$ git clone -n https://src.fedoraproject.org/rpms/perl-Digest-MD2.git /var/lib/mock/f45-build-23143-596/root/chroot_tmpdir/scmroot/perl-Digest-MD2
Cloning into '/var/lib/mock/f45-build-23143-596/root/chroot_tmpdir/scmroot/perl-Digest-MD2'...
$ git fetch origin 7a083b6c12c336c34e9885aec63c95f4c2ab9552:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Digest-MD2
 * [new ref]         7a083b6c12c336c34e9885aec63c95f4c2ab9552 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7a083b6 Perl 5.44 rebuild