try to refactor some boot device code in preparation for imsm

po/POTFILES.in

@@ -33,6 +33,7 @@ subiquity/common/api/tests/test_endtoend.py
 subiquity/common/api/tests/test_server.py
 subiquity/common/errorreport.py
 subiquity/common/filesystem/actions.py
+subiquity/common/filesystem/boot.py
 subiquity/common/filesystem/__init__.py
 subiquity/common/filesystem/labels.py
 subiquity/common/filesystem/manipulator.py
@@ -106,6 +107,7 @@ subiquity/__main__.py
 subiquity/models/filesystem.py
 subiquity/models/identity.py
 subiquity/models/__init__.py
+subiquity/models/kernel.py
 subiquity/models/keyboard.py
 subiquity/models/locale.py
 subiquity/models/mirror.py
@@ -126,6 +128,7 @@ subiquity/server/controllers/filesystem.py
 subiquity/server/controllers/identity.py
 subiquity/server/controllers/__init__.py
 subiquity/server/controllers/install.py
+subiquity/server/controllers/kernel.py
 subiquity/server/controllers/keyboard.py
 subiquity/server/controllers/locale.py
 subiquity/server/controllers/mirror.py

subiquity/common/filesystem/actions.py

@@ -18,7 +18,7 @@ import functools
 
 from subiquitycore.gettext38 import pgettext
 
-from subiquity.common.filesystem import labels
+from subiquity.common.filesystem import boot, labels
 from subiquity.models.filesystem import (
     Bootloader,
     Disk,
@@ -341,12 +341,12 @@ _can_toggle_boot = make_checker(DeviceAction.TOGGLE_BOOT)
 
 @_can_toggle_boot.register(Disk)
 def _can_toggle_boot_disk(disk):
-    if disk._is_boot_device():
+    if boot.is_boot_device(disk):
-        for disk2 in disk._m.all_disks():
+        for disk2 in boot.all_boot_devices(disk._m):
-            if disk2 is not disk and disk2._is_boot_device():
+            if disk2 is not disk:
                 return True
         return False
     elif disk._fs is not None or disk._constructed_device is not None:
         return False
     else:
-        return disk._can_be_boot_disk()
+        return boot.can_be_boot_device(disk)

subiquity/common/filesystem/boot.py

@@ -0,0 +1,70 @@
+# Copyright 2021 Canonical, Ltd.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import functools
+
+from subiquity.models.filesystem import (
+    Disk,
+    Bootloader,
+    )
+
+
+@functools.singledispatch
+def is_boot_device(device):
+    """Is `device` a boot device?"""
+    return False
+
+
+@is_boot_device.register(Disk)
+def _is_boot_device_disk(disk):
+    bl = disk._m.bootloader
+    if bl == Bootloader.NONE:
+        return False
+    elif bl == Bootloader.BIOS:
+        return disk.grub_device
+    elif bl in [Bootloader.PREP, Bootloader.UEFI]:
+        return any(p.grub_device for p in disk._partitions)
+
+
+@functools.singledispatch
+def can_be_boot_device(device, *, with_reformatting=False):
+    """Can `device` be made into a boot device?
+
+    If with_reformatting=True, return true if the device can be made
+    into a boot device after reformatting.
+    """
+    return False
+
+
+@can_be_boot_device.register(Disk)
+def _can_be_boot_device_disk(disk, *, with_reformatting=False):
+    bl = disk._m.bootloader
+    if disk._has_preexisting_partition() and not with_reformatting:
+        if bl == Bootloader.BIOS:
+            if disk.ptable == "msdos":
+                return True
+            else:
+                return disk._partitions[0].flag == "bios_grub"
+        elif bl == Bootloader.UEFI:
+            return any(p.is_esp for p in disk._partitions)
+        elif bl == Bootloader.PREP:
+            return any(p.flag == "prep" for p in disk._partitions)
+    else:
+        return True
+
+
+def all_boot_devices(model):
+    """Return all current boot devices for `model`."""
+    return [disk for disk in model.all_disks() if is_boot_device(disk)]

subiquity/common/filesystem/manipulator.py

@@ -15,9 +15,7 @@
 
 import logging
 
-from subiquity.common.filesystem.actions import (
+from subiquity.common.filesystem import boot
-    DeviceAction,
-    )
 from subiquity.common.types import Bootloader
 from subiquity.models.filesystem import (
     align_up,
@@ -40,8 +38,7 @@ class FilesystemManipulator:
         mount = self.model.add_mount(fs, spec['mount'])
         if self.model.needs_bootloader_partition():
             vol = fs.volume
-            if vol.type == "partition" and vol.device.type == "disk":
+            if vol.type == "partition" and boot.can_be_boot_device(vol.device):
-                if vol.device._can_be_boot_disk():
                 self.add_boot_disk(vol.device)
         return mount
 
@@ -216,7 +213,7 @@ class FilesystemManipulator:
 
         needs_boot = self.model.needs_bootloader_partition()
         log.debug('model needs a bootloader partition? {}'.format(needs_boot))
-        can_be_boot = DeviceAction.TOGGLE_BOOT in DeviceAction.supported(disk)
+        can_be_boot = boot.can_be_boot_device(disk)
         if needs_boot and len(disk.partitions()) == 0 and can_be_boot:
             part = self._create_boot_partition(disk)
 
@@ -338,8 +335,7 @@ class FilesystemManipulator:
     def add_boot_disk(self, new_boot_disk):
         bootloader = self.model.bootloader
         if not self.supports_resilient_boot:
-            for disk in self.model.all_disks():
+            for disk in boot.all_boot_devices(self.model):
-                if disk._is_boot_device():
                 self.remove_boot_disk(disk)
         if new_boot_disk._has_preexisting_partition():
             if bootloader == Bootloader.BIOS:

subiquity/models/filesystem.py

@@ -615,30 +615,6 @@ class Disk(_Device):
     def dasd(self):
         return self._m._one(type='dasd', device_id=self.device_id)
 
-    def _can_be_boot_disk(self):
-        bl = self._m.bootloader
-        if self._has_preexisting_partition():
-            if bl == Bootloader.BIOS:
-                if self.ptable == "msdos":
-                    return True
-                else:
-                    return self._partitions[0].flag == "bios_grub"
-            elif bl == Bootloader.UEFI:
-                return any(p.is_esp for p in self._partitions)
-            elif bl == Bootloader.PREP:
-                return any(p.flag == "prep" for p in self._partitions)
-        else:
-            return True
-
-    def _is_boot_device(self):
-        bl = self._m.bootloader
-        if bl == Bootloader.NONE:
-            return False
-        elif bl == Bootloader.BIOS:
-            return self.grub_device
-        elif bl in [Bootloader.PREP, Bootloader.UEFI]:
-            return any(p.grub_device for p in self._partitions)
-
     @property
     def ok_for_raid(self):
         if self._fs is not None:

subiquity/server/controllers/filesystem.py

@@ -40,7 +40,7 @@ from subiquity.common.errorreport import ErrorReportKind
 from subiquity.common.filesystem.actions import (
     DeviceAction,
     )
-from subiquity.common.filesystem import labels
+from subiquity.common.filesystem import boot, labels
 from subiquity.common.filesystem.manipulator import FilesystemManipulator
 from subiquity.common.types import (
     Bootloader,
@@ -226,8 +226,9 @@ class FilesystemController(SubiquityController, FilesystemManipulator):
             status=ProbeStatus.DONE,
             error_report=self.full_probe_error(),
             disks=[
-                labels.for_client(d, min_size=min_size)
+                labels.for_client(device, min_size=min_size)
-                for d in self.model._all(type='disk')
+                for device in self.model._actions
+                if boot.can_be_boot_device(device, with_reformatting=True)
             ])
 
     async def guided_POST(self, choice: Optional[GuidedChoice]) \

subiquity/ui/views/filesystem/filesystem.py

@@ -63,7 +63,7 @@ from subiquitycore.view import BaseView
 from subiquity.common.filesystem.actions import (
     DeviceAction,
     )
-from subiquity.common.filesystem import labels
+from subiquity.common.filesystem import boot, labels
 from subiquity.models.filesystem import (
     humanize_size,
     )
@@ -286,7 +286,7 @@ class DeviceList(WidgetWrap):
         self.parent.refresh_model_inputs()
 
     def _disk_TOGGLE_BOOT(self, disk):
-        if disk._is_boot_device():
+        if boot.is_boot_device(disk):
             self.parent.controller.remove_boot_disk(disk)
         else:
             self.parent.controller.add_boot_disk(disk)
@@ -329,12 +329,11 @@ class DeviceList(WidgetWrap):
             ptype=device.ptable_for_new_partition().upper())
 
     def _label_TOGGLE_BOOT(self, action, device):
-        if device._is_boot_device():
+        if boot.is_boot_device(device):
             return _("Stop Using As Boot Device")
         else:
             if self.parent.controller.supports_resilient_boot:
-                for other in self.parent.model.all_disks():
+                if boot.all_boot_devices(self.parent.model):
-                    if other._is_boot_device():
                     return _("Add As Another Boot Device")
             return _("Use As Boot Device")