1 files changed, 152 insertions, 0 deletions
diff --git a/src/hydrilla/proxy/state_impl/prune_packages.py b/src/hydrilla/proxy/state_impl/prune_packages.py
new file mode 100644
index 0000000..1857188
--- /dev/null
+++ b/src/hydrilla/proxy/state_impl/prune_packages.py
@@ -0,0 +1,152 @@
+# 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 this code
+# in a proprietary program, I am not going to enforce this in court.
+
+"""
+....
+"""
+
+# Enable using with Python 3.7.
+from __future__ import annotations
+
+import sqlite3
+
+
+_remove_mapping_versions_sql = '''
+WITH removed_mappings AS (
+        SELECT
+                iv.item_version_id
+        FROM
+                          item_versions     AS iv
+                JOIN      items             AS i
+                        USING (item_id)
+                JOIN      orphan_iterations AS oi
+                        USING (repo_iteration_id)
+                LEFT JOIN payloads          AS p
+                        ON p.mapping_item_id = iv.item_version_id
+        WHERE
+                i.type = 'M' AND p.payload_id IS NULL
+)
+DELETE FROM
+        item_versions
+WHERE
+        item_version_id IN removed_mappings;
+'''
+
+_remove_resource_versions_sql = '''
+WITH removed_resources AS (
+        SELECT
+                iv.item_version_id
+        FROM
+                          item_versions               AS iv
+                JOIN      items                       AS i
+                        USING (item_id)
+                JOIN      orphan_iterations           AS oi
+                        USING (repo_iteration_id)
+                LEFT JOIN resolved_depended_resources AS rdr
+                        ON rdr.resource_item_id = iv.item_version_id
+        WHERE
+                rdr.payload_id IS NULL
+)
+DELETE FROM
+        item_versions
+WHERE
+        item_version_id IN removed_resources;
+'''
+
+_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;
+'''
+
+_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
+)
+DELETE FROM
+        repos
+WHERE
+        repo_id IN removed_repos;
+'''
+
+def prune(cursor: sqlite3.Cursor) -> None:
+    """...."""
+    cursor.execute(_remove_mapping_versions_sql)
+    cursor.execute(_remove_resource_versions_sql)
+    cursor.execute(_remove_items_sql)
+    cursor.execute(_remove_files_sql)
+    cursor.execute(_remove_repo_iterations_sql)
+    cursor.execute(_remove_repos_sql)