chroot: break up into subclasses

chroot/device.py

@@ -0,0 +1,45 @@
+import atexit
+import os
+
+from constants import Arch, BASE_PACKAGES
+from utils import check_findmnt
+
+from .base import BaseChroot
+from .build import BuildChroot
+from .abstract import get_chroot, Chroot
+
+
+class DeviceChroot(BuildChroot):
+
+    copy_base: bool = False
+
+    def create_rootfs(self, reset, pacman_conf_target, active_previously):
+        clss = BuildChroot if self.copy_base else BaseChroot
+
+        clss.create_rootfs(self, reset, pacman_conf_target, active_previously)
+
+    def mount_rootfs(self, source_path: str, fs_type: str = None, options: list[str] = [], allow_overlay: bool = False):
+        if self.active:
+            raise Exception(f'{self.name}: Chroot is marked as active, not mounting a rootfs over it.')
+        if not os.path.exists(source_path):
+            raise Exception('Source does not exist')
+        if not allow_overlay:
+            really_active = []
+            for mnt in self.active_mounts:
+                if check_findmnt(self.get_path(mnt)):
+                    really_active.append(mnt)
+            if really_active:
+                raise Exception(f'{self.name}: Chroot has submounts active: {really_active}')
+            if os.path.ismount(self.path):
+                raise Exception(f'{self.name}: There is already something mounted at {self.path}, not mounting over it.')
+            if os.path.exists(os.path.join(self.path, 'usr/bin')):
+                raise Exception(f'{self.name}: {self.path}/usr/bin exists, not mounting over existing rootfs.')
+        os.makedirs(self.path, exist_ok=True)
+        atexit.register(self.deactivate)
+        self.mount(source_path, '/', fs_type=fs_type, options=options)
+
+
+def get_device_chroot(device: str, flavour: str, arch: Arch, packages: list[str] = BASE_PACKAGES, extra_repos={}, **kwargs) -> Chroot:
+    name = f'rootfs_{device}-{flavour}'
+    default = DeviceChroot(name, arch, initialize=False, copy_base=False, base_packages=packages, extra_repos=extra_repos)
+    return get_chroot(name, **kwargs, default=default)