$ git clone -n https://src.fedoraproject.org/rpms/perl-RDF-Prefixes.git /var/lib/mock/f45-build-25986-614/root/chroot_tmpdir/scmroot/perl-RDF-Prefixes
Cloning into '/var/lib/mock/f45-build-25986-614/root/chroot_tmpdir/scmroot/perl-RDF-Prefixes'...
$ git fetch origin 0321da3c9e71a51fc9794812cd61272c9766624f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-RDF-Prefixes
 * [new ref]         0321da3c9e71a51fc9794812cd61272c9766624f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0321da3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild