add version.gradle.kts (#1122)

Issue #, if available:

Description of changes:
(copied from #1121)
The current version for ADOT SDK and Lambda Layer releases is only
provided manually in the release workflow and auto-generated by the
nebula release plugin based on previous tags, but never specified in the
code. Adding a version file will provide explicit version management and
make it easier to track upcoming releases. adotVersion is currently set
to 2.11.1-dev0, following the convention used by our other ADOT projects
([Python](https://github.com/aws-observability/aws-otel-python-instrumentation/blob/main/aws-opentelemetry-distro/src/amazon/opentelemetry/distro/version.py),
[.NET](https://github.com/aws-observability/aws-otel-dotnet-instrumentation/blob/main/src/AWS.Distro.OpenTelemetry.AutoInstrumentation/Version.cs),
[NodeJS](https://github.com/aws-observability/aws-otel-js-instrumentation/blob/629faf5d1608e6fd803f9b2c2e15d8c26ff7b40a/package.json#L3)).

The ADOT Lambda layer was previously given a version name after the
upstream OpenTelemetry instrumentation. For example, for the most recent
2.11.1 release -- which still depends on OpenTelemetry Java
Instrumentation 2.11.0 -- logs the following upon startup:
```
INFO io.opentelemetry.javaagent.tooling.VersionLogger - opentelemetry-javaagent - version: 2.11.0-adot-lambda1-aws
```
This change has the Lambda layer's Otel agent consume the version
provided in version.gradle.kts. For example, after building locally, the
layer will now log:
```
INFO io.opentelemetry.javaagent.tooling.VersionLogger - opentelemetry-javaagent - version: 2.11.1-dev0-adot-lambda1-aws
```
which is the accurate version.

Soon we will add pre-release and post-release workflows like the other
language ADOT repos to automatically bump the version number. This is
part of our work to align the release process for all 4 languages and
streamline releases for future engineers.

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Author: ezhang6811

build.gradle.kts

@@ -37,6 +37,8 @@ nebulaRelease {
   addReleaseBranchPattern("""v\d+\.\d+\.x""")
 }
 
+apply(from = "version.gradle.kts")
+
 nexusPublishing {
   repositories {
     sonatype {
@@ -71,7 +73,7 @@ allprojects {
       ktlint("1.4.0").editorConfigOverride(mapOf("indent_size" to "2", "continuation_indent_size" to "2"))
 
       // Doesn't support pluginManagement block
-      targetExclude("settings.gradle.kts")
+      targetExclude("settings.gradle.kts", "version.gradle.kts")
 
       if (!project.path.startsWith(":sample-apps:")) {
         licenseHeaderFile("${rootProject.projectDir}/config/license/header.java", "plugins|include|import")

lambda-layer/build-layer.sh

@@ -4,13 +4,20 @@ set -e
 SOURCEDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
 
 
+## Get ADOT version
+echo "Info: Getting ADOT Version"
+pushd "$SOURCEDIR"/..
+version=$(./gradlew -q printVersion)
+echo "Found ADOT Version: ${version}"
+popd
+
 ## Get OTel version
 echo "Info: Getting OTEL Version"
 file="$SOURCEDIR/../.github/patches/versions"
-version=$(awk -F'=v' '/OTEL_JAVA_INSTRUMENTATION_VERSION/ {print $2}' "$file")
-echo "Found OTEL Version: ${version}"
+otel_instrumentation_version=$(awk -F'=v' '/OTEL_JAVA_INSTRUMENTATION_VERSION/ {print $2}' "$file")
+echo "Found OTEL Version: ${otel_instrumentation_version}"
 # Exit if the version is empty or null
-if [[ -z "$version" ]]; then
+if [[ -z "$otel_instrumentation_version" ]]; then
   echo "Error: Version could not be found in ${file}."
   exit 1
 fi
@@ -20,7 +27,7 @@ fi
 echo "Info: Cloning and Patching OpenTelemetry Java Instrumentation Repository"
 git clone https://github.com/open-telemetry/opentelemetry-java-instrumentation.git
 pushd opentelemetry-java-instrumentation
-git checkout v${version} -b tag-v${version}
+git checkout v${otel_instrumentation_version} -b tag-v${otel_instrumentation_version}
 
 # This patch is for Lambda related context propagation
 patch -p1 < "$SOURCEDIR"/patches/opentelemetry-java-instrumentation.patch
@@ -56,7 +63,7 @@ popd
 
 ## Build ADOT Lambda Java SDK Layer Code
 echo "Info: Building ADOT Lambda Java SDK Layer Code"
-./gradlew build -PotelVersion=${version}
+./gradlew build -PotelVersion=${otel_instrumentation_version} -Pversion=${version}
 
 
 ## Copy ADOT Java Agent downloaded using Gradle task and bundle it with the Lambda handler script

lambda-layer/build.gradle.kts

@@ -27,6 +27,7 @@ val javaagentDependency by configurations.creating {
   extendsFrom()
 }
 
+val version: String by project
 val otelVersion: String by project
 
 dependencies {
@@ -35,7 +36,7 @@ dependencies {
   // Already included in wrapper so compileOnly
   compileOnly("io.opentelemetry:opentelemetry-sdk-extension-autoconfigure-spi")
   compileOnly("io.opentelemetry:opentelemetry-sdk-extension-aws")
-  javaagentDependency("software.amazon.opentelemetry:aws-opentelemetry-agent:$otelVersion-adot-lambda1")
+  javaagentDependency("software.amazon.opentelemetry:aws-opentelemetry-agent:$version-adot-lambda1")
 }
 
 tasks.register<Copy>("download") {

version.gradle.kts

@@ -0,0 +1,24 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file 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.
+ */
+
+val adotVersion = "2.18.0-dev0"
+
+allprojects {
+  version = if (project.hasProperty("release.version")) {
+    project.property("release.version") as String
+  } else {
+    adotVersion
+  }
+}