$ git clone -n https://src.fedoraproject.org/rpms/arianna.git /var/lib/mock/f40-build-2191776-51450/root/chroot_tmpdir/scmroot/arianna
Cloning into '/var/lib/mock/f40-build-2191776-51450/root/chroot_tmpdir/scmroot/arianna'...
$ git fetch origin 19942c67b84895e73fad739344dde7e1f47e5ea7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/arianna
 * [new ref]         19942c67b84895e73fad739344dde7e1f47e5ea7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19942c6 24.01.85