From 5c0b36da02f72abb15c52042bf5817ff5e7ec24d Mon Sep 17 00:00:00 2001
From: Kohsuke Kawaguchi <kk@kohsuke.org>
Date: Tue, 3 Jan 2012 20:44:16 -0800
Subject: [PATCH] made the location of Maven local repositories pluggable

---
 changelog.html                                |  3 +
 .../main/java/hudson/maven/MavenBuild.java    |  7 +-
 .../java/hudson/maven/MavenModuleSet.java     | 78 +++++++++++++++++--
 .../hudson/maven/MavenModuleSetBuild.java     | 19 +++--
 .../src/main/java/hudson/maven/MavenUtil.java |  6 +-
 .../DefaultLocalRepositoryLocator.java        | 30 +++++++
 .../local_repo/LocalRepositoryLocator.java    | 29 +++++++
 .../LocalRepositoryLocatorDescriptor.java     | 11 +++
 .../PerExecutorLocalRepositoryLocator.java    | 28 +++++++
 .../PerJobLocalRepositoryLocator.java         | 30 +++++++
 .../MavenModuleSet/configure-entries.jelly    |  4 +-
 .../hudson/maven/MavenModuleSet/global.jelly  |  1 +
 .../MavenModuleSet/help-localRepository.html  |  5 ++
 .../LocalRepositoryLocator/config.groovy      |  3 +
 .../java/hudson/maven/MavenModuleSetTest.java | 23 ++++++
 15 files changed, 258 insertions(+), 19 deletions(-)
 create mode 100644 maven-plugin/src/main/java/hudson/maven/local_repo/DefaultLocalRepositoryLocator.java
 create mode 100644 maven-plugin/src/main/java/hudson/maven/local_repo/LocalRepositoryLocator.java
 create mode 100644 maven-plugin/src/main/java/hudson/maven/local_repo/LocalRepositoryLocatorDescriptor.java
 create mode 100644 maven-plugin/src/main/java/hudson/maven/local_repo/PerExecutorLocalRepositoryLocator.java
 create mode 100644 maven-plugin/src/main/java/hudson/maven/local_repo/PerJobLocalRepositoryLocator.java
 create mode 100644 maven-plugin/src/main/resources/hudson/maven/MavenModuleSet/help-localRepository.html
 create mode 100644 maven-plugin/src/main/resources/hudson/maven/local_repo/LocalRepositoryLocator/config.groovy
 create mode 100644 test/src/test/java/hudson/maven/MavenModuleSetTest.java

diff --git a/changelog.html b/changelog.html
index 2c1ced9feb..6cf4643eb7 100644
--- a/changelog.html
+++ b/changelog.html
@@ -80,6 +80,9 @@ Upcoming changes</a>
   <li class="rfe">
     Added the Reploy-To header support.
     (<a href="https://github.com/jenkinsci/jenkins/pull/306">pull #306</a>)
+  <li class="rfe">
+    The location of Maven local repository is now pluggable, and supported per-executor configuration out of the box.
+    (<a href="https://github.com/jenkinsci/jenkins/pull/293">pull #293</a>)
   <li class="rfe">
     Jobs now support display name separate from its unique name
     <a href="https://issues.jenkins-ci.org/browse/JENKINS-11762">issue 11762</a>
diff --git a/maven-plugin/src/main/java/hudson/maven/MavenBuild.java b/maven-plugin/src/main/java/hudson/maven/MavenBuild.java
index 2e16473094..e7d47e2c4f 100644
--- a/maven-plugin/src/main/java/hudson/maven/MavenBuild.java
+++ b/maven-plugin/src/main/java/hudson/maven/MavenBuild.java
@@ -25,6 +25,7 @@ package hudson.maven;
 
 import hudson.EnvVars;
 import hudson.FilePath;
+import hudson.maven.local_repo.LocalRepositoryLocator;
 import hudson.maven.reporters.MavenArtifactRecord;
 import hudson.maven.reporters.SurefireArchiver;
 import hudson.slaves.WorkspaceList;
@@ -687,10 +688,10 @@ public class MavenBuild extends AbstractMavenBuild<MavenModule,MavenBuild> {
                         getParent().getParent(), launcher, envVars, getMavenOpts(listener, envVars), null ));
 
             ArgumentListBuilder margs = new ArgumentListBuilder("-N","-B");
-            if(mms.usesPrivateRepository())
-                // use the per-project repository. should it be per-module? But that would cost too much in terms of disk
+            FilePath localRepo = mms.getLocalRepository().locate(MavenBuild.this);
+            if(localRepo!=null)
                 // the workspace must be on this node, so getRemote() is safe.
-                margs.add("-Dmaven.repo.local="+getWorkspace().child(".repository").getRemote());
+                margs.add("-Dmaven.repo.local="+localRepo.getRemote());
 
             if (mms.getAlternateSettings() != null) {
                 if (IOUtils.isAbsolute(mms.getAlternateSettings())) {
diff --git a/maven-plugin/src/main/java/hudson/maven/MavenModuleSet.java b/maven-plugin/src/main/java/hudson/maven/MavenModuleSet.java
index 91151adb99..95dbbdc96f 100644
--- a/maven-plugin/src/main/java/hudson/maven/MavenModuleSet.java
+++ b/maven-plugin/src/main/java/hudson/maven/MavenModuleSet.java
@@ -24,7 +24,7 @@
  */
 package hudson.maven;
 
-import static hudson.Util.fixEmpty;
+import static hudson.Util.*;
 import static hudson.model.ItemGroupMixIn.loadChildren;
 import hudson.CopyOnWrite;
 import hudson.EnvVars;
@@ -34,6 +34,9 @@ import hudson.FilePath;
 import hudson.Functions;
 import hudson.Indenter;
 import hudson.Util;
+import hudson.maven.local_repo.DefaultLocalRepositoryLocator;
+import hudson.maven.local_repo.LocalRepositoryLocator;
+import hudson.maven.local_repo.PerJobLocalRepositoryLocator;
 import hudson.maven.settings.SettingsProviderUtils;
 import hudson.model.AbstractProject;
 import hudson.model.Action;
@@ -183,8 +186,20 @@ public class MavenModuleSet extends AbstractMavenProject<MavenModuleSet,MavenMod
      * from multiple Maven process, so this helps there too.
      *
      * @since 1.223
+     * @deprecated as of 1.448
+     *      Subsumed by {@link #localRepository}. false maps to {@link DefaultLocalRepositoryLocator},
+     *      and true maps to {@link PerJobLocalRepositoryLocator}
      */
-    private boolean usePrivateRepository = false;
+    private transient Boolean usePrivateRepository;
+
+    /**
+     * Encapsulates where to run the local repository.
+     *
+     * If null, inherited from the global configuration.
+     * 
+     * @since 1.448
+     */
+    private LocalRepositoryLocator localRepository = null;
     
    /**
     * If true, the build will send a failure e-mail for each failing maven module.
@@ -440,8 +455,12 @@ public class MavenModuleSet extends AbstractMavenProject<MavenModuleSet,MavenMod
         return aggregatorStyleBuild;
     }
 
+    /**
+     * @deprecated as of 1.448
+     *      Use {@link #getLocalRepository()}
+     */
     public boolean usesPrivateRepository() {
-        return usePrivateRepository;
+        return !(getLocalRepository() instanceof DefaultLocalRepositoryLocator);
     }
 
     public boolean isPerModuleEmail() {
@@ -468,8 +487,31 @@ public class MavenModuleSet extends AbstractMavenProject<MavenModuleSet,MavenMod
         this.aggregatorStyleBuild = aggregatorStyleBuild;
     }
 
+    /**
+     * @deprecated as of 1.448.
+     *      Use {@link #setLocalRepository(LocalRepositoryLocator)} instead
+     */
     public void setUsePrivateRepository(boolean usePrivateRepository) {
-        this.usePrivateRepository = usePrivateRepository;
+        setLocalRepository(usePrivateRepository?new PerJobLocalRepositoryLocator() : new DefaultLocalRepositoryLocator());
+    }
+
+    /**
+     * @return 
+     *      never null
+     */
+    public LocalRepositoryLocator getLocalRepository() {
+        return localRepository!=null ? localRepository : getDescriptor().getLocalRepository();
+    }
+
+    /**
+     * Undefaulted locally configured value with taking inheritance from the global configuration into account.
+     */
+    public LocalRepositoryLocator getExplicitLocalRepository() {
+        return localRepository;
+    }
+
+    public void setLocalRepository(LocalRepositoryLocator localRepository) {
+        this.localRepository = localRepository;
     }
 
     public void setIgnoreUpstremChanges(boolean ignoreUpstremChanges) {
@@ -681,6 +723,11 @@ public class MavenModuleSet extends AbstractMavenProject<MavenModuleSet,MavenMod
             perModuleEmail = Boolean.TRUE;
         }
         
+        if (Boolean.TRUE.equals(usePrivateRepository)) {
+            this.localRepository = new PerJobLocalRepositoryLocator();
+            usePrivateRepository = null;
+        }
+        
         updateTransientActions();
     }
 
@@ -1002,7 +1049,10 @@ public class MavenModuleSet extends AbstractMavenProject<MavenModuleSet,MavenMod
         mavenOpts = Util.fixEmpty(req.getParameter("mavenOpts").trim());
         mavenName = req.getParameter("maven_version");
         aggregatorStyleBuild = !req.hasParameter("maven.perModuleBuild");
-        usePrivateRepository = req.hasParameter("maven.usePrivateRepository");
+        if (json.optBoolean("usePrivateRepository"))
+            localRepository = req.bindJSON(LocalRepositoryLocator.class,json.getJSONObject("explicitLocalRepository"));
+        else
+            localRepository = null;
         perModuleEmail = req.hasParameter("maven.perModuleEmail");
         ignoreUpstremChanges = !json.has("triggerByDependency");
         runHeadless = req.hasParameter("maven.runHeadless");
@@ -1085,6 +1135,11 @@ public class MavenModuleSet extends AbstractMavenProject<MavenModuleSet,MavenMod
          */
         private Map<String, Integer> mavenValidationLevels = new LinkedHashMap<String, Integer>();
 
+        /**
+         * @since 1.448
+         */
+        private LocalRepositoryLocator localRepository = new DefaultLocalRepositoryLocator();
+
         public DescriptorImpl() {
             super();
             load();
@@ -1105,6 +1160,18 @@ public class MavenModuleSet extends AbstractMavenProject<MavenModuleSet,MavenMod
             save();
         }
 
+        /**
+         * @return never null.
+         */
+        public LocalRepositoryLocator getLocalRepository() {
+            return localRepository!=null ? localRepository : new DefaultLocalRepositoryLocator();
+        }
+
+        public void setLocalRepository(LocalRepositoryLocator localRepository) {
+            this.localRepository = localRepository;
+            save();
+        }
+
         public String getDisplayName() {
             return Messages.MavenModuleSet_DiplayName();
         }
@@ -1128,6 +1195,7 @@ public class MavenModuleSet extends AbstractMavenProject<MavenModuleSet,MavenMod
         @Override
         public boolean configure( StaplerRequest req, JSONObject o ) {
             globalMavenOpts = Util.fixEmptyAndTrim(o.getString("globalMavenOpts"));
+            localRepository = req.bindJSON(LocalRepositoryLocator.class,o.getJSONObject("localRepository"));
             save();
 
             return true;
diff --git a/maven-plugin/src/main/java/hudson/maven/MavenModuleSetBuild.java b/maven-plugin/src/main/java/hudson/maven/MavenModuleSetBuild.java
index 1093ff14f5..5988574a2f 100644
--- a/maven-plugin/src/main/java/hudson/maven/MavenModuleSetBuild.java
+++ b/maven-plugin/src/main/java/hudson/maven/MavenModuleSetBuild.java
@@ -719,8 +719,9 @@ public class MavenModuleSetBuild extends AbstractMavenBuild<MavenModuleSet,Maven
                                                                                            pom.getParent() ) );
                         }
                         ArgumentListBuilder margs = new ArgumentListBuilder().add("-B").add("-f", pom.getRemote());
-                        if(project.usesPrivateRepository())
-                            margs.add("-Dmaven.repo.local="+getWorkspace().child(".repository"));
+                        FilePath localRepo = project.getLocalRepository().locate(MavenModuleSetBuild.this);
+                        if(localRepo!=null)
+                            margs.add("-Dmaven.repo.local="+localRepo.getRemote());
 
                         if (project.globalSettingConfigPath != null)
                             margs.add("-gs" , project.globalSettingConfigPath);
@@ -910,7 +911,7 @@ public class MavenModuleSetBuild extends AbstractMavenBuild<MavenModuleSet,Maven
 
             List<PomInfo> poms;
             try {
-                poms = getModuleRoot().act(new PomParser(listener, mvn, project, mavenVersion, envVars, getWorkspace()));
+                poms = getModuleRoot().act(new PomParser(listener, mvn, mavenVersion, envVars, MavenModuleSetBuild.this));
             } catch (IOException e) {
                 if (project.isIncrementalBuild()) {
                     // If POM parsing failed we should do a full build next time.
@@ -1074,8 +1075,9 @@ public class MavenModuleSetBuild extends AbstractMavenBuild<MavenModuleSet,Maven
         
         String rootPOMRelPrefix;
         
-        public PomParser(BuildListener listener, MavenInstallation mavenHome, MavenModuleSet project, String mavenVersion, EnvVars envVars, FilePath workspace) {
+        public PomParser(BuildListener listener, MavenInstallation mavenHome, String mavenVersion, EnvVars envVars, MavenModuleSetBuild build) {
             // project cannot be shipped to the remote JVM, so all the relevant properties need to be captured now.
+            MavenModuleSet project = build.getProject();
             this.listener = listener;
             this.mavenHome = mavenHome;
             this.rootPOM = project.getRootPOM();
@@ -1100,10 +1102,11 @@ public class MavenModuleSetBuild extends AbstractMavenBuild<MavenModuleSet,Maven
             
             this.nonRecursive = project.isNonRecursive();
 
-            this.workspaceProper = workspace.getRemote();
+            this.workspaceProper = build.getWorkspace().getRemote();
             LOGGER.fine("Workspace is " + workspaceProper);
-            if (project.usesPrivateRepository()) {
-                this.privateRepository = workspace.child(".repository").getRemote();
+            FilePath localRepo = project.getLocalRepository().locate(build);
+            if (localRepo!=null) {
+                this.privateRepository = localRepo.getRemote();
             } else {
                 this.privateRepository = null;
             }
@@ -1115,7 +1118,7 @@ public class MavenModuleSetBuild extends AbstractMavenBuild<MavenModuleSet,Maven
             this.processPlugins = project.isProcessPlugins();
             
             this.moduleRootPath = 
-                project.getScm().getModuleRoot( workspace, project.getLastBuild() ).getRemote();
+                project.getScm().getModuleRoot( build.getWorkspace(), project.getLastBuild() ).getRemote();
             
             this.mavenValidationLevel = project.getMavenValidationLevel();
             this.globalSetings = project.globalSettingConfigPath;
diff --git a/maven-plugin/src/main/java/hudson/maven/MavenUtil.java b/maven-plugin/src/main/java/hudson/maven/MavenUtil.java
index 1760d6fe8e..a0dda1f520 100755
--- a/maven-plugin/src/main/java/hudson/maven/MavenUtil.java
+++ b/maven-plugin/src/main/java/hudson/maven/MavenUtil.java
@@ -24,6 +24,7 @@
 package hudson.maven;
 
 import hudson.AbortException;
+import hudson.FilePath;
 import hudson.Util;
 import hudson.model.AbstractBuild;
 import hudson.model.AbstractProject;
@@ -102,8 +103,9 @@ public class MavenUtil {
             settingsLoc = (altSet == null) ? null 
                 : new File(build.getWorkspace().child(altSet).getRemote());
 
-            if (((MavenModuleSet) project).usesPrivateRepository()) {
-                privateRepository = build.getWorkspace().child(".repository").getRemote();
+            FilePath localRepo = ((MavenModuleSet) project).getLocalRepository().locate((MavenModuleSetBuild) build);
+            if (localRepo!=null) {
+                privateRepository = localRepo.getRemote();
             }
 
             profiles = ((MavenModuleSet) project).getProfiles();
diff --git a/maven-plugin/src/main/java/hudson/maven/local_repo/DefaultLocalRepositoryLocator.java b/maven-plugin/src/main/java/hudson/maven/local_repo/DefaultLocalRepositoryLocator.java
new file mode 100644
index 0000000000..de3afa50a4
--- /dev/null
+++ b/maven-plugin/src/main/java/hudson/maven/local_repo/DefaultLocalRepositoryLocator.java
@@ -0,0 +1,30 @@
+package hudson.maven.local_repo;
+
+import hudson.Extension;
+import hudson.FilePath;
+import hudson.maven.AbstractMavenBuild;
+import org.kohsuke.stapler.DataBoundConstructor;
+
+/**
+ * Uses Maven's default local repository, which is actually <tt>~/.m2/repository</tt>
+ *
+ * @author Kohsuke Kawaguchi
+ */
+public class DefaultLocalRepositoryLocator extends LocalRepositoryLocator {
+    @DataBoundConstructor
+    public DefaultLocalRepositoryLocator() {
+    }
+
+    @Override
+    public FilePath locate(AbstractMavenBuild build) {
+        return null;
+    }
+
+    @Extension
+    public static class DescriptorImpl extends LocalRepositoryLocatorDescriptor {
+        @Override
+        public String getDisplayName() {
+            return "Default (~/.m2/repository)";
+        }
+    }
+}
diff --git a/maven-plugin/src/main/java/hudson/maven/local_repo/LocalRepositoryLocator.java b/maven-plugin/src/main/java/hudson/maven/local_repo/LocalRepositoryLocator.java
new file mode 100644
index 0000000000..660ca3bf9d
--- /dev/null
+++ b/maven-plugin/src/main/java/hudson/maven/local_repo/LocalRepositoryLocator.java
@@ -0,0 +1,29 @@
+package hudson.maven.local_repo;
+
+import hudson.ExtensionPoint;
+import hudson.FilePath;
+import hudson.maven.AbstractMavenBuild;
+import hudson.model.AbstractDescribableImpl;
+
+/**
+ * Strategy pattern that decides the location of the Maven local repository for a build.
+ *
+ * @author Kohsuke Kawaguchi
+ * @since 1.448
+ * @see LocalRepositoryLocatorDescriptor
+ */
+public abstract class LocalRepositoryLocator extends AbstractDescribableImpl<LocalRepositoryLocator> implements ExtensionPoint {
+    /**
+     * Called during the build on the master to determine the location of the local Maven repository.
+     *
+     * @return
+     *      null to let Maven uses its default location. Otherwise this must be located on the same
+     *      node as {@link AbstractMavenBuild#getWorkspace()} does.
+     */
+    public abstract FilePath locate(AbstractMavenBuild build);
+
+    @Override
+    public LocalRepositoryLocatorDescriptor getDescriptor() {
+        return (LocalRepositoryLocatorDescriptor)super.getDescriptor();
+    }
+}
diff --git a/maven-plugin/src/main/java/hudson/maven/local_repo/LocalRepositoryLocatorDescriptor.java b/maven-plugin/src/main/java/hudson/maven/local_repo/LocalRepositoryLocatorDescriptor.java
new file mode 100644
index 0000000000..a31cb5be73
--- /dev/null
+++ b/maven-plugin/src/main/java/hudson/maven/local_repo/LocalRepositoryLocatorDescriptor.java
@@ -0,0 +1,11 @@
+package hudson.maven.local_repo;
+
+import hudson.model.Descriptor;
+
+/**
+ * @author Kohsuke Kawaguchi
+ * @since 1.448
+ * @see LocalRepositoryLocator
+ */
+public abstract class LocalRepositoryLocatorDescriptor extends Descriptor<LocalRepositoryLocator> {
+}
diff --git a/maven-plugin/src/main/java/hudson/maven/local_repo/PerExecutorLocalRepositoryLocator.java b/maven-plugin/src/main/java/hudson/maven/local_repo/PerExecutorLocalRepositoryLocator.java
new file mode 100644
index 0000000000..f89f54b636
--- /dev/null
+++ b/maven-plugin/src/main/java/hudson/maven/local_repo/PerExecutorLocalRepositoryLocator.java
@@ -0,0 +1,28 @@
+package hudson.maven.local_repo;
+
+import hudson.Extension;
+import hudson.FilePath;
+import hudson.maven.AbstractMavenBuild;
+import hudson.model.Executor;
+import org.kohsuke.stapler.DataBoundConstructor;
+
+/**
+ * @author Kohsuke Kawaguchi
+ */
+public class PerExecutorLocalRepositoryLocator  extends LocalRepositoryLocator {
+    @DataBoundConstructor
+    public PerExecutorLocalRepositoryLocator() {}
+
+    @Override
+    public FilePath locate(AbstractMavenBuild build) {
+        return build.getBuiltOn().getRootPath().child("maven-repositories/"+ Executor.currentExecutor().getNumber());
+    }
+
+    @Extension
+    public static class DescriptorImpl extends LocalRepositoryLocatorDescriptor {
+        @Override
+        public String getDisplayName() {
+            return "Local to the executor";
+        }
+    }
+}
diff --git a/maven-plugin/src/main/java/hudson/maven/local_repo/PerJobLocalRepositoryLocator.java b/maven-plugin/src/main/java/hudson/maven/local_repo/PerJobLocalRepositoryLocator.java
new file mode 100644
index 0000000000..c2aa89d3ae
--- /dev/null
+++ b/maven-plugin/src/main/java/hudson/maven/local_repo/PerJobLocalRepositoryLocator.java
@@ -0,0 +1,30 @@
+package hudson.maven.local_repo;
+
+import hudson.Extension;
+import hudson.FilePath;
+import hudson.maven.AbstractMavenBuild;
+import org.kohsuke.stapler.DataBoundConstructor;
+
+/**
+ * Uses a local repository isolated per job.
+ *
+ * @author Kohsuke Kawaguchi
+ */
+public class PerJobLocalRepositoryLocator extends LocalRepositoryLocator {
+    @DataBoundConstructor
+    public PerJobLocalRepositoryLocator() {
+    }
+
+    @Override
+    public FilePath locate(AbstractMavenBuild build) {
+        return build.getWorkspace().child(".repository");
+    }
+
+    @Extension
+    public static class DescriptorImpl extends LocalRepositoryLocatorDescriptor {
+        @Override
+        public String getDisplayName() {
+            return "Local to the workspace";
+        }
+    }
+}
diff --git a/maven-plugin/src/main/resources/hudson/maven/MavenModuleSet/configure-entries.jelly b/maven-plugin/src/main/resources/hudson/maven/MavenModuleSet/configure-entries.jelly
index 68b993bd04..e760ee6fd6 100644
--- a/maven-plugin/src/main/resources/hudson/maven/MavenModuleSet/configure-entries.jelly
+++ b/maven-plugin/src/main/resources/hudson/maven/MavenModuleSet/configure-entries.jelly
@@ -97,7 +97,9 @@ THE SOFTWARE.
       <f:optionalBlock name="maven.perModuleBuild" title="${%Build modules in parallel}" help="/plugin/maven-plugin/aggregator.html"
         checked="${!it.aggregatorStyleBuild}" />
       <f:optionalBlock name="maven.usePrivateRepository" title="${%Use private Maven repository}" help="/plugin/maven-plugin/private-repository.html"
-        checked="${it.usesPrivateRepository()}" />
+                       checked="${it.getExplicitLocalRepository()!=null}" inline="true">
+        <f:dropdownDescriptorSelector title="${%Strategy}" field="explicitLocalRepository" />
+      </f:optionalBlock>
       <f:optionalBlock name="maven.perModuleEmail" title="${%Send e-mail for each failed module}" help="/plugin/maven-plugin/per-module-email.html"
         checked="${it.isPerModuleEmail()}" />
       <f:optionalBlock name="maven.resolveDependencies" title="${%Resolve Dependencies during Pom parsing}" 
diff --git a/maven-plugin/src/main/resources/hudson/maven/MavenModuleSet/global.jelly b/maven-plugin/src/main/resources/hudson/maven/MavenModuleSet/global.jelly
index 8dcf7a5bb4..08c83f5c51 100644
--- a/maven-plugin/src/main/resources/hudson/maven/MavenModuleSet/global.jelly
+++ b/maven-plugin/src/main/resources/hudson/maven/MavenModuleSet/global.jelly
@@ -31,5 +31,6 @@ THE SOFTWARE.
     <f:entry title="${%Global MAVEN_OPTS}" help="/plugin/maven-plugin/maven-opts.html">
       <f:expandableTextbox name="globalMavenOpts" value="${descriptor.globalMavenOpts}" />
     </f:entry>
+    <f:dropdownDescriptorSelector title="${%Local Maven Repository}" field="localRepository" />
   </f:section>
 </j:jelly>
\ No newline at end of file
diff --git a/maven-plugin/src/main/resources/hudson/maven/MavenModuleSet/help-localRepository.html b/maven-plugin/src/main/resources/hudson/maven/MavenModuleSet/help-localRepository.html
new file mode 100644
index 0000000000..2b3140d4e9
--- /dev/null
+++ b/maven-plugin/src/main/resources/hudson/maven/MavenModuleSet/help-localRepository.html
@@ -0,0 +1,5 @@
+<div>
+    Specifies the default setting of the local repository location when jobs do not specify one.
+    See the per-job configuration of this (under the "Advanced" button) for more discussion
+    of what this option means.
+</div>
\ No newline at end of file
diff --git a/maven-plugin/src/main/resources/hudson/maven/local_repo/LocalRepositoryLocator/config.groovy b/maven-plugin/src/main/resources/hudson/maven/local_repo/LocalRepositoryLocator/config.groovy
new file mode 100644
index 0000000000..a11ae6e464
--- /dev/null
+++ b/maven-plugin/src/main/resources/hudson/maven/local_repo/LocalRepositoryLocator/config.groovy
@@ -0,0 +1,3 @@
+package hudson.maven.local_repo.LocalRepositoryLocator;
+
+// default no-op config fragment
\ No newline at end of file
diff --git a/test/src/test/java/hudson/maven/MavenModuleSetTest.java b/test/src/test/java/hudson/maven/MavenModuleSetTest.java
new file mode 100644
index 0000000000..0341b3483e
--- /dev/null
+++ b/test/src/test/java/hudson/maven/MavenModuleSetTest.java
@@ -0,0 +1,23 @@
+package hudson.maven;
+
+import hudson.maven.local_repo.PerJobLocalRepositoryLocator;
+import org.jvnet.hudson.test.HudsonTestCase;
+
+/**
+ * @author Kohsuke Kawaguchi
+ */
+public class MavenModuleSetTest extends HudsonTestCase {
+    public void testConfigRoundtripLocalRepository() throws Exception {
+        MavenModuleSet p = createMavenProject();
+        configRoundtrip(p);
+        
+        assertNull(p.getExplicitLocalRepository());
+
+        // make sure it roundtrips
+        PerJobLocalRepositoryLocator before = new PerJobLocalRepositoryLocator();
+        p.setLocalRepository(before);
+        configRoundtrip(p);
+        assertEqualDataBoundBeans(p.getLocalRepository(),before);
+        assertTrue(before!=p.getLocalRepository());
+    }
+}
-- 
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