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As per discussion in the thread [1], attaching the patch herewith.

Log:
Make a proper fix to resolve some deprecation warnings using
`svn_path_url_add_component2()' by canonicalizing the base before
passing to the above method.

[in subversion/libsvn_ra_neon]

* commit.c
 (get_version_url, create_activity, commit_add_dir, commit_add_file
  commit_close_file, add_child, commit_delete_entry): Use
  `svn_path_url_add_component2()'.
 (svn_ra_neon__get_commit_editor, checkout_resource, apply_revprops):
  Canonicalize the base before passing to
  `svn_path_url_add_component2()'.

* props.c
 (svn_ra_neon__get_baseline_info): Canonicalize the base before
  passing to `svn_path_url_add_component2()'.

Found and Suggested by: stsp
Patch by: Kannan R <kann...@collab.net>

[1]-http://mail-archives.apache.org/mod_mbox/subversion-dev/200912.mbox/%3c4b1deee0.6010...@collab.net%3e

- --
Thanks & Regards,
Kannan
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Index: subversion/libsvn_ra_neon/commit.c
===================================================================
--- subversion/libsvn_ra_neon/commit.c	(revision 885339)
+++ subversion/libsvn_ra_neon/commit.c	(working copy)
@@ -203,9 +203,9 @@
          the version resource URL of RSRC. */
       if (parent && parent->vsn_url && parent->revision == rsrc->revision)
         {
-          rsrc->vsn_url = svn_path_url_add_component(parent->vsn_url,
-                                                     rsrc->name,
-                                                     rsrc->pool);
+          rsrc->vsn_url = svn_path_url_add_component2(parent->vsn_url,
+                                                      rsrc->name,
+                                                      rsrc->pool);
           return SVN_NO_ERROR;
         }
 
@@ -231,7 +231,7 @@
                                              rsrc->revision,
                                              pool));
 
-      url = svn_path_url_add_component(bc_url.data, bc_relative.data, pool);
+      url = svn_path_url_add_component2(bc_url.data, bc_relative.data, pool);
     }
 
   /* Get the DAV:checked-in property, which contains the URL of the
@@ -325,8 +325,8 @@
      the activity, and create the activity.  The URL for our activity
      will be ACTIVITY_COLL/UUID */
   SVN_ERR(get_activity_collection(cc, &activity_collection, FALSE, pool));
-  url = svn_path_url_add_component(activity_collection->data,
-                                   uuid_buf, pool);
+  url = svn_path_url_add_component2(activity_collection->data,
+                                    uuid_buf, pool);
   SVN_ERR(svn_ra_neon__simple_request(&code, cc->ras,
                                       "MKACTIVITY", url, NULL, NULL,
                                       201 /* Created */,
@@ -338,8 +338,8 @@
   if (code == 404)
     {
       SVN_ERR(get_activity_collection(cc, &activity_collection, TRUE, pool));
-      url = svn_path_url_add_component(activity_collection->data,
-                                       uuid_buf, pool);
+      url = svn_path_url_add_component2(activity_collection->data,
+                                        uuid_buf, pool);
       SVN_ERR(svn_ra_neon__simple_request(&code, cc->ras,
                                           "MKACTIVITY", url, NULL, NULL,
                                           201, 0, pool));
@@ -373,7 +373,7 @@
   rsrc->pool = pool;
   rsrc->revision = revision;
   rsrc->name = name;
-  rsrc->url = svn_path_url_add_component(parent->url, name, pool);
+  rsrc->url = svn_path_url_add_component2(parent->url, name, pool);
   rsrc->local_path = svn_path_join(parent->local_path, name, pool);
 
   /* Case 1:  the resource is truly "new".  Either it was added as a
@@ -382,7 +382,7 @@
      URL by the rules of deltaV:  "copy structure is preserved below
      the WR you COPY to."  */
   if (created || (parent->vsn_url == NULL))
-    rsrc->wr_url = svn_path_url_add_component(parent->wr_url, name, pool);
+    rsrc->wr_url = svn_path_url_add_component2(parent->wr_url, name, pool);
 
   /* Case 2: the resource is already under version-control somewhere.
      This means it has a VR URL already, and the WR URL won't exist
@@ -517,8 +517,7 @@
       return svn_error_createf(SVN_ERR_RA_DAV_MALFORMED_DATA, NULL,
                                _("Unable to parse URL '%s'"), locn);
     }
-
-  rsrc->wr_url = apr_pstrdup(rsrc->pool, parse.path);
+  rsrc->wr_url = svn_uri_canonicalize(parse.path, rsrc->pool);
   ne_uri_free(&parse);
 
   return SVN_NO_ERROR;
@@ -714,7 +713,7 @@
   SVN_ERR(checkout_resource(parent->cc, parent->rsrc, TRUE, NULL, pool));
 
   /* create the URL for the child resource */
-  child = svn_path_url_add_component(parent->rsrc->wr_url, name, pool);
+  child = svn_path_url_add_component2(parent->rsrc->wr_url, name, pool);
 
   /* Start out assuming that we're deleting a file;  try to lookup the
      path itself in the token-hash, and if found, attach it to the If:
@@ -729,8 +728,8 @@
           const char *token_header_val;
           const char *token_uri;
 
-          token_uri = svn_path_url_add_component(parent->cc->ras->url->data,
-                                                 path, pool);
+          token_uri = svn_path_url_add_component2(parent->cc->ras->url->data,
+                                                  path, pool);
           token_header_val = apr_psprintf(pool, "<%s> (<%s>)",
                                           token_uri, token);
           extra_headers = apr_hash_make(pool);
@@ -888,9 +887,9 @@
          "source" argument to the COPY request.  The "Destination:"
          header given to COPY is simply the wr_url that is already
          part of the child object. */
-      copy_src = svn_path_url_add_component(bc_url.data,
-                                            bc_relative.data,
-                                            workpool);
+      copy_src = svn_path_url_add_component2(bc_url.data,
+                                             bc_relative.data,
+                                             workpool);
 
       /* Have neon do the COPY. */
       SVN_ERR(svn_ra_neon__copy(parent->cc->ras,
@@ -1088,9 +1087,9 @@
          "source" argument to the COPY request.  The "Destination:"
          header given to COPY is simply the wr_url that is already
          part of the file_baton. */
-      copy_src = svn_path_url_add_component(bc_url.data,
-                                            bc_relative.data,
-                                            workpool);
+      copy_src = svn_path_url_add_component2(bc_url.data,
+                                             bc_relative.data,
+                                             workpool);
 
       /* Have neon do the COPY. */
       SVN_ERR(svn_ra_neon__copy(parent->cc->ras,
@@ -1271,9 +1270,9 @@
         svn_ra_neon__set_header
           (extra_headers, "If",
            apr_psprintf(pool, "<%s> (<%s>)",
-                        svn_path_url_add_component(cc->ras->url->data,
-                                                   file->rsrc->url,
-                                                   request->pool),
+                        svn_path_url_add_component2(cc->ras->url->data,
+                                                    file->rsrc->url,
+                                                    request->pool),
                         file->token));
 
       if (pb->base_checksum)
@@ -1389,7 +1388,7 @@
                                       vcc, NULL,
                                       &svn_ra_neon__checked_in_prop, pool));
     baseline_rsrc.pool = pool;
-    baseline_rsrc.vsn_url = baseline_url->data;
+    baseline_rsrc.vsn_url = svn_uri_canonicalize(baseline_url->data, pool);
 
     /* To set the revision properties, we must checkout the latest baseline
        and get back a mutable "working" baseline.  */
@@ -1452,6 +1451,8 @@
   /* ### should we perform an OPTIONS to validate the server we're about
      ### to talk to? */
 
+  cc->ras->act_coll = svn_uri_canonicalize(cc->ras->act_coll, pool);
+
   /*
   ** Create an Activity. This corresponds directly to an FS transaction.
   ** We will check out all further resources within the context of this
Index: subversion/libsvn_ra_neon/props.c
===================================================================
--- subversion/libsvn_ra_neon/props.c	(revision 885339)
+++ subversion/libsvn_ra_neon/props.c	(working copy)
@@ -991,7 +991,10 @@
 
   /* maybe return bc_url to the caller */
   if (bc_url)
-    *bc_url = *my_bc_url;
+    {
+      bc_url->data = svn_uri_canonicalize(my_bc_url->data, pool);
+      bc_url->len = my_bc_url->len;
+    }
 
   if (latest_rev != NULL)
     {

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