backup fails after installed with bundle option '--path vendor/bundle'

[cuilongbo]

If a installation is made using bundle option '--path vendor/bundle', such as:

redmine install ~/redmine-3.4.6.tar.gz redmine2/ --bundle-options '--path vendor/bundle'

An error occurs when trying to backup it.

redmine backup ~/redmine2

The error message is:

Application root contains unreadable files. Make sure that all files in /data/redmine/redmine3 are readable for user redmine (limit 10 files: /data/redmine/redmine2/vendor/bundle/ruby/2.3.0/gems/ffi-1.9.25/ext/ffi_c/libffi-x86_64-linux-gnu/include/ffitarget.h)

The backup will succeed after moving folder /data/redmine/redmine2/vendor/ outside of folder /data/redmine/redmine2/.