$ git clone -n https://src.fedoraproject.org/rpms/vim-syntastic.git /var/lib/mock/f38-build-side-42-init-devel-1392095-30890/root/chroot_tmpdir/scmroot/vim-syntastic
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1392095-30890/root/chroot_tmpdir/scmroot/vim-syntastic'...
$ git fetch origin 7348834a3192156e39977e2da16d7e2a6692d36b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vim-syntastic
 * [new ref]         7348834a3192156e39977e2da16d7e2a6692d36b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7348834 Restore perl6 now that rakudo has returned