Split AliasSearchPath out of Channel

diff --git a/pinch.py b/pinch.py
index 26982260cc62c5f485175c6ee77e84868909a0a5..34c63f1d4b418380142baf28334507485f3f372f 100644 (file)
--- a/pinch.py
+++ b/pinch.py
@@ -1,3 +1,4 @@
+from abc import ABC, abstractmethod
 import argparse
 import configparser
 import filecmp
@@ -85,12 +86,22 @@ class ChannelTableEntry(types.SimpleNamespace):
     url: str
 
 
-class SearchPath(types.SimpleNamespace):
+class SearchPath(types.SimpleNamespace, ABC):
     release_name: str
 
+    @abstractmethod
+    def pin(self, v: Verification, conf: configparser.SectionProxy) -> None:
+        pass
 
-class Channel(SearchPath):
+
+class AliasSearchPath(SearchPath):
     alias_of: str
+
+    def pin(self, v: Verification, conf: configparser.SectionProxy) -> None:
+        assert not hasattr(self, 'git_repo')
+
+
+class Channel(SearchPath):
     channel_html: bytes
     channel_url: str
     forwarded_url: str
@@ -101,10 +112,6 @@ class Channel(SearchPath):
     table: Dict[str, ChannelTableEntry]
 
     def pin(self, v: Verification, conf: configparser.SectionProxy) -> None:
-        if hasattr(self, 'alias_of'):
-            assert not hasattr(self, 'git_repo')
-            return
-
         if hasattr(self, 'git_revision'):
             self.old_git_revision = self.git_revision
             del self.git_revision
@@ -528,6 +535,8 @@ def git_revision_name(v: Verification, channel: Channel) -> str:
 
 
 def read_search_path(conf: configparser.SectionProxy) -> SearchPath:
+    if 'alias_of' in conf:
+        return AliasSearchPath(**dict(conf.items()))
     return Channel(**dict(conf.items()))