INFO: mock.py version 1.2.10 starting (python version = 2.7.8)...
Start: init plugins
INFO: tmpfs initialized
INFO: selinux disabled
Finish: init plugins
Start: run
INFO: Start(/var/tmp/nipper/nipper-1.0.5-2.fc21.art.src.rpm)  Config(fedora-18-x86_64)
Start: clean chroot
Finish: clean chroot
Start: chroot init
INFO: mounting tmpfs at /var/lib/mock/fedora-18-x86_64/root.
INFO: calling preinit hooks
INFO: enabled root cache
INFO: enabled yum cache
Start: cleaning yum metadata
Finish: cleaning yum metadata
INFO: enabled ccache
Mock Version: 1.2.10
INFO: Mock Version: 1.2.10
Start: yum install
ERROR: Exception(/var/tmp/nipper/nipper-1.0.5-2.fc21.art.src.rpm) Config(fedora-18-x86_64) 0 minutes 11 seconds
INFO: Results and/or logs in: /var/lib/mock/fedora-18-x86_64/result
INFO: unmounting tmpfs.
ERROR: Command failed. See logs for output.
 # /usr/bin/yum --installroot /var/lib/mock/fedora-18-x86_64/root/ groupinstall buildsys-build