From f01b48d89ddf096faa32819ca1706762dc10bf95 Mon Sep 17 00:00:00 2001
From: daz <daz@gradle.com>
Date: Fri, 7 Jul 2023 16:22:07 -0600
Subject: [PATCH] Do not attempt dependency graph on unsupported Gradle
 versions

---
 .../github-dependency-graph.init.gradle       |  9 +++++++-
 .../TestDependencyGraph.groovy                | 23 ++++++++++++++++---
 2 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/src/resources/init-scripts/github-dependency-graph.init.gradle b/src/resources/init-scripts/github-dependency-graph.init.gradle
index ec0c653..6d7eced 100644
--- a/src/resources/init-scripts/github-dependency-graph.init.gradle
+++ b/src/resources/init-scripts/github-dependency-graph.init.gradle
@@ -1,13 +1,20 @@
+import org.gradle.util.GradleVersion
+
 if (System.env.GITHUB_DEPENDENCY_GRAPH_ENABLED != "true") {
   return
 }
 
+if (GradleVersion.current().baseVersion < GradleVersion.version("5.0")) {
+  println "::warning::Dependency Graph is not supported for Gradle versions < 5.0. No dependency snapshot will be generated."
+  return
+}
+
 def reportDir = System.env.GITHUB_DEPENDENCY_GRAPH_REPORT_DIR
 def jobCorrelator = System.env.GITHUB_DEPENDENCY_GRAPH_JOB_CORRELATOR
 def reportFile = new File(reportDir, jobCorrelator + ".json")
 
 if (reportFile.exists()) {
-  println "::warning::No dependency report generated for step: report file for '${jobCorrelator}' created in earlier step. Each build invocation requires a unique job correlator: specify GITHUB_DEPENDENCY_GRAPH_JOB_CORRELATOR var for this step."
+  println "::warning::No dependency snapshot generated for step: report file for '${jobCorrelator}' created in earlier step. Each build invocation requires a unique job correlator: specify GITHUB_DEPENDENCY_GRAPH_JOB_CORRELATOR var for this step."
   return
 }
 
diff --git a/test/init-scripts/src/test/groovy/com/gradle/gradlebuildaction/TestDependencyGraph.groovy b/test/init-scripts/src/test/groovy/com/gradle/gradlebuildaction/TestDependencyGraph.groovy
index 893e93a..4047c1b 100644
--- a/test/init-scripts/src/test/groovy/com/gradle/gradlebuildaction/TestDependencyGraph.groovy
+++ b/test/init-scripts/src/test/groovy/com/gradle/gradlebuildaction/TestDependencyGraph.groovy
@@ -5,6 +5,9 @@ import static org.junit.Assume.assumeTrue
 class TestDependencyGraph extends BaseInitScriptTest {
     def initScript = 'github-dependency-graph.init.gradle'
 
+    static final List<TestGradleVersion> NO_DEPENDENCY_GRAPH_VERSIONS = [GRADLE_3_X, GRADLE_4_X]
+    static final List<TestGradleVersion> DEPENDENCY_GRAPH_VERSIONS = ALL_VERSIONS - NO_DEPENDENCY_GRAPH_VERSIONS
+
 
     def "does not produce dependency graph when not enabled"() {
         assumeTrue testGradleVersion.compatibleWithCurrentJvm
@@ -29,7 +32,21 @@ class TestDependencyGraph extends BaseInitScriptTest {
         assert reportFile.exists()
 
         where:
-        testGradleVersion << ALL_VERSIONS
+        testGradleVersion << DEPENDENCY_GRAPH_VERSIONS
+    }
+
+    def "warns and produces no dependency graph when enabled for older Gradle versions"() {
+        assumeTrue testGradleVersion.compatibleWithCurrentJvm
+
+        when:
+        def result = run(['help'], initScript, testGradleVersion.gradleVersion, [], envVars)
+
+        then:
+        assert !reportsDir.exists()
+        assert result.output.contains("::warning::Dependency Graph is not supported")
+
+        where:
+        testGradleVersion << NO_DEPENDENCY_GRAPH_VERSIONS
     }
 
     def "warns and does not overwrite existing report file"() {
@@ -42,10 +59,10 @@ class TestDependencyGraph extends BaseInitScriptTest {
 
         then:
         assert reportFile.text == "DUMMY CONTENT"
-        assert result.output.contains("::warning::No dependency report generated for step")
+        assert result.output.contains("::warning::No dependency snapshot generated for step")
 
         where:
-        testGradleVersion << ALL_VERSIONS
+        testGradleVersion << DEPENDENCY_GRAPH_VERSIONS
     }
 
     def getEnvVars() {