$ git clone -n https://src.fedoraproject.org/rpms/perl-Chemistry-Ring.git /var/lib/mock/f45-build-22286-590/root/chroot_tmpdir/scmroot/perl-Chemistry-Ring
Cloning into '/var/lib/mock/f45-build-22286-590/root/chroot_tmpdir/scmroot/perl-Chemistry-Ring'...
$ git fetch origin e267ca30188fefbd692a6d0a5512ee4a24e583ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Chemistry-Ring
 * [new ref]         e267ca30188fefbd692a6d0a5512ee4a24e583ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e267ca3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild