Hi!

make check passed.

[[[
Fix issue #3390, relative externals not updated during switch.

* subversion/libsvn_client/switch.c
  (svn_client__switch_internal): Pass in an external_func to
    svn_wc_crawl_revision5().

* subversion/libsvn_client/externals.c
  (handle_externals_desc_change): Get the url for parent_dir with
    svn_wc__node_get_url(). Does not work for export where the
    parent_dir has no url. Then we resort to the old way of adding the
    parent_dir to the from_url. 

* subversion/tests/cmdline/externals_tests.py
  (test_list): Remove XFail from switch_relative_external.

Patch by: Daniel Näslund <daniel{_AT_}longitudo.com>
]]]

When running the update_editor all externals that have changed is
recorded. But in a switch we need to change all relative externals. So I
added an external_func to collect those. 

The externals are collected in the same hashtables. There won't be any
problems if the same external is inserted a second time. It will only be
replaced as shown below. (The apr function for inserting new values into
a hashtable).

[[[
358 APR_DECLARE(void) apr_hash_set(apr_hash_t *ht,
359     const void *key,
360     apr_ssize_t klen,
361     const void *val)
362     {
363     apr_hash_entry_t **hep;
364     hep = find_entry(ht, key, klen, val);
365     if (*hep) {
366       if (!val) {
367         /* delete entry */
368         apr_hash_entry_t *old = *hep;
369         *hep = (*hep)->next;
370         old->next = ht->free;
371         ht->free = old;
372         --ht->count;
373       } 
373     }
374       else {
375         /* replace entry */
376         (*hep)->val = val;
377         /* check that the collision rate isn't too high */
378         if (ht->count > ht->max) {
379           expand_array(ht);
380         }
381       }
382     }
383     /* else key not present and val==NULL */ 
384 }
]]]

The reason I had to use the svn_wc__node_get_url() instead of
concanating from_url and parent_dir was because we're using the new
abs_paths crawlers and editors in libsvn_client/switch.c but that update
and export does not use those yet. (Disclaimer: I haven't fully grasped
what's going on inside libsvn_client/export.c. The
svn_delta_get_cancellation_editor() call is just mystery to me).

This is a fix for #3390, things will get tidier (more tidy?) once we're
using abspaths all over the place and have removed the adm_access
batons.

You can't believe all the strange places I've been to solve this. And
it was right under my nose the whole time. If it is indeed the solution
:-) ?

Daniel
Index: subversion/tests/cmdline/externals_tests.py
===================================================================
--- subversion/tests/cmdline/externals_tests.py	(revision 889114)
+++ subversion/tests/cmdline/externals_tests.py	(arbetskopia)
@@ -1481,7 +1481,7 @@
               external_into_path_with_spaces,
               binary_file_externals,
               XFail(update_lose_file_external),
-              XFail(switch_relative_external),
+              switch_relative_external,
               export_sparse_wc_with_externals,
               relegate_external,
              ]
Index: subversion/libsvn_client/switch.c
===================================================================
--- subversion/libsvn_client/switch.c	(revision 889114)
+++ subversion/libsvn_client/switch.c	(arbetskopia)
@@ -256,13 +256,15 @@
      PATH.  When we call reporter->finish_report, the update_editor
      will be driven by svn_repos_dir_delta2.
 
-     We pass NULL for traversal_info because this is a switch, not an
-     update, and therefore we don't want to handle any externals
-     except the ones directly affected by the switch. */
+     We pass in an external_func for recording all externals. It
+     shouldn't be needed for a switch if it wasn't for the relative
+     externals of type '../path'. All of those must be resolved to 
+     the new location.  */
   err = svn_wc_crawl_revisions5(ctx->wc_ctx, local_abspath, reporter,
                                 report_baton, TRUE, depth, (! depth_is_sticky),
                                 (! server_supports_depth),
-                                use_commit_times, NULL, NULL,
+                                use_commit_times, 
+                                svn_client__external_info_gatherer, &efb,
                                 ctx->notify_func2, ctx->notify_baton2, pool);
 
   if (err)
Index: subversion/libsvn_client/externals.c
===================================================================
--- subversion/libsvn_client/externals.c	(revision 889114)
+++ subversion/libsvn_client/externals.c	(arbetskopia)
@@ -556,6 +556,8 @@
   const char *url = item->url;
   apr_uri_t parent_dir_parsed_uri;
   apr_status_t status;
+  const char *my_url;
+  const char *abs_path;
 
   if ((url[0] == '/') && (url[1] == '/'))
     {
@@ -1115,6 +1117,9 @@
   int i;
   svn_wc_external_item2_t *item;
   const char *ambient_depth_w;
+  const char *url;
+  const char *abs_parent_dir;
+  svn_error_t *err;
   svn_depth_t ambient_depth;
 
   if (cb->is_export)
@@ -1193,19 +1198,31 @@
   ib.pool              = cb->pool;
   ib.iter_pool         = svn_pool_create(cb->pool);
 
-  /* Get the URL of the parent directory by appending a portion of
-     parent_dir to from_url.  from_url is the URL for to_path and
-     to_path is a substring of parent_dir, so append any characters in
-     parent_dir past strlen(to_path) to from_url (making sure to move
-     past a '/' in parent_dir, otherwise svn_path_url_add_component()
-     will error. */
-  len = strlen(cb->to_path);
-  if (ib.parent_dir[len] == '/')
-    ++len;
-  ib.parent_dir_url = svn_path_url_add_component2(cb->from_url,
-                                                  ib.parent_dir + len,
-                                                  cb->pool);
 
+  SVN_ERR(svn_dirent_get_absolute(&abs_parent_dir, ib.parent_dir, 
+                                  cb->pool));
+
+  err = svn_wc__node_get_url(&url, cb->ctx->wc_ctx, 
+                             abs_parent_dir, cb->pool, cb->pool);
+  ib.parent_dir_url = url;
+
+  if (err)
+    {
+      /* Get the URL of the parent directory by appending a portion of
+         parent_dir to from_url.  from_url is the URL for to_path and
+         to_path is a substring of parent_dir, so append any characters in
+         parent_dir past strlen(to_path) to from_url (making sure to move
+         past a '/' in parent_dir, otherwise svn_path_url_add_component()
+         will error. */
+      len = strlen(cb->to_path);
+      if (ib.parent_dir[len] == '/')
+        ++len;
+      ib.parent_dir_url = svn_path_url_add_component2(cb->from_url,
+                                                      ib.parent_dir + len,
+                                                      cb->pool);
+      svn_error_clear(err);
+    }
+
   /* We must use a custom version of svn_hash_diff so that the diff
      entries are processed in the order they were originally specified
      in the svn:externals properties. */

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