$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-MAT-Dumper.git /var/lib/mock/f45-build-23185-596/root/chroot_tmpdir/scmroot/perl-Devel-MAT-Dumper
Cloning into '/var/lib/mock/f45-build-23185-596/root/chroot_tmpdir/scmroot/perl-Devel-MAT-Dumper'...
$ git fetch origin dceb2930c9e607696b1b8b68e946cbb4b616aa5e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-MAT-Dumper
 * [new ref]         dceb2930c9e607696b1b8b68e946cbb4b616aa5e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dceb293 Update to 0.52