Correct way to allow setting context with existing

This reverts commit 5c4d3eeffd.

Original solution has introduced special workaround (strict flag) which
contradicts the concept of immutable context. Moreover, it introduces
possible side-effects, because child process will use the one set by
parent instead of having own one.

The correct solution is to re-create context in process entry point

Sorry, it was Jan 1 and I was drunk :(

src/ahriman/core/__init__.py

@@ -58,26 +58,23 @@ class _Context:
             raise ValueError(f"Value {value} is not an instance of {key.return_type}")
         return value
 
-    def set(self, key: ContextKey[T], value: T, strict: bool = True) -> None:
+    def set(self, key: ContextKey[T], value: T) -> None:
         """
         set value for the specified key
 
         Args:
             key(ContextKey[T]): context key name
             value(T): context value associated with the specified key
-            strict(bool, optional): check if key already exists (Default value = True)
 
         Raises:
             KeyError: in case if the specified context variable already exists
             ValueError: in case if type of value is not an instance of specified return type
         """
-        has_key = key.key in self._content
-        if strict and has_key:
+        if key.key in self._content:
             raise KeyError(key.key)
         if not isinstance(value, key.return_type):
             raise ValueError(f"Value {value} is not an instance of {key.return_type}")
-        if not has_key:
-            self._content[key.key] = value
+        self._content[key.key] = value
 
     def __iter__(self) -> Iterator[str]:
         """

src/ahriman/core/repository/repository.py

@@ -22,7 +22,7 @@ from __future__ import annotations
 from pathlib import Path
 from typing import Dict, Iterable, List, Optional, Type
 
-from ahriman.core import context
+from ahriman.core import _Context, context
 from ahriman.core.alpm.pacman import Pacman
 from ahriman.core.configuration import Configuration
 from ahriman.core.database import SQLite
@@ -79,16 +79,23 @@ class Repository(Executor, UpdateHandler):
 
     def _set_context(self) -> None:
         """
-        set context variables
+        create context variables and set their values
         """
-        ctx = context.get()
+        # there is a reason why do we always create fresh context here.
+        # Issue is that if we are going to spawn child process (e.g. from web service), we will use context variables
+        # from parent process which we would like to avoid (at least they can have different flags).
+        # In the another hand, this class is the entry point of the application, so we will always create context
+        # exactly on the start of the application.
+        # And, finally, context still provides default not-initialized value, in case if someone would like to use it
+        # directly without loader
+        ctx = _Context()
 
-        ctx.set(ContextKey("database", SQLite), self.database, strict=False)
-        ctx.set(ContextKey("configuration", Configuration), self.configuration, strict=False)
-        ctx.set(ContextKey("pacman", Pacman), self.pacman, strict=False)
-        ctx.set(ContextKey("sign", GPG), self.sign, strict=False)
+        ctx.set(ContextKey("database", SQLite), self.database)
+        ctx.set(ContextKey("configuration", Configuration), self.configuration)
+        ctx.set(ContextKey("pacman", Pacman), self.pacman)
+        ctx.set(ContextKey("sign", GPG), self.sign)
 
-        ctx.set(ContextKey("repository", type(self)), self, strict=False)
+        ctx.set(ContextKey("repository", type(self)), self)
 
         context.set(ctx)