--- subversion/subversion/libsvn_client/copy.c.orig	2003-07-07 20:39:59.000000000 +0300
+++ subversion/subversion/libsvn_client/copy.c	2003-07-07 22:12:40.000000000 +0300
@@ -321,11 +321,63 @@
 
   /* Get the RA vtable that matches URL. */
   SVN_ERR (svn_ra_init_ra_libs (&ra_baton, pool));
-  SVN_ERR (svn_ra_get_ra_library (&ra_lib, ra_baton, top_url, pool));
 
   /* Get the auth dir. */
   SVN_ERR (svn_client__dir_if_wc (&auth_dir, "", pool));
 
+  /* This entire code block is meant to find out if the user is attempting
+   * a cross-repository copy, which is not supported yet.
+   * 
+   * We create a subpool and then destroy it if everything is OK, in order
+   * to free the resources we allocated for this test.
+   * */
+  {
+    svn_ra_plugin_t * src_ra_lib, * dest_ra_lib;
+    const char * src_uuid = NULL, * dest_uuid = NULL;
+    svn_error_t * src_err, *dest_err;
+    void * src_sess, * dest_sess;
+    apr_pool_t * subpool;
+
+    subpool = svn_pool_create(pool);
+
+    SVN_ERR(svn_ra_get_ra_library (&src_ra_lib, ra_baton, src_url, subpool));
+    SVN_ERR(svn_ra_get_ra_library (&dest_ra_lib, ra_baton, dst_url, subpool));
+
+    /* Open an RA session for the URL. Note that we don't have a local
+       directory, nor a place to put temp files or store the auth data. */
+    SVN_ERR (svn_client__open_ra_session (&src_sess, src_ra_lib, src_url,
+                                          auth_dir,
+                                          NULL, NULL, FALSE, TRUE,
+                                          ctx, subpool));
+
+    /* Open an RA session for the URL. Note that we don't have a local
+       directory, nor a place to put temp files or store the auth data. */
+    SVN_ERR (svn_client__open_ra_session (&dest_sess, dest_ra_lib, dst_url,
+                                          auth_dir,
+                                          NULL, NULL, FALSE, TRUE,
+                                          ctx, subpool));
+
+    /* Get the repository uuid of SRC_URL */
+    src_err = src_ra_lib->get_uuid(src_sess, &src_uuid, subpool);
+    if (src_err && src_err->apr_err != SVN_ERR_RA_NO_REPOS_UUID)
+      return src_err;
+
+    /* Get the repository uuid of DEST_URL */
+    dest_err = dest_ra_lib->get_uuid(dest_sess, &dest_uuid, subpool);
+    if (dest_err && dest_err->apr_err != SVN_ERR_RA_NO_REPOS_UUID)
+      return dest_err;
+
+    /* If the UUIDs are different - throw an error */
+    if (strcmp(src_uuid, dest_uuid))
+    {
+      return svn_error_createf(SVN_ERR_ILLEGAL_TARGET, NULL,
+                               "%s", "Copy operation on two different repositories");
+    }
+    svn_pool_destroy(subpool);
+  }
+  SVN_ERR (svn_ra_get_ra_library (&ra_lib, ra_baton, top_url, pool));
+
+
   /* Open an RA session for the URL. Note that we don't have a local
      directory, nor a place to put temp files or store the auth data. */
   SVN_ERR (svn_client__open_ra_session (&sess, ra_lib, top_url,