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[nominatim.git] / nominatim / version.py

diff --git a/nominatim/version.py b/nominatim/version.py
index e7f31a12b5ab4dcebcfed07e9a32effdb1e716c4..95420b341f33f6c8dd3a2a95efd20b06ec785b29 100644 (file)
--- a/nominatim/version.py
+++ b/nominatim/version.py
@@ -1,16 +1,56 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# This file is part of Nominatim. (https://nominatim.org)
+#
+# Copyright (C) 2023 by the Nominatim developer community.
+# For a full list of authors see the git log.
 """
 Version information for Nominatim.
 """
+from typing import Optional, NamedTuple
 
-# Version information: major, minor, patch level, database patch level
-#
-# The first three numbers refer to the last released version.
-#
-# The database patch level tracks important changes between releases
-# and must always be increased when there is a change to the database or code
-# that requires a migration.
-# Released versions always have a database patch level of 0.
-NOMINATIM_VERSION = (3, 6, 0, 0)
+class NominatimVersion(NamedTuple):
+    """ Version information for Nominatim. We follow semantic versioning.
+
+        Major, minor and patch_level refer to the last released version.
+        The database patch level tracks important changes between releases
+        and must always be increased when there is a change to the database or code
+        that requires a migration.
+
+        When adding a migration on the development branch, raise the patch level
+        to 99 to make sure that the migration is applied when updating from a
+        patch release to the next minor version. Patch releases usually shouldn't
+        have migrations in them. When they are needed, then make sure that the
+        migration can be reapplied and set the migration version to the appropriate
+        patch level when cherry-picking the commit with the migration.
+    """
+
+    major: int
+    minor: int
+    patch_level: int
+    db_patch_level: int
 
-POSTGRESQL_REQUIRED_VERSION = (9, 3)
+    def __str__(self) -> str:
+        return f"{self.major}.{self.minor}.{self.patch_level}-{self.db_patch_level}"
+
+
+NOMINATIM_VERSION = NominatimVersion(4, 3, 0, 0)
+
+POSTGRESQL_REQUIRED_VERSION = (9, 6)
 POSTGIS_REQUIRED_VERSION = (2, 2)
+
+# Cmake sets a variable @GIT_HASH@ by executing 'git --log'. It is not run
+# on every execution of 'make'.
+# cmake/tool-installed.tmpl is used to build the binary 'nominatim'. Inside
+# there is a call to set the variable value below.
+GIT_COMMIT_HASH : Optional[str] = None
+
+
+def parse_version(version: str) -> NominatimVersion:
+    """ Parse a version string into a version consisting of a tuple of
+        four ints: major, minor, patch level, database patch level
+
+        This is the reverse operation of `version_str()`.
+    """
+    parts = version.split('.')
+    return NominatimVersion(*[int(x) for x in parts[:2] + parts[2].split('-')])