Lazy Keyring intialization for PasswordManager (#1892)

poetry/utils/password_manager.py

@@ -117,35 +117,40 @@ def _check(self):
 class PasswordManager:
     def __init__(self, config):
         self._config = config
-        self._keyring = KeyRing("poetry-repository")
-        if not self._keyring.is_available():
-            logger.warning("Using a plaintext file to store and retrieve credentials")
+        self._keyring = None
 
     @property
     def keyring(self):
+        if self._keyring is None:
+            self._keyring = KeyRing("poetry-repository")
+            if not self._keyring.is_available():
+                logger.warning(
+                    "Using a plaintext file to store and retrieve credentials"
+                )
+
         return self._keyring
 
     def set_pypi_token(self, name, token):
-        if not self._keyring.is_available():
+        if not self.keyring.is_available():
             self._config.auth_config_source.add_property(
                 "pypi-token.{}".format(name), token
             )
         else:
-            self._keyring.set_password(name, "__token__", token)
+            self.keyring.set_password(name, "__token__", token)
 
     def get_pypi_token(self, name):
-        if not self._keyring.is_available():
+        if not self.keyring.is_available():
             return self._config.get("pypi-token.{}".format(name))
 
-        return self._keyring.get_password(name, "__token__")
+        return self.keyring.get_password(name, "__token__")
 
     def delete_pypi_token(self, name):
-        if not self._keyring.is_available():
+        if not self.keyring.is_available():
             return self._config.auth_config_source.remove_property(
                 "pypi-token.{}".format(name)
             )
 
-        self._keyring.delete_password(name, "__token__")
+        self.keyring.delete_password(name, "__token__")
 
     def get_http_auth(self, name):
         auth = self._config.get("http-basic.{}".format(name))
@@ -154,7 +159,7 @@ def get_http_auth(self, name):
 
         username, password = auth["username"], auth.get("password")
         if password is None:
-            password = self._keyring.get_password(name, username)
+            password = self.keyring.get_password(name, username)
 
         return {
             "username": username,
@@ -164,10 +169,10 @@ def get_http_auth(self, name):
     def set_http_password(self, name, username, password):
         auth = {"username": username}
 
-        if not self._keyring.is_available():
+        if not self.keyring.is_available():
             auth["password"] = password
         else:
-            self._keyring.set_password(name, username, password)
+            self.keyring.set_password(name, username, password)
 
         self._config.auth_config_source.add_property("http-basic.{}".format(name), auth)
 
@@ -177,7 +182,7 @@ def delete_http_password(self, name):
             return
 
         try:
-            self._keyring.delete_password(name, auth["username"])
+            self.keyring.delete_password(name, auth["username"])
         except KeyRingError:
             pass