$ git clone -n https://src.fedoraproject.org/rpms/xmms2.git /var/lib/mock/f41-build-814643-149002/root/chroot_tmpdir/scmroot/xmms2
Cloning into '/var/lib/mock/f41-build-814643-149002/root/chroot_tmpdir/scmroot/xmms2'...
$ git fetch origin 064c174e6f33629713f5be455e2d753012d39e0b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmms2
 * [new ref]         064c174e6f33629713f5be455e2d753012d39e0b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 064c174 Perl 5.40 rebuild