$ git clone -n https://src.fedoraproject.org/rpms/R-yaml.git /var/lib/mock/f33-build-131221-40988/root/chroot_tmpdir/scmroot/R-yaml
Cloning into '/var/lib/mock/f33-build-131221-40988/root/chroot_tmpdir/scmroot/R-yaml'...
$ git reset --hard 704223cbd0d0ad4ef5ed0a175989b1d1dcebb238
HEAD is now at 704223c Merge branch 'f30'