[Bug 238516] emulators/virtualbox-ose-additions: Shared folder does not update consistently

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238516

            Bug ID: 238516
           Summary: emulators/virtualbox-ose-additions: Shared folder does
                    not update consistently
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: vbox at FreeBSD.org
          Reporter: bioli at thetippy.top
          Assignee: vbox at FreeBSD.org
             Flags: maintainer-feedback?(vbox at FreeBSD.org)

Using FreeBSD 12.0 64-bit guest OS on a Windows 10 system.
The following packages were installed with pkg:

* virtualbox-ose-additions-nox11
* apache24

I created a shared folder and mounted it with mount_vboxvfs.

The shared folder was set as the root of Apache's documents.

>From FreeBSD, I could easily add and edit files that would be served by the web
server, Apache.

However, from the host OS side (Windows), there was an issue. I could create
new files and those would be served properly. But when I edited a file, it did
not update. A web browser displayed the old version. I noticed unusual behavior
when trying to diagnose the issue.

Using index.html as an example:

* Editing from the guest OS worked and reloading the page in my browser showed
the changes

* Editing from the host OS and reloading the page did *not* show the changes

>From the guest OS, I tried:

1. cat index.html: This showed the changes but a page reload still did not show
them

2. vi index.html: I could see the changes. I did not make further changes and
quit without saving. Reloading the page showed the old version

3. nano index.html: Once again, I could see the new version. I closed without
saving but this time, reloading the page *did* show the new version

I repeated this several times. Loading the page with nano (but not making
changes or re-saving) always resulted in the web page being updated the next
time I hit refresh in the browser. "cat" and "vi" did not affect anything.

So, there seems to be some problem. I suspect it has to do with the guest
utilities because of the very strange behavior exhibited in the cat, vi, nano
tests.

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