Add possibility to update specific packages

poetry/console/commands/update.py

@@ -10,20 +10,24 @@ class UpdateCommand(Command):
 
     update
         { packages?* : The packages to update. }
-        { --f|features=* : Features to install. }
         { --no-dev : Do not install dev dependencies. }
         { --dry-run : Outputs the operations but will not execute anything
                       (implicitly enables --verbose). }
     """
 
     def handle(self):
+        packages = self.argument('packages')
+
         installer = Installer(
             self.output,
             self.poetry.package,
             self.poetry.locker,
-            PyPiRepository()
+            self.poetry.repository
         )
 
+        if packages:
+            installer.whitelist({name: '*' for name in packages})
+
         installer.dev_mode(not self.option('no-dev'))
         installer.dry_run(self.option('dry-run'))
 

poetry/installation/installer.py

@@ -227,7 +227,7 @@ class Installer:
         self._installer.install(operation.package)
 
     def _execute_update(self, operation: Update) -> None:
-        source = operation.target_package
+        source = operation.initial_package
         target = operation.target_package
 
         if self._execute_operations or self.is_dry_run():