FEAT: add BroodRepositoryInfo.update to update to new instances.

enstaller/repository_info.py

@@ -131,6 +131,11 @@ def __init__(self, store_url, name, platform=None, python_tag=None):
         self._path = ("/api/v0/json/indices/{0._name}/{0._platform}/"
                       "{0._python_tag}/eggs".format(self))
 
+    def update(self, platform=None, python_tag=None):
+        return BroodRepositoryInfo(
+            self._store_url, self._name, platform, python_tag
+        )
+
     @property
     def index_url(self):
         return urllib.parse.urljoin(self._store_url, self._path)

enstaller/tests/test_repository_info.py

@@ -145,6 +145,34 @@ def test_eq_and_hashing(self):
         self.assertNotEqual(info1, info3)
         self.assertTrue(info1 != info3)
 
+    def test_update(self):
+        # Given
+        store_url = "https://acme.com"
+        name = "enthought/free"
+        python_tag = PythonImplementation.from_string("cp27").pep425_tag
+
+        r_index_url = ("https://acme.com/api/v0/json/indices/{0}/{1}/{2}/eggs"
+                       .format(name, enstaller.plat.custom_plat, python_tag))
+
+        # When
+        info = BroodRepositoryInfo(store_url, name, python_tag=python_tag)
+
+        # Then
+        self.assertEqual(info.index_url, r_index_url)
+        self.assertEqual(info.name, name)
+
+        # Given
+        python_tag = "cp34"
+        r_index_url = ("https://acme.com/api/v0/json/indices/{0}/{1}/{2}/eggs"
+                       .format(name, enstaller.plat.custom_plat, python_tag))
+
+        # When
+        info = info.update(python_tag=python_tag)
+
+        # Then
+        self.assertEqual(info.index_url, r_index_url)
+        self.assertEqual(info.name, name)
+
     def test_simple_python_package(self):
         # Given
         store_url = "https://acme.com"