Issue 6728 - Remove Mercurial dependency

cms/sources.py

Index: cms/sources.py
===================================================================
--- a/cms/sources.py
+++ b/cms/sources.py
@@ -14,19 +14,18 @@
 # along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
 
 import io
 import collections
 import ConfigParser
 import json
 import os
 from StringIO import StringIO
-import subprocess
+from random import randint
 import urlparse
-import zipfile
 import logging
 
 
 class Source:
     def resolve_link(self, url, locale):
         parsed = urlparse.urlparse(url)
         page = parsed.path
         if parsed.scheme != '' or page.startswith('/') or page.startswith('.'):
@@ -216,75 +215,33 @@
 
     def has_include(self, include, format):
         return self.has_file(self.include_filename(include, format))
 
     def read_include(self, include, format):
         return self.read_file(self.include_filename(include, format))
 
 
-class MercurialSource(Source):
-    def __init__(self, repo, revision):
-        command = ['hg', '-R', repo, 'archive', '-r', revision,
-                   '-t', 'uzip', '-p', 'root', '-']
-        data = subprocess.check_output(command)
-        self._archive = zipfile.ZipFile(StringIO(data), mode='r')
-
-        command = ['hg', '-R', repo, 'id', '-n', '-r', revision]
-        self.version = subprocess.check_output(command).strip()
-
-        self._name = os.path.basename(repo.rstrip(os.path.sep))
-
-    def __enter__(self):
-        return self
-
-    def __exit__(self, type, value, traceback):
-        self.close()
-        return False
-
-    def close(self):
-        self._archive.close()
-
-    def has_file(self, filename):
-        try:
-            self._archive.getinfo('root/' + filename)
-        except KeyError:
-            return False
-        return True
-
-    def read_file(self, filename, binary=False):
-        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 = '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
-
-
 class FileSource(Source):
     def __init__(self, dir):
         self._dir = dir
 
     def __enter__(self):
         return self
 
     def __exit__(self, type, value, traceback):
         return False
 
     def close(self):
         pass
 
+    @property
+    def version(self):
+        return randint(1, 2 ** 32)
+
     def get_path(self, filename):
         return os.path.join(self._dir, *filename.split('/'))
 
     def has_file(self, filename):
         return os.path.isfile(self.get_path(filename))
 
     def read_file(self, filename, binary=False):
         path = self.get_path(filename)
@@ -406,33 +363,25 @@
 def create_source(path, cached=False, revision=None):
     """Create a source from path and optional revision.
 
     `cached` flag activates caching. This can be used to optimize performance
     if no changes are expected on the filesystem after the source was created.
     This is usually the case with static generation (as opposed to dynamic
     preview).
 
-    If `revision` option is provided, the `path` is assumed to be pointing to a
-    Mercurial repository. In this case the source will return the content of
-    selected revision (using `MercurialSource`) instead of the content of the
-    directory. Note that any local changes will be ignored in this case.
-
     If `settings.ini` in the source contains `[paths]` section with an
     `additional-paths` key that contains the list of additional root folders,
     `MultiSource` will be instantiated and its bases will be the original
     source plus an additional source for each additional root folder.
     `MultiSource` looks up files in its base sources in the order they are
     provided, so the files in the additional folders will only be used if the
     original source doesn't contain that file.
     """
-    if revision is not None:
-        source = MercurialSource(path, revision)
-    else:
-        source = FileSource(path)
+    source = FileSource(path)
 
     config = source.read_config()
     try:
         ap = config.get('paths', 'additional-paths').strip()
         additional_paths = filter(None, ap.split())
     except (ConfigParser.NoSectionError, ConfigParser.NoOptionError):
         additional_paths = []