$ git clone -n https://src.fedoraproject.org/rpms/perl-Data-Perl.git /var/lib/mock/f45-build-22896-594/root/chroot_tmpdir/scmroot/perl-Data-Perl
Cloning into '/var/lib/mock/f45-build-22896-594/root/chroot_tmpdir/scmroot/perl-Data-Perl'...
$ git fetch origin c85c876bd8b2cbcbc64673151bfc0c5cf1ee7a8c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Data-Perl
 * [new ref]         c85c876bd8b2cbcbc64673151bfc0c5cf1ee7a8c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c85c876 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild