Issue 4217 - Fix Prefix Regression Due To Mercurial Version Behavior Change

cms/sources.py

Index: cms/sources.py
===================================================================
--- a/cms/sources.py
+++ b/cms/sources.py
@@ -201,17 +201,17 @@
 
     def read_include(self, include, format):
         return self.read_file(self.include_filename(include, format))
 
 
 class MercurialSource(Source):
     def __init__(self, repo):
         command = ['hg', '-R', repo, 'archive', '-r', 'default',
-                   '-t', 'uzip', '-p', '.', '-']
+                   '-t', 'uzip', '-p', 'root', '-']
         data = subprocess.check_output(command)
         self._archive = zipfile.ZipFile(StringIO(data), mode='r')
 
         command = ['hg', '-R', repo, 'id', '-n', '-r', 'default']
         self.version = subprocess.check_output(command).strip()
 
         self._name = os.path.basename(repo.rstrip(os.path.sep))
 
@@ -222,29 +222,29 @@
         self.close()
         return False
 
     def close(self):
         self._archive.close()
 
     def has_file(self, filename):
         try:
-            self._archive.getinfo('./%s' % filename)
+            self._archive.getinfo('root/' + filename)
         except KeyError:
             return False
         return True
 
     def read_file(self, filename, binary=False):
-        data = self._archive.read('./%s' % filename)
+        data = self._archive.read('root/' + filename)
         if not binary:
             data = data.decode('utf-8')
         return (data, '%s!%s' % (self._name, filename))
 
     def list_files(self, subdir):
-        prefix = './%s/' % subdir
+        prefix = 'root/{}/'.format(subdir)
         for filename in self._archive.namelist():
             if filename.startswith(prefix):
                 yield filename[len(prefix):]
 
     if os.name == 'posix':
         def get_cache_dir(self):
             return '/var/cache/' + self._name