$ git clone -n https://src.fedoraproject.org/rpms/ffms2.git /var/lib/mock/f45-build-8931-397/root/chroot_tmpdir/scmroot/ffms2
Cloning into '/var/lib/mock/f45-build-8931-397/root/chroot_tmpdir/scmroot/ffms2'...
$ git fetch origin 952fc3e3cb262cbb7526cb07f6ab37b34adae13c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ffms2
 * [new ref]         952fc3e3cb262cbb7526cb07f6ab37b34adae13c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 952fc3e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild