$ git clone -n https://src.fedoraproject.org/rpms/perl-Data-Hexify.git /var/lib/mock/f45-build-22833-594/root/chroot_tmpdir/scmroot/perl-Data-Hexify
Cloning into '/var/lib/mock/f45-build-22833-594/root/chroot_tmpdir/scmroot/perl-Data-Hexify'...
$ git fetch origin 6606f6ad9292bd9f8496b988d456ff57f72032fe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Data-Hexify
 * [new ref]         6606f6ad9292bd9f8496b988d456ff57f72032fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6606f6a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild