get travis running

.travis.yml

@@ -12,14 +12,11 @@ os:
   - linux
 
 env:
-  - SETUPTOOLS=19
-  - SETUPTOOLS=18
-  - SETUPTOOLS=17
+  - DATE=2015-01-01
 
 install:
-  - pip install -U pip
-  - pip uninstall -y setuptools
-  - pip install "setuptools<$SETUPTOOLS"
+  - python pip-date.py $DATE
+  - pip list
   - pip install -r requirements.txt
   - python setup.py sdist
   - pip install dist/*

pip-date.py

@@ -0,0 +1,53 @@
+#!/usr/bin/env python
+from __future__ import print_function
+import urllib
+import json
+import re
+import sys
+from bisect import bisect
+from datetime import datetime
+from datetime import timedelta
+
+from pip.commands.install import InstallCommand
+
+
+def get_releases(package_name):
+    url = 'https://pypi.python.org/pypi/%s/json' % package_name
+    return json.load(urllib.urlopen(url))['releases']
+
+
+def parse_iso8601(s):
+    return datetime(*map(int, re.split('[^\d]', s)))
+
+
+def select_version(select_date, package_name):
+    versions = []
+    for version, dists in get_releases(package_name).items():
+        date = [parse_iso8601(d['upload_time']) for d in dists]
+        if date:
+            versions.append((sorted(date)[0], version))
+
+    versions = sorted(versions)
+    min_date = versions[0][0]
+    if select_date < min_date:
+        raise Exception('invalid select_date: %s, must be '
+                        '%s or newer.' % (select_date, min_date))
+
+    return versions[bisect([x[0] for x in versions], select_date) - 1][1]
+
+
+date = parse_iso8601(sys.argv[1])
+args = ['%s==%s' % (p, select_version(date, p)) for p in sys.argv[2:]]
+
+pip = InstallCommand()
+options, args = pip.parse_args(args)
+options.force_reinstall = True
+options.ignore_installed = True
+
+try:
+    pip.run(options, args)
+except OSError as e:
+    if e.errno != 13:
+        raise e
+    print("You lack permissions to uninstall this package. Perhaps run with sudo? Exiting.")
+    exit(13)