$ git clone -n https://src.fedoraproject.org/rpms/perl-Ref-Util.git /var/lib/mock/f45-build-26046-614/root/chroot_tmpdir/scmroot/perl-Ref-Util
Cloning into '/var/lib/mock/f45-build-26046-614/root/chroot_tmpdir/scmroot/perl-Ref-Util'...
$ git fetch origin 0db3903d35455c06d95ca707a7201afa065d8012:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Ref-Util
 * [new ref]         0db3903d35455c06d95ca707a7201afa065d8012 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0db3903 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild