$ git clone -n https://src.fedoraproject.org/rpms/sympa.git /var/lib/mock/f40-build-2483333-61638/root/chroot_tmpdir/scmroot/sympa
Cloning into '/var/lib/mock/f40-build-2483333-61638/root/chroot_tmpdir/scmroot/sympa'...
$ git fetch origin 8d57d9924a56f4c012dfc3002669a985bf189ce8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sympa
 * [new ref]         8d57d9924a56f4c012dfc3002669a985bf189ce8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8d57d99 Add changelog entry