Create script to build tar artifact

Script to download logstash oss and install
latest opensearch plugin from rubygems.org

Signed-off-by: Vijayan Balasubramanian <balasvij@amazon.com>

Author: VijayanB

release/tar/generate-artifact.sh

@@ -0,0 +1,105 @@
+#!/bin/bash
+
+# Copyright OpenSearch Contributors
+# SPDX-License-Identifier: Apache-2.0
+
+# This is intended to be run the plugin's root directory. `release/tar`
+set -e
+
+function usage() {
+    echo ""
+    echo "This script is used to generate the Logstash OSS tar artifact by installing logstash output opensearch plugin."
+    echo "--------------------------------------------------------------------------"
+    echo "Usage: $0 [args]"
+    echo ""
+    echo "Required arguments:"
+    echo -e "-v VERSION           \tSpecify the Logstash OSS version number that you are installing latest output plugin, e.g. '7.14.2'."
+    echo -e "-p PLATFORM          \tSpecify the platform type you are building against, e.g. 'linux, macos'."
+    echo -e "-a ARCHITECTURE      \tSpecify the architecture type you are building against, e.g. 'x64, arm64'."
+    echo -e "-t TARGET DIRECTORY  \tSpecify the location where you like to generate artifact."
+    echo -e "-h                   \tPrint this message."
+    echo ""
+    echo "--------------------------------------------------------------------------"
+}
+
+while getopts ":hv:a:t:p:" arg; do
+    case $arg in
+        h)
+            usage
+            exit 1
+            ;;
+        v)
+            VERSION=$OPTARG
+            ;;
+        p)
+            PLATFORM=$OPTARG
+            ;;
+        a)
+            ARCHITECTURE=$OPTARG
+            ;;
+        t)
+            TARGET_DIRECTORY=$OPTARG
+            ;;
+        :)
+            echo "-${OPTARG} requires an argument"
+            usage
+            exit 1
+            ;;
+        ?)
+            echo "Invalid option: -${arg}"
+            exit 1
+            ;;
+    esac
+done
+
+# Validate the required parameters to present
+if [ -z "$VERSION" ] || [ -z "$PLATFORM" ] || [ -z "$ARCHITECTURE" ] || [ -z "$TARGET_DIRECTORY" ]; then
+  echo "You must specify '-v VERSION', '-p PLATFORM', '-a ARCHITECTURE', '-t TARGET_DIRECTORY'"
+  usage
+  exit 1
+fi
+if [ "$ARCHITECTURE" != "x64" ] && [ "$ARCHITECTURE" != "arm64" ]; then
+	echo "We only support 'x64' and 'arm64' as architecture name for -a parameter"
+  exit 1
+fi
+if [ "$PLATFORM" != "macos" ] && [ "$PLATFORM" != "linux" ]; then
+	echo "We only support 'macos' and 'linux' as platform name for -p parameter"
+  exit 1
+fi
+if [ "$PLATFORM" == "macos" ] && [ "$ARCHITECTURE" == "arm64" ]; then
+	echo "We don't support $ARCHITECTURE for $PLATFORM at this moment"
+  exit 1
+fi
+
+# map user input to logstash oss for architecture
+
+if [ "$ARCHITECTURE" == "x64" ]; then
+  LOGSTASH_OSS_ARCHITECTURE="x86_64"
+elif [ "$ARCHITECTURE" == "arm64" ]; then
+  LOGSTASH_OSS_ARCHITECTURE="aarch64"
+fi
+
+# map user input to logstash oss for platform
+
+if [ "$PLATFORM" == "macos" ]; then
+  LOGSTASH_OSS_PLATFORM="darwin"
+elif [ "$PLATFORM" == "linux" ]; then
+  LOGSTASH_OSS_PLATFORM=$PLATFORM
+fi
+
+LOGSTASH_OSS_ARTIFACT_NAME=logstash-oss-$VERSION-$LOGSTASH_OSS_PLATFORM-$LOGSTASH_OSS_ARCHITECTURE.tar.gz
+GENERATED_ARTIFACT_NAME=logstash-oss-with-opensearch-output-plugin-$VERSION-$PLATFORM-$ARCHITECTURE.tar.gz
+
+echo 'downloading logstash oss'
+wget https://artifacts.elastic.co/downloads/logstash/$LOGSTASH_OSS_ARTIFACT_NAME -P $TARGET_DIRECTORY/;
+cd $TARGET_DIRECTORY;
+tar xzf $LOGSTASH_OSS_ARTIFACT_NAME;
+
+echo 'installing latest opensearch output plugin'
+logstash-$VERSION/bin/logstash-plugin install logstash-output-opensearch;
+
+echo 'bundling logstash oss with latest opensearch output plugin'
+tar -czf  $GENERATED_ARTIFACT_NAME logstash-$VERSION;
+
+echo 'Artifact path:'$TARGET_DIRECTORY/$GENERATED_ARTIFACT_NAME;
+