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Merge pull request #3830 from niyaznigmatullin/fix_descriptor_vs_rename

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tail: reuse opened file --follow=descriptor and renamed
This commit is contained in:
Sylvestre Ledru 2022-08-19 12:14:55 +02:00 committed by GitHub
commit 563de8bab3
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1 changed files with 16 additions and 9 deletions
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25
src/uu/tail/src/tail.rs
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@ -1037,21 +1037,28 @@ fn handle_event(
if settings.follow_descriptor() {
let new_path = event.paths.last().unwrap();
paths.push(new_path.to_owned());
// Open new file and seek to End:
let mut file = File::open(&new_path)?;
file.seek(SeekFrom::End(0))?;
// Remove old reader
let old_reader = files.remove(event_path).reader;
let reader = if old_reader.is_some() {
// Use old reader with the same file descriptor if there is one
old_reader
} else if let Ok(file) = File::open(&new_path) {
// Open new file tail from start
Some(Box::new(BufReader::new(file)) as Box<dyn BufRead>)
} else {
// Probably file was renamed/moved or removed again
None
};
// Add new reader but keep old display name
files.insert(
new_path,
PathData {
metadata: file.metadata().ok(),
reader: Some(Box::new(BufReader::new(file))),
metadata: new_path.metadata().ok(),
reader,
display_name, // mimic GNU's tail and show old name in header
},
files.get_last().unwrap() == event_path
);
// Remove old reader
files.remove(event_path);
// Unwatch old path and watch new path
let _ = watcher.unwatch(event_path);
watcher.watch_with_parent(new_path)?;
@ -1103,8 +1110,8 @@ mod files {
}
/// Wrapper for HashMap::remove using Path::canonicalize
pub fn remove(&mut self, k: &Path) {
self.map.remove(&Self::canonicalize_path(k)).unwrap();
pub fn remove(&mut self, k: &Path) -> PathData {
self.map.remove(&Self::canonicalize_path(k)).unwrap()
}
/// Wrapper for HashMap::get using Path::canonicalize