Description of problem:
Trying to run livecd-creator with -b option added. It would be nice to know what file should not exist.

Version-Release number of selected component:
livecd-tools-21.2-4.fc21

Additional info:
reporter:       libreport-2.2.3
cmdline:        /usr/bin/python -tt /usr/bin/livecd-creator -v -b livecd-xfce-jam-201409111144.iso -l -t temp- -dvc xfce-jam.ks
dso_list:       python-imgcreate-21.2-4.fc21.x86_64
executable:     /usr/bin/livecd-creator
kernel:         3.16.2-200.fc20.x86_64
runlevel:       N 5
type:           Python
uid:            0

Truncated backtrace:
creator.py:529:mount:OSError: [Errno 17] File exists

Traceback (most recent call last):
  File "/usr/bin/livecd-creator", line 235, in <module>
    sys.exit(main())
  File "/usr/bin/livecd-creator", line 210, in main
    creator.mount(options.base_on, options.cachedir)
  File "/usr/lib/python2.7/site-packages/imgcreate/creator.py", line 529, in mount
    os.symlink("/proc/self/mounts", self._instroot + "/etc/mtab")
OSError: [Errno 17] File exists

Local variables in innermost frame:
cachesrc: '/run/media/jones/2tp001data/createlive/temp-/imgcreate-0YR8PD/yum-cache'
d: '/proc'
f: '/run/media/jones/2tp001data/createlive/temp-/imgcreate-0YR8PD/yum-cache'
dest: '/var/cache/yum'
base_on: 'livecd-xfce-jam-201409111144.iso'
cachedir: None
self: <imgcreate.live.x86LiveImageCreator object at 0x167a110>