tools: config_file_generation

With the advent of this tool. Generating the config for local usage and
packaging will be much simpler.

Closes-bug: #1619252
Change-Id: I95f8f0ec76fb8a75153f6dac12c6ec1d2f485e8b
Signed-off-by: Antoni Segura Puimedon <antonisp@celebdor.com>

devstack/plugin.sh

@@ -74,7 +74,7 @@ if is_service_enabled kuryr-libnetwork; then
             else
                 echo -n "${KURYR_CONFIG} and the  default config missing. Auto generating and copying one... "
                 cd ${KURYR_HOME}
-                oslo-config-generator --config-file=${KURYR_CONFIG_GENERATOR}
+                tools/generate_config_file_samples.sh
                 sudo cp ${KURYR_DEFAULT_CONFIG}.sample ${KURYR_DEFAULT_CONFIG}
                 sudo cp ${KURYR_DEFAULT_CONFIG} ${KURYR_CONFIG}
                 cd -

devstack/settings

@@ -2,8 +2,6 @@
 KURYR_HOME=${KURYR_HOME:-$DEST/kuryr-libnetwork}
 KURYR_ACTIVATOR_FILENAME=kuryr.spec
 KURYR_DEFAULT_ACTIVATOR=${KURYR_HOME}/etc/${KURYR_ACTIVATOR_FILENAME}
-KURYR_CONFIG_GENERATOR_FILENAME=kuryr-config-generator.conf
-KURYR_CONFIG_GENERATOR=${KURYR_HOME}/etc/${KURYR_CONFIG_GENERATOR_FILENAME}
 
 # See libnetwork's plugin discovery mechanism:
 #   https://github.com/docker/docker/blob/c4d45b6a29a91f2fb5d7a51ac36572f2a9b295c6/docs/extend/plugin_api.md#plugin-discovery

tools/generate_config_file_samples.sh

@@ -0,0 +1,54 @@
+#!/bin/sh
+#
+# 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.
+
+set -e
+
+GEN_CMD=oslo-config-generator
+SCRIPT_PATH=$(dirname "$(readlink -f "$0")")
+DIST_PATH=$(dirname "$SCRIPT_PATH")
+
+prerequisites() (
+    if ! command -v "$GEN_CMD" > /dev/null; then
+        echo "ERROR: $GEN_CMD not installed on the system."
+        return 1
+    fi
+
+    if ! [ -f "${DIST_PATH}/kuryr_libnetwork.egg-info/entry_points.txt" ]; then
+        curr_dir=$(pwd)
+        cd "${DIST_PATH}"
+        python setup.py egg_info  # Generate entrypoints for config generation
+        cd "${curr_dir}"
+    fi
+
+    return 0
+)
+
+generate() (
+    curr_dir=$(pwd)
+    cd "${DIST_PATH}"
+    # Set PYTHONPATH so that it will use the generated egg-info
+    PYTHONPATH=. find "etc/oslo-config-generator" -type f -exec "$GEN_CMD" --config-file="{}" \;
+    cd "${curr_dir}"
+)
+
+
+prerequisites
+rc=$?
+if [ $rc -ne 0 ]; then
+    exit $rc
+fi
+
+generate
+
+set -x