$ git clone -n https://src.fedoraproject.org/rpms/ffmpegthumbs.git /var/lib/mock/f38-build-side-42-init-devel-864886-28428/root/chroot_tmpdir/scmroot/ffmpegthumbs
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-864886-28428/root/chroot_tmpdir/scmroot/ffmpegthumbs'...
$ git fetch origin c04b1514a26d8456da76c62c04430be08f051502:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ffmpegthumbs
 * [new ref]         c04b1514a26d8456da76c62c04430be08f051502 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c04b151 Rebuild to fix bodhi override of releasever 2 to 1