[ 
https://issues.apache.org/jira/browse/MNG-7914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17874547#comment-17874547
 ] 

ASF GitHub Bot commented on MNG-7914:
-------------------------------------

gnodet commented on code in PR #1595:
URL: https://github.com/apache/maven/pull/1595#discussion_r1720811081


##########
maven-embedder/src/main/java/org/apache/maven/cli/MavenCli.java:
##########
@@ -1624,20 +1643,65 @@ static void populateProperties(
         String mavenBuildVersion = 
CLIReportingUtils.createMavenVersionString(buildProperties);
         systemProperties.setProperty("maven.build.version", mavenBuildVersion);
 
-        BasicInterpolator interpolator =
-                createInterpolator(paths, systemProperties, userProperties, 
userSpecifiedProperties);
-        for (Map.Entry<Object, Object> e : userSpecifiedProperties.entrySet()) 
{
-            String name = (String) e.getKey();
-            String value = interpolator.interpolate((String) e.getValue());
-            userProperties.setProperty(name, value);
-            // 
----------------------------------------------------------------------
-            // I'm leaving the setting of system properties here as not to 
break
-            // the SystemPropertyProfileActivator. This won't harm embedding. 
jvz.
-            // 
----------------------------------------------------------------------
-            if (System.getProperty(name) == null) {
-                System.setProperty(name, value);
-            }
+        // 
----------------------------------------------------------------------
+        // Options that are set on the command line become system properties
+        // and therefore are set in the session properties. System properties
+        // are most dominant.
+        // 
----------------------------------------------------------------------
+
+        Properties userSpecifiedProperties =
+                
commandLine.getOptionProperties(String.valueOf(CLIManager.SET_USER_PROPERTY));
+        userProperties.putAll(userSpecifiedProperties);
+
+        // 
----------------------------------------------------------------------
+        // Load config files
+        // 
----------------------------------------------------------------------
+        Function<String, String> callback =
+                or(paths::getProperty, prefix("cli.", 
commandLine::getOptionValue), systemProperties::getProperty);
+
+        Path mavenConf;
+        if (systemProperties.getProperty(MAVEN_INSTALLATION_CONF) != null) {
+            mavenConf = 
fileSystem.getPath(systemProperties.getProperty(MAVEN_INSTALLATION_CONF));
+        } else if (systemProperties.getProperty("maven.conf") != null) {
+            mavenConf = 
fileSystem.getPath(systemProperties.getProperty("maven.conf"));
+        } else if (systemProperties.getProperty(MAVEN_HOME) != null) {
+            mavenConf = 
fileSystem.getPath(systemProperties.getProperty(MAVEN_HOME), "conf");
+        } else {
+            mavenConf = fileSystem.getPath("");
         }
+        Path propertiesFile = mavenConf.resolve("maven.properties");
+        MavenPropertiesLoader.loadProperties(userProperties, propertiesFile, 
callback, false);
+
+        // 
----------------------------------------------------------------------
+        // I'm leaving the setting of system properties here as not to break
+        // the SystemPropertyProfileActivator. This won't harm embedding. jvz.
+        // 
----------------------------------------------------------------------
+        Set<String> sys = 
SystemProperties.getSystemProperties().stringPropertyNames();
+        userProperties.stringPropertyNames().stream()
+                .filter(k -> !sys.contains(k))
+                .forEach(k -> System.setProperty(k, 
userProperties.getProperty(k)));
+    }

Review Comment:
   I've raised https://github.com/apache/maven/pull/1661 to assess if there are 
any failing ITs as a first step.





> 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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