The details for the deployment & installation of this plugin were pretty much lifted directly from the
[Calico CNI plugin](https://github.com/projectcalico/cni-plugin).

Specifically:

- The CNI installation script is containerized and deployed as a daemonset in k8s.  The relevant calico k8s manifests were used as the model for the istio-cni plugin's manifest:

# See the License for the specific language governing permissions and
# limitations under the License.

WD=$(dirname "$0")
WD=$(cd "$WD"; pwd)

set -eux

# This script sets up the plain text rendered deployments for addons
# See samples/addons/README.md for more information

ADDONS="${WD}/../../samples/addons"
DASHBOARDS="${WD}/dashboards"
mkdir -p "${ADDONS}"
TMP=$(mktemp -d)

.PHONY: precommit format lint

# Target run by the pre-commit script, to automate formatting and lint
# If pre-commit script is not used, please run this manually.
precommit: format lint

format: fmt ## Auto formats all code. This should be run before sending a PR.

fmt: format-go format-python tidy-go

ifeq ($(DEBUG),1)
# gobuild script uses custom linker flag to set the variables.
RELEASE_LDFLAGS=''
else

  // fsType is the Filesystem type to mount.
  // Must be a filesystem type supported by the host operating system.
  // Ex. "ext4", "xfs", "ntfs". The default filesystem depends on FlexVolume script.
  // +optional
  optional string fsType = 2;

  // secretRef is Optional: SecretRef is reference to the secret object containing
  // sensitive information to pass to the plugin scripts. This may be

set -e

# https://stackoverflow.com/questions/59895/how-can-i-get-the-source-directory-of-a-bash-script-from-within-the-script-itsel
# Note: the normal way we use in other scripts in Istio do not work when `source`d, which is why we use this approach
SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
REPO_ROOT="$(dirname "$(dirname "${SCRIPT_DIR}")")"

LOCAL_ARCH=$(uname -m)

#### Other migrations

If you see errors like `rendered manifests contain a resource that already exists` during installation, you may need to forcibly take ownership.

The script below can handle this for you. Replace `RELEASE` and `NAMESPACE` with the name and namespace of the release:

```console
KINDS=(service deployment)
RELEASE=istio-ingressgateway
NAMESPACE=istio-system