Virtualbox 共用資料夾無法symbolic link問題

在寫case的時候遇到無法建symbolic link的問題，顯示唯讀的檔案系統。搜尋了一下發現是virtualbox在win7上的問題，跟管理員權限與virtualbox要打開設訂有關。

Fixing your virtualbox shared folder symlink error

August 16, 2012 by Ahti Kitsik

Operations such as installing node.js or python virtualenv to a virtualbox writable shared folder can fail if you try to do this as a linux (ubuntu) virtualbox guest running Windows 7 host.

The cause is symlink permission.

Typical error:

ln -fs out/Release/node node
ln: failed to create symbolic link `node': Read-only file system

It can also be a “Protocol error”.

This happens even if your shared folder is writable.

Fix: Enable symlinks feature in VirtualBox

Run at cmd prompt:

1.     
2. VBoxManage setextradata YOURVMNAME VBoxInternal2/SharedFoldersEnableSymlinksCreate/YOURSHAREFOLDERNAME 1  
3.     

Verify by running:

1.     
2. VBoxManage getextradata YOURVMNAME enumerate  
3.     

If your user belongs to Administrators group then start VirtualBox with “Run as Administrator”!

上面的參數請視情況修改：

• c:\Oracle\VirtualBox\ ： 這是VirtualBox的預設資料夾，如果安裝在不同資料夾，請自行修改。
• YOURVMNAME ： 請修改為你要開啟的VM名稱。
• YOURSHAREFOLDERNAME ：修改為VM設定中共用資料夾的名稱

參考資料
http://www.plumeqi.com/post/VirtualBox-shared-folder-symlin-error.html
http://ahtik.com/blog/2012/08/16/fixing-your-virtualbox-shared-folder-symlink-error/
http://gwokae.mewggle.com/wordpress/index.php/archives/1097