Phabricator Arcanist has errors ini_set(): open_basedir restriction in effect. File() is not within the allowed path(s)

Question

I am running the latest Arch Linux

I have looked at topics like these:

• Unlink Fails -> open_basedir issue Warning: unlink() [function.unlink]: open_basedir restriction in effect. File() is not within the allowed path(s):
• open_basedir restriction in effect. File(/) is not within the allowed path(s):

Those suggest editing the php.ini, adding the directories I need onto open_basedir. I have tried commenting out open_basedir entirely and this works but I am worried about the security implications.

How do I find which file I need to add to open_basedir?

Currently I have:

open_basedir = /srv/http/:/home/:/tmp/:/usr/share/pear/:/usr/share/webapps/

Edit for people looking at this: I looked at a co-workers ubuntu ini file, and he has the open_basedir expression in there -- so it must be just poorly written (i.e. does not support safe operations)