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snapshot: Check that / is a btrfs subvolume before setup

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Skip setup the snapshots app if the filesystem type is btrfs
but / is not a btrfs subvolume. For example, this may happen in
containers where / is a bind mounted btrfs filesystem.

Closes #1994

Tests performed:
- Install freedombox on a lxc container inside Pioneer-FreedomBox.
(In a container, / is a bind mounted btrfs filesystem). The snapshot app
setup is skipped.
- Install freedombox inside dev container (which uses btrfs filesystem
image). The snapshot app setup succeeds.
- Install freedombox inside container that uses a host directory as a base
and the filesystem is ext4. The snapshot app setup is skipped.

Signed-off-by: Veiko Aasa <veiko17@disroot.org>
[sunil: Add comment explaining the check, fix a flake8 message]
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>
This commit is contained in:
Veiko Aasa 2020-12-13 12:15:59 +02:00 committed by Sunil Mohan Adapa
parent 8a7a4a97d1
commit b447627ec8
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1 changed files with 6 additions and 1 deletions
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7
plinth/modules/snapshot/__init__.py
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@ -4,6 +4,7 @@ FreedomBox app to manage filesystem snapshots.
"""
import json
import pathlib
import augeas
from django.utils.translation import ugettext_lazy as _
@ -64,7 +65,11 @@ class SnapshotApp(app_module.App):
def is_supported():
"""Return whether snapshots are support on current setup."""
fs_type = storage.get_filesystem_type()
return fs_type in fs_types_supported
# Check that / is not a bind mounted btrfs filesystem similar to how
# snapper does the check: https://github.com/openSUSE/snapper/blob/
# 77eb6565d3d8df95a06cd52ce31174d98994939c/snapper/BtrfsUtils.cc#L61
root_inode_number = pathlib.Path('/').stat().st_ino
return fs_type in fs_types_supported and root_inode_number == 256
def setup(helper, old_version=None):