Git config native-image support (helidon-io#2400)

Git config native-image support

Signed-off-by: David Kral <david.k.kral@oracle.com>

Author: Verdent

common/common/src/main/java/io/helidon/common/FeatureCatalog.java

@@ -304,11 +304,9 @@ final class FeatureCatalog {
                     .path("Config", "etcd")
                     .nativeSupported(false));
         add("io.helidon.config.git",
-            FeatureDescriptor.builder()
-                    .name("git")
-                    .description("Config source based on a git repository")
-                    .path("Config", "git")
-                    .nativeSupported(false));
+            "git",
+            "Config source based on a git repository",
+            "Config", "git");
         add("io.helidon.config.hocon",
             "HOCON",
             "HOCON media type support for config",

config/git/src/main/resources/META-INF/helidon/native-image/reflection-config.json

@@ -0,0 +1,17 @@
+{
+    "annotated":[
+    ],
+    "class-hierarchy": [
+        "org.eclipse.jgit.nls.TranslationBundle"
+    ],
+    "classes": [
+        "org.eclipse.jgit.lib.CoreConfig$HideDotFiles",
+        "org.eclipse.jgit.lib.CoreConfig$AutoCRLF",
+        "org.eclipse.jgit.lib.CoreConfig$EolStreamType",
+        "org.eclipse.jgit.lib.CoreConfig$CheckStat",
+        "org.eclipse.jgit.lib.CoreConfig$SymLinks",
+        "org.eclipse.jgit.lib.CoreConfig$EOL"
+    ],
+    "exclude": [
+    ]
+}

config/git/src/main/resources/META-INF/native-image/io.helidon.config/helidon-config-git/native-image.properties

@@ -0,0 +1,17 @@
+#
+# Copyright (c) 2020 Oracle and/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.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License 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.
+#
+
+Args=--initialize-at-build-time=org.slf4j -H:EnableURLProtocols=https

config/git/src/main/resources/META-INF/native-image/io.helidon.config/helidon-config-git/reflect-config.json

@@ -0,0 +1,6 @@
+[
+    {
+        "name": "org.eclipse.jgit.internal.JGitText",
+        "allPublicConstructors": true
+    }
+]

config/git/src/main/resources/META-INF/native-image/io.helidon.config/helidon-config-git/resource-config.json

@@ -0,0 +1,7 @@
+{
+    "bundles": [
+        {
+            "name": "org.eclipse.jgit.internal.JGitText"
+        }
+    ]
+}

docs/se/aot/01_introduction.adoc

@@ -50,7 +50,7 @@ for native image.
 |✅ |{nbsp} |Object Mapping |{nbsp}
 |✅ |{nbsp} |YAML |{nbsp}
 |❓ |{nbsp} |etcd |Not yet tested.
-|❓ |{nbsp} |git |Not yet tested.
+|✅ |{nbsp} |git |{nbsp}
 |✅ |Db Client |Db Client |{nbsp}
 |✅ |{nbsp} |Health Check |{nbsp}
 |🔶 |{nbsp} |JDBC |Tested with Helidon modules for Oracle and H2 driver (see examples)

examples/config/git/pom.xml

@@ -51,6 +51,10 @@
             <groupId>io.helidon.config</groupId>
             <artifactId>helidon-config-git</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-jdk14</artifactId>
+        </dependency>
     </dependencies>
 
     <build>

examples/config/git/src/main/java/io/helidon/config/examples/git/Main.java

@@ -63,13 +63,15 @@ public static void main(String... args) throws IOException {
         // in this example we just set envvar in maven plugin 'exec', but can be set in k8s pod via ConfigMap
         Config env = Config.create(ConfigSources.environmentVariables());
 
-        System.out.println("Loading from branch " + env.get(ENVIRONMENT_NAME_PROPERTY).asString().orElse("null"));
+        String branch = env.get(ENVIRONMENT_NAME_PROPERTY).asString().orElse("master");
+
+        System.out.println("Loading from branch " + branch);
 
         Config config = Config.create(
                 GitConfigSource.builder()
                         .path("application.conf")
                         .uri(URI.create("https://github.com/helidonrobot/test-config.git"))
-                        .branch(env.get(ENVIRONMENT_NAME_PROPERTY).asString().orElse("master"))
+                        .branch(branch)
                         .build());
 
         System.out.println("Greeting is " + config.get("greeting").asString().get());