$ git clone -n https://src.fedoraproject.org/rpms/ffms2.git /var/lib/mock/f41-build-855203-167084/root/chroot_tmpdir/scmroot/ffms2
Cloning into '/var/lib/mock/f41-build-855203-167084/root/chroot_tmpdir/scmroot/ffms2'...
$ git fetch origin 4abb3e39048f3c8959dac77bee61bd8da749551e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ffms2
 * [new ref]         4abb3e39048f3c8959dac77bee61bd8da749551e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4abb3e3 initial import (resolves rhbz#2274319)