Second and further file changes not detected on MacOS Mojave

[aherrmann]

Possibly related to #139 and angular/angular#21770

I've tested this using bazel-watcher version 0.7.0 and 0.5.0, on MacOS Mojave.
As an example project I picked java-tutorial from https://github.com/bazelbuild/examples.git .
Checkout that repository, change into the java-tutorial directory and execute ibazel build //:ProjectRunner. Then open the files src/main/java/com/example/{Greeting.java,ProjectRunner.java} in an editor.

• Enter an empty line into the first file and save.
  ibazel notices and rebuilds the target.
• Enter a second empty line into the first file and save.
  ibazel does not notice the modification and does not rebuild the target.
  Any further edits to this file are not noticed.
• Enter an empty line into the second file and save.
  ibazel notices and rebuilds the target.
• Enter a second empty line into the second file and save.
  ibazel does not notice the modification and does not rebuild the target.
  Any further edits to this file are not noticed.

We have observed the issue on two separate MacOS Mojave machines. We have observed it with version 0.5.0 and 0.7.0. We have not seen an instance of ibazel working properly on MacOS.

---

Update: The issue was observed on MacOS Sierra (10.12.6) and Mojave (10.14).
The issue was not observed on Linux, bazel-watcher seems to be working fine on Linux.

[achew22]

The real problem is that I don't have a Mac to debug with. Any ideas/information you have is a thing I would be very happy to help with, I just don't have a box to test on ☹️

[aherrmann]

@achew22 FreeBSD might be a good alternative as a development platform. It also uses kqueue and you can run it in a VM. At a glance it seems like Bazel and fsnotify support FreeBSD.

[aherrmann]

Awesome, thanks @dougkoch and @achew22 . I tested this on a Mojave machine and the issue seems to be fixed. 🎉

[achew22]

Woohoo! I'm cutting a v0.8.0 release right now.