#!/bin/sh

# Copyright (C) 2020-2025 Internet Systems Consortium, Inc. ("ISC")
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

# Exit with error if commands exit with non-zero and if undefined variables are
# used.
set -eu

# shellcheck disable=SC2034
# SC2034: ... appears unused. Verify use (or export if used externally).
prefix="@prefix@"

# Include utilities based on location of this script. Check for sources first,
# so that the unexpected situations with weird paths fall on the default
# case of installed.
script_path=$(cd "$(dirname "${0}")" && pwd)
if test "${script_path}" = "@abs_top_builddir@/src/share/database/scripts/pgsql"; then
    # shellcheck source=./src/bin/admin/admin-utils.sh.in
    . "@abs_top_builddir@/src/bin/admin/admin-utils.sh"
else
    # shellcheck source=./src/bin/admin/admin-utils.sh.in
    . "@datarootdir@/@PACKAGE_NAME@/scripts/admin-utils.sh"
fi

VERSION=$(pgsql_version "$@")

if [ "$VERSION" != "6.1" ]; then
    printf 'This script upgrades 6.1 to 6.2. '
    printf 'Reported version is %s. Skipping upgrade.\n' "${VERSION}"
    exit 0
fi

psql "$@" >/dev/null <<EOF

START TRANSACTION;

-- This line starts the schema upgrade to version 6.2.

-- Starting from this version we allow specifying multiple IP reservations
-- for the same address in certain DHCP configurations. The server may check
-- uniqueness of the IP addresses on its own. This is no longer checked at
-- the database level to facilitate the use cases when a single host may
-- get the same reserved IP address via different interfaces.

-- Replace the unique index with non-unique index so the queries for
-- hosts by IPv4 address are still efficient.
--
-- Note we have introduced a bug a while ago which causes the index to have
-- different names depending on whether the schema was created via the
-- dhcpdb_create.pgsql script or via updates. Therefore, let's make sure
-- that we drop the index regardless of its current name.
DROP INDEX IF EXISTS key_dhcp4_ipv4_address_subnet_id;
DROP INDEX IF EXISTS hosts_dhcp4_ipv4_address_subnet_id;
CREATE INDEX key_dhcp4_ipv4_address_subnet_id
    ON hosts (ipv4_address ASC, dhcp4_subnet_id ASC);

-- Replace the unique index with non-unique index so the queries for
-- hosts by IPv6 address are still efficient.
ALTER TABLE ipv6_reservations DROP CONSTRAINT IF EXISTS key_dhcp6_address_prefix_len;
CREATE INDEX key_dhcp6_address_prefix_len
    ON ipv6_reservations (address ASC, prefix_len ASC);

-- Update the schema version number.
UPDATE schema_version
    SET version = '6', minor = '2';

-- This line concludes the schema upgrade to version 6.2.

-- Commit the script transaction.
COMMIT;

EOF
