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macOS: FATAL: too many open files
Description
The build system fails with an error about too many files. The frontend build and wails runtime will continue and you will have to close them manually.
Solution: Find out where you have a ton of files and remove them.
This seems to be an issue with the file watcher erroring out when there are many files within the watch path. In my case the path was frontend/tmp, which was gitignored but being watched by the wails fs watcher.
To Reproduce
Put a bunch of files in your frontend directory.
Expected behaviour
Ideally:
- everything fails at once (i.e. vite process does not continue in the background)
- the error message is more descriptive
Might also be useful to support ignore patterns for the file watcher.
Screenshots
No response
Attempted Fixes
No response
System Details
System
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OS: MacOS
Version: 12.5
ID: 21G72
Go Version: go1.18
Platform: darwin
Architecture: arm64
Wails
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Version: v2.0.0-beta.43
Dependency Package Name Status Version
---------- ------------ ------ -------
xcode command line tools N/A Installed 2395
npm N/A Installed 8.5.0
*upx N/A Available
*nsis N/A Available
Additional context
No response
I only opened this to have a record for anyone else who, like myself, was temporarily mystified by the too many files error.
@leaanthony FWIW - MacOS does have an issue with open file limits - is this maybe linked?
This screenshot sourced from the nw-builder project which had the problem in the early days.
Many projects have this issue due to the fact that fsnotify uses a file handle per file. The solution is to use FSEvents on Mac. Need time to do it
Maybe if the watcher would automatically ignore everything in .gitignore it would solve 90% of cases? This would have solved my own issue above.
Or perhaps an -ignore option for wails dev? the -reloaddirs flag seems only only allow watching more files.
A mac-specific solution like FSEvents would be great but I suspect would be more involved.
. Directories should be ignored. If not we should add it. The default open file handle limit on Mac is 256 😬
@iansinnott - this PR adds support for reading the default .gitignore files and adds them to the paths to be ignored by the watcher. Please let me know how you get on 👍
Cheers! Thank you for working on this issue and thanks for the ongoing work on Wails
Can't say as I haven't encountered it with WAILS yet (only with nw-builder way back) but it looks a good enhancement to avoid a fatal in WAILS.
@iansinnott - just wondering if you had any feedback on this. Thank you 🙏