Unresolved error with EE 2.10.1 and MimeType.php

Question

I'm getting the same error as this question:

Fatal error: Call to undefined function EllisLab\ExpressionEngine\Library\Mime\finfo_open() in /home/foo/bar/EllisLab/ExpressionEngine/Library/Mime/MimeType.php on line 117

There are two suggestions offered (originally from an Ellis blog post):

1. Login to your CP and go to Tools, then Utilities, then PHP Info. If you see --disable-fileinfo on that page (I recommend using your browser’s search function) then you will need to contact your host and have them provide a version of PHP with fileinfo not disabled (i.e. enabled).
2. Check your system/expressionengine/config/mimes.php file. If it does not contain $whitelist = array around line 31 you will need to upload a fresh copy.

... but I've checked both of those, and I'm still getting the same error. Any other suggestions?

I'm in a fresh install of EE 2.10.1, on a Dreamhost server running PHP 5.6.10.

Answer 1

I just encountered this, and found that I had to follow the instructions in this Dreamhost wiki entry to truly enable fileinfo functions. (The default "shared" fileinfo support didn't cut it.)