$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-CleanNamespaces.git /var/lib/mock/f45-build-26609-618/root/chroot_tmpdir/scmroot/perl-Test-CleanNamespaces
Cloning into '/var/lib/mock/f45-build-26609-618/root/chroot_tmpdir/scmroot/perl-Test-CleanNamespaces'...
$ git fetch origin cc78b04da9457a86e773f94fb7649a8d7e0172c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-CleanNamespaces
 * [new ref]         cc78b04da9457a86e773f94fb7649a8d7e0172c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc78b04 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild