$ git clone -n https://src.fedoraproject.org/rpms/perl-namespace-clean.git /var/lib/mock/f45-build-27707-625/root/chroot_tmpdir/scmroot/perl-namespace-clean
Cloning into '/var/lib/mock/f45-build-27707-625/root/chroot_tmpdir/scmroot/perl-namespace-clean'...
$ git fetch origin 51de33b98450614eb310923b538850c076c04e8e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-namespace-clean
 * [new ref]         51de33b98450614eb310923b538850c076c04e8e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51de33b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild