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https://issues.apache.org/jira/browse/MNG-7914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17864921#comment-17864921
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ASF GitHub Bot commented on MNG-7914:
-------------------------------------
gnodet commented on code in PR #1595:
URL: https://github.com/apache/maven/pull/1595#discussion_r1673460926
##########
maven-embedder/src/main/java/org/apache/maven/cli/props/MavenPropertiesLoader.java:
##########
@@ -0,0 +1,176 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ */
+package org.apache.maven.cli.props;
+
+import java.nio.file.NoSuchFileException;
+import java.nio.file.Path;
+import java.util.Enumeration;
+import java.util.StringTokenizer;
+import java.util.function.Function;
+
+import static org.apache.maven.cli.props.InterpolationHelper.substVars;
+
+public class MavenPropertiesLoader {
+
+ public static final String INCLUDES_PROPERTY = "${includes}"; // includes
+
+ public static final String OVERRIDE_PREFIX =
+ "maven.override."; // prefix that marks that system property
should override defaults.
+
+ public static void loadProperties(
+ java.util.Properties properties, Path path, Function<String,
String> callback, boolean escape)
+ throws Exception {
+ MavenProperties sp = new MavenProperties(false);
+ try {
+ sp.load(path);
+ } catch (NoSuchFileException ex) {
+ // ignore
+ }
+ properties.forEach(
+ (k, v) -> sp.put(k.toString(), escape ?
InterpolationHelper.escape(v.toString()) : v.toString()));
+ substitute(sp, callback, INCLUDES_PROPERTY);
+ loadIncludes(INCLUDES_PROPERTY, path, sp);
+ substitute(sp, callback);
+ sp.forEach(properties::setProperty);
+ }
+
+ public static void substitute(MavenProperties props, Function<String,
String> callback) {
+ for (Enumeration<?> e = props.propertyNames(); e.hasMoreElements(); ) {
+ String name = (String) e.nextElement();
+ String value = props.getProperty(name);
+ if (value == null) {
+ value = callback.apply(name);
+ }
+ if (name.startsWith(OVERRIDE_PREFIX)) {
+ String overrideName = name.substring(OVERRIDE_PREFIX.length());
+ props.put(overrideName, substVars(value, name, null, props,
callback));
+ } else {
+ props.put(name, substVars(value, name, null, props, callback));
+ }
+ }
+ props.keySet().removeIf(k -> k.startsWith(OVERRIDE_PREFIX));
+ }
+
+ private static void substitute(MavenProperties props, Function<String,
String> callback, String name) {
+ String value = props.getProperty(name);
+ if (value == null) {
+ value = callback.apply(name);
+ }
+ if (value != null) {
+ props.put(name, substVars(value, name, null, props, callback));
+ }
+ }
+
+ private static MavenProperties loadPropertiesFile(Path path, boolean
failIfNotFound) throws Exception {
+ MavenProperties configProps = new MavenProperties(null, false);
+ try {
+ configProps.load(path);
+ } catch (NoSuchFileException ex) {
+ if (failIfNotFound) {
+ throw ex;
+ }
Review Comment:
Fixed
> Provide a single entry point for configuration
> ----------------------------------------------
>
> Key: MNG-7914
> URL: https://issues.apache.org/jira/browse/MNG-7914
> Project: Maven
> Issue Type: New Feature
> Reporter: Guillaume Nodet
> Priority: Major
> Fix For: 4.0.x-candidate
>
>
> Looking at MNG-7772, this should not require any code change, but it's all
> about configuration.
> I propose to load / interpolate the following files:
> * {{${maven.home}/conf/maven.user.properties}}
> * {{${maven.home}/conf/maven.system.properties}}
> Those files would be used to load additional user properties and system
> properties for Maven. In addition to the simple interpolation mechanism, we
> should provide two enhancements using special keys {{{}$\{includes{}}}} and
> {{{}$\{optionals{}}}} which would be used to load additional referenced
> configuration files such as:
> {{ ${optionals} = ${user.home}/.m2/maven.user.properties,
> ${session.rootDirectory}/.mvn/maven.user.properties}}
> Being loaded early when Maven is loaded, those files could reference
> directories to load extensions from:
> {{{}maven.core.extensions.directories =
> ${session.rootDirectory}/.mvn/extensions.xml,{}}}{{{}${user.home}/.m2/extensions.xml,${maven.home}/extensions.xml{}}}
>
> In various places, the maven code could be simplified and offer more
> configuration points at the same time.
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