o changing the strategy for downloading to make File.renameTo workable.

git-svn-id: https://svn.apache.org/repos/asf/maven/components/trunk@162964 13f79535-47bb-0310-9956-ffa450edef68

maven-artifact/src/main/java/org/apache/maven/artifact/manager/DefaultWagonManager.java

@@ -31,12 +31,14 @@ import org.apache.maven.wagon.authorization.AuthorizationException;
 import org.apache.maven.wagon.observers.ChecksumObserver;
 import org.codehaus.plexus.PlexusConstants;
 import org.codehaus.plexus.PlexusContainer;
+import org.codehaus.plexus.util.FileUtils;
 import org.codehaus.plexus.component.repository.exception.ComponentLookupException;
 import org.codehaus.plexus.context.Context;
 import org.codehaus.plexus.context.ContextException;
 import org.codehaus.plexus.personality.plexus.lifecycle.phase.Contextualizable;
 
 import java.io.File;
+import java.io.IOException;
 import java.util.Iterator;
 import java.util.Set;
 
@@ -134,7 +136,7 @@ public class DefaultWagonManager
 
         try
         {
-            temp = File.createTempFile( "wagon", "tmp" );
+            temp = new File( destination + ".tmp" );
 
             temp.deleteOnExit();
         }
@@ -149,7 +151,6 @@ public class DefaultWagonManager
 
             try
             {
-
                 Wagon wagon = getWagon( repository.getProtocol() );
 
                 // ----------------------------------------------------------------------
@@ -165,8 +166,6 @@ public class DefaultWagonManager
 
                 wagon.get( path( artifact ), temp );
 
-                transfered = true;
-
                 wagon.disconnect();
 
                 releaseWagon( wagon );
@@ -176,6 +175,8 @@ public class DefaultWagonManager
             {
                 // This one we will eat when looking through remote repositories
                 // because we want to cycle through them all before squawking.
+
+                continue;
             }
             catch ( UnsupportedProtocolException e )
             {
@@ -197,26 +198,37 @@ public class DefaultWagonManager
             {
                 throw new TransferFailedException( "Release of wagon failed: ", e );
             }
-        }
 
-        if ( transfered )
-        {
             if ( !destination.getParentFile().exists() )
             {
                 destination.getParentFile().mkdirs();
             }
 
-            transfered = temp.renameTo( destination );
+            // The temporary file is named destination + ".tmp" and is done this way to ensure
+            // that the temporary file is in the same file system as the destination because the
+            // File.renameTo operation doesn't really work across file systems. So we will attempt
+            // to do a File.renameTo for efficiency and atomicity, if this fails then we will use
+            // a brute force copy and delete the temporary file.
+
+            if ( !temp.renameTo( destination ) )
+            {
+                try
+                {
+                    FileUtils.copyFile( temp, destination );
+
+                    temp.delete();
+                }
+                catch ( IOException e )
+                {
+                    throw new TransferFailedException( "Error copying temporary file to the final destination: ", e );
+                }
+            }
 
             return;
         }
-        else
-        {
-            temp.delete();
 
         throw new TransferFailedException( "Resource doesn't exist in any remote repository" );
     }
-    }
 
     public void contextualize( Context context )
         throws ContextException