$ git clone -n https://src.fedoraproject.org/rpms/perl-Email-Abstract.git /var/lib/mock/f45-build-23283-596/root/chroot_tmpdir/scmroot/perl-Email-Abstract
Cloning into '/var/lib/mock/f45-build-23283-596/root/chroot_tmpdir/scmroot/perl-Email-Abstract'...
$ git fetch origin 65fc66e79e94ec1b7af260cf6b2fd3f23e9ffde8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Email-Abstract
 * [new ref]         65fc66e79e94ec1b7af260cf6b2fd3f23e9ffde8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 65fc66e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild