Adding the from.platforms Jib config parameter to jib-maven-plugin and to the jib-gradle-plugin

jib-maven-plugin/src/main/java/com/google/cloud/tools/jib/maven/JibPluginConfiguration.java

@@ -127,6 +127,22 @@ Optional<String> getMode() {
     }
   }
 
+  /** Configuration for {@code platform} parameter. * */
+  public static class PlatformsConfiguration {
+    @Nullable @Parameter private String os;
+    @Nullable @Parameter private String architecture;
+
+    @Nullable
+    String getOs() {
+      return this.os;
+    }
+
+    @Nullable
+    String getArchitecture() {
+      return this.architecture;
+    }
+  }
+
   /** Configuration for {@code from} parameter. */
   public static class FromConfiguration {
 
@@ -135,6 +151,16 @@ public static class FromConfiguration {
     @Nullable @Parameter private String credHelper;
 
     @Parameter private FromAuthConfiguration auth = new FromAuthConfiguration();
+
+    @Parameter private List<PlatformsConfiguration> platforms;
+
+    /** Constructor for defaults . * */
+    public FromConfiguration() {
+      PlatformsConfiguration platform = new PlatformsConfiguration();
+      platform.os = "linux";
+      platform.architecture = "amd64";
+      platforms = Collections.singletonList(platform);
+    }
   }
 
   /** Configuration for {@code to} parameter, where image is required. */
@@ -330,6 +356,15 @@ protected void checkJibVersion() throws MojoExecutionException {
     MojoCommon.checkJibVersion(descriptor);
   }
 
+  /**
+   * Gets the specified platforms.
+   *
+   * @return the specified platforms
+   */
+  List<PlatformsConfiguration> getPlatforms() {
+    return from.platforms;
+  }
+
   /**
    * Gets the base image reference.
    *

jib-maven-plugin/src/test/java/com/google/cloud/tools/jib/maven/JibPluginConfigurationTest.java

@@ -69,6 +69,8 @@ public Log getLog() {
 
   @Test
   public void testDefaults() {
+    Assert.assertEquals("linux", testPluginConfiguration.getPlatforms().get(0).getOs());
+    Assert.assertEquals("amd64", testPluginConfiguration.getPlatforms().get(0).getArchitecture());
     Assert.assertEquals("", testPluginConfiguration.getAppRoot());
     Assert.assertNull(testPluginConfiguration.getWorkingDirectory());
     Assert.assertTrue(testPluginConfiguration.getExtraClasspath().isEmpty());