awatch on a file on Linux trigger delete event

[hoxbro]

Description

When running the example code below on Linux, I get a delete event right after the file is changed and saved. After the delete event, the file is removed from the watched files, and nothing happens during the next save.

This does not happen on a Mac (I haven't tested on Windows).

Example Code

import asyncio
from watchfiles import awatch

async def main():
    async for changes in awatch('example.py', debug=True):
        print(changes)

asyncio.run(main())

Watchfiles Output

# On Linux:
watcher: INotifyWatcher { channel: Sender { .. }, waker: Waker { inner: Waker { fd: File { fd: 9, path: "anon_inode:[eventfd]", read: true, write: true } } } }
raw-event=Access(Close(Write)) event.kind=Access(Close(Write)) no change detected
raw-event=Event { kind: Modify(Metadata(Any)), paths: ["/home/shh/projects/holoviz/repos/panel/example.py"], attr:tracker: None, attr:flag: None, attr:info: None, attr:source: None } change=2
raw-event=Event { kind: Remove(File), paths: ["/home/shh/projects/holoviz/repos/panel/example.py"], attr:tracker: None, attr:flag: None, attr:info: None, attr:source: None } change=3
{(<Change.modified: 2>, '/home/shh/projects/holoviz/repos/panel/example.py'), (<Change.deleted: 3>, '/home/shh/projects/holoviz/repos/panel/example.py')}

# On Mac
watcher: FsEventWatcher { paths: 0x600000f846c0, since_when: 18446744073709551615, latency: 0.0, flags: 18, event_handler: 0x60000149c310, runloop: Some((0x6000034880c0, JoinHandle { .. })), recursive_info: {"/Users/shh/Downloads/example.py": true} }
raw-event=Event { kind: Modify(Name(Any)), paths: ["/Users/shh/Downloads/example.py"], attr:tracker: None, attr:flag: None, attr:info: None, attr:source: None } change=1
raw-event=Event { kind: Modify(Name(Any)), paths: ["/Users/shh/Downloads/example.py"], attr:tracker: None, attr:flag: None, attr:info: None, attr:source: None } change=1
{(<Change.added: 1>, '/Users/shh/Downloads/example.py')}
raw-event=Event { kind: Modify(Name(Any)), paths: ["/Users/shh/Downloads/example.py"], attr:tracker: None, attr:flag: None, attr:info: None, attr:source: None } change=1
raw-event=Event { kind: Modify(Name(Any)), paths: ["/Users/shh/Downloads/example.py"], attr:tracker: None, attr:flag: None, attr:info: None, attr:source: None } change=1
{(<Change.added: 1>, '/Users/shh/Downloads/example.py')}
raw-event=Event { kind: Modify(Name(Any)), paths: ["/Users/shh/Downloads/example.py"], attr:tracker: None, attr:flag: None, attr:info: None, attr:source: None } change=1
raw-event=Event { kind: Modify(Name(Any)), paths: ["/Users/shh/Downloads/example.py"], attr:tracker: None, attr:flag: None, attr:info: None, attr:source: None } change=1
{(<Change.added: 1>, '/Users/shh/Downloads/example.py')}
raw-event=Event { kind: Modify(Name(Any)), paths: ["/Users/shh/Downloads/example.py"], attr:tracker: None, attr:flag: None, attr:info: None, attr:source: None } change=1
raw-event=Event { kind: Modify(Name(Any)), paths: ["/Users/shh/Downloads/example.py"], attr:tracker: None, attr:flag: None, attr:info: None, attr:source: None } change=1
{(<Change.added: 1>, '/Users/shh/Downloads/example.py')}
raw-event=Event { kind: Modify(Name(Any)), paths: ["/Users/shh/Downloads/example.py"], attr:tracker: None, attr:flag: None, attr:info: None, attr:source: None } change=1
raw-event=Event { kind: Modify(Name(Any)), paths: ["/Users/shh/Downloads/example.py"], attr:tracker: None, attr:flag: None, attr:info: None, attr:source: None } change=1
{(<Change.added: 1>, '/Users/shh/Downloads/example.py')}

Operating System & Architecture

On Linux

Linux-6.6.10-76060610-generic-x86_64-with-glibc2.35
#202401051437170472813122.04~24d69e2 SMP PREEMPT_DYNAMIC Mon J

On Mac

macOS-14.2.1-arm64-arm-64bit
Darwin Kernel Version 23.2.0: Wed Nov 15 21:53:34 PST 2023; root:xnu-10002.61.3~2/RELEASE_ARM64_T8103

Environment

No response

Python & Watchfiles Version

python: 3.11.7 | packaged by conda-forge | (main, Dec 23 2023, 14:43:09) [GCC 12.3.0], watchfiles: 0.21.0 || python: 3.11.6 | packaged by conda-forge | (main, Oct 3 2023, 10:37:07) [Clang 15.0.7 ], watchfiles: 0.21.0

Rust & Cargo Version

No response

[hoxbro]

It seems to be because the apps I used on Linux use a buffer and then overwrite the file.

The apps where it is a problem are Neovim and Gnome TextEditor. It does not seem to be a problem with VSCode.

[hoxbro]

A duplicate of #235

[samuelcolvin]

👍 thanks for reporting, and following up.

[hoxbro]

No problem. The underlying issue is notify-rs/notify#247.