$ git clone -n https://src.fedoraproject.org/rpms/perl-MooseX-Singleton.git /var/lib/mock/f45-build-25133-609/root/chroot_tmpdir/scmroot/perl-MooseX-Singleton
Cloning into '/var/lib/mock/f45-build-25133-609/root/chroot_tmpdir/scmroot/perl-MooseX-Singleton'...
$ git fetch origin b6c2976562dbe3e0e2442a3f052d733308b74b3a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-MooseX-Singleton
 * [new ref]         b6c2976562dbe3e0e2442a3f052d733308b74b3a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6c2976 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild