Index: src/main/java/hudson/plugins/mercurial/MercurialSCM.java
===================================================================
--- src/main/java/hudson/plugins/mercurial/MercurialSCM.java	(révision 12555)
+++ src/main/java/hudson/plugins/mercurial/MercurialSCM.java	(copie de travail)
@@ -28,7 +28,7 @@
 
 /**
  * Mercurial SCM.
- * 
+ *
  * @author Kohsuke Kawaguchi
  */
 public class MercurialSCM extends SCM implements Serializable {
@@ -36,7 +36,7 @@
      * Source repository URL from which we pull.
      */
     private final String source;
-    
+
     /**
      * Prefixes of files within the repository which we're dependent on.
      * Storing as member variable so as to only parse the dependencies string once.
@@ -44,9 +44,9 @@
     private transient final Set<String> _modules = new HashSet<String>();
     // Same thing, but not parsed for jelly.
     private final String modules;
-    
+
     /**
-     * In-repository branch to follow. Null indicates "default". 
+     * In-repository branch to follow. Null indicates "default".
      */
     private final String branch;
 
@@ -113,8 +113,15 @@
         FilePath tmpFile = workspace.createTextTempFile("tmp", "style", FILES_STYLE);
 
         // Get the list of changed files.
+        ArgumentListBuilder args = new ArgumentListBuilder();
+        args.add(getDescriptor().getHgExe(), "incoming", "--style",
+                        tmpFile.getRemote());
+        if (branch != null) {
+            args.add("-r", branch);
+        }
+
         launcher.launch(
-                new String[]{getDescriptor().getHgExe(), "incoming", "--style", tmpFile.getRemote()},
+                args.toCommandArray(),
                 EnvVars.masterEnvVars, new ForkOutputStream(baos, output), workspace).join();
 
 
@@ -272,9 +279,28 @@
                 listener.error("Failed to pull");
                 return false;
             }
+            // pull
+            hgBundle.delete(); // do not leave it in workspace
 
-        hgBundle.delete(); // do not leave it in workspace
+        // nuxeo patch update to the right branch after a pull
+        try {
+            ArgumentListBuilder args = new ArgumentListBuilder();
+            args.add(getDescriptor().getHgExe(), "update", "-C");
+            if (branch != null) {
+                args.add("-r", branch);
+            }
+            if (launcher.launch(args.toCommandArray(), build.getEnvVars(),
+                    listener.getLogger(), workspace).join() != 0) {
+                listener.error("Failed to update");
+                return false;
+            }
+        } catch (IOException e) {
+            listener.error("Failed to update");
+            return false;
+        }
 
+
+
         return true;
     }