From Fedora Project Wiki
import os

config_opts['root']  = 'fedora-5-x86_64-core'
config_opts['basedir']  = '/var/lib/mock/'
config_opts['chroot']  = '/usr/sbin/mock-helper chroot'
config_opts['mount']  = '/usr/sbin/mock-helper mount'
config_opts['umount']  = '/usr/sbin/mock-helper umount'
config_opts['rm']  = '/usr/sbin/mock-helper rm'
config_opts['mknod']  = '/usr/sbin/mock-helper mknod'
config_opts['yum']  = '/usr/sbin/mock-helper yum'
config_opts['runuser']  = '/sbin/runuser'
config_opts['buildgroup']  = 'build build-minimal build-base local'
config_opts['chrootuser']  = 'mockbuild'
config_opts['chrootgroup']  = 'mockbuild'
config_opts['chrootuid']  = os.geteuid()
config_opts['chrootgid']  = os.getegid()
config_opts['chroothome']  = '/builddir'
config_opts['clean']  = True
config_opts['target_arch']  = 'x86_64'


config_opts['yum.conf']  = """
[main] 
cachedir=/var/cache/yum
keepcache=1
debuglevel=1
reposdir=/dev/null
logfile=/var/log/yum.log
pkgpolicy=newest
retries=20
obsoletes=1
gpgcheck=0
metadata_expire=1800
assumeyes=1
tsflags=nodocs
exclude=*.i386 *.486 *.586 *.i686 *.athlon

#proxy=http://hostname:8080/

[groups-x86_64] 
name=Buildgroups x86_64
baseurl=http://fedoraproject.org/buildgroups/5/x86_64/

[core-x86_64] 
name=Fedora Core x86_64
baseurl=http://redhat.download.fedoraproject.org/pub/fedora/linux/core/5/x86_64/os/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora file:///etc/pki/rpm-gpg/RPM-GPG-KEY

[updates-x86_64] 
name=Fedora Core Updates x86_64
baseurl=http://redhat.download.fedoraproject.org/pub/fedora/linux/core/updates/5/x86_64/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora file:///etc/pki/rpm-gpg/RPM-GPG-KEY

[extras-x86_64] 
name=Fedora Extras x86_64
baseurl=http://redhat.download.fedoraproject.org/pub/fedora/linux/extras/5/x86_64/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-extras

[local-noarch] 
name=local x86_64
baseurl=file:///storage/localrpms/noarch/
enabled=1

[local-x86_64] 
name=local x86_64
baseurl=file:///storage/localrpms/x86_64/
enabled=1
"""