mkisofs from RedHat 7.0 does not work You can not specify pathspec as cdpath/=/home/files/real_path it does not understand this. In the same time mkisofs from RedHat 6.2 is OK with this.
This is a change in default behaviour for mkisofs, the option -graft-points must be used explicitly now. Closing. *** This bug has been marked as a duplicate of 15216 ***