$ git clone -n https://src.fedoraproject.org/rpms/rubygem-clutter.git /var/lib/mock/f41-build-side-1-2892687-34597/root/chroot_tmpdir/scmroot/rubygem-clutter
Cloning into '/var/lib/mock/f41-build-side-1-2892687-34597/root/chroot_tmpdir/scmroot/rubygem-clutter'...
$ git fetch origin 06316ca96d9033c674dd4dbf6aa1011d85bbec53:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-clutter
 * [new ref]         06316ca96d9033c674dd4dbf6aa1011d85bbec53 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 06316ca 4.2.4 entry