$ git clone -n https://src.fedoraproject.org/rpms/dfuzzer.git /var/lib/mock/f40-build-789943-136170/root/chroot_tmpdir/scmroot/dfuzzer
Cloning into '/var/lib/mock/f40-build-789943-136170/root/chroot_tmpdir/scmroot/dfuzzer'...
$ git fetch origin b7b6fccca9e50854903a5e5831a05645dbbb8030:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dfuzzer
 * [new ref]         b7b6fccca9e50854903a5e5831a05645dbbb8030 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b7b6fcc Bump to v2.3