[CCSDK] Make a1policymanagement react on ConfigMap updates

Updated Deployment spec to template ConfigMap files in runtime allowing
live reaction of application to config changes.
Provided Configmaps with scripts to handle monitoring configmap-provided
files.
Updated envsubst to explicitly point to downloaded version.

Issue-ID: CCSDK-2958
Signed-off-by: Konrad Bańka <k.banka@samsung.com>
Change-Id: I22e18f2838c0956f899cb9fa96d9fd862e6c6942

2 files changed, 57 insertions, 0 deletions

diff --git a/kubernetes/a1policymanagement/resources/envsubst/daemon.sh b/kubernetes/a1policymanagement/resources/envsubst/daemon.sh
new file mode 100644
index 0000000000..6d239f1ec8
--- /dev/null
+++ b/kubernetes/a1policymanagement/resources/envsubst/daemon.sh
@@ -0,0 +1,30 @@
+#!/bin/sh
+{{/*
+# Copyright © 2020 Samsung Electronics
+#
+# 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.
+*/}}
+
+terminate() {
+  echo "$(date) | INFO | Terminating child processes"
+  pids="$(jobs -p)"
+  if [ "$pids" != "" ]; then
+    kill -TERM $pids >/dev/null 2>/dev/null
+  fi
+  wait
+}
+
+trap terminate TERM
+echo "$(date) | INFO | Started monitoring /config-input/ directory"
+inotifyd /tmp/scripts/update_files /config-input/ &
+wait
diff --git a/kubernetes/a1policymanagement/resources/envsubst/update_files b/kubernetes/a1policymanagement/resources/envsubst/update_files
new file mode 100644
index 0000000000..754bb55432
--- /dev/null
+++ b/kubernetes/a1policymanagement/resources/envsubst/update_files
@@ -0,0 +1,27 @@
+#!/bin/sh
+{{/*
+# Copyright © 2020 Samsung Electronics
+#
+# 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.
+*/}}
+
+if [ "$1" == "y" ] && [ "$3" == "..data" ]; then
+  echo "$(date) | INFO | Configmap has been reloaded"
+  cd /config-input
+  for file in $(ls -1); do
+    if [ "$file" -nt "/config/$file" ]; then
+      echo "$(date) | INFO | Templating /config/$file"
+      envsubst <$file >/config/$file
+    fi
+  done
+fi