--- a/hg_delta_editor.py
+++ b/hg_delta_editor.py
@@ -532,8 +532,10 @@ class HgChangeReceiver(delta.Editor):
                 self.commit_branches_empty[branch] = True
             else:
                 self.commit_branches_empty[branch] = False
-        if not (self._is_path_valid(path) and copyfrom_path and
-                self._is_path_valid(copyfrom_path)):
+        if not self._is_path_valid(path) or not copyfrom_path:
+            return
+        if copyfrom_path and not self._is_path_valid(copyfrom_path):
+            self.missing_plaintexts.add('%s/' % path)
             return
 
         cp_f, br_from = self._path_and_branch_for_path(copyfrom_path)

new file mode 100644
--- /dev/null
+++ b/tests/fixtures/test_files_copied_from_outside_btt.svndump
@@ -0,0 +1,170 @@
+SVN-fs-dump-format-version: 2
+
+UUID: df2126f7-00ab-4d49-b42c-7e981dde0bcf
+
+Revision-number: 0
+Prop-content-length: 56
+Content-length: 56
+
+K 8
+svn:date
+V 27
+2008-10-07T22:49:12.059692Z
+PROPS-END
+
+Revision-number: 1
+Prop-content-length: 111
+Content-length: 111
+
+K 7
+svn:log
+V 11
+Empty dirs.
+K 10
+svn:author
+V 5
+durin
+K 8
+svn:date
+V 27
+2008-10-07T22:49:41.118037Z
+PROPS-END
+
+Node-path: branches
+Node-kind: dir
+Node-action: add
+Prop-content-length: 10
+Content-length: 10
+
+PROPS-END
+
+
+Node-path: tags
+Node-kind: dir
+Node-action: add
+Prop-content-length: 10
+Content-length: 10
+
+PROPS-END
+
+
+Node-path: trunk
+Node-kind: dir
+Node-action: add
+Prop-content-length: 10
+Content-length: 10
+
+PROPS-END
+
+
+Revision-number: 2
+Prop-content-length: 108
+Content-length: 108
+
+K 7
+svn:log
+V 9
+Add alpha
+K 10
+svn:author
+V 5
+durin
+K 8
+svn:date
+V 27
+2008-10-07T23:23:02.991743Z
+PROPS-END
+
+Node-path: trunk/alpha
+Node-kind: file
+Node-action: add
+Prop-content-length: 10
+Text-content-length: 12
+Text-content-md5: 3c72ebf8bbd7fa88b1fdcee5398b5a17
+Content-length: 22
+
+PROPS-END
+file: alpha
+
+
+Revision-number: 3
+Prop-content-length: 115
+Content-length: 115
+
+K 7
+svn:log
+V 15
+Add third_party
+K 10
+svn:author
+V 5
+durin
+K 8
+svn:date
+V 27
+2008-10-27T03:16:13.831333Z
+PROPS-END
+
+Node-path: third_party
+Node-kind: dir
+Node-action: add
+Prop-content-length: 10
+Content-length: 10
+
+PROPS-END
+
+
+Node-path: third_party/magic
+Node-kind: dir
+Node-action: add
+Prop-content-length: 10
+Content-length: 10
+
+PROPS-END
+
+
+Node-path: third_party/magic/the_magic_software
+Node-kind: file
+Node-action: add
+Prop-content-length: 10
+Text-content-length: 7
+Text-content-md5: bc82cb068ef102a1f4e296992e5979ef
+Content-length: 17
+
+PROPS-END
+magic!
+
+
+Revision-number: 4
+Prop-content-length: 131
+Content-length: 131
+
+K 7
+svn:log
+V 31
+Copy magic in from third_party.
+K 10
+svn:author
+V 5
+durin
+K 8
+svn:date
+V 27
+2008-10-27T03:16:32.737023Z
+PROPS-END
+
+Node-path: trunk/magic
+Node-kind: dir
+Node-action: add
+Node-copyfrom-rev: 3
+Node-copyfrom-path: third_party/magic
+Prop-content-length: 34
+Content-length: 34
+
+K 13
+svn:mergeinfo
+V 0
+
+PROPS-END
+
+

--- a/tests/test_fetch_command.py
+++ b/tests/test_fetch_command.py
@@ -97,6 +97,12 @@ class TestBasicRepoLayout(unittest.TestC
                          'a47d0ce778660a91c31bf2c21c448e9ee296ac90')
         assert 'README' not in repo
 
+    def test_files_copied_from_outside_btt(self):
+        repo = self._load_fixture_and_fetch(
+            'test_files_copied_from_outside_btt.svndump')
+        self.assertEqual(node.hex(repo['tip'].node()),
+                         'c4e669a763a70f751c71d4534a34a65f398d71d4')
+        self.assertEqual(len(repo.changelog), 2)
 
 class TestStupidPull(unittest.TestCase):
     def setUp(self):