Allow Graal location to be set via system property

Author: stuartwdouglas

examples/permissive/pom.xml

@@ -120,6 +120,7 @@
                                 </goals>
                                 <configuration>
                                     <reportErrorsAtRuntime>true</reportErrorsAtRuntime>
+                                    <graalvmHome>${graalvmHome}</graalvmHome>
                                 </configuration>
                             </execution>
                         </executions>

examples/strict/pom.xml

@@ -168,6 +168,7 @@
                                 <configuration>
                                     <cleanupServer>true</cleanupServer>
                                     <enableHttpUrlHandler>true</enableHttpUrlHandler>
+                                    <graalvmHome>${graalvmHome}</graalvmHome>
                                 </configuration>
                             </execution>
                         </executions>

maven/src/main/java/org/jboss/shamrock/maven/NativeImageMojo.java

@@ -3,6 +3,7 @@
 import java.io.File;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.List;
 
 import org.apache.maven.plugin.AbstractMojo;
@@ -47,20 +48,24 @@ public class NativeImageMojo extends AbstractMojo {
     @Parameter
     private boolean enableHttpUrlHandler;
 
+    @Parameter(defaultValue = "${env.GRAALVM_HOME}")
+    private String graalvmHome;
+
     @Override
     public void execute() throws MojoExecutionException, MojoFailureException {
 
+        HashMap<String, String> env = new HashMap<>(System.getenv());
         List<String> nativeImage;
         String graalvmCmd = System.getenv("GRAALVM_NATIVE_IMAGE_CMD");
         if (graalvmCmd != null) {
             // E.g. "/usr/bin/docker run -v {{PROJECT_DIR}}:/project --rm protean/graalvm-native-image"
             nativeImage = new ArrayList<>();
             Collections.addAll(nativeImage, graalvmCmd.replace("{{PROJECT_DIR}}", outputDirectory.getAbsolutePath()).split(" "));
         } else {
-            String graalvmHome = System.getenv("GRAALVM_HOME");
             if (graalvmHome == null) {
                 throw new MojoFailureException("GRAALVM_HOME was not set");
             }
+            env.put("GRAALVM_HOME", graalvmHome);
             nativeImage = Collections.singletonList(graalvmHome + File.separator + "bin" + File.separator + "native-image");
         }
 

pom.xml

@@ -57,6 +57,9 @@
         <javax.persistence-api.version>2.2</javax.persistence-api.version>
         <rxjava.version>2.1.12</rxjava.version>
         <microprofile-rest-client-api.version>1.0</microprofile-rest-client-api.version>
+
+
+        <graalvmHome>${env.GRAALVM_HOME}</graalvmHome>
     </properties>
 
     <modules>