$ git clone -n https://src.fedoraproject.org/rpms/perl-CGI-Ex.git /var/lib/mock/f45-build-22023-589/root/chroot_tmpdir/scmroot/perl-CGI-Ex
Cloning into '/var/lib/mock/f45-build-22023-589/root/chroot_tmpdir/scmroot/perl-CGI-Ex'...
$ git fetch origin d6df1c6b952211fe6519083db50574cee2ac2967:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-CGI-Ex
 * [new ref]         d6df1c6b952211fe6519083db50574cee2ac2967 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d6df1c6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild