storage: Make external disk mounts accessible by other users

- samba app doesn't need anymore to change mount permissions

Fixes #1692 (in a different way)

Signed-off-by: Veiko Aasa <veiko17@disroot.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

actions/samba

@@ -24,7 +24,6 @@ import configparser
 import json
 import os
 import shutil
-import stat
 import subprocess
 
 SHARES_CONF_BACKUP_FILE = '/var/lib/plinth/backups-data/samba-shares-dump.conf'
@@ -120,8 +119,6 @@ def _create_share(mount_point, share_type, windows_filesystem=False):
     share_path = os.path.join(mount_point, shares_path, subdir)
     os.makedirs(share_path, exist_ok=True)
 
-    _make_mounts_readable_by_others(mount_point)
-
     # FAT and NTFS partitions don't support setting permissions
     if not windows_filesystem:
         if share_type in ['open', 'group']:
@@ -235,13 +232,6 @@ def _get_shares_path(mount_point):
     return 'FreedomBox/shares/'
 
 
-def _make_mounts_readable_by_others(mount_point):
-    """Make mounted devices readable/traversible by others."""
-    dirname = os.path.dirname(mount_point)
-    stats = os.stat(dirname)
-    os.chmod(dirname, stats.st_mode | stat.S_IROTH | stat.S_IXOTH)
-
-
 def _set_open_share_permissions(directory):
     """Set file and directory permissions for open share."""
     shutil.chown(directory, group='freedombox-share')

actions/storage

@@ -23,6 +23,7 @@ import argparse
 import json
 import os
 import re
+import stat
 import subprocess
 import sys
 
@@ -34,6 +35,8 @@ def parse_arguments():
     parser = argparse.ArgumentParser()
     subparsers = parser.add_subparsers(dest='subcommand', help='Sub command')
 
+    subparsers.add_parser('setup', help='Configure storage after install')
+
     subparser = subparsers.add_parser(
         'is-partition-expandable',
         help='Return whether a given partition can be expanded')
@@ -320,6 +323,20 @@ def umount_all_filesystems_of_drive(drive_object_path):
         umount_filesystem(obj.get_filesystem())
 
 
+def subcommand_setup(_):
+    """Configure storage."""
+    # create udisks2 default mount directory
+    mounts_directory = '/media/root'
+    try:
+        os.mkdir(mounts_directory)
+    except FileExistsError:
+        pass
+
+    # make the directory readable and traversible by other users
+    stats = os.stat(mounts_directory)
+    os.chmod(mounts_directory, stats.st_mode | stat.S_IROTH | stat.S_IXOTH)
+
+
 def subcommand_usage_info(_):
     """Get information about disk space usage."""
     command = [

plinth/modules/storage/__init__.py

@@ -32,7 +32,7 @@ from plinth.utils import format_lazy, import_from_gi
 
 from .manifest import backup  # noqa, pylint: disable=unused-import
 
-version = 3
+version = 4
 
 name = _('Storage')
 
@@ -277,6 +277,7 @@ def get_error_message(error):
 def setup(helper, old_version=None):
     """Install and configure the module."""
     helper.install(managed_packages, skip_recommends=True)
+    helper.call('post', actions.superuser_run, 'storage', ['setup'])
     helper.call('post', app.enable)
     disks = get_disks()
     root_device = get_root_device(disks)