Begin Firecracker microVM support

config/apps.py

@@ -0,0 +1,14 @@
+from django.apps import AppConfig
+
+
+class TussilagoConfig(AppConfig):
+    """Application config used to register startup hooks for config package."""
+
+    # TODO(TheLovinator): Consider creating an app with a more descriptive name for its purpose, e.g. "core" or "common".  # noqa: TD003
+
+    name = "config"
+    verbose_name = "Tussilago Config"
+
+    def ready(self) -> None:
+        """Register Django system checks after app loading."""
+        import config.checks  # pyright: ignore[reportUnusedImport]  # noqa: F401, PLC0415

config/checks.py

@@ -0,0 +1,59 @@
+from __future__ import annotations
+
+import shutil
+from typing import TYPE_CHECKING
+
+from django.conf import settings
+from django.core.checks import Tags
+from django.core.checks import Warning as DjangoWarning
+from django.core.checks import register
+
+if TYPE_CHECKING:
+    from django.core.checks import CheckMessage
+
+REQUIRED_DEV_COMMANDS: tuple[str, ...] = (
+    "uname",
+    "curl",
+    "basename",
+    "grep",
+    "sort",
+    "tail",
+    "wget",
+    "unsquashfs",
+    "ssh-keygen",
+    "sudo",
+    "chown",
+    "truncate",
+    "mkfs.ext4",
+    "e2fsck",
+)
+
+
+@register(Tags.compatibility)
+def check_required_dev_commands(*_: object, **__: object) -> list[CheckMessage]:
+    """Warn in dev-like runtime when host tooling for init script is missing.
+
+    Returns:
+        A list of CheckMessage objects representing any issues found.
+    """
+    if not (settings.DEBUG or getattr(settings, "TESTING", False)):
+        return []
+
+    missing_commands: list[str] = [
+        command for command in REQUIRED_DEV_COMMANDS if shutil.which(command) is None
+    ]
+
+    if not missing_commands:
+        return []
+
+    return [
+        DjangoWarning(
+            "Missing host commands used by get_rootfs.bash.",
+            hint=(
+                "Dev-only tooling missing: "
+                f"{', '.join(missing_commands)}. "
+                "These are required for local VM/rootfs setup during development, not production runtime."
+            ),
+            id="tussilago.W001",
+        ),
+    ]

config/settings.py

@@ -69,6 +69,7 @@ if DEBUG:
     INTERNAL_IPS: list[str] = ["127.0.0.1", "localhost"]
 
 INSTALLED_APPS: list[str] = [
+    "config.apps.TussilagoConfig",
     "django.contrib.admin",
     "django.contrib.auth",
     "django.contrib.contenttypes",