Check if configured DV plugin version is unsupported (#35)

Also updates the release process to expect a version without 'v' prefix.

Fixes #27 
Fixes #34

.github/workflows/gradle-release.yml

@@ -4,7 +4,7 @@ on:
   workflow_dispatch:
     inputs:
       version:
-        description: "Version with leading 'v' (eg v1.1.0)"
+        description: "Version without 'v' (eg '1.1' or '1.1.1')"
         type: string
         required: true
 
@@ -45,8 +45,8 @@ jobs:
           commit_author: bot-githubaction <bot-githubaction@gradle.com>
           commit_user_name: bot-githubaction
           commit_user_email: bot-githubaction@gradle.com
-          commit_message: '[bot] Promote init-script as ${{ inputs.version }}'
-          tagging_message: '${{ inputs.version }}'
+          commit_message: '[bot] Promote init-script as v${{ inputs.version }}'
+          tagging_message: 'v${{ inputs.version }}'
 
   update-gradle-actions:
     needs: [update-reference]

.github/workflows/gradle-send-update-pr.yml

@@ -67,12 +67,12 @@ jobs:
           token: ${{ secrets.GH_BOT_GITHUB_TOKEN }}
           branch: bot/develocity-injection-init-script-update
           delete-branch: true
-          title: 'Update develocity-injection init script to ${{ inputs.version }}'
+          title: 'Update develocity-injection init script to v${{ inputs.version }}'
           body: |
             Updates the develocity-injection init script to the latest reference script content
             from https://github.com/gradle/develocity-ci-injection.
           commit-message: | 
-            Update develocity-injection init script to ${{ inputs.version }}
+            Update develocity-injection init script to v${{ inputs.version }}
 
             Updates the develocity-injection init script to the latest reference script content
             from https://github.com/gradle/develocity-ci-injection.

src/main/resources/develocity-injection.init.gradle

@@ -153,6 +153,12 @@ void enableDevelocityInjection() {
         logger.lifecycle("Accepting Gradle Terms of Use: $buildScanTermsOfUseUrl")
     }
 
+    // finish early if DV plugin version is unsupported (v3.6.4 is the minimum version tested and supports back to DV 2021.1)
+    if (develocityPluginVersion && isNotAtLeast(develocityPluginVersion, '3.6.4')) {
+        logger.warn("Develocity Gradle plugin must be at least 3.6.4. Configured version is $develocityPluginVersion.")
+        return
+    }
+
     // finish early if configuration parameters passed in via system properties are not valid/supported
     if (ccudPluginVersion && isNotAtLeast(ccudPluginVersion, '1.7')) {
         logger.warn("Common Custom User Data Gradle plugin must be at least 1.7. Configured version is $ccudPluginVersion.")

src/test/groovy/com/gradle/TestDevelocityInjection.groovy

@@ -315,6 +315,21 @@ class TestDevelocityInjection extends BaseInitScriptTest {
         testGradle << ALL_GRADLE_VERSIONS
     }
 
+    @Requires({data.testGradle.compatibleWithCurrentJvm})
+    def "stops gracefully when requested DV plugin version is < 3.6.4"() {
+        when:
+        def config = testConfig('3.6.3')
+        def result = run(testGradle, config)
+
+        then:
+        outputMissesDevelocityPluginApplicationViaInitScript(result)
+        outputMissesCcudPluginApplicationViaInitScript(result)
+        result.output.contains('Develocity Gradle plugin must be at least 3.6.4. Configured version is 3.6.3.')
+
+        where:
+        testGradle << ALL_GRADLE_VERSIONS
+    }
+
     @Requires({data.testGradle.compatibleWithCurrentJvm})
     def "can configure Develocity via CCUD system property overrides when plugins are injected via init script"() {
         when: