@ -547,10 +547,7 @@ pub fn copy_xattr(src: &Path, dst: &Path) -> io::Result<()> {
     }
 
     let mut attr_buf = vec![0u8; max_val_len];
-    for key in key_list[..size]
-        .split(|&b| b == 0)
-        .filter(|v| !v.is_empty())
-    {
+    for key in key_list[..size].split_inclusive(|&b| b == 0) {
         // Needed on macos
         #[allow(clippy::unnecessary_cast)]
         let conv = unsafe { std::slice::from_raw_parts(key.as_ptr() as *const u8, key.len()) };

helix-term/tests/test/commands/write.rs

@@ -687,6 +687,36 @@ async fn test_hardlink_write() -> anyhow::Result<()> {
     Ok(())
 }
 
+#[tokio::test(flavor = "multi_thread")]
+#[cfg(unix)]
+async fn test_write_ownership() -> anyhow::Result<()> {
+    // GH CI does not possess CAP_CHOWN
+    if option_env!("GITHUB_ACTIONS").is_some() {
+        return Ok(());
+    }
+    use std::os::unix::fs::MetadataExt;
+
+    let mut file = tempfile::NamedTempFile::new()?;
+    let mut app = helpers::AppBuilder::new()
+        .with_file(file.path(), None)
+        .build()?;
+
+    let nobody_uid = 9999;
+    let nogroup_gid = 9999;
+
+    helix_stdx::faccess::fchown(&file.as_file_mut(), Some(nobody_uid), Some(nogroup_gid))?;
+
+    let old_meta = file.as_file().metadata()?;
+
+    test_key_sequence(&mut app, Some("hello:w<ret>"), None, false).await?;
+    reload_file(&mut file).unwrap();
+
+    let new_meta = file.as_file().metadata()?;
+    assert!(old_meta.uid() == new_meta.uid() && old_meta.gid() == new_meta.gid());
+
+    Ok(())
+}
+
 async fn edit_file_with_content(file_content: &[u8]) -> anyhow::Result<()> {
     let mut file = tempfile::NamedTempFile::new()?;