LP#1715503: make upgrade script abort if not running min support version

This patch causes the monolithic upgrade script to fail if the
database its connecting to isn't running at least Pg 9.4.

To test
-------
[1] Verify that 2.12.5-3.0-beta1-upgrade-db.sql will abort
    if used in a Pg database < 9.4; verify that it will work
    if the Pg version is at least 9.4

Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>
Signed-off-by: Mike Rylander <mrylander@gmail.com>

diff --git a/Open-ILS/src/sql/Pg/version-upgrade/2.12.5-3.0-beta1-upgrade-db.sql b/Open-ILS/src/sql/Pg/version-upgrade/2.12.5-3.0-beta1-upgrade-db.sql
index d10e316..e8e585b 100644 (file)
--- a/Open-ILS/src/sql/Pg/version-upgrade/2.12.5-3.0-beta1-upgrade-db.sql
+++ b/Open-ILS/src/sql/Pg/version-upgrade/2.12.5-3.0-beta1-upgrade-db.sql
@@ -1,5 +1,23 @@
 --Upgrade Script for 2.12.5 to 3.0-beta1
 \set eg_version '''3.0-beta1'''
+
+-- verify that we're running a recent enough version of Pg
+\set ON_ERROR_STOP on
+BEGIN;
+
+DO $$
+   DECLARE ver INTEGER;
+   BEGIN
+      SELECT current_setting('server_version_num') INTO ver;
+      IF (ver < 90400) THEN
+         RAISE EXCEPTION 'Not running a new enough version of PostgreSQL. Minimum required is 9.4; you have %', ver;
+      END IF;
+   END;
+$$;
+
+COMMIT;
+\set ON_ERROR_STOP off
+
 BEGIN;
 INSERT INTO config.upgrade_log (version, applied_to) VALUES ('3.0-beta1', :eg_version);