$ git clone -n https://src.fedoraproject.org/rpms/initial-setup.git /var/lib/mock/f45-build-14137-457/root/chroot_tmpdir/scmroot/initial-setup
Cloning into '/var/lib/mock/f45-build-14137-457/root/chroot_tmpdir/scmroot/initial-setup'...
$ git fetch origin a2c18feb3d18ca6b48728f7ecd72def738991b4f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/initial-setup
 * [new ref]         a2c18feb3d18ca6b48728f7ecd72def738991b4f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a2c18fe new version