$ git clone -n https://src.fedoraproject.org/rpms/ffmpegthumbs.git /var/lib/mock/f41-build-side-1-2893081-34613/root/chroot_tmpdir/scmroot/ffmpegthumbs
Cloning into '/var/lib/mock/f41-build-side-1-2893081-34613/root/chroot_tmpdir/scmroot/ffmpegthumbs'...
$ git fetch origin befbad4c98752f043676e2bd2c708835e5eb0698:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ffmpegthumbs
 * [new ref]         befbad4c98752f043676e2bd2c708835e5eb0698 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at befbad4 Rebuild for ffmpeg 7 (again)