$ git clone -n https://src.fedoraproject.org/rpms/perl-HTTP-Negotiate.git /var/lib/mock/f45-build-24027-601/root/chroot_tmpdir/scmroot/perl-HTTP-Negotiate
Cloning into '/var/lib/mock/f45-build-24027-601/root/chroot_tmpdir/scmroot/perl-HTTP-Negotiate'...
$ git fetch origin 0a61e7ef958857dd0ba9c6449363308f670c796a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-HTTP-Negotiate
 * [new ref]         0a61e7ef958857dd0ba9c6449363308f670c796a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a61e7e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild