I am trying to share a folder on VirtualBox with a guest OS X, I tried to share the folder through VirtualBox but it doesn't show up in OS X. I also tried sharing a folder on OS X and access it from Ubuntu also failed.
So I need someone who did this before with success to tell me how to correctly do this.
As per http://www.sysprobs.com/mac-os-guest-virtualbox-326-snow-leopard-1064-windows-7-32-bit
Set up Samba on your Ubuntu host file sharing (it should be easy now, I use edited smb.conf but I am sure there is a much easier way now).
On you mac guest, go>connect to network and enter smb://ip_of_your_host and then connect (either using guest or login/pass - depends on your Samba setup)
Create an alias na put it on desktop for easy use.
According to the manual of VirtualBox, no Guest Additions for Mac OS X at this time. So the Shared Folder function is unavailable.
Solution
Like the @cpb and @sup gived. Using samba to serve your shared folder.
References
Had the same problem - solved it by installing a the "samba" server on Linux. Since then I am flawlessly able to access my folders. (Ok, it would be nicer to directly use VB's shared folder option ...)
System: Debian 6.0 Virtualbox: 4.1 Mac OS X: 10.6.6
Mount manually your folder, open a terminal and type:
sudo mkdir /media/vbox
sudo mount -t vboxsf "yoursharedfolder" /media/vbox
If you want it mounted automatically every start, run:
gksu gedit /etc/rc.local
In the text editor window that opens, and add this as the last line:
mount -t vboxsf "yoursharedfolder" /media/vbox
