allow removing plugin files

conans/client/graph/compatibility.py

@@ -51,25 +51,22 @@ def cppstd_compat(conanfile):
 """
 
 
-def get_binary_compatibility_file_paths(cache):
+def migrate_compatibility_files(cache):
+    from conans.client.migrations import update_file
     compatible_folder = os.path.join(cache.plugins_path, "compatibility")
     compatibility_file = os.path.join(compatible_folder, "compatibility.py")
     cppstd_compat_file = os.path.join(compatible_folder, "cppstd_compat.py")
-    return compatibility_file, cppstd_compat_file
-
-
-def migrate_compatibility_files(cache):
-    from conans.client.migrations import update_file
-
-    compatibility_file, cppstd_compat_file = get_binary_compatibility_file_paths(cache)
     update_file(compatibility_file, _default_compat)
     update_file(cppstd_compat_file, _default_cppstd_compat)
 
 
 class BinaryCompatibility:
 
     def __init__(self, cache):
-        compatibility_file, cppstd_compat_file = get_binary_compatibility_file_paths(cache)
+        compatibility_file = os.path.join(cache.plugins_path, "compatibility", "compatibility.py")
+        if not os.path.exists(compatibility_file):
+            raise ConanException("The 'compatibility.py' plugin file doesn't exist. If you want "
+                                 "to disable it, edit its contents instead of removing it")
         mod, _ = load_python_file(compatibility_file)
         self._compatibility = mod.compatibility
 

conans/client/profile_loader.py

@@ -112,6 +112,10 @@ def get_default_build(self):
 
     def _load_profile_plugin(self):
         profile_plugin = os.path.join(self._cache.plugins_path, "profile.py")
+        if not os.path.exists(profile_plugin):
+            raise ConanException("The 'profile.py' plugin file doesn't exist. If you want "
+                                 "to disable it, edit its contents instead of removing it")
+
         mod, _ = load_python_file(profile_plugin)
         if hasattr(mod, "profile_plugin"):
             return mod.profile_plugin

conans/test/integration/configuration/test_profile_plugin.py

@@ -19,3 +19,10 @@ def profile_plugin(profile):
         c.run("install --requires=zlib/1.2.3", assert_error=True)
         assert "Error while processing 'profile.py' plugin, line 2" in c.out
         assert "settings = profile.kk" in c.out
+
+    def test_remove_plugin_file(self):
+        c = TestClient()
+        c.run("version")  # to trigger the creation
+        os.remove(os.path.join(c.cache.plugins_path, "profile.py"))
+        c.run("profile show", assert_error=True)
+        assert "ERROR: The 'profile.py' plugin file doesn't exist" in c.out

conans/test/integration/package_id/test_cache_compatibles.py

@@ -336,3 +336,11 @@ def compatibility(conanfile):
         assert "Error while processing 'compatibility.py' plugin for 'dep/0.1', line 3" in c.out
         assert "while calling 'debug_compat', line 2" in c.out
         assert "while calling 'other', line 5" in c.out
+
+    def test_remove_plugin_file(self):
+        c = TestClient()
+        c.run("version")  # to trigger the creation
+        os.remove(os.path.join(c.cache.plugins_path, "compatibility", "compatibility.py"))
+        c.save({"conanfile.txt": ""})
+        c.run("install .", assert_error=True)
+        assert "ERROR: The 'compatibility.py' plugin file doesn't exist" in c.out