Mac: Create log file for kext logging

Kext logging of warnings\error should be recorded to a log file that gvfs diagnose can collect.

See #395 for related user-mode issue

[wilbaker]

It seems pretty reasonable to me in general; interestingly, it has an “info” log level that by default doesn’t hit disk unless sometime later an error is also logged. So rather than logging everything all the time, it effectively retroactively enables verbose logging if an error occurs. Is that something we’d be interested in using?

That sounds like a pretty cool feature, I think it’s worth giving it a try.

The only downside I can see to the whole thing is that there’s no programmatic API for querying the log database, only the log CLI tool. This tool at least is fairly powerful and also supports a metadata-preserving (i.e. searchable, filterable, etc.) export/archival file format that e.g. Console.app supports reading; so that’s something that users could send back to us.

I think the log tool will be enough for VFS4G. We can update the gvfs diagnose verb to call the log CLI tool and then include the resulting export file in the zip file gvfs diagnose produces.

I suggest the following:

The approach you’ve outlined sounds good to me.

/ cc:@jrbriggs

[jrbriggs]

@wilbaker I agree, I’m closing this out. Thank @pmj !