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# SPDX-License-Identifier: GPL-3.0-or-later
# Haketilo proxy data and configuration (removal of packages that are not used).
#
# This file is part of Hydrilla&Haketilo.
#
# Copyright (C) 2022 Wojtek Kosior
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
#
# I, Wojtek Kosior, thereby promise not to sue for violation of this
# file's license. Although I request that you do not make use of this
# code in a proprietary program, I am not going to enforce this in
# court.
"""
....
"""
import sqlite3
from pathlib import Path
def _remove_item_versions(cursor: sqlite3.Cursor, with_installed: bool) -> None:
cursor.execute(
'''
CREATE TEMPORARY TABLE __removed_versions(
item_version_id INTEGER PRIMARY KEY
);
'''
)
condition = "iv.active != 'R'" if with_installed else "iv.installed != 'I'"
cursor.execute(
f'''
INSERT INTO
__removed_versions
SELECT
iv.item_version_id
FROM
item_versions AS iv
JOIN orphan_iterations AS oi USING (repo_iteration_id)
WHERE
{condition};
'''
)
cursor.execute(
'''
UPDATE
mapping_statuses
SET
active_version_id = NULL
WHERE
active_version_id IN __removed_versions;
'''
)
cursor.execute(
'''
DELETE FROM
item_versions
WHERE
item_version_id IN __removed_versions;
'''
)
cursor.execute('DROP TABLE __removed_versions;')
_remove_items_sql = '''
WITH removed_items AS (
SELECT
i.item_id
FROM
items AS i
LEFT JOIN item_versions AS iv USING (item_id)
LEFT JOIN mapping_statuses AS ms USING (item_id)
WHERE
iv.item_version_id IS NULL AND
(i.type = 'R' OR ms.enabled = 'N')
)
DELETE FROM
items
WHERE
item_id IN removed_items;
'''
_remove_files_sql = '''
WITH removed_files AS (
SELECT
f.file_id
FROM
files AS f
LEFT JOIN file_uses AS fu USING (file_id)
WHERE
fu.file_use_id IS NULL
)
DELETE FROM
files
WHERE
file_id IN removed_files;
'''
_forget_files_data_sql = '''
WITH forgotten_files AS (
SELECT
f.file_id
FROM
files AS f
JOIN file_uses AS fu
USING (file_id)
LEFT JOIN item_versions AS iv
ON (fu.item_version_id = iv.item_version_id AND
iv.installed = 'I')
GROUP BY
f.file_id
HAVING
COUNT(iv.item_version_id) = 0
)
UPDATE
files
SET
data = NULL
WHERE
file_id IN forgotten_files;
'''
_remove_repo_iterations_sql = '''
WITH removed_iterations AS (
SELECT
oi.repo_iteration_id
FROM
orphan_iterations AS oi
LEFT JOIN item_versions AS iv USING (repo_iteration_id)
WHERE
iv.item_version_id IS NULL
)
DELETE FROM
repo_iterations
WHERE
repo_iteration_id IN removed_iterations;
'''
_remove_repos_sql = '''
WITH removed_repos AS (
SELECT
r.repo_id
FROM
repos AS r
LEFT JOIN repo_iterations AS ri USING (repo_id)
WHERE
r.deleted AND ri.repo_iteration_id IS NULL AND r.repo_id != 1
)
DELETE FROM
repos
WHERE
repo_id IN removed_repos;
'''
def prune_orphans(cursor: sqlite3.Cursor, aggressive: bool = False) -> None:
assert cursor.connection.in_transaction
_remove_item_versions(cursor, with_installed=aggressive)
cursor.execute(_remove_items_sql)
cursor.execute(_remove_files_sql)
cursor.execute(_forget_files_data_sql)
cursor.execute(_remove_repo_iterations_sql)
cursor.execute(_remove_repos_sql)
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