svn project within project fails

fix.patch

diff --git a/zest/releaser/svn.py b/zest/releaser/svn.py
index 45c10ad..44696ed 100644
--- a/zest/releaser/svn.py
+++ b/zest/releaser/svn.py
@@ -28,7 +28,7 @@ class Subversion(BaseVersionControl):
         # Note: slashes are used to prevent problems with 'tha.tagfinder'-like
         # project names...
         for remove in ['/trunk', '/tags', '/branches', '/tag', '/branch']:
-            base = base.split(remove)[0]
+            base = base.rsplit(remove, 1)[0]
         if not base.endswith('/'):
             base += '/'
         logger.debug("Base url is %s", base)

testcase.patch

diff --git a/zest/releaser/tests/svn.txt b/zest/releaser/tests/svn.txt
index 8133a59..17ec6ee 100644
--- a/zest/releaser/tests/svn.txt
+++ b/zest/releaser/tests/svn.txt
@@ -334,3 +334,56 @@ the singular /tag and /branch is used:
     >>> singular_checkout = svn.Subversion()
     >>> singular_checkout._base_from_svn()
     'file://TESTREPO/singular/'
+
+Tags within a trunk
+----------------------------
+Some legacy projects, often converted from CVS, have multiple subprojects
+under a single trunk.  This creates URLs that contain a regular svn layout
+within an top level trunk. For example::
+
+    trunk/
+        projectA/
+            trunk/
+            tags/
+            branches/
+
+        projectB
+            trunk/
+            tags/
+            branches/
+
+Create trunk/ for both projects:
+
+    >>> repo_url
+    'file://TESTREPO'
+    >>> cmd = 'svn mkdir --parents %s/trunk/projectA/trunk -m"mk projectA"' % repo_url
+    >>> dont_care = system(cmd)
+    >>> cmd = 'svn mkdir %s/trunk/projectB/trunk -m "mkdir projectB"' % repo_url
+    >>> dont_care = system(cmd)
+
+Make a checkout:
+
+    >>> os.chdir(tempdir)
+    >>> cmd = 'svn co %s/trunk' % repo_url
+    >>> dont_care = system(cmd)
+
+Now check that we try to create the proper trunk/projectA/tags directory
+
+    >>> os.chdir('trunk/projectA/trunk')
+    >>> from zest.releaser import utils
+    >>> utils.TESTMODE = True
+    >>> sample_checkout = svn.Subversion()
+    >>> utils.answers_for_testing = ['y']
+    >>> sample_checkout.available_tags()
+    tags dir does not exist at file://TESTREPO/trunk/projectA/tags
+    Question: Shall I create it (Y/n)?
+    Our reply: y
+    <BLANKLINE>
+    Committed revision 18.
+    []
+    >>> cmd = 'svn list -R %s/trunk' % repo_url
+    >>> print system(cmd)
+    projectA/
+    projectA/tags/
+    projectA/trunk/
+    <BLANKLINE>