recreate venv when -rrequire.txt changes

CONTRIBUTORS

@@ -25,6 +25,7 @@ Itxaka Serrano
 Jannis Leidel
 Josh Smeaton
 Julian Krause
+Kapil Thangavelu
 Krisztian Fekete
 Laszlo Vasko
 Lukasz Balcerzak

tests/test_config.py

@@ -9,6 +9,7 @@
 import tox
 import tox.config
 from tox.config import CommandParser
+from tox.config import DepConfig
 from tox.config import DepOption
 from tox.config import get_homedir
 from tox.config import get_version_info
@@ -129,6 +130,12 @@ def test_is_same_dep(self):
         assert DepOption._is_same_dep('pkg_hello-world3==1.0', 'pkg_hello-world3<=2.0')
         assert not DepOption._is_same_dep('pkg_hello-world3==1.0', 'otherpkg>=2.0')
 
+    def test_digest(self, tmpdir):
+        reqs = tmpdir.join('reqs.txt')
+        reqs.write('hello_world==1.0')
+        assert (DepConfig('-r%s' % (str(reqs))).digest == reqs.computehash())
+        assert (DepConfig('pkg_helloworld3==1.0').digest == "0" * 32)
+
 
 class TestConfigPlatform:
     def test_config_parse_platform(self, newconfig):

tox/config.py

@@ -910,6 +910,16 @@ def __init__(self, name, indexserver=None):
         self.name = name
         self.indexserver = indexserver
 
+    @property
+    def digest(self):
+        fname = str(self.name)
+        if fname.startswith('-r'):
+            fname = fname[2:]
+        path = py.path.local(fname)
+        if not path.check(file=1):
+            return "0" * 32
+        return path.computehash()
+
     def __str__(self):
         if self.indexserver:
             if self.indexserver.name == "default":

tox/venv.py

@@ -188,9 +188,7 @@ def _getliveconfig(self):
         alwayscopy = self.envconfig.alwayscopy
         deps = []
         for dep in self._getresolvedeps():
-            raw_dep = dep.name
-            md5 = getdigest(raw_dep)
-            deps.append((md5, raw_dep))
+            deps.append((dep.digest, dep.name))
         return CreationConfig(md5, python, version,
                               sitepackages, develop, deps, alwayscopy)