vcs: Fix internal server error when trying to get diff from Mercurial for paths that include globbing patterns (Issue #308):

- Treat passed-in paths as exact matches, dissallowing any type of
  globbing/regex/pattern matching.
- Added accompanying tests.

kallithea/lib/vcs/backends/hg/repository.py

@@ -265,7 +265,7 b' class MercurialRepository(BaseRepository'
             self.get_changeset(rev1)
         self.get_changeset(rev2)
         if path:
-            file_filter = match(self.path, '', [path])
+            file_filter = match(self.path, '', [path], exact=True)
         else:
             file_filter = None
 

kallithea/tests/vcs/test_repository.py

@@ -79,6 +79,14 b' class RepositoryGetDiffTest(_BackendTest'
                 ],
                 'removed': [FileNode('foobar')],
             },
+            {
+                'message': u'Commit that contains glob pattern in filename',
+                'author': 'Jane Doe <[e-mail]>',
+                'date': datetime.datetime(2010, 1, 1, 22),
+                'added': [
+                    FileNode('README{', content='Strangely-named README file'),
+                ],
+            },
         ]
         return commits
 
@@ -86,6 +94,11 b' class RepositoryGetDiffTest(_BackendTest'
         with self.assertRaises(ChangesetDoesNotExistError):
             self.repo.get_diff('a' * 40, 'b' * 40)
 
+    def test_glob_patterns_in_filename_do_not_raise_exception(self):
+        revs = self.repo.revisions
+
+        diff = self.repo.get_diff(revs[2], revs[3], path='README{') # should not raise
+
 
 class GitRepositoryGetDiffTest(RepositoryGetDiffTest, unittest.TestCase):
     backend_alias = 'git'
@@ -153,6 +166,18 b' index c11c37d41d33fb47741cff93fa5f9d798c'
 +FOOBAR
 ''')
 
+    def test_fourth_changeset_diff(self):
+        revs = self.repo.revisions
+        self.assertEqual(self.repo.get_diff(revs[2], revs[3]), '''diff --git a/README{ b/README{
+new file mode 100644
+index 0000000000000000000000000000000000000000..cdc0c1b5d234feedb37bbac19cd1b6442061102d
+--- /dev/null
++++ b/README{
+@@ -0,0 +1 @@
++Strangely-named README file
+\ No newline at end of file
+''')
+
 
 class HgRepositoryGetDiffTest(RepositoryGetDiffTest, unittest.TestCase):
     backend_alias = 'hg'
@@ -214,6 +239,17 b' diff --git a/foobar3 b/foobar3'
 +FOOBAR
 ''')
 
+    def test_fourth_changeset_diff(self):
+        revs = self.repo.revisions
+        self.assertEqual(self.repo.get_diff(revs[2], revs[3]), '''diff --git a/README{ b/README{
+new file mode 100644
+--- /dev/null
++++ b/README{
+@@ -0,0 +1,1 @@
++Strangely-named README file
+\ No newline at end of file
+''')
+
 
 # For each backend create test case class
 for alias in SCM_TESTS: