$ git clone -n https://src.fedoraproject.org/rpms/perl-Mail-DKIM.git /var/lib/mock/f45-build-24617-605/root/chroot_tmpdir/scmroot/perl-Mail-DKIM
Cloning into '/var/lib/mock/f45-build-24617-605/root/chroot_tmpdir/scmroot/perl-Mail-DKIM'...
$ git fetch origin 75862a465b8aa1fcfdf7b173492e19e60ff6756a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Mail-DKIM
 * [new ref]         75862a465b8aa1fcfdf7b173492e19e60ff6756a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75862a4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild