DEBUG: mounting proc in /var/lib/mock/fedora-development-x86_64-core/root/proc
DEBUG: Executing /usr/sbin/mock-helper mount -t proc proc /var/lib/mock/fedora-development-x86_64-core/root/proc
DEBUG: ensuring dir /var/lib/mock/fedora-development-x86_64-core/root/dev/pts
DEBUG: mounting devpts in /var/lib/mock/fedora-development-x86_64-core/root/dev/pts
DEBUG: Executing /usr/sbin/mock-helper mount -t devpts devpts /var/lib/mock/fedora-development-x86_64-core/root/dev/pts
DEBUG: Executing /usr/sbin/mock-helper chroot /var/lib/mock/fedora-development-x86_64-core/root /sbin/runuser - root -c "chown 500.500 /etc/yum.conf"
DEBUG: ensuring dir /var/lib/mock/fedora-development-x86_64-core/root/etc/yum
Traceback (most recent call last):
  File "/usr/bin/mock", line 1046, in <module>
    main()
  File "/usr/bin/mock", line 1043, in main
    do_rebuild(config_opts, srpms)
  File "/usr/bin/mock", line 910, in do_rebuild
    my.prep()
  File "/usr/bin/mock", line 254, in prep
    self._prep_install()
  File "/usr/bin/mock", line 659, in _prep_install
    os.symlink('../yum.conf', os.path.join(yumdir, 'yum.conf'))
OSError: [Errno 17] File exists