add version check on every run of the client

client/djrandom_client/client.py

@@ -124,6 +124,10 @@ def main():
     if args:
         parser.error('Too many arguments')
 
+    # Perform a version check.
+    if utils.check_version():
+        print >>sys.stderr, 'A new release is available! Please update.'
+
     # Reading from the configuration file will set this variable to
     # a string, convert it back into boolean.
     do_realtime = not opts.no_realtime_watch

client/djrandom_client/utils.py

 import hashlib
 import os
+import urllib2
+from djrandom_client import version
 
 NESTING = 2
+VERSION_PY_URL = 'https://git.autistici.org/djrandom/plain/client/djrandom_client/version.py'
 
 
 def generate_path(base_dir, sha1):
@@ -48,3 +51,31 @@ def read_config_defaults(parser, path):
                         path, 1 + linenum))
             var, value = map(lambda x: x.strip(), line.split('=', 1))
             parser.set_default(var, _unquote(value))
+
+
+def _split_version_string(s):
+    def _toint(x):
+        try:
+            return int(x)
+        except:
+            return x
+    return tuple(map(_toint, s.split('.')))
+
+
+def check_version():
+    """Returns True if we need to upgrade."""
+    try:
+        last_version_str = urllib2.urlopen(VERSION_PY_URL).read()
+    except:
+        return False
+
+    match = re.match(r'VERSION\s*=\s*[\'"]([0-9a-z.]+)[\'"]',
+                     last_version_str.strip())
+    if not match:
+        return False
+    last_version_t = _split_version_string(match.group(1))
+    cur_version_t = _split_version_string(version.VERSION)
+
+    return cur_version_t <= last_version_t
+
+

client/djrandom_client/version.py

+VERSION = '0.2'

client/setup.py

 #!/usr/bin/python
 
+# Read version from version.py.
+import sys, os
+sys.path.insert(0, os.path.dirname(__file__))
+from djrandom_client import version
+
 from setuptools import setup, find_packages
 import platform
 if platform.system() == 'Darwin':
@@ -9,7 +14,7 @@ else:
 
 setup(
   name="djrandom-client",
-  version="0.1",
+  version=version.VERSION,
   description="DJ:Random client",
   author="ale",
   author_email="ale@incal.net",