converter for istio in-cluster operator config to sail operator config

Signed-off-by: ctartici <[email protected]>
Signed-off-by: ubuntu <[email protected]>

docs/README.md

@@ -303,6 +303,22 @@ Note the quotes around the value of `spec.values.pilot.env.PILOT_ENABLE_STATUS`.
 
 Sail Operator's Istio resource does not have a `spec.components` field. Instead, you can enable and disable components directly by setting `spec.values.<component>.enabled: true/false`. Other functionality exposed through `spec.components` like the k8s overlays is not currently available.
 
+### Converter Script
+This script is used to convert an Istio in-cluster operator configuration to a Sail Operator configuration. Upon execution, a new YAML file will be created in the same directory which ISTIO-OPERATOR-CONFIG-YAML is present. The new file will be named: sail-operator-config.yaml
+
+#### Usage
+It is necessary to set ISTIO_VERSION and ISTIO_NAMESPACE as environment variables to be able to run the script.
+
+```bash
+export ISTIO_VERSION=v1.23.0
+export ISTIO_NAMESPACE=istio-system
+./tools/configuration-converter.sh <ISTIO_OPERATOR_CONFIG_YAML_WITH_PATH>
+```
+
+> [!WARNING]
+> This script is still under development.
+> Please verify the resulting configuration carefully after conversion to ensure it meets your expectations and requirements.
+
 ### CNI
 
 The CNI plugin's lifecycle is managed separately from the control plane. You will have to create a [IstioCNI resource](#istiocni-resource) to use CNI.

tools/configuration-converter.sh

@@ -0,0 +1,83 @@
+#!/bin/bash
+
+# Copyright Istio Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script is used to convert istio configuration to sail operator configuration.
+# In the end of the execution new yaml file will be created with "sail-ISTIO_CONFIG_YAML" name.
+# Usage: ./configuration-converter.sh ISTIO_CONFIG_YAML_WITH_PATH, example:  ./configuration-converter.sh sample_config.yaml"
+
+if [[ -z $ISTIO_VERSION || -z $ISTIO_NAMESPACE ]]; then
+    echo "ISTIO_VERSION and ISTIO_NAMESPACE should be set as environment variable to execute converter."
+    exit
+fi
+
+WORKDIR=$(dirname "$1")
+ISTIO_CONFIG_FILE=$(basename "$1")
+SAIL_CONFIG_FILE="sail-operator-config.yaml"
+
+cd "$WORKDIR" || exit
+cp "$ISTIO_CONFIG_FILE" "$SAIL_CONFIG_FILE"
+
+function add_mandatory_fields(){
+    sail_api=".apiVersion=\"sailoperator.io/v1alpha1\""
+    sail_kind=".kind=\"Istio\""
+    sail_metadata_name=".metadata.name=\"default\""
+    sail_istio_version=".spec.version=\"$ISTIO_VERSION\""
+    sail_istio_namespace=".spec.namespace=\"$ISTIO_NAMESPACE\""
+    sail_config_array=("$sail_api" "$sail_kind" "$sail_istio_version" "$sail_istio_namespace" "$sail_metadata_name")
+    for i in "${sail_config_array[@]}";
+    do
+        cat $SAIL_CONFIG_FILE | yq "$i" > tmp.yaml
+        mv tmp.yaml $SAIL_CONFIG_FILE
+    done
+}
+
+#Convert boolean values to string if they are under *.env
+function boolean_2_string(){
+    SPEC_FIELDS="$(yq -r $SAIL_CONFIG_FILE | yq '(.spec.values.[].env)')"
+    if [ -n "$SPEC_FIELDS" ] ;then
+        cat $SAIL_CONFIG_FILE | yq '(.spec.values.[].env.[] | select(. == true)) |= "true"'  > tmp.yaml
+        mv tmp.yaml $SAIL_CONFIG_FILE
+        cat $SAIL_CONFIG_FILE | yq '(.spec.values.[].env.[] | select(. == false)) |= "false"' | sed '/env: \[\]/d'  > tmp.yaml
+        mv tmp.yaml $SAIL_CONFIG_FILE
+        rm tmp.yaml
+    fi
+}
+
+# Note that if there is an entry except spec.components.<component>.enabled: true/false converter will delete them and warn user 
+function validate_spec_components(){
+    COMPONENTS="$(yq -r $SAIL_CONFIG_FILE 2>/dev/null | yq '(.spec.components)' 2>/dev/null)" 
+    if [ "$COMPONENTS" == null ] ;then
+        return 1    
+    else
+        COMPONENTS_FIELDS="$(yq -r $SAIL_CONFIG_FILE 2>/dev/null | yq '(.spec.components.[] | keys[])' 2>/dev/null)"
+        if [[ -n "$COMPONENTS_FIELDS" && "$COMPONENTS_FIELDS" =~ "enabled" ]] ;then
+            cat $SAIL_CONFIG_FILE | yq 'del(.spec.components.[] | keys[] | select(. != "enabled"))' | yq '.spec.values *= .spec.components | del (.spec.components)' > tmp.yaml 
+            mv tmp.yaml $SAIL_CONFIG_FILE
+            echo "Converter can only be used values with spec.components.<component>.enabled: true/false. Please see https://github.com/istio-ecosystem/sail-operator/tree/main/docs#components-field"
+        else
+            cat $SAIL_CONFIG_FILE | yq 'del (.spec.components)' > tmp.yaml  
+            mv tmp.yaml $SAIL_CONFIG_FILE                          
+            echo "Converter can only be used values with spec.components.<component>.enabled: true/false. Please see https://github.com/istio-ecosystem/sail-operator/tree/main/docs#components-field"
+        fi
+    fi
+}
+
+add_mandatory_fields
+boolean_2_string
+validate_spec_components
+
+chmod +x $SAIL_CONFIG_FILE
+echo "Sail configuration file created with name: ${SAIL_CONFIG_FILE}"