"the echo of my admins is admin.(not "admin") ...when log as admin, i only have 'discuss' rights,and do not see the other rights.( sry, cannot upload photo here)"
I think that's where the Arc code is actually supposed to be installed, at least according to the openshift-arc readme. Maybe the readme is out of date.... :/
The arc git repo is cloned under app-root/data, but it's not used as the root directory for the web application in case the user has other files they want to load.
I'll admit, the readme isn't the best. I mostly copied it from the original and changed the relevant bits.
Unfortunately, certain files like adminfile* should probably not be relative to the repo directory, because it's likely to get wiped. I'm not sure where the right place to put it would be though. Maybe data/config?